JP2006174953A - Fall prevention device, freight vehicle, and method of assembling fall prevention device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a fall prevention device which has a light weight and easy to handle and increases workability and safety on a bed. <P>SOLUTION: Support posts 10A, 10B are vertically provided on a flap 2 of the cargo bed 1 of a freight vehicle 600 as a truck. Each support post 10A, 10B has a base part 50 fixed to the flap 2 by being tightened across the end edges of the gate 2 by a clamp structure and a columnar part 40 detachably supported by the base part 50. Ropes 30, 31 are put between the support posts 10A, 10B. A net 20 is spread between two ropes 30, 31. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fall prevention device for preventing a person from falling from a loading platform of a cargo vehicle, a cargo vehicle provided with the device, a cargo vehicle enabling the installation of the device, and a method for assembling the fall prevention device. About.

  At a construction site, a material used for construction is carried into the site by a large truck (4 ton car, 10 ton car, trailer car, etc.). Incoming materials include materials used in relatively early stages of construction processes, such as H-shaped steel, reinforcing steel, formwork, and cement, as well as electrical materials, ducts, piping materials, plaster boards, wall cloths, tiles, blocks, It covers a wide range of materials, such as paints, finishing hardware, joinery, lighting, etc., which are required for the medium and late periods, and thus furniture after construction. In other words, large-scale trucks are carried in at the work site over the entire construction period, and sometimes carried out.

  In recent years, with the improvement of the safety level at the field work site, attention has been focused on the necessity of preventing accidents of falling of workers from the truck bed when materials are loaded and unloaded. This kind of fall accident has been greatly reduced as a result of heart and heart poured into the fall of workers from scaffolds and steel frames during construction. Therefore, as we went further and pursued the weaknesses and blind spots of the fall accident, attention has been focused on preventing the fall accident of workers from the truck bed.

  According to Articles 518 to 521 of the Occupational Safety and Health Regulations, when working at a place with a height of 2 meters or more, it is necessary to take measures to prevent the workers from falling, such as using a safety belt. Has been. The truck bed is no more than 2 meters above the ground. However, workers often work while standing on a load higher than the truck bed. In this case, even if the worker is at a height of 2 meters or less based on the loading platform or the load, the worker works at a height exceeding 2 meters when the ground is used as a reference. If it falls on the ground, the worker will be appropriately damaged and sometimes life threatened.

  Furthermore, in construction sites such as buildings, the ground is excavated deeply in the early stages of construction work to form the foundation and underground parts, and trucks carrying materials in and out are bridged over the excavated cavities. It is customary to stop on the pier and unload materials. In this case, once the worker falls from the truck bed, the worker may fall to the bottom of a few tens of meters.

  Therefore, conventionally, a master strut (a strut for stroking a safety strap to hang a safety belt) is attached to the highest part of the load on the loading platform, and as the work for lowering the load proceeds, Work was being done to reattach the leash struts one after another. However, this method has a problem that it is not efficient and is not suitable for the actual situation at the work site. In addition, an operator wearing a safety belt can avoid a crash to the ground, etc., when falling from the load, but it receives a concentrated load on the body part wearing the safety belt, and the body receives an impact. There was a problem that it could be a source of aftereffects.

  On the other hand, as a technique for preventing an operator from falling from a truck bed without using a safety belt, for example, Patent Document 1 discloses a detachable fence-like structure that is used by being attached to a luggage rack. Things are disclosed. However, this prior art provides a fence that can be gripped by a cage when an operator working on the loading platform loses the balance of the body, and does not reliably prevent falling from the loading platform. It was. In order to increase the effect of preventing falling, it is necessary to densely arrange the fence-like structure along the outer periphery of the loading platform. Moreover, in order to prevent the fall of the operator who works on the material loaded on the loading platform of a large truck, it is necessary to make a fence-like structure tall. As a result, the total weight of the fence-like structure increases, which is inconvenient to handle.

In addition, with the displacement of the load suspended by a crane or the like, the operator is likely to hit the body against the rigid fence-like structure by being pushed by the load. Furthermore, the operator may be sandwiched between the misaligned load and the fence-like structure, and may be pressed by the heavy load. In addition, since the worker must work in a narrow space surrounded by a fence-like structure as a wall that does not move, the problem is that the freedom of the body is restrained and the workability on the loading platform is bad There was a point.
JP 2004-058949 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a fall prevention technique that is light and easy to handle, and that can improve workability and safety on the loading platform.

  In order to solve the above-mentioned problems and achieve the above-mentioned object, the invention according to claim 1 is a fall prevention device for preventing a person from falling from a cargo bed of a cargo vehicle, and is attached to and detached from an outer peripheral portion of the cargo bed. A plurality of struts standing upright, and a net developed between each of the plurality of struts and a strut adjacent to each strut along the outer periphery.

  According to this structure, the net | network is expand | deployed between the group of the support | pillar standing adjacently along the outer peripheral part of a loading platform, Thereby, the net | network is expand | deployed above the outer peripheral part of a loading platform. For this reason, even if personnel who work on the cargo bed or on the load on the cargo bed lose their footing due to unforeseen circumstances, they can be prevented from falling from the cargo bed by the deployed net. it can. In addition, unlike the case of using a fence with rigidity, the impact of the body being received is small due to the flexibility of the net. Furthermore, even when personnel are pushed against the load, the net flexibly receives the body, reducing the risk of being subjected to pressure. That is, safety is improved.

  In addition, due to the flexibility of the net, personnel can perform work and the like while pushing the net to some extent with a part of the body such as an arm on the bed and on the load on the bed. That is, the freedom of body freedom by the net is loose, and the substantial work space is expanded. As a result, workability on a narrow limited bed is improved. Furthermore, since the restraint of freedom of the body is gentle, the mental pressure of the person who performs work on a narrow carrier is reduced. This also contributes to the improvement of workability.

  Moreover, since the fall prevention apparatus by this structure uses the lightweight member called a net | network as a member which receives the body of a person, it is lightweight also as the whole apparatus. Moreover, since the column can be attached and detached, the fall prevention device can be removed while the cargo vehicle is traveling. Due to its light weight, the fall prevention device can be disassembled and loaded on a cargo vehicle when not in use.

  In addition, since the net can be arbitrarily deployed between struts having a smaller interval than its own length, the same fall prevention device can be installed in various cargo vehicles having different cargo bed sizes. . Therefore, it is necessary to prepare a set of members for the fall prevention device before assembly, that is, an assembly kit for the fall prevention device, at the work site where various types of vehicles enter and load and unload the load. Is also possible.

  In addition, “between each of the plurality of support columns and the support column adjacent to each of the support columns along the outer peripheral portion” is necessarily required to be between all the groups adjacent to each other along the outer peripheral portion. do not do. For example, when the plurality of support columns are four support columns erected at portions corresponding to the four corners of the loading platform, a net is developed between the left and right front and rear sets, and the right and left front and rear The net is only developed between the sets, and the net does not have to be developed between the front left and right set and between the rear left and right set. That is, it is sufficient that a net is developed between each of the plurality of support columns and any of the support columns adjacent along the outer peripheral portion.

  The invention according to claim 2 is the fall prevention device according to claim 1, wherein two or more different heights are provided between each of the plurality of struts and a strut adjacent to each strut along the outer peripheral portion. The rope further spans the rope, and the net is unfolded between the ropes having different heights.

  According to this structure, the net | network is expand | deployed above the outer peripheral part of a cargo bed with the rope spanned between the group of the support | pillar standing adjacent to the outer peripheral part of a cargo bed. For this reason, the operation | work which expand | deploys a net | network between support | pillars can be performed easily. Further, it is possible to easily apply tension to the net as necessary. In addition, since the rope can be arbitrarily routed between struts with a smaller interval than its own length, it is difficult to install the same fall prevention device on various cargo vehicles having different cargo bed sizes. Absent.

  In this configuration, the “net deployed between the ropes” does not necessarily require that the net is stretched in a tensioned state. For example, it may be gently deployed between the ropes with the net hanging. Further, in the present invention, the `` rope '' is preferably a rope in the normal sense from the viewpoint of strength, flexibility, easy-to-handle thickness, etc., but includes not only ropes or ropes, but also wires and belts, It has the same strength as a rope and a certain degree of flexibility, and is a general term for linear items that can be used in the present invention.

  The invention according to claim 3 is the fall prevention device according to claim 2, wherein each of the plurality of struts has an annular member for attaching the rope to two or more portions having different heights. is there.

  According to this structure, since each support | pillar has the annular member for attaching a rope to two or more site | parts from which height differs, a rope can be easily attached to a support | pillar by attaching a rope to an annular member.

  The invention according to claim 4 is the fall prevention device according to claim 3, wherein the two or more parts are three or more parts having different heights.

  According to this configuration, each strut has an annular member for attaching a rope to three or more parts having different heights. Therefore, the height of the rope can be easily selected by selecting the annular member to which the rope is attached. Can be changed to

  A fifth aspect of the present invention is the fall prevention device according to the third or fourth aspect, wherein each of the ropes is detachably supported by the annular member via a carabiner.

  According to this structure, since each rope is detachably supported by the annular member via the carabiner, the attachment work and the removal work of each rope to the corresponding column are facilitated.

  A sixth aspect of the present invention is the fall prevention device according to any one of the second to fifth aspects, wherein one end of each of the ropes is supported by a corresponding column via a tensioner. .

  According to this structure, since the end of each rope is supported by the corresponding support | pillar via the tensioner, the operation | work which tensions and loosens a rope is facilitated.

  The invention according to claim 7 is the fall prevention device according to any one of claims 2 to 6, wherein the net is detachably attached to the ropes having different heights via a carabiner. is there.

  According to this configuration, since the net is detachably attached to the rope via the carabiner, the work for attaching and removing the net to the rope is facilitated.

  The invention according to claim 8 is the fall prevention device according to any one of claims 2 to 7, wherein the plurality of support columns are erected at portions corresponding to at least four corners of the cargo bed, Is deployed at least on the left and right sides of the loading platform, and among the four struts erected at the portions corresponding to the four corners of the loading platform, the one that is erected at the left front portion and the right front portion. A rope is also stretched between what is erected and between what is erected at the left rear part and what is erected at the right rear part.

  According to this configuration, the ropes are spanned between the struts erected at the portions corresponding to the four corners of the loading platform and the struts adjacent in both directions along the outer periphery. For this reason, when the net receives the personnel's body, the load is distributed to all four columns. That is, since the four struts cooperate to support the load acting on a part of the net, concentration of the load on one strut is reduced. For this reason, safety is further improved.

  A ninth aspect of the present invention is the fall prevention device according to any one of the first to seventh aspects, wherein the plurality of support columns are erected at portions corresponding to at least four corners of the loading platform. .

  According to this configuration, since the plurality of support columns are erected at portions corresponding to the four corners of the loading platform, the net is widened on at least two of the outer circumference of the loading platform, that is, the left side, the right side, the rear side, and the front side. It becomes possible to expand. In the present invention, the “four corners of the loading platform” need only be substantially four corners of the loading platform, and does not need to be the four corners of the loading platform accurately and geometrically.

  A tenth aspect of the present invention is the fall prevention device according to the ninth aspect, wherein the net is developed at least on the left and right sides of the loading platform.

  According to this configuration, since the net is deployed on the left and right sides of the loading platform with the highest risk of falling, a high fall prevention effect can be obtained.

  The invention according to claim 11 is the fall prevention device according to claim 10, wherein the net is also developed behind the cargo bed.

  According to this configuration, since the net is also deployed behind the loading platform, the fall prevention effect is further enhanced.

  A twelfth aspect of the present invention is the fall prevention device according to the tenth or eleventh aspect, wherein the net is also deployed in front of the loading platform.

  According to this configuration, since the net is also deployed in front of the loading platform, the fall prevention effect is further enhanced. When the freight vehicle is a truck, a torii is provided in front of the loading platform, and this torii is expected to contribute to a certain extent to prevent falling. However, since the torii is as rigid as the fence in the prior art, safety can be improved by providing a net in front. Furthermore, when personnel work on the platform at a height exceeding the torii, safety is particularly enhanced by deploying a net in front of the platform.

  A thirteenth aspect of the present invention is the fall prevention device according to any one of the first to twelfth aspects, wherein each of the plurality of support columns is extendable.

  According to this structure, since each support | pillar can be expanded-contracted, the height of a net | network can be adjusted by adjusting the expansion / contraction degree of each support | pillar.

  A fourteenth aspect of the present invention is the fall prevention device according to any one of the first to thirteenth aspects, wherein the plurality of support columns are attached to a floor plate of the cargo bed.

  According to this configuration, since the plurality of support columns are attached to the floor plate of the loading platform, these columns can be erected even for a vehicle having no loading platform.

  A fifteenth aspect of the present invention is the fall prevention device according to the fourteenth aspect, wherein the plurality of support columns are attached to the floor board by inserting lower end portions into holes provided in the floor board. is there.

  According to this configuration, since the plurality of support columns are attached to the floor plate by inserting the lower end portions into the holes provided in the floor plate of the loading platform, the upright operation of the support column is facilitated.

  The invention according to claim 16 is the fall prevention device according to claim 15, wherein each of the plurality of support columns has a protruding portion that abuts against an edge of the hole on a side surface near its lower end. .

  According to this configuration, each support column has the protruding portion that abuts against the edge of the hole on the side surface in the vicinity of the lower end thereof, so that each support column can be easily erected at a predetermined height.

  The invention according to claim 17 is the fall prevention device according to any one of claims 1 to 13, wherein the plurality of support columns are attached to a ridge of the cargo bed.

  According to this configuration, since the plurality of support columns are attached to the luggage rack, it is possible to secure a wide floor area of the luggage bed on which the load can be loaded.

  The invention according to claim 18 is the fall prevention device according to claim 17, wherein each of the plurality of support columns is detachably attached to the saddle, and a lower end is detachable from the pedestal portion. And a columnar part that is erected on the pedestal part by being attached.

  According to this structure, each support | pillar can be erected by attaching a pedestal part to a collar and then attaching a columnar part to the pedestal part. That is, since each column can be erected step by step, the column erection operation is facilitated.

  The invention according to claim 19 is the fall prevention device according to claim 18, wherein the pedestal portion clamps and clamps one principal surface and the other principal surface of the collar across the edge of the collar. Thus, it has a clamp structure fixed to the ridge.

  According to this configuration, since the pedestal portion has a clamp structure that is fixed to the heel by clamping and sandwiching both main surfaces of the heel over the heel, the pedestal portion can be processed without being processed into the heel. Can be installed on the fence.

  The invention according to claim 20 is the fall prevention device according to claim 19, wherein the clamp structure is a contact member that comes into contact with the end edge, and a screw that advances and retreats toward the one main surface with rotation. A member that is connected to the contact member and is screwed to the screw to support the screw; a pressing member that is connected to the contact member and contacts the other main surface; and the screw A pressing member that is attached to the end of the screw and abuts against the one main surface by advancing the screw and presses the one main surface, thereby tightening the one main surface and the other main surface in cooperation with the pressing member And.

  According to this configuration, the clamp structure is positioned at the edge by the contact member. Further, by rotating the screw, the screw can be advanced to press the pressing member against one main surface of the heel. Thereby, since a press member and a pressing member will clamp both main surfaces of a scissors, a clamp structure is fixed to a scissors. Thus, according to this structure, a base part can be easily attached to a collar by rotating a screw.

  The invention according to claim 21 is the fall prevention device according to claim 20, wherein the pressing member is freely restrained in the rotational direction of the screw and allowed to play in the axial direction of the screw, An engaging member that engages with the screw, and an elastic member that is attached to a side of the engaging member that faces the one main surface.

  According to this configuration, when the screw is rotated, the pressing force is transmitted to the elastic member through the engaging member engaged with the screw, and the elastic member presses one main surface of the heel. For this reason, it is possible to tighten the scissors without damaging the main surface of the scissors. Further, since the engaging member engages with the screw freely in the rotation direction of the screw, the screw can be smoothly rotated. Further, since the rotation of the elastic member accompanying the rotation of the screw is suppressed, the elastic member is hardly worn and the main surface of the ridge is not easily damaged. Further, since the engaging member is restrained while allowing play in the axial direction of the screw, when the screw is rotated in the loosening direction, even after releasing the pressing state of the heel by the pressing member, the screw is retracted. The pressing member does not leave the screw. For this reason, the workability | operativity at the time of attaching or removing a base part is improved. Note that “while allowing play” means that there may or may not be play.

  According to a twenty-second aspect of the present invention, in the fall prevention device according to the twenty-first aspect, a center portion of the tip of the screw protrudes, and a top portion of the protruding portion abuts against a part of the engaging member to press. By doing so, a pressing force is applied to the engaging member.

  According to this configuration, since the tip of the screw protrudes at the center portion, and the top portion of the protruding portion comes into contact with and presses a part of the engaging member, a pressing force is applied to the engaging member. The screw can be rotated more smoothly. Moreover, the rotation of the elastic member accompanying the rotation of the screw can be further suppressed.

  The invention according to claim 23 is the fall prevention device according to claim 21 or 22, wherein the clamp structure restrains the rotation of the engagement member around the axis of the screw, and It further has a guide member that guides it slidably in the axial direction of the screw.

  According to this configuration, since the rotation of the engaging member is restrained by the guide member, the rotation of the elastic member accompanying the rotation of the screw can be reliably restrained.

  The invention according to claim 24 is the fall prevention device according to any one of claims 20 to 23, wherein the clamp structure includes the abutting member, the screw, the screw supporting portion, the pressing member, and the pressing member. A set with a member is provided at a plurality of sites along the edge of the ridge.

  According to this structure, since the several site | part along the edge of a collar is clamp | tightened with a pressing member and a pressing member, a base part is stably fixed to a collar.

  The invention according to claim 25 is the fall prevention device according to any one of claims 19 to 24, wherein the clamp structure is a square member having a cross-sectional dimension of 50 mm x 50 mm along the edge of the flange. In a state where the bulge is held, the ridge can be sandwiched.

  According to this configuration, since the clamp structure has a shape that can hold the ridge in a state of holding a square-shaped bulge having a cross-sectional dimension of 50 mm × 50 mm along the edge of the ridge, the clamp structure is a commercially available track. It becomes possible to deal with almost all the traps.

  The invention according to claim 26 is the fall prevention device according to any one of claims 19 to 25, wherein the pedestal portion is a member connected to the clamp structure or a member constituting a part of the clamp structure. And a cylindrical receiving portion that supports the columnar portion by receiving the insertion of the lower end portion of the columnar portion.

  According to this configuration, the columnar portion can be erected by inserting the lower end portion of the columnar portion into the cylindrical receiving portion as a member constituting the clamp structure or a member constituting a part of the clamp structure. The columnar part is stably supported, and the work of raising the columnar part is facilitated.

  A twenty-seventh aspect of the present invention is the fall prevention device according to the twenty-sixth aspect, wherein the receiving portion has a bottom.

  According to this structure, since the receiving part which should insert the lower end part of a columnar part is bottomed, when raising a columnar part, the depth which should insert a columnar part is decided with a bottom. For this reason, the columnar portion can be raised to a predetermined height by a simple operation.

  The invention according to claim 28 is the fall prevention device according to claim 26 or 27, wherein the member is detachably connected between the pedestal part and the columnar part attached to the pedestal part. A reinforcing member that restrains tilting of the columnar portion around the receiving portion with tension is further provided.

  According to this configuration, since the reinforcing member is provided, the strength against the load that is generated when the net receives the body of the person and that tries to tilt the columnar portion around the receiving portion is increased. Since the reinforcing member is detachable, it does not hinder the incorporation and removal of the columnar part from the pedestal part.

  A twenty-ninth aspect of the present invention is the fall prevention device according to the twenty-sixth or twenty-seventh aspect, wherein the collar and the columnar portion attached to at least one pedestal portion of the plurality of support columns are detachably connected. And a reinforcing member that restrains the tilt of the columnar portion around the receiving portion with tension.

  According to this configuration, since the reinforcing member is provided, the strength against the load that is generated when the net receives the body of the person and that tries to tilt the columnar portion around the receiving portion is increased. Since the reinforcing member is detachable, it does not hinder the incorporation and removal of the columnar part from the pedestal part.

  A thirty-third aspect of the present invention is the fall prevention device according to the twenty-ninth aspect, wherein the pedestal portion of the at least one support column is attached to a side rod, and one end of the reinforcing member is attached to a rear rod. Is.

  According to this configuration, since the columnar portion supported by the pedestal portion attached to the side rod is reinforced by the reinforcing member attached at one end to the rear rod, it occurs when the net receives the body of the person. It is a load, and the intensity | strength with respect to the load which tries to incline a columnar part sideward around a receiving part is raised.

  A thirty-first aspect of the invention is the fall prevention device according to any one of the twenty-eighth to thirty-third aspects, wherein the reinforcing member has a turnbuckle for generating the tension.

  According to this configuration, since the reinforcing member has the turnbuckle, the tension by the reinforcing member can be easily adjusted.

  A thirty-second aspect of the present invention is the fall prevention device according to any one of the twenty-sixth to thirty-first aspects, wherein the columnar portions of the plurality of struts have a protrusion on the side surface near the lower end portion of the column. .

  According to this configuration, since each columnar part has a protrusion on the side surface near the lower end, it is inserted into a mounting hole for a load collapse prevention column provided on the loading platform of the trailer vehicle, and the protrusion is used as an edge of the hole. By abutting, the columnar part can be erected on the loading platform at a predetermined height. Thereby, it becomes possible to divert the columnar part as a column for preventing collapse of the cargo bed of the trailer vehicle. Moreover, each columnar part can also be used as a column of the fall prevention device according to claim 16.

  A thirty-third aspect of the invention is the fall prevention device according to any one of the thirteenth to thirty-second aspects, wherein the pedestal portion stands the columnar portion when the heel is closed upward. It is what makes it possible.

  According to this configuration, since the pedestal portion allows the columnar portion to stand when the heel is closed upward, the column can be erected on the heel closed upward.

  A 34th aspect of the present invention is the fall prevention device according to any one of the 19th to 32nd aspects, wherein the pedestal portion raises the columnar portion when the heel is in a state of hanging downward. Is possible.

  According to this configuration, since the pedestal portion allows the columnar portion to stand when the heel is in a state of hanging downward, it is possible to stand the column on the heel hanging downward. it can. The heel does not open much more than it hangs down. For this reason, the tilting of the columnar part due to the load generated when the net receives the body of the person can be stably regulated by the scissors.

  A thirty-fifth aspect of the present invention is a freight vehicle comprising the fall prevention device according to any one of the first to thirty-fourth aspects.

  According to this configuration, since the cargo vehicle includes the fall prevention device of the present invention, workability and safety on the loading platform can be improved. Moreover, since the fall prevention device is lightweight and easy to handle, it can be easily attached to and detached from the vehicle.

  A thirty-sixth aspect of the invention is a freight vehicle to which the fall prevention device according to any one of the first to thirteenth and seventeenth aspects can be attached, and supports the strut by accepting insertion of a lower end portion of the strut. A cylindrical receiving portion is provided on the luggage ridge.

  According to this configuration, since the freight vehicle has the cylindrical receiving portion that supports the support column of the fall prevention device of the present invention at the foot of the loading platform, the support column can be easily inserted by inserting the support column into the reception unit. Can be erected.

  The invention according to claim 37 is the method of assembling the fall prevention device according to any one of claims 2 to 8, wherein the plurality of struts are detachably erected on the outer periphery of the cargo bed. And by suspending the rope supporting at least both ends of the net at two or more different heights between each of the plurality of columns and the column adjacent to each column along the outer periphery. A net unfolding step for unfolding the net above the outer periphery of the loading platform.

  According to this structure, a support | pillar can be erected on the outer peripheral part of a cargo bed by a support | pillar standing-up process, and a net | network can be expand | deployed above the outer peripheral part of a cargo bed by a net | network expansion | deployment process. That is, the fall prevention device of the present invention can be attached to the cargo bed of the cargo vehicle. In addition, the net can be easily developed by suspending the ropes supporting both ends of the net between the corresponding columns.

As described above, according to the assembling method of the fall prevention device, cargo vehicle, and fall prevention device of the present invention, workability and safety on the loading platform can be improved, and handling properties can also be improved. .

(Overall configuration of the device)
FIG. 1 is a schematic side view of a freight vehicle including a fall prevention device according to an embodiment of the present invention. The cargo vehicle 600 is embodied as a large truck. A fall prevention device 500 is detachably installed on the loading platform 1 of the cargo vehicle 600. The fall prevention device 500 includes a plurality of struts 10, a net 20, and ropes 30 and 31 as main members. The column 10 includes a columnar part 40 and a pedestal part 50. The pedestal portion 50 is detachably attached to the edge of the bag 2 of the loading platform 1 by a clamp mechanism. The columnar part 40 is stood by attaching a lower end part to the base part 50 so that attachment or detachment is possible. Thereby, the column 10 is erected on the outer peripheral portion of the loading platform 1.

  At least two struts 10 are erected. In the following description, an example in which four struts 10 are erected at the four corners of the loading platform 1 will be taken up. In FIG. 1, only a support column 10 (represented by reference numeral 10 </ b> A as necessary) provided on the left front side of the loading platform 1 and a support column 10 (represented by reference numeral 10 </ b> B as necessary) provided on the left rear side are illustrated. . Since the fall prevention device 500 is configured similarly to the left side on the right side of the loading platform 1, only the configuration on the left side will be described as a representative.

  A rope 30 and a rope 31 are stretched between the support 10A and the support 10B. The rope 30 is supported near the lower ends of the columns 10A and 10B, and the rope 31 is supported on the upper ends of the columns 10A and 10B. More specifically, the rope 30 is supported by the pedestal portion 50 along the edge of the rod 2, and the rope 31 is supported by the top of the columnar portion 40. As will be described later, both ends of the ropes 30 and 31 are detachably supported by the columns 10A and 10B via carabiners. Furthermore, one end of the ropes 30 and 31 is supported by the support 10A through a tensioner together with a carabiner. Thereby, both the ropes 30 and 31 are stretched between the support column 10A and the support column 10B in a tension state.

  The net | network 20 is expand | deployed between the support | pillar 10A and the support | pillar 10B by expand | deploying between the rope 30 and the rope 31. FIG. More specifically, the upper end of the net 20 is supported by the rope 31 and the lower end is supported by the rope 30. The rope 31 is provided in order to suspend the net 20, and the rope 30 is provided in order to avoid a gap that allows a person to slip through the net 20 and the rod 2. As will be described later, the net 20 is detachably attached to the ropes 30 and 31 via a carabiner. FIG. 1 shows an example in which the net 20 is deployed between the rope 30 and the rope 31 in a state where the net 20 hangs gently, but may be deployed in a tensioned state as will be described later. For example, the lateral end of the mesh 20 is a string (string) so that the mesh 20 is free to move horizontally along the ropes 30 and 31 so that a large gap is not formed between the mesh 20 and the supports 10A and 10B. ) It is desirable to be connected to the pillars 10A and 10B with 25 or the like.

