JPH10129990A - Lifting device of high lift working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow to avoid the interference with a working board in the using time, while to prevent to disturb the other works in the non-using time. SOLUTION: While an undulating arm 12 is pivoted allowable to undulate to a rotary board 11, an extension boom 13 is pivoted to the tip of the undulating arm 12, and an extension cylinder 16 is provided between the undulating arm 12 and the extension boom 13. When a lifting device 10 is used, the extension boom 13 is extended and contracted at a little upper side than the horizontal direction by extending the extension cylinder 16 as well as erecting the undulating arm 12, and thereby, the interference between the extension boom 13 and a working board 7 is avoided. On the other hand, when the lifting device 10 is not used, the undulating arm 12 is made fall down to the outer side, and the extension boom 13 is superposed on the undulating arm 1 in the contracting condition, and stored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device mounted on a boom tip of an aerial work vehicle for lifting construction members and the like on a work table.

[0002]

2. Description of the Related Art In an aerial work vehicle having a lifting device,
A boom is provided on the vehicle body so that the vehicle can freely turn, undulate, expand and contract, and the like. At the tip of the boom is provided a vertical post which is always held vertically by a leveling mechanism, and a worktable for an operator is swingably mounted (horizontal rotation) on the vertical post. The lifting device is mounted on top of this vertical post. This type of hoisting device has a swivel that is pivotally attached to the tip of a vertical post, a winch bracket that is attached to the swivel so that it can be raised and lowered, and a crane arm that is supported by the winch bracket. I have. A winch for winding and unwinding the rope is provided in the winch bracket.

In this high-altitude work vehicle, the work is performed by operating a boom to move a work table to a desired high place. Then, in such a high place, the operator can operate the winch to lift or lower a construction member or the like hung on the hook at the end of the rope from the ground.

By the way, depending on the contents of the work, it may be necessary to move the work table in the vertical direction. In this case, it is difficult to move the workbench vertically by performing a combined operation of raising and lowering the boom and extending and retracting the boom. For this reason, some aerial work vehicles have a structure in which the worktable can be moved up and down with respect to the vertical post. According to such a structure, the worktable can be moved in the vertical direction without requiring skill. . Depending on the type of work, the workbench may be required to be vertical even in an aerial work vehicle equipped with a lifting device, so that the workbench can be moved vertically even in an aerial work vehicle equipped with a lifting device. It is desired to have a configuration.

[0005]

However, in the lifting device having the above-described structure, the crane arm is supported by the winch bracket above the vertical post. Therefore, there is a problem that when the work table is moved upward, the work table may interfere with the crane arm. A method of avoiding interference by extending the winch bracket upward and disposing the crane arm above may be considered, but in this case, when the lifting device is not used, the crane arm interferes with other work. Occurs.

In order to prevent this interference, a method of attaching a lifting device to a work table is conceivable. However, the work table is made of resin or the like, and a heavy object is lifted by the lifting device. In this case, the lifting device cannot be attached to the work table because the work table to which the lifting device is attached is not strong enough.

[0007] The present invention has been made in view of such a problem, and when the lifting device is used, interference between the lifting device and the worktable can be avoided, and when the lifting device is not used. It is an object of the present invention to provide a lifting device for an aerial work vehicle capable of preventing the work from interfering with other work.

[0008]

In order to achieve the above-mentioned object, a lifting device according to the present invention comprises a main boom arbitrarily disposed on a vehicle body such as an up-and-down operation, and a main boom provided at a tip end of the main boom. A lifting device for an aerial work vehicle, comprising: a vertical post which is always vertically held via a leveling mechanism and is attached thereto; and a worktable which is attached to the vertical post so as to freely swing (horizontally swing) in a horizontal direction. A winch arranged near the vertical post for winding and unwinding the rope, an up / down arm mounted on the upper end of the vertical post so as to be able to undulate, and a winch attached to the tip of the undulated arm so as to be able to bend and extend. And a sub-boom provided with a sheave for changing the direction of a rope extending from the sheave and guiding it downward.

In the lifting device of the present invention thus constructed, the work table is raised when the work table is configured to be able to move up and down by raising and lowering the up-and-down arm and bending the sub-boom at the time of work. Even when the sub boom is at the uppermost position, it is preferable to position the sub boom at a position that avoids interference with the upper part of the work table. On the other hand, when the lifting device is not working, it is preferable that the undulating arm be lowered outward and the sub-boom be stored on the undulating arm.

Thus, when the lifting device is used, interference between the sub-boom and the work table can be avoided, and when the lifting device is not used, the sub-boom can be arranged at a position where it does not interfere with other operations.

