JPH11278798A - Vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a link type vehicle for light lift work capable of enlarging the high lift work area by using stretch area at the maximum within a dimensional regulation about vehicle operation. SOLUTION: A base 11 is provided on a load carrying platform 3 in rear of a vehicle operating cabin 2, and a foot pin 12 for pivotally connecting the base 11 and a main arm 13 to each other is positioned at a diagonal vertex part of a stretch range formed by the dimensional regulation frame of the load carrying platform 3 and the vehicle, and a pivotal connecting pin 21a for connection to a working base 20 is arranged so as to be housed with the housing posture in a diagonal bottom part of the stretch range. A lower link arm 14 is provided in a lower part of the main link 13, and an upper link 15 is provided in an upper part thereof, and they are pivotally connected by an intermediate link arm 16 so as to form the balancing mechanism for the working base 20. With this structure, a vehicle for high lift work having enlarged working area within the dimensional frame of the vehicle is obtained.

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 equipped with a working device such as a boom on a carrier at a rear portion of a vehicle body, and more particularly to a link mechanism of a link type aerial work vehicle.

[0002]

2. Description of the Related Art In an aerial work vehicle, a base fixed or rotatable on a cargo bed of a vehicle body is provided, and a boom is provided on the base so as to be able to undulate (extend and retract, bend and extend). . At the end of the boom, a workbench is provided which is always held horizontally, and an operator rides on the workbench. Then, the worker is moved to a predetermined height together with the work table by the turning operation of the base, the raising and lowering of the boom, and the (expansion / contraction, bending / extension) operation, thereby performing the work at a high place. When the high altitude work is completed, the boom is lowered at a position extending forward or backward of the vehicle body, and the boom tip and the worktable are stored and held so as to be located above the operation cabin or behind the loading platform. In such a stored state, an operator gets on the driving cabin and runs the work vehicle.

[0003] Such aerial work vehicles are often manufactured using the body of a truck, and a driving cabin is provided at the front of the body, and a base is provided at the rear of the carrier of the body. There are many examples. And in such an aerial work vehicle, when the boom and the worktable are stored on the vehicle body as described above, the tip of the boom and the worktable attached to the boom are located above the driving cabin, The height of the aerial work vehicle has increased, and height restrictions during traveling travel have become a problem,
In some cases, running stability became a problem.

For this reason, a base is arranged on a carrier at the rear of the vehicle body, the number of steps of the boom is increased, and the total length of the boom is shortened while ensuring the length at the time of extension. In some cases, the workbench and the boom are stored on the vehicle body so as to extend diagonally downward toward the front of the vehicle body. However, in such a configuration, the structure becomes complicated and the price becomes high. Therefore, it is often a problem particularly in the case of an aerial work vehicle that is based on a small vehicle or a light vehicle having a small body size and does not have a very large required head. Was. In addition, there has been a strong demand for such lightly-equipped aerial work vehicles to secure a work area after being placed in the vehicle size frame of these small vehicles and mini vehicles.

[0005]

For this reason, in such a small type of aerial work vehicle of this type, a work table is provided at the tip of a telescopic boom that can be freely moved up and down, expanded and contracted, and the like, and the work table is horizontally supported. Instead of using a so-called single boom structure, which uses a leveling cylinder for
Due to the simplicity of the structure, a link-type aerial work vehicle that horizontally supports a work table using parallel links may be used.
However, in a conventional parallel link type aerial work vehicle using two parallel links, the entire parallelogram formed by the upper link arm, the lower link arm, and these contact points is accommodated in the vehicle size frame. Due to necessity, the dimensions of both arms could not be extended.

The state of the conventional link format will be described with reference to FIG. Each of the drawings in FIG. 4 schematically shows a side view of the aerial work vehicle. A cabin 2 for driving the vehicle is provided in front of the vehicle body, and a loading platform 3 is provided behind the cabin 2. When the height limit H and the length limit L are set by the restriction frame of the vehicle, the workable area of the working device at the time of storage is represented by the hatched area in each drawing. It should be noted that a base (slewing table), a work table, and the like on the loading platform are omitted here for ease of explanation.