  Since the cargo vehicle 600 includes the fall prevention device 500 configured as described above on the loading platform 1, a person working on the loading platform 1 falls outside the loading platform 1 as described in detail later. Can be prevented.

(Configuration of each part of the device)
Next, details of each part of the fall prevention device 500 will be described with reference to FIGS. FIG. 2 is a front view showing the overall configuration of the column 10. As described above, the column 10 includes the columnar portion 40 and the pedestal portion 50. In the following example, the main part of the support column 10 is made of steel, but a light metal, for example, an aluminum alloy may be used as a material in order to further reduce the weight.

  The columnar portion 40 is supported and fixed to the pedestal portion 50 by inserting a lower end into a receiving portion (not shown) of the pedestal portion 50. In the following example, the columnar section 40 is embodied as a hollow prism. An annular member 13 is attached to the top of the columnar portion 40 by welding, for example. Further, a pair of fin-shaped protrusions 12 are attached to the vicinity of the center of the columnar part 40 by, for example, welding. The pair of annular members 11 are attached to the pedestal portion 50 by welding, for example. The annular members 11 and 13 are provided as members for attaching the ropes 30 and 31, respectively. Moreover, the hole is formed in the projection part 12, and the projection part 12 contains an annular member by it. A rope for suspending the net 20 can also be attached to the annular member defined by the protrusion 12. As an object to which a rope for suspending the net 20 is attached, two types of an annular member 11 and a protruding portion 12 can be selected, and thereby the height of the net 20 can be changed.

  A pair of reinforcing members 360 are preferably detachably connected between the pair of protrusions 12 and the base 50. In addition to the hole for attaching the rope, the protrusion 12 is formed with a hole for attaching one end of the reinforcing member 360. In addition, a pair of protrusions 56 in which holes are formed are attached to the pedestal 50 by, for example, welding. Both ends of the reinforcing member 360 are attached to the protrusions 12 and 56 by bolts that are inserted into these holes and tightened with nuts. The pair of reinforcing members 360 are provided on both sides of the columnar portion 40 so as to be symmetrical. A turnbuckle 361 is interposed in the reinforcing member 360, and tension can be applied to the reinforcing member 360 by rotating the turnbuckle.

  The reinforcing member 360 functions to reinforce the columnar portion 40 by connecting the columnar portion 40 and the pedestal portion 50 with tension. When the net 20 receives the body of a person who is about to fall, shocking tension is applied to the ropes 30 and 31. As a result, a force for pulling down the rope 30 in the direction in which the rope 30 is stretched acts on the columnar portion 40 that supports the rope 31. That is, a load for tilting the columnar portion 40 around the receiving portion of the pedestal portion 50 that supports the lower end portion of the columnar portion 40 is generated. The reinforcing member 360 relieves a large moment applied to the lower end portion of the reinforcing member 40 and the receiving portion of the pedestal portion 50 by adding a reaction to the load to the columnar portion 40 and restrains the tilting of the columnar portion 40. . That is, the reinforcing member 360 serves to increase the strength of the entire support column 10 against a load that tends to tilt the columnar section 40.

  FIG. 3 is a perspective view showing the configuration of the pedestal portion 50. The pedestal portion 50 includes a trunk portion 200 that is a portion that rests on the edge of the collar 2, and four leg portions 201 to 204 that project downward from the trunk portion 200 so as to sandwich the collar 2. The trunk | drum 200 and the leg parts 201-204 are integrally connected by welding. The pair of leg parts 201 and 202 facing each other and the pair of leg parts 203 and 204 facing each other are positioned at two positions along the edge of the heel 2 so that the left and right end parts of the trunk part 200 It is linked to.

  The body portion 200 includes a front plate 51, a back plate 52, a pair of connection plates 55, a pair of connection plates 57, and a contact plate 59. The front plate 51 and the back plate 52 that are paired in the front-rear direction are connected by a pair of connecting plates 55, a pair of connecting plates 57, and a contact plate 59. These are connected together by welding. The contact plate 59 corresponds to a specific example of the contact member of the present invention, and plays a role of positioning the pedestal 50 on the edge of the flange 2 by contacting the edge of the flange 2. The pair of connecting plates 55 functions as a base for fixing the protruding portion 56 and the annular member 11. The pair of connecting plates 57 constitutes a cylindrical receiving portion 205 in cooperation with the front plate 51 and the back plate 52, and receives the insertion of the lower end portion of the columnar portion 40, thereby supporting the columnar portion 40 in a fixed manner. Fulfills the function of Of the front plate 51 and the back plate 52, a pair of holes 58 for inserting bolts for preventing the columnar portion 40 from being inserted is formed in a portion corresponding to the receiving portion 205.

  As shown in the partial sectional view of FIG. 4, the receiving portion 205 is bottomed by the contact plate 59. When the lower end portion of the columnar portion 40 is inserted into the receiving portion 205, the columnar portion 40 is positioned by the contact plate 59. In this state, a hole 58 formed in the front plate 51 and the back plate 52 and a pair of holes 41 formed in the lower end portion of the columnar portion 40 overlap each other. As a result, one bolt can be easily inserted into the hole 58 and the hole 41. By tightening the inserted bolt with a nut, the columnar portion 40 can be prevented from coming out of the receiving portion 205.

  Returning to FIG. 3, each of the left and right leg parts 201 and 203 has a pair of leg plates 53, a screw support part 60, a pressing member 61, a screw 63, and a handle 64. The pair of leg plates 53 are integrally connected to the front plate 51 and the contact plate 59 of the trunk portion 200 by welding. The screw support portion 60 is a member that supports the screw 63 by screwing, and is fixed by being sandwiched between a pair of leg plates 53. The pair of leg plates 53 and the screw support portion 60 are integrally connected by welding. In FIG. 3, the support 60 is embodied by a commercially available nut. Further, the pair of leg plates 53 are fastened by bolts and nuts, thereby increasing the strength against an external force that increases the distance between each other. A lever 64 for rotating the screw 63 manually is attached to the base end portion of the screw 63. On the other hand, a pressing member 61 is attached to the tip of the screw 63 to abut against the outer main surface of the flange 2 by advancing with the rotation of the screw 63 and press the outer main surface.

  Each of the left and right leg portions 202 and 204 has a pair of leg plates 54 and a pressing plate 65. The pair of leg plates 54 are integrally connected to the back plate 52 and the contact plate 59 of the trunk portion 200 by welding. The pressing plate 65 is located at a position facing the pressing member 61 and is fixed by being sandwiched between a pair of leg plates 54. The pair of leg plates 54 and the pressing plate 65 are integrally connected by welding. Similarly to the pair of leg plates 53, the pair of leg plates 54 are fastened by bolts and nuts, thereby increasing the strength against an external force that widens the distance between them. The pressing plate 65 corresponds to a specific example of the pressing member of the present invention, and cooperates with the pressing member 61 to play a role of tightening the outer main surface and the inner main surface of the flange 2. Note that the main surface of the rod 2 facing the outside of the loading platform 1 when the rod 2 is closed upward is referred to as an outer main surface, and the main surface facing inward is referred to as an inner main surface. As described above, the pedestal portion 50 has a clamp structure.

  FIG. 5 is an explanatory diagram showing a mounting state of the pedestal portion 50 to the flange 2. As shown in FIG. 5, the pedestal portion 50 having a clamp structure has an edge of the heel 2 when the heel 2 connected to the floor plate 3 of the loading platform 1 via the hinge 5 is closed upward. Attached to straddle. When the screw 63 is rotated to the right by manually operating the handle 64, the screw 63 advances and the pressing member 61 contacts the outer main surface of the heel 2 to press the outer main surface. At the same time, the pressing plate 65 facing the pressing member 61 abuts against the inner main surface of the flange 2 and presses the inner main surface. Thus, the base part 50 which has a clamp structure is fixed to the edge of the collar 2 by clamping and pinching the outer main surface and inner main surface of the collar 2. Therefore, it is possible to attach the pedestal portion 50 to the heel 2 without performing any processing on the heel 2.

  Some commercially available truck ridges 2 have square-shaped bulges along their edges. Of all the 100 types of commercial trucks investigated by the inventors of the present application, the cross-sectional dimension of the bulge is less than 50 mm with respect to the thickness of the heel 2 and the width from the edge of the heel 2 It was 50 mm or less. Therefore, the distance X between the leg plate 53 and the leg plate 54 facing each other is set to 50 mm or more, and the distance Y between the surface where the contact plate 59 contacts the edge of the flange 2 and the pressing member 61 is set to 50 mm or more. desirable. In other words, the pedestal portion 50 has a shape that can hold the heel 2 while holding the bulge so as not to interfere with the square-shaped bulge having a cross-sectional dimension of 50 mm × 50 mm that the heel 2 has along the edge. Is desirable.

  Some trucks have a ridge 2 that does not have a bulge at the edge, as depicted by the dotted line in FIG. The pedestal 50 configured not to interfere with the bulge can be attached to the heel 2 having no bulge without any problem. Further, the thickness of the heel 2 having no bulge was less than 50 mm as far as the above investigation was concerned. Therefore, the pedestal portion 50 having the intervals X and Y of 50 mm or more can be attached to all the cages 2 of the commercially available truck as long as the investigation is performed. That is, it can be said that this pedestal 50 is applicable to virtually all trucks in the country.

  The pressing member 61 includes an engaging member 66 that engages with the screw 63 and an elastic member 67 that is attached to the engaging member 66. When the screw 63 is rotated clockwise, a pressing force is transmitted to the elastic member 67 through the engaging member 66. The elastic member 67 abuts on the outer main surface of the flange 2. For this reason, the base part 50 can clamp the collar 2 without damaging the outer main surface of the collar 2. In addition, since the fastening force is stably maintained by the elastic restoring force of the elastic member 67, the pedestal portion 50 is stably fixed to the flange 2. The elastic member 67 is made of, for example, rubber, and more preferably, urethane that can obtain high strength.

  FIG. 6 is a partial cross-sectional view showing the structure of the pressing member 61. In FIG. 6, the engaging member 66 is embodied as a rectangular parallelepiped having a hollow inside. The screw 63 passes through the front wall of the engaging member 66, and the tip of the screw 63 faces or abuts on the inner surface of the back wall located on the opposite side of the front wall. An elastic member 67 is attached to the outer surface of the back wall facing the tip of the screw 63. The elastic member 67 is fixed to the back wall with, for example, a screw (not shown). A locking member 70 is attached to the screw 63 by welding, for example. The locking member 70 is, for example, an annular member. In FIG. 6, a washer is used as the locking member 70.

  The engaging member 66 is rotatable with respect to the screw 63. Thereby, the screw 63 can be smoothly rotated. In particular, the tip of the screw 63 protrudes at the central portion, and the top of the protruding portion abuts against and presses the central portion of the inner surface of the back wall of the engaging member 66, thereby applying a pressing force to the engaging member 66. The For this reason, the screw can be rotated more smoothly. Further, since the rotation of the elastic member 67 accompanying the rotation of the screw 63 is suppressed, there is an advantage that the elastic member 67 is not easily worn and the outer main surface of the flange 2 is not easily damaged. In particular, the pressing member 61 is slidably sandwiched between the pair of leg plates 53, whereby the rotation of the pressing member 61 is restricted by the pair of leg plates 53. That is, the pair of leg plates 53 corresponds to a specific example of the guide member of the present invention. For this reason, since the rotation of the elastic member 67 accompanying the rotation of the screw 63 is surely restricted, the wear of the elastic member 67 and the damage to the outer main surface of the flange 2 are further suppressed.

  On the other hand, the engaging member 66 is restrained in the axial direction of the screw 63 by the tip of the screw 63 and the locking member 70. For this reason, when the screw 63 is rotated counterclockwise, the pressing member 61 is not detached from the screw 63 as the screw 63 is retracted even after the pressing state of the heel 2 by the pressing member 61 is released.

  FIG. 7 is a schematic external view showing a mechanism in which the support column 10 supports the rope 31. One end of the rope 31 is detachably supported by the annular member 13 of the support 10 </ b> A via the carabiner 32. A tensioner 33 is attached to one end of the rope 31, and the rope 31 is supported by the annular member 13 via the tensioner 33 in addition to the carabiner 32.

  FIG. 8 is an external view showing the carabiner 32 and the tensioner 33 in an enlarged manner. The carabiner 32 has a ring-shaped portion, and has a lever 34 that can be opened and closed at a part of the ring-shaped portion. The lever 34 can be locked by another pin. The tensioner 33 has a lid that opens and closes. The tensioner 33 is put into use by closing the lid with the rope 31 interposed therebetween and fastening the screw 35. The tensioner 33 restrains the movement in one direction of the rope 31 and does not restrain the movement in the other direction. Therefore, after attaching the carabiner 32 to the annular member 13, the rope 31 can be tensioned with a desired strength by pulling one end of the rope 31. Further, the restraint state of the rope 31 can be released by tilting the lever 36 of the tensioner 33 in a predetermined direction. Therefore, the carabiner 32 can be easily removed from the annular member 13 by releasing the tension state of the rope 31 after the work of unloading the load on the loading platform 1 is completed.

  As illustrated in FIG. 1, the other end of the rope 31 is also detachably supported by the annular member 13 via a carabiner. The tensioner 33 may be attached to both ends of the rope 31, but if it is attached only to one end as shown in FIG. 1, it is sufficient to apply tension to the rope 31. The rope 30 is detachably supported by the annular members 11 (see FIG. 2) of the support columns 10A and 10B by a mechanism similar to the support mechanism of the rope 31.

  As described above, since the ropes 31 and 30 are supported by the support pillars 10A and 10B via the carabiner 32, the attachment work and the removal work of the ropes 31 and 30 to the support pillars 10A and 10B can be easily performed. . Further, since one end of each of the ropes 31 and 30 is supported by the support column 10A via the tensioner 33, a desired tension can be applied to the ropes 31 and 30. Further, by releasing the tension, the ropes 31 and 30 can be easily detached from the columns 10A and 10B.

  FIG. 9 is an enlarged external view showing a mechanism in which the rope 31 supports the net 20. A thread or rope 21 and a rope 31 along the edge of the net 20 are detachably connected by a carabiner 22. In the carabiner 22 depicted in FIG. 9, the openable / closable lever can be locked by a hook-shaped protrusion provided on a part of the ring-shaped portion. The carabiner 22 is attached to the rope 21 at an appropriate interval. The rope 30 supports the net 20 by a mechanism similar to the mechanism in which the rope 31 supports the net 20. Thus, since the net | network 20 is detachably attached to the ropes 31 and 30 via the carabiner 22, the attaching operation | work to the ropes 31 and 30 of the net | network 20 and a removal operation | work can be performed easily.

  8 and 9 exemplify carabiners having a specific structure, but carabiners having other structures may be used as long as they are detachably connected.

(Device assembly method)
10 to 14 are process diagrams showing a process of assembling the fall prevention device 500 on the loading platform 1. These steps can be performed by personnel. In order to assemble the device 500, first, as shown in FIG. Here, the base part 50 shall be attached to the four corners of the loading platform 1. In order to attach the pedestal portion 50, the body portion 200 is placed on the heel 2 so that the contact plate 59 (see FIG. 3) is brought into contact with the edge of the heel 2. Thereafter, the pair of handles 64 are rotated to the right so that the legs 201 to 204 tighten the outer main surface and the inner main surface of the heel 2. Thereby, the base part 50 is fixed to the eaves 2.

  Next, as shown in FIGS. 11 and 12, the columnar portion 40 is attached to each pedestal portion 50. In order to attach the columnar portion 40 to the pedestal portion 50, the columnar portion 40 is lifted on the loading platform 1 in an upright state, and the lower end portion thereof is inserted into the receiving portion 205 (see FIG. 4) of the pedestal portion 50. Thereafter, a bolt is inserted into the hole 58 and the hole 41, and the bolt is tightened with a nut, whereby the columnar part 40 can be brought upright on the base part 50. Thereafter, the reinforcing member 360 is attached to the columnar portion 40 and the pedestal portion 50 using bolts and nuts. Subsequently, a tension is applied to the reinforcing member 360 by rotating the turnbuckle 361 (see FIG. 2) of the reinforcing member 360. Through the above steps, the column erecting step for erecting the column 10 on the outer periphery of the loading platform 1 is completed. In addition, as shown in FIG. 12, the support | pillar 10 provided in the right front of the loading platform 1 is represented by the code | symbol 10C as needed, and the support | pillar 10 provided in the right rear is represented by the code | symbol 10D as needed. Further, the heel 2 is described as a left heel 2L, a right heel 2R, and a rear heel 2B when it is particularly necessary to distinguish them.

  Next, as shown in FIG. 13, an operation of expanding the net 20 between the support 10A and the support 10B is performed. One end edge of the net 20 is attached to the rope 30 via a carabiner 22 (see FIG. 4), and the other end edge is attached to the rope 31 via a carabiner 22. In the example of FIG. 13, the vicinity of the center of the both end edges of the mesh 20 is attached to the rope 37 via the carabiner 22 in order to make it possible to adjust the height at which the mesh 20 is developed. In this way, the ropes 30 and 31 are attached to the net 20 and, if necessary, the rope 37 is attached in advance. Further, a carabiner 32 and a tensioner 33 (see FIG. 8) are attached to the ropes 30, 31 and 37 in advance.

  In order to unfold the net 20, first, the ropes 30 and 31 are attached to the annular members 13 and 11 (see FIG. 2) of the columns 10A and 10B via the carabiner 32 (see FIG. 7). FIG. 13 illustrates a state after attachment. Then, tension | tensile_strength is provided to the ropes 30 and 31 by pulling the edge part of the ropes 30 and 31 in the side to which the tensioner 33 is attached, and the ropes 30 and 31 will be in a tension | tensile_strength state.

  Next, returning to FIG. 1, the horizontal end of the net 20 is connected to the support columns 10 </ b> A and 10 </ b> B with a string (string) 25 or the like. Through the above steps, the net unfolding step for unfolding the net 20 between the columns 10A and 10B as shown in FIG. 1 is completed. The net 20 can be developed between the columns 10C and 10D through the same net development process. Moreover, as shown in FIG. 14, the net | network 20 can be expand | deployed also between the support | pillar 10B and the support | pillar 10D, ie, the back of the loading platform 1, through the same process. Moreover, although illustration is abbreviate | omitted, the net | network 20 can be expand | deployed also between the support | pillar 10A and the support | pillar 10C, ie, the front of the loading platform 1, through the same process. As described above, the fall prevention device 500 can be installed on the loading platform 1 by a simple manual operation.

(Function and advantage of the device)
FIG. 15 is a schematic explanatory diagram illustrating functions and advantages of the fall prevention device 500. When the cargo vehicle 600 piled with the load 90 enters the unloading work place, the fall prevention device 500 is installed on the loading platform 1 according to the steps shown in FIGS. Thereby, the net | network 20 is expand | deployed above the outer peripheral part of the loading platform 1. FIG. Then, as shown in FIG. 15, the operation | work which unloads the heavy load 90 from the loading platform 1 using a crane is performed. In FIG. 15, H-shaped steel is depicted as an example of the load 90.

  When unloading the load 90 from the loading platform 1 using a crane, as shown in FIG. 15, a person 100 climbs on the loading platform 1 or the loading object 90 and uses a lifting tool such as a wire rope. Thus, it is necessary to prepare for hanging the load 90 on the hook 91, or to perform a work (a so-called sling) such as making a signal and lifting the load 90 at a predetermined position. At this time, as shown schematically in FIG. 16, the load 100 may lose the center of gravity of the body or the scaffolding due to unexpected movement of the load 90 or the like. Even if such an unexpected situation occurs, the deployed net 20 receives the body of the personnel 100 and prevents the personnel 100 from falling from the loading platform 1.

  Further, unlike the case of using a rigid fence as in the prior art disclosed in Patent Document 1, the flexibility of the net 20 has the advantage that the impact received by the personnel 100 when receiving the body is light. It is done. Furthermore, since the net | network 20 receives a body flexibly, the danger that the personnel 100 will be pressed by the load 90 which moves unexpectedly is reduced. Further, due to the flexibility of the net 20, the personnel 100 can work on the loading platform 1 or the load 90 while pushing the net 20 to some extent with a part of the body such as an arm. That is, the freedom of body freedom by the net 20 is gradual, and the work space of the narrow and limited carrier 1 is substantially widened. Furthermore, since the restraint of freedom of the body is gentle, the mental pressure of the person 100 who works on the narrow carrier 1 is reduced. As described above, the fall prevention device 500 increases the safety on the loading platform 1 and at the same time improves the workability.

  Moreover, since the fall prevention apparatus 500 uses the lightweight net | network 20 as a member which receives the body of the personnel 100, it is lightweight also as the whole apparatus. Moreover, since the support | pillar 10 can be attached or detached, the fall prevention apparatus 500 can be removed while driving | running | working the cargo vehicle 600. FIG. Due to the light weight of the device and the indefinite shape of the mesh 20, the fall prevention device 500 can be compactly loaded on the loading platform 1 of the cargo vehicle 600 in a disassembled state when not in use.

  In FIG. 1, an example is shown in which the net 20 has a lateral length close to the interval between the column 10A and the column 10B. However, the same net | network 20 can be expand | deployed also between the support | pillar 10A and the support | pillar 10B with a narrow space | interval. In this case, the net 20 is deployed with a margin in the lateral direction, but the effect of receiving the body of the person 100 remains unchanged. Therefore, by preparing sufficiently long nets 20 and ropes 30 and 31, it is possible to install the same fall prevention device 500 in various cargo vehicles 600 having different loading platform 1 lengths. It becomes. Moreover, it is also possible to use the net | network 20 and the ropes 30 and 31 of the same dimension in the left-right side of the loading platform 1, and the front and back. Further, a set of members before assembling the fall prevention device 500 is prepared and entered at a work site where various cargo vehicles 600 having different lengths of the loading platform 1 enter and unload the load 90. It is also possible to adopt a usage pattern in which the same fall prevention device 500 is installed in the cargo vehicle 600.

  As described above, the fall prevention device 500 configured to deploy the net 20 between the pillars 10 has a simple configuration, but in various points such as safety, workability, portability, and flexibility of application. The cargo vehicle 600 is suitable for use on the loading platform 1. Moreover, since the support | pillar 10 is what is attached to the eaves 2 with the clamp structure which the base part 50 has, it is not necessary to give any processing to the commercial cargo vehicle 600. FIG. Further, since the column 10 is not supported by the floor plate 3 of the loading platform 1 but supported by the eaves 2, the floor plate 3 of the loading platform 1 can be widely used for loading the load 90.

  1 and 4 show an example in which the net 20 is deployed in front, rear, left, and right of the loading platform 1, but various deployment methods can be adopted depending on the situation of the work site and the work content. . For example, when there is a risk of falling of the personnel 100 only on the left side of the loading platform 1, the personnel 100 can be obtained by installing only the columns 10A and 10B as the column 10 and deploying the net 20 between them. It is possible to achieve the purpose of ensuring safety. Alternatively, when there is a risk of falling of the personnel 100 only on the left side and the right side of the loading platform 1, four columns 10A to 10D are erected between the columns 10A and 10B and the column 10C. It is also possible to adopt an installation form in which the network 20 is deployed only during 10D.

  As shown in FIGS. 1 and 12, a cargo vehicle 600 embodied as a truck is usually provided with a so-called torii 6 as a wall surface or a fence-like structure in front of the loading platform 1. is there. Also in the loading platform 1 provided with the torii 6, when the load 90 is piled up tall and there is a possibility that the personnel 100 may work at a height exceeding the torii 6, the net 20 is also provided in front of the loading platform 1. There is a significance to deploy. Even if there is no fear of exceeding the torii 6, it is desirable to deploy the net 20 in front of the loading platform 1 in order to reduce the impact of the body at the time of falling.

  Further, when four struts 10A to 10D are erected at the four corners of the loading platform 1 and the net 20 is deployed in four directions on the front, rear, left and right of the loading platform 1, the four supporting columns 10A to 10D are Since they are connected to each other by the rope 31, the shock load generated when the net 20 receives the body of the person 100 is distributed to all the four columns 10 </ b> A to 10 </ b> D. That is, since the four struts 10A to 10D cooperate to support a load acting on a part of the net 20, concentration of the load on any of the struts 10A to 10D is reduced. In particular, since the collar 2 has a structure that does not tilt inward beyond the state in which it is closed upward, an outward load acting on one of the left and right nets 20 can be effectively supported by the other column. . Even when the four struts 10A to 10D are erected at the four corners of the loading platform, even when the mesh 20 is deployed only on the left side and the right side of the loading platform 1, only the rope 31 is attached to the loading platform 1. By spanning forward and backward, the same load distribution effect can be obtained.

  1 and 14 show an example in which the net 20 is unfolded between the rope 30 and the rope 31 in a state where the net 20 is gently suspended. In contrast, as shown in FIG. 17, the net 20 may be deployed between the rope 30 and the rope 31 in a tensioned state. Depending on the relationship between the length of the mesh 20 in the vertical direction and the distance between the annular member 13 and the annular member 11 (see FIG. 2) attached to the support column 10, the form of deployment of the mesh 20 differs.

  When the deployment of the net 20 is excessively loose, the person 100 who is about to fall down jumps out of the loading platform 1 and is received by the net 20 near the ground. In this case, the configuration is the most excellent in that the pressure from the load 90 is avoided. On the other hand, when the net 20 is deployed in an excessively tensioned manner, the personnel 100 does not protrude from the outside of the loading platform 1, and there is an advantage that the impact of the falling is not required. The advantage of the net 20 that avoids compression is weakened compared to the case where the net 20 is loose. However, even in that case, the fall prevention device 500 has an advantage in terms of avoiding pressure as compared to a rigid fence. It is advisable to select the form of deployment of the network 20 as appropriate according to the situation at the site.

(Process to change the height of the net)
FIG. 18 is a process diagram showing an operation process for changing the height of the net 20. As the work for lowering the load 90 (see FIG. 15) piled up on the loading platform 1 proceeds, the height of the load 90 decreases. When the load 90 is lowered to a certain level or less, as shown in FIG. 18, after the rope 37 is attached to the protrusion 12 and is tensioned, the tension of the rope 31 is released, and the rope 31 is further connected to the annular member 13 (FIG. 2). As a result, as shown in FIG. 19, the mesh 20 is deployed between the rope 37 and the rope 30, and the height of the deployed mesh 20 is the center of the columnar portion 40 provided with the protrusions 12. It will be lowered to the vicinity of the club. Accordingly, it is possible to prevent the personnel 100 working on the lowered load 90 from falling, and when the load 90 is lifted by the hook 91, the load 90 in the air interferes with the net 20. This can be prevented. That is, when lifting the load 90, the restriction on the posture of the load 90 in the air is released immediately after lifting. As a result, the work efficiency of the work for lowering the load 90 is improved. Note that the rope 37 can also be hung on the support columns 10A and 10B at the same time in the process of FIG. 13 where the ropes 30 and 31 are hung.

