JP2569861Y2 - Aerial work vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work vehicle.

[0002]

2. Description of the Related Art As shown in FIG. 3, a work platform for aerial work is a swivel 2 mounted on a vehicle 1 so as to be capable of swiveling, and a base end of the swivel 2 is rotatable via an up-and-down fulcrum shaft 3. The telescopic boom 4 connected to the telescopic boom 4, the telescopic boom hoist cylinder 5 interposed between the telescopic boom 4 and the swivel 2 at appropriate positions, and the boom tip bracket 8 attached to the distal end of the telescopic boom 4. A rotating bracket 10 whose lower end is rotatably connected in the undulating direction via a bracket fulcrum shaft 9 parallel to the undulating fulcrum shaft 3, and is interposed between the tip of the telescopic boom 4 and an appropriate position of the rotating bracket 10. A leveling cylinder 11 for rotating the rotating bracket 10 about the bracket fulcrum shaft 9 in association with the up-and-down movement of the telescopic boom 4 to keep the attitude of the rotating bracket 10 constant, and a substantially rectangular floor surface 14a. A worktable 14 is constituted me similar in the worktable 14 mounted for horizontal turn driving around a turning center O to the upper end of the hinge bracket 10 having.

As shown in FIG. 3, in the conventional aerial work vehicle, the worktable 14 is mounted on the rotating bracket 10 so that the worktable 14 can be turned horizontally so that the turning center O is positioned directly above the bracket fulcrum shaft 9. It is configured to be. Further, the worktable 14 is attached to the rotating bracket 10 so as to be horizontally turnable such that a center O of the worktable crosses the outside of the worktable 14 vertically. The rotating bracket 1
A leveling cylinder mounting arm 10a extending downward from the lower end is attached to the lower end of the zero. The leveling cylinder 11 is disposed between the leveling cylinder mounting arm 10a and the tip of the telescopic boom 4 at an appropriate position. Rotation of the telescopic boom 4).
Similarly, the extension force supports the rotation of the rotating bracket 10 about the bracket fulcrum shaft 9 in the falling direction (the same direction as the falling direction of the telescopic boom 4).

That is, in the conventional aerial work vehicle, the turning center O of the work table 14 is located directly above the bracket fulcrum shaft 9 connecting the rotating bracket 10 and the tip of the telescopic boom 4. . The worktable 14 is attached so that the center of rotation O crosses the outside of the worktable 14 vertically. The leveling cylinder 11 supports the pivoting of the pivoting bracket 10 in the raising direction (the same direction as the raising direction of the telescopic boom 4) about the bracket fulcrum shaft 9 by its contracting force, and its extension. Similar to the force, the rotation bracket 10 is arranged to support the rotation of the rotation bracket 10 about the bracket fulcrum shaft 9 in the falling direction (the same direction as the falling direction of the telescopic boom 4). Is a characteristic configuration requirement.

This type of aerial work vehicle adjusts the position of the workbench 14 by using both the swinging operation of the workbench 14 and the operation related to the telescopic boom by the swivel drive of the swivel base 2 and the up / down telescopic drive of the telescopic boom 4. High-place work with arbitrary changes.

In the conventional work vehicle constructed as described above, the work table 14 is mounted on the rotation bracket 10 so that the work table 14 can be horizontally turned and driven so that the center of rotation O is located immediately above the bracket fulcrum shaft 9. Work table 14
The pivoting force (moment) in the raising direction about the bracket fulcrum shaft 9 acting on the rotating bracket 10 due to the weight of the worktable 14 when the armature pivots toward the base end side of the telescopic boom 4.
And the turning force (moment) in the falling direction about the bracket fulcrum shaft 9 acting on the rotating bracket 10 due to the weight of the work table 14 when the work table 14 turns to the distal end side of the telescopic boom 4. Are to be equal.

On the other hand, in the leveling cylinder 11, the effective pressure receiving area of the oil chamber supporting the pulling force is smaller than the effective pressure receiving area of the oil chamber supporting the compressing force, and if the compressive force and the pulling force are the same, the tensile force is reduced. The hydraulic pressure of the supporting oil chamber is increased. Therefore, the leveling cylinder 11 in this type of aerial work vehicle is designed to withstand the internal pressure of the oil chamber that supports the pulling force. And the leveling cylinder 11 designed in such a way has a surplus to the compressive force.

