JPH0114636Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a bucket swing drive device for boarding a worker in an aerial work vehicle.

(Prior Art) As shown in FIG. 3, an aerial work vehicle has an arm 1 attached to a vehicle (not shown) so as to be able to freely rotate and adjust the elevation. The posture maintenance device is attached via a horizontal support shaft 2 orthogonal to the horizontal support shaft 2 and is driven around the horizontal support shaft in relation to the up-and-down movement of the arm 1 so as to always maintain a constant ground attitude regardless of the up-and-down movement of the arm 1. A member 3, a bearing member 5 externally fitted on a vertical shaft 4 provided on the attitude maintaining member 3 so as to be horizontally rotatable, and a bucket 6 for riding a worker attached to the bearing member 5. Then, by driving the arm 1 up and down (extending drive if the arm 1 is telescopic, and bending and stretching drive if the arm 1 is bendable), driving the arm 1 to swing, and driving the bucket 6 to swing, The bucket cart 6 is brought to a desired position, and a worker riding on the bucket cart performs desired work at a high place. In FIG. 3, 7 is a hydraulic cylinder that drives the posture maintaining member 3 around the horizontal support shaft 2 so that the vertical axis 5 of the posture maintaining member 3 always maintains a vertical posture regardless of the up-and-down movement of the arm 1. This hydraulic cylinder 7 is interposed between the arm 1 and the posture maintaining member 3 at a proper position, and is connected to a hydraulic cylinder (not shown) that is driven in conjunction with the raising and lowering movement of the arm 1 to maintain the posture. The member 3 is controlled as described above.

Reference numeral 8 denotes a bucket cart turning drive device for horizontally driving the bucket cart 6 to swing around the vertical axis 4. The conventional swing drive device 8 is shown in FIGS. 3 and 4.
As shown in the figure, a worm wheel 9 fixedly arranged on the vertical shaft 4, a worm 10 meshing with the worm wheel 9 and rotatably supported at both ends on the bearing member 5 side, and a worm 10 for rotationally driving the worm 10. It consists of a handle 11.
The bucket swing drive device 8 configured in this way is
When a worker on board the bucket 6 rotates the handle 11, the worm 10 revolves around the worm wheel 9.
The bearing member rotatably supporting the 0 and the bucket bag 6 attached to the bearing member 5 are rotated around the vertical shaft 4.

(Problems to be Solved by the Present Invention) The conventional bucket swing drive device 8 for an aerial work vehicle as described above, that is, the bucket swing drive device using a so-called worm reducer can obtain a large reduction ratio. Bucket 6 with a small force
Although it has the effect of being able to swing and drive, it has the following drawbacks. That is, in the worm reducer, it is difficult to ensure a large meshing area between the worm 10 and the worm wheel 9. (The meshing area between the worm wheel 9 and the worm 10 can be increased by increasing the diameter and thickness of the worm wheel 9, but in this case, the weight of the worm reducer, that is, the swing drive device 8) (This is undesirable because it increases the weight of the tip of the arm 1 and lowers the height of the aerial work vehicle.) Therefore, the surface pressure at the meshing part of the worm wheel 9 and the worm 10 is high, causing wear of the worm wheels 9 and 10. The disadvantage is that the worm gear reducer or swivel drive 8 has to be frequently replaced or adjusted.

The present invention aims to provide a novel bucket swing drive device for an aerial work vehicle that eliminates the above-mentioned drawbacks of the conventional bucket swing drive device for an aerial work vehicle.

(Means for Solving the Problems) The present invention is constructed as follows in order to solve the drawbacks of the above-mentioned prior art. That is, the bucket swing drive device for the aerial work vehicle of the present invention has the posture maintaining member 3.
a drum fixedly disposed on the posture maintaining member 3 so as to be located on the same axis as the axis of the vertical shaft 4 of the drum, and a screw rotatably attached to the bearing member 5 and having an axis parallel to a plane perpendicular to the axis of the drum. A threaded rod that is a rod and is arranged so that its threaded portion crosses a position close to the outer peripheral surface of the drum, a handle or a motor for rotating the threaded rod, a threaded cylinder screwed into the threaded rod, and the screw. A chain or rope that has one end fixed to one end of the tube, and is wound around the drum from there toward the other end of the screw tube, and the other end is fixed to the drum, and one end of the rope is fixed to the other end of the screw tube. consisting of a chain or rope that is fastened to the drum and wound around the drum from there toward one end of the threaded cylinder, and the other end is fastened to the drum;
At least one chain or rope of the pair of chains or ropes is fixed at a threaded tube-side fastening part or a drum-side fastening part so that the tension can be adjusted freely.

(Function) In the bucket swing drive device for an aerial work vehicle of the present invention configured as described above, the threaded position of the threaded rod in the threaded cylinder is changed by rotating the threaded rod using the handle or the motor. On the other hand, the screw tube has a vertical axis 4
Since the position is determined by a pair of chains or ropes on the drum fixed to the drum, changing the screwing position of the threaded rod into the threaded cylinder causes the threaded rod to revolve relative to the drum. The revolution of the threaded rod on the drum is achieved by attaching the threaded rod rotatably to the bearing member 5.
is rotated around the vertical axis 4 of the posture maintaining member 3,
This is for rotating a bucket 6 attached to a bearing member 5. This swing drive device swings the bucket 6 by pulling a pair of chains or ropes wound around a drum by the movement of a threaded cylinder that occurs as the threaded rod rotates. A desired reduction ratio can be obtained by appropriately setting the thread pitch of the threaded rod. In particular, according to the configuration of the present invention, since the threaded cylinder meshes with the threaded rod around the entire circumference, the meshing area can be increased to reduce the surface pressure of the meshing part, and the wear of the meshing part can be kept low. It is possible.

(Embodiment) An embodiment of the bucket swing drive device for an aerial work vehicle according to the present invention will be described based on FIG. 1 and FIG. 2. The tip structure of the arm 1 of the aerial work vehicle described as the prior art shown in FIGS. 3 and 4 is the same structure in the embodiment of the present invention described below, except for the structure of the swing drive device 8. Therefore, the third
Reference numerals 1 to 7 shown in FIGS. 4 and 4 and explained as the prior art and their explanations will be used as they are in the following explanation.

In FIGS. 1 and 2, reference numeral 12 represents a bucket swing drive device according to the present invention. This swing drive device 12 includes a drum 13 that is fixedly arranged on the attitude maintaining member 3 so as to be located on the same axis as the axis of the vertical shaft 4 of the attitude maintaining member 3, and a drum 13 that is rotatably attached to a bearing member 5. A threaded rod 14 having an axis parallel to a plane perpendicular to the axis of the drum 13 and arranged so that its threaded portion 15 crosses a position close to the outer peripheral surface of the drum 13, and rotating the threaded rod 14. A handle 16 attached to one end of a threaded rod 14 for the purpose of
4, one end of which is fixed to a bracket 18 provided at one end of the threaded barrel 17, and the other end is wound around the drum 13 toward the other end of the threaded barrel 17. A chain 20 is fixed to a bracket 19 provided at the threaded cylinder 13, and one end thereof is fixed to a bracket 21 provided at the other end of the threaded cylinder 17, and the chain 20 is wound around the drum 13 from there toward one end of the threaded cylinder 17. The other end of the chain 23 is fixed to a bracket 22 provided on the drum 13. The chain 20
The other end is fastened to the drum 13 by inserting a bolt 24 connected to the other end of the chain 20 through the bracket 19, and then screwing a nut 25 into the insertion end of the bolt 24. 20 so that the tension can be adjusted. The other end of the chain 23 is also attached to the drum 13 at the other end of the chain 23.
0 has the same structure as the attachment part to the drum 13 at the other end. and chain 20 and chain 2
3 is kept under sufficient tension by tightening the nut 25. In addition, 26 is a guide provided so as to be slidably engaged with the back surface of the threaded cylinder 17 (the side opposite to the drum 13).

