JPH0644762Y2 - Roller jack device for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a roller jack device for a vehicle provided in an aerial work vehicle or the like, and particularly relates to vehicle support measures.

(Prior Art) Generally, for example, in an aerial work vehicle, as disclosed in JP-B-454563, an expandable boom is provided on a chassis so that the boom can be raised and lowered and swung freely. In some cases, a bucket is provided at the tip of the boom, while roller jacks are provided at both the front and rear sides of the chassis. The roller jack has a jack in which an inner cylinder is fitted in an outer cylinder so that the inner cylinder can be retracted and attached, and a roller is rotatably supported by a lower end of the inner cylinder via a bracket.

Then, the inner cylinder of the roller jack is projected toward the ground, the rollers are grounded to support the chassis, and the bucket is moved to a predetermined position to perform work in high places. Further, the rollers are rotated at a slight speed so that the chassis can be moved back and forth while the bucket is positioned at a high place or the like.

(Problems to be Solved by the Invention) In the above-described roller jack for an aerial work vehicle, the roller is only attached to the inner cylinder via the bracket.

However, this allows the chassis to be supported by rollers when the road surface, which is a supporting surface, is hard, but when the road surface is weak, the rollers are reduced in the road surface because the pressure receiving area of the roller is small. There was a problem of getting crowded. As a result,
There is a risk that the aerial work vehicle may fall and the chassis support is unreliable.

The present invention has been made in view of the above problems, and an object of the present invention is to reliably support the chassis without the rollers being reduced to the road surface.

(Means for Solving the Problems) In order to achieve the above object, the means taken by the present invention is to provide an auxiliary plate.

Specifically, the means taken by the present invention is as follows. First, a jack is attached to the chassis, the jack is configured to be able to project downward, and a roller support bracket is attached to the lower end of the jack. ing. Further, it is premised on a roller jack device for a vehicle in which rollers for rolling on a supporting surface of the vehicle are rotatably supported on the support bracket.

An auxiliary plate, which is formed in a horizontal flat plate shape and extends toward the outside of the roller from the support bracket, is attached to the lower end of the support bracket and is positioned above the lower end of the roller.

(Operation) With the above configuration, in the present invention, when supporting the chassis,
Overhang the jack down and bring the roller into contact with the support surface. The chassis is supported by the grounding of the rollers, and various work is performed.

Then, in the state where the chassis is supported, if the ground contact portion of the roller is soft, the roller will be reduced to the support surface, but the auxiliary plate comes into contact with the support surface, and by the roller and the auxiliary plate, It will support the chassis. That is, the pressure receiving area is increased by the auxiliary plate, the chassis is securely supported without tilting, and the chassis is prevented from falling over.

(Embodiment) An embodiment of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 2, reference numeral 1 denotes a work vehicle for high places, which is used for working at high places such as exchange of telephone lines.

The aerial work vehicle 1 is configured such that a bucket 4 is attached to a tip end of a boom 3 provided on a chassis 2 and four roller jacks 5, 5, ... Are provided on both front and rear sides of the chassis 2. . A swivel base 6 is provided at the front of the chassis 2 and a support bracket 6a for the boom 3 is erected on the swivel base 6. The base end of the boom 3 is pinned to the support bracket 6a. It is connected by 6b so that it can rise and fall freely. A hoisting cylinder 7 is pin-connected between the boom 3 and the support bracket 6a, and the boom 3 is swung by the drive of the swivel base 6 and is hoisted by the expansion and contraction of the hoisting cylinder 7. ing.

Further, although not shown, the boom 3 is configured to be telescopically expandable and contractable, and the supporting member 8 of the bucket 4 is attached to the tip of the boom 3 and the supporting member 8 is provided.
A bucket 4 is attached to. Further, the support member 8
Although not shown, a posture control mechanism that supports the bucket 4 in a horizontal state is provided, and a swing control mechanism that rotates the bucket 4 to the left and right is provided.

The bucket 4 is formed into a box having an open upper surface, and is attached to the support member 8 on one side surface. Further, the bucket 4 is provided with an operation box 9 for moving the bucket 4. The operation box 9 includes a swivel lever for rotating the swivel base 6, a hoisting lever for expanding and contracting the hoisting cylinder 7, and a telescopic lever for expanding and contracting the boom 3. Etc., and is configured to be operated by an operator in the bucket 4.

A tool box 10 is provided at the center of both sides of the chassis 2, and a side wall 11 is continuously provided upright from the rear end of the tool box 10 to the rear end of the chassis 2. The side wall 11
The front half is formed on the opening / closing door 11a and the rear plate is formed on the fixed wall 11b.The opening / closing door 11a is configured such that the front end is pivotally supported to open sideways, and the opening / closing door 11a is opened. Then, the worker is configured to get on and off the chassis 2.