Further, the up-and-down arm may be constituted by two parallel link members of the same length extending in parallel with one end pivotally connected to the sub-boom and the other end pivotally connected to the tip of the main boom. . According to such a configuration,
The posture of the sub-boom can always be kept the same regardless of the angle of the undulating arm.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. First, an aerial work vehicle having the lifting device of the present invention will be described with reference to FIG. This aerial work vehicle has a turntable 2 that can turn freely on a vehicle body 1, and a main boom 3 is attached to the turntable 2 so as to be able to move up and down. The main boom 3 includes a telescopic base boom 3a, an intermediate boom 3b, and a distal boom 3c, which are telescopically movable. The base boom 3a is pivotally supported by the swivel base 2 via the support shaft 2a so as to be freely raised and lowered. I have. The main boom 3 is extended and contracted by a telescopic cylinder (not shown) provided therein, and is raised and lowered by a raising and lowering cylinder 4 disposed between the swivel 2 and the base end boom 3a.

A vertical post 6 is pivotally supported by a pin 3d at the distal end of the distal end boom 3c so as to swing up and down. The vertical post 6 is provided with leveling mechanisms 5a and 5b.
It is designed to be always vertical via. A pair of brackets 7a and 7b of a worktable 7 are rotatably attached to the vertical post 6, respectively.
A worktable 7 is attached to the other end of 7b. An elevating device 7c (the internal configuration is not shown) is provided between the brackets 7a and 7b.
It can be moved up and down by c. A lifting device 10 is provided above the vertical post 6.

FIG. 1 shows the lifting device 10 mounted on a vertical post 6.
A description will be given with reference to FIG. The lifting device 10 includes a turning member 11 provided on the vertical post 6 so as to be turnable,
The swing arm 11 has a lower end pivotally supported so as to be able to move up and down, and an up and down arm 12 and a winch 1 arranged beside the vertical post 6.
And an undulating arm is provided by undulating means (not shown).
It is possible to make the undulation easier. A telescopic boom (sub-boom) 13 is pivotally supported at the upper end of the raising / lowering arm 12, and a telescopic cylinder 16 is provided between the raising / lowering arm 12 and the telescopic boom 13. The telescopic boom 13 is raised and lowered by the operation of the telescopic cylinder 16. The arm 12 is freely bendable and extendable.

The telescopic boom 13 comprises a base end boom 13a and a distal end boom 13b, which are telescopically configured to be extendable and retractable. These telescopic booms 13 are telescopically operated by a telescopic cylinder (not shown) in the telescopic boom 13. It has become. The length of the up-and-down arm 12 is set to a length that can avoid interference between the telescopic boom and the upper part of the worktable when the worktable 7 is moved up to the uppermost position when the lifting device 10 is used. (Details will be described later).

Sheaves 13c and 13d are provided at the proximal end of the proximal telescopic boom 13a and the distal end of the distal boom 13b. The winch 14 is provided with a winch drum 14a, and the rotation of the winch drum 14a allows the wire 14w to be wound and fed out.
The tip of the 4w hangs downward from the tip of the tip boom via the sheaves 13c and 13d. In addition,
A hook 15 is connected to the tip of the wire 14w.

The lifting device 10 constructed as described above
Then, as shown in FIG. 1 (A), the erecting arm 12 is raised vertically, and the telescopic cylinder 16 is extended to bend and extend the telescopic boom 13 slightly above the horizontal, and the telescopic boom 13 is further extended. Lifting work is performed. In this state, the worker can hang a lifted object (not shown) such as a member for construction on the hook 15 and operate the winch 14 to raise and lower the lifted object. When performing such work, when it is necessary to move the work position upward, the worker moves the work table 7 upward, and the work table 7 moves to the maximum position indicated by the dashed line at the maximum.

Even if the worktable 7 moves to the uppermost position, the up-and-down arm 12 has a sufficient length, so that the telescopic boom 13 does not interfere with the upper part of the worktable 7. Further, since the telescopic boom 13 is bent slightly upward from the horizontal, an operator who is on the work table can easily attach and detach the object to be suspended to and from the hook.

When the lifting device 10 completes the operation, as shown in FIG. 1B, the telescopic boom 13 is contracted, the undulating arm 12 is lowered outward, and the telescopic cylinder 16 is moved downward. Shrinkable telescopic boom 13
Are placed on the undulating arm 12 to be in the retracted state. In such a stored state, the lifting device 10
Will not interfere with other tasks.

The distal end of the piston of the telescopic cylinder 16 may not be directly connected to the proximal boom 13a. FIG.
, The distal end of the piston of the telescopic cylinder 16
The configuration of the lifting device 20 not directly connected to 3a is shown. As shown in FIG. 2, in the lifting device 20, the tip of the piston of the telescopic cylinder 16 is
One end is connected to the other end of each of the connection links 21 and 21 connected to the base end boom 13a and the undulating arm 12, respectively.
In addition, about the other structure of the lifting apparatus 20, the same member is attached | subjected with the same number, and description is abbreviate | omitted.

