JPH10167684A - Auxiliary boom swing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a large moment from acting on a vertical post in the tilting or recovering direction. SOLUTION: A vertical post 25 which maintains its vertical state regardless of the elevating angle of an elevating boom 23 is arranged at the top end part of the boom 23 which is arranged movably in the elevating and lowering directions, and a swing am 10 is arranged rotatably in the horizontal direction to the vertical post 25. Also an auxiliary boom 30 is arranged rotatably in the horizontal direction to the swing arm 10. In addition, the auxiliary boom 30 is maintained always at a right angle to the elevating boom 23 regardless of the swing angle of the swing arm 10 by providing an auxiliary boom swing means which rotates the auxiliary boom 30 in the direction reverse to the swing direction of the swing arm 10 to the swing arm 10 according to the swing action of the swing arm 10 relative to the vertical post 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub-boom turning device for turning a sub-boom attached to the tip of an up-and-down boom. About.

[0002]

2. Description of the Related Art In an aerial work vehicle as described above, as shown in FIGS. 5 and 6, a tip of an up-and-down boom 23 which can freely move up and down is controlled by an angle of the up-and-down boom 23. In addition, a vertical post 25 that always maintains a vertical state is provided, and a work table 24 configured to allow an operator to ride on the vertical post 25 is disposed so as to be horizontally pivotable. In addition, a sub boom 30 is attached to the upper part of the vertical post 25 so that a hanging wire W is hung from the tip end so that work equipment and the like can be hung.

[0003] The sub-boom 30 improves the approachability of the hoisted equipment to the work table 24 and the work table 2
The swing arm 40 is provided at the tip of a swing arm 40 that is horizontally swingable with respect to the vertical post 25 so that the apparatus can be lifted even at a position away from the vertical post 25.

The vertical post 25 is moved in the front-rear direction (see FIG. 6) by a pivot pin 23a disposed at the tip of the up-and-down boom 23.
Swing in the left and right directions).
Further below the pivot position of the pivot pin 23a,
The rod-side end of the leveling cylinder 26 is connected. The bottom end of the leveling cylinder 26 is connected to the undulating boom 23.
The vertical post 25 swings by performing the telescopic operation of 6. Therefore, by performing the expansion / contraction operation of the leveling cylinder 26 in response to the up / down operation of the up / down boom 23, the vertical post 25 can always be maintained in a vertical state regardless of the up / down angle of the up / down boom 23.

[0005] When the equipment is lifted by the sub-boom 30, the sub-boom 30 is positioned so as to be perpendicular to the up-and-down boom 23 in a plan view, as shown by a chain line in FIG. However, since the swing arm 40 is configured to be horizontally swingable with respect to the vertical post 25, the swing arm 4 is moved from the state shown by the chain line in FIG.
When only 0 is turned, the tip of the sub-boom 30 faces in the same direction as the direction in which the up-and-down boom 23 extends, as shown by the solid line in FIG.

[0006]

In such a state, the sub-boom 30 is positioned away from the up-and-down boom 23 by the length of the turning arm 40.
It is possible to lift the device using the hook F provided at the end of the wire W without interfering with the device. Then, when the lifting is performed as it is, a moment acts in a direction indicated by an arrow M, and a force acts to tilt the vertical post 25 toward the up-and-down boom 23. When such a force acts, a force in the direction of extending the rod (pulling the rod) acts on the leveling cylinder 26,
There is a problem that the leveling cylinder 26 may be adversely affected.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a sub-boom turning device that does not exert a large moment in a direction in which a vertical post is laid down.

[0008]

In order to achieve the above object, a sub-boom swivel device according to the present invention is provided at the tip of the up-and-down boom which can be freely raised and lowered on a base. A vertical post that maintains the vertical state regardless of the undulation angle is arranged, and a turning arm is arranged on the vertical post so that it can be turned horizontally, and a sub boom is arranged on this turning arm so that it can be turned horizontally. I have. Furthermore, by providing a sub-boom turning means for rotating the sub-boom with respect to the turning arm in a direction opposite to the turning direction of the turning arm, in response to the turning operation of the turning arm with respect to the vertical post,
The sub-boom is always maintained at a predetermined angle with respect to the up-and-down boom regardless of the swing angle of the swing arm.

According to the sub-boom swivel device configured as described above, since the sub-boom turns in the direction opposite to the turning direction of the turning arm, the extending direction of the sub-boom can always be maintained in a constant direction. If the predetermined angle of the sub-boom with respect to the undulating boom, which is the direction in which the sub-boom extends, is set to an angle of about 90 °, the undulating boom and the sub-boom will not be parallel in plan view (they may extend in the same direction). Therefore, even when a load is applied to the tip of the sub-boom, such as when lifting using the sub-boom, a large moment does not act in the direction in which the vertical post falls down.

