JPH0592297U - Safety equipment for work vehicles - Google Patents

Abstract

(57) [Abstract] [Purpose] In a work vehicle equipped with a swivel work device, the safety of the work vehicle for preventing interference between the swivel work device and a second body mounted near the swivel work device. Provide the device. A safety device includes storage detection means for detecting that the second body 10 is located at a predetermined storage position K provided in a swing operation range R, R'of the swing work device 3a.
When the storage detection means detects that the second body 10 is located at the predetermined storage position K, the operation detection means is configured to restrict the swing operation of the swing work device 3a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a safety device for a work vehicle equipped with a swingable working device such as a swingable boom.

[0002]

[Prior Art]

 On the body of an aerial work vehicle used for electric installation work on electric poles, a boom device (swing work device) that can be horizontally swung and raised and lowered is attached to the boom tip of the boom device. By raising and lowering the work table, a worker on the work table can easily move up and down. On the other hand, a work implement storage device (second bodywork) for mounting and storing tools used for electrical work etc. is mounted on the body of such an aerial work vehicle. The storage device is stored together with the tools in a predetermined storage position provided on the vehicle body, and can be moved to a position where the tools can be easily taken out.

[0003]

[Problems to be solved by the device]

 However, depending on the work vehicle, the predetermined storage position of the work implement storage device may be provided within the swing operation range of the boom device. In this case, if the boom device is operated while the work implement storage device is stored in the predetermined storage position, the boom device may interfere with the work implement storage device or the tools installed in the work implement storage device. I have a problem.

The present invention has been made in view of such a problem, and it is possible to prevent the boom device, that is, the swing work device from interfering with the work implement storage device, that is, the second body. The purpose of the present invention is to provide a safety device for a working vehicle.

[0005]

In order to achieve the above object, the safety device of the present invention comprises a storage detecting means for detecting that the second body is located at a predetermined storage position, and When the storage detecting means detects that the second bodywork is located at the predetermined storage position, it comprises an operation restricting means for restricting the swing operation of the swing working device.

[0006]

[Action]

 According to such a safety device, as long as the storage detecting means detects that the second bodywork is located at the predetermined storage position, that is, it is within the swing operation range of the swing work device. The operation restricting means restricts the turning operation of the turning work device and prevents the interference of both parties.

[0007]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 shows an aerial work vehicle 1 equipped with a safety device according to the present invention. A boom device (turning work device) 3 is attached to a vehicle body 2 of the aerial work vehicle 1, and the boom device 3 includes a turntable 3a that is horizontally swingably attached to the front center of the vehicle body 2. The telescopic boom 3b is mounted on the upper part of the swivel base 3a so as to be able to rise and fall. The telescopic boom 3b is configured to be telescopically extendable, and the workbench 4 is attached to the tip thereof. An operator can board the workbench 4, and the worker can easily move to an arbitrary height through each operation of the boom device 3. The swivel operation of the swivel base 3a is performed by the operation of a hydraulic swivel motor (see FIG. 4) built in the vehicle body 2, and the erection operation of the telescopic boom 3b is performed between the swivel base 3a and the lower surface of the telescopic boom 3b. The operation is performed by operating the hydraulic undulation cylinder 3c.

A tool storage 6 is mounted on the upper surface of the vehicle body 2 so as to surround the swivel base 3 a. The tool storage 6 can mainly store small tools. Further, on the ceiling surface 6a of the tool storage 6, a work implement storage device (second bodywork) 10 for storing a large tool (a ladder H is shown in the figure) is attached. .. The work implement storage device 10 will be described below with reference to FIG.

As shown in FIG. 2, the work implement storage device 10 has a guide rail 11 attached to the ceiling surface 6 a of the tool storage 6. The base end of the guide rail 11 is fixed near the center of the ceiling surface 6a in the vehicle width direction (refers to the right side when the drawing is viewed horizontally), and its tip extends to the side edge of the ceiling surface 6a. It is extended and fixed there. As can be seen from FIG. 1, two guide rails 11 are installed in parallel in the front-rear direction of the vehicle body 2.

Further, the work implement storage device 10 has a frame 12 that slides on these guide rails 11. A guide roller 21a that rolls in each rail step of the guide rail 11 formed in two upper and lower steps is attached to a leg portion 21 of the gantry 12, and each of the guide rollers 21a moves the gantry 12 to A position where substantially the whole does not project from the ceiling surface 6a of the tool storage 6 (hereinafter, referred to as a storage position K) and a position where almost the entire part projects laterally from the ceiling surface 6a of the tool storage 6 (hereinafter, the loading / unloading position). T) and guide the movement. A lock pin 22p extending in a direction perpendicular to the plane of the paper of FIG. 2 (rear of the vehicle body 2) is attached to the leg portion 21. By being inserted into the formed lock hole 11h (however, only the one formed at the base end portion is shown in the drawing), the entire gantry 12 is locked and held at the storage position K or the loading / unloading position T. It

The ladder H is loaded and unloaded on the frame portion 22 supported by the leg portions 21 while the pedestal 12 is in the loading and unloading position T. It is not easy to load and unload ladders H at a high position. For this reason, the frame part 22 is swingable downward with respect to the leg parts 21, and the ladder H can be loaded and unloaded while the frame part 22 is suspended along the side surface of the tool storage 6. It is like this. A damper stay 23 is attached between the leg portion 21 and the frame portion 22 to prevent the frame portion 22 from rapidly swinging downward.

According to the work implement storage device 10 configured as described above, after the ladder H is bound to the frame portion 22 with a band or the like (see FIG. 3), the frame portion 22 is lifted to store the entire gantry 12 therein. The ladder H can be easily stored simply by pushing it in the direction of the position K. On the other hand, the ladder H can be easily unloaded and used simply by pulling out the entire gantry 12 from the storage position K to the loading / unloading position T and lowering the frame portion 22 downward.

However, as shown in FIG. 3, the ladder H mounted on the gantry 12 at the storage position K falls within the swing operation range R of the swivel base 3a. Further, the pedestal 12 and the ladder H fall within the swing operation range R ′ of the hydraulic undulation cylinder 3c that swings as the swivel base 3a swings. When the swivel base 3 a is swung in such a state, the swivel base 3 a interferes with the ladder H and the hydraulic undulation cylinder 3 c interferes with the gantry 12. Therefore, the above-mentioned safety device is attached to the aerial work vehicle 1.

As shown in FIG. 4, the safety device 40 includes a storage detector 41 and an operation restricting section 42 including a restricting controller 42a and a restricting valve (solenoid valve) 42b. As shown in FIG. 2, the storage detector 41 is composed of a limit switch mounted near the base end of the guide rail 11, and is abutted and pushed by the leg 21 of the gantry 12 located at the storage position K. It turns on and outputs the stored signal (electrical signal).

When the regulation controller 42a receives the storage signal output from the storage detector 41, the regulation controller 42a sends an excitation signal to the solenoid of the regulation valve 42b. The regulation valve 42b is a swivel control valve 53 that controls the supply of the hydraulic pump 51 mounted on the vehicle body 2 and the hydraulic swivel motor 52 that swivels the hydraulic oil discharged from the hydraulic pump 51 to the swivel base 3a. It is mounted on a hydraulic line 55 that connects to (the turning control valve 53 is a solenoid valve that is switch-controlled according to the operation of an operator who is on the workbench 4). When the solenoid is in the non-excited state, the regulation valve 42b opens the hydraulic line 55 to allow the hydraulic oil to be supplied to the hydraulic swing motor 52, but the solenoid is excited by the excitation signal from the regulation controller 42a. As a result, the hydraulic line 55 is shut off and the hydraulic fluid discharged from the hydraulic pump 51 is drained to the tank 56.

According to the safety device 40 configured as described above, when the gantry 12 is located at the loading / unloading position T (including the state of swinging downward), the storage signal is output from the storage detector 41. Therefore, the swivel operation of the swivel base 3a is allowed. In this case, since the gantry 12 and the ladder H go out of the both swivel operation ranges R and R ', they do not interfere with the swivel 3a or the like. On the other hand, when the gantry 12 is located at the storage position K, a storage signal is output from the storage detector 41. Therefore, no matter how much the operator operates the swivel base 3a to rotate, The turning operation is restricted. As a result, the above-mentioned interference accident can be reliably prevented, and the work can be performed without damaging the gantry 12, the ladder H, or the like.

[0017]

[Effect of the device]

 As described above, in the safety device of the present invention, the turning operation of the turning work device is automatically restricted as long as the second body is located at the predetermined storage position. Therefore, if the safety device is used, for example, even if the worker tries to rotate the swing work device without noticing that the second bodywork is located at the predetermined storage position, the second work is performed. Interference between the bodywork and the turning work device can be reliably prevented, and damage to the second bodywork and the turning work device can be avoided.

[Brief description of drawings]

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

FIG. 2 is a rear view (view in the direction of arrow II in FIG. 1) of a work implement storage device (second bodywork) provided in the work vehicle for aerial work.

FIG. 3 is a plan view of the aerial work vehicle (III in FIG. 1).
FIG.

FIG. 4 is a configuration diagram of the safety device.

[Explanation of symbols]

 1 aerial work vehicle 3 boom device (turning work device) 10 work implement storage device (second bodywork) 11 guide rail 12 mount 40 safety device 42b regulation valve 52 hydraulic swing motor H ladder K predetermined storage position

Claims (1)

[Scope of utility model registration request] 1. A turning work device mounted on a vehicle body such that the vehicle can horizontally swivel with respect to the vehicle body, and a second body which is slidable or otherwise movable with respect to the vehicle body.
The second bodywork is a safety device for a work vehicle which is adapted to be stored in a predetermined storage position provided within a turning operation range of the turning work apparatus, wherein the second bodywork is the safety device. Storage detecting means for detecting that the second bodywork is located at the predetermined storage position, and the turning work device when the storage detecting means detects that the second bodywork is located at the predetermined storage position. A safety device for a work vehicle, comprising: an operation restricting unit that restricts the turning operation of the work vehicle.