  When loading the load 90 on the loading platform 1, it is preferable to first deploy the net 20 between the rope 30 and the rope 37 as shown in FIG. 19. As the work progresses thereafter, as shown in FIG. 18, the rope 31 is attached to the annular member 13 (see FIG. 2) and tension is applied, so that the rope 31 is stretched between the support 10A and the support 10B. good. Thereby, the net | network 20 can be expand | deployed between the rope 30 and the rope 31, as shown in FIG. In this case, the rope 37 can be left over without being removed thereafter.

(The form which added the reinforcement member)
As illustrated in FIG. 20, the support column 10 can be reinforced by the reinforcing member 110 that connects the support column 10 and the flange 2. In the example of FIG. 20, the other ends of the reinforcing members 110B and 110D each having one end attached to each of the columns 10B and 10D are attached to the rear collar 2B via clamps 111B and 111D. One end of the reinforcing member 110B is detachably attached by a bolt and a nut (not shown) to a hole provided in a projection (not shown) attached in the vicinity of the center portion of the column 10B. Further, the other end of the reinforcing member 110B is detachably attached to the clamp 111B that is detachably attached to the rear heel 2B by tightening over the end edge of the rear heel 2B. Similar to the reinforcing member 360, the reinforcing member 110B has a turnbuckle 112 that applies tension to itself. The reinforcing member 110D has a structure equivalent to that of the reinforcing member 110B, and is attached to the column 10D and the rear rod 2B by an equivalent mechanism.

  The reinforcing member 110B functions to reinforce the columnar portion 40 by connecting the column 10B and the rear rod 2B with tension. As already described, when the net 20 receives the body of the person 100 who is about to fall, shocking tension is applied to the ropes 30 and 31. As a result, a force for pulling down the rope 30 in the direction in which the rope 30 is stretched acts on the columnar portion 40 that supports the rope 31. The load acting on the column 10B when the net 20 deployed between the column 10A and the column 10B receives the body of the person 100 is in a direction to tilt the columnar portion 40 of the column 10B forward of the loading platform 1. Mainly works. At the same time, a load for tilting the columnar portion 40 of the column 10B toward the left side of the loading platform 1 also acts on the column 10B. The reinforcing member 110 </ b> B relieves a large moment applied to the lower end portion of the reinforcing member 40 and the receiving portion 205 of the pedestal portion 50 by adding a reaction against the load to the columnar portion 40, and to the left side of the columnar portion 40. Restrains the tilting. In other words, the reinforcing member 110B functions to increase the strength of the entire column 10B against a load that tends to tilt the columnar portion 40 of the column 10B to the left. Similarly, the reinforcing member 110D functions to increase the strength of the entire support column 10D with respect to a load that tends to tilt the columnar portion 40 of the support column 10D to the right.

(Example of diversion of equipment members)
21 and 22 are schematic explanatory views showing an example in which a part of the fall prevention device 500 is diverted to other uses. In the example of FIG. 21, the columns 10 </ b> A to 10 </ b> D are diverted for the purpose of preventing load collapse of the load 95 on the loading platform 1. In this case, it is desirable to route the ropes 120 and 121 between the column 10A and the column 10C and between the column 10B and the column 10D, respectively. Thereby, the pillars 10A to 10D can support the load 95 with higher strength. The ropes 120 and 121 are preferably attached to the columns 10A to 10D via the carabiner 32 and the tensioner 33 (see FIG. 8) in the same manner as the rope 31, and the rope 31 may be diverted as it is.

  In the example of FIG. 22, the columns 10 </ b> A to 10 </ b> D are used as columns that support the hood 130 that protects the load on the loading platform 1 from rain or the like.

  As described above, the fall prevention device 500 can be used for other purposes specific to the freight vehicle 600 by taking advantage of the characteristic that it can be mounted on the vehicle and keeping a part thereof attached to the loading platform 1 of the freight vehicle 600. It can be diverted. Thereby, even after the loading / unloading operation of the load 90 is completed, it is possible to effectively use the members that are still attached to the loading platform 1 while omitting the trouble of removing all the members of the fall prevention device 500 from the loading platform 1. it can.

(Other embodiments)
(1) FIG. 23 is a perspective view showing another embodiment of the pedestal portion of the column 10. FIG. 24 is a partial cross-sectional view showing a usage state of the pedestal portion. The pedestal portion 150 includes the pedestal portion 50 shown in FIG. 3 and another receiving portion 151 attached to the pedestal portion 50. The receiving part 151 is provided in order to make it possible to stand the columnar part 40 in a state where the collar 2 is opened downward. When the eaves 2 are opened downward, the eaves 2 are attached to the support member 160 protruding downward from the floor plate 3 of the loading platform 1 and come into contact with the eaves contact member 161 made of rubber or the like. There is no. Therefore, the tilting of the columnar section 40 due to the load generated when the net 20 receives the body of the person 100 (see FIG. 16) can be stably regulated by the rod 2.

  The receiving portion 151 is fastened and fixed to the front plate 51 with a bolt, and receives the insertion of the lower end portion of the columnar portion 40, thereby fulfilling the function of supporting the columnar portion 40 in a fixed manner. The receiving portion 151 is preferably bottomed, and when the lower end portion of the columnar portion 40 is inserted, the columnar portion 40 is positioned by the bottom of the receiving portion 151. In this state, the hole 152 formed in the receiving portion 151, the hole 153 formed in the front plate 51, and the pair of holes 41 formed in the lower end portion of the columnar portion 40 overlap each other. As a result, one bolt 154 can be easily inserted into the hole 152 and the hole 153. By tightening the inserted bolt 154 with a nut, the columnar portion 40 can be prevented from coming out of the receiving portion 151. The hole 153 formed in the front plate 51 can also serve as the hole 58 (see FIG. 3).

  The pedestal portion 150 is formed by attaching another receiving portion 151 to the pedestal portion 50 (see FIGS. 3 and 4) that already has the receiving portion 205. Therefore, the pedestal 150 allows the columnar portion 40 to be raised by being attached to the heel 2 regardless of whether the heel 2 is closed upward or in a state where it is opened downward. That is, the pedestal unit 150 can be used properly according to the situation of the work place. Moreover, since the receiving part 151 is attached to the base part 50 so that attachment or detachment is possible with a volt | bolt, it is also possible to attach to the base part 50 and use it only when needed.

  Further, the attaching operation of the pedestal 150 to the heel 2 can be performed in a state where the heel 2 is closed upward, and then the heel 2 is opened downward to attach the columnar portion 40. Similarly, the removal work of the pedestal part 150 from the ridge 2 can be performed by removing the columnar part 40 from the pedestal part 150 and then closing the ridge 2 upward. In this way, the pedestal portion 150 can be easily attached to and detached from the heel 2.

  25 and 26 are schematic explanatory diagrams of the work of unloading the load 90. When the heavy load 90 on the loading platform 1 is lowered using a crane, the wire rope 302 for hanging on the hook 91 of the crane is passed through the side and the lower side of the load 90 to be lifted (hanging) One of the tasks). As shown in the right side fence 2R illustrated in FIG. 25, when the fence 2 is in a state of being closed upward, a narrow gap between the fence 2 and the load 90, and the flooring 301, depending on how the load 90 is stacked. In some cases, it may be difficult to pass the wire rope 302 through the gap between the floor board 1 and the load 90 made by the above-described method.

  In such a case, as in the port 2L illustrated in FIGS. 25 and 26, when the rod 2 is open downward, the operation of passing the wire rope 302 can be performed efficiently. If the pedestal 150 is used, the net 20 can be deployed above the outer periphery of the loading platform 1 with the basket 2 opened downward, so that the safety of the personnel 100 (see FIGS. 15 and 16) who perform the work can be improved. While aiming, the slinging operation can be performed efficiently. Since the net 20 is flexible, it does not prevent the personnel 100 from performing such a slinging operation inside the net 20. Even when the pedestal portion is attached to the rear lid 2B, if the pedestal portion 150 is used, it is possible to efficiently perform the slinging operation at the rear portion of the loading platform 1 while ensuring safety.

  (2) FIG.27 and FIG.28 is a figure for demonstrating the fall prevention apparatus assembled by standing upright on a loading platform, without using the base parts 50 and 150. FIG. FIG. 27A is a schematic plan view of a freight vehicle 601 as a trailer vehicle, and FIG. 27B is a cross-sectional view of the cargo bed 160 taken along the line PP in FIG. 27A. In a commercially available trailer vehicle, a mounting hole 161 for inserting a column 162 for preventing load collapse is generally formed in the floor plate of the loading platform 160. The attachment hole 161 is disposed along the outer periphery of the loading platform 160.

  As shown in FIG. 28, by appropriately setting the width of the columnar portion 40, the columnar portion 40 can be detachably fixed to the loading platform 160 using the attachment holes 161. As shown in FIG. 28, it is possible to insert the lower end portion of the columnar portion 40 into the mounting hole 161 at a predetermined depth by providing a locking projection 164 on the side surface near the lower end portion of the columnar portion 40. It becomes. The protrusion 164 has a hole, and functions as an annular member for attaching the rope 30 (see FIG. 1) similarly to the annular member 11. The protruding portion 164 is attached to the columnar portion 40 by welding, for example, similarly to the protruding portion 12.

  The column 310 configured as described above is used as a column for unfolding the net 20 by spanning the ropes 30, 31, and 37 without using the pedestals 50 and 150, similarly to the column 10 (FIG. 2) of the fall prevention device 500. be able to. On the other hand, the column 310 can be used as a columnar portion attached to the pedestal portions 50 and 150 in the same manner as the columnar portion 40 shown in FIGS. Furthermore, it is also possible to divert only the column 310 as a column for preventing the collapse of the load like the commercially available column 162 without installing the ropes 30, 31, 37 and the net 20.

  If the columnar portion 40 only needs to be diverted to a column for preventing collapse of the load and it is not necessary to use it as a column for deploying the net 20 on the loading platform 160, a columnar shape as illustrated in FIG. It is only necessary to provide the protrusion 163 having a simpler structure at the lower end of the portion 40. The protruding portion 163 is formed by attaching a sheet metal piece having a required thickness to the columnar portion 40 by welding, for example. Both the protrusions 163 and 164 attached to the lower end of the columnar part 40 are also used as locking members that determine the insertion position of the columnar part 40 when the receiving parts of the base parts 50 and 150 are bottomless. You can also.

  (3) FIG. 30 is a front view showing an example in which the support column 10 is extendable. The column 170 has a fixed columnar portion 171 and a movable columnar portion 172 as the columnar portion 173. The fixed columnar portion 171 is detachably fixed to the pedestal portion 50 at its lower end, similarly to the columnar portion 40 (see FIG. 2). The fixed columnar portion 171 is formed in a cylindrical shape or a tubular shape, and thereby accommodates the movable columnar portion 172 so as to be slidable. A rack gear 174 is engraved on one side surface of the movable columnar portion 172. Near the upper end portion of the fixed columnar portion 171, a gear box 175 that houses a combination gear for expanding and contracting the movable columnar portion 172 by transmitting the rotation of the handle 176 to the rack gear 174 is provided. A stopper 177 is provided near the upper end of the fixed columnar portion 171 to restrict the free fall of the movable columnar portion 172 by engaging with a gear in the gear box 175.

  If the extendable strut 170 is used, the height of the net 20 deployed on the loading platform 1 can be easily changed. In addition, the height of the net 20 can be changed continuously instead of stepwise. Furthermore, after attaching the rope 31 to the support column 170 at a low position where it is easy to work, it is possible to raise the support column 170 and expand the net 20 high. That is, the rope 31 can be easily attached to and detached from the support post 170.

  (4) FIG. 31 is a perspective view illustrating a pedestal portion that is detachably fixed to the collar 2 with screws. The pedestal portion 180 is formed in the same manner as the receiving portion 151 illustrated in FIG. The hole 181 corresponds to the hole 151. Therefore, the columnar portion 40 can be fixed by inserting the lower end portion of the columnar portion 40 into the pedestal portion 180 and fastening with the bolt.

  The pedestal portion 180 can be formed to be simpler and lighter than the pedestal portion 50. In FIG. 31, the pedestal portion 180 is bottomed, but the pedestal portion 180 may be formed without a bottom, and the lower end of the columnar portion 40 may be supported by the floor plate 3. Alternatively, the pedestal portion 180 may be formed without a bottom, and the column 310 of FIG. 28 or the columnar portion 40 of FIG. 29 may be inserted and used. Furthermore, in FIG. 31, although the base part 180 is attached to the inner main surface of the collar 2, it can also be used by attaching to the outer main surface. When the columnar part 40 of FIG. 2 or FIG. 29 is used as the columnar part inserted into the pedestal part 180, a tubular member (not shown) for attaching the rope 30 may be attached to the side wall surface of the pedestal part 180. . The tubular member can be formed in the same manner as the tubular member 11 (see FIGS. 2 and 3) or the protrusion 12 (see FIG. 2).

  (5) The fall prevention device according to the above embodiment deploys the net 20 between the plurality of support columns 10 via the ropes 30 and 31. On the other hand, it is also possible to expand the mesh 20 between the columns 10 by tying the mesh 20 to the tubular members 11, 13 and the like of the support column 10 without using the ropes 30 and 31.

  (6) Although the fall prevention device according to each of the above embodiments is attached to the loading platform of a large truck including a trailer, it can also be applied to general freight vehicles including railway vehicles.

1 is a schematic side view of a cargo vehicle including a fall prevention device according to an embodiment of the present invention. It is a front view which shows the whole structure of the support | pillar of FIG. It is a perspective view which shows the structure of the base part of FIG. It is a fragmentary sectional view of the base part of FIG. It is explanatory drawing which shows the attachment state to the collar of the base part of FIG. It is a fragmentary sectional view of the base part of FIG. It is the external appearance schematic which shows the mechanism in which a support | pillar supports a rope. It is an expansion external view of the carabiner and tension device of FIG. It is an expansion external view which shows the mechanism in which a rope supports a net | network. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is a schematic explanatory drawing which shows the function and advantage of the fall prevention apparatus of FIG. It is a schematic explanatory drawing which shows the function and advantage of the fall prevention apparatus of FIG. It is a side view which shows another usage pattern of the fall prevention apparatus of FIG. It is process drawing which shows the process of changing the height of the net | network of the fall prevention apparatus of FIG. It is explanatory drawing which shows the advantage which adjusts the height of the net | network of the fall prevention apparatus of FIG. It is a perspective view which shows the example which attached another reinforcement member to the fall prevention apparatus of FIG. It is a schematic explanatory drawing which shows the diversion example of the member of the fall prevention apparatus of FIG. It is a schematic explanatory drawing which shows another example of diversion of the member of the fall prevention apparatus of FIG. It is a perspective view which shows the base part by embodiment different from FIG. It is a fragmentary sectional view which shows the use condition of the base part of FIG. It is explanatory drawing which shows the advantage of the base part of FIG. It is explanatory drawing which shows the advantage of the base part of FIG. It is a schematic explanatory drawing of a commercial trailer vehicle. It is a figure which shows the support | pillar of the fall prevention apparatus by embodiment different from FIG. It is a figure which shows the columnar part by embodiment different from FIG. It is a figure which shows the support | pillar by embodiment different from FIG. It is a perspective view which shows the base part by embodiment different from FIG.3 and FIG.24.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,160 Loading platform 2L 2L Left side 2R Right side 2B Rear end 3 Floor board 10,10A-10D, 170,310 Post 11,11 Annular member 12 Protrusion part (tubular member) 20 Net 22, 32 Carabiner 30, 31, 37 , 81, 82 Rope 33 Tensioner 40, 173 Column 50, 150, 180 Base 53, 54 Leg plate (guide member) 59 Contact plate (contact member)
60 Screw support portion 61 Press member 63 Screw 65 Press plate (press member) 66 Engagement member 67 Elastic member 100 Person 110B, 110D, 360 Reinforcement member 112, 361 Turnbuckle 151, 205 Receiving portion 161 Hole 163, 164 Protrusion portion 163 , 164 Protrusion 500 Fall prevention device 600, 601 Cargo vehicle

  The present invention relates to a fall prevention device for preventing a person from falling from a loading platform of a cargo vehicle, a cargo vehicle provided with the device, a cargo vehicle enabling the installation of the device, and a method for assembling the fall prevention device. About.

  At a construction site, a material used for construction is carried into the site by a large truck (4 ton car, 10 ton car, trailer car, etc.). Incoming materials include materials used in relatively early stages of construction processes, such as H-shaped steel, reinforcing steel, formwork, and cement, as well as electrical materials, ducts, piping materials, plaster boards, wall cloths, tiles, blocks, It covers a wide range of materials, such as paints, finishing hardware, joinery, lighting, etc., which are required for the medium and late periods, and thus furniture after construction. In other words, large-scale trucks are carried in at the work site over the entire construction period, and sometimes carried out.

  In recent years, with the improvement of the safety level at the field work site, attention has been focused on the necessity of preventing accidents of falling of workers from the truck bed when materials are loaded and unloaded. This kind of fall accident has been greatly reduced as a result of heart and heart poured into the fall of workers from scaffolds and steel frames during construction. Therefore, as we went further and pursued the weaknesses and blind spots of the fall accident, attention has been focused on preventing the fall accident of workers from the truck bed.

  According to Articles 518 to 521 of the Occupational Safety and Health Regulations, when working at a place with a height of 2 meters or more, it is necessary to take measures to prevent the workers from falling, such as using a safety belt. Has been. The truck bed is no more than 2 meters above the ground. However, workers often work while standing on a load higher than the truck bed. In this case, even if the worker is at a height of 2 meters or less based on the loading platform or the load, the worker works at a height exceeding 2 meters when the ground is used as a reference. If it falls on the ground, the worker will be appropriately damaged and sometimes life threatened.

  Furthermore, in construction sites such as buildings, the ground is excavated deeply in the early stages of construction work to form the foundation and underground parts, and trucks carrying materials in and out are bridged over the excavated cavities. It is customary to stop on the pier and unload materials. In this case, once the worker falls from the truck bed, the worker may fall to the bottom of a few tens of meters.

  Therefore, conventionally, a master strut (a strut for stroking a safety strap to hang a safety belt) is attached to the highest part of the load on the loading platform, and as the work for lowering the load proceeds, Work was being done to reattach the leash struts one after another. However, this method has a problem that it is not efficient and is not suitable for the actual situation at the work site. In addition, an operator wearing a safety belt can avoid a crash to the ground, etc., when falling from the load, but it receives a concentrated load on the body part wearing the safety belt, and the body receives an impact. There was a problem that it could be a source of aftereffects.

  On the other hand, as a technique for preventing an operator from falling from a truck bed without using a safety belt, for example, Patent Document 1 discloses a detachable fence-like structure that is used by being attached to a luggage rack. Things are disclosed. However, this prior art provides a fence that can be gripped by a cage when an operator working on the loading platform loses the balance of the body, and does not reliably prevent falling from the loading platform. It was. In order to increase the effect of preventing falling, it is necessary to densely arrange the fence-like structure along the outer periphery of the loading platform. Moreover, in order to prevent the fall of the operator who works on the material loaded on the loading platform of a large truck, it is necessary to make a fence-like structure tall. As a result, the total weight of the fence-like structure increases, which is inconvenient to handle.

In addition, with the displacement of the load suspended by a crane or the like, the operator is likely to hit the body against the rigid fence-like structure by being pushed by the load. Furthermore, the operator may be sandwiched between the misaligned load and the fence-like structure, and may be pressed by the heavy load. In addition, since the worker must work in a narrow space surrounded by a fence-like structure as a wall that does not move, the problem is that the freedom of the body is restrained and the workability on the loading platform is bad There was a point.
JP 2004-058949 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a fall prevention technique that is light and easy to handle, and that can improve workability and safety on the loading platform.

In order to solve the above-mentioned problems and achieve the above-mentioned object, the invention according to claim 1 is a fall prevention device for preventing a person from falling from a cargo bed of a cargo vehicle, and is attached to and detached from an outer peripheral portion of the cargo bed. A plurality of struts standing upright, between each of the plurality of struts and any one of the plurality of struts adjacent to each strut along the outer periphery , and And a net deployed between different heights along each strut .

According to this structure, the net | network is developed between the group of the support | pillar standing adjacently along the outer peripheral part of a loading platform , and between different heights along each support | pillar, and, thereby, a loading platform. A net is developed above the outer periphery of the. For this reason, even if personnel who work on the cargo bed or on the load on the cargo bed lose their footing due to unforeseen circumstances, they can be prevented from falling from the cargo bed by the deployed net. it can. In addition, unlike the case of using a fence with rigidity, the impact of the body being received is small due to the flexibility of the net. Furthermore, even when personnel are pushed against the load, the net flexibly receives the body, reducing the risk of being subjected to pressure. That is, safety is improved.

  In addition, due to the flexibility of the net, personnel can perform work and the like while pushing the net to some extent with a part of the body such as an arm on the bed and on the load on the bed. That is, the freedom of body freedom by the net is loose, and the substantial work space is expanded. As a result, workability on a narrow limited bed is improved. Furthermore, since the restraint of freedom of the body is gentle, the mental pressure of the person who performs work on a narrow carrier is reduced. This also contributes to the improvement of workability.

  Moreover, since the fall prevention apparatus by this structure uses the lightweight member called a net | network as a member which receives the body of a person, it is lightweight also as the whole apparatus. Moreover, since the column can be attached and detached, the fall prevention device can be removed while the cargo vehicle is traveling. Due to its light weight, the fall prevention device can be disassembled and loaded on a cargo vehicle when not in use.

  In addition, since the net can be arbitrarily deployed between struts having a smaller interval than its own length, the same fall prevention device can be installed in various cargo vehicles having different cargo bed sizes. . Therefore, it is necessary to prepare a set of members for the fall prevention device before assembly, that is, an assembly kit for the fall prevention device, at the work site where various types of vehicles enter and load and unload the load. Is also possible.

Note that “between each of the plurality of struts and any one of the plurality of struts adjacent to each of the struts along the outer peripheral portion” is adjacent to the outer peripheral portion. It is not necessarily required to be between all pairs. For example, when the plurality of support columns are four support columns erected at portions corresponding to the four corners of the loading platform, a net is developed between the left and right front and rear sets, and the right and left front and rear The net is only developed between the sets, and the net does not have to be developed between the front left and right set and between the rear left and right set. That is, it is sufficient that a net is developed between each of the plurality of support columns and any of the support columns adjacent along the outer peripheral portion.

The invention according to claim 2 is the fall prevention device according to claim 1 , wherein any one of the plurality of columns and the plurality of columns adjacent to the columns along the outer peripheral portion . Further, a linear body spanned at two or more different heights is provided between the struts, and the net is developed between the linear bodies having different heights.

According to this structure, the net | network is expand | deployed above the outer peripheral part of the cargo bed by the linear body spanned between the group of the support | pillar standing adjacent to the outer peripheral part of the cargo bed. For this reason, the operation | work which expand | deploys a net | network between support | pillars can be performed easily. Further, it is possible to easily apply tension to the net as necessary. In addition, the linear body can be arbitrarily routed between struts that are narrower than its own length, so the same fall prevention device should be installed in various cargo vehicles with different cargo bed sizes. Not disturb.

In this configuration, the “net deployed between the linear bodies ” does not necessarily require that the net is stretched in a tensioned state. For example, it may be gently developed between the linear bodies in a state where the net hangs down. Furthermore, the linear body in the present invention, strength, flexibility, although the preferred aspects or Lalo-loop, such as easy to handle thickness, not rope or rope only includes wires, to belts, similar to the rope It is a general term for linear materials that can be used in the present invention.

The invention according to claim 3 is the fall prevention device according to claim 2, wherein each of the plurality of support columns has an annular member for attaching the linear body to two or more portions having different heights. Is.

According to this arrangement, two or more regions of different respective strut height, since it has an annular member for mounting the linear members, struts linear body by attaching a linear body in the annular member Can be easily attached to.

  The invention according to claim 4 is the fall prevention device according to claim 3, wherein the two or more parts are three or more parts having different heights.

According to this configuration, three or more different sites of each strut height, since it has an annular member for mounting the linear body, by selecting an annular member for mounting a linear body, a linear You can easily change the height of your body .

The invention according to claim 5 is the fall prevention device according to claim 3 or 4, wherein each of the linear bodies is supported by the annular member in a detachable manner via a carabiner.

According to this configuration, the linear body, since it is detachably supported to the annular member through the carabiner, mounting work and removing work of the linear body to the corresponding strut is facilitated.

A sixth aspect of the present invention is the fall prevention device according to any one of the second to fifth aspects, wherein one end of each linear body is supported by a corresponding support via a tensioner. It is.

According to this configuration, one end of each linear body is because it is supported by a strut corresponding through tensioner, work tasks and loosening tensioning the linear member is facilitated.

The invention according to claim 7 is the fall prevention device according to any one of claims 2 to 6, wherein the net is detachably attached to the linear bodies having different heights via a carabiner. Is.

According to this configuration, since the net is detachably attached to the linear body via the carabiner, the work for attaching and removing the net to the linear body is facilitated.

The invention according to claim 8 is the fall prevention device according to any one of claims 2 to 7, wherein the plurality of support columns are erected at portions corresponding to at least four corners of the cargo bed, Is deployed at least on the left and right sides of the loading platform, and among the four struts erected at the portions corresponding to the four corners of the loading platform, the one that is erected at the left front portion and the right front portion. A linear body is also stretched between the one provided and the one erected on the left rear part and the one erected on the right rear part.

According to this structure, the linear body is spanned between the struts erected at the portions corresponding to the four corners of the loading platform between the struts adjacent in both directions along the outer periphery. For this reason, when the net receives the personnel's body, the load is distributed to all four columns. That is, since the four struts cooperate to support the load acting on a part of the net, concentration of the load on one strut is reduced. For this reason, safety is further improved.

  A ninth aspect of the present invention is the fall prevention device according to any one of the first to seventh aspects, wherein the plurality of support columns are erected at portions corresponding to at least four corners of the loading platform. .

  According to this configuration, since the plurality of support columns are erected at portions corresponding to the four corners of the loading platform, the net is widened on at least two of the outer circumference of the loading platform, that is, the left side, the right side, the rear side, and the front side. It becomes possible to expand. In the present invention, the “four corners of the loading platform” need only be substantially four corners of the loading platform, and does not need to be the four corners of the loading platform accurately and geometrically.

