JP2001106489A - Working table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a working table from deformation and facilitate replacement of a handrail guard. SOLUTION: The handrail guard 39 is provided at the periphery of an upper handrail 33a made from rectangular steel pipe installed at the upper edge of the working table 30, in a position below the upper handrail 33a. The handrail guard 39 includes a guard member 41 arranged along the periphery of the upper handrail 33a and a connection member 43 to connect the guard member 41 with the upper handrail 33a, wherein the mechanical strength of the guard 39 is lower than that of the handrail 33. The connection member 43 has an arm 45 and a mounting/removing member 47 attached to its tip and having an elastic rubber piece, through which the arm 45 is connected with the upper handrail 33a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workbench, and more particularly, to a workbench having a handrail guard disposed along an outer periphery of an upper edge of the workbench to protect the workbench.

[0002]

2. Description of the Related Art An aerial work vehicle for performing aerial work is composed of a pair of crawler traveling bodies provided in a vehicle body width direction, a boom provided on a vehicle body and capable of extending, retracting, undulating, and turning; There is one provided with a work table provided and a worker can board. In order to allow the worker to get on and off the platform in this aerial work platform, the boom is retracted, the robot is moved down, the platform is placed on the ground, and then the worker on the ground rides on the platform, or An operator on the platform descends from the platform to the ground.

Here, there is a work table of a type in which a peripheral wall of the work table is formed by connecting rod-shaped iron pipes. In the work table using this iron pipe, the iron pipe arranged at the upper end of the work table has a function as a handrail of an operator. However, if the work table collides with an obstacle while the worker on the work table is holding his hand on the iron pipe, the worker's hand may be injured. Therefore, in order to protect the hands of the workers, there has been already proposed a work table provided with a handrail guard made of an iron pipe along the outer periphery of the upper edge of the work table.

By providing the handrail guard, even if the work table collides with an obstacle while the worker is holding the iron pipe, the handrail guard collides with the obstacle first. Hands can be protected.

[0005]

However, if the handrail guard repeatedly collides with an obstacle or collides with a large force, the handrail guard is greatly deformed and the original function of the handrail guard cannot be exhibited. In addition, there is a possibility that the iron pipe forming the peripheral wall of the work table is deformed. Further, since the handrail guard is welded to the iron pipe forming the peripheral wall of the workbench, there is a problem that it is difficult to remove and replace the handrail guard from the iron pipe.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a work table which can prevent the work table from being deformed and can easily replace the deformed handrail guard. I do.

[0007]

In order to solve the above-mentioned problems, a work table according to the present invention comprises a lifting device (for example, a telescopic device in the embodiment) which moves up and down at least with respect to a base (for example, a vehicle body 3 in the embodiment). A workbench provided on the boom 17), which has a protection portion (for example, a handrail guard 39 in the embodiment) provided along an outer periphery of an upper edge of the workbench to protect the workbench; The part is detachable from the worktable, and the mechanical strength of the protection part is lower than the mechanical strength of the worktable.

[0008] When the work table is erroneously moved in the direction approaching the obstacle due to the operation of the elevating device and collides with the obstacle, the protection unit of the work table first collides with the obstacle. At this time, since the mechanical strength of the protection unit is weaker than that of the worktable, the protection unit is deformed first, and the colliding energy is absorbed by the protection unit. For this reason, the magnitude of the force acting on the work table is reduced, and the deformation of the work table can be reduced. Also,
Even if the protection part is greatly deformed, the protection part can be easily attached to and detached from the work table, so that the protection part can be easily replaced.

In the above-mentioned workbench, the protection portion has a connection portion (for example, the connection member 43 in the embodiment) connected to the workbench, and the connection portion has an elastic body (for example, the rubber 51 in the embodiment). It may be configured so that the connecting portion is connected to the worktable via an elastic body. When the connecting part is connected to the workbench via the elastic body, when an obstacle collides with the protection part, the energy at the time of the collision is also absorbed by the elastic body, and the magnitude of the force acting on the workbench is increased. And the deformation of the worktable can be further reduced.

