JPH0249279Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operation regulating device for an aerial work vehicle equipped with a lifting device.

2. Description of the Related Art High-altitude work vehicles used in electrical work such as transformer replacement work are often equipped with a load lifting device for convenient work. In the case of an aerial work vehicle equipped with a load lifting device, there is a state in which the work vehicle is only mounted on the work platform, and a state in which a worker is mounted on the work platform and the load is lifted using the load lifting device. Because the work range within which the work platform can be moved is different, there was a risk that the work vehicle would fall if it was operated with a lifted load in the same way as when a worker was on the work platform.

This invention was developed in view of the above circumstances, and automatically switches the regulated work range of an aerial work vehicle between the state in which a load lifting device is used and the state in which a load lifting device is not used, thereby preventing the occurrence of falling accidents. An object of the present invention is to provide an operation regulating device for a vehicle for working at high altitudes, which is equipped with a lifting device that prevents the above.

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 shows an aerial work vehicle equipped with a load lifting device.A telescopic boom 3 is pivotally attached to a swing base 2 provided on a vehicle body 1 so as to be able to rise and fall freely, and a work platform is attached to the tip of the telescopic boom 3. 5 is balanced and a load lifting device 6 is attached.

FIG. 2 shows the working range of the aerial work vehicle 10, and A
is the work range when a worker is on the workbench and a load lifting device is used,
B is the working range only when a worker is on the workbench, and therefore, when the load lifting device is not used, the working range is the sum of A and B.

As shown in FIGS. 3 and 4, the load lifting device 6 includes a frame portion 7 and a pin 1 on the frame portion 7.
3, a winch bracket 8 pivotally attached to the winch bracket 8 so as to be swingable in the front-rear direction, a winch 14 attached to the winch bracket 8, a sub-boom 9 attached to the frame part 7, and a rope wound and let out by the winch 14. 11, and a hook 12 suspended from the tip of the sub-boom 9, and a shaft 15 is attached to the winch bracket 8, which slides on the side surface of the frame portion 7 in the front-rear direction as the winch bracket 8 swings. A cam 16 is attached to the shaft 15, and a spring 1 is inserted between the shaft 15 and the frame portion 7 at the front and rear of the cam 16.
8 and 18', and the frame portion 7 is provided with a sensor for detecting the use of a load lifting device to which a limit switch 17 is attached. When the tension is applied, the winch bracket 8 swings forward against the force of the springs 18, 18', the shaft 15 slides forward, and the cam 16 fixed to the shaft 15 moves the limit switch 17. Activate. In Fig. 3, 21 is a switch that is switched by a signal from the limit switch 17, 19 is a state in which the load lifting device is used, that is, a setting device for the working range of A in Fig. 2, and 20 is a state in which the load lifting device is not used. That is, in FIG. 2, A+B is a working range setting device, 22 is a working position detector, 23 is a comparator, and 24 is an alarm or an operation stop device.

With the above configuration, when the load lifting device 6 is not in use, the winch bracket 8
does not swing, the shaft 15 does not slide, and the limit switch 17 does not operate, so the comparator 22
A signal from the work range setting device 20 is sent to the work table 5, and the work table 5 can move within the range of A+B in FIG. The device 23 is activated to issue an alarm or to stop the operation of the aerial work vehicle. Hook 1 using load lifting device 6
2 lifts the load, the winch bracket 8 swings forward, the shaft 15 slides forward against the biasing force of the spring 18', the cam 16 operates the limit switch 17, and the changeover is activated. 20 is switched, a signal from the work range setter 18 is sent to the comparator 22, and the work table 5 can be moved within the range A in FIG. If this is attempted, the alarm or operation stop device 23 is activated to issue an alarm or to stop the operation of the aerial work vehicle.

In addition, when using the load lifting device 6 as a temporary arm, as shown in FIGS. 3 and 4,
The hook 12 is locked to the eye 25 provided on the rear upper surface of the sub-boom 9, and the sub-boom is slid in the vertical direction by winding and feeding out the winch 14. At this time, the winch bracket 8 swings rearward, As a result, the shaft 15 slides rearward against the biasing force of the spring 18, and the cam 16 operates the limit switch 17, thereby regulating the working range of the workbench 5 within the range A in FIG.

As described above, according to the present invention, the different regulated work ranges for the state in which the load lifting device is used and the state in which the load lifting device is not used of the aerial work vehicle equipped with the load lifting device are determined by the use and non-use of the load lifting device. The present invention is effective in improving the safety of aerial work vehicles equipped with a load lifting device. Due to the damping effect of the springs provided at the front and rear, the limit switch does not operate even with minute load fluctuations, and the vibrations of the winch bracket that occur during load fluctuations quickly settle down, resulting in stable operation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a side view of the aerial work vehicle, Fig. 2 is a working range diagram, Fig. 3 is an explanatory diagram of the operation regulating device, and Fig. 4 is a detailed view of the main parts. be. 5...Workbench, 6...Load lifting device, 7...
...Frame part, 8...Winch bracket, 9...
...Subboom, 10...Aerial work vehicle, 11...Rope, 12...Hook, 13...Pin, 14...
Winch, 15...Shaft, 16...Cam, 1
7... Limit switch, 18, 18'... Spring,
19, 20... Working range setting device, 21... Switching device, 22... Working position detector, 23... Comparator,
24... Alarm or deactivation device.

Claims (1)

[Scope of utility model registration request] In the operation regulation device for an aerial work vehicle equipped with a work platform and a load lifting device at the tip of the boom, there is a setting device that sets the regulation work range when the load lifting device is used, and a regulation when the load lifting device is not used. In addition to providing a setting device for setting the working range, a winch bracket is pivotally connected to the frame portion of the load lifting device so as to be swingable in the front-back direction, and as the winch bracket swings, the side surface of the frame portion is pivoted in the front-back direction. a shaft attached to a winch bracket so as to be slidable; a cam attached to the shaft; and a spring inserted through the shaft and provided between frame portions in front and behind the cam;
A sensor is installed to detect the use of a load lifting device consisting of a limit switch attached to the frame and activated by contact with a cam by the sliding of the shaft, and a signal from the limit switch of this sensor is used to control the restricted work range. An operation regulating device for an aerial work vehicle equipped with a lifting device, characterized in that the device is configured to switch.