JPH09267994A - Vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the overall height of a vehicle low for housing by extending a telescopic boom obliquely downward from an upper part of a swivel base to a front part of a load-carrying platform so as to fall a head pin between a position of a foot pin and a position of a rod pin and a bottom pin of a boom cylinder. SOLUTION: At the time of housing a boom 13 after concluding the work at a height, the boom 13 is full shrunken, and a swivel base 12 is turned so that a tip part of a tip boom 13c is positioned at a central part in the car width direction in front of a load-carrying platform 11a, and the boom 13 is fallen so as to be extended obliquely downward from an upper part of the swivel base 12 to a front part of the load-carrying platform. At this stage, since the foot pin 20 and a falling cylinder 15 form a link, boom speed is extremely changed in response to a boom angle, then, height of a head pin 18 from the load-carrying platform is set so as to be positioned between the height of the rod pin 15a and the bottom pin 15b of the boom cylinder 15 and the height of the foot pin 20. With this structure, overall height of a car body at the time of housing can be restricted low.

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 provided with a work device such as a boom on a loading platform at the rear of a vehicle body, and more specifically, to a retracted posture of the boom work device when the aerial work vehicle travels and moves. It is about.

[0002]

2. Description of the Related Art In such an aerial work vehicle, a swivel base is arranged on the vehicle body, and a boom is arranged on the swivel base so that the boom can be undulated and extended. A workbench is always held horizontally at the tip of the boom, and a worker rides on the workbench. Then, the operator is moved to a predetermined high place together with the work table by the turning operation of the swivel, the raising and lowering of the boom, and the extension / contraction operation to perform work at high places. When the work at a high place is completed, the boom is laid down at a position extending toward the front of the vehicle body, and the boom tip and the workbench are stored and held so that they are located above the operation cabin. In the state where the work vehicle is stored as described above, the worker is allowed to board the driving cabin and run the work vehicle.

Further, conventional aerial work vehicles are often manufactured by using the body of a truck, a driving cabin is provided at the front of the body, and a swivel is provided on a frame at the rear of the body. Was there. Therefore, when the boom and workbench are stored on the vehicle body as described above, the tip of the boom and the workbench attached to it are located above the operating cabin, and the total height of the aerial work vehicle is high. In some cases, the height becomes higher, and there is a problem of height limitation when traveling, and there is a problem of traveling stability.

[0004]

In order to solve this problem, it is possible to store the boom and workbench just behind the driving cabin (front of the vehicle body) to reduce the overall height of the aerial work vehicle. However, in this case, the boom length cannot be increased, and there is a problem that it is difficult to secure a wide working range when working at a high place. Also, in order to lower the vehicle height, a so-called cab-back turntable type is used in which the swivel is located just behind the driving cabin (front of the vehicle body), and the so-called upper pin type in which the swivel is pivotally attached to the upper surface of the boom. In this case, the turntable becomes large and the weight increases, and the work radius of the boom cannot be set in front of the vehicle body, so that the work range of the boom is extremely limited. Furthermore, the total height of the aerial work vehicle is mostly determined by the relationship between the workbench and the boom. In particular, the maximum lift is a straight extension type that exceeds 13 meters (a boom is composed of a single bend The height of the workbench during storage of the aerial work vehicle (of the type that does not have the) was often the entire height of the vehicle.

The present invention has been made in view of the above circumstances, and the swivel base is provided on the luggage carrier at the rear portion of the vehicle body.
The total number of booms is shortened while increasing the number of boom stages to ensure the extension length, and the boom extends diagonally downward from the upper part of the swivel base at the rear of the vehicle toward the front of the vehicle. By storing the vehicle on the vehicle body, the compact height that can be stored with the vehicle height kept low without sacrificing the lifting range of the workbench installed at the tip of the boom and the boom working range in front of the vehicle body The purpose is to provide a work vehicle.

[0006]

In order to achieve the above object, an aerial work vehicle according to the present invention includes a swivel base which is rotatably arranged on a cargo bed at a rear part of a vehicle body on a rear side of a vehicle driving cabin. A telescopic boom whose base end is pivotally attached to the upper part of the swivel base by means of a foot pin and is configured to be able to move up and down, and is arranged between the telescopic boom and the swivel base. Each of the telescopic cylinders has a hoisting cylinder that is pivotally attached to perform hoisting operation of the telescopic cylinder, and a work table that is provided at the tip of the telescopic boom so that it can be rocked at least in a vertical plane by a head pin. ing. In the aerial work vehicle according to the first invention, the telescopic boom is laid down and stored on the vehicle body. The telescopic boom extends from the upper portion of the swivel base to the front portion of the vehicle body (right behind the operating cabin). It extends obliquely downward toward the top of the cargo bed, and the head pin is stored by being laid down to a position below the foot pin position and above the rod pin and bottom pin positions.

Further, the aerial work vehicle according to the second aspect of the invention is configured to have the same swivel base, telescopic boom, and work platform as in the first aspect of the invention. The telescopic boom is rotatably pivoted at the lower end of the base end of the telescopic boom via a swivel base and a foot pin, and is slanted downward from the upper part of the swivel base toward the front of the vehicle body. It is characterized in that it extends and is stored while being folded down until the upper end of the workbench is below the upper surface of the base end of the telescopic boom.

