JPH0694354B2 - Bucket horizontal holding device for aerial work vehicles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bucket horizontal holding device for an aerial work vehicle.

(Prior Art) Conventionally, in this type of aerial work vehicle, a bucket horizontal holding device is provided with a horizontal cylinder c between a bucket a and a boom b, as shown in FIG. The cylinder c is disposed inside the tip of the boom b, and its rod end is connected to a bracket d protruding from the bucket a. The cylinder c expands and contracts in response to the hoisting motion of the boom b to keep the bucket a horizontal. Is configured to hold.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional one, since the horizontal cylinder c is connected between the bucket a and the boom b in a substantially horizontal state, the connection between the tip of the boom b and the bucket a. However, there is a problem in that the space required for the boom becomes large, which is an obstacle to the realization of miniaturization, and the expansion and contraction efficiency of the boom b becomes poor. There is also a problem that the structure becomes complicated and the cost becomes high.

(Means for Solving the Problem) The bucket horizontal holding device for an aerial work vehicle according to the present invention is
In an aerial work vehicle in which a turning post is rotatably mounted on a vehicle body, and a boom having a bucket at a tip end thereof is provided on the turning post so that the boom can extend and contract and can be raised and lowered. Side of the bucket, the tip of the boom is provided on the rear surface of the bucket and is pivotally supported by the substantially central portion of the bracket, and the bucket is provided between the boom and the bucket corresponding to the hoisting operation of the boom. A horizontal cylinder for horizontally holding the boom, the horizontal cylinder having one end connected to the tip of the boom and the other end connected to the lower end of the bracket provided on the bucket, It is arranged between the bucket and the bucket vertically or slightly inclined from the vertical.

(Operation) While the bucket is arranged substantially parallel to one side of the tip of the boom, the tip of the boom is pivotally supported on the rear surface of the bucket and substantially in the center of the bracket, and between the boom and the bucket. A horizontal cylinder that holds the bucket horizontally corresponding to the boom swelling motion, one end of the horizontal cylinder being connected to the tip of the boom, and the other end being the lower end of the bracket provided on the bucket By connecting the horizontal cylinder to the boom and the bucket vertically or slightly inclined from the vertical, the space required for mounting the horizontal cylinder is reduced and the boom and bucket are connected. Make the area around the unit compact.

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

1 and 2 show a schematic structure of an aerial work vehicle.

A turning post 2 is erected upright on the vehicle body 1,
A base end portion of a boom 3 is pivotally supported on an upper end portion of the turning post 2, and the boom 3 is configured to be capable of hoisting by a hoisting cylinder 5 arranged between the boom 3 and the turning post 2. The boom 3 is configured to be extendable and retractable by an extendable cylinder (not shown). A bucket 6 is attached to the tip of the boom 3.
Is provided.

As shown in FIG. 3, the bucket 6 is pivotally supported by a horizontal shaft 62 via a bracket 61 at a substantially central portion on the rear surface of the side portion. A horizontal cylinder 7 is provided between the boom 3 and the bucket 6. The horizontal cylinder 7 has a base end 7a.
Is connected to the tip of the boom 3 and the rod end 7b
Is connected to the lower portion of the rear side surface of the bucket 6 via a bracket 61, and is arranged between the boom 3 and the bucket 6 in a state slightly tilted from the vertical. The horizontal cylinder 7 exchanges pressure oil with a telescopic cylinder 8 arranged between the base end of the boom 3 and the upper end of the turning post 2. That is, the horizontal cylinder 7 and the telescopic cylinder 8
Are configured to extend and contract in synchronization with opposite directions, and the horizontal cylinder 7 extends and contracts in this way, so that the bucket 6 is always held horizontally in response to the hoisting motion of the boom 3. Is configured as follows. Specifically, for example, when the bucket 6 rises to the position shown by the chain double-dashed line in FIG. 3 due to the extension of the hoisting cylinder 5, the telescopic cylinder 8 is forcibly extended by the raising operation of the boom 3. At this time, the supply of the pressure oil to the piston chamber of the telescopic cylinder 8 necessary for the extension of the telescopic cylinder 8 is sucked from the piston chamber of the horizontal cylinder 7, whereby the horizontal cylinder 7 has the same extension stroke of the telescopic cylinder 8. Only the stroke will be degenerated. Due to the contraction of the horizontal cylinder 7, the bucket 6 rotates in the clockwise direction in FIG. 3 around the horizontal shaft 62, and the bucket 6 maintains the horizontal state even when it is raised to the position shown by the chain double-dashed line in FIG. It will be. Further, when the boom 3 is laid down, the operation is reversed.

Further, the bucket 6 is provided with an operating portion 63, and by operating the operating portion 63, the swing, undulation, and extension / contraction of the boom 3 can be controlled.

A sprocket 21 is provided at the base end of the turning post 2. A chain 22 is wound around the sprocket 21 in a U-shape. Of the two cylinders 23 of which one end 22a is provided in parallel on the vehicle body (in this example, only the front cylinder is shown) 23, It is connected to the rod end of one cylinder 23, and the other end is connected to the rod end of the other cylinder (not shown). Therefore, by expanding and contracting these two cylinders 23 in opposite directions, the chain 22 is drawn into one cylinder 23 side or the other cylinder side, and the sprocket 21 rotates corresponding to this drawing amount, The turning post 2 turns accordingly. That is, the turning amount of the turning post 2 is determined by these cylinders 23.
It will be determined by the expansion and contraction stroke of.

Reference numeral 4 in FIG. 2 is an outrigger provided on each of the front and rear sides of the vehicle body 1.

In this example, the bucket 6 is pivotally supported by the horizontal shaft 62 at the tip of the boom 3, and the swing (pivoting) on the horizontal plane is not allowed. However, the bucket 6 is not limited to this. It is also possible to provide 6 on the boom 3 so that it can swing freely.

(Effects of the Invention) As described above, according to the present invention, the bucket is arranged substantially parallel to one side of the tip end portion of the boom, and the tip end of the boom is provided on the rear surface of the bucket and is substantially centered on the bracket. A horizontal cylinder for supporting the bucket horizontally between the boom and the bucket, corresponding to the ups and downs of the boom, and connecting one end of the horizontal cylinder to the tip of the boom. By connecting the other end to the lower end of the bracket provided on the bucket,
Since the horizontal cylinder is arranged between the boom and the bucket vertically or slightly inclined from the vertical, the space required for mounting the horizontal cylinder can be reduced, and the area around the connecting portion between the boom and the bucket can be made compact. be able to. Further, since it is not necessary to incorporate a horizontal cylinder in the tip portion of the boom as in the conventional case, the expansion and contraction efficiency of the boom can be improved, and the structure is simple and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a plan view showing the entire structure of an aerial work vehicle, FIG. 2 is a side view of the same, FIG. 3 is a side view showing the mounting state of the horizontal cylinder and its surroundings, and FIG. It is a side view which shows an attachment state. 1 ... Car body, 2 ... Swivel post 3 ... Boom, 6 ... Bucket 7 ... Horizontal cylinder

Claims (1)

[Claims] 1. An aerial work vehicle in which a swivel post is rotatably mounted on a vehicle body, and a boom having a bucket at its tip end is provided on the swivel post so that the boom can extend and contract and can be raised and lowered. Is arranged substantially parallel to one side of the tip of the boom, and the tip of the boom is provided on the rear surface of the bucket and is pivotally supported by the substantially central portion of the bracket. Is provided with a horizontal cylinder that holds the bucket horizontally, and the horizontal cylinder has one end connected to the tip of the boom and the other end attached to the lower end of the bracket provided on the bucket. A bucket horizontal holding device for an aerial work vehicle, characterized in that the bucket horizontal holding device is connected between the boom and the bucket and is arranged vertically or slightly inclined from the vertical.