First, FIG. 1 (a) shows a configuration in which the above-mentioned parallel link is formed in the hatched workable area. In this state, the length of the upper and lower link arms is shorter than the length of the diagonal line of the area. This length can be maximized by providing one link arm on a diagonal line of the area as shown in FIG. 3B. In this case, for example, other than forming a parallel link When one arm is arranged above the arm on the diagonal, the vehicle height becomes higher and exceeds the height regulation frame of the vehicle. Conversely, when the other arm is provided below, the floor of the cargo bed This causes interference with the surface (both are indicated by two-dot chain lines in FIG. 2B).
For this reason, the conventional link configuration often has the system shown in FIG. 1A, which means that the length of the arm (that is, the height of the worktable) is sacrificed in order to comply with the vehicle regulation frame. ing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a link-type aerial work vehicle that expands a work range by maximally and effectively using a vehicle size frame of each vehicle class. Is what you do.

[0009]

In order to achieve the above-mentioned object, a link-type aerial work vehicle according to the present invention is constituted by an upper surface of a carrier behind a driver's seat and a dimensional restriction frame for vehicle operation, and is used when the work platform is stored. As a method of maximally and effectively utilizing the mountable area in the above, means shown schematically in FIG. 3 is used. Here, FIG. 3 schematically shows a side view of a link type aerial work vehicle, similar to FIG. 4, and has the same mountable area as FIG. First, FIG.
This will be described with reference to FIG. In the present invention, as shown in this figure, the main arm 13 is provided on the diagonal line which is the longest in the mountable area, and the foot pin 12 is provided on the diagonal top, thereby maximizing the length of the main arm. A lower link arm 14 having one end pivotally connected to a base below the foot pin is provided below the main arm.
An intermediate link arm 16 pivotally connected to the main arm is provided at an intermediate portion in the longitudinal direction of the main arm, and the lower link arm 14 and the intermediate link arm 16 are pivotally connected, so that the base and the main arm 13, Lower link arm 1
Fourth, the intermediate link arm 16 constitutes a first link mechanism. The other end of the intermediate link arm 16 is further extended above a pivotal connection with the main arm 13 and is pivotally connected to an upper link arm 15 provided above the main arm 13. The other end of the upper link arm 15 and the distal end of the main arm 13 are pivotally connected to a worktable, where the main arm 13, the intermediate link arm 16, the upper link arm 15, and the worktable are connected by a second link. The mechanism is configured.
In this way, the link mechanism of the aerial work vehicle according to the present invention balances by forming two parallel links vertically above and below the main arm 13. Therefore, the work table attached to the link tip can be moved to an arbitrary height while maintaining the level.

The link structure is not limited to the parallel link shown in FIG. 3A, but may be such that the first link and the second link have a similar shape as shown in FIG. 3B, for example. Even with a simple link configuration, balancing can be achieved as in the case of the parallel link. Therefore, the work table attached to the link tip can be moved to an arbitrary height while maintaining the level. In addition, by adopting such a similar link configuration, the degree of freedom of design of each arm is increased, so that the configuration of each arm can be determined in consideration of the arrangement of other equipment such as a work table.

In this manner, the main arm 13 in the retracted state is provided on the diagonal line of the mountable range, the foot pin 12 is provided on the diagonal top, and the first arm is located on the base side (downward) with the main arm 13 as the center. Link the workbench side (upper)
The work table can be kept horizontal by providing two second and third link mechanisms in a similar manner. By raising and lowering the main arm 13 by the raising and lowering means, the work table can be raised and lowered to an arbitrary height while maintaining the horizontal position. By configuring the link mechanism in this manner, the mounting height is suppressed more than the two parallel links of the conventional means, and
It is possible to secure the same high head as when a link mechanism having the longest link arm is formed by the parallel links. That is, according to the configuration of the present invention, it is possible to obtain a link-type aerial work vehicle that expands the work range by maximally and effectively using the vehicle size frame of each vehicle class.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a link-type aerial work vehicle according to the present invention will be described below with reference to FIG. In the drawings, the same components are denoted by the same reference numerals throughout the drawings and will be described. The aerial work vehicle 1 according to the present invention is provided with a vehicle operation cabin 2 for driving a vehicle in front of the vehicle body, and an aerial work device 10 is disposed on a carrier 3 behind the vehicle operation cabin 2. . The aerial work apparatus 10 is configured by a link configuration schematically shown in FIG. 3, and in a state where the aerial work apparatus 10 is stored, the restriction frame H of the vehicle 1 shown by a two-dot chain line in FIG. It shows an example in which it is stored in × L.

