JP2010077607A - Handrail of construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily mount a handrail by a single worker. <P>SOLUTION: This handrail 20 includes a handrail body 21, one end of which is fixed onto a top surface of a fuel tank 8, the other end of which is fixed to a frame 4a, and which has an elastic member 24 fitted into an end-side mounting portion 23 provided at the end of a linear portion 21a. The handrail 20 is fixed to a base 13 which is provided on the top surface of the fuel tank 8, and inserted into an end-fixing cylinder 22 inside which a pair of pressing walls 25 are provided in parallel. The one end-side mounting portion 23 of the handrail body 21 is inserted into the end-fixing cylinder 22, and turned by an angle of 90°, so as to compress the elastic member 24 with the pressing wall 25. A bayonet groove 26 is provided in the end-fixing cylinder 22, and a protrusion 27 is provided in the handrail body 21. The protrusion 27 is displaced in a sliding manner from an introduction groove portion 26a of the bayonet groove 26 via a guide groove portion 26b provided circumferentially on the end-fixing cylinder 22 up to a lock groove portion 26c, and then is stopped turing and prevented from coming off by the lock groove portion 26c. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a handrail that is provided in a construction machine including a hydraulic excavator and other upper structure having a cab or the like for a lower structure having traveling means, and is used as a clue when going up and down the upper structure. Is.

  As a construction machine, for example, a hydraulic excavator is installed in a lower traveling body so that an upper swing body can swing through a swing device. The upper turning body is provided with working means for performing work such as excavation of earth and sand, and a cab is installed. Further, the upper swing body is provided with a building that constitutes a machine room, and further, a fuel tank and a hydraulic oil tank are also installed.

  An operator gets on the cab and operates the machine. A handrail is provided in the vicinity of the cab door for the operator to get on and off the cab. The door in the cab is provided on one side, and working means is provided on the opposite side of the door. Furthermore, in the upper revolving structure, the fuel tank and the hydraulic oil tank are usually arranged on the opposite side of the part where the operator's cab is provided, and the building is provided at these rear positions, A counterweight is installed at the last position.

  The upper revolving structure of a hydraulic excavator is generally laid out as described above. When maintaining equipment such as an engine installed in a building, supplying fuel to a fuel tank, or operating oil In order to supply hydraulic oil to the tanks, etc., it is necessary for an operator or the like to climb above them. For this purpose, one or more steps are provided on the side of the tank (usually a fuel tank) from the frame of the upper swing body at a position opposite to the operator's cab across the part where the working means is provided. It will go up and down using as a foothold. Moreover, in order to ensure the safety in that case, a handrail is provided along a step. That is the handrail.

  For example, a handrail having a configuration shown in Patent Document 1 is known. According to Patent Document 1, a handrail body made of a pipe material having a circular cross section is fastened to one side of the front side of the fuel tank, and extends straight upward from the fastened position. In this case, the direction is changed so as to be directed downward, and the curved state is extended obliquely forward, and the lowermost end portion thereof is fixed to the frame of the upper swing body.

Here, the fixed end to the fuel tank side of the handrail body is flat and is fixed using bolts. For this purpose, the end portion of the flattened handrail body is sandwiched between a member to which the end is attached and a support plate made of a metal plate, and the bolt is screwed into the support plate. . On the other hand, the end of the handrail body that is fixed to the frame remains cylindrical, and the holding member that has the projecting portions on both sides of the arcuate part is surrounded by a half-divided elastic member. The elastic member is brought into pressure contact with the lower surface of the frame, and the projecting portions at both ends of the holding body are fixed to the frame with bolts.
JP 2002-61231 A

  As described above, when one end portion of the handrail body is fixed to the frame via the elastic member, vibration of the handrail body is suppressed, and damage to the bolt fastening portion of the flat end portion can be prevented. . However, both ends of the handrail body are fixed to the side to be attached using bolts, but when installing the handrail body, it must be in an upright state and fixed by tightening the bolts. Until this is done, the handrail body must be held upright. Therefore, it is extremely difficult, if not impossible, for an operator to perform the installation work alone. For this reason, the handrail mounting work actually requires the intervention of a plurality of workers.

  The present invention has been made in view of the above points, and an object of the present invention is to enable a handrail to be easily attached by a single operator.