In the aerial work vehicle constructed as described above, when the boom is retracted, the tip of the boom is stowed and stowed toward the front of the vehicle body with a depression angle. Even when the vehicle is provided, the overall height of the vehicle body when stored can be kept low.
Further, since the workbench and the boom are located on the loading platform at the rear of the vehicle driving cabin, the workbench does not project outward from the entire length of the vehicle body, and the outer diameter of the aerial work vehicle when the boom is stored can be reduced. Further, since the swivel base is arranged at the rear part of the loading platform so that the boom extends on the loading platform in front of the vehicle body, even if the boom is tilted forward, it does not interfere with the driving cabin. Therefore, the working radius is not restricted, and the distance from the turning center to the front jack is long, so that a wide working range can be secured.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the first invention according to the present application will be described below with reference to FIG.
In this aerial work vehicle 10, a driving cabin C is arranged in the front part of a vehicle body 11 and a cargo bed 11a is arranged in the rear part.
On the loading platform 11a, a swivel platform 12 which is capable of horizontally swiveling with respect to the vehicle body 11 is attached. A boom 13, which is configured to telescopically extend and retract, is pivotally attached to the upper portion of the swivel base 12 so that the boom 13 can extend and retract about a foot pin 20 by the extension and lowering of a hoisting cylinder 15. The hoisting cylinder 15 and the boom 13 are connected to each other by the rod pin 15a by the hoisting cylinder 15 and the swivel base 1.
2 are pivotally attached to each other by a bottom pin 15b.

When the boom 13 is normally retracted (when fully retracted), the total length of the boom 13 is shortened to the length of the vehicle body or less, and the height of the boom is increased during high-altitude work to ensure a wide working range. It has a three-stage configuration including an intermediate boom 13b and a tip boom 13c. The expansion / contraction operation of the boom 13 is performed by the expansion / contraction operation of an expansion / contraction cylinder (not shown) arranged in the boom 13.

At the tip of the tip boom 13c, the boom 13
The head pin 1 maintains a vertical state at all times by a leveling mechanism (not shown) regardless of the undulation angle of the head pin 1.
A vertical post 16 is arranged so that it can be swung (rotated in a vertical plane) freely. An arm member 17 is attached to the vertical post 16 so as to be horizontally rotatable.
Is attached. An operator can board the work table 14 to perform work.

At the time of working at a high place, the boom 13 is lifted and retracted, and the swivel base 12 is swung as shown by the chain double-dashed line in FIG. Can be moved to a higher place. Further, by performing the turning operation of the arm member 17, it is possible to finely adjust the moving position of the workbench 14 after moving to a high place.

In the aerial work vehicle 10 constructed as described above, the outrigger jacks 19 are provided at four positions on the front, rear, left and right of the luggage carrier 11a in order to ensure the stability of the vehicle body 11 during aerial work. ing. This outrigger jack 1
9 is configured to be expandable / contractible toward the side of the loading platform 11a and expandable / contractible toward the lower side of the vehicle body (in the direction of the ground). Then, when the boom 13 is used, each outrigger jack 19 is extended toward the side of the vehicle body 1 and is extended downward of the vehicle body 11 as indicated by a chain double-dashed line in FIG.
The vehicle body 11 is stably supported by grounding.

In order to retract the boom 13 after finishing work at a high place, the boom 13 is fully retracted and then the swivel base 1 is moved.
2 is swung so that the tip of the tip boom 13c (the position where the head pin 18 is attached) is located in front of the platform 11a and in the center in the vehicle width direction. Then, it is laid down to a state in which it extends obliquely downward (having a depression angle) from the upper part of the swivel base 12 toward the front part of the loading platform 12a. Since the boom 13 is pivotally attached to the upper part of the swivel base 12 at the base end portion thereof, the height of the head pin 18 from the luggage carrier 11a is sufficiently lower than the height of the foot pin 20 from the luggage carrier 11a. You can lie down. At this time, the height of the head pin 18 from the bed is arranged between the height of the rod pin 15a and the bottom pin 15b of the undulating cylinder 15 and the height of the foot pin 20. This is because, due to the relationship of the link formed by the foot pin 20 and the hoisting cylinder 15, the hoisting speed extremely changes depending on the hoisting angle.

Before this fall, the arm member 1
7 is turned to the right, and further the workbench 14 is turned to the right so as to be substantially parallel to the boom 13. As a result, the boom 13 and the workbench 14 are in the most compact state in plan view and side view and are stored on the cargo bed 11a.

As described above, in the aerial work vehicle 10 according to the first aspect of the present invention, the boom 13 has the front loading platform 11a of the vehicle body 11.
Since the work platform 14 is stored in a state in which the work platform 14 is obliquely lowered, even when the work platform 14 is disposed at the tip of the boom 13 via the vertical post 16, the work platform 10 of the aerial work platform 10 in the stored state is shown. Overall height can be kept low. Further, unlike the case where the swivel base 12 is arranged in front of the vehicle body 11, even if the overall height of the vehicle body is kept low, the boom working range in front of the vehicle body 11 is not reduced, and the distance from the turning center to the front jack 19a is increased. Therefore, a wide working range can be secured.

An embodiment according to the second invention of the present application will be described with reference to FIG. This aerial work vehicle 30 does not differ in basic structure from the aerial work vehicle 10 according to the first invention, and therefore, the same components will be denoted by the same reference numerals. However, it is configured as a so-called lower pin type boom in which the lower portion of the base end portion of the boom 13 which is telescopically extendable and retractable and the upper portion of the swivel base 12 are rotatably pivoted by a foot pin 21 so as to be capable of undulating operation. This is different from the aerial work vehicle 10 described above.

In order to retract the boom 13 after the work at a high place is completed by the aerial work vehicle 30 thus constructed, the boom 13 is fully retracted and then the swivel base 12 is moved to the tip boom. The front end of 13c is swung so as to be located in front of the loading platform 11a and at the center in the vehicle width direction. Then, it is laid down to a state in which it extends obliquely downward (having a depression angle) from the upper part of the swivel base 12 toward the front part of the loading platform 12a. Boom 1
3, the lower end of the base end is pivotally attached to the upper part of the swivel base 12, so that the upper end 14a of the workbench 14 is lower than the upper end 13d of the base end of the boom 13 in a fully collapsed state. Can be laid down to. Also in this case, similarly to the first invention of the present application, the height of the head pin 18 from the bed is located between the height of the rod pin 15a and the bottom pin 15b of the undulating cylinder 15 and the height of the foot pin 20. It is desirable to do.

Before this fall, the arm member 1
7 is also turned to the right, and the workbench 14 is also turned to the right so that it is substantially parallel to the boom 13. As a result, the boom 13 and the work table 14 are in the most compact state in plan view and side view, and are stored and placed on the platform 11a. As described above, in the aerial work vehicle 30 according to the second aspect of the present invention, the boom 13 is stored in a state of being lowered obliquely downward toward the front of the vehicle body 11. Therefore, the upper end portion 14a of the workbench 14 is extremely low. The height of the work vehicle 30 in the stored state can be drastically reduced.

[0020]

As described above, in the aerial work vehicle according to the present invention, when the boom is stowed, the tip of the boom is stowed and stowed toward the front of the vehicle with a depression angle, so that the tip of the boom is stowed. Even when the workbench is provided, the overall height of the vehicle body when stored can be kept low. Further, since the workbench and the boom are located on the loading platform at the rear of the vehicle driving cabin, the workbench does not project outward from the entire length of the vehicle body, and the outer diameter of the aerial work vehicle when the boom is stored can be reduced. Further, in the first invention, since the position of the head pin is configured to be between the position of the foot pin and the positions of the rod pin and the bottom pin during storage, the undulating speed does not change extremely depending on the undulating angle, There is no anxiety for workers.

Further, since the swivel is arranged at the rear of the loading platform so that the boom extends above the loading platform at the front of the vehicle body, even if the boom is tilted forward, it is less likely to interfere with the vehicle driving cabin, and the operating cabin can There is no regulation on the boom working radius. Further, since the distance from the turning center to the front jack is long, a wide working range can be secured.

[Brief description of drawings]

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

FIG. 2 is a side view of an aerial work vehicle according to a second invention of the present application.

[Explanation of symbols]

 10, 30 Aerial work vehicle 11a Loading platform 12 Swiveling platform 13 Boom 15 Elevating cylinder 15a Elevating cylinder rod pin 15b Elevating cylinder bottom pin 18 Head pin 20, 21 Foot pin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Teru Sasaki 10 at 1152 Yamashita, Ryoke, Ageo City, Saitama Prefecture Aichi Corporation Ageo Factory

Claims (2)

[Claims] 1. A swivel rotatably arranged in the rear of a loading platform behind a vehicle driving cabin, and a telescopic boom whose base end is rotatably pivoted to the upper part of the swivel by a foot pin. A hoisting cylinder disposed between the telescopic boom and the swivel base, pivoted by the swivel base and the bottom pin by the telescopic boom and the rod pin to perform the hoisting operation of the telescopic boom, and a head pin at the tip of the telescopic boom. An aerial work vehicle configured to have at least a work platform that is swingably arranged in a vertical plane, wherein the telescopic boom extends from an upper portion of the swivel base to a front portion of the loading platform. The head pin is slanted downward and is laid down so as to be located between the position of the foot pin and the positions of the rod pin and the bottom pin of the undulating cylinder. An aerial work vehicle characterized by being stored on a loading platform. 2. A swivel rotatably arranged in a rear portion of a loading platform behind a vehicle driving cabin, and a telescopic boom in which a lower end of a base end portion is rotatably pivoted to the swivel by a foot pin. An aerial work vehicle having a work platform at which a tip of the telescopic boom is freely swingable in a vertical plane by a head pin, wherein the telescopic boom is the swivel platform. Of the work platform and the work platform and the telescopic boom, the work table and the telescopic boom are extended until the upper end of the work platform is below the base end upper surface of the telescopic boom. An aerial work vehicle characterized by being stored on a loading platform.