JP2542270Y2 - Aerial work vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work vehicle in which a post erected on a chassis having a crawler-type traveling means is always kept vertically regardless of the inclination of the chassis in the front-rear direction. It is.

[0002]

2. Description of the Related Art Conventionally, when working indoor high places such as buildings,
As shown in FIG. 3, a scissor-type elevating device (hereinafter, simply referred to as an elevating device) 22 is provided on a chassis 21 having a crawler-type traveling means 21a, and an operator rides on the elevating device 22. An aerial work vehicle 20 equipped with a workbench 23 is used. For example, an aerial work such as installation of electric appliances or installation of duct equipment on a high place such as a ceiling in a room, and maintenance work on existing facilities such as interior work such as installation of duct equipment are performed. The fact is that it is being implemented efficiently.

[0003]

However, the aerial work vehicle 20 described above uses a crawler type traveling means 21a as a traveling means, and a lifting device 22 which can move up and down vertically on a chassis 21 having the traveling means 21a. Since the work platform 23 is also inclined when the chassis 21 inclines, the work platform 23 is also inclined. Therefore, the aerial work platform 20 is stopped in the middle of the stairs in which the chassis 21 inclines back and forth, and the work platform 23 is stopped. It cannot be used for high-altitude work on electric and air-conditioning equipment installed in the factory, and high-altitude work in such places has to be used together with scaffolds or stepladders of the assembly type. Therefore, the aerial work vehicle 2
For work on site where 0 can not be introduced, auxiliary workers must be arranged for assembling and dismantling work of scaffolding and lifting and lowering equipment, which hinders work efficiency and reduction of personnel, There have been various problems such as the development of a high-altitude work vehicle devised in some way so as to be adaptable to such work.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a post having a crawler-type traveling means and an upright post provided in the front and rear of the chassis. In order to provide an aerial work vehicle that always maintains a vertical state irrespective of the inclination in the direction, a chassis having crawler-type traveling means, and a rocker that can swing in the front-rear direction. It comprises a pivotally mounted telescopic post, a work table attached to the post and raised and lowered by the expansion and contraction of the post, and vertical holding means for vertically holding the post regardless of the inclination of the chassis.

[0005]

According to the present invention, the above construction is employed. Therefore, even if the chassis is inclined in the front-rear direction, the vertical holding means operates and the post is always held in a vertical state. Even when the vehicle is stopped at a position inclined in the front-rear direction to perform the work, the post is held vertically, and therefore, the bucket attached to the post is also held in a horizontal state, so that the work at high places can be performed safely.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the aerial work vehicle according to the present invention will be described in detail with reference to FIGS. The aerial work vehicle 1 according to the present invention includes a chassis 1a that is driven by a pair of crawlers 1b provided on the left and right, a post 2 standing upright at substantially the center in the left-right direction at a position in front of the chassis 1a, and 2 and a bucket 3 attached perpendicularly to the post 2.

In this embodiment, as shown in FIG. 1, the posts 2 are formed in three stages in which an intermediate post 2b and an upper post 2c are sequentially inserted into the base post 2a so as to be extendable and retractable upward. It expands and contracts by the expansion and contraction operation of a built-in expansion cylinder (not shown). The post 2 is a chassis 1a.
A pair of brackets 1c, 1c mounted in parallel on the upper surface of
And a base post 2a located between the brackets 1c and 1c.
By inserting a pin into the lower end of the chassis 1a in the lateral direction of the chassis 1a, the pin 2 is pivotally attached to the chassis 1a so as to be swingable in the front-rear direction. Regardless, it is held vertically. The bucket 3 is attached to the tip post 2c so as to be located above the chassis 1a.

The vertical holding means 4 includes a bracket 2d projecting from a lower rear end surface of the base post 2a,
A leveling cylinder 4a disposed between brackets 1d protruding substantially at the center in the left-right direction at substantially the center of the chassis 1a.
A pump 4b for supplying hydraulic oil to the leveling cylinder 4a, and the pump 4b and the leveling cylinder 4a.
And a leveling valve 4c for controlling the expansion and contraction operation of the leveling cylinder 4a.