In the lifting device 20 having such a configuration, similarly to the lifting device 10 of FIG. 1, interference between the telescopic boom 13 and the worktable 7 can be avoided in the use state shown in FIG. 2A. Then, when the work is completed, FIG.
As shown in FIG. 3, the telescopic boom 13 is contracted, the undulating arm 12 is lowered outward, and
6 can be contracted and the telescopic boom 13 can be placed in a state of being placed over the undulating arm 12.

The up-and-down arm on which the telescopic boom 13 is pivotally supported may be a parallel link mechanism instead of a single up-and-down arm 12 as shown in FIG. In FIG.
The structure of the lifting device 30 using a parallel link mechanism as the undulating arm is shown. In the lifting device 30, one end of each of two parallel link members 32 and 33 having the same length is pivotally connected to the base end boom 13 a of the telescopic boom 13. The other end of the parallel link member 32 is pivotally connected to the turning bracket 31, and the other end of the parallel link member 33 is connected to the connection link 3 which is connected to the turning bracket 31 at one end.
4 and connected to a telescopic cylinder 35 pivotally connected to the swing bracket 31. here,
The swivel bracket 31 is capable of swiveling on the vertical post 6 similarly to the swivel table 11 of FIG. In addition, about the other structure of the lifting apparatus 30, the same member is attached | subjected with the same number, and description is abbreviate | omitted.

In the lifting device 30 having such a configuration, similarly to the lifting device 10 of FIG. 1, in the use state shown in FIG. 3A, interference between the telescopic boom 13 and the worktable 7 can be avoided, and the parallel link can be avoided. By the mechanism, the telescopic boom 13 can be held in the same posture regardless of the undulating angle of the parallel link members 32 and 33. In the state shown in FIG. 3A, the telescopic boom 13 is held in a posture bent slightly upward from the horizontal.
5 by elongation. Then, when the work is completed, as shown in FIG. 3B, the telescopic boom 13 is contracted and the parallel link members 32 and 33 are laid down outward, and the telescopic cylinder 35 is contracted and the telescopic boom 13 is contracted. May be arranged beside the parallel link members 32, 33.

[0024]

As described above, the lifting device of the present invention includes the up-and-down arm attached to the tip of the vertical post and the sub-boom attached to the tip of the up-and-down arm so as to be able to undulate and extend. Therefore, even when the worktable is configured to be able to move up and down, interference between the worktable and the subboom can be avoided when the lifting device is used by raising and lowering the arm and bending and extending the sub-boom. In addition, the sub-boom can be placed at a position where the sub-boom does not interfere with other operations when the lifting device is not in use by folding the lifting arm outward and storing the sub-boom on the lifting arm. .

Further, each of the raising and lowering arms is constituted by two parallel link members having the same length and having one end pivotally connected to the sub-boom and the other end pivotally supported by the tip of the main boom and extending in parallel. Without using, the posture of the sub-boom can always be kept the same regardless of the angle of the undulating arm.

[Brief description of the drawings]

FIG. 1 is a side view showing a lifting device according to the present invention. FIG. 1 (A) shows a use state, and FIG. 1 (B) shows a non-use state.

FIG. 2 is a side view showing a lifting device according to a different embodiment of the present invention, wherein FIG. 2 (A) shows a use state and FIG. 2 (B) shows a non-use state.

FIG. 3 is a side view showing a lifting device according to a third embodiment of the present invention, where FIG. 3A shows a use state and FIG. 3B shows a non-use state.

FIG. 4 is a side view showing a configuration of an aerial work vehicle equipped with the lifting device of the present invention.

[Explanation of symbols]

 12 Undulating arm 13 Telescopic boom 14 Winch 16 Telescopic cylinder 32, 33 Parallel link member

Claims (3)

[Claims] 1. A main boom arbitrarily disposed on a vehicle body such as an up-and-down operation, a vertical post constantly held and attached to a distal end of the main boom via a leveling mechanism, and A lifting device for an aerial work vehicle having a work table horizontally swingably mounted on a post, and a winch disposed near the vertical post and wound around a rope, for feeding out, An up-and-down arm attached to the upper end of the vertical post so as to be able to move up and down, and a sheave attached to the tip of the up-and-down arm so as to be able to bend and extend with respect to the up-and-down arm and changing a direction of a rope extending from the winch and guiding it downward A lifting device for an aerial work vehicle, comprising a sub-boom. 2. The work table is configured to be able to move up and down on the vertical post. During the operation of the lifting device, the raising and lowering arm is raised and the sub-boom is bent and extended, so that the work table is moved up and down. Position the sub-boom at a position where it does not interfere with the upper part of the work table, and when the lifting device is not in operation, the undulating arm is lowered outward, and the sub-boom is laid on the undulating arm. The lifting device for an aerial work vehicle according to claim 1, wherein the lifting device is configured to be stored. 3. The undulating arm comprises two parallel link members of the same length, one end of which is connected to the sub-boom and the other end of which is connected to the tip of the main boom and extends in parallel. The lifting device for an aerial work vehicle according to claim 1 or 2, wherein: