JPH0339957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is used in the field of aerial work vehicles in which the boom supporting the gondola is of a retractable type.

(b) Prior art In general, an aerial work vehicle is equipped with outriggers at the four corners to stabilize the vehicle body during work, and the swivel platform that supports the boom device is equipped with outriggers at the four corners to reduce the concentrated load on some outriggers. The outrigger is located within the range of the outrigger and somewhat separated from the outrigger. Furthermore, in the case where the boom device is of a bending type with three or more stages, each boom is arranged in parallel, facing upward or downward.

However, in the case of a downward arrangement, the intermediate boom and the tip boom are obstructed by the struts and become shorter than the base boom, making it impossible to increase the overall length, and in the case of an upward arrangement, the intermediate boom and the tip boom are Although it is possible to make the sub-boom longer than the base boom, the disadvantage is that the center of gravity becomes higher and running stability is poor.

(c) Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks by arranging the base boom, middle boom, and tip boom side by side, so that each boom can be bent. It is.

(d) Means for Solving the Problems The present invention provides a pivotable support on the vehicle body, a base boom is pivotably supported at the front of the upper part of the support, and a base boom is mounted at the tip of the base boom. The base end of an intermediate boom, which is longer than the boom and is located on one side of the base boom, is pivotably supported such that it can be raised and lowered, and the intermediate boom has a gondola at the tip and a gondola on the other side of the base boom. The present invention relates to a retractable boom device with three or more stages for use in an aerial work vehicle, in which the base end of a disposed front boom is rotatably supported via a shaft disposed behind the column.

(e) Embodiment The following embodiment will be described with reference to the drawings. Reference numeral 1 denotes a vehicle body, and outriggers 2 are provided at the front, rear, left, and right corners of the vehicle body 1 to stabilize the vehicle body during work.

3 is a swivel base, and the swivel base 3 is located at the rear of the vehicle body 1;
In addition, it is mounted within the range of outriggers 2 at the four corners.

A support post 4 is erected on the swivel base 3, and the base end of a base boom 5 is pivotally supported on the upper part of the support support 4 so as to be able to rise and fall.

A first
A hydraulic cylinder 6 is provided, and the first hydraulic cylinder 6
The base boom 5 is raised and lowered by the expansion and contraction of the base boom 5.

An intermediate boom 7 having a length L longer than the length l of the base boom 5 is disposed on one side of the base boom 5 and the side of the support 4, and the tip of the base boom 5 and the base end of the intermediate boom 7 are bent. It is pivoted as possible.

A second hydraulic cylinder 9 is provided between the upper surface of the base boom 5 and a shaft 8 extending laterally from the upper surface of the intermediate boom 7, and the intermediate boom 7 is raised and lowered by expansion and contraction of the second hydraulic cylinder 9. ing.

A tip boom 10 having approximately the same length as the intermediate boom 7 is disposed on the other side of the base boom 5 and the side of the column 4, and a shaft 11 located behind the column 4.
The front end of the intermediate boom 7 and the base end of the front boom 10 are pivotally supported through the intermediate boom 7 , the front boom 10 side is fixed to the shaft 11 , and the intermediate boom 7 side is rotatable with respect to the shaft 11 .

A third hydraulic cylinder 13 is provided between the upper surface of the intermediate boom 7 and the free end of the arm 12 integrated with the shaft 11, and the front boom 10 is raised and lowered by expansion and contraction of the third hydraulic cylinder 13. It's summery.

14 is a gondola provided at the tip of the tip boom 10, and the gondola 14 is connected to an auxiliary hydraulic cylinder 15.
It is maintained in equilibrium at . 16 is a support stand when the gondola 14 is stored. With the above-described configuration, the present invention, when traveling, stores the booms 5, 7, 10 and gondola 14 in a compact manner as shown in FIG. 1 to lower the height of the center of gravity, and travels in that state.

Also, during work, after stabilizing the vehicle body 1 by extending outriggers 2..., each hydraulic cylinder 6, 9,
The gondola 14 is moved to an arbitrary work position by extending and contracting the boom 13 to raise and lower each boom 5, 7, and 10.

(f) Effect of the Invention As described above, the present invention provides a base boom in front of a column, an intermediate boom and a tip boom on both sides of the base boom, and a tip of the intermediate boom and a base end of the tip boom at the rear of the column. Since they are pivotally supported via the located shaft, the intermediate boom and the tip boom can be made longer than the base boom without jumping out from the vehicle body when the gondola is stored, increasing the overall length of the boom and increasing work efficiency. Furthermore, when storing the gondola, the entire boom can be stored compactly and with a low center of gravity, improving running stability.

[Brief explanation of drawings]

FIG. 1 is an overall view, and FIG. 2 is a diagram taken along A-A in FIG. 4 is a column, 5 is a base boom, 7 is an intermediate boom,
10 is the front boom, 11 is the shaft, and 14 is the gondola.

Claims (1)

[Claims] 1 A pivotable support is provided on the vehicle body, a base boom is pivotally supported at the front of the upper part of the support so that it can be raised and lowered, and a support that is longer than the base boom and located on one side of the base boom is provided at the tip of the base boom. The base end of an intermediate boom is pivotally supported so that it can be raised and lowered, and the base end of a tip boom, which has a gondola at its tip and is located on the other side of the base boom, is attached to the rear of the support column. A retractable boom device of three or more stages for use in an aerial work vehicle, which is pivotably supported via a shaft located thereon so that it can be raised and lowered.