JPH0721513Y2 - Safety equipment for aerial work vehicles - Google Patents

Description

[Detailed Description of Device] a. Purpose of the Invention (Field of Industrial Use) The present invention relates to a safety device for an aerial work vehicle having a work platform at the tip of a boom.

(Prior Art) A work vehicle for aerial work as shown in FIG. 3 is used for assembling a structure at a high place, equipment work and the like. This aerial work vehicle 30 is mounted on a trolley (vehicle) 31 that can travel freely.
A swivel base 32 that can be fully swiveled is attached to the swivel 31, and a boom 33 that is undulating and retractable is pivotally attached to the upper part of the swivel base 32, and a workbench 34 is provided at the tip of the boom 33. . An operating device for controlling the traveling of the carriage 31 and the operation control of the swinging and undulating of the boom 33 is provided on the side of the work table 34.
35 is attached. Therefore, the worker 36 who is on the workbench 34 moves the operation lever 35a of the operation device 35 forward, for example, to move the bogie 31 forward or raise and lower the boom 33 to perform an extension operation. The work table 34 can be moved toward an arbitrary work position in the structure 37 by moving the work table 34 backward by lowering the boom 33 up and down, and raising and lowering the boom 33 by shortening.

However, as described above, the swivel base 32 can perform the full swivel operation with respect to the carriage 31. Therefore, depending on the turning direction of the boom 33 with respect to the carriage 32, the operation lever 35a of the operation device 35 may be
Since the operating direction of the above does not match the traveling direction of the carriage 31 or the operating direction of the boom 33, the workbench 34 may be erroneously moved in a direction opposite to the direction in which it should be moved. For example, with the structure 37 approaching the worker 36,
If the work table 34 is accidentally moved in the direction of approaching the structure 37, the worker 36 interferes with the structure 37 and is sometimes sandwiched between the structure 37 and the work table 34. There is a risk that

Therefore, in order to prevent such an accident, for example, in order to prevent an accident in a state where the structure 37 is behind the worker 36 who is operating the operating device 35, as shown in the figure, An emergency stop bar 38 (pipe-shaped member) is horizontally disposed between the device 35 and the worker 36, and is swingably arranged downward.
When the worker 36 who has interfered with the structure 37 pushes down the emergency stop bar 38 downward by a part of the body as in the state of 36 'in the figure, the traveling of the carriage 31 or the operation of the boom 33 is stopped by the operation. The emergency stop control is performed.

(Problems to be solved by the invention) However, in the means for swinging a bar-shaped member such as the emergency stop bar 38 downward (or upward) as described above, the worker 36 who interferes with the structure 37 is in an emergency state. When the stop bar 38 is pushed toward its swing center, the emergency stop bar 38
There is a problem that the emergency stop control is not executed due to the interference of the worker 36 from the certain direction with respect to the emergency stop bar 38, such as the fact that the robot cannot be swung.

In view of the above problems, it is an object of the present invention to provide a safety device for an aerial work vehicle that allows an operator to execute emergency stop control regardless of the direction in which the worker interferes.

B. Device of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned object, in the present invention, a wire is
One end is fixed to the inside of the work table, the other end is laid so as to be movable in the axial direction at the other end, and the other end of this wire is pulled in the axial direction by a tensioning means. Then, when the movement detecting means detects the movement of the other end of the wire against the tensile force of the tensioning means, the regulating means regulates the operation of the vehicle or the boom.

(Operation) In such a safety device, when an operator interferes with the stretched wire from any direction, the other end of the wire is pulled and moved against the tensile force of the stretching means. By detecting the movement of the other end by the movement detecting means, the traveling operation of the vehicle operated by the worker or the operation of the boom is restricted, and the emergency stop control is executed.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

In an aerial work vehicle as shown in FIG. 3, a workbench 2 is attached to the tip of the boom 1 as shown in FIG. The workbench 2 has a floor 2a surrounded by a protective fence 20, and an operator rides inside the workbench to perform work. The workbench 2 includes a leveling cylinder (not shown) attached to the inside of the tip of the boom 1.
It is always held at the horizontal level by operating in response to the undulating movement of the. Further, the workbench 2 can swing laterally with respect to the tip of the boom 1.

An operating device 3 is attached to the upper portion of the workbench 2 on the boom attachment side. By operating each operation lever 3a of the operation device 3, the traveling control of the self-propelled carriage (see 31 in FIG. 3) to which the swivel supporting the boom 1 (see 32 in FIG. 3) is attached and It is possible to control ups and downs of the boom 1, expansion and contraction, control of turning operation, and swing of the workbench 2.

