JP2922799B2 - 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 having a movable vehicle body and a movable boom mounted on the vehicle body.

[0002]

2. Description of the Related Art An aerial work vehicle in which a workbench is provided at the end of a boom that can be raised and retracted in order to move an operator to a desired height is provided with a driving cabin in front of a vehicle body. In some cases, a cargo bed is provided behind the vehicle body. A swivel is arranged on this carrier,
A telescopic boom is provided on the swivel so as to be able to move up and down. Then, a worktable on which a worker can be mounted is provided at the distal end of the telescopic boom, and the worker is moved to a desired height by performing up / down, telescopic, and turning operations of the boom.

In such an aerial work vehicle, jack devices are provided on the front, rear, left and right sides of the vehicle body in order to secure the stability of the vehicle body when the boom is operated. This jack device is arranged to freely expand and contract toward the lower part of the vehicle body, and by extending it downward until a ground reaction force is obtained, it acts in the direction of tipping the vehicle body during boom operation It stably supports the vehicle body against a moment (hereinafter, referred to as a “falling moment”). And
As the jack device, an outrigger jack device configured to be able to expand and contract in the width direction of the vehicle body in order to more stably support the vehicle body may be used.

[0004] The outrigger jack device is configured as a pair on the left and right, and the pair of outrigger jack devices are disposed at the front and rear ends of the carrier. Here, each of the outrigger jacks constituting the pair of jack devices has an outrigger beam extending and contracting with respect to a vehicle body (loading carrier) having a predetermined length, and a hydraulic cylinder and the like for performing an extending and retracting operation are provided. For this purpose, they are arranged shifted (alternately) in the front-rear direction.

[0005] After the work is completed, the boom is in a retracted state in which the boom is folded down and reduced, and the stability of the aerial work vehicle during traveling is maintained. Here, in order to maintain the stability of the vehicle body during traveling or to reduce the parking space during parking, the total height H is preferably as low as possible. For this reason,
When the boom is stored, if the boom is lowered on the loading platform until the angle of the boom becomes a depression angle, the height up to the upper portion of the work table can be reduced. In this case, in order to efficiently store the boom on the bed, the swivel is slightly swung so that the tip of the boom is located near one of the front, rear, left and right ends.

[0006]

The outrigger jack device for an aerial work vehicle constructed as described above requires a predetermined stroke in the vertical direction, so that the outrigger near the boom tip is located. There is a problem that the upper end of the jack may interfere with the boom tip, and a long boom cannot be provided.

The present invention has been made in view of such a problem, and is an aerial work vehicle capable of reducing the external dimensions of a vehicle body in a stored state of a boom, which interferes with a jack device when the boom is stored. It is an object of the present invention to provide an aerial work vehicle that can be installed without a boom having a long overall length.

[0008]

In order to achieve the above-mentioned object, an aerial work vehicle according to the present invention has a driving cabin disposed at a front portion of a vehicle body and a loading platform disposed at a rear portion. A boom that can be freely raised and turned and that is stored in an upright retracted state with a depression angle is disposed behind the carrier.
Further, a front jack device including a pair of left and right outrigger jacks that can extend and contract from the inside of the carrier to the sides of the carrier is disposed at least near the front end of the carrier. The pair of outrigger jacks are disposed so as to be shifted in the front-rear direction of the vehicle body, and when the boom is in the retracted retracted state and the tip of the boom is located near one of the left and right ends of the front end of the loading platform, the boom An outrigger jack, the upper end of which is located near the front end of the carrier, is disposed on the front side of the carrier.

In the aerial work vehicle constructed as described above, the boom is pivotally supported by the swivel base and is disposed in front of or behind the luggage carrier, and the boom is lowered with a depression angle, so that the boom is tilted to the left or right at the front end of the luggage platform. Even when the jack is located near the end of the jack, the distance from the boom tip where the upper end of the jack device is close to the swivel (or the diagonal length when the carrier is rectangular) can be long. it can. As a result, the length of the installed boom can be increased, so that the working range at the time of operating the boom is not narrowed while the external dimensions of the vehicle body during storage of the boom are reduced.

[0010] In addition, an aerial work vehicle in which the center of rotation of the swivel platform is disposed in front of the loading platform, and a rear jack device configured in the same manner as the front jack device is disposed near the rear end of the loading platform. When the tip of the boom is located near one of the left and right ends of the rear end of the bed in the storage state of the boom, the outrigger jack whose upper end is located near the tip of the boom is located in the bed. By arranging the boom on the rear side, the length of the boom can be lengthened in the same manner as described above, and the working range at the time of operating the boom does not become narrow while reducing the external dimensions of the vehicle body when the boom is retracted.

