JPH09278393A - Vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle for high lift work constituted in such a way that the weight of a tip side mast is reduced so as to be economical with little waste, that a work object can be brought close to the upper face of a workbench without the tip side mast interfering with the work object so as to improve safety and work efficiency, that these advantages are easily realized and that there is no risk of a base end side mast and an intermediate mast protruding into the workbench. SOLUTION: In this vehicle for high lift work 12, a horizontal workbench 3 is attached onto an under carriage 2 in such a way as to be vertically elevated by elevating mechanism 13. In this elevating mechanism 13, a plurality of vertical cylindrical masts are formed into mutually telescopic structure and longitudinally expandable on the whole, and the base end side mast 5 is fixedly erected on the under carriage 2. As to the tip side mast 14, the side part of the workbench 3 is fittingly fixed close to its upper end 15 which is opened, and the length is set shorter than the base end side mast 5 and the other mast.

Description

Detailed Description of the Invention

[0001]

[0001] The present invention relates to an aerial work vehicle. That is, the present invention relates to an aerial work vehicle in which a workbench is mounted on a chassis so that the workbench can be raised and lowered.

[0002]

2. Description of the Related Art FIGS. 3, 4 and 5 are provided for explaining a conventional example of this kind. 3 (1) is a side view of essential parts showing the elevating mechanism and the like in an extended state, and FIG. 3 (2) is a plan sectional view of the elevating mechanism. 4 (1) is an overall side view showing the elevating mechanism and the like in an extended state, and FIG. 4 (2).
The figure is an overall front view showing the elevating mechanism and the like in an extended state. FIG. 5 is used for explaining another conventional example of this kind. FIG. 5 (1) is an overall side view showing an elevating mechanism in an extended state, and FIG. 5 (2) is an elevating mechanism in an extended state. It is the whole front view which shows etc.

In this type of aerial work vehicle 1, a horizontal work table 3 is mounted on a chassis 2 so as to be vertically movable by a mast type lifting mechanism 4. Further, the elevating mechanism 4 has a structure in which a plurality of vertical cylindrical masts form a nesting structure between each other, and can be extended and contracted vertically in general.
A base mast 5 that is a first mast that is fixedly erected on the chassis 2; an intermediate mast 6 that is a second mast that can be externally fitted to the base mast 5; And the work table 3 is attached and fixed to the lower portion of the front end mast 7.
Then, in the lifting mechanism 4 of the aerial work vehicle 1 of this type of conventional example, the proximal mast 5, the intermediate mast 6, and the distal mast 7 are provided.
Are made of the same material and have the same wall thickness, and are formed into a rectangular pipe shape having substantially the same length, and the diameter of the lower mast is smaller in the order of the base end side mast 5, the intermediate mast 6, and the front end side mast 7. In the figure, 8 is a handrail of the workbench 3, 9 is a crawler for traveling the chassis 2, and A and B are orthogonal beam portions to be worked.

[0004]

The following problems have been pointed out in such a conventional example. First of all, in the lifting mechanism 4 of the conventional aerial work vehicle 1 described above,
The outer tip side mast 7 has the largest diameter, the largest size and the heaviest weight, while the inner diameter, the smallest diameter, the smallest and the smallest the base end side mast 5 receives the largest bending force and axial force in terms of strength. It receives the largest bending load in the horizontal direction and vertical load in the vertical direction. Therefore, it has been pointed out that the tip side mast 7 is wasteful of weight and is uneconomical. Further, this causes the entire vehicle to be heavier and the load capacity to be reduced, and the center of gravity is high and the traveling stability is high. Problems such as lack of sex were pointed out.

Secondly, the upper portion 11 of the distal end side mast 7 is likely to interfere with the work target during high-altitude work, is an obstacle and is dangerous, and the worker on the workbench 3 is forced to take an unreasonable posture. There were problems such as this pointed out. For example, as shown in FIG. 5, using the aerial work vehicle 1 provided with the space 10 where the handrail 8 does not exist on the workbench 3 facing each other, the beams A and B of the steel structure orthogonal to each other in the horizontal plane are worked. As a target, the following problems occurred when working in high places. That is, the upper portion 11 of the tip-side mast 7 that largely protrudes on the workbench 3 easily interferes with the beam portion A to be worked, becomes an obstacle, and is dangerous.
The beams A and B cannot be brought close to the upper surface of
Therefore, it was pointed out that the worker on the workbench 3 was forced to work in a stretched and unreasonable posture, and the work efficiency was poor.