The safety device according to the present invention is attached to the workbench 2 having such a configuration.

The safety device 10 includes a wire 11, a spring (stretching means) 12,
It is composed of a cam 13 and a limit switch 14 (movement detecting means).

The wire 11 is provided between one of the protective fences 20 in the lateral direction at a height approximately equal to the height of the abdomen of the worker between the position where the operating device 3 is attached and the position where the operator operates the operating device 3. It is bridged from the pillar 21 on the side surface to the pillar 22 on the other side and facing the pillar 21. The end of the wire 11 on the side of the support column 21 is fixed to the support column 21. Hereinafter, the end of the wire 11 fixed to the column 21
It is called 11a.

On the other hand, the end of the wire 11 on the column 22 side is connected to the inside of the box member 15 attached to the column 22. FIG. 2 shows the inside of the box member 15.

A pulley 16 is attached to the upper portion of the box member 12. The end of the wire 11 on the support column 22 side extends downward through the pulley 16 and is movable in the up-down direction, that is, in the axial direction at this end (direction B in the drawing). Hereinafter, the end on the side of the column 22 will be referred to as the moving end 11b. In addition,
The moving end 11b is attached to the upper end of the spring 12 via a connector 17. The lower end of the spring 12 is fixed to the lower part of the box member 15. Therefore, the moving end 11b of the waiter 11
Is always pulled downward by the urging force of the spring 12, so that the wire 11 laid on the inside of the work table 11 is also usually pulled straight.

A cam 13 having a shoulder is attached to the connecting tool 11. Therefore, the cam 13 also moves up and down together with the moving end 11b of the wire 11.

The limit switch 14 is attached to the box member 15 so that the switch lever 14a comes close to the shoulder of the cam 13. This limit switch 14 moves the moving end of the wire 11.
The shoulder portion of the cam 13 moves upward together with 11b, and the switch lever 14a comes into contact with and is pushed to be turned on. The limit switch 13 is connected to a controller (restriction means) 18, and the controller 18 outputs a restriction signal when an ON signal from the limit switch 18 is input. Further, the controller 18 is connected to the operating device 3.

In the safety device 10 having such a configuration, as described above, due to the fact that the turning direction of the boom 1 and the front-back direction of the carriage do not match, the carriage is run in the wrong direction or the boom 1 is operated. Therefore, when the worker interferes with the structure and is pushed toward the operation device 3 side, the worker's body moves to the wire 11
And it is pushed out toward the operating device 3 side (direction C in FIG. 1). In addition, the wire 11 is not limited to the above-mentioned C direction,
It may be pushed from any direction, such as the vertical direction shown by D in FIG. The wire 11 extruded in this way is
Since the fixed end 11a is immovable, the moving end 11b is pulled against the biasing force (pulling force) of the spring 12 and moves upward, and the cam 13 moves upward and the limit switch 14
Turn on. For this reason, the operating device 3
A restriction signal is sent to the control device 3, and the operation of the trolley or boom 1 by the operation of the operation device 3 is restricted, whereby emergency stop control is performed.

Incidentally, the configuration inside the box member 15, without using the pulley 16,
The moving end 11b of the wire 11, the spring 12, the cam 13 and the limit switch 14 may be placed horizontally.

C. Effect of the Invention As described above, when the safety device of the present invention is used, the worker interferes with the wire stretched in the workbench, and the emergency stop control of the vehicle or the boom is executed regardless of the interference direction. Therefore, the safety of the worker during the work can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a workbench equipped with a safety device for an aerial work vehicle according to the present invention, FIG. 2 is a block diagram of the safety device, and a sectional view taken in the direction of the arrow A in the box member, FIG. FIG. 1 is a side view of a conventional safety device and an aerial work vehicle equipped with the same. 31 ... Bogie, 1, 33 ... Boom 2, 34 ... Workbench, 3, 35 ... Operating device 11 ... Wire, 12 ... Spring 13 ... Cam, 14 ... Limit switch

Claims (1)

[Scope of utility model registration request] 1. A safety device for an aerial work vehicle comprising a vehicle equipped with a boom and a workbench attached to the tip of the boom, wherein one end is fixed and the other end is inside the workbench. At the other end of the wire laid so as to be movable in the axial direction, a tensioning means for pulling the other end of the wire in the axial direction, and a wire for resisting the tensile force of the tensioning means. A movement detecting means for detecting the movement of the other end, and a regulating means for regulating the operation of the vehicle or the boom when the movement detecting means detects the movement of the other end of the wire. A safety device for aerial work vehicles.