[0011]

FIG. 1 shows a preferred embodiment of the present invention.
This will be described with reference to FIG. This aerial work vehicle 1
Reference numeral 0 denotes a configuration in which an operating cabin C is provided at the front of the vehicle body 11 and a carrier 11a is provided at the rear. A swivel table 12 that can freely perform horizontal swivel operation with respect to the vehicle body 11 is mounted on the carrier 11a. Here, the turning table 12 is disposed such that the turning center S is located behind the center K of the rear axle that supports the rear wheel R for running the vehicle body 11.

A boom 1 telescopically (in a telescopic manner) is provided on the upper part of the swivel table 12 so as to be freely expandable and contractible.
3 is pivotally mounted so as to be able to move up and down by the expansion and contraction operation of the up and down cylinder 15. The extension and retraction operation of the boom 13 is performed by an extension and retraction operation of an unillustrated telescopic cylinder disposed in the boom 13. Furthermore, at the tip of the boom 13,
Vertical post 1 which always maintains a vertical state by a leveling mechanism (not shown) irrespective of the elevation angle of boom 13
6 are provided. An arm member 17 is attached to the vertical post 16 so as to be able to freely turn horizontally, and a work table 14 on which an operator can be mounted so as to be able to freely turn horizontally is attached to the arm member 17.

When working at a high place, the boom 13 is raised, contracted, expanded,
By performing the turning operation, the operator who is on the work table 14 can be moved to a desired height. Then, by performing the turning operation of the arm member 17, it is possible to finely adjust the moving position of the work table 14 after moving to a high place.

In the aerial work vehicle 10 constructed as described above, outrigger jacks 19 are arranged at four front, rear, left and right sides of the loading platform 11a in order to secure the stability of the vehicle body 11 at the time of aerial work. ing. This outrigger jack 1
Numeral 9 is configured to be able to expand and contract toward the side of the loading platform 11a (the vehicle body 11) and to be able to expand and contract downward (toward the ground). When the boom 13 is used, each outrigger jack 19 is extended toward the side of the vehicle body as shown by a two-dot chain line in FIG. The vehicle body 11 is stably supported by being extended and the jack 19 being grounded.

The jack device comprises a pair of left and right outrigger jacks 19, 1 disposed at the front end of the loading platform 11a.
9 'and a pair of left and right outrigger jacks 19 "and 19"' arranged at the rear end of the loading platform 11a. Since these outrigger jacks 19 and the like have the same configuration, the loading platform is provided. The configuration of the outrigger jack 19 provided on the left side of the front end will be described as an example.

The outrigger jack 19 includes an outrigger box 19a provided on the carrier 11a, an outrigger beam 19b slidably disposed in the outrigger box 19a, and an outer post 19c vertically mounted on the outrigger beam 19b. And an inner post 19d formed to extend and contract downward with respect to the outer post 19c, and a ground plate 19e attached to a lower end of the inner post 19d. In addition, a pair of left and right outrigger jacks 19,
The outrigger box 19a and the like 19 'are disposed so as to be exposed to the carrier 11a, and the outrigger boxes of a pair of left and right outrigger jacks 19 "and 19"' arranged at the rear end of the carrier 11a are inside the carrier 11a. It is arranged in.

Here, the outrigger beam 19b is formed to have a predetermined length, and a telescopic cylinder (for extending the outrigger beam 19b) with respect to the outrigger box 19a at the rear end thereof. (Not shown), the space in the length direction (the width direction of the carrier 11a) required for disposing the outrigger jack 19 is at least half the width of the carrier 11a.
For this reason, each outrigger jack 19,
Reference numeral 19 'is disposed so as to be shifted in the front-rear direction. Further, the outer post 19c and the inner post 19d are arranged such that the upper end of the outer post 19c protrudes from the upper surface of the carrier 11a in order to obtain a predetermined minimum ground clearance when storing and a predetermined extension amount.

In the aerial work vehicle 10 configured as described above, the boom 13 is to be stored after the work is completed.
The boom 13 is reduced, and the boom 13 is lowered until the front of the boom 13 is lowered (has a depression angle). At this time, the swivel base 12 is slightly turned to the right so that the tip of the boom 13 (the position where the vertical post 16 is attached) is located to the front right of the load base 11a (to be substantially diagonal to the load base 11a). Then, when the boom 13 is stored,
Further, the arm member 17 is turned to the left, and
4 is also turned to the left so that it is substantially parallel to the boom 13. As a result, the boom 13 and the worktable 14 are in the most compact state in plan view in the retracted state, and are located in the carrier.

