JP5059488B2 - Safety belt locking device for aerial work platforms - Google Patents

Description

  The present invention relates to a safety band locking device that locks a safety band locking tool attached to a worker's body so that an operator who is on a work platform of an aerial work vehicle can safely perform work at a high place. .

  An aerial work platform is provided with a work table on a vehicle body via a lifting device (for example, a boom device), and the lifting device is operated to move the work table to a desired position and board the work table. It is possible to work at a high place by a worker who has done so. When performing an aerial work using such an aerial work vehicle, the worker moores the body on the work table using a body holding device called a so-called safety belt. This safety belt is composed of a belt wound around the body of the worker and a rope having one end connected to the belt and a hook (locking tool) provided at the other end. The operator can safely work at a high place by engaging the hook with a latch provided on the work table.

With the safety belt having such a configuration, the original purpose of the safety belt cannot be achieved if the operator forgets to hook the hook on the latch. Therefore, a safety band detection device for detecting the hook engagement state is provided on the work table. When the hook engagement state is not detected without locking the hook to the safety belt detection device, the lifting device is As a configuration in which the operation of the aerial work vehicle engine cannot be started or a configuration in which the engine of the aerial work vehicle cannot be started, a means that can surely prompt the hook to be locked has been proposed (for example, see Patent Document 1). .
JP 2002-60197 A

  The operator's boarding work bench and safety ropes are made of an insulating material to insulate electrical continuity, but the hooks and hooks are made of metal, If the hook is locked to the latching metal in the state exposed at, there is a risk of electric shock when the operator accidentally touches the hook. Further, in order to prevent the hook locked state from being exposed, if an insulating cover is attached so as to cover the hook in the locked state, the workability of hook engagement / disengagement is deteriorated, and the opening / closing space of the cover is also reduced. There was a problem of becoming necessary.

  In view of the problems as described above, according to the present invention, an operator who has boarded a work table can easily engage and disengage the locking device of the safety belt and prevent the locking device in the locked state from being exposed. It is an object of the present invention to provide a safety belt locking device for an aerial work vehicle capable of performing the above.

In order to solve the above problems, a safety band locking device for an aerial worker according to the present invention is used for an aerial work vehicle in which a work table is provided on a vehicle body via an elevating device (for example, a boom 30 in the embodiment). A belt member wound around the worker's body, a hook and an engaging tool (for example, hook 93 in the embodiment) provided with an opening / closing cap that opens and closes the mouth of the hook, and the belt member. A safety belt for an aerial work vehicle provided on a workbench for detachably locking a safety belt locking tool formed by a rope-shaped member (for example, the rope 92 in the embodiment) that connects the tools. A locking device, which is provided on a workbench and has a latching means capable of engaging and disengaging the hook part of the latching tool and a notch hole through which the latching tool can be inserted so as to cover the latching means. is composed of a cover member attached to the workbench, notch hole is safety belt An engagement / disengagement position in which the open / close cap is positioned outward of the cover member in a state in which the hook portion is inserted into the cover member through the cutout hole in order to engage / disengage the engagement member with the engagement means; It is formed so as to be movable between at least the collar portion and the opening / closing cap of the locking tool and the work position covered by the cover member while being locked by the locking means .

  In the safety belt locking device for an aerial work vehicle, the locking device is provided on the locking means, the locking device is locked to the locking device, and the locking device detects that the locking device is located at the working position. When it is detected by the detection means (for example, the photoelectric sensor 70 in the embodiment) and the locking detection means that the locking tool is locked to the locking means and located at the work position, the lifting device is operated. It is preferable to be configured to include control means for permitting (for example, the controller 72 in the embodiment).

  Further, the latching means is provided in a bracket (for example, the hook bracket 51 in the embodiment) having an opening in which the locking tool can be loosely inserted, and disposed in the opening of the bracket. A latch member that can latch the latch and a stopper member that restricts the latch from moving from the work position when the latch is positioned at the work position (for example, the leaf spring 60 in the embodiment). And a regulating member 61).

