JP2591352Y2 - Telescopic boom for work platforms - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a telescopic boom for a work platform.

[0002]

2. Description of the Related Art In a high-altitude work vehicle, a turning table is installed on a body frame, a telescopic boom is pivotally supported on an upper portion of the turning table, and the telescopic boom is stored in a forwardly lowered state.

[0003] In this type of aerial work platform, the up-and-down cylinder of the telescopic boom is mounted between the swivel base and the base end boom, but is mounted between the swivel base and the retractable telescopic boom. In some cases, the up-and-down cylinder is disposed so that the mounting side of the telescopic boom is inclined upward, so that the space near the swivel base is used efficiently. It is installed on the upper surface of the end boom to secure the stroke length of the undulating cylinder.

In this type of aerial work vehicle, a hydraulic hose for driving to an attachment or the like attached to the tip of the telescopic boom is disposed along the telescopic boom. Some of the telescopic booms extend via a cable bear installed on the upper surface side of the telescopic boom.

[0005] In such an aerial work vehicle, since the pivot is located on the upper surface of the telescopic boom as described above, the cable carrier connected to the hydraulic drive hose is moved upward from the upper surface of the telescopic boom by the distance corresponding to the pivot. Are spaced apart from each other.

[0006]

As described above, in the conventional telescopic boom of this type of aerial work platform, the cable carrier is arranged to be separated from the upper surface of the telescopic boom by an amount corresponding to the pivot axis. The cable carrier is attached to the upper surface of the telescopic boom as a large protrusion, and when the telescopic boom is operated, this increases interference between the telescopic boom and an obstacle.

When the telescopic boom is retracted, the bent portion of the cable carrier is retracted to the side of the column, and the bent portion of the cable carrier is a factor for determining the height of the aerial work vehicle. , This height is increasing.

The present invention has been made in view of such circumstances, and in a telescopic boom of this type of aerial work vehicle, a projecting amount of a cable carrier installed on an upper surface of the telescopic boom is reduced, so that the telescopic boom can be used. It is an object of the present invention to reduce the risk of interference with an obstacle and reduce the height of an aerial work vehicle.

[0009]

SUMMARY OF THE INVENTION To achieve this object, the invention according to claim 1 comprises a telescopic boom which is mounted on a swivel of an aerial work platform so as to be able to rise and fall, and the base end of the telescopic boom. An up-and-down cylinder is interposed between the side boom and the swivel base, and a cable bear is installed between the upper surfaces of the base boom and the distal boom fitted to the base boom. Storing the telescopic boom in a forwardly lowered state, wherein a pivot for supporting one end of the up-and-down cylinder is installed above and separated from an upper surface of the proximal boom, and the pivot and the upper surface of the proximal boom are provided. And the cable carrier is inserted between them.

[0010]

According to the first aspect of the present invention, the pivot for pivotally supporting the up-and-down cylinder is installed upwardly away from the upper surface of the proximal boom, and the pivot between the pivot and the upper surface of the proximal boom is provided. Is inserted through the cable carrier, so that the position of the cable carrier can be made closer to the upper surface of the boom, and the upper surface position of the cable carrier can be lowered to reduce the amount of protrusion.

Therefore, the possibility that the telescopic boom interferes with an obstacle during operation is reduced, and the position of the bent portion of the cable carrier in the retracted state of the telescopic boom approaches the upper surface of the boom. The vehicle height can be reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an aerial work vehicle shown in the drawings.

First, an overall outline of an aerial work vehicle will be described with reference to FIG. 2, and FIG. 2 shows a state in which the aerial work vehicle is stored with a telescopic boom lowered forward.

In FIG. 2, reference numeral 1 denotes an aerial work vehicle;
Is a self-propelled body, and 3 is a swivel.

The swivel 3 is driven by a hydraulic motor to rotate about a vertical axis PP and is installed on the vehicle body 2. The swivel 3 has a support 4 on its upper surface. A telescopic boom 5 is pivotally supported at the upper end of the support portion 4 via a pivot 6 so as to be able to undulate.

The telescopic boom 5 has a four-stage configuration of a base end boom 5a, intermediate booms 5b, 5b ', and a distal end boom 5c. (See FIG. 1), and a bucket 7 is provided at the tip of the tip boom 5c.
Are mounted by the mounting bracket 8.

The proximal boom 5a corresponds to the proximal boom of the present invention, and the intermediate boom 5b corresponds to the distal boom of the present invention.

The bucket 7 is maintained in a horizontal position by a hydraulic device (not shown) irrespective of the up-and-down angle of the telescopic boom 5. The swinging of the bucket 7 and the like can be adjusted by an operator who has boarded the vehicle 7.

Further, between the support portion 4 and the base end boom 5a of the telescopic boom 5, an undulating cylinder 11 composed of a hydraulic cylinder for driving the telescopic boom 5 up and down is installed.

In this embodiment, the up-and-down cylinder 11 includes a mounting shaft 4a slightly above the support 4 and a base boom 5a.
And a pivot 12a installed on a bracket 12 installed on the upper surface on the free end side of the camera.

The pivot 12a is supported by the bracket 12 and is disposed at a position slightly above the upper surface of the base end boom 5a. This is to allow a cable carrier 13 to be described later to pass through a gap between the pivot 12a and the upper surface of the base end boom 5a.