  A tenth aspect of the present invention is the fall prevention device according to the ninth aspect, wherein the net is developed at least on the left and right sides of the loading platform.

  According to this configuration, since the net is deployed on the left and right sides of the loading platform with the highest risk of falling, a high fall prevention effect can be obtained.

  The invention according to claim 11 is the fall prevention device according to claim 10, wherein the net is also developed behind the cargo bed.

  According to this configuration, since the net is also deployed behind the loading platform, the fall prevention effect is further enhanced.

  A twelfth aspect of the present invention is the fall prevention device according to the tenth or eleventh aspect, wherein the net is also deployed in front of the loading platform.

  According to this configuration, since the net is also deployed in front of the loading platform, the fall prevention effect is further enhanced. When the freight vehicle is a truck, a torii is provided in front of the loading platform, and this torii is expected to contribute to a certain extent to prevent falling. However, since the torii is as rigid as the fence in the prior art, safety can be improved by providing a net in front. Furthermore, when personnel work on the platform at a height exceeding the torii, safety is particularly enhanced by deploying a net in front of the platform.

  A thirteenth aspect of the present invention is the fall prevention device according to any one of the first to twelfth aspects, wherein each of the plurality of support columns is extendable.

  According to this structure, since each support | pillar can be expanded-contracted, the height of a net | network can be adjusted by adjusting the expansion / contraction degree of each support | pillar.

  A fourteenth aspect of the present invention is the fall prevention device according to any one of the first to thirteenth aspects, wherein the plurality of support columns are attached to a floor plate of the cargo bed.

  According to this configuration, since the plurality of support columns are attached to the floor plate of the loading platform, these columns can be erected even for a vehicle having no loading platform.

  A fifteenth aspect of the present invention is the fall prevention device according to the fourteenth aspect, wherein the plurality of support columns are attached to the floor board by inserting lower end portions into holes provided in the floor board. is there.

  According to this configuration, since the plurality of support columns are attached to the floor plate by inserting the lower end portions into the holes provided in the floor plate of the loading platform, the upright operation of the support column is facilitated.

  The invention according to claim 16 is the fall prevention device according to claim 15, wherein each of the plurality of support columns has a protruding portion that abuts against an edge of the hole on a side surface near its lower end. .

  According to this configuration, each support column has the protruding portion that abuts against the edge of the hole on the side surface in the vicinity of the lower end thereof, so that each support column can be easily erected at a predetermined height.

  The invention according to claim 17 is the fall prevention device according to any one of claims 1 to 13, wherein the plurality of support columns are attached to a ridge of the cargo bed.

  According to this configuration, since the plurality of support columns are attached to the luggage rack, it is possible to secure a wide floor area of the luggage bed on which the load can be loaded.

  The invention according to claim 18 is the fall prevention device according to claim 17, wherein each of the plurality of support columns is detachably attached to the saddle, and a lower end is detachable from the pedestal portion. And a columnar part that is erected on the pedestal part by being attached.

  According to this structure, each support | pillar can be erected by attaching a pedestal part to a collar and then attaching a columnar part to the pedestal part. That is, since each column can be erected step by step, the column erection operation is facilitated.

  The invention according to claim 19 is the fall prevention device according to claim 18, wherein the pedestal portion clamps and clamps one principal surface and the other principal surface of the collar across the edge of the collar. Thus, it has a clamp structure fixed to the ridge.

  According to this configuration, since the pedestal portion has a clamp structure that is fixed to the heel by clamping and sandwiching both main surfaces of the heel over the heel, the pedestal portion can be processed without being processed into the heel. Can be installed on the fence.

  The invention according to claim 20 is the fall prevention device according to claim 19, wherein the clamp structure is a contact member that comes into contact with the end edge, and a screw that advances and retreats toward the one main surface with rotation. A member that is connected to the contact member and is screwed to the screw to support the screw; a pressing member that is connected to the contact member and contacts the other main surface; and the screw A pressing member that is attached to the end of the screw and abuts against the one main surface by advancing the screw and presses the one main surface, thereby tightening the one main surface and the other main surface in cooperation with the pressing member And.

  According to this configuration, the clamp structure is positioned at the edge by the contact member. Further, by rotating the screw, the screw can be advanced to press the pressing member against one main surface of the heel. Thereby, since a press member and a pressing member will clamp both main surfaces of a scissors, a clamp structure is fixed to a scissors. Thus, according to this structure, a base part can be easily attached to a collar by rotating a screw.

  The invention according to claim 21 is the fall prevention device according to claim 20, wherein the pressing member is freely restrained in the rotational direction of the screw and allowed to play in the axial direction of the screw, An engaging member that engages with the screw, and an elastic member that is attached to a side of the engaging member that faces the one main surface.

  According to this configuration, when the screw is rotated, the pressing force is transmitted to the elastic member through the engaging member engaged with the screw, and the elastic member presses one main surface of the heel. For this reason, it is possible to tighten the scissors without damaging the main surface of the scissors. Further, since the engaging member engages with the screw freely in the rotation direction of the screw, the screw can be smoothly rotated. Further, since the rotation of the elastic member accompanying the rotation of the screw is suppressed, the elastic member is hardly worn and the main surface of the ridge is not easily damaged. Further, since the engaging member is restrained while allowing play in the axial direction of the screw, when the screw is rotated in the loosening direction, even after releasing the pressing state of the heel by the pressing member, the screw is retracted. The pressing member does not leave the screw. For this reason, the workability | operativity at the time of attaching or removing a base part is improved. Note that “while allowing play” means that there may or may not be play.

  According to a twenty-second aspect of the present invention, in the fall prevention device according to the twenty-first aspect, a center portion of the tip of the screw protrudes, and a top portion of the protruding portion abuts against a part of the engaging member to press. By doing so, a pressing force is applied to the engaging member.

  According to this configuration, since the tip of the screw protrudes at the center portion, and the top portion of the protruding portion comes into contact with and presses a part of the engaging member, a pressing force is applied to the engaging member. The screw can be rotated more smoothly. Moreover, the rotation of the elastic member accompanying the rotation of the screw can be further suppressed.

  The invention according to claim 23 is the fall prevention device according to claim 21 or 22, wherein the clamp structure restrains the rotation of the engagement member around the axis of the screw, and It further has a guide member that guides it slidably in the axial direction of the screw.

  According to this configuration, since the rotation of the engaging member is restrained by the guide member, the rotation of the elastic member accompanying the rotation of the screw can be reliably restrained.

  The invention according to claim 24 is the fall prevention device according to any one of claims 20 to 23, wherein the clamp structure includes the abutting member, the screw, the screw supporting portion, the pressing member, and the pressing member. A set with a member is provided at a plurality of sites along the edge of the ridge.

  According to this structure, since the several site | part along the edge of a collar is clamp | tightened with a pressing member and a pressing member, a base part is stably fixed to a collar.

  The invention according to claim 25 is the fall prevention device according to any one of claims 19 to 24, wherein the clamp structure is a square member having a cross-sectional dimension of 50 mm x 50 mm along the edge of the flange. In a state where the bulge is held, the ridge can be sandwiched.

  According to this configuration, since the clamp structure has a shape that can hold the ridge in a state of holding a square-shaped bulge having a cross-sectional dimension of 50 mm × 50 mm along the edge of the ridge, the clamp structure is a commercially available track. It becomes possible to deal with almost all the traps.

  The invention according to claim 26 is the fall prevention device according to any one of claims 19 to 25, wherein the pedestal portion is a member connected to the clamp structure or a member constituting a part of the clamp structure. And a cylindrical receiving portion that supports the columnar portion by receiving the insertion of the lower end portion of the columnar portion.

  According to this configuration, the columnar portion can be erected by inserting the lower end portion of the columnar portion into the cylindrical receiving portion as a member constituting the clamp structure or a member constituting a part of the clamp structure. The columnar part is stably supported, and the work of raising the columnar part is facilitated.

  A twenty-seventh aspect of the present invention is the fall prevention device according to the twenty-sixth aspect, wherein the receiving portion has a bottom.

  According to this structure, since the receiving part which should insert the lower end part of a columnar part is bottomed, when raising a columnar part, the depth which should insert a columnar part is decided with a bottom. For this reason, the columnar portion can be raised to a predetermined height by a simple operation.

  The invention according to claim 28 is the fall prevention device according to claim 26 or 27, wherein the member is detachably connected between the pedestal part and the columnar part attached to the pedestal part. A reinforcing member that restrains tilting of the columnar portion around the receiving portion with tension is further provided.

  According to this configuration, since the reinforcing member is provided, the strength against the load that is generated when the net receives the body of the person and that tries to tilt the columnar portion around the receiving portion is increased. Since the reinforcing member is detachable, it does not hinder the incorporation and removal of the columnar part from the pedestal part.

  A twenty-ninth aspect of the present invention is the fall prevention device according to the twenty-sixth or twenty-seventh aspect, wherein the collar and the columnar portion attached to at least one pedestal portion of the plurality of support columns are detachably connected. And a reinforcing member that restrains the tilt of the columnar portion around the receiving portion with tension.

  According to this configuration, since the reinforcing member is provided, the strength against the load that is generated when the net receives the body of the person and that tries to tilt the columnar portion around the receiving portion is increased. Since the reinforcing member is detachable, it does not hinder the incorporation and removal of the columnar part from the pedestal part.

  A thirty-third aspect of the present invention is the fall prevention device according to the twenty-ninth aspect, wherein the pedestal portion of the at least one support column is attached to a side rod, and one end of the reinforcing member is attached to a rear rod. Is.

  According to this configuration, since the columnar portion supported by the pedestal portion attached to the side rod is reinforced by the reinforcing member attached at one end to the rear rod, it occurs when the net receives the body of the person. It is a load, and the intensity | strength with respect to the load which tries to incline a columnar part sideward around a receiving part is raised.

  A thirty-first aspect of the invention is the fall prevention device according to any one of the twenty-eighth to thirty-third aspects, wherein the reinforcing member has a turnbuckle for generating the tension.

  According to this configuration, since the reinforcing member has the turnbuckle, the tension by the reinforcing member can be easily adjusted.

  A thirty-second aspect of the present invention is the fall prevention device according to any one of the twenty-sixth to thirty-first aspects, wherein the columnar portions of the plurality of struts have a protrusion on the side surface near the lower end portion of the column. .

  According to this configuration, since each columnar part has a protrusion on the side surface near the lower end, it is inserted into a mounting hole for a load collapse prevention column provided on the loading platform of the trailer vehicle, and the protrusion is used as an edge of the hole. By abutting, the columnar part can be erected on the loading platform at a predetermined height. Thereby, it becomes possible to divert the columnar part as a column for preventing collapse of the cargo bed of the trailer vehicle. Moreover, each columnar part can also be used as a column of the fall prevention device according to claim 16.

  A thirty-third aspect of the invention is the fall prevention device according to any one of the thirteenth to thirty-second aspects, wherein the pedestal portion stands the columnar portion when the heel is closed upward. It is what makes it possible.

  According to this configuration, since the pedestal portion allows the columnar portion to stand when the heel is closed upward, the column can be erected on the heel closed upward.

  A 34th aspect of the present invention is the fall prevention device according to any one of the 19th to 32nd aspects, wherein the pedestal portion raises the columnar portion when the heel is in a state of hanging downward. Is possible.

  According to this configuration, since the pedestal portion allows the columnar portion to stand when the heel is in a state of hanging downward, it is possible to stand the column on the heel hanging downward. it can. The heel does not open much more than it hangs down. For this reason, the tilting of the columnar part due to the load generated when the net receives the body of the person can be stably regulated by the scissors.

  A thirty-fifth aspect of the present invention is a freight vehicle comprising the fall prevention device according to any one of the first to thirty-fourth aspects.

  According to this configuration, since the cargo vehicle includes the fall prevention device of the present invention, workability and safety on the loading platform can be improved. Moreover, since the fall prevention device is lightweight and easy to handle, it can be easily attached to and detached from the vehicle.

  A thirty-sixth aspect of the invention is a freight vehicle to which the fall prevention device according to any one of the first to thirteenth and seventeenth aspects can be attached, and supports the strut by accepting insertion of a lower end portion of the strut. A cylindrical receiving portion is provided on the luggage ridge.

  According to this configuration, since the freight vehicle has the cylindrical receiving portion that supports the support column of the fall prevention device of the present invention at the foot of the loading platform, the support column can be easily inserted by inserting the support column into the reception unit. Can be erected.

The invention according to claim 37 is the method of assembling the fall prevention device according to any one of claims 2 to 8, wherein the plurality of struts are detachably erected on the outer periphery of the cargo bed. And a linear body that supports at least both ends of the net is spanned between each of the plurality of support columns and the support column adjacent to each of the support columns at two or more different heights along the outer peripheral portion. And a net expanding step of expanding the net above the outer periphery of the loading platform.

According to this structure, a support | pillar can be erected on the outer peripheral part of a cargo bed by a support | pillar standing-up process, and a net | network can be expand | deployed above the outer peripheral part of a cargo bed by a net | network expansion | deployment process. That is, the fall prevention device of the present invention can be attached to the cargo bed of the cargo vehicle. Moreover, the net can be easily developed by spanning the linear bodies that support both ends of the net between the corresponding columns.

As described above, according to the assembling method of the fall prevention device, cargo vehicle, and fall prevention device of the present invention, workability and safety on the loading platform can be improved, and handling properties can also be improved. .

(Overall configuration of the device)
FIG. 1 is a schematic side view of a freight vehicle including a fall prevention device according to an embodiment of the present invention. The cargo vehicle 600 is embodied as a large truck. A fall prevention device 500 is detachably installed on the loading platform 1 of the cargo vehicle 600. The fall prevention device 500 includes a plurality of struts 10, a net 20, and ropes 30 and 31 as main members. The column 10 includes a columnar part 40 and a pedestal part 50. The pedestal portion 50 is detachably attached to the edge of the bag 2 of the loading platform 1 by a clamp mechanism. The columnar part 40 is stood by attaching a lower end part to the base part 50 so that attachment or detachment is possible. Thereby, the column 10 is erected on the outer peripheral portion of the loading platform 1.

  At least two struts 10 are erected. In the following description, an example in which four struts 10 are erected at the four corners of the loading platform 1 will be taken up. In FIG. 1, only a support column 10 (represented by reference numeral 10 </ b> A as necessary) provided on the left front side of the loading platform 1 and a support column 10 (represented by reference numeral 10 </ b> B as necessary) provided on the left rear side are illustrated. . Since the fall prevention device 500 is configured similarly to the left side on the right side of the loading platform 1, only the configuration on the left side will be described as a representative.

  A rope 30 and a rope 31 are stretched between the support 10A and the support 10B. The rope 30 is supported near the lower ends of the columns 10A and 10B, and the rope 31 is supported on the upper ends of the columns 10A and 10B. More specifically, the rope 30 is supported by the pedestal portion 50 along the edge of the rod 2, and the rope 31 is supported by the top of the columnar portion 40. As will be described later, both ends of the ropes 30 and 31 are detachably supported by the columns 10A and 10B via carabiners. Furthermore, one end of the ropes 30 and 31 is supported by the support 10A through a tensioner together with a carabiner. Thereby, both the ropes 30 and 31 are stretched between the support column 10A and the support column 10B in a tension state.

  The net | network 20 is expand | deployed between the support | pillar 10A and the support | pillar 10B by expand | deploying between the rope 30 and the rope 31. FIG. More specifically, the upper end of the net 20 is supported by the rope 31 and the lower end is supported by the rope 30. The rope 31 is provided in order to suspend the net 20, and the rope 30 is provided in order to avoid a gap that allows a person to slip through the net 20 and the rod 2. As will be described later, the net 20 is detachably attached to the ropes 30 and 31 via a carabiner. FIG. 1 shows an example in which the net 20 is deployed between the rope 30 and the rope 31 in a state where the net 20 hangs gently, but may be deployed in a tensioned state as will be described later. For example, the lateral end of the mesh 20 is a string (string) so that the mesh 20 is free to move horizontally along the ropes 30 and 31 so that a large gap is not formed between the mesh 20 and the supports 10A and 10B. ) It is desirable to be connected to the pillars 10A and 10B with 25 or the like.

  Since the cargo vehicle 600 includes the fall prevention device 500 configured as described above on the loading platform 1, a person working on the loading platform 1 falls outside the loading platform 1 as described in detail later. Can be prevented.

(Configuration of each part of the device)
Next, details of each part of the fall prevention device 500 will be described with reference to FIGS. FIG. 2 is a front view showing the overall configuration of the column 10. As described above, the column 10 includes the columnar portion 40 and the pedestal portion 50. In the following example, the main part of the support column 10 is made of steel, but a light metal, for example, an aluminum alloy may be used as a material in order to further reduce the weight.

  The columnar portion 40 is supported and fixed to the pedestal portion 50 by inserting a lower end into a receiving portion (not shown) of the pedestal portion 50. In the following example, the columnar section 40 is embodied as a hollow prism. An annular member 13 is attached to the top of the columnar portion 40 by welding, for example. Further, a pair of fin-shaped protrusions 12 are attached to the vicinity of the center of the columnar part 40 by, for example, welding. The pair of annular members 11 are attached to the pedestal portion 50 by welding, for example. The annular members 11 and 13 are provided as members for attaching the ropes 30 and 31, respectively. Moreover, the hole is formed in the projection part 12, and the projection part 12 contains an annular member by it. A rope for suspending the net 20 can also be attached to the annular member defined by the protrusion 12. As an object to which a rope for suspending the net 20 is attached, two types of an annular member 11 and a protruding portion 12 can be selected, and thereby the height of the net 20 can be changed.

  A pair of reinforcing members 360 are preferably detachably connected between the pair of protrusions 12 and the base 50. In addition to the hole for attaching the rope, the protrusion 12 is formed with a hole for attaching one end of the reinforcing member 360. In addition, a pair of protrusions 56 in which holes are formed are attached to the pedestal 50 by, for example, welding. Both ends of the reinforcing member 360 are attached to the protrusions 12 and 56 by bolts that are inserted into these holes and tightened with nuts. The pair of reinforcing members 360 are provided on both sides of the columnar portion 40 so as to be symmetrical. A turnbuckle 361 is interposed in the reinforcing member 360, and tension can be applied to the reinforcing member 360 by rotating the turnbuckle.

  The reinforcing member 360 functions to reinforce the columnar portion 40 by connecting the columnar portion 40 and the pedestal portion 50 with tension. When the net 20 receives the body of a person who is about to fall, shocking tension is applied to the ropes 30 and 31. As a result, a force for pulling down the rope 30 in the direction in which the rope 30 is stretched acts on the columnar portion 40 that supports the rope 31. That is, a load for tilting the columnar portion 40 around the receiving portion of the pedestal portion 50 that supports the lower end portion of the columnar portion 40 is generated. The reinforcing member 360 relieves a large moment applied to the lower end portion of the reinforcing member 40 and the receiving portion of the pedestal portion 50 by adding a reaction to the load to the columnar portion 40 and restrains the tilting of the columnar portion 40. . That is, the reinforcing member 360 serves to increase the strength of the entire support column 10 against a load that tends to tilt the columnar section 40.

  FIG. 3 is a perspective view showing the configuration of the pedestal portion 50. The pedestal portion 50 includes a trunk portion 200 that is a portion that rests on the edge of the collar 2, and four leg portions 201 to 204 that project downward from the trunk portion 200 so as to sandwich the collar 2. The trunk | drum 200 and the leg parts 201-204 are integrally connected by welding. The pair of leg parts 201 and 202 facing each other and the pair of leg parts 203 and 204 facing each other are positioned at two positions along the edge of the heel 2 so that the left and right end parts of the trunk part 200 It is linked to.

  The body portion 200 includes a front plate 51, a back plate 52, a pair of connection plates 55, a pair of connection plates 57, and a contact plate 59. The front plate 51 and the back plate 52 that are paired in the front-rear direction are connected by a pair of connecting plates 55, a pair of connecting plates 57, and a contact plate 59. These are connected together by welding. The contact plate 59 corresponds to a specific example of the contact member of the present invention, and plays a role of positioning the pedestal 50 on the edge of the flange 2 by contacting the edge of the flange 2. The pair of connecting plates 55 functions as a base for fixing the protruding portion 56 and the annular member 11. The pair of connecting plates 57 constitutes a cylindrical receiving portion 205 in cooperation with the front plate 51 and the back plate 52, and receives the insertion of the lower end portion of the columnar portion 40, thereby supporting the columnar portion 40 in a fixed manner. Fulfills the function of Of the front plate 51 and the back plate 52, a pair of holes 58 for inserting bolts for preventing the columnar portion 40 from being inserted is formed in a portion corresponding to the receiving portion 205.

  As shown in the partial sectional view of FIG. 4, the receiving portion 205 is bottomed by the contact plate 59. When the lower end portion of the columnar portion 40 is inserted into the receiving portion 205, the columnar portion 40 is positioned by the contact plate 59. In this state, a hole 58 formed in the front plate 51 and the back plate 52 and a pair of holes 41 formed in the lower end portion of the columnar portion 40 overlap each other. As a result, one bolt can be easily inserted into the hole 58 and the hole 41. By tightening the inserted bolt with a nut, the columnar portion 40 can be prevented from coming out of the receiving portion 205.

  Returning to FIG. 3, each of the left and right leg parts 201 and 203 has a pair of leg plates 53, a screw support part 60, a pressing member 61, a screw 63, and a handle 64. The pair of leg plates 53 are integrally connected to the front plate 51 and the contact plate 59 of the trunk portion 200 by welding. The screw support portion 60 is a member that supports the screw 63 by screwing, and is fixed by being sandwiched between a pair of leg plates 53. The pair of leg plates 53 and the screw support portion 60 are integrally connected by welding. In FIG. 3, the support 60 is embodied by a commercially available nut. Further, the pair of leg plates 53 are fastened by bolts and nuts, thereby increasing the strength against an external force that increases the distance between each other. A lever 64 for rotating the screw 63 manually is attached to the base end portion of the screw 63. On the other hand, a pressing member 61 is attached to the tip of the screw 63 to abut against the outer main surface of the flange 2 by advancing with the rotation of the screw 63 and press the outer main surface.

  Each of the left and right leg portions 202 and 204 has a pair of leg plates 54 and a pressing plate 65. The pair of leg plates 54 are integrally connected to the back plate 52 and the contact plate 59 of the trunk portion 200 by welding. The pressing plate 65 is located at a position facing the pressing member 61 and is fixed by being sandwiched between a pair of leg plates 54. The pair of leg plates 54 and the pressing plate 65 are integrally connected by welding. Similarly to the pair of leg plates 53, the pair of leg plates 54 are fastened by bolts and nuts, thereby increasing the strength against an external force that widens the distance between them. The pressing plate 65 corresponds to a specific example of the pressing member of the present invention, and cooperates with the pressing member 61 to play a role of tightening the outer main surface and the inner main surface of the flange 2. Note that the main surface of the rod 2 facing the outside of the loading platform 1 when the rod 2 is closed upward is referred to as an outer main surface, and the main surface facing inward is referred to as an inner main surface. As described above, the pedestal portion 50 has a clamp structure.

  FIG. 5 is an explanatory diagram showing a mounting state of the pedestal portion 50 to the flange 2. As shown in FIG. 5, the pedestal portion 50 having a clamp structure has an edge of the heel 2 when the heel 2 connected to the floor plate 3 of the loading platform 1 via the hinge 5 is closed upward. Attached to straddle. When the screw 63 is rotated to the right by manually operating the handle 64, the screw 63 advances and the pressing member 61 contacts the outer main surface of the heel 2 to press the outer main surface. At the same time, the pressing plate 65 facing the pressing member 61 abuts against the inner main surface of the flange 2 and presses the inner main surface. Thus, the base part 50 which has a clamp structure is fixed to the edge of the collar 2 by clamping and pinching the outer main surface and inner main surface of the collar 2. Therefore, it is possible to attach the pedestal portion 50 to the heel 2 without performing any processing on the heel 2.

  Some commercially available truck ridges 2 have square-shaped bulges along their edges. Of all the 100 types of commercial trucks investigated by the inventors of the present application, the cross-sectional dimension of the bulge is less than 50 mm with respect to the thickness of the heel 2 and the width from the edge of the heel 2 It was 50 mm or less. Therefore, the distance X between the leg plate 53 and the leg plate 54 facing each other is set to 50 mm or more, and the distance Y between the surface where the contact plate 59 contacts the edge of the flange 2 and the pressing member 61 is set to 50 mm or more. desirable. In other words, the pedestal portion 50 has a shape that can hold the heel 2 while holding the bulge so as not to interfere with the square-shaped bulge having a cross-sectional dimension of 50 mm × 50 mm that the heel 2 has along the edge. Is desirable.

  Some trucks have a ridge 2 that does not have a bulge at the edge, as depicted by the dotted line in FIG. The pedestal 50 configured not to interfere with the bulge can be attached to the heel 2 having no bulge without any problem. Further, the thickness of the heel 2 having no bulge was less than 50 mm as far as the above investigation was concerned. Therefore, the pedestal portion 50 having the intervals X and Y of 50 mm or more can be attached to all the cages 2 of the commercially available truck as long as the investigation is performed. That is, it can be said that this pedestal 50 is applicable to virtually all trucks in the country.

  The pressing member 61 includes an engaging member 66 that engages with the screw 63 and an elastic member 67 that is attached to the engaging member 66. When the screw 63 is rotated clockwise, a pressing force is transmitted to the elastic member 67 through the engaging member 66. The elastic member 67 abuts on the outer main surface of the flange 2. For this reason, the base part 50 can clamp the collar 2 without damaging the outer main surface of the collar 2. In addition, since the fastening force is stably maintained by the elastic restoring force of the elastic member 67, the pedestal portion 50 is stably fixed to the flange 2. The elastic member 67 is made of, for example, rubber, and more preferably, urethane that can obtain high strength.

  FIG. 6 is a partial cross-sectional view showing the structure of the pressing member 61. In FIG. 6, the engaging member 66 is embodied as a rectangular parallelepiped having a hollow inside. The screw 63 passes through the front wall of the engaging member 66, and the tip of the screw 63 faces or abuts on the inner surface of the back wall located on the opposite side of the front wall. An elastic member 67 is attached to the outer surface of the back wall facing the tip of the screw 63. The elastic member 67 is fixed to the back wall with, for example, a screw (not shown). A locking member 70 is attached to the screw 63 by welding, for example. The locking member 70 is, for example, an annular member. In FIG. 6, a washer is used as the locking member 70.