The stopper member includes a swinging biasing member (for example, a leaf spring 60 in the embodiment) having the other end attached to the outer side of the bracket so that one end protrudes from the outer side of the bracket, and the opening of the bracket. A stopper member that is attached to one end of the swinging biasing member so as to cover the portion and swings so as to open and close the opening by the biasing force of the swinging biasing member. It is preferable that the locking tool is configured to be freely inserted into and exited from the opening.

Further, the notch hole of the cover member is formed to be narrower than the locking tool, and at least the outer peripheral edge of the notch hole is formed of an elastic member. Therefore, the notch hole is expanded and engaged by elastic deformation of the elastic member. It is preferable that the stopper can be inserted.

  According to the safety belt locking device for an aerial work vehicle according to the present invention, the cover member does not cover and expose the locking device of the safety belt that is locked to the hooking means. It is possible to prevent contact with obstacles such as electric poles and electric poles, and it is possible to prevent an electric shock of an operator. In addition, it is possible to prevent the locking tool from being easily unlocked by the latching means (preventing unsafe work) without interfering with the worker, and the state where the locking tool is attached / detached from the ground. It can be visually recognized. Further, since the lifting device cannot be operated unless the latching means is locked to the working position after the latching means is locked, the safety belt locking tool can be reliably locked to the latching means. . At the start of work, the locking member can be easily engaged and disengaged through the notch hole of the cover member, so that the workability is not impaired, and it is necessary to open and close the cover member in order to lock the locking member to the latching means. Therefore, it is not necessary to provide an opening / closing space for the cover member. Furthermore, since there is a stopper member even if it receives vibration from the outside, the locking tool in the locked state does not swing unnecessarily.

  Further, when the stopper member is constituted by a swinging biasing member and a restricting member, the restricting member is swung to one side so that the engaging member can be freely inserted into and removed from the hook bracket opening when the engaging member is engaged and disengaged. Since the restricting member is swung to the other position so that it returns to the position where the lock is restricted by the urging force of the swing urging member after the locking tool enters and exits the opening, the stopper member is locked. There is no hindrance to disengagement.

  Further, when the outer peripheral edge portion of the cover member is formed of an elastic member, even if the cutout hole is provided small with respect to the locking tool, the cutout hole expands freely due to elastic deformation of the elastic member. The tool can be inserted through the notch hole, and the safety can be further improved by minimizing the opening on the surface of the cover member.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows an aerial work vehicle 1 equipped with a safety belt locking device according to an embodiment of the present invention. Before describing the safety belt locking device according to the present invention, the configuration of the aerial work vehicle 1 will be described first.

  As shown in FIG. 2, the aerial work vehicle 1 is provided on the traveling body 10 with a truck-type traveling body 10 that includes traveling wheels 11,. A swivel base 20, a boom (extensible boom) 30 having a base end supported on a top of a support column 21 extending upward from the swivel base 20 via a foot pin 22, and a boom 30 attached to the distal end portion thereof And a work table 40 for boarding an operator.

  The swivel base 20 is attached to the rear part of the traveling body 10 so as to be rotatable 360 degrees around the vertical axis. A turning motor (hydraulic motor) 23 is provided inside the traveling body 10, and by rotating the turning motor 23, the turntable 20 can be horizontally turned through a gear (not shown).

  The boom 30 includes a base boom 30a, an intermediate boom 30b, and a distal boom 30c that are nested. The boom 30a, 30b, and 30c are relatively moved by the expansion and contraction operation of an expansion / contraction cylinder (hydraulic cylinder) 31 provided therein. The boom 30 can be extended and contracted in the axial direction. Further, a hoisting cylinder (hydraulic cylinder) 24 is straddled between the base end boom 30a and the support column 21 of the swivel base 20. By operating the hoisting cylinder 24 to extend and contract, the entire boom 30 is moved within the upper and lower surfaces. Can be undulated.

  A boom head 32 is attached to the distal end portion of the distal end boom 30c, and the lower end portion of the vertical post 33 is pivotally supported by the boom head 32. The vertical post 33 is configured so that a vertical posture is always maintained by a leveling device (not shown) provided in the boom 30 regardless of the undulation angle of the boom 30.