For this reason, the outrigger jack 19 'at the right front end of the carrier 11a on the side where the tip of the boom 13 is located in the aerial work vehicle 10 is disposed forward of the outrigger jack 19 at the left front end. Have been. Therefore,
The boom 13 disposed on the vehicle body 11 can be widened on the right side of the bed 11a without interference between the tip of the boom 13 and the outer post 19c '.
Can be lengthened. In addition, since the boom 13 can be stored with the front of the boom 13 lowered, even when the work table 14 is disposed at the tip of the boom 13 via the vertical post 16, the storage is possible. In this state, the overall height of the aerial work vehicle 10 can be kept low.

In the above embodiment, the boom 13
Is described at the right front end of the loading platform 11a. However, when the front end of the boom 13 is located at the left front end, the outrigger jack 19 disposed at the left front end is positioned forward. You can make it happen. In the above embodiment, when the tip of the boom 13 is located at one of the left and right front ends, the outrigger jacks 19 "and 19""are also provided near the rear end of the loading platform 11a. However, in the present invention, it is not always necessary to dispose outrigger jacks at the front, rear, left and right ends of the carrier, and at least when the boom 13
It is sufficient that the outrigger jack is provided on the side where the leading end of the outrigger is located.

Further, in the above embodiment, the swivel 1
2 is arranged behind the carrier 11a, but the present invention is not limited to such a case. As shown in FIG. 3, the swivel platform 12 is arranged in front of the carrier 21a.
The aerial work vehicle 20 may be configured such that the front end of the boom 13 is located behind the loading platform 21a. In this case, the outrigger jack 19 ″ on the side where the tip of the boom 13 is located may be located behind the carrier 21a.
In this case, the front outrigger jacks 19 and 19 'are not necessarily required, as described above.

[0022]

As described above, the aerial work vehicle of the present invention
When storing a boom that can be freely moved up and down and swiveled on the bed, the boom tip is located near the left or right end of the front end of the bed. A front jack device including a pair of outrigger jacks is disposed at least to the left and right of the front end of the loading platform in the front-rear direction, but the outrigger jack having the boom tip located in the vicinity is disposed on the front side of the loading platform. Have been. Thereby, when the boom is stored in the down position, a large storage space can be secured in the bed, so that the length of the installed boom can be increased without interference between the boom tip and the jack device. Therefore, a wide range of work can be performed, and the outer dimensions of the vehicle body can be reduced during storage.

In the case where a swivel is provided in front of the loading platform and the boom is arranged toward the rear of the loading platform, at least the front end of the boom of the rear jack device provided near the rear end of the loading platform is located near the loading platform. By arranging the outrigger jack located on the rear side of the cargo bed, the length of the boom arranged in the same manner as described above can be lengthened, and the outer dimensions of the vehicle body can be reduced when the boom is retracted and stored. .

[Brief description of the drawings]

FIG. 1 is a top view of an aerial work vehicle according to the present invention.

FIG. 2 is a side view of the aerial work vehicle.

FIG. 3 is a top view of another aerial work vehicle according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 aerial work vehicle 11 body 12 turning table 13 boom 14 work table 15 undulating cylinder 16 vertical post 17 arm member 19 outrigger jack

Claims (2)

(57) [Claims] An operating cabin is provided at a front portion of the vehicle, and a luggage carrier is provided at a rear portion of the vehicle body so as to be able to travel. A boom that is freely disposed and stored with an angle of depression, and a workbench that is horizontally rotatably disposed on the boom, and at least near a front end of the loading platform to stably support the vehicle body. A front jack device comprising a pair of left and right outrigger jacks which are extendable and contractable to the side of the loading platform from the inside of the loading platform and are displaced in the front-rear direction of the loading platform, The center of rotation of the swivel platform is located behind the luggage platform, and the tip of the boom is located near the right front end or the left front end of the luggage platform in the retracted retracted state. Aerial wherein said outrigger jack located the upper portion near the tip of the boom is arranged on the front side of the loading platform in collapsed stored state. 2. A car body which can run with a driving cabin disposed in a front part and a luggage carrier disposed in a rear part; a swivel pivotably disposed on the luggage carrier; A boom that is freely disposed and stored with an angle of depression and tilted down, a work table that is horizontally rotatably disposed on the boom, and at least a rear end of the loading platform to stably support the vehicle body A high work vehicle comprising: a rear jack device configured by a pair of left and right outrigger jacks that are disposed in the vicinity of the loading platform so as to be able to expand and contract from the loading platform to the sides of the loading platform and are displaced in the front-rear direction of the loading platform. Wherein the center of rotation of the swivel platform is located in front of the luggage platform, and the tip end of the boom is located near the right rear end or the left rear end of the luggage platform in the retracted and retracted state; In the jack device, before Aerial said outrigger jack upper end to the vicinity of a leading end portion of the boom collapsed stored state is positioned is equal to or disposed on the rear side of the loading platform.