JPH0592298U - Safety equipment for aerial work vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] The safety of the operator is not provided inside the protective fence attached to the workbench without any member that interferes with normal work, and while suppressing the increase in the weight of the workbench. To provide a safety device for an aerial work vehicle capable of ensuring the safety. [Structure] The safety device is attached as a part of the pillar 16 to the vertical direction of the pillar 16 of the protective fence 15 provided on the workbench 10, and is elastically deformed by the force applied to the upper side of the protective fence 15. Elastic member 21 and this elastic member 2
1, a deformation detecting means for detecting elastic deformation of the elastic member 21 and outputting a signal for restricting the vertical movement of the workbench 10 and the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a safety device for an aerial work vehicle.

[0002]

[Prior Art]

 An aerial work vehicle equipped with a workbench that can be freely moved up and down is used for electric work on the poles and construction work in high places. An operator can board the work table and move to a desired height by moving the work table up or down to easily perform the above work. A protective fence with an appropriate height is provided around the upper surface of the workbench to prevent workers on the workbench from falling.

By the way, in such an aerial work vehicle, the body of the worker on the workbench interferes with a structure or the like existing at a high place and is caught between the structure and the protective fence. Safety devices are provided to prevent situations. In the conventional safety device, the bar member is supported at a suitable height position inside the protective fence in a state of being floated by a spring or the like, and the worker is likely to interfere with the structure, etc. By pushing down with a hand or body, a regulation signal for regulating the further upward and downward movement of the workbench was output.

[0004]

[Problems to be solved by the device]

 However, in the conventional safety device, since the bar member or the like is provided inside the protective fence, the bar member or the like often becomes an obstacle during normal work, and such bar member or the like is placed on the workbench. However, there is a problem in that the weight of the workbench increases, which is not desirable.

The present invention has been made in view of such a problem, and it is possible to ensure the safety of the operator without hindering the normal work and suppressing an increase in the weight of the workbench. It is intended to provide a safety device for an aerial work vehicle.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the safety device of the present invention, an elastic member is attached as a part of the pillar to the vertical middle part of the pillar of the protection fence provided on the workbench. Then, the elastic deformation of the elastic member elastically deformed by the force applied to the upper part of the protective fence is detected by the deformation detecting means built in the elastic member, and a signal for controlling the up-and-down movement of the workbench etc. Is output.

[0007]

[Action]

 In such a safety device, since a part of the pillar of the protective fence is formed by an elastic member, the upper side of the protective fence is normally held in a floating state with respect to the lower side. For this reason, if the worker on the workbench is likely to interfere with the structure, etc., and if a force is applied to the upper part of the protective fence in the direction of pushing it down or pushing it out to the side, the amount will be slightly increased. A restriction signal is output from the deformation detection means incorporated in the elastically deformed elastic member, and further movement of the workbench is restricted.

[0008]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, FIG. 3 shows an aerial work vehicle 30 equipped with a safety device according to the present invention. This aerial work vehicle 30 is provided with a swivel base 32 which is capable of horizontally swiveling above the lower traveling device 31. A boom 33, which is configured to be telescopically expandable and contractible, is attached to the upper part of the swivel base 32 so as to be capable of undulating. The lower traveling device 31, the swivel base 32, and the boom 33 are operated by receiving the pressure oil discharged from the hydraulic pump P mounted in the swivel base 32. Further, the workbench 10 is horizontally held at the tip of the boom 33, and the worker M can be mounted on the workbench 10.

By the way, the workbench 10 is provided with a protective fence 15 for preventing the worker M from falling from the workbench 10, the details of which are shown in FIG. The protection fence 15 connects four pillars 16, ..., 16 vertically set up at the four corners of the workbench 10 and extends in the horizontal direction to connect the upper ends and the lower parts of the four pillars 16 ,. It is composed of an upper horizontal frame 17 and a lower horizontal frame 18 attached so as to The columns 16 and the horizontal frames 17 and 18 are assembled by welding or the like using pipe-shaped members.

Then, the worker M who is on the workbench 10 configured as described above controls the traveling operation of the lower traveling device 31 and operates the swivel base 32 by operating the operation device 19 attached to the workbench 10. By controlling the operation of the boom 33 and the boom 33, it is possible to move up and down together with the workbench 10 to a desired height. However, during such movement to a high place, as shown in FIG. 3, an operator M on the workbench 10 makes a mistake in operating the operating device 19 so that his / her body interferes with the structure C. There is a risk of causing it. In such a case, it is necessary to urgently stop the movement of the workbench 10 toward the side closer to the structure C. Therefore, the work vehicle 30 is equipped with the above safety device. The safety device will be described below with reference to FIGS. 1 and 2.

The safety device 20 includes an elastic member 21 attached to a middle portion of each of the columns 16 in the vertical direction as a part of the columns 16, a deformation detector 22 built in the elastic members 21, and a turning member. It is composed of a regulation controller 23 and a regulation valve (solenoid valve) 24 mounted in a table 32. The elastic member 21 is formed into a columnar shape from an elastic material such as rubber, and normally, the upper part of the pillar 16 and the upper horizontal frame 17 (hereinafter collectively referred to as the upper part of the protective fence 15) are pillars. The lower part of 16 is held in a floating state. Then, as shown in FIG. 2, the upper end portion thereof undergoes compressive deformation when it receives a force F from above, and shear deformation when it receives a horizontal force F ′.

The deformation detector 22 is composed of a pressure-sensitive switch or the like, detects when the elastic member 21 has a compression deformation or a shear deformation, and outputs the electric signal input from the battery 25 as a control signal. To do. When the regulation controller 23 receives the regulation signal output from the deformation detector 22, the regulation controller 23 energizes the solenoid of the regulation valve 24 to close the valve 24. The closed regulating valve 24 closes the oil passage connected to the hydraulic fluid P discharged from the hydraulic pump P so that the hydraulic fluid is not supplied to the lower traveling device 31, the boom 33, etc., and drains it to a tank (not shown).

In the safety device 20 configured in this way, as shown in FIG. 3, the worker M who is on the workbench 10 is likely to interfere with the structure C, and avoids the structure C while holding the hand. When a force is applied to the upper part of the protective fence 15 by the body in the direction of pushing it down or pushing it out to the side, the elastic member 21 is deformed and a deformation signal is output from the deformation detector 22. Is surely prevented from moving so that it approaches the structure C. In this way, a situation in which the worker M is caught between the protective fence 15 and the structure C can be prevented in advance.

It should be noted that the inside of the protective fence 15 on the workbench 10 does not have a bar member or the like required for the conventional one, and during normal work, the work is carried out using the entire inside of the protective fence 15. be able to. Therefore, it is more advantageous than the conventional one in terms of workability. Further, since it is not necessary to provide such a bar member or the like, the weight of the workbench 10 can be reduced, and the range of movement of the workbench 10 can be expanded as compared with the conventional case.

[0015]

[Effect of the device]

 As described above, in the safety device of the present invention, when a force is applied to the upper part of the protective fence that is held in a floating state by the elastic member in the direction of pushing it down or pushing it out to the side, the elastic member causes the elastic member to move. Elastic deformation is detected, and further movement of the workbench is automatically restricted. For this reason, with this safety device, it is not necessary to install a bar member that receives the above-mentioned pushing down force in addition to the protective fence as in the conventional case, and the inside of the protective fence can be used during normal work. You can work smoothly. Further, the workbench can be made lighter because the bar member and the like are not provided, and the work range in the aerial work vehicle, that is, the range of movement of the workbench can be expanded.

[Brief description of drawings]

FIG. 1 is a perspective view of a workbench of an aerial work vehicle equipped with a safety device according to the present invention.

FIG. 2 is a configuration diagram of the safety device.

FIG. 3 is a side view of the aerial work vehicle.

[Explanation of symbols]

 10 Workbench 15 Guard fence 16 Strut 20 Safety device 21 Elastic member 22 Deformation detector 30 High-altitude work vehicle M Worker C Structure P Hydraulic pump

Claims (1)

[Scope of utility model registration request] 1. A safety device for an aerial work vehicle equipped with a workbench that can be freely moved up and down, and the like, which is provided as a part of the pillar in the up-down direction middle part of the pillar of the protective fence provided on the workbench. An elastic member attached and elastically deformed by a force applied to the upper side of the protection fence, and a built-in elastic member for detecting elastic deformation of the elastic member and restricting up-and-down movement of the workbench, etc. A safety device for an aerial work vehicle, comprising: a deformation detecting means for outputting a signal.