  In order to achieve the above-described object, the present invention is a construction comprising a lower structure having traveling means and an upper structure provided at the upper part of the lower structure and provided with at least a cab, working means and a tank. A handrail having a handrail body provided on a machine and having both ends fixed to a high wall surface and a low wall surface of the superstructure, respectively, and one end side attachment portion is provided at an end of the handrail body An end fixing cylinder formed and coupled to at least the one end side mounting portion of the handrail main body in a fitted state is fixed to the wall surface at the height, and the one end side mounting portion and the end portion fixing cylinder are provided. An elastic member that is compressed when the handrail body is rotated by a predetermined angle is interposed between the one end side attachment portion and the end portion fixing cylinder, and the elastic member Compressed state Locking means for preventing rotation and retaining between the handrail body and the end fixing cylinder is provided between the one end side mounting part and the end fixing cylinder, and the handrail body is provided by the locking means. In the state where the rotation is stopped, the other end side is fixed to the low wall surface.

  The handrail body is made of a metal pipe material or rod material, and as its shape, for example, it extends straight from one end side and turns around by bending at a predetermined position so that it becomes a generally arc shape. What was made is used suitably. The handrail main body is attached to a side portion of a construction machine where a step for ascending or descending the upper portion of the construction machine or another member for a foothold is installed. The lower wall surface to which one of the handrail bodies is fixed is usually a superstructure frame, but the higher wall surface differs depending on the construction of the upper structure of the construction machine. For example, a tank (fuel tank or hydraulic oil tank) It becomes the upper surface.

  An end fixed cylinder is fixedly provided on the wall surface at a high place, and the handrail main body is inserted into the end fixed cylinder by a predetermined length including at least one end side mounting portion. As described above, when the handrail body is inserted into the end fixing cylinder, the load of the handrail body is received to some extent by the end fixing cylinder and can be stably held so as not to fall down. From this state, the handrail body is rotated by a predetermined angle around the end fixing cylinder and fixed to the low wall surface. For example, a bolt can be used for fixing to the low wall surface. Thereby, the handrail is attached.

  When the handrail body and the end fixing cylinder are fitted, the handrail body may be the outside and the end fixing cylinder may be the inside, or the handrail body may be the inside and the end fixing cylinder is the outside. It can also be. In any case, the longer the fitting length, the more stable the handrail body can be held by the end fixing cylinder. In the fitting portion, an elastic member is interposed between the one end side attachment portion and the end fixed cylinder, and when the handrail body is rotated, the elastic member is pressed by this turning force. To compress and deform. As a result, the elastic force of the elastic member acts between the handrail body and the end fixed cylinder. Then, the locking means prevents the handrail body from rotating and prevents the handrail body from coming off from the end fixed cylinder. As a result, the handrail body is held in a state of being connected to the end fixed cylinder, and in the meantime, the handrail body is held in an elastically connected state by the elastic member.

  As described above, as an operation for fixing one end side of the handrail body, the handrail body is simply fitted to the end fixing cylinder and rotated by a predetermined angle. Is arbitrary, but the amount of compression of the elastic member changes in accordance with the rotation angle. Therefore, if the rotation angle is too small, the necessary amount of compression may not be obtained, and if the rotation angle is too large, there may be inconveniences, for example, when there are space restrictions. Therefore, the rotation angle is not limited, but is preferably about 90 degrees. Then, after gripping and rotating the portion of the handrail body that is bent in an arc shape, the other end of the handrail body can be fixed to the low wall surface. Thus, by holding the one end side of the handrail body, even if the handrail body is long and heavy, the other end can be easily fixed. Thus, the handrail can be attached smoothly and easily by a single operator.

  The handrail body and the end fixed cylinder are prevented from rotating and coming off by the locking means in a state where the elastic member is compressed. The locking means can be constituted by a projection such as a pin provided on one member and a groove formed on the other side and engaged by the projection. Here, when the handrail body is rotated, the compression direction of the elastic member includes a direction orthogonal to the axial direction of the end fixed cylinder or an upper direction in the axial direction.