The roller jack 5 is a feature of the present invention. As shown in FIG. 3, the roller jack 5 is provided with the roller 52 and the auxiliary plate 53 is provided. The jack 51 is constructed by inserting an inner cylinder 55 into an outer cylinder 54 so that the inner cylinder 55 can be retracted and retracted, and the outer cylinder 54 is fixed to the chassis 2. Further, the inner cylinder 55 is fitted and inserted from the lower surface of the outer cylinder 54,
Although not shown, a hydraulic cylinder is provided between the inner cylinder 55 and the outer cylinder 54 so that the inner cylinder 55 can project downward.

Further, a support bracket for the roller 52 is provided at the lower end of the inner cylinder 55.
A support bracket 56 is attached, and the support bracket 56 is formed into a box having an open lower surface, is formed into a substantially trapezoidal shape in a side view, and is fixed to the inner cylinder 55 at the upper surface. The roller 52 is inserted into the support bracket 56, is rotatably supported by the bracket 56 by a lateral pin 57 of the chassis 2, and is supported by the support bracket 56.
It projects slightly downward and is configured to be rollable on the road surface A which is a support surface.

Further, the auxiliary plate 53 is formed on a horizontal flat plate parallel to the road surface A, and extends toward the front and rear outside the roller 52 from the lower end front edge and the lower end rear edge of the support bracket 56, It is integrally fixed to the support bracket 56. The auxiliary plate 53 is provided slightly above the lower end of the roller 52, and when the roller 52 is reduced to the road surface A, the auxiliary plate 53 comes into contact with the road surface A to support the chassis 2.

Next, a work operation of the work platform 1 will be described.

First, at the time of work, the operator in the bucket 4 operates the levers and the like of the operation box 9 to rotate the swivel base 6 to swivel the bucket 4, while expanding and contracting the undulating cylinder 7 and expanding and contracting the boom 3. Go and move the bucket 4 to a predetermined position. Then, the worker in the bucket 4 carries out various works such as exchange of telephone lines.

During this work, each roller jack 5,5 ...
Is projected downward from the outer cylinder 54, the roller 52 is grounded on the road surface A to support the chassis 2, and when changing the construction position, the roller 52 is rolled while the bucket 4 is kept at a high place. The aerial work vehicle 1 moves forward or backward at a slow speed.

The roller 52 is pressed against the road surface A, and when the road surface A is soft, the roller 52 is reduced to the road surface A. When the roller 52 is reduced, the auxiliary plate 53 is attached to the road surface A. Ground. This auxiliary plate 53 allows the roller 52
Is regulated, and the chassis 2 is reliably supported. That is, the pressure receiving area is expanded by the auxiliary plate 53,
The tilt of the chassis 2 is suppressed, and the chassis 2 is prevented from falling.

Further, since the support bracket 56 covers the roller 52, the fender function is exerted.

In the present embodiment, the auxiliary plate 53 is formed only on the front edge and the rear edge of the support bracket 56, but it may also be formed on the left and right edges of the support bracket 56. Further enlargement makes the support of the chassis 2 more reliable.

Although the roller jacks 5 are provided on both front and rear sides, they may be provided only on both rear sides.

Further, the present invention is not limited to an aerial work vehicle, but can be applied to various vehicles.

(Effect of the Invention) As described above, according to the present invention, since the auxiliary plate is provided at the lower end of the jack, the pressure receiving area can be increased by the auxiliary plate even when the roller is reduced to the supporting surface. . As a result, since the chassis can be supported by the auxiliary plate and the rollers, the chassis tilt can be surely prevented, and the chassis can be securely prevented from tipping over. Can be improved and the safety of various operations can be improved.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a side view of an aerial work vehicle, and FIG. 2 is a plan view of the same. FIG. 3 is a sectional side view showing a main part of the roller jack. 1 ... Aerial work vehicle 2 ... Chassis 5 ... Roller jack 51 ... Jack 52 ... Roller 53 ... Auxiliary plate 56 ... Support bracket A ... Road surface

Claims (1)

[Scope of utility model registration request] 1. A jack is attached to an undercarriage, the jack is configured to be capable of projecting downward, a roller support bracket is attached to a lower end of the jack, and a vehicle support is attached to the support bracket. In a roller jack device for a vehicle in which a roller rolling on a surface is rotatably supported, a horizontal flat plate shape is formed at a lower end of the support bracket and extends from the support bracket toward the outside of the roller. A roller jack device for a vehicle, characterized in that an auxiliary plate is mounted above the lower end of the roller.