  The work table 40 is formed in a box shape by FRP, and is rotatably attached to the upper end portion of the vertical post 33 via a work table holding bracket 41 that protrudes to the outside. A swing motor (hydraulic motor) 42 is provided inside the work table holding bracket 41, and by swinging the swing motor 42, the work table 40 is swung around the vertical post 33 (horizontal). Swivel motion). Here, since the vertical post 33 is always maintained in the vertical posture as described above, as a result, the floor surface of the work table 40 is always held horizontally regardless of the undulation angle of the boom 30. Further, FRP is a well-known material, and is an electrically insulating material in which glass fiber or carbon fiber for reinforcement is mixed in a synthetic resin.

  As shown in FIG. 3, the work table 40 is provided with an operation device 48, and an operator OP who has boarded the work table 40 operates levers from the operation device 48, so that the hoisting cylinder 24, Operation inputs of the telescopic cylinder 31, the turning motor 23, and the swing motor 42 can be performed. An operation input signal output by operating the levers is input to a controller 72 provided above the swivel base 20 via a signal transmission line (not shown) passing through the boom 30, and valve drive control by the controller 72 is performed. The hoisting cylinder 24, the telescopic cylinder 31, the turning motor 23, and the swing motor 42 are hydraulically driven through these.

  For this reason, the operator OP can perform the raising / lowering, extending / contracting, turning operation of the boom 30 and the swinging operation of the work table 40 by operating the lever from the work table 40, and moves to a desired position by his / her own intention. Work is possible. As shown in FIG. 2, there are provided jacks 15 that can lift and support the vehicle body 10 at four positions in the front, rear, left, and right of the traveling body 10, and project them downward to stably support the vehicle body 10. Even when the overturning moment acting on the vehicle body 10 is large, the work can be performed without overturning.

In order to prevent the operator OP who has boarded the work table 40 from falling down, as shown in FIG.
It is necessary to wear. The safety belt 90 includes a belt 91 attached to the operator OP, a rope 92 attached at one end to the belt 91, and a hook 93 attached to the other end of the rope 92. The hook 93 has a flange portion 93a at the tip, an opening / closing cap 93b for closing the flange portion 93a, and a safety cap 93c for controlling the rotation thereof. When the hook 93 is locked, by holding the open / close cap 93b and the safety cap 93c at the same time with the palm, the collar portion 93a is opened and can be locked. When the locking is completed, by releasing the palm, both the opening and closing cap 93b and the safety cap 93c are returned to the normal position where the flange portion 93a is closed by the elasticity of a spring (not shown).

  When the operator OP gets on the work table 40, the hook 93 is always hooked and locked on a hook member 55 that forms a part of a safety band locking device 50 described later provided on the work table 40. It has been demanded. As a result, even if the operator OP falls from the work table 40 during the work, the worker OP does not fall to the ground and the work safety is ensured. Here, the hook 93 is preferably made of metal in consideration of strength, wear, and the like, and the rope 92 is preferably made of an electrically insulating material in order to prevent electric shock of the operator OP.

  Next, the safety belt locking device provided in the aerial work vehicle 1 will be described. As shown in FIG. 1, the safety belt locking device 50 provided in the aerial work vehicle 1 includes a hook bracket 51, a latch member 55, and a pair of left and right plates disposed on a worktable bracket 43 of the worktable 40. A spring 60, a pair of left and right regulating members 61, a photoelectric sensor 70, and a cover member 80 are included. Here, FIG. 1 shows that even when a plurality of (two) workers are on board, each worker OP can lock the hook 93 of the safety belt 90 attached to the body to the safety belt locking device 50. For convenience of explanation, FIG. 1 shows a state in which a cover member 80 is attached on the left side, and a cover member 80 on the right side. The state before attaching is shown.

  As shown in FIGS. 1 and 4, the hook bracket 51 is formed in a substantially U shape by welding a flat steel plate to one end of a steel plate bent in an L shape. It is formed with an opening 51a into which the hook 93 of the safety belt 90 wound around can be freely inserted. On both sides of the hook bracket 51, a through hole through which the latch member 55 can be inserted, a screw hole for attaching the leaf spring 60 with a bolt 75, and a slit hole through which light emitted from the photoelectric sensor 70 passes. 54 is provided. The hook bracket 51 is not limited to this structure, and may be formed in a substantially U shape by bending a single steel plate.

  The hook member 55 is formed in a rod shape so that the hook 93 of the safety belt 90 can be engaged and disengaged. The hook member 51 is inserted into through holes formed on both sides of the hook bracket 51 and welded. Is fixed.

  The leaf spring 60 is elastically deformable, one end 60 a is attached to the outer side of the hook bracket 55 by a bolt 75, and a regulating member 61 is attached to the other end 60 b by a bolt 76. The leaf spring 60 is attached by a bolt 75 so that the other end portion 60b protrudes from the outer portion of the hook bracket 51 and the one end portion 60b is abutted and supported by the outer portion of the hook bracket 51. With respect to the elastic force generated in the spring 60, the other end 60 b can swing left and right with respect to the outer side of the hook bracket 51 with the one end 60 a as the center.

  The restricting member 61 is bent in a substantially L shape in a plan view, and a through hole into which the bolt 76 can be inserted and a counterbore hole in which the head of the bolt 76 is accommodated are formed in one portion 61a. 76 is screwed with a nut 79 outside the one portion 61a, and is connected so that the one portion 61a contacts the leaf spring 60. The other portion 61b of the pair of left and right regulating members 61 faces each other on the front surface of the opening 51a of the hook bracket 51, and the gap between the pair of left and right other portions 61b is smaller than the hook 93 of the safety belt 90. (In the following description, this position is referred to as “restricted position”). Further, the gap between the other portions 61 b can be expanded by swinging the pair of left and right restricting members 61 outward by elastic deformation of the leaf spring 60. Even if it is provided with a smaller width, the regulating member 61 can swing to a position where the hook 93 can pass (in the following description, this position is referred to as a “swing position”). Further, the inner corner portion of the other portion 61b is R-chamfered so that the hook 93 of the safety belt 90 can be passed between the pair of left and right other portions 61b without difficulty.

  The photoelectric sensor 70 includes a projector 70 a and a light receiver 70 b, and both sides of the hook bracket 51 so that the optical axis between the projector 70 a and the light receiver 70 b passes between the pair of slit holes 54 of the hook bracket 51. It is attached to the part via a sensor mounting bracket 71. For this reason, light (signal light) from the projector 70 a is irradiated toward the light receiver 70 b through the pair of slit holes 54 provided in the hook bracket 51. In general, in the photoelectric sensor 70, when an object that blocks the signal light emitted from the projector 70a enters between the pair of slit holes 54, the light receiver 70b detects that the signal light is blocked, and an ON signal is output. When the signal light is not blocked and is received by the light receiver 70b, an off signal is output.

  When the hook 93 is not locked to the hooking member 55, the signal light emitted from the light projector 70a of the photoelectric sensor 70 is received by the light receiver 70b without being blocked by the hook 93, and the hook is not locked. When it is detected, an off signal is output to the controller 72 provided in the vehicle body 10. When the controller 72 inputs this off signal, the valve drive control by the controller 72 is restricted, and the boom 30 cannot be turned, undulated, extended or contracted.

  When the hook 93 is locked to the hooking member 55 and is in the opening 51a of the hook bracket 51, the hook 93 blocks the signal light emitted from the light projector 70a, so that the light receiver 70b blocks the signal light. This is detected (the hook engagement state is detected), and an ON signal is output to the controller 72 provided in the vehicle body 10. When the controller 72 inputs this ON signal, the restriction of the valve drive control by the controller 72 is released, and the boom 30 can turn, undulate, extend and retract.

  As shown in FIG. 1, the cover member 80 is formed of a cover body member 81 and a rubber cover member 85, and covers the hook bracket 51 so as to cover the first front portion 81 a of the cover body member 81. The bolt 77 is inserted into the formed insertion hole and screwed into the screw hole of the stay 47 of the worktable bracket 43 so as to be detachably attached to the worktable bracket 43.