[0008]

SUMMARY OF THE INVENTION The present invention provides a new aerial work vehicle in which the ratio of the tensile force to the compressive force acting on the leveling cylinder 11 is smaller than that of the prior art. It is an object of the present invention to provide a new aerial work vehicle capable of utilizing the remaining power for the eleventh compression force.

[0009]

To achieve the above object, the aerial work vehicle of the present invention is configured as follows. (Invention of Claim 1) A swivel 2 mounted on a vehicle 1 so as to be able to swing and drive, a telescopic boom 4 and a telescopic boom 4 whose base end is connected to the swivel 2 via a fulcrum shaft 3 so as to be able to move up and down. And a telescopic boom raising / lowering cylinder 5 interposed between appropriate positions of the swivel base 2 to drive the telescopic boom 4 up and down, a boom tip bracket 8 attached to the distal end of the telescopic boom 4 and a bracket fulcrum shaft 9 parallel to the undulating fulcrum shaft 3. A pivot bracket 10 whose base end is rotatably connected in the up-and-down direction via an interposition between the distal end of the telescopic boom 4 and an appropriate position of the pivot bracket 10 in relation to the up-and-down movement of the telescopic boom 4. A leveling cylinder 11 for rotating the rotating bracket 10 around the bracket fulcrum shaft 9 and keeping the attitude of the rotating bracket 10 constant; and
A work platform 14 having a substantially rectangular floor surface 14a, which is constructed in a similar manner to a work platform 14 which is attached to the upper end of the rotating bracket 10 so as to be capable of horizontal swing drive around a swing center O. In the vehicle, the worktable 14 is attached to the turning bracket 10 so that the worktable 14 can be turned horizontally so that the turning center O is displaced in the base end direction of the telescopic boom 4 with respect to the bracket fulcrum shaft 9. The worktable 14 has a center of rotation O on the floor surface 14 of the worktable 14.
a, which is attached to the rotating bracket 10 so as to be able to rotate horizontally so as to be closer to one end in the longitudinal direction of a.
The leveling cylinder 11 is attached to the distal end of the telescopic boom 4, extends from the telescopic boom 4 to the base end of the telescopic boom 4, and extends from the telescopic boom 4. The pivot bracket 10 is disposed between the upper position and the position above the bracket fulcrum shaft 9 in an appropriate position, and the extension of the pivot bracket 10 about the bracket fulcrum shaft 9 is similar to the extension force. Characterized in that it is configured to support rotation in the direction of rotation, and to support the rotation of the rotation bracket 10 in the falling direction about the bracket fulcrum shaft 9 in a similar manner by the reduction force. .

[0010] A swivel 2 mounted on a vehicle 1 so as to be able to swing freely, a telescopic boom 4 whose base end is connected to the swivel 2 via an up-and-down fulcrum shaft 3 so as to be able to rise and fall. A telescopic boom raising / lowering cylinder 5 interposed between the telescopic boom 4 and the swivel base 2 at an appropriate position for driving the telescopic boom 4 up and down, and a boom tip bracket 8 extending downward from the front end of the telescopic boom 4 to the front end thereof. A pivot bracket 10 whose base end is rotatably connected in an up-and-down direction via a bracket pivot shaft 9 parallel to the fulcrum shaft 3, and is interposed between the distal end of the telescopic boom 4 and an appropriate position of the pivot bracket 10. Rotating bracket 1 in relation to the up and down movement of telescopic boom 4
And a worktable 14 having a substantially rectangular floor surface 14a. The leveling cylinder 11 keeps the posture of the rotating bracket 10 constant by rotating the rotating bracket 11 around the bracket fulcrum shaft 9. Work table 1 attached to the upper end of the robot so that it can be driven to rotate horizontally about the center of rotation O
4, the work platform 14 is mounted on the rotating bracket 10 so that the worktable 14 can be turned horizontally. The turning center O is fixed to the telescopic boom 4 with respect to the bracket fulcrum shaft 9. The worktable 14 is configured such that the turning center O of the worktable 14 is located at a position closer to one end of the floor surface 14a of the worktable 14 in the longitudinal direction. The leveling cylinder 11 is attached to the inside of a hollow portion at the distal end of the telescopic boom 4 and at a position on the rotating bracket 10, and the leveling cylinder 11 is moved from the bracket fulcrum shaft 9. Is also located in a proper position between the upper position and the upper position, and supports the rotation of the rotating bracket 10 in the raising direction about the bracket fulcrum shaft 9 by the extension force, and the reduction force thereof. Similar rotating braquet Aerial, characterized in that are configured to support the rotation of the lodging direction around the bracket support shaft 9 bets 10.