Then, in order to enable the operation of the bucket 7 by the operation panel, in the aerial work vehicle 1 of this embodiment, the bucket 7 extends over the upper surface of the base end boom 5a and the intermediate boom 5b of the telescopic boom 5. , A cable bearer 13 is installed,
The required hydraulic pressure is supplied to and discharged from the bucket 7 via the cable bearer 13.

In this specification, the cable bearer is
A plurality of hydraulic hoses etc. are arranged side by side in parallel,
It is bent in a U-shape to enable deformation following the U-shape with a constant bending radius integrally with respect to displacement between the mounting portions at both ends.

In the cable carrier 13 of this embodiment, a restraining member consisting of a chain is arranged on both sides of a belt-like body in which a plurality of hydraulic hoses are arranged in parallel, and a connecting member is installed between the corresponding chain links on both sides. Thus, the plurality of hydraulic hoses are sandwiched between them to have a constant bending shape.

In this embodiment, the cable bearer 13 is turned up and down substantially on the upper surface of the base end boom 5a, and
The lower end 13b of the U-shaped cable bearer 13 is mounted on the upper surface of the intermediate boom 5b and is in the vicinity of the free end, and the upper end 13a of the cable bearer 13 is It is mounted on the upper surface of the proximal boom 5a.

That is, the cable carrier 13 extending from the upper end 13a of the cable carrier 13 to the support portion 4 side.
Is disposed above the pivot 12a on the upper surface side of the base end boom 5a as shown in FIGS. 1 and 3, and after being folded in a U-shape at the bent portion 13c on the support portion 4 side, The proximal end boom 5a extends toward the free end side immediately near the upper surface.

The cable bear 13 extending from the bent portion 13c toward the lower end 13b is inserted into the gap between the pivot 12a and the upper surface of the base end boom 5a, and the lower end of the cable bear 13 is inserted into the lower end 13b. It is arranged so as to reach the portion 13b.

The portion from the bent portion 13c to the lower end 13b of the cable carrier 13 is disposed on a gutter-like guide 17 having one end attached to the intermediate boom 5b and the other end supported by a roller 17a. Therefore, the guide 17 is not shown in FIG. 1 because the drawing is complicated in FIG.

A hydraulic hose 16 for supplying a required hydraulic pressure from a hydraulic device installed on the vehicle body 2 is connected to the upper end 13a of the cable bearer 13, and a hydraulic hose 16 is connected to the lower end 13b. A hose 16 is led out, and the hydraulic hose 16 extends toward the bucket 7 via the sheave 14 and the inside of the intermediate boom 5b.

The cable carrier 13 thus installed
The distance between the upper end 13a and the lower end 13b changes as the telescopic boom 5 extends.

In this case, the position of the bent portion 13c of the cable carrier 13 moves as shown by the imaginary line in FIG. 1 and corresponds to the change in the position. Is located on the base end side of the pivot 12a, the pivot 12a does not hinder the movement of the bent portion 13c, and does not hinder the operation of the cable bear 13.

In this embodiment, the pivot 13 is installed as described above, and the cable bear 13 is inserted between the pivot 12a and the upper surface of the proximal end boom 5a. 5a, the interference between the cable bearer 13 and an obstacle is reduced, and the height of the vehicle is less increased.

In general, when the cable carrier 13 is used, it is necessary to secure a space inside the U-shaped cable carrier 13 to allow the cable carrier 13 to be bent. , The pivot 12a is installed, so that the amount of protrusion of the cable bear 13 arranged on the upper surface side of the telescopic boom 5 is minimized.

Further, the lower end 1 of the cable carrier 13
Since 3b is located in the immediate vicinity of the upper surface of the base end boom 5a, it is possible to extend the hydraulic hose 16 guided from here through the sheave 14 into the intermediate boom substantially linearly from the lower end 13b of the cable bearer 13. Thus, the durability of the hydraulic hose 16 can be improved without using the flexible joint or the like to locally bend the hydraulic hose 16 to apply a large stress.

The embodiment described above relates to a four-stage telescopic boom, but the present invention is not limited to this.
It goes without saying that the same can be applied to a telescopic boom having two or more stages.

[0036]

As described above, according to the first aspect of the present invention, the pivot for pivotally supporting the up-and-down cylinder is installed to be spaced upward from the upper surface of the base end boom. Since the cable carrier is inserted between the upper surface of the end boom and the cable carrier, the position of the cable carrier can be made closer to the upper surface of the boom, so that the upper surface position of the cable carrier can be lowered and the amount of protrusion can be reduced.

Accordingly, the possibility that the telescopic boom will interfere with obstacles during operation is reduced, and the position of the bent portion of the cable carrier in the retracted state of the telescopic boom approaches the upper surface of the boom. The vehicle height can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a telescopic boom.

FIG. 2 is a schematic side view of an aerial work vehicle.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aerial work vehicle (aerial work vehicle) 4 Prop 5 Telescopic boom 5a Proximal boom (proximal boom) 5b Intermediate boom (distal boom) 11 Undulating cylinder 12a Axis 13 Cable carrier

Claims (1)

(57) [Scope of request for utility model registration] 1. A telescopic boom mounted on a swivel of a working vehicle at a height so as to be able to raise and lower, and an up / down cylinder is interposed between a base end boom of the telescopic boom and the swivel base, and the base end A cable carrier is installed between the upper surface of a side boom and a distal end boom fitted to the base end boom, and the telescopic boom is stored in a forwardly lowered state. An axle for pivoting is installed above the upper surface of the base end boom so as to be spaced apart therefrom, and the cable bear is inserted between the axle and the upper surface of the base end boom. Telescopic boom.