JP2508112Y2 - Aerial work vehicle - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) This invention attaches a posture maintaining member that constantly maintains a predetermined posture to the tip of a telescopic boom that can be raised and lowered, regardless of the movement of the telescopic boom. The present invention relates to an improvement in an aerial work vehicle in which a bucket is attached to the posture maintaining member so as to be able to move up and down through an elevating mechanism including parallelogram link means.

(Prior Art) A conventional example of this type of aerial work vehicle will be described with reference to FIG. In FIG. 2, reference numeral 1 is a telescopic boom mounted on a swivel base 2 which is mounted on a vehicle A so as to be capable of swinging. A posture maintaining member 3 that always maintains a predetermined posture is attached to the tip of the telescopic boom 1 regardless of the ups and downs of the telescopic boom 1. The posture maintaining member 3 is pivotally connected to the distal end of the telescopic boom 1 so as to be capable of hoisting, and is controlled by a leveling cylinder 5 interposed between the distal end of the telescopic boom and the posture maintaining member 3 at a proper position. Therefore, regardless of the ups and downs of the telescopic boom 1, a predetermined posture is always maintained. Since such an up-and-down control mechanism for the posture maintaining member 3 is already known, further description will be omitted. A bucket 9 is attached to the posture maintaining member 3 via an elevating mechanism 8 including a parallelogram link mechanism 6 and a hydraulic cylinder 7.

The parallelogram link mechanism 6 of the elevating mechanism 8 has upper and lower links 12 and both ends which are pivotally connected 10a, 11a to both ends of an upper bracket 10 on the attitude maintaining member 3 side and an upper bracket 11 on the bucket side. It is provided with a lower bracket 13 on the posture maintaining member 3 side and a lower link 15 pivotally connected 13a, 14a to a lower bracket 14 on the bucket 9 side so as to be up and down.
The dimensions of the upper link 12 and the lower link 12 should be set so that the pivot links 10a, 11a and the pivot links 13a, 14a, and the pivot links 10a, 13a and the pivot connections 11a, 14a are parallel to each other and have the same distance. The size of the side link 15 and the position of each pivot connection are set.

The hydraulic cylinders 7 of the lifting mechanism 8 have their both ends pivotally connected at appropriate positions on the lower link 15 and the posture maintaining member 3 side.
The parallelogram link mechanism 6 is lifted up and down by the expansion and contraction of the parallelogram link mechanism 6, and the bucket 9 attached to the tip of the parallelogram link mechanism 6 is moved up and down.

In the conventional aerial work vehicle thus configured, the tip end position of the telescopic boom 1 can be set in a wide range by the ups and downs of the telescopic boom 1, and the position of the bucket 9 relative to the tip position of the telescopic boom 1 can be raised and lowered. Since it can be driven up and down by the mechanism 8, the position of the bucket 9 can be set in a wider range.

By the way, in the conventional aerial work vehicle, the upper link 12 and the lower link 15 in the parallelogram linkage mechanism 6 are arranged.
Are vertically separated from each other and the hydraulic cylinder 7 is attached without being protected from the outside. However, there is a problem that the hydraulic cylinder 7 is likely to collide with the work target object and be damaged.

The present invention is intended to solve the above-mentioned problems of the prior art.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the work platform for aerial work of the present invention comprises an elevating mechanism 8 composed of a parallelogram link mechanism 6 and a hydraulic cylinder 7 as follows. To do. That is, one of the upper link 12 and the lower link 15 in the lifting mechanism 8 is formed of a hollow cylinder, and the other of the upper link 12 and the lower link 15 is arranged so as to pass through the hollow cylinder of the one link. The hydraulic cylinder 7 is arranged such that one end thereof is connected to the inside of the hollow cylinder of the one link and at an appropriate position on the posture maintaining member 3 side or the bucket 9 side, and the one link formed by the hydraulic cylinder 7 is a hollow cylinder. Is configured to drive the undulations. .

(Operation) According to the above configuration, at least one of the other link and the hydraulic cylinder 7 is included in the link (the link of the upper link 12 and the lower link 15 that is formed by the hollow cylinder) that is driven up and down by the hydraulic cylinder 7. Since the parts are accommodated, it is possible to prevent a work target or a worker from being sandwiched between both links during high-altitude work, and to prevent the hydraulic cylinder 7 from colliding with the work target and being damaged.

(Embodiment) An embodiment of the aerial work vehicle of the present invention will be described below with reference to FIG. The present invention has the same constituent members as the conventional aerial work vehicle, and the characteristic part thereof is the related configuration of these constituent members. Therefore, the conventional high altitude work vehicle shown in FIG. The reference numerals used in the work vehicle refer to the same components, and are incorporated in the following description.

In FIG. 1, the lower link 15 in the elevating mechanism 8 is a hollow cylinder, and the upper link 12 passes through the hollow cylinder of the link 15. Hydraulic cylinder 7
One end of the lower link 15 is arranged between the hollow cylinder of the lower link 15 and the posture maintaining member 3 side so that the hydraulic cylinder 7 drives the lower link 15 up and down. Lower link composed of hollow cylinder and driven up and down by hydraulic cylinder 7
Although the weight of the bucket 9 is supported by the bending stress of the link, the lower link 15 is composed of a hollow cylinder.
Has a large second moment of area and is convenient for supporting the weight of the bucket 9.

Pivot connection 7b of the hydraulic cylinder 7 to the posture maintaining member 3 side
Is a pivotal connection of the link formed by the hollow cylinder to the posture maintaining member 3 side (in this case, the posture maintaining member 3 of the lower link 15).
Position of the other link displaced toward the posture maintaining member 3 side (in this case, the upper link 12 is pivotally connected to the posture maintaining member 3 side) than the pivotally connected portion 13a) side. It is done in. Particularly, in this embodiment, the hydraulic cylinder 7
The pivotal connection 7b to the posture maintaining member 3 side is located coaxially with the pivotal connection 10a to the posture maintaining member 3 side of the upper link 12, so that both connections are made by a single shaft. This is to reduce the number of axes. Of course, the relationship between the upper link 12 and the lower link 15 in the above embodiment may be reversed. The hydraulic cylinder 7 may of course be arranged between the link formed of a hollow cylinder and the bucket 9 side.

In this embodiment, the upper bracket 10 and the lower bracket 13 on the attitude maintaining member 3 side are attached to the swiveling member 3b which is fitted on the vertical support shaft 3a formed on the attitude maintaining member 3 so as to be horizontally swivelable. Also, the upper bracket on the bucket 9 side
The lower bracket 14 and the lower bracket 14 are provided on a member 16 having a vertical support shaft 16a, and the bucket 9 is attached to the vertical support shaft 16a of the member 16 so as to be horizontally rotatable. Such a configuration enables horizontal rotation on the posture maintaining member 3 of the elevating mechanism 8, and has an advantage that the movable range of the bucket 9 can be increased.

In any case, according to the elevating mechanism 8 having such a configuration, the other one of the links driven up and down by the hydraulic cylinder 7 (the upper link 12 or the lower link 15 on the side formed by the hollow cylinder) is used. Since at least a part of the hydraulic cylinder 7 and the hydraulic cylinder 7 are accommodated, a work object or a worker is sandwiched between both links during high-altitude work, and the hydraulic cylinder 7 collides with the work object and is damaged. This can be prevented.

(Effect) The aerial work vehicle configured and operated as described above is provided with the lifting mechanism 8
The work object or a worker is pinched between both links at the time of work at a high place, and the hydraulic cylinder 7 collides with the work object and is damaged even though it is a simple configuration in which a part of the above configuration is changed. It is possible to achieve a practically excellent effect of preventing the above.

[Brief description of drawings]

FIG. 1 is an explanatory view of an aerial work vehicle of the present invention, and FIG. 2 is an explanatory view of a conventional aerial work vehicle. Telescopic boom; 1, posture maintaining member; 3, parallelogram link mechanism; 6, hydraulic cylinder; 7, lifting mechanism; 8, bucket; 9, upper bracket; 10, 11, upper link; 12, lower bracket; 1
3,14, lower link; 15,

Claims (1)

(57) [Scope of utility model registration request] 1. A posture maintaining member that always maintains a predetermined posture regardless of the hoisting motion of the telescopic boom is attached to the tip end of the telescopic boom that can be raised and lowered. An aerial work vehicle to which a bucket is attached, and in particular, the lifting mechanism is an upper link whose both ends are pivotally connected to an upper bracket on the attitude maintaining member side and an upper bracket on the bucket side so as to be up and down, and both end parts are an attitude maintaining member. Side parallel bracket including a lower side bracket and a lower side link pivotally connected to the lower side bracket on the bucket side, and an upper or lower link of the parallelogram type link mechanism with respect to the posture maintaining member. A hydraulic cylinder for undulating drive, one of the upper link and the lower link in the lifting mechanism is a hollow cylinder. Of the lower link or the lower link is arranged so as to pass through the hollow cylinder of the one link, and further, the hydraulic cylinder has one end of the hydraulic cylinder at a proper position in the hollow cylinder of the one link and the other end thereof on the posture maintaining member side or An aerial work vehicle, which is connected to a proper position on the bucket side and is configured to drive one link up and down by the hydraulic cylinder.