The cover body member 81 is formed of FRP, and includes a first front surface portion 81a, a first upper surface portion 81b formed by bending the upper surface of the first front surface portion 81a so as to cover the upper surface of the hook bracket 51, and a first surface portion 81b. It is comprised from a pair of 1st side part 81c bent from the right-and-left end of the front part 81a, and the recessed part 81d formed so that it might become depressed in the upper center of the 1st front part 81a.
Further, the cover body member 81 is provided with an engagement hole for mounting the rubber cover member 85 so as to extend upward from the recess 81d and bend to the first upper surface portion 81b. A rubber cover member 85 can be fitted into and attached.

  The rubber cover member 85 is formed of rubber made of an elastically deformable material, and is installed in the engagement hole of the cover main body member 81 as described above so as to cover the front surface and the upper surface of the hook bracket 51. It is mounted in the engagement hole of the member 81. The rubber cover member 85 includes a second front surface portion 85a positioned at the center of the upper end portion of the first front surface portion 81a in the engagement hole of the cover body member 81, and a second upper surface formed by bending from the upper end of the second front surface portion 85a. It is comprised from the part 85b and the taper part 85c bent from the lower end of the 2nd front part 85a.

  Further, the rubber cover member 85 is provided with a notch hole 87 formed along the longitudinal central axis so that the notch hole 87 can be expanded by elastic deformation of the rubber cover member 85, and the notch hole 87 is formed in the tapered portion 85c. The slot-shaped first cutout hole 87a and the second cutout hole 87b extending upward from the center of the upper end of the first cutout hole 87 and bending into the second upper surface portion 85b. The second cutout hole 87b is formed to be small with respect to the hook 93 in order to reduce the opening on the surface of the cover member 80. However, the first cutout hole 87a has a locking position when the hook 93 is engaged and disengaged. It is formed large with respect to the hook 93 for easy confirmation.

  Further, by forming a pair of auxiliary notch holes 88 that are perpendicular to the second notch hole 87b in parallel on the second upper surface portion 85b, the auxiliary notch holes 88 are expanded from the second notch hole 87b. Even when the hook 93 of the safety belt 90 is locked in the cover member 80, the rope 92 attached to one end of the hook 93 and extending upward can be formed in the second cutout hole 87b. Can be inserted.

  The safety band locking device 50 according to an embodiment of the present invention is configured as described above, and the mode of use will be described next.

  Before the operator OP who has boarded the work table 40 starts working, first, the belt 91 of the safety belt 90 is wound around his / her body, and the hook 93 is locked to the safety belt locking device 50 as shown in FIG. As shown in A), the hook 93 is inserted into the first cutout hole 87a of the rubber cover member 85 from the flange portion 93a side, and the hook portion 93a is opened by simultaneously grasping the opening and closing cap 93b and the safety cap 93c. Let Then, as shown in FIG. 5B, the hook 93 is locked to the latching member 55 fixed to the hook bracket 51 (in the following description, this position is referred to as “engagement / disengagement position P1”). At this time, since the first cutout hole 87a is formed larger than the hook 93 so as not to interfere with the engagement / disengagement work of the hook 93 as described above, the operator OP can easily hook up from the first cutout hole 87a. The position of the stop member 55 can be confirmed and locked.

  Next, as shown in FIG. 5C, the hook 93 is swung upwardly around the engaging portion of the latching member 55, and the hook 93 is moved from the opening / closing cap 93b side to the second of the rubber cover member 85. It is inserted through the notch hole 87b. At this time, since the second cutout hole 87b is expanded by elastic deformation of the rubber cover member 85 pressed from the hook 93, the hook 93 can be easily inserted.

  When the hook 93 is swung upward, the hook 93 enters the gap between the pair of left and right restricting members 61 and presses the pair of restricting members 61 at the restricting position outward. At this time, the leaf spring 60 attached to the restricting member 60 is elastically deformed, so that the restricting members 61 are respectively swung outward and a gap between the restricting members 61 is widened. Since the restricting member 61 is swung to the swing position, the hook 93 can pass between the restricting members 61. In addition, the regulating member 61 that is swung outward is swung inward by the urging force (in other words, restoring force) of the leaf spring 60 and returned to the original restriction position.