  The engaging member 66 is rotatable with respect to the screw 63. Thereby, the screw 63 can be smoothly rotated. In particular, the tip of the screw 63 protrudes at the central portion, and the top of the protruding portion abuts against and presses the central portion of the inner surface of the back wall of the engaging member 66, thereby applying a pressing force to the engaging member 66. The For this reason, the screw can be rotated more smoothly. Further, since the rotation of the elastic member 67 accompanying the rotation of the screw 63 is suppressed, there is an advantage that the elastic member 67 is not easily worn and the outer main surface of the flange 2 is not easily damaged. In particular, the pressing member 61 is slidably sandwiched between the pair of leg plates 53, whereby the rotation of the pressing member 61 is restricted by the pair of leg plates 53. That is, the pair of leg plates 53 corresponds to a specific example of the guide member of the present invention. For this reason, since the rotation of the elastic member 67 accompanying the rotation of the screw 63 is surely restricted, the wear of the elastic member 67 and the damage to the outer main surface of the flange 2 are further suppressed.

  On the other hand, the engaging member 66 is restrained in the axial direction of the screw 63 by the tip of the screw 63 and the locking member 70. For this reason, when the screw 63 is rotated counterclockwise, the pressing member 61 is not detached from the screw 63 as the screw 63 is retracted even after the pressing state of the heel 2 by the pressing member 61 is released.

  FIG. 7 is a schematic external view showing a mechanism in which the support column 10 supports the rope 31. One end of the rope 31 is detachably supported by the annular member 13 of the support 10 </ b> A via the carabiner 32. A tensioner 33 is attached to one end of the rope 31, and the rope 31 is supported by the annular member 13 via the tensioner 33 in addition to the carabiner 32.

  FIG. 8 is an external view showing the carabiner 32 and the tensioner 33 in an enlarged manner. The carabiner 32 has a ring-shaped portion, and has a lever 34 that can be opened and closed at a part of the ring-shaped portion. The lever 34 can be locked by another pin. The tensioner 33 has a lid that opens and closes. The tensioner 33 is put into use by closing the lid with the rope 31 interposed therebetween and fastening the screw 35. The tensioner 33 restrains the movement in one direction of the rope 31 and does not restrain the movement in the other direction. Therefore, after attaching the carabiner 32 to the annular member 13, the rope 31 can be tensioned with a desired strength by pulling one end of the rope 31. Further, the restraint state of the rope 31 can be released by tilting the lever 36 of the tensioner 33 in a predetermined direction. Therefore, the carabiner 32 can be easily removed from the annular member 13 by releasing the tension state of the rope 31 after the work of unloading the load on the loading platform 1 is completed.

  As illustrated in FIG. 1, the other end of the rope 31 is also detachably supported by the annular member 13 via a carabiner. The tensioner 33 may be attached to both ends of the rope 31, but if it is attached only to one end as shown in FIG. 1, it is sufficient to apply tension to the rope 31. The rope 30 is detachably supported by the annular members 11 (see FIG. 2) of the support columns 10A and 10B by a mechanism similar to the support mechanism of the rope 31.

  As described above, since the ropes 31 and 30 are supported by the support pillars 10A and 10B via the carabiner 32, the attachment work and the removal work of the ropes 31 and 30 to the support pillars 10A and 10B can be easily performed. . Further, since one end of each of the ropes 31 and 30 is supported by the support column 10A via the tensioner 33, a desired tension can be applied to the ropes 31 and 30. Further, by releasing the tension, the ropes 31 and 30 can be easily detached from the columns 10A and 10B.

  FIG. 9 is an enlarged external view showing a mechanism in which the rope 31 supports the net 20. A thread or rope 21 and a rope 31 along the edge of the net 20 are detachably connected by a carabiner 22. In the carabiner 22 depicted in FIG. 9, the openable / closable lever can be locked by a hook-shaped protrusion provided on a part of the ring-shaped portion. The carabiner 22 is attached to the rope 21 at an appropriate interval. The rope 30 supports the net 20 by a mechanism similar to the mechanism in which the rope 31 supports the net 20. Thus, since the net | network 20 is detachably attached to the ropes 31 and 30 via the carabiner 22, the attaching operation | work to the ropes 31 and 30 of the net | network 20 and a removal operation | work can be performed easily.

  8 and 9 exemplify carabiners having a specific structure, but carabiners having other structures may be used as long as they are detachably connected.

(Device assembly method)
10 to 14 are process diagrams showing a process of assembling the fall prevention device 500 on the loading platform 1. These steps can be performed by personnel. In order to assemble the device 500, first, as shown in FIG. Here, the base part 50 shall be attached to the four corners of the loading platform 1. In order to attach the pedestal portion 50, the body portion 200 is placed on the heel 2 so that the contact plate 59 (see FIG. 3) is brought into contact with the edge of the heel 2. Thereafter, the pair of handles 64 are rotated to the right so that the legs 201 to 204 tighten the outer main surface and the inner main surface of the heel 2. Thereby, the base part 50 is fixed to the eaves 2.

  Next, as shown in FIGS. 11 and 12, the columnar portion 40 is attached to each pedestal portion 50. In order to attach the columnar portion 40 to the pedestal portion 50, the columnar portion 40 is lifted on the loading platform 1 in an upright state, and the lower end portion thereof is inserted into the receiving portion 205 (see FIG. 4) of the pedestal portion 50. Thereafter, a bolt is inserted into the hole 58 and the hole 41, and the bolt is tightened with a nut, whereby the columnar part 40 can be brought upright on the base part 50. Thereafter, the reinforcing member 360 is attached to the columnar portion 40 and the pedestal portion 50 using bolts and nuts. Subsequently, a tension is applied to the reinforcing member 360 by rotating the turnbuckle 361 (see FIG. 2) of the reinforcing member 360. Through the above steps, the column erecting step for erecting the column 10 on the outer periphery of the loading platform 1 is completed. In addition, as shown in FIG. 12, the support | pillar 10 provided in the right front of the loading platform 1 is represented by the code | symbol 10C as needed, and the support | pillar 10 provided in the right rear is represented by the code | symbol 10D as needed. Further, the heel 2 is described as a left heel 2L, a right heel 2R, and a rear heel 2B when it is particularly necessary to distinguish them.

  Next, as shown in FIG. 13, an operation of expanding the net 20 between the support 10A and the support 10B is performed. One end edge of the net 20 is attached to the rope 30 via a carabiner 22 (see FIG. 4), and the other end edge is attached to the rope 31 via a carabiner 22. In the example of FIG. 13, the vicinity of the center of the both end edges of the mesh 20 is attached to the rope 37 via the carabiner 22 in order to make it possible to adjust the height at which the mesh 20 is developed. In this way, the ropes 30 and 31 are attached to the net 20 and, if necessary, the rope 37 is attached in advance. Further, a carabiner 32 and a tensioner 33 (see FIG. 8) are attached to the ropes 30, 31 and 37 in advance.

  In order to unfold the net 20, first, the ropes 30 and 31 are attached to the annular members 13 and 11 (see FIG. 2) of the columns 10A and 10B via the carabiner 32 (see FIG. 7). FIG. 13 illustrates a state after attachment. Then, tension | tensile_strength is provided to the ropes 30 and 31 by pulling the edge part of the ropes 30 and 31 in the side to which the tensioner 33 is attached, and the ropes 30 and 31 will be in a tension | tensile_strength state.

  Next, returning to FIG. 1, the horizontal end of the net 20 is connected to the support columns 10 </ b> A and 10 </ b> B with a string (string) 25 or the like. Through the above steps, the net unfolding step for unfolding the net 20 between the columns 10A and 10B as shown in FIG. 1 is completed. The net 20 can be developed between the columns 10C and 10D through the same net development process. Moreover, as shown in FIG. 14, the net | network 20 can be expand | deployed also between the support | pillar 10B and the support | pillar 10D, ie, the back of the loading platform 1, through the same process. Moreover, although illustration is abbreviate | omitted, the net | network 20 can be expand | deployed also between the support | pillar 10A and the support | pillar 10C, ie, the front of the loading platform 1, through the same process. As described above, the fall prevention device 500 can be installed on the loading platform 1 by a simple manual operation.

(Function and advantage of the device)
FIG. 15 is a schematic explanatory diagram illustrating functions and advantages of the fall prevention device 500. When the cargo vehicle 600 piled with the load 90 enters the unloading work place, the fall prevention device 500 is installed on the loading platform 1 according to the steps shown in FIGS. Thereby, the net | network 20 is expand | deployed above the outer peripheral part of the loading platform 1. FIG. Then, as shown in FIG. 15, the operation | work which unloads the heavy load 90 from the loading platform 1 using a crane is performed. In FIG. 15, H-shaped steel is depicted as an example of the load 90.

  When unloading the load 90 from the loading platform 1 using a crane, as shown in FIG. 15, a person 100 climbs on the loading platform 1 or the loading object 90 and uses a lifting tool such as a wire rope. Thus, it is necessary to prepare for hanging the load 90 on the hook 91, or to perform a work (a so-called sling) such as making a signal and lifting the load 90 at a predetermined position. At this time, as shown schematically in FIG. 16, the load 100 may lose the center of gravity of the body or the scaffolding due to unexpected movement of the load 90 or the like. Even if such an unexpected situation occurs, the deployed net 20 receives the body of the personnel 100 and prevents the personnel 100 from falling from the loading platform 1.

  Further, unlike the case of using a rigid fence as in the prior art disclosed in Patent Document 1, the flexibility of the net 20 has the advantage that the impact received by the personnel 100 when receiving the body is light. It is done. Furthermore, since the net | network 20 receives a body flexibly, the danger that the personnel 100 will be pressed by the load 90 which moves unexpectedly is reduced. Further, due to the flexibility of the net 20, the personnel 100 can work on the loading platform 1 or the load 90 while pushing the net 20 to some extent with a part of the body such as an arm. That is, the freedom of body freedom by the net 20 is gradual, and the work space of the narrow and limited carrier 1 is substantially widened. Furthermore, since the restraint of freedom of the body is gentle, the mental pressure of the person 100 who works on the narrow carrier 1 is reduced. As described above, the fall prevention device 500 increases the safety on the loading platform 1 and at the same time improves the workability.

  Moreover, since the fall prevention apparatus 500 uses the lightweight net | network 20 as a member which receives the body of the personnel 100, it is lightweight also as the whole apparatus. Moreover, since the support | pillar 10 can be attached or detached, the fall prevention apparatus 500 can be removed while driving | running | working the cargo vehicle 600. FIG. Due to the light weight of the device and the indefinite shape of the mesh 20, the fall prevention device 500 can be compactly loaded on the loading platform 1 of the cargo vehicle 600 in a disassembled state when not in use.

  In FIG. 1, an example is shown in which the net 20 has a lateral length close to the interval between the column 10A and the column 10B. However, the same net | network 20 can be expand | deployed also between the support | pillar 10A and the support | pillar 10B with a narrow space | interval. In this case, the net 20 is deployed with a margin in the lateral direction, but the effect of receiving the body of the person 100 remains unchanged. Therefore, by preparing sufficiently long nets 20 and ropes 30 and 31, it is possible to install the same fall prevention device 500 in various cargo vehicles 600 having different loading platform 1 lengths. It becomes. Moreover, it is also possible to use the net | network 20 and the ropes 30 and 31 of the same dimension in the left-right side of the loading platform 1, and the front and back. Further, a set of members before assembling the fall prevention device 500 is prepared and entered at a work site where various cargo vehicles 600 having different lengths of the loading platform 1 enter and unload the load 90. It is also possible to adopt a usage pattern in which the same fall prevention device 500 is installed in the cargo vehicle 600.

  As described above, the fall prevention device 500 configured to deploy the net 20 between the pillars 10 has a simple configuration, but in various points such as safety, workability, portability, and flexibility of application. The cargo vehicle 600 is suitable for use on the loading platform 1. Moreover, since the support | pillar 10 is what is attached to the eaves 2 with the clamp structure which the base part 50 has, it is not necessary to give any processing to the commercial cargo vehicle 600. FIG. Further, since the column 10 is not supported by the floor plate 3 of the loading platform 1 but supported by the eaves 2, the floor plate 3 of the loading platform 1 can be widely used for loading the load 90.

  1 and 4 show an example in which the net 20 is deployed in front, rear, left, and right of the loading platform 1, but various deployment methods can be adopted depending on the situation of the work site and the work content. . For example, when there is a risk of falling of the personnel 100 only on the left side of the loading platform 1, the personnel 100 can be obtained by installing only the columns 10A and 10B as the column 10 and deploying the net 20 between them. It is possible to achieve the purpose of ensuring safety. Alternatively, when there is a risk of falling of the personnel 100 only on the left side and the right side of the loading platform 1, four columns 10A to 10D are erected between the columns 10A and 10B and the column 10C. It is also possible to adopt an installation form in which the network 20 is deployed only during 10D.

  As shown in FIGS. 1 and 12, a cargo vehicle 600 embodied as a truck is usually provided with a so-called torii 6 as a wall surface or a fence-like structure in front of the loading platform 1. is there. Also in the loading platform 1 provided with the torii 6, when the load 90 is piled up tall and there is a possibility that the personnel 100 may work at a height exceeding the torii 6, the net 20 is also provided in front of the loading platform 1. There is a significance to deploy. Even if there is no fear of exceeding the torii 6, it is desirable to deploy the net 20 in front of the loading platform 1 in order to reduce the impact of the body at the time of falling.

  Further, when four struts 10A to 10D are erected at the four corners of the loading platform 1 and the net 20 is deployed in four directions on the front, rear, left and right of the loading platform 1, the four supporting columns 10A to 10D are Since they are connected to each other by the rope 31, the shock load generated when the net 20 receives the body of the person 100 is distributed to all the four columns 10 </ b> A to 10 </ b> D. That is, since the four struts 10A to 10D cooperate to support a load acting on a part of the net 20, concentration of the load on any of the struts 10A to 10D is reduced. In particular, since the collar 2 has a structure that does not tilt inward beyond the state in which it is closed upward, an outward load acting on one of the left and right nets 20 can be effectively supported by the other column. . Even when the four struts 10A to 10D are erected at the four corners of the loading platform, even when the mesh 20 is deployed only on the left side and the right side of the loading platform 1, only the rope 31 is attached to the loading platform 1. By spanning forward and backward, the same load distribution effect can be obtained.

  1 and 14 show an example in which the net 20 is unfolded between the rope 30 and the rope 31 in a state where the net 20 is gently suspended. In contrast, as shown in FIG. 17, the net 20 may be deployed between the rope 30 and the rope 31 in a tensioned state. Depending on the relationship between the length of the mesh 20 in the vertical direction and the distance between the annular member 13 and the annular member 11 (see FIG. 2) attached to the support column 10, the form of deployment of the mesh 20 differs.

  When the deployment of the net 20 is excessively loose, the person 100 who is about to fall down jumps out of the loading platform 1 and is received by the net 20 near the ground. In this case, the configuration is the most excellent in that the pressure from the load 90 is avoided. On the other hand, when the net 20 is deployed in an excessively tensioned manner, the personnel 100 does not protrude from the outside of the loading platform 1, and there is an advantage that the impact of the falling is not required. The advantage of the net 20 that avoids compression is weakened compared to the case where the net 20 is loose. However, even in that case, the fall prevention device 500 has an advantage in terms of avoiding pressure as compared to a rigid fence. It is advisable to select the form of deployment of the network 20 as appropriate according to the situation at the site.

(Process to change the height of the net)
FIG. 18 is a process diagram showing an operation process for changing the height of the net 20. As the work for lowering the load 90 (see FIG. 15) piled up on the loading platform 1 proceeds, the height of the load 90 decreases. When the load 90 is lowered to a certain level or less, as shown in FIG. 18, after the rope 37 is attached to the protrusion 12 and is tensioned, the tension of the rope 31 is released, and the rope 31 is further connected to the annular member 13 (FIG. 2). As a result, as shown in FIG. 19, the mesh 20 is deployed between the rope 37 and the rope 30, and the height of the deployed mesh 20 is the center of the columnar portion 40 provided with the protrusions 12. It will be lowered to the vicinity of the club. Accordingly, it is possible to prevent the personnel 100 working on the lowered load 90 from falling, and when the load 90 is lifted by the hook 91, the load 90 in the air interferes with the net 20. This can be prevented. That is, when lifting the load 90, the restriction on the posture of the load 90 in the air is released immediately after lifting. As a result, the work efficiency of the work for lowering the load 90 is improved. Note that the rope 37 can also be hung on the support columns 10A and 10B at the same time in the process of FIG. 13 where the ropes 30 and 31 are hung.

  When loading the load 90 on the loading platform 1, it is preferable to first deploy the net 20 between the rope 30 and the rope 37 as shown in FIG. 19. As the work progresses thereafter, as shown in FIG. 18, the rope 31 is attached to the annular member 13 (see FIG. 2) and tension is applied, so that the rope 31 is stretched between the support 10A and the support 10B. good. Thereby, the net | network 20 can be expand | deployed between the rope 30 and the rope 31, as shown in FIG. In this case, the rope 37 can be left over without being removed thereafter.

(The form which added the reinforcement member)
As illustrated in FIG. 20, the support column 10 can be reinforced by the reinforcing member 110 that connects the support column 10 and the flange 2. In the example of FIG. 20, the other ends of the reinforcing members 110B and 110D each having one end attached to each of the columns 10B and 10D are attached to the rear collar 2B via clamps 111B and 111D. One end of the reinforcing member 110B is detachably attached by a bolt and a nut (not shown) to a hole provided in a projection (not shown) attached in the vicinity of the center portion of the column 10B. Further, the other end of the reinforcing member 110B is detachably attached to the clamp 111B that is detachably attached to the rear heel 2B by tightening over the end edge of the rear heel 2B. Similar to the reinforcing member 360, the reinforcing member 110B has a turnbuckle 112 that applies tension to itself. The reinforcing member 110D has a structure equivalent to that of the reinforcing member 110B, and is attached to the column 10D and the rear rod 2B by an equivalent mechanism.

  The reinforcing member 110B functions to reinforce the columnar portion 40 by connecting the column 10B and the rear rod 2B with tension. As already described, when the net 20 receives the body of the person 100 who is about to fall, shocking tension is applied to the ropes 30 and 31. As a result, a force for pulling down the rope 30 in the direction in which the rope 30 is stretched acts on the columnar portion 40 that supports the rope 31. The load acting on the column 10B when the net 20 deployed between the column 10A and the column 10B receives the body of the person 100 is in a direction to tilt the columnar portion 40 of the column 10B forward of the loading platform 1. Mainly works. At the same time, a load for tilting the columnar portion 40 of the column 10B toward the left side of the loading platform 1 also acts on the column 10B. The reinforcing member 110 </ b> B relieves a large moment applied to the lower end portion of the reinforcing member 40 and the receiving portion 205 of the pedestal portion 50 by adding a reaction against the load to the columnar portion 40, and to the left side of the columnar portion 40. Restrains the tilting. In other words, the reinforcing member 110B functions to increase the strength of the entire column 10B against a load that tends to tilt the columnar portion 40 of the column 10B to the left. Similarly, the reinforcing member 110D functions to increase the strength of the entire support column 10D with respect to a load that tends to tilt the columnar portion 40 of the support column 10D to the right.

(Example of diversion of equipment members)
21 and 22 are schematic explanatory views showing an example in which a part of the fall prevention device 500 is diverted to other uses. In the example of FIG. 21, the columns 10 </ b> A to 10 </ b> D are diverted for the purpose of preventing load collapse of the load 95 on the loading platform 1. In this case, it is desirable to route the ropes 120 and 121 between the column 10A and the column 10C and between the column 10B and the column 10D, respectively. Thereby, the pillars 10A to 10D can support the load 95 with higher strength. The ropes 120 and 121 are preferably attached to the columns 10A to 10D via the carabiner 32 and the tensioner 33 (see FIG. 8) in the same manner as the rope 31, and the rope 31 may be diverted as it is.

  In the example of FIG. 22, the columns 10 </ b> A to 10 </ b> D are used as columns that support the hood 130 that protects the load on the loading platform 1 from rain or the like.

  As described above, the fall prevention device 500 can be used for other purposes specific to the freight vehicle 600 by taking advantage of the characteristic that it can be mounted on the vehicle and keeping a part thereof attached to the loading platform 1 of the freight vehicle 600. It can be diverted. Thereby, even after the loading / unloading operation of the load 90 is completed, it is possible to effectively use the members that are still attached to the loading platform 1 while omitting the trouble of removing all the members of the fall prevention device 500 from the loading platform 1. it can.

(Other embodiments)
(1) FIG. 23 is a perspective view showing another embodiment of the pedestal portion of the column 10. FIG. 24 is a partial cross-sectional view showing a usage state of the pedestal portion. The pedestal portion 150 includes the pedestal portion 50 shown in FIG. 3 and another receiving portion 151 attached to the pedestal portion 50. The receiving part 151 is provided in order to make it possible to stand the columnar part 40 in a state where the collar 2 is opened downward. When the eaves 2 are opened downward, the eaves 2 are attached to the support member 160 protruding downward from the floor plate 3 of the loading platform 1 and come into contact with the eaves contact member 161 made of rubber or the like. There is no. Therefore, the tilting of the columnar section 40 due to the load generated when the net 20 receives the body of the person 100 (see FIG. 16) can be stably regulated by the rod 2.

  The receiving portion 151 is fastened and fixed to the front plate 51 with a bolt, and receives the insertion of the lower end portion of the columnar portion 40, thereby fulfilling the function of supporting the columnar portion 40 in a fixed manner. The receiving portion 151 is preferably bottomed, and when the lower end portion of the columnar portion 40 is inserted, the columnar portion 40 is positioned by the bottom of the receiving portion 151. In this state, the hole 152 formed in the receiving portion 151, the hole 153 formed in the front plate 51, and the pair of holes 41 formed in the lower end portion of the columnar portion 40 overlap each other. As a result, one bolt 154 can be easily inserted into the hole 152 and the hole 153. By tightening the inserted bolt 154 with a nut, the columnar portion 40 can be prevented from coming out of the receiving portion 151. The hole 153 formed in the front plate 51 can also serve as the hole 58 (see FIG. 3).

  The pedestal portion 150 is formed by attaching another receiving portion 151 to the pedestal portion 50 (see FIGS. 3 and 4) that already has the receiving portion 205. Therefore, the pedestal 150 allows the columnar portion 40 to be raised by being attached to the heel 2 regardless of whether the heel 2 is closed upward or in a state where it is opened downward. That is, the pedestal unit 150 can be used properly according to the situation of the work place. Moreover, since the receiving part 151 is attached to the base part 50 so that attachment or detachment is possible with a volt | bolt, it is also possible to attach to the base part 50 and use it only when needed.

  Further, the attaching operation of the pedestal 150 to the heel 2 can be performed in a state where the heel 2 is closed upward, and then the heel 2 is opened downward to attach the columnar portion 40. Similarly, the removal work of the pedestal part 150 from the ridge 2 can be performed by removing the columnar part 40 from the pedestal part 150 and then closing the ridge 2 upward. In this way, the pedestal portion 150 can be easily attached to and detached from the heel 2.

  25 and 26 are schematic explanatory diagrams of the work of unloading the load 90. When the heavy load 90 on the loading platform 1 is lowered using a crane, the wire rope 302 for hanging on the hook 91 of the crane is passed through the side and the lower side of the load 90 to be lifted (hanging) One of the tasks). As shown in the right side fence 2R illustrated in FIG. 25, when the fence 2 is in a state of being closed upward, a narrow gap between the fence 2 and the load 90, and the flooring 301, depending on how the load 90 is stacked. In some cases, it may be difficult to pass the wire rope 302 through the gap between the floor board 1 and the load 90 made by the above-described method.

  In such a case, as in the port 2L illustrated in FIGS. 25 and 26, when the rod 2 is open downward, the operation of passing the wire rope 302 can be performed efficiently. If the pedestal 150 is used, the net 20 can be deployed above the outer periphery of the loading platform 1 with the basket 2 opened downward, so that the safety of the personnel 100 (see FIGS. 15 and 16) who perform the work can be improved. While aiming, the slinging operation can be performed efficiently. Since the net 20 is flexible, it does not prevent the personnel 100 from performing such a slinging operation inside the net 20. Even when the pedestal portion is attached to the rear lid 2B, if the pedestal portion 150 is used, it is possible to efficiently perform the slinging operation at the rear portion of the loading platform 1 while ensuring safety.

  (2) FIG.27 and FIG.28 is a figure for demonstrating the fall prevention apparatus assembled by standing upright on a loading platform, without using the base parts 50 and 150. FIG. FIG. 27A is a schematic plan view of a freight vehicle 601 as a trailer vehicle, and FIG. 27B is a cross-sectional view of the cargo bed 160 taken along the line PP in FIG. 27A. In a commercially available trailer vehicle, a mounting hole 161 for inserting a column 162 for preventing load collapse is generally formed in the floor plate of the loading platform 160. The attachment hole 161 is disposed along the outer periphery of the loading platform 160.

  As shown in FIG. 28, by appropriately setting the width of the columnar portion 40, the columnar portion 40 can be detachably fixed to the loading platform 160 using the attachment holes 161. As shown in FIG. 28, it is possible to insert the lower end portion of the columnar portion 40 into the mounting hole 161 at a predetermined depth by providing a locking projection 164 on the side surface near the lower end portion of the columnar portion 40. It becomes. The protrusion 164 has a hole, and functions as an annular member for attaching the rope 30 (see FIG. 1) similarly to the annular member 11. The protruding portion 164 is attached to the columnar portion 40 by welding, for example, similarly to the protruding portion 12.

  The column 310 configured as described above is used as a column for unfolding the net 20 by spanning the ropes 30, 31, and 37 without using the pedestals 50 and 150, similarly to the column 10 (FIG. 2) of the fall prevention device 500. be able to. On the other hand, the column 310 can be used as a columnar portion attached to the pedestal portions 50 and 150 in the same manner as the columnar portion 40 shown in FIGS. Furthermore, it is also possible to divert only the column 310 as a column for preventing the collapse of the load like the commercially available column 162 without installing the ropes 30, 31, 37 and the net 20.

  If the columnar portion 40 only needs to be diverted to a column for preventing collapse of the load and it is not necessary to use it as a column for deploying the net 20 on the loading platform 160, a columnar shape as illustrated in FIG. It is only necessary to provide the protrusion 163 having a simpler structure at the lower end of the portion 40. The protruding portion 163 is formed by attaching a sheet metal piece having a required thickness to the columnar portion 40 by welding, for example. Both the protrusions 163 and 164 attached to the lower end of the columnar part 40 are also used as locking members that determine the insertion position of the columnar part 40 when the receiving parts of the base parts 50 and 150 are bottomless. You can also.