[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 an embodiment of a self-propelled aerial work vehicle having a pair of crawler-type lower traveling bodies at both left and right ends of a vehicle body. As shown in FIG. 1, the aerial work vehicle 1 has a pair of crawler-type lower traveling bodies 5 at both left and right ends of a vehicle body 3. The lower traveling body 5 is provided on the crawler belt 7, a starting wheel 9 provided inside the crawler belt 7 for driving the crawler belt 7, and on a rear side of the crawler belt 7 for guiding the crawler belt 7. And a traveling motor (not shown) provided inside the starting wheel 9 for rotating the starting wheel 9.

A turntable 13 is provided on the vehicle body 3 so as to be freely rotatable, and a turn motor (not shown) is provided in the vehicle body 3 below the turntable 13. It is configured to be. Swivel 13
A recess 15 is provided in the middle of the vehicle body 3 in the front-rear direction of the vehicle body 3.
The recess 15 is formed so that the telescopic boom 17 in the fully contracted state can be stored. The telescopic boom 17 is configured to be extendable and retractable, and the base of the telescopic boom 17 is pivotally connected to the inside of a pair of pivoting plates 19 projecting upward from the upper part of the rear part of the vehicle body. An up / down cylinder 21 is pivotally connected therebetween. The telescopic boom 17 is configured to move up and down when the up-and-down cylinder 21 is extended and retracted.

At the tip of the telescopic boom 17, there is provided a work table 30 on which a worker can ride. The work table 30 has a plate-shaped bottom plate 31 provided on the bottom, and a handrail 33 formed by connecting a plurality of iron pipes 32 projecting upward from a peripheral edge of the upper surface of the bottom plate 31. The worktable 30 will be described in more detail with reference to FIGS.
FIG. 2 is a plan view of the worktable 30, and FIG.
It is the front view which showed the principal part of No. 0. A horizontal arm 35 protruding outward is attached to the left side of the bottom plate 31 shown in FIG. 2, and the upper part of a vertical post 37 pivotally connected to the tip of the telescopic boom 17 so as to be vertically swingable. Installed. A lower end of a vertical post 37 is pivotally connected to a distal end of a leveling cylinder (not shown) provided inside the distal end of the telescopic boom 17. This leveling cylinder operates in conjunction with the up-and-down operation of the telescopic boom 17, and the vertical post 3
7 is always kept vertical. Therefore, the work table 30 is always kept in a horizontal state. An operation device 23 for operating the vehicle and operating the telescopic boom 17 is provided on the upper handrail 33 a disposed above the horizontal arm 35. An operating device (not shown) is also provided on the side of the vehicle body 3 shown in FIG.

On the upper edge of the work table 30 shown in FIG. 2, there is provided an upper handrail 33a made of an iron pipe and formed in a rectangular shape. The upper handrail 33a is provided on the outer periphery of the upper handrail 33a.
A handrail guard 39 is provided at a position having a predetermined gap outward from 3a and having a predetermined separation dimension below the upper handrail 33a shown in FIG. The handrail guard 39 is made of an iron pipe.
A guard member 41 is provided along the outer periphery of the upper handrail 33a excluding the upper part of the horizontal arm 35, and the guard member 41 It has a plurality of connecting members 43 connected to the handrail 33a. The connecting member 43 includes both ends of the guard member 41, an intermediate portion of the guard member 41 extending in the left-right direction on the paper of FIG. 2, and upper and lower ends of the guard member 41 extending in the vertical direction of the paper of FIG. Are provided respectively.

As shown in FIG. 3, the connecting member 43 is inclined in such a manner as to gradually incline downward from the upper handrail 33a to the outside, and the connecting arm 45 and the connecting arm 45 shown in FIG. And an attaching / detaching member 47 attached to the distal end of the camera. The attachment / detachment member 47 is constituted by sandwiching rubber 51 which is an elastic body between two plate-shaped connection members 49, and the tip of the connection arm 45 is fixed to the center of one (lower) connection member 49. The upper surface of the other (upper) connecting member 49 is fixed to the upper handrail 33a. A plurality of bolts 53 are inserted between the upper handrail 33a and the attachment / detachment member 47 to be screwed. For this reason, the connection member 43 is detachable from the upper handrail 33a.

The connection arm 45 and the lower connecting member 49 are connected by welding, and the mechanical strength of the welded portion (hereinafter referred to as “welded portion 45a”) is higher than that of the connection arm 45. When an external force acts on the connection arm 45, the connection arm 45 is deformed first,
5a does not deform before the connecting arm 45.

The attachment / detachment member 47 can be configured as shown in FIG. As shown in the figure, the detachable member 55 has a pair of grip portions 59 in which a rubber 57 is fixed to a plate-shaped connecting member 49. Rubber 57
Is a circle for holding the guard member 41 to the iron pipe 32 by sandwiching the iron pipe 32 projecting upward from the bottom of the worktable when the pair of gripping parts 59 are opposed to each other so that the rubber 57 faces inward. It has an arc-shaped notch 61. At both ends of the pair of gripping portions 59, through holes (not shown) are formed to penetrate them, and female screws (not shown) are threaded at both ends of the connecting member 49 on one side (the rear side in FIG. 4B). Then, a bolt is inserted through the through hole so that one of the connecting members 4
9, the detachable member 55 can be fixed to the iron pipe 32. A connecting arm 45 is connected to the other connecting member 49 (on the near side in FIG. 4B) by welding. The relationship between the strength of the welding portion 45a and the strength of the connection arm 45 is the same as that described above, and a description thereof will be omitted.

Next, the operation of the work table 30 of the present invention will be described. First, an operator operates an operating device (not shown) provided on the vehicle body 3 with the telescopic boom 17 stored in the swivel base 13 shown in FIG. 1 to move the vehicle to a position near the work site. 17 is operated to ground the workbench 30 to the ground. Then, the worker gets on the work table 30,
The operator operates the operating device 23 provided on the worktable 30 to operate the telescopic boom 17 to move the worktable 30 to a desired position.

Here, if there is an obstacle during the movement of the work table 30, if the worker mistakenly moves the work table 30 in a direction to approach the obstacle without noticing the obstacle,
An obstacle 71 collides with the guard member 41 shown in FIG. When the collision force is large, the guard member 41 and the connection arm 45 are deformed. Since the mechanical strength of the welded portion 45a shown in FIG. 4A is greater than that of the connection arm 45,
The welding portion 45a is not deformed before the connection arm 45. A part or all of the energy due to the collision is absorbed by the deformation of the guard member 41 and the connecting arm 45 shown in FIG. 2, and the energy not absorbed by the guard members 41 and 45 is attached to the detachable member shown in FIG. 47 rubber 5
1 absorbs part or all of it.

Further, since the connecting arm 45 is inclined as shown in FIG. 3, a horizontal force F is generated by the collision of an obstacle.
Acts, a compressive force F1 in the direction of compressing the connection arm 45 acts and a force F2 for bending the connection arm 45 acts. That is, when a horizontal force F acts, a force F2 which is a part of the component force is applied to the connection arm 45.
Acts in the direction in which the connecting arm 45 is to be bent to deform the connecting arm 45. Therefore, the energy due to the collision of the obstacle is absorbed by the deformation of the connection arm 45. And the compression force F
1 deforms the rubber 51 shown in FIG. 4A to further absorb the energy due to the collision. As a result, the upper handrail 33
A little force acts on a, and deformation of the handrail 33 can be prevented. Even when the magnitude of the force F due to the collision is extremely large, the deformation due to the collision is absorbed by the deformation of the guard member 41, the connecting arm 45, and the rubber 51, so that the deformation of the handrail 33 can be reduced.

When the handrail guard 39 is significantly deformed and needs to be replaced, the bolt 53 shown in FIG. 4A is turned to unscrew the connection arm 45 and the connection arm 45 is moved to the upper handrail 33a. Let go. Thus, the detachable member 47
Since the connection arm 45 is detachably provided on the upper handrail 33a, the handrail guard 39 can be easily replaced.

In the above-described embodiment, the guard member 41 is not provided on the entire outer periphery of the upper portion of the worktable.
Are not provided above the vertical post 37 shown in FIG. This is because there is little possibility that an obstacle collides with the upper handrail 33a near the vertical post 37. However, in a worktable of a type in which the distal end of the telescopic boom 17 is pivotally connected to the center of the bottom surface of the bottom plate 31 of the worktable 30, the entire outer periphery of the worktable may collide with an obstacle. A guard member 41 is provided on the entire outer periphery. Thus, deformation of the entire outer periphery of the worktable can be prevented.

[0022]

As described above, according to the work table of the present invention, a protection section is provided along the outer periphery of the upper edge of the work table to protect the work table, and this protection section is detachable from the work table. And the mechanical strength of the protection unit is made weaker than that of the work table, so that even if the work table collides with an obstacle by mistake, the protection unit is deformed and absorbs the energy of the collision. The work table can be prevented from being deformed without a large force acting on the work table. Further, even if the protection part is greatly deformed, the protection part is detachable from the worktable, so that the protection part can be easily replaced.

Further, the protection section has a connection section connected to the work table, and the connection section has an elastic body. When the connection section is connected to the work table via the elastic body, the protection section has an obstacle. When an object collides, the energy at the time of the collision is also absorbed by the elastic body, so that the magnitude of the force acting on the worktable can be further reduced, and the deformation of the worktable can be further reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an aerial work vehicle having a workbench according to an embodiment of the present invention.

FIG. 2 is a plan view of a worktable according to the embodiment of the present invention.

FIG. 3 is a front view of a main part of a worktable according to the embodiment of the present invention.

4A and 4B show a connecting member according to an embodiment of the present invention. FIG. 4A is a plan view of the connecting member, and FIG.
FIG. 4 is a perspective view of a connection member.

[Explanation of symbols]

 3 Body (base) 17 Telescopic boom (elevating device) 30 Work table 39 Handrail guard (protection part) 43 Connection member (connection part) 51 Rubber (elastic body)

Continuing on the front page (72) Inventor Masato Ogawa 1152 Yamashita, Ryoji, Ryoke, Ageo City, Saitama Prefecture Inside Aichi Corporation Ageo Works (72) Inventor Fumiya Momose 1015, 1152 Yamashita, Ryoke, Ryoke, Ageo City, Saitama Prefecture Aichi Corporation Ageo Works Co., Ltd. (72) Inventor Masanobu Saito 1152 Yamashita, Ryoke Oji, Ageo City, Saitama Prefecture 10 Aichi Corporation Ageo Works Co., Ltd. (72) Inventor Motoaki Suda 1152, Ryokeji Yamashita, Ageo City, Saitama Prefecture Address No. 10 Aichi Corporation Ageo Works F-term (reference) 3F333 AA08 AB04 AC07 CA13 DA01 DA02 DA03 DB04 DB08 FG05

Claims (2)

[Claims] 1. A workbench provided on an elevating device that moves up and down at least with respect to a base, comprising a protection section provided along an outer periphery of an upper edge of the workbench to protect the workbench. A work table, wherein the protection section is detachable from the work table, and the mechanical strength of the protection section is lower than the mechanical strength of the work table. 2. The method according to claim 1, wherein the protection unit has a connection unit connected to the work table, the connection unit has an elastic body, and the connection unit is connected to the work table via the elastic body. The work table according to claim 1, wherein