[0011]

In the aerial work vehicle constructed as described above, the work table 14 is mounted on the rotating bracket 10 so that the work table 14 can be driven to turn horizontally, and the turning center O is set to the bracket fulcrum shaft 9.
, The position of the telescopic boom 4 is shifted toward the base end of the telescopic boom 4. 10 against the pivoting force (moment) in the raising direction about the bracket fulcrum shaft 9 acting on the
The pivoting force (moment) in the falling direction about the bracket fulcrum shaft 9 acting on the rotating bracket 10 due to the weight of the worktable 14 when the is pivoted toward the distal end side of the telescopic boom 4.
Is smaller. Then, the leveling cylinder 11 supports the rotation of the rotating bracket 10 about the bracket fulcrum shaft 9 in the raising direction similarly by the extension force, and the rotation bracket 10 of the rotating bracket 10 similarly by the contraction force. Since it is arranged to support the rotation in the falling direction about the bracket fulcrum shaft 9, the ratio of the tensile force to the compressive force acting on the leveling cylinder 11 is smaller than that of the conventional one. Therefore, the remaining force of the leveling cylinder 11 with respect to the compression force can be utilized, and the supporting force of the leveling cylinder 11 can be effectively utilized accordingly. In other words, the weight of the leveling cylinder 11 can be reduced.

Further, the worktable 14 is mounted on the rotating bracket 10 so as to be horizontally turnable so that the center line O of the worktable is closer to one end of the floor surface 14a of the worktable 14 in the longitudinal direction. Floor surface 14 of worktable 14 on O
Since a portion of a is located, the conventional aerial work vehicle having a work table 14 having the same size of floor surface is raised and lowered around the bracket fulcrum shaft 9 acting on the rotating bracket 10. The rotational force (moment) in the direction becomes smaller, and in this sense, the weight of the leveling cylinder 11 can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an aerial work vehicle according to the present invention will be described below with reference to FIGS. The aerial work vehicle of the present invention is different from the conventional aerial work vehicle in that the position of the turning center O of the worktable 14 with respect to the bracket fulcrum shaft 9, the position of the turning center O with respect to the worktable 14, and the disposition of the leveling cylinder 11. Since only the configuration is different, the reference numerals used in the above description, except for this difference, are used as synonyms in the following description.

FIG. 1 shows an embodiment corresponding to claim 1 of the present invention. In FIG.
The pivot center O of the telescopic boom 4 has a bracket fulcrum shaft 9 at the front end of the telescopic boom 4 (the front end of the telescopic boom 4
Is located at a position deviated toward the base end side of the telescopic boom 4 with respect to a bracket fulcrum shaft 9) that connects the rotating bracket 10 to the extending end of the boom tip bracket 8 extending downward and attached to the front. To the upper end of the rotating bracket 10. Further, the worktable 14 is provided with the rotating bracket 10 so that the center of rotation O of the worktable 14 is located at a position closer to one longitudinal end of the floor surface 14 a of the worktable 14.
Is mounted so that it can be driven to rotate horizontally.

At the distal end of the telescopic boom 4, a frame A for mounting the boom distal end support shaft 13 of the leveling cylinder 11 is mounted. The frame A is attached to the distal end of the telescopic boom 4 and extends from the telescopic boom 4 to the base end of the telescopic boom 4 so as to be cantilevered. When the frame is reduced, the frame A is the outer boom of the telescopic boom 4 (base end boom).
So that it does not interfere with The leveling cylinder 11 is disposed between the extending end of the frame A and a position on the rotating bracket 10 and above the bracket fulcrum shaft 9. The leveling cylinder 11 arranged in this way is the leveling cylinder 1
The extension force of 1 supports the pivoting of the pivot bracket 10 about the bracket fulcrum shaft 9 in the raising direction, and the contraction force of the pivot bracket 10 revolves around the bracket fulcrum shaft 9 of the pivot bracket 10. It supports the turning in the falling direction.

FIG. 2 shows an embodiment corresponding to claim 2 of the utility model registration claim. In FIG.
The pivot center O of the telescopic boom 4 has a bracket fulcrum shaft 9 at the front end of the telescopic boom 4 (the front end of the telescopic boom 4
Is located at a position deviated toward the base end side of the telescopic boom 4 with respect to a bracket fulcrum shaft 9) that connects the rotating bracket 10 to the extending end of the boom tip bracket 8 extending downward and attached to the front. To the upper end of the rotating bracket 10. Further, the worktable 14 is provided with the rotating bracket 10 so that the center of rotation O of the worktable 14 is located at a position closer to one longitudinal end of the floor surface 14 a of the worktable 14.
Is mounted so that it can be driven to rotate horizontally.

A bracket-side support shaft 12 for connecting one end of the leveling cylinder 11 to the rotating bracket 10 is provided with a telescopic boom 4 (a hollow boom at the distal end is sequentially inserted into a hollow boom at the proximal end so as to be extendable and retractable). This is a known device in which an appropriate telescopic drive device (not shown) is arranged between the booms). Extend the other end of the leveling cylinder 11 to the telescopic boom 4
The boom distal end side support shaft 13 connected to the distal end side of the telescopic boom 4 is disposed inside the hollow portion at the distal end of the telescopic boom 4.
That is, the leveling cylinder 11 is located between the inner part of the hollow portion at the tip of the telescopic boom 4 and a position on the rotating bracket 10 above the bracket fulcrum shaft 9. The extension fulcrum supports the pivoting of the pivot bracket 10 about the bracket fulcrum shaft 9 in the raising direction in a similar manner, and the contraction force resembles the bracket fulcrum axis of the pivot bracket 10 in a similar manner. It is configured to support rotation in the falling direction around the center 9. In this example, most of the leveling cylinder 11 is housed in the hollow portion at the distal end of the telescopic boom 4.

Next, the operation will be described. The aerial work vehicle according to the embodiment of FIGS. 1 and 2 is similar to a conventional aerial work vehicle,
Using the boom-related operation by the swivel drive of the swivel base 2 and the boom-extendable telescopic drive of the telescopic boom 4 and the swivel operation of the work table 14, the position of the work table 14 is arbitrarily changed to perform work at high places. The work table 1 for the rotating bracket 10
4 is mounted so that the center of rotation O is displaced in the base end direction of the telescopic boom 4 with respect to the bracket fulcrum shaft 9, so that the worktable 14 is The workbench 14 expands and contracts in response to a turning force (moment) in the raising direction about the bracket fulcrum shaft 9 acting on the rotating bracket 10 due to the weight of the workbench 14 when the workbench 14 is pivoted to the base end side. The turning force (moment) in the tilting direction about the bracket fulcrum shaft 9 acting on the turning bracket 10 due to the weight of the worktable 14 when turning to the distal end side of the work 4 becomes smaller.

The leveling cylinder 11 supports the pivoting of the rotating bracket 10 about the bracket fulcrum shaft 9 in the raising direction in a similar manner by the extension force, and the similar rotation by the contracting force. Since the bracket 10 is arranged so as to support the rotation of the bracket 10 about the bracket fulcrum shaft 9 in the falling direction, the ratio of the tensile force to the compressive force acting on the leveling cylinder 11 is smaller than that of the conventional one. is there. Therefore, the remaining power of the leveling cylinder 11 with respect to the compression force can be utilized, and the leveling cylinder 1
This makes it possible to effectively use the support force of (1). In other words,
The weight of the leveling cylinder 11 can be reduced.

Further, the worktable 14 is mounted on the rotating bracket 10 so as to be horizontally turnable so that the center line O of the worktable is closer to one end of the floor surface 14a of the worktable 14 in the longitudinal direction. Floor surface 14 of worktable 14 on O
Since a portion of a is located, the conventional aerial work vehicle having a work table 14 having the same size of floor surface is raised and lowered around the bracket fulcrum shaft 9 acting on the rotating bracket 10. The rotational force (moment) in the direction becomes smaller, and in this sense, the weight of the leveling cylinder 11 can be reduced.

In the case where the leveling cylinder 11 is arranged as shown in the embodiment of FIG. 2, since most of the leveling cylinder 11 is located in the hollow portion at the distal end of the telescopic boom 4, The excellent effect that the periphery of the end of the boom 4 can be made compact can be achieved.