  (3) FIG. 30 is a front view showing an example in which the support column 10 is extendable. The column 170 has a fixed columnar portion 171 and a movable columnar portion 172 as the columnar portion 173. The fixed columnar portion 171 is detachably fixed to the pedestal portion 50 at its lower end, similarly to the columnar portion 40 (see FIG. 2). The fixed columnar portion 171 is formed in a cylindrical shape or a tubular shape, and thereby accommodates the movable columnar portion 172 so as to be slidable. A rack gear 174 is engraved on one side surface of the movable columnar portion 172. Near the upper end portion of the fixed columnar portion 171, a gear box 175 that houses a combination gear for expanding and contracting the movable columnar portion 172 by transmitting the rotation of the handle 176 to the rack gear 174 is provided. A stopper 177 is provided near the upper end of the fixed columnar portion 171 to restrict the free fall of the movable columnar portion 172 by engaging with a gear in the gear box 175.

  If the extendable strut 170 is used, the height of the net 20 deployed on the loading platform 1 can be easily changed. In addition, the height of the net 20 can be changed continuously instead of stepwise. Furthermore, after attaching the rope 31 to the support column 170 at a low position where it is easy to work, it is possible to raise the support column 170 and expand the net 20 high. That is, the rope 31 can be easily attached to and detached from the support post 170.

  (4) FIG. 31 is a perspective view illustrating a pedestal portion that is detachably fixed to the collar 2 with screws. The pedestal portion 180 is formed in the same manner as the receiving portion 151 illustrated in FIG. The hole 181 corresponds to the hole 151. Therefore, the columnar portion 40 can be fixed by inserting the lower end portion of the columnar portion 40 into the pedestal portion 180 and fastening with the bolt.

  The pedestal portion 180 can be formed to be simpler and lighter than the pedestal portion 50. In FIG. 31, the pedestal portion 180 is bottomed, but the pedestal portion 180 may be formed without a bottom, and the lower end of the columnar portion 40 may be supported by the floor plate 3. Alternatively, the pedestal portion 180 may be formed without a bottom, and the column 310 of FIG. 28 or the columnar portion 40 of FIG. 29 may be inserted and used. Furthermore, in FIG. 31, although the base part 180 is attached to the inner main surface of the collar 2, it can also be used by attaching to the outer main surface. When the columnar part 40 of FIG. 2 or FIG. 29 is used as the columnar part inserted into the pedestal part 180, a tubular member (not shown) for attaching the rope 30 may be attached to the side wall surface of the pedestal part 180. . The tubular member can be formed in the same manner as the tubular member 11 (see FIGS. 2 and 3) or the protrusion 12 (see FIG. 2).

  (5) The fall prevention device according to the above embodiment deploys the net 20 between the plurality of support columns 10 via the ropes 30 and 31. On the other hand, it is also possible to expand the mesh 20 between the columns 10 by tying the mesh 20 to the tubular members 11, 13 and the like of the support column 10 without using the ropes 30 and 31.

  (6) Although the fall prevention device according to each of the above embodiments is attached to the loading platform of a large truck including a trailer, it can be applied to general cargo vehicles including a railway vehicle.

1 is a schematic side view of a cargo vehicle including a fall prevention device according to an embodiment of the present invention. It is a front view which shows the whole structure of the support | pillar of FIG. It is a perspective view which shows the structure of the base part of FIG. It is a fragmentary sectional view of the base part of FIG. It is explanatory drawing which shows the attachment state to the collar of the base part of FIG. It is a fragmentary sectional view of the base part of FIG. It is the external appearance schematic which shows the mechanism in which a support | pillar supports a rope. It is an expansion external view of the carabiner and tension device of FIG. It is an expansion external view which shows the mechanism in which a rope supports a net | network. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is a schematic explanatory drawing which shows the function and advantage of the fall prevention apparatus of FIG. It is a schematic explanatory drawing which shows the function and advantage of the fall prevention apparatus of FIG. It is a side view which shows another usage pattern of the fall prevention apparatus of FIG. It is process drawing which shows the process of changing the height of the net | network of the fall prevention apparatus of FIG. It is explanatory drawing which shows the advantage which adjusts the height of the net | network of the fall prevention apparatus of FIG. It is a perspective view which shows the example which attached another reinforcement member to the fall prevention apparatus of FIG. It is a schematic explanatory drawing which shows the diversion example of the member of the fall prevention apparatus of FIG. It is a schematic explanatory drawing which shows another example of diversion of the member of the fall prevention apparatus of FIG. It is a perspective view which shows the base part by embodiment different from FIG. It is a fragmentary sectional view which shows the use condition of the base part of FIG. It is explanatory drawing which shows the advantage of the base part of FIG. It is explanatory drawing which shows the advantage of the base part of FIG. It is a schematic explanatory drawing of a commercial trailer vehicle. It is a figure which shows the support | pillar of the fall prevention apparatus by embodiment different from FIG. It is a figure which shows the columnar part by embodiment different from FIG. It is a figure which shows the support | pillar by embodiment different from FIG. It is a perspective view which shows the base part by embodiment different from FIG.3 and FIG.24.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,160 Loading platform 2L 2L Left side 2R Right side 2B Rear end 3 Floor board 10,10A-10D, 170,310 Post 11,11 Annular member 12 Protrusion part (tubular member) 20 Net 22, 32 Carabiner 30, 31, 37 , 81, 82 Rope 33 Tensioner 40, 173 Column 50, 150, 180 Base 53, 54 Leg plate (guide member) 59 Contact plate (contact member)
60 Screw support portion 61 Press member 63 Screw 65 Press plate (press member) 66 Engagement member 67 Elastic member 100 Person 110B, 110D, 360 Reinforcement member 112, 361 Turnbuckle 151, 205 Receiving portion 161 Hole 163, 164 Protrusion portion 163 , 164 Protrusion 500 Fall prevention device 600, 601 Cargo vehicle

  The present invention relates to a fall prevention device for preventing a person from falling from a loading platform of a cargo vehicle, a cargo vehicle provided with the device, a cargo vehicle enabling the installation of the device, and a method for assembling the fall prevention device. About.

  At a construction site, a material used for construction is carried into the site by a large truck (4 ton car, 10 ton car, trailer car, etc.). Incoming materials include materials used in relatively early stages of construction processes, such as H-shaped steel, reinforcing steel, formwork, and cement, as well as electrical materials, ducts, piping materials, plaster boards, wall cloths, tiles, blocks, It covers a wide range of materials, such as paints, finishing hardware, joinery, lighting, etc., which are required for the medium and late periods, and thus furniture after construction. In other words, large-scale trucks are carried in at the work site over the entire construction period, and sometimes carried out.

  In recent years, with the improvement of the safety level at the field work site, attention has been focused on the necessity of preventing accidents of falling of workers from the truck bed when materials are loaded and unloaded. This kind of fall accident has been greatly reduced as a result of heart and heart poured into the fall of workers from scaffolds and steel frames during construction. Therefore, as we went further and pursued the weaknesses and blind spots of the fall accident, attention has been focused on preventing the fall accident of workers from the truck bed.

  According to Articles 518 to 521 of the Occupational Safety and Health Regulations, when working at a place with a height of 2 meters or more, it is necessary to take measures to prevent the workers from falling, such as using a safety belt. Has been. The truck bed is no more than 2 meters above the ground. However, workers often work while standing on a load higher than the truck bed. In this case, even if the worker is at a height of 2 meters or less based on the loading platform or the load, the worker works at a height exceeding 2 meters when the ground is used as a reference. If it falls on the ground, the worker will be appropriately damaged and sometimes life threatened.

  Furthermore, in construction sites such as buildings, the ground is excavated deeply in the early stages of construction work to form the foundation and underground parts, and trucks carrying materials in and out are bridged over the excavated cavities. It is customary to stop on the pier and unload materials. In this case, once the worker falls from the truck bed, the worker may fall to the bottom of a few tens of meters.

  Therefore, conventionally, a master strut (a strut for stroking a safety strap to hang a safety belt) is attached to the highest part of the load on the loading platform, and as the work for lowering the load proceeds, Work was being done to reattach the leash struts one after another. However, this method has a problem that it is not efficient and is not suitable for the actual situation at the work site. In addition, an operator wearing a safety belt can avoid a crash to the ground, etc., when falling from the load, but it receives a concentrated load on the body part wearing the safety belt, and the body receives an impact. There was a problem that it could be a source of aftereffects.

  On the other hand, as a technique for preventing an operator from falling from a truck bed without using a safety belt, for example, Patent Document 1 discloses a detachable fence-like structure that is used by being attached to a luggage rack. Things are disclosed. However, this prior art provides a fence that can be gripped by a cage when an operator working on the loading platform loses the balance of the body, and does not reliably prevent falling from the loading platform. It was. In order to increase the effect of preventing falling, it is necessary to densely arrange the fence-like structure along the outer periphery of the loading platform. Moreover, in order to prevent the fall of the operator who works on the material loaded on the loading platform of a large truck, it is necessary to make a fence-like structure tall. As a result, the total weight of the fence-like structure increases, which is inconvenient to handle.

In addition, with the displacement of the load suspended by a crane or the like, the operator is likely to hit the body against the rigid fence-like structure by being pushed by the load. Furthermore, the operator may be sandwiched between the misaligned load and the fence-like structure, and may be pressed by the heavy load. In addition, since the worker must work in a narrow space surrounded by a fence-like structure as a wall that does not move, the problem is that the freedom of the body is restrained and the workability on the loading platform is bad There was a point.
JP 2004-058949 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a fall prevention technique that is light and easy to handle, and that can improve workability and safety on the loading platform.

In order to solve the above-mentioned problems and achieve the above-mentioned object, the invention according to claim 1 is a fall prevention device for preventing a person from falling from a cargo bed of a cargo vehicle, and is attached to and detached from an outer peripheral portion of the cargo bed. A plurality of struts standing upright, between each of the plurality of struts and any one of the plurality of struts adjacent to each strut along the outer periphery, and And a net deployed between different heights along each column , wherein the plurality of columns are attached to the heel of the cargo bed, and each of the plurality of columns is detachable from the bag. It has an attached pedestal part, and a columnar part that stands on the pedestal part by detachably attaching a lower end to the pedestal part .

  According to this structure, the net | network is developed between the group of the support | pillar standing adjacently along the outer peripheral part of a loading platform, and between different heights along each support | pillar, and, thereby, a loading platform. A net is developed above the outer periphery of the. For this reason, even if personnel who work on the cargo bed or on the load on the cargo bed lose their footing due to unforeseen circumstances, they can be prevented from falling from the cargo bed by the deployed net. it can. In addition, unlike the case of using a fence with rigidity, the impact of the body being received is small due to the flexibility of the net. Furthermore, even when personnel are pushed against the load, the net flexibly receives the body, reducing the risk of being subjected to pressure. That is, safety is improved.

  In addition, due to the flexibility of the net, personnel can perform work and the like while pushing the net to some extent with a part of the body such as an arm on the bed and on the load on the bed. That is, the freedom of body freedom by the net is loose, and the substantial work space is expanded. As a result, workability on a narrow limited bed is improved. Furthermore, since the restraint of freedom of the body is gentle, the mental pressure of the person who performs work on a narrow carrier is reduced. This also contributes to the improvement of workability.

  Moreover, since the fall prevention apparatus by this structure uses the lightweight member called a net | network as a member which receives the body of a person, it is lightweight also as the whole apparatus. Moreover, since the column can be attached and detached, the fall prevention device can be removed while the cargo vehicle is traveling. Due to its light weight, the fall prevention device can be disassembled and loaded on a cargo vehicle when not in use.

  In addition, since the net can be arbitrarily deployed between struts having a smaller interval than its own length, the same fall prevention device can be installed in various cargo vehicles having different cargo bed sizes. . Therefore, it is necessary to prepare a set of members for the fall prevention device before assembly, that is, an assembly kit for the fall prevention device, at the work site where various types of vehicles enter and load and unload the load. Is also possible.

  Note that “between each of the plurality of struts and any one of the plurality of struts adjacent to each of the struts along the outer peripheral portion” is adjacent to the outer peripheral portion. It is not necessarily required to be between all pairs. For example, when the plurality of support columns are four support columns erected at portions corresponding to the four corners of the loading platform, a net is developed between the left and right front and rear sets, and the right and left front and rear The net is only developed between the sets, and the net does not have to be developed between the front left and right set and between the rear left and right set. That is, it is sufficient that a net is developed between each of the plurality of support columns and any of the support columns adjacent along the outer peripheral portion.

Moreover, according to this structure, since the some support | pillar is attached to the ridge of the loading platform, the floor area of the loading platform which can load a load can be ensured widely.

  Furthermore, according to this structure, each support | pillar can be erected by attaching a pedestal part to a cage | basket, and attaching a columnar part to a pedestal part, and standing up after that. That is, since each column can be erected step by step, the column erection operation is facilitated.

  The invention according to claim 2 is the fall prevention device according to claim 1, wherein any one of the plurality of columns and the plurality of columns adjacent to the columns along the outer peripheral portion. Further, a linear body spanned at two or more different heights is provided between the struts, and the net is developed between the linear bodies having different heights.

  According to this structure, the net | network is expand | deployed above the outer peripheral part of the cargo bed by the linear body spanned between the group of the support | pillar standing adjacent to the outer peripheral part of the cargo bed. For this reason, the operation | work which expand | deploys a net | network between support | pillars can be performed easily. Further, it is possible to easily apply tension to the net as necessary. Also, since the linear body can be arbitrarily routed between struts that are narrower than its own length, the same fall prevention device must be installed in various cargo vehicles with different cargo bed sizes. Not disturb.

  In this configuration, the “net deployed between the linear bodies” does not necessarily require that the net is stretched in a tensioned state. For example, it may be gently developed between the linear bodies in a state where the net hangs down. Further, in the present invention, the linear body is preferably a rope from the viewpoint of strength, suppleness, easy-to-handle thickness, etc., but includes not only ropes or ropes, but also wires and belts, and has the same strength as ropes. It has a certain degree of flexibility and is a general term for linear objects that can be used in the present invention.

  The invention according to claim 3 is the fall prevention device according to claim 2, wherein each of the plurality of support columns has an annular member for attaching the linear body to two or more portions having different heights. Is.

  According to this structure, since each support | pillar has the annular member for attaching a linear body to two or more site | parts from which height differs, a linear body is attached to a support | pillar by attaching a linear body to an annular member. Can be easily attached to.

  The invention according to claim 4 is the fall prevention device according to claim 3, wherein the two or more parts are three or more parts having different heights.

  According to this configuration, since each support column has an annular member for attaching the linear body to three or more parts having different heights, the linear member can be selected by selecting the annular member to which the linear body is attached. You can easily change the height of your body.

  The invention according to claim 5 is the fall prevention device according to claim 3 or 4, wherein each of the linear bodies is supported by the annular member in a detachable manner via a carabiner.

  According to this structure, since each linear body is detachably supported by the annular member via the carabiner, the attaching operation and the detaching operation of each linear body to the corresponding column are facilitated.

  A sixth aspect of the present invention is the fall prevention device according to any one of the second to fifth aspects, wherein one end of each of the linear bodies is supported by a corresponding column via a tensioner. It is.

  According to this structure, since the end of each linear body is supported by the corresponding support | pillar via the tensioner, the operation | work which tensions and loosens a linear body is facilitated.

  The invention according to claim 7 is the fall prevention device according to any one of claims 2 to 6, wherein the net is detachably attached to the linear bodies having different heights via a carabiner. Is.

  According to this configuration, since the net is detachably attached to the linear body via the carabiner, the work for attaching and detaching the net to the linear body is facilitated.

  The invention according to claim 8 is the fall prevention device according to any one of claims 2 to 7, wherein the plurality of support columns are erected at portions corresponding to at least four corners of the cargo bed, Is deployed at least on the left and right sides of the loading platform, and among the four struts standing at the portions corresponding to the four corners of the loading platform, those standing at the left front portion and standing at the right front portion. A linear body is also stretched between the one provided and the one erected on the left rear part and the one erected on the right rear part.

  According to this structure, the linear body is spanned between the pillars that are erected at the portions corresponding to the four corners of the cargo bed and the pillars that are adjacent in both directions along the outer periphery. For this reason, when the net receives the personnel's body, the load is distributed to all four columns. That is, since the four struts cooperate to support the load acting on a part of the net, concentration of the load on one strut is reduced. For this reason, safety is further improved.

  A ninth aspect of the present invention is the fall prevention device according to any one of the first to seventh aspects, wherein the plurality of support columns are erected at portions corresponding to at least four corners of the loading platform. .

  According to this configuration, since the plurality of support columns are erected at portions corresponding to the four corners of the loading platform, the net is widened on at least two of the outer circumference of the loading platform, that is, the left side, the right side, the rear side, and the front side. It becomes possible to expand. In the present invention, the “four corners of the loading platform” need only be substantially four corners of the loading platform, and does not need to be the four corners of the loading platform accurately and geometrically.

  A tenth aspect of the present invention is the fall prevention device according to the ninth aspect, wherein the net is developed at least on the left and right sides of the loading platform.

  According to this configuration, since the net is deployed on the left and right sides of the loading platform with the highest risk of falling, a high fall prevention effect can be obtained.

  The invention according to claim 11 is the fall prevention device according to claim 10, wherein the net is also developed behind the cargo bed.

  According to this configuration, since the net is also deployed behind the loading platform, the fall prevention effect is further enhanced.

  A twelfth aspect of the present invention is the fall prevention device according to the tenth or eleventh aspect, wherein the net is also deployed in front of the loading platform.

  According to this configuration, since the net is also deployed in front of the loading platform, the fall prevention effect is further enhanced. When the freight vehicle is a truck, a torii is provided in front of the loading platform, and this torii is expected to contribute to a certain extent to prevent falling. However, since the torii is as rigid as the fence in the prior art, safety can be improved by providing a net in front. Furthermore, when personnel work on the platform at a height exceeding the torii, safety is particularly enhanced by deploying a net in front of the platform.

  A thirteenth aspect of the present invention is the fall prevention device according to any one of the first to twelfth aspects, wherein each of the plurality of support columns is extendable.

  According to this structure, since each support | pillar can be expanded-contracted, the height of a net | network can be adjusted by adjusting the expansion / contraction degree of each support | pillar.

A fourteenth aspect of the present invention is the fall prevention device according to any one of the first to thirteenth aspects , wherein the pedestal portion straddles the edge of the heel, and one main surface and the other main surface of the heel. And a clamp structure that is fixed to the flange by clamping.

  According to this configuration, since the pedestal portion has a clamp structure that is fixed to the heel by clamping and sandwiching both main surfaces of the heel over the heel, the pedestal portion can be processed without being processed into the heel. Can be installed on the fence.

According to a fifteenth aspect of the present invention, in the fall prevention device according to the fourteenth aspect , the clamp structure includes a contact member that contacts the edge, and a screw that advances and retreats toward the one main surface as it rotates. A member that is connected to the contact member and is screwed to the screw to support the screw; a pressing member that is connected to the contact member and contacts the other main surface; and the screw A pressing member that is attached to the end of the screw and abuts against the one main surface by advancing the screw and presses the one main surface, thereby tightening the one main surface and the other main surface in cooperation with the pressing member And.

  According to this configuration, the clamp structure is positioned at the edge by the contact member. Further, by rotating the screw, the screw can be advanced to press the pressing member against one main surface of the heel. Thereby, since a press member and a pressing member will clamp both main surfaces of a scissors, a clamp structure is fixed to a scissors. Thus, according to this structure, a base part can be easily attached to a collar by rotating a screw.

The invention according to claim 16 is the fall prevention device according to claim 15 , wherein the pressing member is restrained freely in the rotational direction of the screw and allowing play in the axial direction of the screw, An engaging member that engages with the screw, and an elastic member that is attached to a side of the engaging member that faces the one main surface.

  According to this configuration, when the screw is rotated, the pressing force is transmitted to the elastic member through the engaging member engaged with the screw, and the elastic member presses one main surface of the heel. For this reason, it is possible to tighten the scissors without damaging the main surface of the scissors. Further, since the engaging member engages with the screw freely in the rotation direction of the screw, the screw can be smoothly rotated. Further, since the rotation of the elastic member accompanying the rotation of the screw is suppressed, the elastic member is hardly worn and the main surface of the ridge is not easily damaged. Further, since the engaging member is restrained while allowing play in the axial direction of the screw, when the screw is rotated in the loosening direction, even after releasing the pressing state of the heel by the pressing member, the screw is retracted. The pressing member does not leave the screw. For this reason, the workability | operativity at the time of attaching or removing a base part is improved. Note that “while allowing play” means that there may or may not be play.

The invention according to claim 17 is the fall prevention device according to claim 16 , wherein the tip of the screw protrudes at the center, and the top of the protrusion abuts against a part of the engagement member and presses. By doing so, a pressing force is applied to the engaging member.

  According to this configuration, since the tip of the screw protrudes at the center portion, and the top portion of the protruding portion comes into contact with and presses a part of the engaging member, a pressing force is applied to the engaging member. The screw can be rotated more smoothly. Moreover, the rotation of the elastic member accompanying the rotation of the screw can be further suppressed.

The invention according to claim 18 is the fall prevention device according to claim 16 or 17 , wherein the clamp structure restrains the rotation of the engagement member around the axis of the screw, and It further has a guide member that guides it slidably in the axial direction of the screw.

  According to this configuration, since the rotation of the engaging member is restrained by the guide member, the rotation of the elastic member accompanying the rotation of the screw can be reliably restrained.

The invention according to claim 19 is the fall prevention device according to any one of claims 15 to 18 , wherein the clamp structure includes the contact member, the screw, the screw support portion, the pressing member, and the pressing member. A set with a member is provided at a plurality of sites along the edge of the ridge.

  According to this structure, since the several site | part along the edge of a collar is clamp | tightened with a pressing member and a pressing member, a base part is stably fixed to a collar.

The invention according to claim 20 is the fall prevention device according to any one of claims 14 to 19 , wherein the clamp structure is a square-shaped member having a cross-sectional dimension of 50 mm × 50 mm along the edge thereof. In a state where the bulge is held, the ridge can be sandwiched.

  According to this configuration, since the clamp structure has a shape that can hold the ridge in a state of holding a square-shaped bulge having a cross-sectional dimension of 50 mm × 50 mm along the edge of the ridge, the clamp structure is a commercially available track. It becomes possible to deal with almost all the traps.

The invention according to claim 21 is the fall prevention device according to any one of claims 14 to 20 , wherein the pedestal portion is a member connected to the clamp structure or a member constituting a part of the clamp structure. And a cylindrical receiving portion that supports the columnar portion by receiving the insertion of the lower end portion of the columnar portion.

  According to this configuration, the columnar portion can be erected by inserting the lower end portion of the columnar portion into the cylindrical receiving portion as a member constituting the clamp structure or a member constituting a part of the clamp structure. The columnar part is stably supported, and the work of raising the columnar part is facilitated.

A twenty-second aspect of the present invention is the fall prevention device according to the twenty- first aspect, wherein the receiving portion has a bottom.

  According to this structure, since the receiving part which should insert the lower end part of a columnar part is bottomed, when raising a columnar part, the depth which should insert a columnar part is decided with a bottom. For this reason, the columnar portion can be raised to a predetermined height by a simple operation.

Invention of Claim 23 is the fall prevention device of Claim 21 or 22 , Comprising: It is a member which connects between the said base part and the said columnar part attached to the said base part so that attachment or detachment is possible, A reinforcing member that restrains tilting of the columnar portion around the receiving portion with tension is further provided.

  According to this configuration, since the reinforcing member is provided, the strength against the load that is generated when the net receives the body of the person and that tries to tilt the columnar portion around the receiving portion is increased. Since the reinforcing member is detachable, it does not hinder the incorporation and removal of the columnar part from the pedestal part.

According to a twenty-fourth aspect of the present invention, in the fall prevention device according to the twenty-first or twenty-second aspect , the rod and the columnar portion attached to at least one pedestal portion of the plurality of support columns are detachably connected. And a reinforcing member that restrains the tilt of the columnar portion around the receiving portion with tension.

  According to this configuration, since the reinforcing member is provided, the strength against the load that is generated when the net receives the body of the person and that tries to tilt the columnar portion around the receiving portion is increased. Since the reinforcing member is detachable, it does not hinder the incorporation and removal of the columnar part from the pedestal part.

The invention according to claim 25 is the fall prevention device according to claim 24 , wherein the pedestal portion of the at least one support column is attached to a side rod, and one end of the reinforcing member is attached to the rear rod. Is.

  According to this configuration, since the columnar portion supported by the pedestal portion attached to the side rod is reinforced by the reinforcing member attached at one end to the rear rod, it occurs when the net receives the body of the person. It is a load, and the intensity | strength with respect to the load which tries to incline a columnar part sideward around a receiving part is raised.

The invention of claim 26, wherein is a fall prevention device according to any one of claims 23 to 25, wherein the reinforcing member, and has a turnbuckle for generating the tension.

  According to this configuration, since the reinforcing member has the turnbuckle, the tension by the reinforcing member can be easily adjusted.

A twenty-seventh aspect of the present invention is the fall prevention device according to any one of the twenty-first to twenty-sixth aspects, wherein the columnar portions of the plurality of struts have a protrusion on the side surface in the vicinity of the lower end thereof. .

According to this configuration, since each columnar part has a protrusion on the side surface near the lower end, it is inserted into a mounting hole for a load collapse prevention column provided on the loading platform of the trailer vehicle, and the protrusion is used as an edge of the hole. By abutting, the columnar part can be erected on the loading platform at a predetermined height. Thereby, it becomes possible to divert the columnar part as a column for preventing collapse of the cargo bed of the trailer vehicle .

Invention 請 Motomeko 28 described is a fall prevention device according to any one of claims 14 to 27, wherein the base unit is to make the columnar portion when in a state in which the Ao is closed upwards Is possible.

  According to this configuration, since the pedestal portion allows the columnar portion to stand when the heel is closed upward, the column can be erected on the heel closed upward.

A twenty- ninth aspect of the present invention is the fall prevention device according to any one of the fourteenth to twenty-seventh aspects, wherein the pedestal portion raises the columnar portion when the heel is in a state of hanging downward. Is possible.

  According to this configuration, since the pedestal portion allows the columnar portion to stand when the heel is in a state of hanging downward, it is possible to stand the column on the heel hanging downward. it can. The heel does not open much more than it hangs down. For this reason, the tilting of the columnar part due to the load generated when the net receives the body of the person can be stably regulated by the scissors.

The invention of claim 30 wherein is a freight vehicle, those having a fall prevention device according to any one of claims 1 to 29.

According to this configuration, since the cargo vehicle includes the fall prevention device of the present invention, workability and safety on the loading platform can be improved. Moreover, since the fall prevention device is lightweight and easy to handle, it can be easily attached to and detached from the vehicle .

Invention 請 Motomeko 31 wherein is a method of assembling a fall prevention device according to any one of claims 2 to 8, strut upright erected detachably said plurality of struts to the outer peripheral portion of the loading platform A step and a linear body that supports at least both ends of the net are spanned at two or more different heights between each of the plurality of columns and the column adjacent to each column along the outer periphery. By this, the network expansion | deployment process which expand | deploys the said net | network above the outer peripheral part of the said loading platform is provided.

  According to this structure, a support | pillar can be erected on the outer peripheral part of a cargo bed by a support | pillar standing-up process, and a net | network can be expand | deployed above the outer peripheral part of a cargo bed by a net | network expansion | deployment process. That is, the fall prevention device of the present invention can be attached to the cargo bed of the cargo vehicle. Moreover, the net can be easily developed by spanning the linear bodies that support both ends of the net between the corresponding columns.

As described above, according to the assembling method of the fall prevention device, cargo vehicle, and fall prevention device of the present invention, workability and safety on the loading platform can be improved, and handling properties can also be improved. .

(Overall configuration of the device)
FIG. 1 is a schematic side view of a freight vehicle including a fall prevention device according to an embodiment of the present invention. The cargo vehicle 600 is embodied as a large truck. A fall prevention device 500 is detachably installed on the loading platform 1 of the cargo vehicle 600. The fall prevention device 500 includes a plurality of struts 10, a net 20, and ropes 30 and 31 as main members. The column 10 includes a columnar part 40 and a pedestal part 50. The pedestal portion 50 is detachably attached to the edge of the bag 2 of the loading platform 1 by a clamp mechanism. The columnar part 40 is stood by attaching a lower end part to the base part 50 so that attachment or detachment is possible. Thereby, the column 10 is erected on the outer peripheral portion of the loading platform 1.

  At least two struts 10 are erected. In the following description, an example in which four struts 10 are erected at the four corners of the loading platform 1 will be taken up. In FIG. 1, only a support column 10 (represented by reference numeral 10 </ b> A as necessary) provided on the left front side of the loading platform 1 and a support column 10 (represented by reference numeral 10 </ b> B as necessary) provided on the left rear side are illustrated. . Since the fall prevention device 500 is configured similarly to the left side on the right side of the loading platform 1, only the configuration on the left side will be described as a representative.

  A rope 30 and a rope 31 are stretched between the support 10A and the support 10B. The rope 30 is supported near the lower ends of the columns 10A and 10B, and the rope 31 is supported on the upper ends of the columns 10A and 10B. More specifically, the rope 30 is supported by the pedestal portion 50 along the edge of the rod 2, and the rope 31 is supported by the top of the columnar portion 40. As will be described later, both ends of the ropes 30 and 31 are detachably supported by the columns 10A and 10B via carabiners. Furthermore, one end of the ropes 30 and 31 is supported by the support 10A through a tensioner together with a carabiner. Thereby, both the ropes 30 and 31 are stretched between the support column 10A and the support column 10B in a tension state.

  The net | network 20 is expand | deployed between the support | pillar 10A and the support | pillar 10B by expand | deploying between the rope 30 and the rope 31. FIG. More specifically, the upper end of the net 20 is supported by the rope 31 and the lower end is supported by the rope 30. The rope 31 is provided in order to suspend the net 20, and the rope 30 is provided in order to avoid a gap that allows a person to slip through the net 20 and the rod 2. As will be described later, the net 20 is detachably attached to the ropes 30 and 31 via a carabiner. FIG. 1 shows an example in which the net 20 is deployed between the rope 30 and the rope 31 in a state where the net 20 hangs gently, but may be deployed in a tensioned state as will be described later. For example, the lateral end of the mesh 20 is a string (string) so that the mesh 20 is free to move horizontally along the ropes 30 and 31 so that a large gap is not formed between the mesh 20 and the supports 10A and 10B. ) It is desirable to be connected to the pillars 10A and 10B with 25 or the like.

  Since the cargo vehicle 600 includes the fall prevention device 500 configured as described above on the loading platform 1, a person working on the loading platform 1 falls outside the loading platform 1 as described in detail later. Can be prevented.

(Configuration of each part of the device)
Next, details of each part of the fall prevention device 500 will be described with reference to FIGS. FIG. 2 is a front view showing the overall configuration of the column 10. As described above, the column 10 includes the columnar portion 40 and the pedestal portion 50. In the following example, the main part of the support column 10 is made of steel, but a light metal, for example, an aluminum alloy may be used as a material in order to further reduce the weight.

  The columnar portion 40 is supported and fixed to the pedestal portion 50 by inserting a lower end into a receiving portion (not shown) of the pedestal portion 50. In the following example, the columnar section 40 is embodied as a hollow prism. An annular member 13 is attached to the top of the columnar portion 40 by welding, for example. Further, a pair of fin-shaped protrusions 12 are attached to the vicinity of the center of the columnar part 40 by, for example, welding. The pair of annular members 11 are attached to the pedestal portion 50 by welding, for example. The annular members 11 and 13 are provided as members for attaching the ropes 30 and 31, respectively. Moreover, the hole is formed in the projection part 12, and the projection part 12 contains an annular member by it. A rope for suspending the net 20 can also be attached to the annular member defined by the protrusion 12. As an object to which a rope for suspending the net 20 is attached, two types of an annular member 11 and a protruding portion 12 can be selected, and thereby the height of the net 20 can be changed.

  A pair of reinforcing members 360 are preferably detachably connected between the pair of protrusions 12 and the base 50. In addition to the hole for attaching the rope, the protrusion 12 is formed with a hole for attaching one end of the reinforcing member 360. In addition, a pair of protrusions 56 in which holes are formed are attached to the pedestal 50 by, for example, welding. Both ends of the reinforcing member 360 are attached to the protrusions 12 and 56 by bolts that are inserted into these holes and tightened with nuts. The pair of reinforcing members 360 are provided on both sides of the columnar portion 40 so as to be symmetrical. A turnbuckle 361 is interposed in the reinforcing member 360, and tension can be applied to the reinforcing member 360 by rotating the turnbuckle.

  The reinforcing member 360 functions to reinforce the columnar portion 40 by connecting the columnar portion 40 and the pedestal portion 50 with tension. When the net 20 receives the body of a person who is about to fall, shocking tension is applied to the ropes 30 and 31. As a result, a force for pulling down the rope 30 in the direction in which the rope 30 is stretched acts on the columnar portion 40 that supports the rope 31. That is, a load for tilting the columnar portion 40 around the receiving portion of the pedestal portion 50 that supports the lower end portion of the columnar portion 40 is generated. The reinforcing member 360 relieves a large moment applied to the lower end portion of the reinforcing member 40 and the receiving portion of the pedestal portion 50 by adding a reaction to the load to the columnar portion 40 and restrains the tilting of the columnar portion 40. . That is, the reinforcing member 360 serves to increase the strength of the entire support column 10 against a load that tends to tilt the columnar section 40.

  FIG. 3 is a perspective view showing the configuration of the pedestal portion 50. The pedestal portion 50 includes a trunk portion 200 that is a portion that rests on the edge of the collar 2, and four leg portions 201 to 204 that project downward from the trunk portion 200 so as to sandwich the collar 2. The trunk | drum 200 and the leg parts 201-204 are integrally connected by welding. The pair of leg parts 201 and 202 facing each other and the pair of leg parts 203 and 204 facing each other are positioned at two positions along the edge of the heel 2 so that the left and right end parts of the trunk part 200 It is linked to.

  The body portion 200 includes a front plate 51, a back plate 52, a pair of connection plates 55, a pair of connection plates 57, and a contact plate 59. The front plate 51 and the back plate 52 that are paired in the front-rear direction are connected by a pair of connecting plates 55, a pair of connecting plates 57, and a contact plate 59. These are connected together by welding. The contact plate 59 corresponds to a specific example of the contact member of the present invention, and plays a role of positioning the pedestal 50 on the edge of the flange 2 by contacting the edge of the flange 2. The pair of connecting plates 55 functions as a base for fixing the protruding portion 56 and the annular member 11. The pair of connecting plates 57 constitutes a cylindrical receiving portion 205 in cooperation with the front plate 51 and the back plate 52, and receives the insertion of the lower end portion of the columnar portion 40, thereby supporting the columnar portion 40 in a fixed manner. Fulfills the function of Of the front plate 51 and the back plate 52, a pair of holes 58 for inserting bolts for preventing the columnar portion 40 from being inserted is formed in a portion corresponding to the receiving portion 205.

  As shown in the partial sectional view of FIG. 4, the receiving portion 205 is bottomed by the contact plate 59. When the lower end portion of the columnar portion 40 is inserted into the receiving portion 205, the columnar portion 40 is positioned by the contact plate 59. In this state, a hole 58 formed in the front plate 51 and the back plate 52 and a pair of holes 41 formed in the lower end portion of the columnar portion 40 overlap each other. As a result, one bolt can be easily inserted into the hole 58 and the hole 41. By tightening the inserted bolt with a nut, the columnar portion 40 can be prevented from coming out of the receiving portion 205.

  Returning to FIG. 3, each of the left and right leg parts 201 and 203 has a pair of leg plates 53, a screw support part 60, a pressing member 61, a screw 63, and a handle 64. The pair of leg plates 53 are integrally connected to the front plate 51 and the contact plate 59 of the trunk portion 200 by welding. The screw support portion 60 is a member that supports the screw 63 by screwing, and is fixed by being sandwiched between a pair of leg plates 53. The pair of leg plates 53 and the screw support portion 60 are integrally connected by welding. In FIG. 3, the support 60 is embodied by a commercially available nut. Further, the pair of leg plates 53 are fastened by bolts and nuts, thereby increasing the strength against an external force that increases the distance between each other. A lever 64 for rotating the screw 63 manually is attached to the base end portion of the screw 63. On the other hand, a pressing member 61 is attached to the tip of the screw 63 to abut against the outer main surface of the flange 2 by advancing with the rotation of the screw 63 and press the outer main surface.

  Each of the left and right leg portions 202 and 204 has a pair of leg plates 54 and a pressing plate 65. The pair of leg plates 54 are integrally connected to the back plate 52 and the contact plate 59 of the trunk portion 200 by welding. The pressing plate 65 is located at a position facing the pressing member 61 and is fixed by being sandwiched between a pair of leg plates 54. The pair of leg plates 54 and the pressing plate 65 are integrally connected by welding. Similarly to the pair of leg plates 53, the pair of leg plates 54 are fastened by bolts and nuts, thereby increasing the strength against an external force that widens the distance between them. The pressing plate 65 corresponds to a specific example of the pressing member of the present invention, and cooperates with the pressing member 61 to play a role of tightening the outer main surface and the inner main surface of the flange 2. Note that the main surface of the rod 2 facing the outside of the loading platform 1 when the rod 2 is closed upward is referred to as an outer main surface, and the main surface facing inward is referred to as an inner main surface. As described above, the pedestal portion 50 has a clamp structure.

  FIG. 5 is an explanatory diagram showing a mounting state of the pedestal portion 50 to the flange 2. As shown in FIG. 5, the pedestal portion 50 having a clamp structure has an edge of the heel 2 when the heel 2 connected to the floor plate 3 of the loading platform 1 via the hinge 5 is closed upward. Attached to straddle. When the screw 63 is rotated to the right by manually operating the handle 64, the screw 63 advances and the pressing member 61 contacts the outer main surface of the heel 2 to press the outer main surface. At the same time, the pressing plate 65 facing the pressing member 61 abuts against the inner main surface of the flange 2 and presses the inner main surface. Thus, the base part 50 which has a clamp structure is fixed to the edge of the collar 2 by clamping and pinching the outer main surface and inner main surface of the collar 2. Therefore, it is possible to attach the pedestal portion 50 to the heel 2 without performing any processing on the heel 2.

  Some commercially available truck ridges 2 have square-shaped bulges along their edges. Of all the 100 types of commercial trucks investigated by the inventors of the present application, the cross-sectional dimension of the bulge is less than 50 mm with respect to the thickness of the heel 2 and the width from the edge of the heel 2 It was 50 mm or less. Therefore, the distance X between the leg plate 53 and the leg plate 54 facing each other is set to 50 mm or more, and the distance Y between the surface where the contact plate 59 contacts the edge of the flange 2 and the pressing member 61 is set to 50 mm or more. desirable. In other words, the pedestal portion 50 has a shape that can hold the heel 2 while holding the bulge so as not to interfere with the square-shaped bulge having a cross-sectional dimension of 50 mm × 50 mm that the heel 2 has along the edge. Is desirable.

  Some trucks have a ridge 2 that does not have a bulge at the edge, as depicted by the dotted line in FIG. The pedestal 50 configured not to interfere with the bulge can be attached to the heel 2 having no bulge without any problem. Further, the thickness of the heel 2 having no bulge was less than 50 mm as far as the above investigation was concerned. Therefore, the pedestal portion 50 having the intervals X and Y of 50 mm or more can be attached to all the cages 2 of the commercially available truck as long as the investigation is performed. That is, it can be said that this pedestal 50 is applicable to virtually all trucks in the country.

  The pressing member 61 includes an engaging member 66 that engages with the screw 63 and an elastic member 67 that is attached to the engaging member 66. When the screw 63 is rotated clockwise, a pressing force is transmitted to the elastic member 67 through the engaging member 66. The elastic member 67 abuts on the outer main surface of the flange 2. For this reason, the base part 50 can clamp the collar 2 without damaging the outer main surface of the collar 2. In addition, since the fastening force is stably maintained by the elastic restoring force of the elastic member 67, the pedestal portion 50 is stably fixed to the flange 2. The elastic member 67 is made of, for example, rubber, and more preferably, urethane that can obtain high strength.

  FIG. 6 is a partial cross-sectional view showing the structure of the pressing member 61. In FIG. 6, the engaging member 66 is embodied as a rectangular parallelepiped having a hollow inside. The screw 63 passes through the front wall of the engaging member 66, and the tip of the screw 63 faces or abuts on the inner surface of the back wall located on the opposite side of the front wall. An elastic member 67 is attached to the outer surface of the back wall facing the tip of the screw 63. The elastic member 67 is fixed to the back wall with, for example, a screw (not shown). A locking member 70 is attached to the screw 63 by welding, for example. The locking member 70 is, for example, an annular member. In FIG. 6, a washer is used as the locking member 70.

  The engaging member 66 is rotatable with respect to the screw 63. Thereby, the screw 63 can be smoothly rotated. In particular, the tip of the screw 63 protrudes at the central portion, and the top of the protruding portion abuts against and presses the central portion of the inner surface of the back wall of the engaging member 66, thereby applying a pressing force to the engaging member 66. The For this reason, the screw can be rotated more smoothly. Further, since the rotation of the elastic member 67 accompanying the rotation of the screw 63 is suppressed, there is an advantage that the elastic member 67 is not easily worn and the outer main surface of the flange 2 is not easily damaged. In particular, the pressing member 61 is slidably sandwiched between the pair of leg plates 53, whereby the rotation of the pressing member 61 is restricted by the pair of leg plates 53. That is, the pair of leg plates 53 corresponds to a specific example of the guide member of the present invention. For this reason, since the rotation of the elastic member 67 accompanying the rotation of the screw 63 is surely restricted, the wear of the elastic member 67 and the damage to the outer main surface of the flange 2 are further suppressed.

  On the other hand, the engaging member 66 is restrained in the axial direction of the screw 63 by the tip of the screw 63 and the locking member 70. For this reason, when the screw 63 is rotated counterclockwise, the pressing member 61 is not detached from the screw 63 as the screw 63 is retracted even after the pressing state of the heel 2 by the pressing member 61 is released.

  FIG. 7 is a schematic external view showing a mechanism in which the support column 10 supports the rope 31. One end of the rope 31 is detachably supported by the annular member 13 of the support 10 </ b> A via the carabiner 32. A tensioner 33 is attached to one end of the rope 31, and the rope 31 is supported by the annular member 13 via the tensioner 33 in addition to the carabiner 32.

  FIG. 8 is an external view showing the carabiner 32 and the tensioner 33 in an enlarged manner. The carabiner 32 has a ring-shaped portion, and has a lever 34 that can be opened and closed at a part of the ring-shaped portion. The lever 34 can be locked by another pin. The tensioner 33 has a lid that opens and closes. The tensioner 33 is put into use by closing the lid with the rope 31 interposed therebetween and fastening the screw 35. The tensioner 33 restrains the movement in one direction of the rope 31 and does not restrain the movement in the other direction. Therefore, after attaching the carabiner 32 to the annular member 13, the rope 31 can be tensioned with a desired strength by pulling one end of the rope 31. Further, the restraint state of the rope 31 can be released by tilting the lever 36 of the tensioner 33 in a predetermined direction. Therefore, the carabiner 32 can be easily removed from the annular member 13 by releasing the tension state of the rope 31 after the work of unloading the load on the loading platform 1 is completed.

  As illustrated in FIG. 1, the other end of the rope 31 is also detachably supported by the annular member 13 via a carabiner. The tensioner 33 may be attached to both ends of the rope 31, but if it is attached only to one end as shown in FIG. 1, it is sufficient to apply tension to the rope 31. The rope 30 is detachably supported by the annular members 11 (see FIG. 2) of the support columns 10A and 10B by a mechanism similar to the support mechanism of the rope 31.

  As described above, since the ropes 31 and 30 are supported by the support pillars 10A and 10B via the carabiner 32, the attachment work and the removal work of the ropes 31 and 30 to the support pillars 10A and 10B can be easily performed. . Further, since one end of each of the ropes 31 and 30 is supported by the support column 10A via the tensioner 33, a desired tension can be applied to the ropes 31 and 30. Further, by releasing the tension, the ropes 31 and 30 can be easily detached from the columns 10A and 10B.

  FIG. 9 is an enlarged external view showing a mechanism in which the rope 31 supports the net 20. A thread or rope 21 and a rope 31 along the edge of the net 20 are detachably connected by a carabiner 22. In the carabiner 22 depicted in FIG. 9, the openable / closable lever can be locked by a hook-shaped protrusion provided on a part of the ring-shaped portion. The carabiner 22 is attached to the rope 21 at an appropriate interval. The rope 30 supports the net 20 by a mechanism similar to the mechanism in which the rope 31 supports the net 20. Thus, since the net | network 20 is detachably attached to the ropes 31 and 30 via the carabiner 22, the attaching operation | work to the ropes 31 and 30 of the net | network 20 and a removal operation | work can be performed easily.

  8 and 9 exemplify carabiners having a specific structure, but carabiners having other structures may be used as long as they are detachably connected.

(Device assembly method)
10 to 14 are process diagrams showing a process of assembling the fall prevention device 500 on the loading platform 1. These steps can be performed by personnel. In order to assemble the device 500, first, as shown in FIG. Here, the base part 50 shall be attached to the four corners of the loading platform 1. In order to attach the pedestal portion 50, the body portion 200 is placed on the heel 2 so that the contact plate 59 (see FIG. 3) is brought into contact with the edge of the heel 2. Thereafter, the pair of handles 64 are rotated to the right so that the legs 201 to 204 tighten the outer main surface and the inner main surface of the heel 2. Thereby, the base part 50 is fixed to the eaves 2.

  Next, as shown in FIGS. 11 and 12, the columnar portion 40 is attached to each pedestal portion 50. In order to attach the columnar portion 40 to the pedestal portion 50, the columnar portion 40 is lifted on the loading platform 1 in an upright state, and the lower end portion thereof is inserted into the receiving portion 205 (see FIG. 4) of the pedestal portion 50. Thereafter, a bolt is inserted into the hole 58 and the hole 41, and the bolt is tightened with a nut, whereby the columnar part 40 can be brought upright on the base part 50. Thereafter, the reinforcing member 360 is attached to the columnar portion 40 and the pedestal portion 50 using bolts and nuts. Subsequently, a tension is applied to the reinforcing member 360 by rotating the turnbuckle 361 (see FIG. 2) of the reinforcing member 360. Through the above steps, the column erecting step for erecting the column 10 on the outer periphery of the loading platform 1 is completed. In addition, as shown in FIG. 12, the support | pillar 10 provided in the right front of the loading platform 1 is represented by the code | symbol 10C as needed, and the support | pillar 10 provided in the right rear is represented by the code | symbol 10D as needed. Further, the heel 2 is described as a left heel 2L, a right heel 2R, and a rear heel 2B when it is particularly necessary to distinguish them.

  Next, as shown in FIG. 13, an operation of expanding the net 20 between the support 10A and the support 10B is performed. One end edge of the net 20 is attached to the rope 30 via a carabiner 22 (see FIG. 4), and the other end edge is attached to the rope 31 via a carabiner 22. In the example of FIG. 13, the vicinity of the center of the both end edges of the mesh 20 is attached to the rope 37 via the carabiner 22 in order to make it possible to adjust the height at which the mesh 20 is developed. In this way, the ropes 30 and 31 are attached to the net 20 and, if necessary, the rope 37 is attached in advance. Further, a carabiner 32 and a tensioner 33 (see FIG. 8) are attached to the ropes 30, 31 and 37 in advance.

  In order to unfold the net 20, first, the ropes 30 and 31 are attached to the annular members 13 and 11 (see FIG. 2) of the columns 10A and 10B via the carabiner 32 (see FIG. 7). FIG. 13 illustrates a state after attachment. Then, tension | tensile_strength is provided to the ropes 30 and 31 by pulling the edge part of the ropes 30 and 31 in the side to which the tensioner 33 is attached, and the ropes 30 and 31 will be in a tension | tensile_strength state.

  Next, returning to FIG. 1, the horizontal end of the net 20 is connected to the support columns 10 </ b> A and 10 </ b> B with a string (string) 25 or the like. Through the above steps, the net unfolding step for unfolding the net 20 between the columns 10A and 10B as shown in FIG. 1 is completed. The net 20 can be developed between the columns 10C and 10D through the same net development process. Moreover, as shown in FIG. 14, the net | network 20 can be expand | deployed also between the support | pillar 10B and the support | pillar 10D, ie, the back of the loading platform 1, through the same process. Moreover, although illustration is abbreviate | omitted, the net | network 20 can be expand | deployed also between the support | pillar 10A and the support | pillar 10C, ie, the front of the loading platform 1, through the same process. As described above, the fall prevention device 500 can be installed on the loading platform 1 by a simple manual operation.

(Function and advantage of the device)
FIG. 15 is a schematic explanatory diagram illustrating functions and advantages of the fall prevention device 500. When the cargo vehicle 600 piled with the load 90 enters the unloading work place, the fall prevention device 500 is installed on the loading platform 1 according to the steps shown in FIGS. Thereby, the net | network 20 is expand | deployed above the outer peripheral part of the loading platform 1. FIG. Then, as shown in FIG. 15, the operation | work which unloads the heavy load 90 from the loading platform 1 using a crane is performed. In FIG. 15, H-shaped steel is depicted as an example of the load 90.

  When unloading the load 90 from the loading platform 1 using a crane, as shown in FIG. 15, a person 100 climbs on the loading platform 1 or the loading object 90 and uses a lifting tool such as a wire rope. Thus, it is necessary to prepare for hanging the load 90 on the hook 91, or to perform a work (a so-called sling) such as making a signal and lifting the load 90 at a predetermined position. At this time, as shown schematically in FIG. 16, the load 100 may lose the center of gravity of the body or the scaffolding due to unexpected movement of the load 90 or the like. Even if such an unexpected situation occurs, the deployed net 20 receives the body of the personnel 100 and prevents the personnel 100 from falling from the loading platform 1.

  Further, unlike the case of using a rigid fence as in the prior art disclosed in Patent Document 1, the flexibility of the net 20 has the advantage that the impact received by the personnel 100 when receiving the body is light. It is done. Furthermore, since the net | network 20 receives a body flexibly, the danger that the personnel 100 will be pressed by the load 90 which moves unexpectedly is reduced. Further, due to the flexibility of the net 20, the personnel 100 can work on the loading platform 1 or the load 90 while pushing the net 20 to some extent with a part of the body such as an arm. That is, the freedom of body freedom by the net 20 is gradual, and the work space of the narrow and limited carrier 1 is substantially widened. Furthermore, since the restraint of freedom of the body is gentle, the mental pressure of the person 100 who works on the narrow carrier 1 is reduced. As described above, the fall prevention device 500 increases the safety on the loading platform 1 and at the same time improves the workability.

  Moreover, since the fall prevention apparatus 500 uses the lightweight net | network 20 as a member which receives the body of the personnel 100, it is lightweight also as the whole apparatus. Moreover, since the support | pillar 10 can be attached or detached, the fall prevention apparatus 500 can be removed while driving | running | working the cargo vehicle 600. FIG. Due to the light weight of the device and the indefinite shape of the mesh 20, the fall prevention device 500 can be compactly loaded on the loading platform 1 of the cargo vehicle 600 in a disassembled state when not in use.

  In FIG. 1, an example is shown in which the net 20 has a lateral length close to the interval between the column 10A and the column 10B. However, the same net | network 20 can be expand | deployed also between the support | pillar 10A and the support | pillar 10B with a narrow space | interval. In this case, the net 20 is deployed with a margin in the lateral direction, but the effect of receiving the body of the person 100 remains unchanged. Therefore, by preparing sufficiently long nets 20 and ropes 30 and 31, it is possible to install the same fall prevention device 500 in various cargo vehicles 600 having different loading platform 1 lengths. It becomes. Moreover, it is also possible to use the net | network 20 and the ropes 30 and 31 of the same dimension in the left-right side of the loading platform 1, and the front and back. Further, a set of members before assembling the fall prevention device 500 is prepared and entered at a work site where various cargo vehicles 600 having different lengths of the loading platform 1 enter and unload the load 90. It is also possible to adopt a usage pattern in which the same fall prevention device 500 is installed in the cargo vehicle 600.

  As described above, the fall prevention device 500 configured to deploy the net 20 between the pillars 10 has a simple configuration, but in various points such as safety, workability, portability, and flexibility of application. The cargo vehicle 600 is suitable for use on the loading platform 1. Moreover, since the support | pillar 10 is what is attached to the eaves 2 with the clamp structure which the base part 50 has, it is not necessary to give any processing to the commercial cargo vehicle 600. FIG. Further, since the column 10 is not supported by the floor plate 3 of the loading platform 1 but supported by the eaves 2, the floor plate 3 of the loading platform 1 can be widely used for loading the load 90.

  1 and 4 show an example in which the net 20 is deployed in front, rear, left, and right of the loading platform 1, but various deployment methods can be adopted depending on the situation of the work site and the work content. . For example, when there is a risk of falling of the personnel 100 only on the left side of the loading platform 1, the personnel 100 can be obtained by installing only the columns 10A and 10B as the column 10 and deploying the net 20 between them. It is possible to achieve the purpose of ensuring safety. Alternatively, when there is a risk of falling of the personnel 100 only on the left side and the right side of the loading platform 1, four columns 10A to 10D are erected between the columns 10A and 10B and the column 10C. It is also possible to adopt an installation form in which the network 20 is deployed only during 10D.

  As shown in FIGS. 1 and 12, a cargo vehicle 600 embodied as a truck is usually provided with a so-called torii 6 as a wall surface or a fence-like structure in front of the loading platform 1. is there. Also in the loading platform 1 provided with the torii 6, when the load 90 is piled up tall and there is a possibility that the personnel 100 may work at a height exceeding the torii 6, the net 20 is also provided in front of the loading platform 1. There is a significance to deploy. Even if there is no fear of exceeding the torii 6, it is desirable to deploy the net 20 in front of the loading platform 1 in order to reduce the impact of the body at the time of falling.

  Further, when four struts 10A to 10D are erected at the four corners of the loading platform 1 and the net 20 is deployed in four directions on the front, rear, left and right of the loading platform 1, the four supporting columns 10A to 10D are Since they are connected to each other by the rope 31, the shock load generated when the net 20 receives the body of the person 100 is distributed to all the four columns 10 </ b> A to 10 </ b> D. That is, since the four struts 10A to 10D cooperate to support a load acting on a part of the net 20, concentration of the load on any of the struts 10A to 10D is reduced. In particular, since the collar 2 has a structure that does not tilt inward beyond the state in which it is closed upward, an outward load acting on one of the left and right nets 20 can be effectively supported by the other column. . Even when the four struts 10A to 10D are erected at the four corners of the loading platform, even when the mesh 20 is deployed only on the left side and the right side of the loading platform 1, only the rope 31 is attached to the loading platform 1. By spanning forward and backward, the same load distribution effect can be obtained.

  1 and 14 show an example in which the net 20 is unfolded between the rope 30 and the rope 31 in a state where the net 20 is gently suspended. In contrast, as shown in FIG. 17, the net 20 may be deployed between the rope 30 and the rope 31 in a tensioned state. Depending on the relationship between the length of the mesh 20 in the vertical direction and the distance between the annular member 13 and the annular member 11 (see FIG. 2) attached to the support column 10, the form of deployment of the mesh 20 differs.

  When the deployment of the net 20 is excessively loose, the person 100 who is about to fall down jumps out of the loading platform 1 and is received by the net 20 near the ground. In this case, the configuration is the most excellent in that the pressure from the load 90 is avoided. On the other hand, when the net 20 is deployed in an excessively tensioned manner, the personnel 100 does not protrude from the outside of the loading platform 1, and there is an advantage that the impact of the falling is not required. The advantage of the net 20 that avoids compression is weakened compared to the case where the net 20 is loose. However, even in that case, the fall prevention device 500 has an advantage in terms of avoiding pressure as compared to a rigid fence. It is advisable to select the form of deployment of the network 20 as appropriate according to the situation at the site.

(Process to change the height of the net)
FIG. 18 is a process diagram showing an operation process for changing the height of the net 20. As the work for lowering the load 90 (see FIG. 15) piled up on the loading platform 1 proceeds, the height of the load 90 decreases. When the load 90 is lowered to a certain level or less, as shown in FIG. 18, after the rope 37 is attached to the protrusion 12 and is tensioned, the tension of the rope 31 is released, and the rope 31 is further connected to the annular member 13 (FIG. 2). As a result, as shown in FIG. 19, the mesh 20 is deployed between the rope 37 and the rope 30, and the height of the deployed mesh 20 is the center of the columnar portion 40 provided with the protrusions 12. It will be lowered to the vicinity of the club. Accordingly, it is possible to prevent the personnel 100 working on the lowered load 90 from falling, and when the load 90 is lifted by the hook 91, the load 90 in the air interferes with the net 20. This can be prevented. That is, when lifting the load 90, the restriction on the posture of the load 90 in the air is released immediately after lifting. As a result, the work efficiency of the work for lowering the load 90 is improved. Note that the rope 37 can also be hung on the support columns 10A and 10B at the same time in the process of FIG. 13 where the ropes 30 and 31 are hung.

  When loading the load 90 on the loading platform 1, it is preferable to first deploy the net 20 between the rope 30 and the rope 37 as shown in FIG. 19. As the work progresses thereafter, as shown in FIG. 18, the rope 31 is attached to the annular member 13 (see FIG. 2) and tension is applied, so that the rope 31 is stretched between the support 10A and the support 10B. good. Thereby, the net | network 20 can be expand | deployed between the rope 30 and the rope 31, as shown in FIG. In this case, the rope 37 can be left over without being removed thereafter.

(The form which added the reinforcement member)
As illustrated in FIG. 20, the support column 10 can be reinforced by the reinforcing member 110 that connects the support column 10 and the flange 2. In the example of FIG. 20, the other ends of the reinforcing members 110B and 110D each having one end attached to each of the columns 10B and 10D are attached to the rear collar 2B via clamps 111B and 111D. One end of the reinforcing member 110B is detachably attached by a bolt and a nut (not shown) to a hole provided in a projection (not shown) attached in the vicinity of the center portion of the column 10B. Further, the other end of the reinforcing member 110B is detachably attached to the clamp 111B that is detachably attached to the rear heel 2B by tightening over the end edge of the rear heel 2B. Similar to the reinforcing member 360, the reinforcing member 110B has a turnbuckle 112 that applies tension to itself. The reinforcing member 110D has a structure equivalent to that of the reinforcing member 110B, and is attached to the column 10D and the rear rod 2B by an equivalent mechanism.

  The reinforcing member 110B functions to reinforce the columnar portion 40 by connecting the column 10B and the rear rod 2B with tension. As already described, when the net 20 receives the body of the person 100 who is about to fall, shocking tension is applied to the ropes 30 and 31. As a result, a force for pulling down the rope 30 in the direction in which the rope 30 is stretched acts on the columnar portion 40 that supports the rope 31. The load acting on the column 10B when the net 20 deployed between the column 10A and the column 10B receives the body of the person 100 is in a direction to tilt the columnar portion 40 of the column 10B forward of the loading platform 1. Mainly works. At the same time, a load for tilting the columnar portion 40 of the column 10B toward the left side of the loading platform 1 also acts on the column 10B. The reinforcing member 110 </ b> B relieves a large moment applied to the lower end portion of the reinforcing member 40 and the receiving portion 205 of the pedestal portion 50 by adding a reaction against the load to the columnar portion 40, and to the left side of the columnar portion 40. Restrains the tilting. In other words, the reinforcing member 110B functions to increase the strength of the entire column 10B against a load that tends to tilt the columnar portion 40 of the column 10B to the left. Similarly, the reinforcing member 110D functions to increase the strength of the entire support column 10D with respect to a load that tends to tilt the columnar portion 40 of the support column 10D to the right.

(Example of diversion of equipment members)
21 and 22 are schematic explanatory views showing an example in which a part of the fall prevention device 500 is diverted to other uses. In the example of FIG. 21, the columns 10 </ b> A to 10 </ b> D are diverted for the purpose of preventing load collapse of the load 95 on the loading platform 1. In this case, it is desirable to route the ropes 120 and 121 between the column 10A and the column 10C and between the column 10B and the column 10D, respectively. Thereby, the pillars 10A to 10D can support the load 95 with higher strength. The ropes 120 and 121 are preferably attached to the columns 10A to 10D via the carabiner 32 and the tensioner 33 (see FIG. 8) in the same manner as the rope 31, and the rope 31 may be diverted as it is.

  In the example of FIG. 22, the columns 10 </ b> A to 10 </ b> D are used as columns that support the hood 130 that protects the load on the loading platform 1 from rain or the like.

  As described above, the fall prevention device 500 can be used for other purposes specific to the freight vehicle 600 by taking advantage of the characteristic that it can be mounted on the vehicle and keeping a part thereof attached to the loading platform 1 of the freight vehicle 600. It can be diverted. Thereby, even after the loading / unloading operation of the load 90 is completed, it is possible to effectively use the members that are still attached to the loading platform 1 while omitting the trouble of removing all the members of the fall prevention device 500 from the loading platform 1. it can.

(Other embodiments)
(1) FIG. 23 is a perspective view showing another embodiment of the pedestal portion of the column 10. FIG. 24 is a partial cross-sectional view showing a usage state of the pedestal portion. The pedestal portion 150 includes the pedestal portion 50 shown in FIG. 3 and another receiving portion 151 attached to the pedestal portion 50. The receiving part 151 is provided in order to make it possible to stand the columnar part 40 in a state where the collar 2 is opened downward. When the eaves 2 are opened downward, the eaves 2 are attached to the support member 160 protruding downward from the floor plate 3 of the loading platform 1 and come into contact with the eaves contact member 161 made of rubber or the like. There is no. Therefore, the tilting of the columnar section 40 due to the load generated when the net 20 receives the body of the person 100 (see FIG. 16) can be stably regulated by the rod 2.

  The receiving portion 151 is fastened and fixed to the front plate 51 with a bolt, and receives the insertion of the lower end portion of the columnar portion 40, thereby fulfilling the function of supporting the columnar portion 40 in a fixed manner. The receiving portion 151 is preferably bottomed, and when the lower end portion of the columnar portion 40 is inserted, the columnar portion 40 is positioned by the bottom of the receiving portion 151. In this state, the hole 152 formed in the receiving portion 151, the hole 153 formed in the front plate 51, and the pair of holes 41 formed in the lower end portion of the columnar portion 40 overlap each other. As a result, one bolt 154 can be easily inserted into the hole 152 and the hole 153. By tightening the inserted bolt 154 with a nut, the columnar portion 40 can be prevented from coming out of the receiving portion 151. The hole 153 formed in the front plate 51 can also serve as the hole 58 (see FIG. 3).

  The pedestal portion 150 is formed by attaching another receiving portion 151 to the pedestal portion 50 (see FIGS. 3 and 4) that already has the receiving portion 205. Therefore, the pedestal 150 allows the columnar portion 40 to be raised by being attached to the heel 2 regardless of whether the heel 2 is closed upward or in a state where it is opened downward. That is, the pedestal unit 150 can be used properly according to the situation of the work place. Moreover, since the receiving part 151 is attached to the base part 50 so that attachment or detachment is possible with a volt | bolt, it is also possible to attach to the base part 50 and use it only when needed.

  Further, the attaching operation of the pedestal 150 to the heel 2 can be performed in a state where the heel 2 is closed upward, and then the heel 2 is opened downward to attach the columnar portion 40. Similarly, the removal work of the pedestal part 150 from the ridge 2 can be performed by removing the columnar part 40 from the pedestal part 150 and then closing the ridge 2 upward. In this way, the pedestal portion 150 can be easily attached to and detached from the heel 2.

  25 and 26 are schematic explanatory diagrams of the work of unloading the load 90. When the heavy load 90 on the loading platform 1 is lowered using a crane, the wire rope 302 for hanging on the hook 91 of the crane is passed through the side and the lower side of the load 90 to be lifted (hanging) One of the tasks). As shown in the right side fence 2R illustrated in FIG. 25, when the fence 2 is in a state of being closed upward, a narrow gap between the fence 2 and the load 90, and the flooring 301, depending on how the load 90 is stacked. In some cases, it may be difficult to pass the wire rope 302 through the gap between the floor board 1 and the load 90 made by the above-described method.

  In such a case, as in the port 2L illustrated in FIGS. 25 and 26, when the rod 2 is open downward, the operation of passing the wire rope 302 can be performed efficiently. If the pedestal 150 is used, the net 20 can be deployed above the outer periphery of the loading platform 1 with the basket 2 opened downward, so that the safety of the personnel 100 (see FIGS. 15 and 16) who perform the work can be improved. While aiming, the slinging operation can be performed efficiently. Since the net 20 is flexible, it does not prevent the personnel 100 from performing such a slinging operation inside the net 20. Even when the pedestal portion is attached to the rear lid 2B, if the pedestal portion 150 is used, it is possible to efficiently perform the slinging operation at the rear portion of the loading platform 1 while ensuring safety.

  (2) FIG.27 and FIG.28 is a figure for demonstrating the fall prevention apparatus assembled by standing upright on a loading platform, without using the base parts 50 and 150. FIG. FIG. 27A is a schematic plan view of a freight vehicle 601 as a trailer vehicle, and FIG. 27B is a cross-sectional view of the cargo bed 160 taken along the line PP in FIG. 27A. In a commercially available trailer vehicle, a mounting hole 161 for inserting a column 162 for preventing load collapse is generally formed in the floor plate of the loading platform 160. The attachment hole 161 is disposed along the outer periphery of the loading platform 160.

  As shown in FIG. 28, by appropriately setting the width of the columnar portion 40, the columnar portion 40 can be detachably fixed to the loading platform 160 using the attachment holes 161. As shown in FIG. 28, it is possible to insert the lower end portion of the columnar portion 40 into the mounting hole 161 at a predetermined depth by providing a locking projection 164 on the side surface near the lower end portion of the columnar portion 40. It becomes. The protrusion 164 has a hole, and functions as an annular member for attaching the rope 30 (see FIG. 1) similarly to the annular member 11. The protruding portion 164 is attached to the columnar portion 40 by welding, for example, similarly to the protruding portion 12.

  The column 310 configured as described above is used as a column for unfolding the net 20 by spanning the ropes 30, 31, and 37 without using the pedestals 50 and 150, similarly to the column 10 (FIG. 2) of the fall prevention device 500. be able to. On the other hand, the column 310 can be used as a columnar portion attached to the pedestal portions 50 and 150 in the same manner as the columnar portion 40 shown in FIGS. Furthermore, it is also possible to divert only the column 310 as a column for preventing the collapse of the load like the commercially available column 162 without installing the ropes 30, 31, 37 and the net 20.

  If the columnar portion 40 only needs to be diverted to a column for preventing collapse of the load and it is not necessary to use it as a column for deploying the net 20 on the loading platform 160, a columnar shape as illustrated in FIG. It is only necessary to provide the protrusion 163 having a simpler structure at the lower end of the portion 40. The protruding portion 163 is formed by attaching a sheet metal piece having a required thickness to the columnar portion 40 by welding, for example. Both the protrusions 163 and 164 attached to the lower end of the columnar part 40 are also used as locking members that determine the insertion position of the columnar part 40 when the receiving parts of the base parts 50 and 150 are bottomless. You can also.

  (3) FIG. 30 is a front view showing an example in which the support column 10 is extendable. The column 170 has a fixed columnar portion 171 and a movable columnar portion 172 as the columnar portion 173. The fixed columnar portion 171 is detachably fixed to the pedestal portion 50 at its lower end, similarly to the columnar portion 40 (see FIG. 2). The fixed columnar portion 171 is formed in a cylindrical shape or a tubular shape, and thereby accommodates the movable columnar portion 172 so as to be slidable. A rack gear 174 is engraved on one side surface of the movable columnar portion 172. Near the upper end portion of the fixed columnar portion 171, a gear box 175 that houses a combination gear for expanding and contracting the movable columnar portion 172 by transmitting the rotation of the handle 176 to the rack gear 174 is provided. A stopper 177 is provided near the upper end of the fixed columnar portion 171 to restrict the free fall of the movable columnar portion 172 by engaging with a gear in the gear box 175.

  If the extendable strut 170 is used, the height of the net 20 deployed on the loading platform 1 can be easily changed. In addition, the height of the net 20 can be changed continuously instead of stepwise. Furthermore, after attaching the rope 31 to the support column 170 at a low position where it is easy to work, it is possible to raise the support column 170 and expand the net 20 high. That is, the rope 31 can be easily attached to and detached from the support post 170.

  (4) FIG. 31 is a perspective view illustrating a pedestal portion that is detachably fixed to the collar 2 with screws. The pedestal portion 180 is formed in the same manner as the receiving portion 151 illustrated in FIG. The hole 181 corresponds to the hole 151. Therefore, the columnar portion 40 can be fixed by inserting the lower end portion of the columnar portion 40 into the pedestal portion 180 and fastening with the bolt.

  The pedestal portion 180 can be formed to be simpler and lighter than the pedestal portion 50. In FIG. 31, the pedestal portion 180 is bottomed, but the pedestal portion 180 may be formed without a bottom, and the lower end of the columnar portion 40 may be supported by the floor plate 3. Alternatively, the pedestal portion 180 may be formed without a bottom, and the column 310 of FIG. 28 or the columnar portion 40 of FIG. 29 may be inserted and used. Furthermore, in FIG. 31, although the base part 180 is attached to the inner main surface of the collar 2, it can also be used by attaching to the outer main surface. When the columnar part 40 of FIG. 2 or FIG. 29 is used as the columnar part inserted into the pedestal part 180, a tubular member (not shown) for attaching the rope 30 may be attached to the side wall surface of the pedestal part 180. . The tubular member can be formed in the same manner as the tubular member 11 (see FIGS. 2 and 3) or the protrusion 12 (see FIG. 2).

  (5) The fall prevention device according to the above embodiment deploys the net 20 between the plurality of support columns 10 via the ropes 30 and 31. On the other hand, it is also possible to expand the mesh 20 between the columns 10 by tying the mesh 20 to the tubular members 11, 13 and the like of the support column 10 without using the ropes 30 and 31.

  (6) Although the fall prevention device according to each of the above embodiments is attached to the loading platform of a large truck including a trailer, it can be applied to general cargo vehicles including a railway vehicle.

1 is a schematic side view of a cargo vehicle including a fall prevention device according to an embodiment of the present invention. It is a front view which shows the whole structure of the support | pillar of FIG. It is a perspective view which shows the structure of the base part of FIG. It is a fragmentary sectional view of the base part of FIG. It is explanatory drawing which shows the attachment state to the collar of the base part of FIG. It is a fragmentary sectional view of the base part of FIG. It is the external appearance schematic which shows the mechanism in which a support | pillar supports a rope. It is an expansion external view of the carabiner and tension device of FIG. It is an expansion external view which shows the mechanism in which a rope supports a net | network. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is process drawing which shows the process of assembling the fall prevention apparatus of FIG. 1 on a loading platform. It is a schematic explanatory drawing which shows the function and advantage of the fall prevention apparatus of FIG. It is a schematic explanatory drawing which shows the function and advantage of the fall prevention apparatus of FIG. It is a side view which shows another usage pattern of the fall prevention apparatus of FIG. It is process drawing which shows the process of changing the height of the net | network of the fall prevention apparatus of FIG. It is explanatory drawing which shows the advantage which adjusts the height of the net | network of the fall prevention apparatus of FIG. It is a perspective view which shows the example which attached another reinforcement member to the fall prevention apparatus of FIG. It is a schematic explanatory drawing which shows the diversion example of the member of the fall prevention apparatus of FIG. It is a schematic explanatory drawing which shows another example of diversion of the member of the fall prevention apparatus of FIG. It is a perspective view which shows the base part by embodiment different from FIG. It is a fragmentary sectional view which shows the use condition of the base part of FIG. It is explanatory drawing which shows the advantage of the base part of FIG. It is explanatory drawing which shows the advantage of the base part of FIG. It is a schematic explanatory drawing of a commercial trailer vehicle. It is a figure which shows the support | pillar of the fall prevention apparatus by embodiment different from FIG. It is a figure which shows the columnar part by embodiment different from FIG. It is a figure which shows the support | pillar by embodiment different from FIG. It is a perspective view which shows the base part by embodiment different from FIG.3 and FIG.24.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,160 Loading platform 2L 2L Left side 2R Right side 2B Rear end 3 Floor board 10,10A-10D, 170,310 Post 11,11 Annular member 12 Protrusion part (tubular member) 20 Net 22, 32 Carabiner 30, 31, 37 , 81, 82 Rope 33 Tensioner 40, 173 Column 50, 150, 180 Base 53, 54 Leg plate (guide member) 59 Contact plate (contact member)
60 Screw support portion 61 Press member 63 Screw 65 Press plate (press member) 66 Engagement member 67 Elastic member 100 Person 110B, 110D, 360 Reinforcement member 112, 361 Turnbuckle 151, 205 Receiving portion 161 Hole 163, 164 Protrusion portion 163 , 164 Protrusion 500 Fall prevention device 600, 601 Cargo vehicle

Claims (37)

A fall prevention device for preventing personnel from falling from a cargo carrier bed,
A plurality of support columns detachably provided on the outer periphery of the loading platform;
A fall prevention device comprising: a net developed between each of the plurality of columns and a column adjacent to each column along the outer periphery. Further comprising a rope spanned at two or more different heights between each of the plurality of struts and a strut adjacent to each strut along the outer periphery;
The fall prevention device according to claim 1, wherein the net is developed between the ropes having different heights.   The fall prevention device according to claim 2, wherein each of the plurality of support columns has an annular member for attaching the rope to two or more portions having different heights.   The fall prevention device according to claim 3, wherein the two or more parts are three or more parts having different heights.   The fall prevention device according to claim 3 or 4, wherein each of the ropes is detachably supported by the annular member via a carabiner.   The fall prevention device according to any one of claims 2 to 5, wherein one end of each rope is supported by a corresponding support via a tensioner.   The fall prevention device according to any one of claims 2 to 6, wherein the net is detachably attached to the ropes having different heights via a carabiner. The plurality of struts are erected at portions corresponding to at least four corners of the loading platform,
The net is deployed at least on the left and right sides of the loading platform,
Of the four struts erected at the part corresponding to the four corners of the cargo bed, the stanchion is erected between the part erected at the left front part and the part erected at the right front part, and at the left rear part. The fall prevention device according to any one of claims 2 to 7, wherein a rope is also stretched between the installed one and the one installed on the right rear part.   The fall prevention device according to any one of claims 1 to 7, wherein the plurality of support columns are erected at portions corresponding to at least four corners of the loading platform.   The fall prevention device according to claim 9, wherein the net is developed at least on the left and right sides of the loading platform.   The fall prevention device according to claim 10, wherein the net is also developed behind the loading platform.   The fall prevention device according to claim 10 or 11, wherein the net is also deployed in front of the loading platform.   The fall prevention device according to any one of claims 1 to 12, wherein each of the plurality of support columns is extendable.   The fall prevention device according to any one of claims 1 to 13, wherein the plurality of columns are attached to a floor plate of the loading platform.   The fall prevention device according to claim 14, wherein the plurality of support columns are attached to the floor board by inserting lower end portions into holes provided in the floor board.   The fall prevention device according to claim 15, wherein each of the plurality of support columns has a protruding portion that abuts on an edge of the hole on a side surface in the vicinity of its lower end.   The fall prevention device according to any one of claims 1 to 13, wherein the plurality of support columns are attached to a bag of the cargo bed. Each of the plurality of struts is
A pedestal portion detachably attached to the bag;
The fall prevention device according to claim 17, further comprising: a columnar portion that stands on the pedestal portion by detachably attaching a lower end to the pedestal portion. The pedestal is
The fall prevention device according to claim 18, further comprising a clamp structure that is fixed to the ridge by clamping and clamping one main surface and the other main surface of the ridge across the edge of the ridge. The clamp structure is
A contact member that contacts the edge;
A screw that advances and retreats toward the one main surface with rotation;
A screw support part that is connected to the contact member and is screwed into the screw to support the screw;
A pressing member connected to the abutting member and abutting against the other main surface;
The one main surface and the other main surface are tightened in cooperation with the pressing member by being attached to the end portion of the screw and abutting against the one main surface by the advancement of the screw and pressing the one main surface. The fall prevention device according to claim 19, further comprising a pressing member. The pressing member is
An engagement member that is freely restrained in the rotational direction of the screw and is restrained while allowing play in the axial direction of the screw, and engages with the screw;
The fall prevention device according to claim 20, further comprising: an elastic member attached to a side of the engaging member facing the one main surface.   The center of the tip of the screw protrudes, and a pressing force is applied to the engagement member when the top of the protrusion abuts against and presses a part of the engagement member. Fall prevention device. The clamp structure is
The fall prevention device according to claim 21 or 22, further comprising a guide member that guides the engaging member to be slidable in an axial direction of the screw while restricting rotation of the engaging member around the axis of the screw. .   24. The clamp structure according to any one of claims 20 to 23, wherein the clamp structure includes a set of the contact member, the screw, the screw support portion, the pressing member, and the pressing member at a plurality of portions along an edge of the flange. The fall prevention device described in 1. The clamp structure is
The fall prevention device according to any one of claims 19 to 24, which has a shape capable of sandwiching the ridge in a state where the ridge has a square-shaped bulge having a cross-sectional dimension of 50 mm x 50 mm along its edge. The pedestal is
The member connected to the said clamp structure thru | or the member which comprises a part of said clamp structure has a cylindrical receiving part which supports the said columnar part by accepting insertion of the lower end part of the said columnar part. The fall prevention device according to any one of the above.   The fall prevention device according to claim 26, wherein the receiving portion is bottomed.   A member that removably connects the pedestal part and the columnar part attached to the pedestal part, further comprising a reinforcing member that restrains the tilting of the columnar part around the receiving part with tension. Item 26 or 27.   A member for detachably connecting between the flange and the columnar part attached to at least one pedestal part of the plurality of support columns, and for reinforcing the tilting of the columnar part around the receiving part with tension 28. The fall prevention device according to claim 26 or 27, further comprising a member.   30. The fall prevention device according to claim 29, wherein the pedestal portion of the at least one support column is attached to a side rod, and one end of the reinforcing member is attached to a rear rod.   The fall prevention device according to any one of claims 28 to 30, wherein the reinforcing member has a turnbuckle for generating the tension.   32. The fall prevention device according to claim 26, wherein the columnar portions of the plurality of support columns have a protrusion on a side surface near a lower end portion of the column.   The fall prevention device according to any one of claims 19 to 32, wherein the pedestal portion makes it possible to stand the columnar portion when the heel is closed upward.   The fall prevention device according to any one of claims 19 to 32, wherein the pedestal portion makes it possible to stand the columnar portion when the heel is in a state of hanging downward.   A cargo vehicle comprising the fall prevention device according to any one of claims 1 to 34. A cargo vehicle to which the fall prevention device according to any one of claims 1 to 13 and 17 can be attached,
A freight vehicle having a cylindrical receiving portion that supports the column by receiving insertion of a lower end portion of the column at a bag. A method for assembling the fall prevention device according to any one of claims 2 to 8,
A column erecting step of detachably erecting the plurality of columns on the outer periphery of the cargo bed,
A rope that supports at least both ends of the mesh is spanned at two or more different heights between each of the plurality of struts and a strut adjacent to each strut along the outer periphery. A net unfolding step of unfolding above the outer periphery of the loading platform;
A method for assembling the fall prevention device.

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