The present invention has been made in view of such circumstances, and has been made to solve the problems in the above-described conventional example.
By removing the upper part of the tip side mast and setting it shorter than other masts, for example, by attaching and fixing a workbench near the upper end of such a tip side mast, firstly, the weight of the tip side mast is Is greatly reduced, and secondly,
It is an object of the present invention to propose an aerial work vehicle in which interference with a work target is avoided, and thirdly, these are easily and easily realized. Further, according to claim 3, by attaching and fixing the tip side mast to the outside of the workbench, in addition to the above, fourthly, it is also possible to prevent other masts from protruding into the workbench. The purpose is to propose a work vehicle.

[0007]

The technical means of the present invention for solving such a problem is as follows. First, claim 1 is as follows. That is, this claim 1
In the aerial work vehicle, a horizontal workbench is mounted on a chassis so that the workbench can be vertically lifted by a mast-type lifting mechanism. The elevating mechanism has a structure in which a plurality of vertical cylindrical masts form a nesting structure between each other, and is vertically expandable and contractable as a whole, and at least fixedly erected on the chassis. It comprises a base end side mast and a tip end side mast that can be directly or indirectly fitted into the base end side mast. Further, the distal end side mast is characterized in that the working table is attached and fixed and the length is set shorter than other masts such as the proximal end side mast.

Next, claim 2 is as follows. That is, the aerial work vehicle of claim 2 is characterized in that, in the aerial work vehicle of claim 1, the tip end mast has an upper end located near a mounting and fixing position of the workbench. To do. Claim 3 is as follows. That is,
An aerial work vehicle according to a third aspect of the present invention is the aerial work vehicle according to the first aspect, wherein the tip end mast is attached and fixed to the outside of the work table.

In the aerial work vehicle, when not in use, the elevating mechanism is telescopically shortened so that the workbench descends onto the chassis, and the proximal mast and other masts are fitted into the distal mast.
It is stored. Next, at the time of work at a high place, the lifting mechanism is extended and extended from the nested state, and the workbench is raised, so that work at a high place on the work target is carried out. In this aerial work vehicle, the tip side mast of the lifting mechanism is set shorter than other masts by removing the upper part, and, for example, near the upper end of such a tip side mast, the worktable The outside is attached and fixed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments of the invention shown in the drawings. FIG. 1 is provided for explaining a first example of an embodiment of the present invention. (1) is a side view of essential parts showing an elevating mechanism and the like in an extended state, and (2) is
FIG. 6 is a side view of a main part showing a lifting mechanism and the like in a shortened state. FIG.
For the explanation of the second example of the embodiment of the present invention, (1)
The figure is an overall side view showing the lifting mechanism etc. in the extended state,
(2) The figure is an overall front view showing the elevating mechanism and the like in the extended state.

First, the aerial work vehicle 12 will be generally described. In this type of aerial work vehicle 12, a horizontal workbench 3 is mounted on a chassis 2 so as to be vertically movable by a mast type elevating mechanism 13. The elevating mechanism 13 has a structure in which a plurality of vertical cylindrical masts form a nesting structure with each other, and are vertically expandable and contractable as a whole. At least,
It comprises a base end side mast 5 which is fixedly provided on the chassis 2 and a front end side mast 14 which can be directly or indirectly fitted into the base end side mast 5.

The above aerial work vehicle 12 will be described in more detail. First, a crawler 9 is used as in the illustrated example, or wheels (not shown) are used as the traveling means of the chassis 2 that is the traveling carriage. The crawler 9 has an endless shape on each of the left and right sides, and is stretched between the front and rear drive wheels and driven wheels on the left and right sides of the chassis 2, and the drive wheels are driven by a drive motor or the like to travel. When wheels are used as the traveling means instead of the crawler 9, the wheels are
It consists of front, rear, left and right drive wheels and driven wheels under the chassis 2, and the drive wheels are driven by a drive motor or the like to run, but a type using only free wheels without a drive source such as a drive motor. It is also possible.

Next, the elevating mechanism 13 interposed between the chassis 2 and the workbench 3 is, in the illustrated example, a vertical mast type of three masts, and is fixedly erected on the chassis 2. The first mast, which is the base end side mast 5, the second mast, which is the second mast that can be fitted onto the base end side mast 5, and the middle mast 6
And a tip side mast 14 that is a third mast that can be externally fitted. The base end side mast 5, the intermediate mast 6, and the tip end side mast 14 are in the shape of a square pipe of the same material and the same thickness. And hydraulic or pneumatic cylinders, wires, ropes,
By a drive mechanism (not shown) in which a chain or the like is combined, the tip side mast 14 is extended to the lower intermediate mast 6 and the proximal end mast 5, and the intermediate mast 6 is extended to the lower proximal end mast 5. -It is stretched and fits, stored and shortened by its own weight. By such an elevating mechanism 13, the workbench 3 is maintained in a horizontal state at all times, and is raised as shown in FIG. 1 (1), FIG. 2 (1), and FIG. 2 (2). And the descending position shown in FIG. 1 (2) are vertically moved. The aerial work vehicle 12 generally has such a structure.

In the work vehicle 12 for high places, the elevating mechanism 13 is as follows. That is, the work mast 3 is attached and fixed to the front end side mast 14 of the lifting mechanism 13, the upper end 15 is opened, and the length is set shorter than other masts such as the base end side mast 5. The tip side mast 14 is attached and fixed to the outside of the workbench 3, and the upper end 15 is located near the attachment and fixation position of the workbench 3.

The front end mast 1 of the lifting mechanism 13 as described above.
4 will be described in more detail. This tip side mast 14 is
This is made up of the above-mentioned conventional example of the front end side mast 7 removed (see comparison between FIG. 1 (1) and FIG. 3 (1)), and C in FIG. 1 (1). Indicates such a removal equivalent portion. Then, the upper end 15 is opened and the length is set to be much shorter than the proximal end side mast 5 and the intermediate mast 6. The outer side, that is, the base end of the workbench 3 is attached and fixed to the tip side mast 14 as described above.
In the example of FIG. 1, near the upper and lower center of the tip side mast 14,
In the example of FIG. 2, the upper surface of the workbench 3 and the upper end 15 of the tip side mast 14 are set at positions substantially flush with each other.

The present invention is constructed as described above. Then it becomes as follows. This work platform 12
Is the lifting mechanism 1 when not in use except when working in high places.
3 is telescopically shortened, the workbench 3 descends on the chassis 2, and the front end side mast 5 and the intermediate side mast 6 are attached to the front end side mast 14.
Are sequentially fitted and stored, and the proximal mast 5 and the intermediate mast 6
Has an upper end projecting upward from an open upper end 15 of the tip side mast 14. Next, when working at a high place, the elevating mechanism 13 extends from the above-mentioned nested state.
It is extended, the workbench 3 rises while maintaining the horizontal state,
For example, it is located at a position corresponding to the work target such as the beam portions A and B of the steel frame structure, and thus work at a high place from the work table 3 to the work target is performed. Then, in the aerial work vehicle 12, the upper portion of the distal end mast 14 of the lifting mechanism 13 is removed as the removal corresponding portion C, and the other proximal end mast 5 and the intermediate mast 6 are removed.
It is set shorter, and the outer side of the workbench 3 is attached and fixed near the lower end 15 of the tip side mast 14 as described above. Then, in this aerial work vehicle 12, the following first, second, third and fourth operations are performed.

First, in this aerial work vehicle 12, the tip side mast 14 of the lifting mechanism 13 is set to have a shorter length than the other base end side masts 5 and the intermediate masts 6, and the upper portion thereof is not loaded. Are removed (see the removal-corresponding portion C in FIG. 1A), and the weight is reduced accordingly. That is, in the distal end side mast 14, the upper part thereof, that is, the load from the workbench 3 and the load of the elevating mechanism 13 itself are not received, and the upper ends of the proximal end side mast 5 and the intermediate mast 6 are conventionally exposed. The upper portion, which merely prevents the above, is removed as a removal corresponding portion C, as compared with the above-described tip side mast 7 of the conventional example of this type (see FIG. 3A). As described above, in the tip side mast 14, as compared with the tip side mast 7 of this type of conventional example, only the upper portion that does not receive a load is removed, and there is no problem in terms of strength.

As described above, in the elevating mechanism 13, as compared with the inner proximal end mast 5 which receives the largest bending force and axial force, the largest lateral bending load and vertical vertical load. However, the tip side mast 14 having the same material, the same thickness and a larger diameter is set to be shorter and lighter in weight as described above. Therefore, the elevating mechanism 13 has a good balance between the strength surface and the weight surface, and the weight of the distal end side mast 14 does not become excessive compared with the proximal end side mast 5 which requires the highest strength. In this way, the lifting mechanism 13 is economical without waste of weight.

Secondly, in the aerial work vehicle 12, the front end mast 14 of the lifting mechanism 13 is set to be short, and in the illustrated example, the upper end 15 of the short front end mast 14 is set.
A workbench 3 is attached and fixed in the vicinity. This point
It is also said that the upper portion of the tip-side mast 14 is removed, but this does not cause the tip-side mast 14 to interfere with the work target during high-altitude work, so that the work target is set to the work table 3
It is possible to approach near the upper surface of.

For example, in the example shown in FIG. 2, the workbench 3 is provided with a space 10 in which the handrail 8 does not exist. And in such an aerial work vehicle 12,
Beam A of steel frame structure that is orthogonal to the horizontal plane of a building,
Even when performing high-altitude work with B as the work target, the beam portions A,
B can be brought close to the upper surface of the workbench 3 without any trouble. That is, the upper end 15 of the tip side mast 14 hardly projects onto the workbench 3, and the beam portion A that is the work target does not interfere with the tip side mast 14. Therefore, the beams A and B can smoothly approach the upper surface of the work table 3 while utilizing the space 10 where the handrail 8 does not exist, and the work from the work table 3 can be facilitated.

Thirdly, in this aerial work vehicle 12, the upper portion of the tip side mast 14 of the lifting mechanism 13 is removed as compared with the conventional example of this kind, so that the tip side mast 14 is moved to the other base side. The mast 5 and the intermediate mast 6 are set to have a shorter length, and the workbench 3 is attached and fixed near the upper end 15 of the mast 5 and the intermediate mast 6 to have a simple structure.

Fourthly, in this aerial work vehicle 12, the front end mast 14 of the lifting mechanism 13 is attached and fixed to the outside of the workbench 3. Therefore, when the work table 3 is lowered by shortening the elevating mechanism 13, the base end side mast 5 and the intermediate mast 6 project from the open upper end 15 of the front end side mast 14 outside the work table 3. Has become. That is, the upper end 1 of the tip side mast 14 on the workbench 3 side
The situation in which the base end side mast 5 and the intermediate mast 6 project from 5 does not occur.

First, in the illustrated example described above, the elevating mechanism 13 has a three-mast system of the proximal mast 5, the intermediate mast 6, and the distal mast 14, but the present invention is as follows. It is not limited to the illustrated example. That is, a two-mast type lifting mechanism 13 including the proximal mast 5 and the distal mast 14 is also conceivable. It is also possible to use a lifting mechanism 13 having a plurality of masts of four or more, which is provided with different masts.

Secondly, in the above-described illustrated example, the elevating mechanism 13 has a larger diameter in the order of the base mast 5, the intermediate mast 6, and the tip mast 14 in the order higher.
The upper mast was set to fit the lower mast, and the upper end 15 of the tip side mast 14 was open,
The present invention is not limited to such an illustrated example. That is, for example, the proximal mast 5, the intermediate mast 6,
In the order of the tip side mast 14, the higher the mast, the smaller the diameter,
An elevating mechanism 13 in which the upper mast is set in the lower mast is also conceivable. In this case, it is not essential that the upper end 15 of the tip side mast 14 be opened.

[0025]

As described above, the aerial work vehicle according to the present invention removes the upper portion of the tip side mast and sets it shorter than other masts. For example, in the vicinity of the upper end of such tip side mast. By installing and fixing the workbench, the following effects are exhibited.

First, the weight of the front end mast is greatly reduced. In other words, in this aerial work vehicle, the tip side mast is set shorter than the other masts, and the upper portion that does not receive the load is removed. The tip side mast has been made lighter and less wasteful and economical. As a result, the weight of the entire vehicle is reduced accordingly, the load capacity is increased, the center of gravity is lowered, and the running stability is improved.

Secondly, interference with the work target is also avoided.
In other words, in this aerial work vehicle, since the upper part of the tip-side mast is removed, the tip-side mast does not interfere with the work target when working at high altitudes, and the work target is placed near the upper surface of the workbench. Can be brought closer. Therefore, as in the above-mentioned conventional example of this kind, for example, when working at a high place where the beam portion of the orthogonal steel frame structure is the work target, the tip side mast does not get in the way, danger is avoided and safety is improved. In addition, the work efficiency is improved because the worker on the workbench is not forced to work in an unreasonable posture with the back stretched.

Third, and yet they are easily implemented. That is, this aerial work vehicle has a simple configuration in which the upper portion of the tip side mast is removed, and thus the above-described first and second points can be easily realized.

Further, according to the third aspect, the tip side mast is attached and fixed to the outside of the workbench, and in addition to the above, the following is obtained. Fourth, other masts are prevented from protruding into the workbench. That is, in the aerial work vehicle according to claim 3, when the lifting mechanism is shortened to lower the workbench, another mast may project from the tip side mast outside the workbench. However, on the side of the workbench where the worker is located, the other mast does not project from the tip side mast, and safety is secured from this aspect as well. As described above, the effects exhibited by the present invention are remarkably large, for example, all the problems in the conventional example of this kind are solved.

[Brief description of drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevational view of a main part showing an elevating mechanism and the like in an extended state for explaining an aerial work vehicle according to the present invention in a first example of an embodiment of the invention; ) The figure is a side view of essential parts showing the elevating mechanism and the like in a shortened state.

FIG. 2 is provided for describing a second example of the embodiment of the present invention,
(1) is a side view of the entire lifting mechanism and the like in the extended state, and (2) is a front view of the entire lifting mechanism and the like in the extended state.

FIG. 3 is a side view of a main part showing an elevating mechanism and the like in an extended state, and (2) is a plan sectional view of the elevating mechanism, for explaining the conventional example of this kind.

FIG. 4 is a side view of the whole of the lifting mechanism and the like in an extended state, and FIG.
FIG. 3 is an overall front view showing an elevating mechanism and the like in an extended state.

FIG. 5 is used to explain another conventional example of this kind, and FIG.
The whole side view showing the elevating mechanism and the like in the extended state, and (2) is the whole front view showing the elevating mechanism and the like in the extended state.

[Explanation of symbols]

 1 aerial work vehicle (conventional example) 2 chassis 3 workbench 4 lifting mechanism (conventional example) 5 base end side mast 6 intermediate mast 7 tip side mast (conventional example) 8 handrail 9 crawler 10 space 11 Upper part 12 Aerial work vehicle (of the present invention) 13 Lifting mechanism (of the present invention) 14 Tip side mast (of the present invention) 15 Upper end A Beam portion B Beam portion C Removal equivalent portion

Claims (3)

[Claims] 1. An aerial work vehicle in which a horizontal workbench is mounted on a chassis so that it can be vertically moved up and down by a mast type elevating mechanism, and the elevating mechanism has a plurality of vertical cylindrical shapes. The masts form a nested structure between each other and are vertically expandable and contractable as a whole, and at least the base end side mast fixedly erected on the chassis and the base end side mast directly or A distal end mast that can be fitted indirectly, the distal end mast having the working table attached and fixed, and having a length set shorter than other masts such as the proximal end mast. The aerial work vehicle characterized by being present. 2. The aerial work vehicle according to claim 1, wherein an upper end of the tip-side mast is located near a mounting and fixing position of the workbench. 3. The aerial work vehicle according to claim 1, wherein the tip side mast is attached and fixed to the outside of the work table.