Next, the action will be explained. When the bucket cart 6 is to be turned around the vertical axis 4 of the posture maintaining member 3, a worker riding on the bucket cart 6 operates the handle 16 of the swing drive device 12 to rotate the threaded rod 14. When the threaded rod 14 rotates, the screwing position of the threaded rod 14 into the threaded cylinder 17 changes.
The threaded cylinder 17 connects a pair of chains 20 and 23 to a drum 13 fixed to the vertical shaft 4 of the posture maintaining member 3.
Since the position is determined by
By changing the screwing position of the threaded rod 14 relative to 7,
A threaded rod 14 revolves around the drum 13. The revolution of the threaded rod 14 with respect to the drum 13 is the rotation of the threaded rod 14 with respect to the drum 13.
The bearing member 5 to which the bearing member 5 is rotatably attached is rotated around the vertical shaft 4. In this way, the bucket 6 attached to the bearing member 5 is driven to rotate.

In the above embodiment, the threaded rod 14 is rotated by the handle 16, but the threaded rod may of course be rotated by a motor such as a hydraulic motor or an electric motor.

Furthermore, it goes without saying that the chains 20 and 23 in the above embodiment may be replaced with ropes.

Further, in the above embodiment, the chains 20 and 23 can be tensioned at their ends on the side of the drum 13 by the bolts 24 and nuts 25, but when one of the chains 20 and 23 is tensioned, the other is also tensioned. It goes without saying that one of the tension means consisting of the bolt 24 and nut 25 may be omitted because the tension is applied accordingly. Further, it goes without saying that the tensioning means consisting of the bolt 24 and the nut 25 may be provided at the ends of the chains 20 and 23 on the threaded cylinder side.

(Effects) The bucket swing drive device for an aerial work vehicle of the present invention, configured and operated as described above, has a simple structure and can obtain a large reduction ratio.
Since the threaded cylinder 17 is engaged with the threaded rod around the entire circumference of the threaded rod, the engagement area can be greatly increased compared to the engagement area between the worm wheel and the worm in a conventional worm reducer type swing drive device. As a result, it is possible to reduce the surface pressure of the meshing portion and reduce the wear thereof. Therefore, according to the present invention, it is possible to obtain a bucket swing drive device for an aerial work vehicle that has a simple structure, has a large reduction ratio, and has a long life.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a bucket swing drive device for an aerial work vehicle according to the present invention, and Figure 2 is an illustration of the X-X in Figure 1.
It is an enlarged cross-sectional view. FIG. 3 is an explanatory diagram of a conventional bucket swing drive device for an aerial work vehicle, and FIG. 4 is an enlarged cross-sectional view taken along the Y-Y line in FIG. 3. Arm...1, Horizontal support shaft...2, Posture maintenance member...3, Vertical shaft...4, Bearing member...5, Bucket...6, Drum...13, Threaded rod...14, Threaded part... ...15, Handle...16, Chain...
20, 23.

Claims (1)

[Scope of utility model registration request] An arm that is attached to a vehicle so that it can be freely adjusted for turning and raising and lowering, and is attached to the tip of the arm via a horizontal support shaft that is perpendicular to the plane of the arm's raising and lowering trajectory, and that always maintains a constant ground posture regardless of the raising and lowering movements of the arm. a posture maintaining member that pivots about the horizontal support shaft in relation to the up-and-down movement of the arm, a bearing member fitted externally to a vertical shaft provided on the posture maintaining member so as to be horizontally rotatable, and the bearing member A bucket belt swing drive device for an aerial work vehicle, comprising a bucket belt for a worker to board, which is fixed to the posture maintaining member so as to be located on the same axis as the vertical axis of the posture maintaining member. a threaded rod that is rotatably attached to the bearing member and has an axis parallel to a plane perpendicular to the axis of the drum, the threaded portion of which is arranged to cross a position close to the outer peripheral surface of the drum; a threaded rod, a handle or motor for rotating the threaded rod, a threaded cylinder screwed into the threaded rod, one end of which is fixed to one end of the threaded cylinder, and the threaded cylinder extends from there toward the other end. A chain or rope that is wound around the drum and has its other end fixed to the drum; and a chain or rope that has one end fixed to the other end of the threaded tube and is wound around the drum from there toward one end of the threaded tube. and a chain or rope fixed to the drum, and at least one chain or rope of the pair of chains or ropes is fixed in a tension-adjustable manner at a threaded cylinder side fastening part or a drum side fastening part. A bucket swing drive device for an aerial work vehicle, characterized by: