JP2002321894A - Lifting equipment for aerial work vehicles - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To facilitate the work of storing a sub boom and to improve the work efficiency of electric construction work and the like. A lifting device (30) is provided at an upper end of a vertical post (13) protruding upward from an upper part of a horizontal arm (17), and is swingably attached to a sub-boom (31). A winch mechanism attached to a rear end of the sub-boom (31). And a unit 50. A sub-boom 31 is mounted on the upper end of the vertical post 13 so as to be rotatable in a horizontal plane, a sub-boom holding member 35 mounted on an upper portion of the base 33 so as to be vertically swingable, and a sub-boom holding member. The sub-boom member 35 is configured to include a swing cylinder 41 that swings the sub-boom holding member 35 and a sub-boom member 43 that is mounted to be able to be inserted and withdrawn from the distal end side of the sub-boom holding member 35. Winch mechanism 50
Is attached to the rear end of the sub-boom holding member 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for an aerial work vehicle, and more particularly, to a vertical end of a boom mounted on a vehicle body at least regardless of the angle of the boom. The present invention relates to a lifting device for an aerial work vehicle, comprising: a vertical post to be mounted;

[0002]

2. Description of the Related Art An aerial work vehicle that performs an aerial work includes, for example, a boom that is attached to a vehicle body so as to be able to move up and down, and a boom that is attached to the end of the boom so that it can swing up and down. Regardless of the vertical post that is held vertically regardless of the vertical post, a horizontal arm that is attached to the vertical post so as to be pivotable in the horizontal direction, a work table that is attached to the end of the horizontal arm in a horizontal state, and an upper end of the vertical post And a lifting device that is provided.

The lifting device includes a sub-boom member extending with a sheave at the tip, a sub-boom bracket attached to the upper end of the vertical post so as to swing vertically, and a sub-boom bracket attached to the sub-boom bracket. And a winch mechanism.

[0004]

Here, when the sub-boom bracket is swung so that the sub-boom member is in a horizontal state in a state where the sub-boom member is mounted on the sub-boom bracket, the sub-boom member becomes higher than the upper surface of the work table. It moves to an upper position having a predetermined upper gap (hereinafter, this position is referred to as a “sub-boom storage position”). In addition, since the winch mechanism is attached to the tip of the sub-boom bracket, when the sub-boom member is in the horizontal state, the sub-boom bracket is in the upright state, and the winch mechanism is protruding above the horizontally extending sub-boom member. become. For this reason, when the sub-boom member is moved to the sub-boom storage position, the height at which the sub-boom member and the winch mechanism project from the upper surface of the workbench becomes too high. Therefore, in vehicles equipped with a conventional lifting device, the sub-boom member is removed from the sub-boom bracket and stored on the roof rack or in a tool box, and the sub-boom mechanism is positioned so that the winch mechanism does not protrude significantly upward from the upper surface of the work table. The boom bracket was swung and fixed. However, such a sub boom storing operation is very troublesome, and the operation efficiency is low.

[0005] In addition, when a worker who is on the work table performs an electric construction work, if the winch mechanism protrudes greatly on the upper surface side of the sub-boom member, the winch mechanism is connected to an electric wire or the like installed around the work site. There is a problem that there is a risk of being caught by an obstacle or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and facilitates the storing operation of the lifting device. When the lifting device is stored in the working table, a sub-boom member that projects upward from the upper surface of the working table, It is an object of the present invention to provide a lifting device for a high-altitude work vehicle in which the height of a winch mechanism is reduced and the winch mechanism is less likely to be caught by wires or the like.

[0007]

In order to solve the above-mentioned problems, a lifting device according to the present invention comprises a boom mounted at least on a vehicle body so as to be able to move up and down, and a boom mounted at a tip of the boom so as to be vertically swingable. Is mounted on an aerial work vehicle having a vertical post held in a vertical state irrespective of the elevation angle of the vertical post and a work table mounted on the vertical post in a horizontal state. The lifting device includes a sub-boom mounted on the upper part of the vertical post so as to swing vertically, and a winch mechanism mounted on a rear end of the sub-boom in the extension direction of the sub-boom.

According to the lifting device having the above structure, when the sub-boom to which the winch mechanism is attached is swung,
This sub-boom moves to the storage position of the workbench.

Here, since the winch mechanism is attached to the rear end of the sub-boom, the amount by which the winch mechanism projects from the upper surface of the sub-boom is small. For this reason, the possibility that the winch mechanism is caught by the electric wire or the like installed between the electric poles is small, and the work efficiency of electric construction work and the like can be improved. In addition, compared to the conventional sub-boom storing operation in which the sub-boom is detached and stored on a roof rack or in a tool box or the like, the sub-boom storing operation is completed by swinging the sub-boom with the winch mechanism attached. The work efficiency of the storing operation can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. This embodiment shows a form of an aerial work vehicle having a worktable pivotally mounted on a tip of a boom configured to be able to move up and down, swing and extend and contract on a vehicle body.

First, before describing the lifting device of the present invention, an aerial work vehicle equipped with the lifting device will be described.
As shown in FIG. 1, the aerial work vehicle 1 has wheels 3
, And is configured based on a truck having a driving cabin 5 at the front. Outrigger jacks 6 for lifting and supporting the vehicle body 4 are arranged on both left and right sides of the front and rear of the vehicle body of the truck vehicle. A swivel 7 which is driven by a swivel motor (not shown) and is capable of horizontal swivel is mounted on the vehicle body at the rear of the body. A boom 9 pivotally connected to a base end is attached to the swivel 7, and the boom 9 is configured to move up and down by an up and down cylinder 11. The boom 9 is configured such that a base end boom 9a, an intermediate boom 9b, and a distal end boom 9c are nested, and can be extended and contracted by a built-in extension cylinder (not shown).

A vertical post 13 is provided at the tip of the tip boom 9c.
Are vertically pivotally connected to each other, and the vertical post 13 is always moved by the upper leveling cylinder 15 disposed between the lower end of the vertical post 13 and the tip end of the tip boom 9c regardless of the elevation angle of the boom 9. The swing is controlled so as to be vertical. The vertical post 13 is provided with a horizontal arm 17 which is configured to be able to pivot in a horizontal plane, and a bottomed rectangular cylindrical workbench 19 is mounted on the tip of the horizontal arm 17. As a result, the work table 19 is always kept horizontal regardless of the angle of the boom 9. A lifting device 30 is provided above the horizontal arm 17.

The lifting device 30 is, as shown in FIG.
Vertical post 1 projecting upward from the upper part of horizontal arm 17
Sub boom 31 swingably attached to the upper end of the sub boom 31
And the sub-boom 31 in the extension direction of the sub-boom 31
And a winch mechanism 50 attached to the rear end of the vehicle. The sub-boom 31 is provided at the upper end of the vertical post 13 with a base 33 configured to be rotatable by a rotary motor (not shown) built in a horizontal plane, and a sub-boom holding member mounted on the upper part of the base so as to be vertically swingable. The sub-boom holding member 35 includes a member 35, a swing cylinder 41 that swings the sub-boom holding member 35, and a sub-boom member 43 that is attached so as to be able to be inserted and removed from the distal end side of the sub-boom holding member 35.

FIG. 3 will be further explained. FIG. 1A shows a front view of the lifting device 30 and FIG.
3 shows a plan view of the lifting device 30, and FIG. 3C shows a right side view of the lifting device 30. The base 33 has a pair of side plates 33 projecting upward with a predetermined gap in the left-right direction.
a. The sub-boom holding member 35 includes a sub-boom mounting hole 36 having a rectangular cross section having an opening 36a at a left end portion, and a main body portion 37 having a rectangular external shape,
A lower surface of the main body 37 is provided with a pair of support plate portions 38 projecting downward with a predetermined gap in the left-right direction. Mounting pins 47 are provided on the left and right side plates 37a of the main body 37.
Is formed in the hole. Each lower portion of the pair of support plate portions 38 is formed of a pair of side plate portions 33a.
The support plate portion 38 is connected to the side plate portion 33a via a pivot pin 48 inserted between them, and the main body portion 37 is swingable vertically with respect to the base 33. Installed. The position of the pivot pin 48 is arranged such that when the sub-boom member 43 is in a horizontal state above the upper surface of the work table 19, the lower surface of the sub-boom member 43 and the upper surface of the work table 19 are close to each other. Has been established. A swing cylinder 41 is provided between the pair of side plate portions 33a and the support plate portion 38.
Is pivoted.

The sub-boom member 43 is made of an insulating material (for example, made of FRP), has a similar cross-sectional shape to the cross-sectional shape of the sub-boom mounting hole 36, and has a sheave 44 rotatably attached to a tip end thereof. ing. A sub-boom insertion hole (not shown) through which the mounting pin 47 is inserted is formed on the base end side wall of the sub-boom member 43. A winch mechanism 50 is attached to the rear end of the main body 37. The winch mechanism 50 includes a casing 51 having an inverted U-shape in plan view, a winch main body 53 rotatably mounted inside the casing 51 and wound with a rope R, and a winch main body mounted outside the wall of the casing 51. And a winch motor 55 for driving the rotation of the motor 53. The tip of the rope R drawn out from the winch main body 53 extends toward the sheave 44, is hung around the sheave 44, and hangs downward. Rope R
The hook 57 is attached to the tip of the.

Next, with respect to the operation of the lifting device 30 according to the present invention, a case where the lifting device 30 is stored in the work table 19 will be described. Incidentally, the aerial work vehicle 1 is shown in FIG.
As shown in FIG. 2, the vehicle body 4 is lifted and supported by the outrigger jack 6, the work table 19 is moved to a desired work position, and the sub-boom 31 is raised and raised as shown by the broken line in FIG. Assume it is in a pivoted position.

As shown in FIG. 2, an operator (not shown) on the work table 19 presses the sub-boom member 43 in the horizontal direction to rotate the base 33 so that the extension direction of the sub-boom member 43 is In addition to rotating the sub-boom member 43 to a position along the upper surface of the worktable 19 by operating a sub-boom operating device (not shown) to reduce the swinging cylinder 41, the sub-boom member 43 is moved to a position in the same direction as the turning direction of the work table 19. The position is referred to as “sub boom storage position.”). As a result, the sub-boom member 43 is stored in the sub-boom storage position, and the storage operation of the lifting device 30 is completed. When the sub-boom member 43 is stored in the sub-boom storage position, the lower surface of the sub-boom member 43 is located at a position close to the upper surface of the work table 19. The sub-boom storage position is not limited to the direction in which the extension of the sub-boom member 43 extends in the same direction as the turning direction of the work table 19; the sub-boom member 43 is in a horizontal state, and the sub-boom member 43 is Any position that does not protrude from the worktable 19 may be used.

As described above, the lifting device 30 is connected to the work table 1.
9 can be stored by moving the sub-boom member 43 to the sub-boom storage position. Therefore, the sub-boom member is removed and compared with the storage operation of a conventional lifting device that stores the sub-boom member on a roof rack or in a tool box. This eliminates the need for removing the sub-boom member 43 and housing the sub-boom member 43 on a roof rack or the like.

When the lifting device 30 is stored in the workbench 19, the lower surface of the sub-boom member 43 is located close to the upper surface of the workbench 19, and the upper surface of the main body of the sub-boom holding member 35 of the winch mechanism 50. The amount h of protrusion from the projection is small. For this reason, the height of the sub-boom 31 and the winch mechanism 50 protruding from above the work table 19 can be reduced, and the work table 19 is stored in the vehicle and the lifting device 30 is moved to the storage position. When the vehicle travels, it is possible to widen the range of allowable heights at which the vehicle can pass when the vehicle passes through a place where the height is restricted.

Since the amount of projection of the sub boom member 43 of the winch mechanism 50 from the upper surface side is small, the work table 1
Even when the electric construction work is performed by bringing the electric wire 9 closer to a power pole or the like on which an electric wire (not shown) is erected, the possibility that the winch mechanism 50 is caught by the electric wire or the like is reduced, and the work efficiency of the electric construction work or the like can be improved. it can.

In the above-described embodiment, an example is shown in which the winch mechanism 50 is attached to the rear end of the main body 37. However, the present invention is not limited to this. It may be attached to any of the parts. in this case,
A guide roller (not shown) for guiding the rope R fed from the winch main body 53 to the upper surface side of the sub-boom member 43 is attached to the upper surface or the rear end of the main body portion 37. Further, in the above-described embodiment, the sub-boom member 43 is
Although an example in which the sub-boom member 43 is fixed via the mounting pin 47 is shown in the drawings, the present invention is not limited to this, and a sub-boom insertion hole (not shown) provided in the sub-boom member 43 has a predetermined gap in the axial direction of the sub-boom member 43. The length of the sub-boom member 43 projecting from the main body 37 may be changed by changing the sub-boom insertion hole through which the mounting pin 47 is inserted. Further, as shown in FIG. 4, the telescopic cylinder 61 is disposed in the main body 37, the bottom end of the telescopic cylinder 61 is pivotally connected to the main body 37, and the rod-side end is pivotally connected to the sub-boom member 43. Alternatively, the sub-boom member 43 may be configured to protrude from the main body 37 by the expansion and contraction movement of the expansion and contraction cylinder 61. With this configuration, it is possible to shorten the extension length of the state where the sub-boom 31 is fully contracted.

[0022]

According to the lifting device for the aerial work vehicle according to the present invention, the sub-boom is mounted on the upper part of the vertical post so as to swing vertically, and the winch mechanism is mounted on the rear end of the sub-boom in the extension direction of the sub-boom. By that
The amount by which the winch mechanism projects from the upper surface of the sub-boom is reduced. For this reason, the possibility that the winch mechanism is caught by the electric wire or the like installed between the electric poles is small, and the work efficiency of electric construction work and the like can be improved. Also, since the sub-boom storing operation is completed by swinging the sub-boom with the winch mechanism compared to the conventional sub-boom storing operation in which the sub-boom is removed and stored on a roof rack or in a tool box, etc. The work efficiency of the storing operation can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of an aerial work vehicle equipped with a lifting device according to an embodiment of the present invention.

FIG. 2 is a front view of the lifting device according to the embodiment of the present invention.

3A and 3B show a lifting device according to an embodiment of the present invention. FIG. 3A is a front view of the lifting device, and FIG. 3B is a plan view of the lifting device, and FIG. FIG. 4 is a right side view of the lifting device.

FIG. 4 is a front view of the lifting device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Height working vehicle 4 Body 9 Boom 13 Vertical post 19 Workbench 30 Lifting device 31 Sub boom 50 Winch mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F333 AA08 AB04 AC12 BA12 BB03 BB08 BD02 BE02 DA07 DB10

Claims (1)

[Claims] 1. A boom mounted at least on a vehicle body so as to be able to move up and down, and a vertical post which is mounted at a tip end of the boom so as to be swingable in a vertical direction and held in a vertical state irrespective of the boom angle. A lifting device for an aerial work vehicle having a workbench horizontally mounted on the vertical post, a sub-boom mounted to be able to swing vertically on an upper portion of the vertical post, and in a direction in which the sub-boom extends. And a winch mechanism attached to a rear end of the sub-boom.