  As shown in FIG. 5 (D), when the hook 93 passes between the regulating members 61 and enters the opening 51 a of the hook bracket 51, the rope 92 attached to one end of the hook 93 is connected to the rubber cover member 85. 2 will reach the second cutout hole 87b in the upper surface portion 85b (in the following description, this position is referred to as “working position P2”). At this time, since the second cutout hole 87b is pressed from the rope 92 and the second cutout hole 87b is expanded so as to be pushed along the auxiliary cutout hole 88, the rope 92 can be easily inserted. it can.

  Further, when the hook 93 is locked to the hooking member 55 and accommodated in the opening 51a of the hook bracket 51, the restricting member 61 returned to the restricting position by the urging force of the leaf spring 60 causes the hook 93 to open to the opening 51a. The movement of the hook 93 is restricted so as to keep it inside. Further, in the photoelectric sensors 70 provided on both sides of the hook bracket 51, when the signal light emitted from the projector 70a is blocked by the hook 93, the light receiver 70b detects that the hook 93 is at the work position P2. Output an ON signal. Then, the restriction of the valve drive control by the controller 72 is released by this ON signal, so that the boom 30 can be turned, undulated, extended and contracted, and the operator OP can perform work at a high place.

  In this way, the metal hook 93 can be locked to the hooking member 55 without being exposed, and can be accommodated in the cover member 80, so that an operator may accidentally touch the hook 93 to get an electric shock. Is prevented. Even if the cutout hole 88 for inserting the hook 93 into the cover member 80 is formed small with respect to the hook 93, the hook 93 can be inserted so that it can be expanded by elastic deformation of the rubber cover member 85. The opening of the cover member 80 can be made small and safety can be ensured without impairing the workability of engaging and disengaging the hook 93. Further, even if the hook 93 is swung due to vibrations or the like from outside during work, the hook 93 can be held in the opening 51 a of the hook bracket 51 because the restricting member 61 is in the restricting position. The restricting member 61 is formed in a substantially L shape in a plan view, but is not limited thereto, and may be formed in a substantially triangular shape in a plan view.

  On the other hand, when the hook 93 is unlocked, the hook 93 at the work position P2 is pressed so that the restricting member 61 swings outward from the opening 51a of the hook bracket 51. The gap between the restricting members 61 is passed. Next, the upper side of the hook 93 that has come out of the opening 51 a of the hook bracket 51 is passed through the second notch hole 87 b so as to be swung downward and taken out of the cover member 80. Then, in the hook 93 at the engagement / disengagement position P1, the opening / closing cap 93b and the safety cap 93c are grasped so as to be pushed in at the same time, and the hook 93 and the hooking member 55 are unlocked, thereby removing the hook 93 from the first cutout hole 87a. Can be extracted. The photoelectric sensor 70 that has detected the hook non-locking state outputs an off signal to the controller 72, and the valve driving control by the controller 72 is restricted, so that the boom 30 cannot turn, undulate, extend and contract. Thus, since the operation of the boom 30 is restricted in the hook non-locking state, forgetting to lock the hook 93 can be alerted, and the risk of falling can be prevented.

  Further, the operation of the boom 30 may be restricted, and an alarm device may be provided on the vehicle body 10 or the work table 40 so that an alarm is issued. This alarm device may emit an alarm sound by a speaker or the like, may emit a light by a warning light, or may emit an alarm by color or characters by a panel or the like. As a result, forgetting to lock the hook 93 can be alerted visually or visually, and the safety is further improved.

  Furthermore, you may comprise the volt | bolts 75, 76, and 77 in the said embodiment as an electrically insulating volt | bolt (for example, resin volt | bolt).

  Further, in the above embodiment, the boom 30 of the aerial work vehicle 1 is a straight extension type that expands and contracts in the longitudinal direction. However, this may be a bending type or the like. The lifting device is not limited to one that can move the work table 40 three-dimensionally like the boom 30, and may be one that can only move the work table vertically like a scissor device.

It is a perspective view which shows the safety belt locking device of the aerial work vehicle which concerns on one Embodiment of this invention. It is a side view of an aerial work vehicle to which the safety band locking device is applied. It is a fragmentary sectional view of the work bench | platform of the aerial work vehicle to which the said safety belt locking device is applied. It is a perspective view which shows the state before attaching a cover member in the said safety belt locking device. It is a side view which shows the state until the hook of a safety belt is accommodated in the said safety belt locking device, (A) shows the state just before locking the hook to the said safety belt locking device, (B) Shows a state where the hook is locked to the safety band locking device and is in the disengagement position, and (C) shows a state immediately before the hook is inserted between the regulating members of the safety band locking device, (D ) Shows a state where the hook is accommodated in the safety band locking device and is in the working position.

Explanation of symbols

1 High-altitude work vehicle 30 Boom (lifting device)
40 work table 43 work table bracket 50 safety band locking device 51 hook bracket 51a opening 55 latching member 60 leaf spring (swinging biasing member)
61 Restricting member 70 Photoelectric sensor (locking detection means)
72 Controller 80 Cover member 81 Cover body member 85 Rubber cover member 87 Notch hole 90 Safety belt 91 Belt 92 Rope (tuna-shaped member)
93 hook
93a collar 93b opening / closing cap OP worker P1 engagement / disengagement position P2 work position

Claims (5)

A belt member that is used in an aerial work vehicle having a workbench provided on a vehicle body via a lifting device, and includes a belt member that is wound around a worker's body, and an opening / closing cap that opens and closes a buttock and a buttock of the buttock. A height provided on the workbench for detachably locking the locking device of a safety belt formed by including a locking device, and a rope-shaped member connecting the belt member and the locking device. A safety belt locking device for a work vehicle,
Hooking means disposed on the workbench and capable of engaging and disengaging the hook portion of the locking tool;
A cover member attached to the work table so as to cover the latching means with a notch hole through which the locking tool can be inserted;
The notch hole is configured so that the safety cap is connected to the cover member in a state in which the flange portion is inserted into the cover member through the notch hole in order to engage and disengage the locking device with the hooking means. An engaging / disengaging position located on the outer side, and a working position in which at least the flange portion and the opening / closing cap of the locking tool are covered by the cover member in a state where the locking tool is locked to the hooking means. And a safety belt locking device for an aerial work vehicle, wherein the safety belt locking device is configured to be movable between the two . A locking detection means provided on the locking means, for detecting that the locking tool is locked to the locking means, and that the locking tool is located at the working position;
Control means for permitting the operation of the lifting device when the locking detection means detects that the locking tool is locked to the hooking means and is positioned at the working position. The safety belt locking device for an aerial work vehicle according to claim 1. The latching means is
A bracket provided on the workbench, having an opening into which the locking tool can be loosely inserted;
A latch member provided in the opening of the bracket and capable of locking the locking tool;
3. The height according to claim 1, wherein the stopper is configured to restrict movement of the locking tool from the working position when the locking tool is positioned at the working position. Safety belt locking device for work vehicles. The stopper member is
A swing urging member having the other end attached to the outer part of the bracket such that one end protrudes from the outer part of the bracket;
A restriction member attached to the one end portion of the swinging biasing member so as to cover the opening and swinging so as to open and close the opening by the biasing force of the swinging biasing member. And
4. The safety belt locking device for an aerial work vehicle according to claim 3, wherein the stopper member is swung so as to be spread outward so that the locking tool can freely enter and exit the opening. . The notch hole of the cover member is formed to be narrower than the locking tool, and at least the outer peripheral edge of the notch hole is formed of an elastic member. Therefore, the notch hole is expanded by elastic deformation of the elastic member. The safety band locking device for an aerial work vehicle according to any one of claims 1 to 4, wherein the locking device is configured to be opened so that the locking tool can be inserted therethrough.

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