A base 11 is fixed on the carrier 3, and a base end of a main arm 13 is pivotally connected to the top of the base 11 by a foot pin 12 so as to be able to move up and down. The foot pin 12 and the main arm 13 are disposed so as to pass on a diagonal line of the storage-possible mounting area constituted by the loading platform 3 and the size restriction frame of the vehicle, that is, to make the main arm length as long as possible. You. Below the main arm 13, there is provided a lower link arm 14, one end of which is pivotally connected to the base 11 by pins 14b so as to be able to move up and down substantially in the same plane as the up / down operation surface of the main arm. The other end is an intermediate link arm 16 pivotally connected to a longitudinally intermediate portion of the main arm 13 by a pin 16a so as to be swingable in substantially the same plane as the undulating operation surface.
Are pivotally connected by a pin 16b. In this manner, the base 11, the main arm 13, the lower link arm 14, and the intermediate link arm 16 are provided below the main arm 13.
The first link mechanism is configured in substantially the same plane as the undulating operation surface of the main arm.

On the other hand, above the main arm 13, one end is pivotally connected to the intermediate link arm 16 by a pin 16c, and the other end is connected to the workbench support member 21 by a pin 21b and is substantially the same as the swinging movement surface of the intermediate link arm. An upper link arm pivotably connected in the plane is provided, and a tip of the main arm 13 is supported by a workbench support member 21 by a pin 21a.
Has been connected with. And these two contacts 21a, 21
The workbench 20 is integrally connected to the workbench support member 21 having b, for example, in this embodiment. In addition,
Here, the workbench support member 21 is a member constituting the workbench 20, and is generally a concept including the workbench support member 21 in the case of a workbench. In this manner, at the upper part of the main arm 13, the main arm 13, the intermediate link arm 16, the upper link arm 15, the workbench support member 2
A second link mechanism is constituted by the four members in substantially the same plane as the first link. The first link and the second link are configured as parallel links or similar links, so that the two links form a paralleling mechanism connected by the intermediate link arm 16.

Further below the lower link arm constituting the double link mechanism, a hydraulic cylinder having one end pivotally connected to the base 11 by a bottom pin 17b and the other end pivotally connected to the tip of the main arm by a rod pin 17a. When the hydraulic cylinder 17 is operated to expand and contract, the main arm 13 is moved up and down around the foot pin 12 as a center of rotation. At this time, the work table 20 is maintained horizontal by the paralleling mechanism constituted by the two links as described above, and can work at any height. FIG. 2 shows the operation of the link mechanism when the undulating operation is performed as described above. In the figure, the state where the undulation angle of the main arm 13 is at the intermediate position is shown by practice, and the state at the time of storage and at the maximum undulation position is shown by a two-dot chain line. 1 and 2 showing an embodiment of the present invention show an example of a so-called twin-bucket type aerial work vehicle having two work tables on the near side and the far side of the drawing with a main arm interposed therebetween. I have.

As described above, the foot pin 12 is provided at the diagonal top of the mountable area, and the main arm 13 is provided on the diagonal line toward the diagonal bottom opposite to the foot pin 12 so that the arm length, that is, the work table The lift is maximized, and the lower part (base 11
Side), a second link is provided on the upper side (workbench 20 side), and the two links are connected to each other.
The mechanism for balancing the work table 20 is achieved after the body size is set within the vehicle size restriction frame (H × L). That is, according to the configuration of the present invention, it is possible to obtain a link-type aerial work vehicle that expands the work range by maximally and effectively using the vehicle size frame of each vehicle class.