In the present embodiment, the leveling valve 4c is described in a leveling valve of a workbench equilibrium holding device (Japanese Utility Model Publication No. 64-1352) which has been proposed and published by the present applicant. The leveling cylinder 4a is extended or contracted in accordance with the inclination of the chassis 1a in the front-rear direction, and the post 2 is swung forward or backward with respect to the chassis 1a. Irrespective of this, the post 2 is always kept in a vertical state.

Hereinafter, the operation of the aerial work vehicle according to the present invention will be described based on the above embodiment. That is, since the aerial work vehicle 1 according to the present invention travels with the pair of crawlers 1b provided on the left and right, it can travel not only on a flat work site but also on an inclined site such as a staircase. it can. Also,
When performing work in high places, the telescopic cylinder having a built-in post 2 vertically mounted on the chassis 1a extends and retracts to a predetermined height by the expansion and contraction operation of the telescopic cylinder, and the bucket 3 attached vertically to the upper post 2c is raised and lowered. Work at high altitudes is very easy. In particular, when the aerial work vehicle 1 is stopped in the middle of stairs or the like where the chassis 1a is inclined in the front-rear direction to perform the aerial work, the post 2 and the bucket 3 originally erected on the chassis 1a also have the chassis 1a. In the aerial work vehicle 1 according to the present invention, the vertical holding means 4, that is, the pump 4b for supplying hydraulic oil to the leveling cylinder 4a and the oil chambers of the leveling cylinder 4a are inclined. Since the leveling valve 4c disposed in the oil passage connecting the two detects the inclination and controls the expansion / contraction operation of the leveling cylinder 4a, the post 2 is always kept in a vertical state regardless of the inclination of the chassis 1a. The bucket 3 vertically mounted on the upper post 2c of the post 2 is also held horizontally. Therefore, the working posture of the worker boarding the bucket 3 is also stably maintained irrespective of the inclination, and safe work at a high place becomes possible.

Although the leveling valve 4c has been described as the vertical holding means 4 in the above-described embodiment, other devices may be used, and the invention is not limited to the above-described embodiment. Further, the means for maintaining the vertical state of the post 2 has been described using the leveling cylinder 4a. However, such means may be constituted by another device, and is not particularly limited to the above-described embodiment.

[0012]

As described in detail above, the present invention provides a chassis having crawler-type running means, a telescopic post pivotally mounted on the chassis so as to be swingable in the front-rear direction, and a post mounted on the post. A work table that moves up and down by the expansion and contraction of the post,
Since it is configured with vertical holding means for holding the post vertically irrespective of the inclination of the chassis, when performing work at a high working position above a slope site such as in the middle of the stairs, the chassis moves along the stairs. Even if the post is erected, the post standing on the chassis is held vertically by the vertical holding means, so that the bucket vertically mounted on the post can be held horizontally,
It is possible to perform work at high places by moving up and down to a predetermined height. Therefore, various excellent effects such as the efficiency of work, the reduction of the number of personnel, and the safe work can be achieved without the necessity of using a combined scaffold or stepladder conventionally used in such an inclined site. Having.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an aerial work vehicle according to the present invention;

FIG. 2 is an explanatory view showing a vertical holding means of a post of the aerial work vehicle of FIG. 1;

FIG. 3 is an explanatory view showing a conventional aerial work vehicle having crawler-type traveling means;

[Explanation of symbols]

 Reference Signs List 1 aerial work platform 1a chassis 1b crawler 1c bracket 1d bracket 2 post 2a base post 2b intermediate post 2c upper post 2d bracket 3 bucket 4 vertical holding means 4a leveling cylinder 4b pump 4c leveling valve

Claims (1)

(57) [Scope of request for utility model registration] An undercarriage having a crawler-type traveling means, an extendable post pivotally attached to the undercarriage in a front-rear direction, and a work table attached to the post and moved up and down by extension and retraction of the post, And a vertical holding means for holding the post vertically regardless of the inclination of the chassis.