JPH09263393A - Vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widen the horizontal turning range of a work box by mounting a first boom which can be freely tilted on a turning base which is mounted on a vehicle body such that it can be horizontally turned and by mounting on the tip of the first boom a second boom which is extendably mounted at an offset position in a horizontal direction with respect to the center axis of the first boom and by mounting the work box on the tip of the second boom. SOLUTION: A first boom 5 is composed of a parallel mechanism and its connecting portion with a connecting member 7 is located over tool boxes 3a, 3b when the first boom is fully tilted and a second boom 6 is made such that it can be freely tilted and extended around the connecting member 7. Therefore the operation range of the second boom 6 is not limited and the second boom 6 can be tilted to the mechanical end. The first boom does not interfere with the tool boxes 3a, 3b even if it is turned 360 degree in a fully tilted state and, hence, a low-place work can be performed in the entire periphery of a vehicle for high lift work by extending and tilting the second boom 6, which can widen a working range and improve workability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention attaches a first boom to a swivel mounted on a vehicle body so that the boom can be raised and lowered, and a second boom is attached to the tip of the first boom so that the boom can be extended and retracted. Regarding an aerial work vehicle configured such that a workbench is attached to the end of the second boom, more specifically, when a storage means such as a tool box is provided on the vehicle body,
The present invention relates to an aerial work vehicle configured such that the storage means does not interfere with the drive of the boom.

[0002]

2. Description of the Related Art As such an aerial work vehicle, a first boom composed of parallel links is attached to a swivel base, and a second boom which is telescopically extendable is attached to the first boom. The one in which a retractable first boom is attached to a swivel and a retractable second boom is attached to the tip of the first boom has been conventionally known and put into practical use. Such aerial work vehicles are often used for wiring work,
In order to improve the convenience of the work, a large storage means such as a tool box is often arranged on the side of the vehicle body.

[0003]

By the way, in such an aerial work vehicle, the swiveling operation of the swivel base, the hoisting operation of the first boom, and the hoisting operation of the second boom with respect to the first boom (this is called bending operation). The workbench is moved to a desired high place by controlling the so-called), but when such an operation is performed, there is a risk that the large storage means arranged on the side of the vehicle body or the like interferes with the first boom. There is. For this reason, there has been a problem that the workability is deteriorated because it is necessary to regulate the fall of the first boom at a place other than the turning storage place.

In order to solve this problem, if the height of the storage means such as a tool box is lowered, the loading space is reduced, and conversely, in consideration of workability, the turntable part of the swivel base on the vehicle body. If the height (hereinafter referred to as the T / T portion) is increased to avoid interference with the storage means, the first boom will be located directly below the conventional second boom.
In the work device having the conventional configuration including the boom, the entire vehicle height when the boom is stored is increased. Further, if the height of the T / T portion of the swivel base is lowered to suppress the height of the vehicle in the retracted state, or the position of the pivot pin of the bending portion of the first boom and the second boom is lowered, the work platform is lowered. There was also a problem that the workability would be deteriorated again because of the sacrifice of the lifting height.

On the other hand, in order to secure the traveling stability in the traveling posture, it is necessary to store the workbench at a low position at the rear of the vehicle to reduce the total height of the vehicle. In this case, the lift of the workbench is secured. Therefore, there is also a method in which the turning center of the boom is located on the center axis of the vehicle to improve stability when the boom is raised and lowered. However, in order to store the boom and the workbench within the vehicle width dimension, it is necessary to shorten the first boom length, and as a result, it is necessary to sacrifice the workbench lift. When trying to secure the desired work platform lift, it cannot be shortened more than necessary, so it is necessary to arrange the boom diagonally with respect to the vehicle center axis, and as a result, secure a loading space for tools, etc. There was also a problem that it became difficult.

The present invention has been made in view of the above problems. Even in an aerial work vehicle equipped with a large storage means such as a tool box on the side of the vehicle body, the boom and the storage means do not interfere with each other. It is an object of the present invention to provide a work platform for aerial work that can secure a wide horizontal swing range of the work table without fear and has good workability without sacrificing the lift of the work table. When the boom is retracted, the overall vehicle height can be lowered,
It is an object of the present invention to provide an aerial work vehicle that can sufficiently secure a loading space for a tool box or the like.

[0007]

In order to achieve such an object, the aerial work vehicle according to the first aspect of the present invention has a swivel base disposed on the vehicle body so that the swivel can be horizontally swung, and the swivel base can be raised and lowered freely. The first boom is attached, and a second boom having a central axis offset at least horizontally with respect to the central axis of the first boom is flexibly attached to the tip of the first boom.
A workbench is attached to the tip of the second boom, and the first boom is arranged and stored so as to extend obliquely downward from the upper part of the swivel base toward the front, and the second boom is moved to the first boom. It is configured to extend obliquely downward from the front end of the vehicle to be stowed on the vehicle body.

An aerial work vehicle according to a second aspect of the present invention comprises a first boom constructed as described above, a connecting member attached to the tip of the first boom, and the center of the first boom connected via the connecting member. A second boom having a central axis that is offset at least horizontally with respect to the axis is flexibly attached to the first boom, and a workbench is attached to the tip of the second boom. It is arranged so as to extend obliquely downward from the upper part of the swivel base and is stored therein, and is pivotally connected to the lower end of the connecting member at the tip end thereof, and the second boom is pivotally connected to the first boom and the connecting member. It is configured so as to be pivotally connected to the connecting member above the connecting point and to be arranged and stored so as to extend obliquely downward from the connecting member toward the rear. Then, the first boom and the second boom are configured to be X-shaped and stored on the vehicle body in a side view.

Further, in the aerial work vehicle according to the third aspect of the present invention, a swivel base is disposed on the vehicle body so as to be horizontally swivelable, and a first boom is attached to the swivel base so that the first boom can be raised and lowered. A second boom having a central axis that is at least horizontally offset with respect to the central axis of the first boom is flexibly attached to the second boom, and a workbench is attached to the tip of the second boom. Is located on the center axis of the vehicle body that extends forward and backward through the center of the vehicle body in the width direction, and the first boom and the second boom are
It is configured to extend parallel to the center axis of the vehicle body for storage. In any of the inventions, it is preferable that the first boom has a parallel link mechanism.

When the work is carried out by the aerial work vehicle having such a structure, if the operator operates the operating means such as turning, undulating and expanding and contracting, the operation based on this operation is performed. By hoisting the first boom during work, the workbench can be turned 360 degrees and the second boom can be extended and retracted without worrying about interference with a storage means such as a tool box. Therefore, it is possible to secure a higher work platform lift in a limited space, and it is also possible to perform low-level work on the side of the vehicle, thus ensuring a wide working range,
The operation is also easy.

Further, since the center axes of the first boom and the second boom are arranged offset from each other in the horizontal direction,
When traveling, it is not necessary to store them by stacking them on top of each other. Both the first boom and the second boom are tilted downward from the base end, and they are stored so as to zigzag in a side view or cross each other. can do. Therefore, the overall height of the vehicle can be reduced and the vehicle can be compactly stored. Further, when the swing center of the swivel base is arranged on the center axis of the vehicle body extending in the widthwise center of the vehicle body in the front-rear direction, the left and right stability associated with the turn of the work platform can be secured equally. At the same time, a storage space for tools and the like and a storage space for the workbench can be secured, so that the space on the vehicle body can be effectively used.

Further, in any case, by constructing the first boom by the parallel link mechanism, the boom length required to secure the same lifting height can be shortened, and the boom can be stored parallel to the vehicle center axis during storage. It is possible. It should be noted that when the first boom is raised, the work platform is swung beyond the swing angle allowed during storage, and when the second boom is in a range other than the swing angle allowed during storage, the first boom is Although it is necessary to regulate the fall operation of the boom, the operation of the second boom is not regulated and can be freely operated. In addition, when the second boom is reduced and the turning angle is within the predetermined storage angle range, there is no limit to the operation of the first boom, and the first boom can be stowed to the storage position while lying down.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. An example of an aerial work vehicle according to the present invention is shown in FIG. This aerial work vehicle comprises a self-propelled vehicle body 2 and an aerial work device 1. A swivel base 4 configured to be capable of horizontal swiveling is arranged on a vehicle body center axis 2c extending slightly backward from the center of the car body 2 and extending in the widthwise center of the car body in the front-rear direction. First boom 5 composed of two link members 5a and 5b extending at
Is mounted so that it can be undulated. A hoisting cylinder (hoisting actuator) is provided between the first boom 5 and the swivel base 4.
8 is provided, and the hoisting cylinder 8 hovers the first boom 5.

A connecting member 7 is pivotally connected to the tip end of the first boom 5, and the second boom 6 is located beside the first boom 5 and has a base end portion pivotally connected to the connecting member 7. As shown in FIG. 5, it extends parallel to the first boom 5 in a plan view. The second boom 6 is composed of a telescopic base boom member 6a that is telescopic, an intermediate boom member 6b and a tip boom member 6c, and is arranged between the connecting member 7 and the base boom member 6a. The second boom 6 is bent (extended and raised) with respect to the first boom 5 by the bending cylinder (flexing actuator) 9. In addition, a telescopic cylinder (not shown) arranged in the second boom 6 telescopically operates the intermediate and distal boom members 6b and 6c with respect to the proximal boom member 6a.

A vertical post that extends in the vertical direction at all times is attached to the tip of the tip boom member 6c through a leveling mechanism (not shown), and the workbench 10 can be horizontally swiveled (swingable) around the vertical post. Is attached. An operator can be placed on the workbench 10, and the work can be held horizontally by the leveling mechanism at all times and can swing around a vertical post.

The vehicle body 2 provided with the aerial work apparatus 1 having such a structure is provided with left and right tool boxes 3a, 3b which are located on the left and right of the swivel 4 and extend forward and backward.
The tool boxes 3a and 3b are provided for the purpose of storing tools necessary for work at high places. It is desirable to make the tool boxes 3a and 3b as large as possible, and as a result, as shown in FIG. 2, the work platform 1 (the swivel base 4, the first and second booms 5 and 6 and the work platform 10) is It is formed so as to sandwich the first boom 5 and the second boom 6 from the left and the right in a state in which the configured device) is stored.

A high-altitude work using the aerial work vehicle having such a structure will be briefly described below. When performing work at a high place, first, when the worker is in the storage state shown in FIG.
0 and operate the operating lever 11 to move the first boom 5
Perform the raising operation. After the first boom is raised with a sufficient elevation angle, the worker causes the swivel base 4, the swivel motion of the swivel base 4, the flexing / extending and retracting motion of the second boom 6, the swing motion of the work space 10, and the like, and the work space 10 is moved. Move to the desired height. FIG. 3 shows a state in which the workbench 10 is moved to a desired high place in this way.
Is shown in

By the way, as can be seen from FIG. 3, tool boxes 3a and 3b having a predetermined height are provided on the left and right sides of the vehicle body 2.
In the conventional telescopic boom, the tool boxes 3a and 3b may interfere with the boom. Therefore, the operator must operate the boom with care so as not to interfere with the tool boxes 3a and 3b, which causes a deterioration in workability.

In this embodiment, the first boom 5 is constituted by a parallel link mechanism, and the first boom 5 is sufficiently undulated so that the connecting portion with the connecting member 7 is located above the tool boxes 3a, 3b, and the connecting member 7 is used as a base point. Since the second boom 6 is configured so as to be vertically movable, the operation of the second boom 6 is not restricted, and the second boom 6 can be laid down to the mechanical end. Also, the first
The boom 5 does not interfere with the tool boxes 3a and 3b even if the boom 5 makes a full turn of 360 degrees in the fully raised state. Therefore, by extending and retracting the second boom, the boom 5 can be used around all vehicles of the aerial work vehicle. Work in low places is also possible. FIG.
(A) is a diagram showing a range in which work can be performed by the aerial work vehicle according to the present invention, in comparison with a conventional aerial work vehicle (FIG. (B)).

Next, the storage of the boom of such an aerial work vehicle will be described with reference to FIGS. After the work at a high place is completed, the operator operates the telescopic cylinder to fully retract the second boom 6, and swivels the swivel base 4 to a predetermined storage position.
After that, the hoisting cylinder 8 and the bending cylinder 9 are operated to store the first boom 5 and the second boom 6 in a predetermined storage state on the vehicle body 2. The first boom 5 is composed of two parallel link members 5a and 5b, and one end of each of the parallel link members 5a and 5b is pivotally attached to the swivel base 4 by two parallel link pins 51 and 52. . Then, the retracting cylinder 8 is contracted in the retracted state,
Both of the parallel link members 5a and 5b are stored while being inclined obliquely downward from the upper portion of the swivel base 4 toward the front of the vehicle body.

The parallel link members 5a and 5b have the same length, and the other ends thereof are pivotally attached to the lower end portion of the connecting member 7 by two parallel link pins 53 and 54. Therefore, the first
Even if the boom 5 is moved up and down, the link mechanism keeps the connecting member 7 standing vertically. As shown in FIG. 2, the second boom 6 is arranged with its center axis horizontally offset from the center axis of the first boom 5, and is pivotally connected to the upper end of the connecting member 7 by a foot pin 61. Then, when retracted, the coupling member 7 is stowed obliquely downward from the upper end of the connecting member 7 toward the rear part of the vehicle body (in the direction of the swivel base 4). As shown in FIG. 1, the first boom 5 and the second boom 5 are seen in a side view. 6 is stored in an X shape.

Further, in the present embodiment, since the first boom 5 is constituted by the parallel link members 5a and 5b, it is possible to construct the boom length shorter than before in order to obtain the required lift, and the position of the swivel base 4 is increased. Is arranged on the vehicle body central axis 2c, and the first boom 5 is stored so as to extend on the vehicle body central axis 2c toward the front of the vehicle body. The second boom 6 connected to the first boom with its center axis horizontally offset by the connecting member 7 extends parallel to the vehicle body center axis 2c on the axis displaced in the horizontal direction with respect to the vehicle body center axis 2c. Can be stored. The workbench 10 is pivotally attached to the tip of the second boom 6 so that the workbench 10 can swing freely. The center of swinging of the workbench 10 is also displaced upward from the vehicle center axis 2c in the drawing of FIG. The base 10 is stored on the vehicle body by turning 90 degrees clockwise.

With this configuration, when the high-altitude work apparatus 1 is stored, the base end of the second boom 6, the upper end of the swivel base 4, and the upper end of the workbench 10 are arranged on substantially the same horizontal plane. Therefore, the height of the work implement 1 and the height of the vehicle can be kept low, and the device can be compactly stored on the vehicle body 2. In the above embodiment, the boom having the parallel link mechanism is shown as the first boom 5, but the present invention is not limited to such a boom, and the boom can be expanded and contracted in a mono-boom configuration or in a nesting type. A telescopic boom configuration is also possible. Further, it goes without saying that the disposition position of the tool box is not limited to the side of the vehicle body shown in the above embodiment.

[0024]

As described above, as in the present invention, the turning center of the swivel base is positioned on the center axis of the vehicle body, and the boom is stored in parallel to the center axis of the vehicle body. In addition to being able to secure the same degree, it is possible to secure a sufficient loading space for the workbench and the storage means such as tools, so that the vehicle can be made compact. Further, in a side view, the first boom and the second boom are stored in a zigzag shape or an X shape on the vehicle body obliquely downward from the swivel base, and the limited space is effectively used. Therefore, the overall height of the vehicle when the work device is stored can be made extremely low, and the lift of the work table during work can be maintained high. Then, a full swing angle of 360 degrees is secured with the first boom raised, and the connecting portion of the first boom and the second boom is made higher than the height of the storage means so that the second boom can be raised and lowered. Therefore, it is possible to avoid interference between the boom and the storage means such as the tool box during work,
Even low-level work around the vehicle is possible. Therefore, the work range can be widened and workability can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing an aerial work vehicle according to the present invention.

FIG. 2 is a top view showing an aerial work vehicle according to the present invention.

FIG. 3 is a schematic view showing an aerial work state by the aerial work vehicle.

FIG. 4 is a graph showing a work range of an aerial work vehicle according to the present invention in relation to a conventional aerial work vehicle.

[Explanation of symbols]

 1 High-altitude work device 2 Vehicle body 3a, 3b Storage means (tool box) 4 Revolving base 5 1st boom 6 2nd boom 7 Connecting member 10 Workbench 11 Operation lever

Claims (4)

[Claims] 1. A swivel mounted on a vehicle body so as to be horizontally swivel, a first boom mounted on the swivel so as to be able to rise and fall, and offset at least horizontally with respect to a central axis of the first boom. Aerial work having a second boom which has a central axis line and which is flexibly attached to the tip of the first boom, and a workbench attached to the tip of the second boom. In the vehicle, the first boom extends obliquely downward from the upper portion of the swivel base toward the front, and the second boom has the first boom.
An aerial work vehicle, wherein the working device is configured to extend obliquely downward from the tip of the boom toward the rear and to be stored on the vehicle body. 2. A swivel mounted horizontally on the vehicle body, a first boom mounted on the swivel so as to be able to rise and fall, and a connecting member mounted at the tip of the first boom. A second boom that has a central axis line that is offset at least in the horizontal direction with respect to the central axis line of the first boom via a connecting member and is flexibly attached to the first boom, and is attached to the tip of the second boom. An aerial work vehicle including a work device having a work table provided with the work table, the first boom extending obliquely downward from the upper part of the swivel base toward the front, and the lower end of the connecting member at the tip portion. The second boom is pivotally connected to the connecting member above the pivot point between the first boom and the connecting member, and extends obliquely downward from the connecting member toward the rear, Aerial, wherein the first boom and the second boom is configured to be stored on the vehicle body become X-shape in a plane view. 3. A swivel mounted horizontally on the vehicle body, a first boom erected on the swivel, and offset at least horizontally with respect to the central axis of the first boom. Aerial work having a second boom which has a central axis line and which is flexibly attached to the tip of the first boom, and a workbench attached to the tip of the second boom. In the vehicle, the turning center of the swivel base is located on a vehicle body central axis extending back and forth in the center of the vehicle body in the width direction, and the first boom and the second boom are the vehicle body central axis line in plan view. An aerial work vehicle characterized by being configured to extend parallel to and to be stored. 4. The aerial work vehicle according to claim 1, wherein the first boom comprises a parallel link mechanism.