[0022]

According to the aerial work vehicle of the present invention constructed and operated as described above, the ratio of the tensile force to the compressive force acting on the leveling cylinder 11 is smaller than that of the conventional art, and the compressive force of the leveling cylinder 11 is reduced. You can make use of your spare capacity. In addition, since the rotating force (moment) in the undulating direction about the bracket fulcrum shaft 9 acting on the rotating bracket 10 is reduced, the weight of the leveling cylinder 11 can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention with respect to claim 1 of the aerial work vehicle;

FIG. 2 is an explanatory view of a second embodiment of the aerial work vehicle according to the present invention;

FIG. 3 is an explanatory view of a conventional aerial work vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Vehicle, 2; Swivel base, 3; Elevating fulcrum axis, 4; Telescopic boom, 5; Telescopic boom undulating cylinder, 6;
7; boom base end side support shaft; 8; boom tip bracket;
9; bracket fulcrum shaft; 10; rotating bracket; 11;
Leveling cylinder, 12; bracket side support shaft, 13;
Telescopic boom tip side support shaft, 14; work table, 14a; floor surface,
O: center of rotation, A: frame,

Claims (2)

(57) [Scope of request for utility model registration] 1. A swivel base 2 mounted on a vehicle 1 so as to be able to swing and drive, a telescopic boom 4 having a base end connected to the swivel base 2 via a hoisting fulcrum shaft 3, and a swivel with the telescopic boom 4. A telescopic boom raising / lowering cylinder 5 interposed between appropriate places of the base 2 to drive the telescopic boom 4 up and down, and a boom tip bracket 8 attached to the tip of the telescopic boom 4 via a bracket fulcrum shaft 9 parallel to the fulcrum shaft 3. A pivot bracket 10 having its lower end pivotally connected in the up-and-down direction; a pivot bracket interposed between the tip of the telescopic boom 4 and a proper position of the pivot bracket 10 in relation to the up-and-down movement of the telescopic boom 4; A worktable 1 having a leveling cylinder 11 for rotating the bracket 10 around the bracket fulcrum shaft 9 to maintain the posture of the rotating bracket 10 always constant, and a substantially rectangular floor surface 14a.
4, a work platform similar to a worktable 14 attached to the upper end of the turning bracket 10 so as to be capable of horizontal turning driving around a turning center O, The work table 14 is configured such that the center of rotation O is displaced in the base end direction of the telescopic boom 4 with respect to the bracket fulcrum shaft 9 with respect to the work table 14. The leveling cylinder 11 is mounted on the rotating bracket 10 so that the center of rotation O can be shifted to one end in the longitudinal direction of the floor surface 14 a of the worktable 14. An extension end of a frame body A which is attached to a distal end portion and extends from the telescopic boom 4 to the proximal end side through the outside of the telescopic boom 4; Above the upper position, supports the rotation of the rotation bracket 10 about the bracket fulcrum shaft 9 in the raising direction in a similar manner by its extension force, and is similar by its contraction force. An aerial work vehicle, which is configured to support rotation of a rotating bracket 10 in a falling direction about a bracket fulcrum shaft 9. 2. A swivel base 2 mounted on a vehicle 1 so as to be capable of swiveling drive, a telescopic boom 4 having a base end connected to the swivel base 2 via a hoisting fulcrum shaft 3, and a telescopic boom 4. A telescopic boom raising / lowering cylinder 5 interposed between the appropriate places of the base 2 and driving the telescopic boom 4 up and down, and a boom tip bracket 8 extending downward from the front end of the telescopic boom 4 to be parallel to the hoisting fulcrum shaft 3. Bracket 10 whose lower end is rotatably connected in the up-and-down direction via a simple bracket fulcrum shaft 9, the distal end of the telescopic boom 4 and the rotating bracket 10.
A leveling cylinder 11, which is interposed between the right and left positions of the telescopic boom 4 and rotates the rotating bracket 10 about the bracket fulcrum shaft 9 to keep the posture of the rotating bracket 10 constant. , A substantially rectangular floor surface 14
a working table 14 having the rotation bracket 10
A work platform 14 similar to a work table 14 that is mounted on the upper end of the work table 14 so as to be capable of horizontal swing drive about a swing center O, wherein the work table 14 is horizontally rotatable with respect to the rotating bracket 10. The mounting center is configured such that the center of rotation O is displaced in the base end direction of the telescopic boom 4 with respect to the bracket fulcrum shaft 9. The leveling cylinder 11 is attached to the rotating bracket 10 so as to be freely rotatable horizontally at a position near one end in the longitudinal direction of the floor surface 14a. And a position above the pivot fulcrum shaft 9 and above the bracket fulcrum shaft 9. The pivoting bracket 10 is configured to support pivoting in the raising direction centered on the pivotal axis, and to support pivoting in the falling direction about the bracket fulcrum shaft 9 of the pivoting bracket 10 similarly by the reduction force. And aerial work vehicles.