In particular, the base 11 is provided immediately after the driving cabin 2 (in front of the loading platform 3), and the base 11 is arranged so that the foot pin 12 is overhanged above the vehicle driving cabin 2. By constructing the base 1
1 is provided on the main arm 1 in comparison with the case where
3 can be secured longer, so that the workable area can be more effectively utilized, and the work table can be raised in height.

In the above embodiment, an example is shown in which the links formed above and below the main arm are parallel links. However, for example, as shown in FIG. This can be achieved even if the second link is configured in a similar manner. Further, the example in which the base 11 is fixed to the vehicle body is shown, but the present invention is not limited to this method. For example, even if the base 11 has a turning mechanism that turns with respect to the vehicle body, good. Further, the workbench support member 21 may have a vertical post, and the workbench 20 may have a turning mechanism with respect to the vertical post in a horizontal plane.

[0019]

As described above, according to the aerial work vehicle according to the present invention, two links are formed up and down with respect to the main arm of the aerial work apparatus, and the work table is balanced by this link mechanism. Configure to do so. For this reason, it becomes possible to provide the main arm on the diagonal of the body mountable area defined by the carrier and the regulated size frame of the vehicle while suppressing the height of the work equipment at height, and as a result, within the same size frame It is possible to obtain a link-type aerial work vehicle having a high head with an expanded working range.

Further, a base of the high-altitude working device is provided immediately after the driving cabin, and a main arm is provided on a diagonal line of a mountable area defined by the loading platform and the vehicle's regulation dimension frame. By storing, it is possible to obtain a link-type aerial work vehicle with a high head that effectively utilizes the vehicle size frame of each vehicle class and expands the work range.

In particular, by disposing a foot pin that pivotally connects the base and the main arm to the upper part of the driving cabin so as to overhang, it is possible to effectively utilize the workable area. Therefore, a high-head link that maximizes the working range by maximally and effectively utilizing the vehicle size frame of each vehicle class without sacrificing the working area of the aerial work equipment in order to comply with the vehicle regulatory framework. It is possible to obtain an aerial work platform.

Further, the two link shapes formed up and down with the main arm interposed therebetween can be configured to be similar. In this case, the shape and size of each arm can be changed in consideration of the work table, other mounted objects on the vehicle body, and the like. That is, it is possible to increase the degree of freedom in design, and it is possible to achieve the same effect as the case where the present invention is configured by the parallel link.

[Brief description of the drawings]

FIG. 1 is a side view of an aerial work vehicle according to the present invention in a state where a working device is stored.

FIG. 2 is a side view showing an operation of the work vehicle high-altitude working device.

FIG. 3 is a schematic view showing a configuration of a link type aerial work apparatus according to the present invention. Among them, FIG. 1A is a schematic diagram in which the present invention is configured by two parallel links, and FIG. 2B is a schematic diagram in which the present invention is configured by similar links.

FIG. 4 is a schematic view showing a configuration of a conventional link-type aerial work vehicle. Among them, FIG. (A) shows a conventional parallel link type, and FIG. (B) shows an assumed diagram when a link arm is maximized in the conventional link type.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 work platform aerial vehicle 2 vehicle driving cabin 3 carrier 11 base 13 main arm 14 lower link arm 15 upper link arm 16 intermediate link arm 20 work platform

Claims (1)

[Claims] 1. A base provided on a cargo bed behind a cabin for driving a vehicle, and a base end is pivotally connected to the base so as to be able to move up and down. A pivoted main arm, a lower link arm pivotally connected to the base so as to be able to undulate within substantially the same plane as the undulating operation surface of the main arm, and a lower link arm disposed below the main arm; An upper link arm pivotally connected to the workbench and disposed above the main arm; and an intermediate portion of the main arm pivotally connected to an intermediate portion of the main arm so as to be swingable in substantially the same plane as the up-and-down operation surface of the main arm. An aerial work vehicle having an upper end portion pivotally connected to the upper link arm and a lower end portion having an intermediate link arm pivotally connected to the lower link arm.