The sub-boom turning means includes a first gear fixed to the vertical post, a reversing gear rotatably disposed on the revolving arm in mesh with the first gear, and meshing with the reversing gear. The second gear, which is rotatably disposed on the turning arm and has the sub-boom fixed thereto, meshes with the first gear and rotates by receiving the driving force of the driving means disposed on the turning arm. And a drive gear for causing the pivot arm to pivot with respect to the vertical post.

With such a configuration, when the driving gear is rotated by the driving means, the turning arm performs a turning operation with respect to the vertical post, and the sub-boom turns in a direction opposite to the turning direction of the turning arm. Therefore, the sub-boom can be reliably maintained at a predetermined angle with respect to the undulating boom with a simple configuration.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, an aerial work vehicle equipped with a sub-boom turning device according to the present invention will be described with reference to FIG. At the rear of the vehicle body 21 of the aerial work vehicle 20, a telescopic (nested) telescopic up-and-down boom 23 composed of a plurality of boom members is provided.
Is mounted on a swivel base 22 that can swivel with respect to the vehicle body 21 so as to be able to move up and down.

As shown in FIGS. 1 and 3, a vertical post 25 which is always maintained in a vertical state by a leveling cylinder 26 is provided at the tip of the hoisting boom 23. The mounting structure of the vertical post 25 and the leveling cylinder 26 at the distal end of the up-and-down boom 23 is the same as the structure shown in FIGS. 5 and 6, and thus the same reference numerals are given and the description thereof will not be repeated. .

The vertical post 25 has a workbench support member 24
The work table 24 is disposed so as to swing freely in the horizontal direction via a. The first spur gear 11 is fixed above the workbench support member 24 a and at the upper end of the vertical post 25. Further, the vertical post 25 has
A swivel arm 10 configured to be horizontally swivelable is provided.

As shown in FIG. 4, the revolving arm 10 is an idler gear (reverse gear) that meshes with the first spur gear 11.
13 and the second spur gear 12 meshing with the idler gear 13 are rotatably provided. The second spur gear 12 has
A tip shaft 17 to which a sub-boom 30 described later is attached is fixed. The first spur gear 11 and the second spur gear 12 are gears having the same number of teeth. 14 mesh.

A sub-boom 30 is attached to the upper end of the tip shaft 17 of the turning arm 10 thus configured. The sub boom 30 includes a boom holding member 31 attached to the distal end shaft 17 and a boom holding member 3.
1 and a boom holding member 3
A sub-boom main body 33 which is held at 1 and extends outward, and a sheave 34 which is disposed at a tip end of the sub-boom main body 33.
It is composed of

The boom holding member 31 is configured to be horizontally pivotable with respect to the distal end shaft 17, and the locking portion between the boom holding member 31 and the distal end shaft 17 has a structure shown in FIG.
At the position indicated by the solid line and the chain line in FIG.
3 is provided with a stopper (not shown) capable of holding the sub-boom at a position perpendicular thereto (a predetermined angle with respect to the up-and-down boom of the sub-boom).

In the aerial work vehicle 20 thus constructed, the workbench 24 can be moved to a desired height by raising and lowering the up-and-down boom 23. When lifting the equipment placed on the ground near the work table 24, as shown in FIGS. 1A and 2, the swing arm 10 is moved backward (in the same direction as the direction in which the hoisting boom 23 extends). Swivel and sub boom 3
The wire W is held at a position extending in a direction perpendicular to the up-and-down boom 23, and the wire W is fed out and wound up by the winch 32, so that the wire W is lifted to a desired position.

When the lifting is performed in such a state, a large force that causes the vertical post 25 to fall backward does not act, so that the leveling cylinder 26 is not adversely affected. In the state where the turning arm 10 is turned backward and the sub-boom 30 is positioned so as to extend in a direction perpendicular to the up-and-down boom 23, the gears 11 to 14 move inside the turning arm 10 as shown in FIG. ).

Then, as shown in FIG. 1B, the swivel arm 1 moves the sub-boom 30 closer to the work table 24.
When turning 0 in a direction perpendicular to the up-and-down boom 23, the drive gear 14 is rotated clockwise from the state shown in FIG. Thus, the idler gear 13 also rotates around the outer periphery of the first spur gear 11 while rotating clockwise, and
2 rotates left. The rotation of each of the gears 11 to 14 causes the vertical post 25 to rotate as shown in FIG.
The turning arm 10 turns right around the center.

Here, as shown in FIG.
Assuming that points S, S are given above the first and second spur gears 12, the first spur gear 11 and the second spur gear 12 have the same number of teeth. Gear 1
The points S 1 and S 12 are always located above.
Therefore, if the direction in which the point S is given on the second spur gear 12 is the direction in which the sub-boom 30 is facing, regardless of the horizontal turning angle of the turning arm 10, the sub-boom 3
0 can always be positioned so as to extend in a direction perpendicular to the direction in which the hoisting boom 23 extends.