  When the compressive force of the elastic member acts in a direction orthogonal to the axial direction of the end fixed cylinder, when the handrail body is rotated, the elastic member is compressed by the displacement in the rotation direction. For this purpose, however, a pressing wall is provided on one of the one end side attachment portion or the end portion fixing cylinder of the handrail body, and the elastic member is pressed against the pressing wall. The elastic member can be fixed to one of the members, but may be in an unfixed state with respect to both members. When the elastic member is compressed, a force in a direction in which the one end side mounting portion provided at the end portion of the handrail body is sandwiched acts. In this case, the groove constituting the locking means can be a bayonet groove. For example, a bayonet groove can be provided in the end fixing cylinder and a protrusion can be provided on the handrail body side, or vice versa.

  The bayonet groove includes an introduction groove for introducing a protrusion, a guide groove for enabling the handrail to rotate, and a lock groove bent at an angle of 90 degrees or more from the end of the guide groove. Constitute. The introduction groove portion and the lock groove portion are oriented in the axial direction of the end fixed cylinder or the handrail body. The guide groove is provided in the circumferential direction. In the locked state, the protrusion and the lock groove are engaged, but the connecting portion itself with the end fixed cylinder is in an elastic connection state by interposing an elastic member, so that the vibration of the superstructure etc. It is possible to effectively buffer and brake the movement of the handrail body caused by this, and the locking means does not have a particularly bad influence on the buffering operation.

  In the case where the elastic member is configured to be compressed in the axial direction of the end fixed cylinder, when the handrail body rotates, the elastic member is moved to move into the end fixed cylinder. There must be. For this purpose, the circumferential groove provided on one of the handrail body or the end fixed cylinder is inclined by a predetermined angle, that is, a cam groove. In order to introduce the protrusion into the cam groove, the start end position of the cam groove is connected to the introduction groove portion, and the end position is connected to the lock groove portion. Since the reaction force in the direction of escaping from the end fixed cylinder acts on the handrail body due to the compression of the elastic member, the reaction member is configured to receive the reaction force of the elastic member by the engagement between the protrusion and the lock groove portion. When the superstructure vibrates, the handrail body mainly moves in the direction of swinging around the end fixed cylinder, so that the elastic member compressed in the axial direction effectively cushions this movement. It can be demonstrated.

  The handrail can be easily attached by a single operator, and the handrail and the member to which the handrail is attached are connected via an elastic member. There is no risk of deformation or damage.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 shows a hydraulic excavator as an example of a construction machine. In the illustrated hydraulic excavator, an upper swing body 4 is turnable via a swing device 3 on a lower travel body 2 having a pair of left and right crawler type travel means 1. Therefore, the lower traveling body 2 has a lower structure, and the upper swing body 4 has an upper structure.

  The upper swing body 4 is provided with a cab 5 on its frame 4 a, and working means 6 for performing work such as excavation of earth and sand is arranged in line with the cab 5. Further, a building 7 containing equipment such as an engine, a hydraulic motor, and a control valve is provided in the rear position of the cab 5, and the side where the working means 6 is mounted is opposite to the cab 5. As shown in FIGS. 2 to 5, a fuel tank 8 and a hydraulic oil tank 9 are installed in this part. The fuel tank 8 is disposed at the front position, and the hydraulic oil tank 9 is disposed at the rear position. A counterweight 10 is installed at the rear position of the frame 5.

  A plurality of steps are provided to rise from the front side of the fuel tank 8 to the upper part thereof. The lowermost step 11a is provided so as to protrude from the frame 4a, the second step 11b is provided on the tool box 12 provided on the frame 4a, and the step 11c is also provided at the side position of the fuel tank 8. Is provided. A handrail 20 is provided for ensuring safety when the worker goes up and down step 11. One end of the handrail 20 is fixed to the upper surface of the fuel tank 8, and the other end has a handrail body 21 formed of a hollow bent pipe fixed to the frame 4 a. Therefore, the handrail 20 includes a handrail body 21 and fixing mechanisms at both ends thereof. The handrail body 21 is composed of a straight portion 21a that is straight from one end side to a midway position, and a curved portion 21b that changes direction from the tip of the straight portion 21a and curves obliquely downward. .

  As shown in FIG. 6, the end portion of the straight portion 21a is inserted into an end portion fixing tube 22 fixed to the pedestal 13 provided on the upper surface of the fuel tank 8, and the handrail body 21 is bent. These ends are bolted to the frame 4a. Here, the pedestal 13 is fixed to the upper surface of the fuel tank 8 by welding means, and the end fixing cylinder 22 is fixed to the pedestal 13 by welding means. Further, the rearview mirror 14 is attached to the curved portion 21 b of the handrail body 21.

  FIG. 7 shows a connection structure between the end fixed cylinder 22 and the straight portion 21 a of the handrail body 21. And as shown in FIG. 8, in this connection part, the edge part of the handrail main body 21 becomes the one end side attaching part 23 in which the cross section became the substantially elliptical shape, and this one end side attaching part 23 is an end. It is inserted into the part fixing cylinder 22 in an embedded state. A ring-shaped elastic member 24 made of rubber or the like is fitted into the one end side mounting portion 23. On the other hand, a pair of pressing walls 25, 25 are provided in parallel inside the end portion fixing cylinder 22. These pressing walls 25 are fixed to the inner surface of the end fixing cylinder 22 or are erected on the pedestal 13.

  In FIG. 8, the distance between the vertices in the major axis direction of the one end side attachment portion 23 is A, the distance between the vertices of the elastic member 24 fitted therein is B, and the distance between the surfaces in the minor axis direction of the elastic member 24 is C. When the distance D between the pressing walls 25 is 25, D> C and A <D <B. Further, the distance B is shorter than the inner diameter of the end fixed cylinder 22. Therefore, when the handrail body 21 is inserted into the end fixing cylinder 22, the long axis of the one end side mounting portion 23 is oriented in a direction substantially parallel to the pressing wall 25 to be inserted between the pressing walls 25, 25. be able to. When the one end side mounting portion 23 is rotated 90 degrees from this state, as shown in FIG. 9, the elastic member 24 fitted in the one end side mounting portion 23 is pressed by the pressing wall 25 and compressed. The space between them is elastically fixed. As a result, when the upper swing body 4 vibrates and the handrail body 21 swings in the direction of the arrow in FIG. 5, a buffering action is performed, and the end fixed cylinder 22 and the pedestal 13 to which it is attached and The wall surface or the like of the fuel tank 8 is not deformed or damaged.

  In order to compress the elastic member 24 within the end fixed cylinder 22, the one end side mounting portion 23 of the handrail body 21 is rotated 90 degrees while being inserted into the end fixed cylinder 22. A bayonet groove 26 is provided in the end fixing cylinder 22 to guide the insertion and rotation of the one end side attachment portion 23 and lock the end portion mounting portion 23 at the end position of the rotation stroke. On the other hand, a protrusion 27 to be inserted into the bayonet groove 26 is provided in the vicinity of the end of the straight portion 21 a of the handrail body 21.

  The bayonet groove 26 has a linear groove portion extending in the axial direction from the upper end portion of the end-fixing cylinder 22 to a predetermined depth position, which is used as an introduction groove portion 26a, and a circle is formed at the end portion of the introduction groove portion 26a. A circumferential groove portion is provided continuously, and this portion serves as a guide groove portion 26b. Further, a groove extends downward in the axial direction at the end of the guide groove 26b, and this portion serves as a lock groove 26c. The lock groove 26c exhibits a function of preventing rotation and slipping out in the end fixed cylinder 22 of the handrail body 21. Further, the protrusion 27 provided on the handrail body 21 is in the shape of a circular rod, and its diameter is slightly smaller than the groove width of the bayonet groove 26, so that the protrusion 27 is smoothly along the guide groove 26. Will slide. Furthermore, when the protrusion 27 is positioned in the guide groove portion 26 b, the lower end portion of the one end side attachment portion 23 is held in a non-contact state with the surface of the base 13. Even when the protrusion 27 enters the groove end portion of the lock groove portion 26c, the lower end portion of the one end side attachment portion 23 is set in contact with the pedestal 13 or in a non-contact state with the pedestal 13.

  Thus, the end fixed cylinder 22 is directional. The upper swing body 4 is fixed to the pedestal 13 such that the pressing wall 25 faces in the front-rear direction indicated by the arrow Y in FIG. 4, that is, in the direction orthogonal to the direction in which the fuel tank 8 and the hydraulic oil tank 9 are arranged. Further, the introduction groove 26a of the bayonet groove 26 provided in the end fixed cylinder 22 is formed of the handrail body 21 and its curved portion 21b is orthogonal to the Y direction as indicated by a virtual line in FIG. When facing in the direction, the protrusion 27 provided on the handrail body 21 is set to a position where it engages. And the guide groove part 26b shall have the length which reaches for the angle of 90 degree | times toward the front in the circumferential direction of the edge part fixed cylinder 22. FIG. Furthermore, the dimension in the depth direction of the end fixed cylinder 22 is stable so that the handrail body 21 does not fall down in a state where the protrusion 27 of the handrail body 21 is inserted to a position where it engages with the guide groove 26b. It is desirable to set the fitting length so as to be held between the straight portion 21a and the end portion fixing cylinder 22 to be secured.

  By configuring as described above, the handrail 20 can be easily and smoothly mounted on the upper swing body 4. First, the handrail body 21 is arranged with its curved portion 21b in the direction indicated by the phantom line in FIG. Then, the protrusion 27 provided on the linear portion 21 a is engaged with the introduction groove portion 26 a in the bayonet groove 26. As a result, the protrusion 27 enters the introduction groove 26a.

  As a result, the weight of the handrail body 21 is supported by the end fixing cylinder 22 and has a predetermined fitting length, so that the handrail body 21 is stably held so as not to fall even if the handrail body 21 is released. The Here, the one end side mounting portion 23 is in the state of FIG. 8 in which the elastic member 24 fitted therein is positioned between the pressing walls 25, 25, and therefore the straight portion 21a has almost no resistance, and the end fixing tube 22 smoothly. Inserted inside.

  From the state described above, the handrail body 21 is rotated 90 degrees around the straight portion 21a with the curved portion 21b facing forward, that is, in the direction of the arrow in FIG. As a result, as shown in FIG. 9, the elastic member 24 is pressed against the pressing walls 25, 25 disposed in the end-fixed cylinder 22, and is compressed between it and the one-end-side mounting portion 23. When the curved portion 21b is located at the end of the rotation stroke facing forward, the long axis of the one-end-side attachment portion 24 is directed in a direction perpendicular to the pressing wall 25, and the elastic member 24 is in the most compressed state. At this time, the protrusion 27 moves along the guide groove portion 26b, but the guide groove portion 26b extends only to the above-described rotation stroke end position.

  A lock groove portion 26c directed downward is continuously provided at the rotation stroke end position of the handrail body 21 guided by the guide groove portion 26b. Accordingly, the protrusion 27 moves to the lock groove portion 26c. Therefore, the handrail body 21 is further pushed in the direction of entering the lock groove 26c. Thereby, the end portion of the straight portion 21a of the handrail body 21 is fixedly held. From this state, the end portion of the bending portion 21b is brought into contact with the front surface portion of the frame 4a, and is fixed to a predetermined position by means such as bolting.

  As a result, the lock groove portion 26c of the bayonet groove 26 and the protrusion 27 are engaged, and the straight portion 21a of the handrail body 21 is in the rotational direction and in the direction of being inserted into and removed from the end portion fixing cylinder 22. Will also be securely fixed. The above operations can be performed by a single operator, and can be performed easily and smoothly without the assistance of another person. In this way, in the upper swing body 4, the handrail 20 is mounted along the steps 11a to 11c, and safety when the worker ascends and descends is ensured.

  During operation of the hydraulic excavator, the upper swing body 4 vibrates. Since the handrail 20 protrudes largely upward from the fixed portions at both ends thereof, this vibration is transmitted to the handrail body 21 and swings greatly to the left and right as indicated by arrows in FIG. It also vibrates up and down. However, the end portion of the straight portion 21a of the handrail body 21 is elastically connected via the compressed elastic member 24 to the end portion fixing cylinder 22 mounted on the upper surface of the fuel tank 8, and this elastic member. Since the buffering action is exhibited by 24, there is no possibility that the end fixed cylinder 22, the handrail body 21, and the protrusion 27 provided thereon are deformed or damaged by the swinging or vibration of the handrail body 21.

  The configurations of the one end side mounting portion and the elastic member provided on the handrail body and the configuration of the end fixing cylinder and the pressing wall are not limited to those described above, and various configurations can be considered as exemplified below. .

  For example, there are those shown in FIGS. In this modification, a pair of pressing walls 25A are fixedly provided on the inner surface of the end fixed cylinder 22A, and the elastic member 24A is configured to be fitted in the end fixed cylinder 22A. When the one end side mounting portion 23A is in a state parallel to the pressing wall 25A, as shown in FIG. 10, the one end side mounting portion 23A is kept in a non-contact state with the elastic member 24A, and the handrail body is When rotated 90 degrees to the state shown in FIG. 11, the elastic member 24A may be compressed at both ends in the major axis direction of the one end side mounting portion 23A.

  The elastic member 24B shown in FIGS. 12 and 13 is formed in a frame shape having a substantially square cross section, and the one end side mounting portion 23B has a dimension slightly shorter than the inner edge portion of the elastic member 24B. It consists of what has a square cross section. Then, the end fixed cylinder 22B is provided with pressing walls 25B at the four locations so as to be in contact with the outer edge of the elastic member 24B. In the case of such a configuration, when the one-end-side mounting portion 23B is inserted into the elastic member 24B from the state of FIG. 12 and rotated as shown in FIG. 24B is compressed. Here, in this case, the rotation angle of the handrail body is 45 degrees.

  Furthermore, as shown in FIGS. 14 and 15, the elastic member 24C may be divided into two. In this case, the pressing walls 25C and 25C are provided on the inner surface of the end fixed cylinder 22C, and both the pressing walls 25C abut both elastic members 24C at the front position in the rotation direction of the one end side mounting portion 23C. Arrange. Accordingly, when the one end side mounting portion 23C is inserted between the elastic members 24C and 24C from the state of FIG. 14 and the handrail is rotated, the elastic member 24C is moved along with the rotation of the one end side mounting portion 23C. The rotation is restricted by the pressing wall 25C, and as shown in FIG. 15, the elastic member 24C is compressed at the distal end portion on the long axis side of the one end side attachment portion 23C.

  Further, as shown in FIG. 16, the pressing wall 25D can be formed by forming a throttle part having an inner surface in a flat state at the lower part of the end fixing cylinder 22D.

  17 and 18 show a second embodiment of the present invention. As is clear from these drawings, a circular elastic member 124 having a predetermined thickness is fixedly provided inside the end fixing cylinder 122. Further, the protrusion 127 is provided so as to protrude inward from the inner surface of the end fixing cylinder 122. And the one end side attaching part 123 is extended in the edge part of the linear part 121a of the handrail main body 121, and this one end side attaching part 123 is comprised from the cylindrical shape. The outer diameter of the straight portion 121 a of the handrail body 121 is slightly shorter than the inner diameter of the end-fixing cylinder 122, but the outer diameter of the one end side mounting portion 123 is further greater than the outer diameter of the handrail body 121. The tip end portion of the one end side attachment portion 123 functions as a pressing portion that compresses the elastic member 124, and the pressing wall against which the elastic member 124 is pressed becomes a base 113.

  And the guide groove 126 in which the protrusion 127 is guided is formed in the cylindrical one-end-side mounting portion 123. The guide groove 126 with which the protrusion 127 engages is composed of an introduction groove 126a for introducing the protrusion 127 of the one end side attachment portion 123, a cam groove 126b, and a lock groove 126c. The cam groove portion 126b has a predetermined angle in the circumferential direction, and further extends from the connecting portion with the introduction groove portion 126a to the connecting portion to the lock groove portion 126c. Extending obliquely upward. And after moving to the lock groove part 126c from the edge part of the cam groove part 126b, it is extended toward the downward direction.

  With this configuration, when the one end side attachment portion 123 provided continuously with the straight portion 121 a of the handrail main body 121 is inserted into the end portion fixing cylinder 122, the protrusion 127 first introduces the guide groove 126. Guided into the groove 126a. Then, when the projection 127 moves from the end of the introduction groove 126a to the guide groove 126b, the linear portion 121a of the handrail body 121 is operated to rotate about the axis, whereby the projection 127 becomes the cam groove 126b. Will move along. Since the guide groove portion 126b extends obliquely upward, the one end side attachment portion 123 is pushed downward by the rotation of the one end side attachment portion 123. At this time, the elastic member 124 becomes the base. It is pressed by 113 and compressed. When the protrusion 127 moves from the guide groove portion 126b to the lock groove portion 126c, a force in a direction of pushing up the one end side attachment portion 123 acts by the elastic force of the elastic member 124 as shown in FIG. However, the protrusion 127 contacts the end of the lock groove 126c, and the elastic member 124 is not pushed up any further. As a result, as in the first embodiment described above, the end portion of the handrail body 121 on the linear portion 121a side is elastically fixed.

  Here, in order to increase the pressing area against the elastic member, the outer surface continuously reduced in diameter toward the distal end has a frustoconical shape like the one end side attachment portion 123 ′ shown in FIGS. You can also The elastic member 124 ′ may have a circular portion with a predetermined size at the center, and a member whose outer peripheral portion expands in a tapered shape may be mounted in the end fixed cylinder 122. As a result, as shown in FIG. 20, when the elastic member 124 'is pressed, the pressing area to the elastic member 124' by the one end side attachment portion 123 'is increased, and the stability of the handrail in the mounted state is further improved. To do.

  Further, as shown in FIGS. 21 and 22, the one end side attachment portion 223 provided to be connected to the straight portion 221 a of the handrail body 221 has a cylindrical shape, and a disk-like shape having a predetermined thickness therein. The elastic member 224 may be attached. Then, the retainer ring 200 is fixed to the inner surface of the one end side mounting portion 223 to hold the elastic member 224 so as not to fall. On the other hand, the end fixed cylinder 222 includes a fixed cylinder main body 222a that is inserted into one end side mounting portion 223 made of a cylindrical member, and a pushing portion 222b provided at the upper end of the fixed cylinder main body 222a. . The protrusion 227 is provided on the fixed cylinder main body 222 a of the end fixed cylinder 222, and the guide groove 226 including the introduction groove 226 a, the cam groove 226 b, and the lock groove 226 c is formed in the one-end-side attachment portion 223. The one end side attachment portion 223 is formed of a covered cylinder, and the top plate portion to which the tip of the straight portion 221a of the handrail body 221 is fixed by means such as welding is pressed against the elastic member 224. It becomes.

  Even with this configuration, the handrail main body 221 can be fixed in a connected state simply by being fitted to the end fixing cylinder 222 of the one end side mounting portion 223, as described above, and both are elastic. It will be connected to. And even if a pollutant such as rainwater enters the pedestal part, the elastic member 224 is separated from the pedestal, so that the elastic member 224 can be minimized.

1 is an overall configuration diagram of a hydraulic excavator as an example of a construction machine to which a handrail of the present invention is attached. It is an external view which shows the mounting part of the handrail in the hydraulic shovel which shows the 1st Embodiment of this invention. FIG. 3 is a side view of FIG. 2. FIG. 3 is a plan view of FIG. 2. FIG. 3 is a front view of FIG. 2. It is an external view which isolate | separates and shows a handrail main body and an edge part fixed cylinder. It is sectional drawing of the state after connecting a handrail main body and an edge part fixed cylinder, and rotating. It is sectional drawing in the XX position of FIG. 7 which shows the state before rotation of a one end side attaching part. It is XX sectional drawing of FIG. 7 which shows the state after the rotation of the one end side attaching part. It is sectional drawing similar to FIG. 7 which shows the 1st modification in the 1st Embodiment of this invention. It is sectional drawing similar to FIG. 8 which shows the 1st modification in the 1st Embodiment of this invention. It is sectional drawing similar to FIG. 7 which shows the 2nd modification in the 1st Embodiment of this invention. It is sectional drawing similar to FIG. 8 which shows the 2nd modification in the 1st Embodiment of this invention. It is sectional drawing similar to FIG. 7 which shows the 3rd modification in the 1st Embodiment of this invention. It is sectional drawing similar to FIG. 8 which shows the 3rd modification in the 1st Embodiment of this invention. It is sectional drawing which shows another modification of an edge part fixed cylinder. It is an external view which isolate | separates and shows the handrail main body and end part fixed cylinder which show the 2nd Embodiment of this invention. It is sectional drawing of the state which connected the handrail main body and end part fixing cylinder which show the 2nd Embodiment of this invention. It is an external view which isolate | separates and shows the handrail main body and end part fixing cylinder which show the 1st modification of the 2nd Embodiment of this invention. It is sectional drawing of the state which connected the handrail main body and end part fixed cylinder which show the 1st modification of the 2nd Embodiment of this invention. It is an external view which isolate | separates and shows the handrail main body and end part fixing cylinder which show the 2nd modification of the 2nd Embodiment of this invention. It is sectional drawing of the state which connected the handrail main body and end part fixed cylinder which show the 2nd modification of the 2nd Embodiment of this invention.

Explanation of symbols

2 Lower traveling body 4 Upper revolving body 4a Frame 8 Fuel tanks 11a to 11c Step 13 Base 20 Handrail 21, 121, 221 Handrail body 21a, 121a, 221a Straight part 21b Curved part 22, 22A to 22D, 122, 222 End Part fixing cylinders 23, 23A to 23C, 123, 223 One end side mounting parts 24, 24A to 24C, 124, 224 Elastic members 25, 25A to 25D, 125, 225 Pressing wall 26 Bionet groove 126 Guide grooves 26a, 126a, 226a Guide groove 26b Guide groove 126b, 226b Cam groove 26c, 126c, 226c Lock groove 27, 127, 227 Projection

Claims (6)

Provided in a construction machine comprising a lower structure having traveling means and an upper structure connected to the upper part of the lower structure, and at least an cab, work means, and an upper structure provided with a tank. In a handrail having a handrail body fixed to a wall surface and a low wall surface,
One end side mounting portion is formed at the end of the handrail body,
An end fixing cylinder connected to a fitting state with at least the one end side mounting portion of the handrail body is provided fixed to the wall surface of the high place,
When the one end side mounting portion and the end portion fixing cylinder are fitted between the one end side mounting portion and the end portion fixing cylinder, and the handrail body is rotated by a predetermined angle. Interposing an elastic member to be compressed,
Provided between the one end side mounting portion and the end portion fixing cylinder locking means for preventing rotation and slipping between the handrail body and the end portion fixing cylinder in a state where the elastic member is compressed,
The handrail of a construction machine is characterized in that the other end side is fixed to the low wall surface while the handrail body is rotationally stopped by the locking means. 2. The handrail for a construction machine according to claim 1, wherein the high wall surface is an upper surface of the tank, and the low wall surface is a frame of the superstructure. One of the end-fixing cylinder and the one end-side mounting portion is configured with a circular cross section, and the other is configured with a non-circular cross section, and the circular member has a pressing wall against which the elastic member is pressed. When the handrail body is rotated, the elastic member is compressed between the non-circular member and the pressing wall, and at the position of the rotation stroke end of the handrail body. The elastic member is held in a compressed state, and the locking means is provided between the one end side mounting portion and the end portion fixing cylinder, one being a bayonet groove and the other being along the bayonet groove. The construction machine handrail according to claim 1, wherein the handrail includes a protrusion that slides and displaces. The protrusion is provided in the handrail body, and the bayonet groove is provided in the end fixing tube, and an introduction groove extending in a predetermined length axial direction from an upper end surface portion of the end fixing tube; The guide groove portion is connected to the end portion of the introduction groove portion and extends in the circumferential direction. The guide groove portion corresponds to the rotation angle of the handrail body, and the end portion of the guide groove portion is orthogonal to the guide groove portion. The construction machine handrail according to claim 3, wherein the handrail comprises a formed locking groove. The one end side mounting portion is flat or square, and the pressing wall is provided inside the end fixing cylinder, and the elastic member is either the one end side mounting portion or the pressing wall. The construction machine handrail according to claim 3, wherein the handrail is provided so as to abut against the construction machine. When the end fixing cylinder and the one end side mounting portion of the handrail body are both made of a member having a circular cross section, and when the one end side mounting section is fitted to the end fixing cylinder, the end fixing cylinder is rotated. Then, the one end side mounting portion is displaced in a direction to enter the end portion fixing cylinder, and the elastic member is compressed and deformed to relatively move between the one end side mounting portion and the end portion fixing cylinder. For this purpose, a protrusion is provided on one side, and a guide groove is formed on the other side to slide and displace the protrusion. The guide groove is connected to the introduction groove part for introducing the protrusion and the introduction groove part. The cam groove is formed in a circumferential direction and is inclined at a predetermined angle, and a lock groove connected to the groove end of the cam groove, and by engaging the lock groove with the protrusion, The handrail body and the end Claim 1 or claim 2 construction machine handrail according is characterized in that a configuration in which said locking means for rotation stopper and stopper between cylinder.

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