JPS5948240B2 - Lifting equipment for aerial work vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lifting device for an aerial work vehicle.

Conventionally, a lifting device has been installed near the work platform installed on an aerial work vehicle, but the rotating part of the lifting device is fixed to the boom side and is a separate structure from the work platform. Therefore, a worker on the workbench must manually perform the turning operation, which is inconvenient to handle and has the drawback of poor workability.

The present invention solves this drawback.

Examples of the present invention are attached below (to be described in detail with reference to 7 drawings, 1)
is an aerial work vehicle, and a conventionally known boom 2 is mounted on the vehicle frame so as to be extendable, retractable, up and down, and swingable.

Reference numeral 3 denotes a workbench installed at the tip of the boom 2, which is kept in a horizontal state by a balance device (not shown) during work.

Further, the workbench 3 is configured to be able to pivot relative to the boom 2 by operating a pivot mechanism 4 consisting of a hydraulic cylinder, a rack, and a pinion.

On the other hand, a lifting device 5 is installed at the tip of the boom 2.

The lifting device 5 includes a post outer cylinder 6 fixed to the boom 2 side.
and a post inner cylinder 7 which is rotatably supported within the outer cylinder, and which is pivoted to the inner cylinder 7 by a pivot part 9 so as to be able to rise and fall freely, and a number of perforations 10 and 10 are formed, and pins 11 are used as appropriate. A winch bracket 12 that is equipped with a winch mechanism 13 and can be fixed to the undulation plate 8 with a pin 14, and a plurality of pin holes 16, 16 and pins for the winch bracket 12. The winch boom 15 is connected to the winch boom 17 so that its length can be expanded and contracted, and each of these components is configured to be easily assembled and disassembled.

In this embodiment, the undulating plate 8 and the winch bracket 12 are configured separately so that they can be separated or fixed by inserting and removing the pin 14, but the separation structure using the pin 14 is abolished and the two are configured in advance as one piece. However, it may also be used as an undulating bracket.

By the way, a bracket 18 is fixed near the end of the workbench 3, and a lever 19 is rotatably pivoted 20 to this racket 8.

A boss 2 is provided with a connecting pin 21 rotatably supported at one end of the lever 19 and mounted on the bracket 18.
1' is inserted.

On the other hand, the flange 22 of the post inner cylinder 7 has a large number of concentric holes 2.
3... is bored, and the lever 1 is inserted into this hole 23.
The connecting pin 21 of 9 is always inserted by the weight of the lever 19.

Therefore, the workbench 3 and the lifting device 5 are connected by the connecting pin 21.
The lever 19 is pulled upward against its own weight from the position shown in FIG.
As long as 1 is not removed from the hole 23, the integral relationship between the two is maintained.

In addition, 24 is a post outer cylinder 6 fixed to the boom 2 side (
This is a fixing pin that secures the flange 6') and the post inner cylinder 7 (flange 22) fitted into the post outer cylinder 6 when traveling, and can be moved in any direction by the rotation mechanism 4 or manual operation during lifting work. The winch boom 15 is fixed in a predetermined direction and set in a running position.

Then, during the lifting operation, the fixing pin 24 is pulled out from the post outer cylinder 6, and the post inner cylinder 7 and workbench 3, which are integrated via the above-mentioned connecting pin 21, are connected to the post outer cylinder 6.
In other words, it is rotatable relative to the boom 2.

Next, to explain the operation of this device, a post inner cylinder 7 is rotatably supported within a post outer cylinder 6 fixed to the boom 2 side, and both are secured by a fixing pin 24. The center of rotation of the lifting device 5 and the center of rotation of the lifting device 5 are on the same axis.

In this case, the pivoting portion of the lifting device 5 is usually connected to the connecting pin 21.
The lifting device 5 and the workbench 3 are fixed to the workbench 3 side by first pulling out the fixing pin 24 from the post inner cylinder 7 and driving the rotation mechanism 4 with the connecting pin 21 inserted. The two rotate as one, and the relative positional relationship between the two does not change.

On the other hand, by pulling out the connecting pin 21 against the weight of the lever 19 and then driving the turning mechanism 4, only the work platform 3 can be driven to turn, and the lifting device 5 can be manually set to any turning angle. Can be rotated.

Thereafter, when the connecting pin 21 is inserted again and the lifting device 5 is fixed, the lifting operation can be performed at that position.

Moreover, this lifting device 5 can be raised and lowered by inserting a pin 11 into one of a number of holes 10 made in a raised and lowered plate 8 which is pivotally supported by a pivot part 9 so as to be raised and lowered with respect to the inner post cylinder 7. The length of the winch boom 15 can be adjusted by arbitrarily changing the position and inserting the pin 17 into any one of the pin holes 16 and 16 drilled in the winch boom 15, and the winch boom 15 can be attached to the winch bracket 12. By operating the winch mechanism 13, the lifting device 5 can be freely operated in each direction of extension/contraction, up/down, and rotation to perform lifting work.

Although the winch mechanism 13 is arranged on the winch boom 15 via the winch brat 12, the arrangement position thereof is not limited.

In other words, since the center of rotation of the lifting device and the center of rotation of the workbench are on the same axis, the relative position with respect to the post outer cylinder does not change due to the rotation of the workbench, so the winch mechanism 13 is placed at the bottom of the workbench 3, or Even if it is placed on the boom 2, if the lifting wire rope of the winch mechanism 13 is inserted into the above-mentioned pivot shaft and guided to the winch boom 15 side, the wire rope can be attached to the wire rope by the rotation of the work platform 3 or the lifting device 5. Lifting work can be carried out without excess or deficiency.

As described above, in the present invention, the pivot center of the workbench and the pivot center of the lifting device are located on the same axis, so that the lifting device can be fixed regardless of the pivoting operation of the workbench. By connecting the two, the lifting device can be rotated at the same time using the rotating mechanism of the workbench.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Fig. 1 is an overall side view of an aerial work vehicle equipped with this device, Fig. 2 is a side view showing the device partially omitted, and Fig. 3 4 is a front view thereof, and FIG. 5 is a perspective view showing a state in which the workbench and the post inner cylinder are connected. 2...Boom, 3...Workbench, 4...
... Rotating mechanism, 5 ... Lifting device, 6 ...
...Post outer cylinder, 7...Post inner cylinder, 8...
...Luffing plate, 13...Winch mechanism, 15...Winch boom.

Claims (1)

[Scope of Claims] 1. In an aerial work vehicle that is provided with a workbench at the tip of the boom and is equipped with a lifting device near the workbench, the workbench is configured to be able to rotate with respect to the boom using a rotation mechanism. A lifting device for an aerial work vehicle, characterized in that the center of rotation of the lifting device is located on the same axis as the center of rotation of the work platform. 2. The lifting device for an aerial work vehicle according to claim 1, wherein the work platform and the lifting device are configured to be connectable, and the lifting device can be rotated by a rotating mechanism of the work platform.