According to the aerial work vehicle 20 configured as described above, the sub-boom 30 provided at the tip of the up-and-down boom 23 is disposed via the swivel arm 10.
The approachability of the lifted device to the work table 24 is improved (the workability at the foot is improved), and the work table 2 is improved.
The lifting operation of the device at a position away from the device 4 can be easily performed. Further, even when the horizontal swing operation of the swing arm 10 is performed, the sub-boom 30 is not positioned parallel to the up-and-down boom 23, so that the moment indicated by the arrow M in FIG. Is not applied.

Further, as shown in FIGS. 1A and 3, when the turning arm 10 is turned in the same direction as the direction in which the hoisting boom 23 extends, nothing is positioned above the vertical post 25. . For this reason, a working device 50 such as a magic hand (manipulator arm) can be provided above the revolving arm 10, which is the upper end of the vertical post 25, as shown by a chain line.

In the aerial work vehicle 20 described above,
The sub-boom swiveling means includes the first spur gear 11 and the second spur gear 1
2, the idler gear 13, the drive gear 14, and the drive motor 15 are provided, but the present invention is not necessarily limited to such a structure. For example, the configuration may be such that the idler gear 13 is driven, or the turning operation of the turning arm 10 is manually performed without providing the drive pinion 14 and the drive motor 15.

Further, in the aerial work vehicle 20 described above,
The predetermined angle of the sub-boom 30 with respect to the undulating boom 23,
Although the case where the angle is perpendicular to the up-and-down boom 23 has been described, in the present invention, the predetermined angle is not necessarily required to be a right angle. That is, as long as a large moment does not act in the direction in which the vertical post 25 falls down, an angle (eg, 80 °) slightly turned from a right angle may be used.
That is, the number of teeth of the gears corresponding to the first spur gear 11 and the second spur gear 12 may be slightly different.

[0026]

As described above, according to the sub-boom turning device of the present invention, the sub-boom turning means reverses the turning direction of the sub-boom with respect to the turning arm in response to the turning operation of the turning arm with respect to the vertical post. By rotating in the direction, the sub-boom can be maintained at a predetermined angle such as a right angle with respect to the up-and-down boom, regardless of the swing angle of the swing arm.

For this reason, the sub-boom is not swiveled such that the sub-boom and the up-and-down boom are lined up in a plan view, and the sub-boom is lifted by the sub-boom so as to generate a moment in the direction of tilting the vertical post. Absent. Therefore, there is no adverse effect on the mechanism for maintaining the vertical post always vertical.

Further, the sub-boom turning means may be constituted by a gear fixed to the vertical post or the sub-boom, a reverse gear meshing with these gears, and a drive gear for turning the turning arm about the vertical post. Preferably, with such a configuration, the sub-boom can be easily and reliably turned in the direction opposite to the turning direction of the turning arm.

[Brief description of the drawings]

FIG. 1 is a plan view of a sub-boom turning device according to the present invention.

FIG. 2 is a side view of an aerial work vehicle equipped with the sub-boom turning device.

FIG. 3 is a side view of the sub-boom turning device.

FIG. 4 is a cross-sectional view of the sub-boom swivel device taken along line IV- in FIG.
It is IV sectional drawing.

FIG. 5 is a plan view showing an operation state of a conventional sub-boom turning device.

FIG. 6 is a side view of the sub-boom turning device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 swivel arm 20 aerial work platform 23 undulating boom 24 workbench 25 vertical post 30 sub boom

Claims (2)

[Claims] An up-and-down boom arbitrarily disposed on a base, and a vertical boom disposed at a tip of the up-and-down boom to maintain a vertical state regardless of the up-down angle of the up-and-down boom. A post, a swivel arm horizontally rotatably arranged on the vertical post, a sub-boom arranged horizontally horizontally on the swivel arm, and a swivel operation of the swivel arm with respect to the vertical post. A sub-boom that rotates the sub-boom with respect to a swing arm in a direction opposite to a swing direction of the swing arm, thereby always maintaining the sub-boom at a predetermined angle with respect to the undulating boom regardless of a swing angle of the swing arm. A sub-boom turning device comprising turning means. 2. A sub-boom pivoting means comprising: a first gear fixed to the vertical post; a reverse gear meshed with the first gear and rotatably disposed on the pivot arm; A second gear meshed with the gear and rotatably disposed on the swing arm, to which the sub-boom is fixed, and receiving a driving force of a driving means meshed with the first gear and arranged on the swing arm. The sub-boom turning device according to claim 1, further comprising a drive gear that rotates by rotating the turning arm with respect to the vertical post.