JP2002326793A - Vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle for high lift work for general purpose allowing, usually, a deck to be widely utilized as in general transporting trucks and, when necessary, the deck to be moved to a specified height. SOLUTION: This vehicle for high lift work 1 is formed of, as a base, a truck having an operation cabin 2 at the front of a body and a deck 4 at the rear thereof. First masts 11 having base rails are installed on the right and left front end parts of the deck 4. Second to fourth masts 12, 13, and 14 are extendably inserted, in nest type, into the first masts 11. A lifting means formed of a telescoping cylinder 31 and chains 32 and 33 is installed between the masts, and a work bucket 50 is installed on the fourth mast 14 so as to form the vehicle for high lift work 1. The work bucket 50 is stored on the upper part of the deck 4, and the vehicle for high lift work for general purpose with a wide deck area can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-altitude vehicle having a driving cabin and a movable body, comprising a lifting device which can be raised and lowered and a work table mounted on the lifting device and on which an operator rides. Work vehicle.

[0002]

2. Description of the Related Art The above-mentioned aerial work vehicles are already widely used, and examples thereof include a boom-type aerial work vehicle and a vertical ascent / descent type aerial work vehicle. These aerial platforms are generally constructed on the basis of a truck chassis, and swing, undulate, extend and contract,
A lifting / lowering device, such as a boom-type lifting / lowering device that can bend and extend, and a vertical post-type lifting / lowering device that uses a telescopic boom that expands and contracts vertically, is installed. It is configured.

[0003] By the way, in such an aerial work vehicle, the movable range of the workbench (working range) is set using the entire fixed vehicle standard size frame on the assumption that it is always used for the aerial work.
In addition to high-altitude work vehicles dedicated to high-altitude work,
There is a so-called multipurpose aerial work vehicle that also secures other functions as a work vehicle, for example, a function of transporting luggage while limiting the work range to some extent.

In a multipurpose aerial work vehicle, a luggage carrier for loading luggage is provided behind the driving cabin, and a small boom type elevating device or vertical post type elevating device is provided between the driving cabin and the luggage platform or on the luggage platform. And a workbench is provided at the tip of the lift device.

[0005]

However, many conventional multi-purpose aerial lifting devices for aerial work vehicles are of a type in which the elevating device conventionally used for aerial work vehicles is miniaturized. Although it has a work area of a certain level and a certain work table area, the area occupied by the lifting device including the work table is still large, and there is a demand for more effective use of the load bed as a transport vehicle, and the height of the vehicle is high. It was pointed out that driving was difficult.

For example, in the case of a boom type elevating device, it is necessary to have a resistance to a moment acting on the boom in a boom posture in which the work table is moved to a position of a maximum working radius. However, there is a problem that the occupied area is increased due to an increase in size of the device. In addition, there is a problem in that a work platform is stored in an upper part of a driving cabin in order to reduce the occupied area on the vehicle body, and the overall height of the vehicle is high, and the operability of the vehicle is not good. Further, since the boom-type elevating device has a configuration having a plurality of control axes, there is a problem that the working range is wide, but the mechanism is complicated and expensive.

In the vertical post-type lifting device, a vertical post is provided immediately after the driving cabin so as to be able to expand and contract vertically, offset to the left or right of the vehicle body, and a workbench is stored on the vehicle body alongside the vertical post. It is configured so that: Since this lifting device is a vertical lifting type, the working range is narrower than the boom type lifting device, but the overall height of the vehicle can be kept low, and the work radius is small, so the overturning moment acting on the vertical post is also reduced. In addition, the lifting device can be reduced in size and simplified. However, the vertical post and the workbench occupy the cargo space and the cargo space becomes narrower, and the offset amount of the vertical post with respect to the center of the vehicle body becomes large, so the weight balance in the left and right direction of the vehicle body is lost and the traveling performance deteriorates. There was a problem that it was easy.

The scissor type elevating device is a type of elevating device in which the working table is vertically raised and lowered similarly to the above-mentioned vertical post type elevating device. However, since the elevating mechanism is located directly below the working table,
The work table area can be secured to the full width of the vehicle with a good balance of weight, and the mechanism can be simply configured.However, it requires a larger area than the boom-type lifting device, and it is difficult to secure a space for loading cargo. there were.

For this reason, work at high places is performed less frequently,
For a company that rarely moves to a certain height to perform maintenance and inspection work, the conventional multipurpose aerial work vehicle is still difficult to use. The present invention has been made in view of such a problem, and provides a versatile aerial work vehicle that can be normally used similarly to a general transport truck and can be moved to a predetermined height when necessary. The purpose is to do.

[0010]

SUMMARY OF THE INVENTION To achieve the above object, the present invention relates to a vehicle body having a driving cabin and capable of traveling, and a pair of bases attached to the left and right sides of the vehicle body in the width direction and extending vertically. A rail (for example, the rail member 11r of the first mast in the embodiment) and at least one stage of a lifting mast (for example, the second mast in the embodiment) which is nested between these left and right base rails and slidable up and down. Masts to fourth masts 12 to 14) and lifting / lowering operating means (for example, the lifting / lowering cylinder 31, the chains 32, 3 in the embodiment) for vertically moving the lifting / lowering masts.
3, sprockets 32s, 33s, etc.), and a workbench on which a worker can ride is mounted on a lifting / lowering mast to constitute an aerial work vehicle.

According to the aerial work vehicle having the above structure, the lifting mast that moves up and down with respect to the vehicle body is movably sandwiched between a pair of base rails attached to the left and right sides of the vehicle body. A workbench is attached to the lifted mast that is sandwiched. For this reason, the thickness of the base rail in the front-rear direction only needs to be about the width of a groove for slidably guiding the lifting mast so as not to tilt back and forth, and the lifting means is provided between the left and right base rails, outside the base rail, or front and rear. Can also be provided. In addition, since the work table is not cantilevered and the load is distributed and received on both the left and right base rails, individual rails, masts, supports, and the like can be reduced. Therefore, the lifting device can be configured to be thin, and a work table having the full width of the vehicle body can be provided. Can be provided. In addition, since the weight balance between the right and left sides of the vehicle body can be evenly configured, a high-altitude work vehicle with good traveling performance can be configured.

It is preferable that the vehicle body has a loading platform on which luggage can be loaded, and the work platform is stored on the loading platform in the storage position. According to such a configuration, the height of the vehicle can be kept low, and an aerial work vehicle that can be driven easily like a general transport truck can be provided. In addition, since the lifting device is thin and stored on the loading platform, the loading platform can be widely used to carry luggage like a general transport truck, providing a highly versatile work platform. can do. Further, it is possible to provide an aerial work vehicle that is easy to get on and off the worktable and has good workability.
In particular, if the work table is configured to be foldable toward the lifting mast and attached so that it can be stored freely, the work table can be folded and stored within a small dimension in the front-rear direction together with the thin lifting device configured between the left and right base rails Can be
This makes it possible to obtain an aerial work vehicle having high transportability that is almost the same as a general transport truck.

The lower end of at least one of the base rail and the lifting mast is disposed to extend below a carrier mounting surface of the vehicle body (a support surface for supporting the vehicle platform or the like in the vehicle, ie, an upper surface of the vehicle body chassis). It is desirable. According to such a configuration, it is possible to obtain an elevating device with a high head with a low total vehicle height and a small number of stages.
In other words, in the configuration in which the entire lifting device is installed above the chassis, in order to keep the overall height of the vehicle low, the number of stages of the lifting mast must be increased to secure the head, or the cost must be reduced by using a small number of lifting masts. Or it is necessary to select one of the means. However, the means has a problem that the structure is complicated and the cost increases, and the means has a problem that the head is reduced and the working range is narrowed. According to the elevating device of this configuration, at least one of the base rail and the mast is disposed so as to extend below the mounting surface of the carrier. , A high work vehicle equipped with an elevating device that secures a high head with a simple configuration with a small number of steps can be obtained.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of an aerial work vehicle according to the present invention. The aerial work vehicle 1 is constructed on the basis of a so-called flat body type transport truck, has a driving cabin 2 in front of the vehicle body, and has a front end of a carrier 4 of the transport truck which can travel on front and rear tire wheels 3a, 3b. At the position, an elevating device 10 capable of vertical ascending and descending is attached, and a work table 50 is attached to an elevating mast at the tip thereof.

Prior to the detailed description of the structure, the lifting device 10 will be briefly described. As shown in FIG. 2, a main cross-sectional view of the lifting device 10 when the left rail portion is stored from above is shown in FIG. The masts 11, 12, 13, and 14 having concave rails are sequentially inserted in a nested manner and assembled so as to be slidable in the direction in which the rails extend (up and down directions), and ascend and descend comprising a telescopic cylinder 31, chains 32, 33 and the like. The mast on the distal end side is moved up and down with respect to the mast on the proximal end side by operating means.

The mast is a first mast 1 fixed to the vehicle body.
1, a second mast 12, a third mast 13, and a fourth mast 14, which are sequentially nested into the first mast.
Each mast (for example, the second mast 12) has a pair of left and right rail members (12r, 12r) having a concave cross-section opened in the left and right sides and extending vertically, and a connecting member for horizontally connecting the left and right rail members vertically. (12u, 12l) and is formed in an outer rectangular frame shape by connection means such as welding. In addition, in each drawing, the subscript r is added to the rail member, the subscript u is added to the upper connecting member, and the subscript l is added to the lower connecting member with respect to the numbering of each mast.

As shown in FIGS. 4 and 5, the first mast 11 is located at the front end of the carrier 4 and has left and right rail members 11r.
The lower end extends downward through an opening provided in the carrier 4 and is fixed to a vehicle body frame (chassis frame) at a lower portion of the carrier 4. The left and right rail members extending upward are connected by a connecting member 11u protruding forward at an upper end thereof. Sliders 21a, 21b, and 21c made of a self-lubricating metal material such as an impregnated metal are attached to the inside of the concave rail portion of the first mast 11, and the second mast 12 is held between the sliders. Are slidably fitted up and down.

As described above, the lower end of the rail of the first mast, which is the base of all masts, is disposed so as to extend below the carrier 4, and the rail length is extended by the length L shown in the drawing. The second to second clamped inside the rail member 11r
The rail length of the fourth mast can likewise be increased by its extended length, so that the lift per mast stage can be increased by L and the overall mast by 4L. In addition, the opening provided in the loading platform 4 may have a size that allows the lower end of the second to fourth masts to be inserted while allowing the rail member 11r to communicate therewith. It may be a rectangular hole.

The second mast 12 and the third mast 13 are
As described above, the left and right rail members are connected by the upper and lower connecting members to form an outer rectangular frame, and the sliders 22a, 22b, and 22c mounted inside the concave rail portion of the second mast 12 are provided. The third mast 13 is fitted and slidably mounted vertically so as to be sandwiched. Bracket plates 12b and 13b for fixing a chain or a wire as an elevating means or pivotally supporting a sprocket or a sheave are fixed to lower end portions of the left and right rail members of the second mast 12 and the third mast 13.

A work table 50 is attached to the upper end of the fourth mast 14 so as to connect the left and right rail members, and a connecting member 141 and a bracket plate 14b are fixed to the lower end. The fourth mast 14 is sandwiched in the left-right direction by a slider 23b attached to the inner surface of the rail portion of the third mast, and is slidable up and down with respect to the third mast by a cam follower 23a attached to the fourth mast. It is inserted.

The mast, which is inserted in a nested manner and assembled so as to be relatively slidable up and down, is raised and lowered by lifting means built in the mast. The elevating means includes an elevating cylinder 31, chains 32 and 33, and a wire rope 4 as schematically shown in FIG.
2, 43, sprockets 32s and 33s, sheaves 42s and 43s, and the like. In FIG. 3, the chains 32, 33 of the mechanical system for extending and retracting the mast are indicated by dotted lines for the sake of simplicity, and the wire ropes 42, 42 of the mechanical system for preventing the mast from rapidly descending. 43 is indicated by a two-dot chain line for convenience. Also, in order to avoid complicating the drawing, the illustration of wire ropes, sheaves, sprockets, and the like is omitted in FIG.

The lifting cylinder 31 is provided between the base end of the first mast 11 and the upper connecting member 12u of the second mast 12. For example, when a single-acting hydraulic cylinder is used, By supplying hydraulic oil to the tube-side oil chamber, the piston rod is extended, and the second mast 12 is extended with respect to the first mast 11, that is, the second mast 12 is raised. In addition, the hydraulic oil held in the tube-side oil chamber is drained into the tank, whereby the piston rod is pressed by the weight of the second mast or more by its own weight to reduce the length, and the second mast 1
2 is lowered.

A chain 32 is stretched between the upper connecting member 11u of the first mast and the bracket plate 13b at the lower end of the third mast. The chain 32 has one end 3
2f is fixed to the upper connection member 11u of the first mast, is wound around a sprocket 32s rotatably attached to the upper connection member 12u of the second mast at an intermediate portion, and is folded back. It is fixed to the bracket plate 13b at the lower end of the three masts.

A chain 33 is stretched between the upper connecting member 12u of the second mast and the bracket plate 14b at the lower end of the fourth mast. One end 33f of the chain 33 is fixed to the upper connecting member 12u of the second mast, and the chain 33 is wound around a sprocket 33s rotatably attached to the upper connecting member 13u of the third mast at an intermediate portion, and is folded. The other end 33m is fixed to the bracket plate 14b at the lower end of the fourth mast. These chains and sprockets constitute a raising mechanism and a lowering mechanism.

A wire rope 42 is stretched between the upper connecting member 11u of the first mast and the bracket plate 13b at the lower end of the third mast separately from the chain 32. One end 42f of the wire rope 42 is fixed to the upper connecting member 11u of the first mast, and is wound around a sheave 42s rotatably attached to the bracket plate 12b at the lower end of the second mast at an intermediate portion and folded. , The other end 42m is the bracket plate 13b at the lower end of the third mast.
It is fixed to.

A wire rope 43 is stretched separately from the chain 33 between the upper connecting member 12u of the second mast and the bracket plate 14b at the lower end of the fourth mast. One end 43f of the wire rope 43 is fixed to the upper connecting member 12u of the second mast, and the wire rope 43 is wound around a sheave 43s rotatably attached to the bracket plate 13b at the lower end of the third mast at an intermediate portion and folded. The other end 43m is fixed to the bracket plate 14b at the lower end of the fourth mast. These wire ropes and sheaves constitute a descent stop mechanism.

In the lifting mechanism 10 thus formed,
When the mast is extended, hydraulic oil is supplied to the tube-side oil chamber of the elevating cylinder 31 through the solenoid proportional valve at a predetermined valve opening degree, and the piston rod is extended at an extension speed proportional to the valve opening degree. The second mast 12 is raised with respect to the first mast 11.

When the second mast 12 moves upward, the sprocket 32s attached to the upper connecting member of the mast rises accordingly, and the third mast 12 is lifted by pulling up the chain 32 wound around the sprocket 32s. 13 is moved up. Further, when the third mast is moved upward, the sprocket 33s is moved upward, and the fourth mast 14 is moved upward by the action of the chain 33 wound around the sprocket 33s. Therefore, the lifting cylinder 3
By extending the working table 1, the masts 12, 13, 14 can be extended uniformly with respect to the first mast 11, and the work table 50 can be raised.

On the other hand, when the mast extended as described above is contracted, the operating oil pressure held in the tube-side oil chamber of the elevating cylinder 31 is drained to the tank via the electromagnetic proportional valve at a predetermined valve opening. . Lifting cylinder 31
The mast above the second mast and the weight of the worktable are acting on the piston rod, and the piston rod is pressed with this weight, and the piston rod is contracted at a contraction speed proportional to the valve opening. The second mast 12 is moved down.

When the second mast 12 moves down, the sprocket 32s attached to the upper connecting member of the mast moves down accordingly, and the third mast 12 is lifted and supported by the chain 32 wound around the sprocket 32s. Mast 1
3 falls. Further, as the third mast descends, the sprocket 33s moves down, and this sprocket 33
The fourth mast 14 lifted and supported by the chain 33 wound around s descends. Therefore, the lifting cylinder 31
The hydraulic pressure acting on the tube side oil chamber is drained so that each mast 12, 1
The work table 50 can be lowered by uniformly reducing the lengths of the working units 3 and 14.

The lowering stop mechanism is used when the workbench 50 is lowered by using the weight of the mast as described above, and when one of the masts is caught due to tilting of the mast or the like, the state in which the mast cannot be lowered occurs. In addition, the safety mechanism is provided so as to stop the lowering of the entire mast and prevent the mast from being rapidly lowered when the catch is released.

For example, when the fourth mast 14 is caught during the lowering operation of the work table and the lowering stop mechanism is not provided, the second mast 12 and the third mast 13 are lowered, but the fourth mast 14 is lowered. Is not lowered, and as a result, the chain 33 becomes slack. Then, when the hook is released after a certain amount of slack is generated, the fourth mast 14 rapidly descends by the slack of the chain 33.

In the descent stop mechanism, when the fourth mast 14 is caught and stops descending, the third mast 13 is supported by the tension of the wire rope 43 wound around the sheave 43s. The lowering of the mast is restricted, and the second mast 12 is supported by the tension of the wire rope 42 wound around the sheave 42s, and the lowering of the mast is restricted. Therefore, even if any of the masts is caught, the descent of the entire mast can be stopped to prevent a rapid descent of the work table 50.

It should be noted that a double-acting hydraulic cylinder is used as the elevating cylinder 31, and the working oil is supplied to the rod-side oil chamber of the hydraulic cylinder so that the mast is reduced and the work table 50 is lowered. You may.

The lifting device 10 thus configured has a thin frame-shaped mast which is sequentially inserted into the rail-shaped members on the left and right sides of the vehicle body, and the lifting mechanism is configured in this frame. It is possible to provide a thin and light weight in the front-rear direction and a good weight balance in the vehicle left-right direction.

The first mast rail member extends below the mounting surface of the carrier 4 and is fixed to the body frame at the lower portion of the carrier 4, so that the height of the vehicle can be raised with a simple configuration with a small number of steps while keeping the overall height of the vehicle low. It is possible to obtain an elevating device that secures the distance.

The lifting device 1 constructed as described above
The work table 50 is attached to the fourth mast 14 of the “0”. FIG. 4 shows an unfolded state of the work table 50 in a storage position in which the work table 50 is lowered onto the loading platform 4 (preparation state for work at height), and a storage state in which the work table is folded in this storage position. As shown in FIG. 5, it is configured so as to be freely folded and stored.

The work table 50 includes a work table frame 52 attached to the fourth mast 14 and a work table frame 52.
A work floor 53 pivotally connected to the worktable 53 so as to be vertically swingable and freely deployable and stowable, and a handrail 54 pivotally connected to the worktable frame 52 so as to be swingable in the horizontal direction and unfoldable and stowable.
a, 54b, one end of which is pivotally connected to an upright support portion of the handrail 54a so as to be capable of horizontal rotation and vertical swing, and the other end is a handrail 54b.
Handrails 54a, 54
It comprises a lock bar 55 for locking b in an expanded state.

As shown in FIG. 4, the work table 50 is
0 is stored on the loading platform 4 in a storage position in which the vehicle is stored in the vehicle body, and the operator can easily open and close the lock bar 55 to get on and off the platform. Then, by operating a lifting / lowering operation device (not shown) provided on the worktable 50, the worktable 50 can be moved to a high place of a desired height as shown in FIG.

When the work at a high place is not performed, the work table can be folded and stored on the mast as shown in FIG. At this time, in the storage posture shown in FIG.
The engagement between the lock bar 55 and the handrail 54b is released to release the locked state of the workbench by the lock bar 55, and the lock bar 55 falls down along the handrail 54a. Next, the left and right handrails 54a and 54b are horizontally swung about the left and right pivot axes of the worktable frame 52 as a center of rotation, and the upright support portion is folded to the center of the worktable frame 52. Then, the end of the work floor 53 is lifted and swung upward, and the work floor 53 is stored in the work table frame 52 with the door closed (FIG. 5).

A hydraulic unit 40 for generating hydraulic pressure, which is an operation source of the elevating device 10 and supplying hydraulic oil to the elevating cylinder 31 and the like, is disposed below the work table 50. An operation control device 45 for controlling the operation of the device 10 is provided. The front-rear dimensions of these devices are substantially the same as those of the work table 50 folded.

As described above, since the work table 50 is stored on the loading platform 4, the work table 50 is superior to a conventional high work vehicle which is stored immediately above the driving cabin 2, and is excellent in vehicle operability. It can be a working vehicle. The work table 50 stored on the loading platform is folded and stored as shown in FIG. 5, and the hydraulic unit 40 and the operation control device 45 of the elevating device 10 are stored under the work table 50. In combination with the thin lifting device 10, the loading platform 4 can be widely used in the same manner as a normal transport truck.

Next, a second embodiment of the workbench in the aerial work vehicle according to the present invention is shown in FIGS. 6 (a) and 6 (b). The figure shows a stored state in which the workbench is folded, and shows a side sectional view (a) and a front view (b) in the stored state, respectively.
The work table 60 is provided with the fourth mast 14 of the lifting device 10 described above.
A work table frame 62 attached to the upper end of the work table, a work floor 63 pivotally connected to the lower part of the work table frame 62 so as to be vertically swingable, and a work table frame 62 attached to the upper part of the work table frame 62 so as to be able to swing vertically. It is composed of a handrail 64 and the like. The workbench 60 is provided with an elevating operation device (not shown) for operating the elevating device 10.

The work floor 63 is swung and deployed downward as shown by a two-dot chain line in FIG. 6A to form a horizontal floor surface, and the handrail 64 is swung and deployed upward. This forms a handrail that projects horizontally above the floor. The work floor 63 and the handrail 64 are held at a horizontal position by lock means (not shown). Therefore, the worker who works at a high place can stand on the upper part of the floor surface 63 and perform the work by appropriately using the handrail 64 formed around the upper part.

When the work table 60 is retracted, the lock is released, and then the handrail 64 is folded in the reverse order to the above.
The work floor 63 is folded toward the mast so as to cover the handrail 64 and stored. At this time, the work table 60 is stored between the left and right rail members as shown in FIG. 6B, and is stored between the left and right rails as shown in FIG. The workbench can be stored within the directional thickness dimension. Therefore, according to such a configuration, it is possible to provide an aerial work vehicle that can utilize the carrier 4 more widely.

Next, a third embodiment of the workbench in the aerial work vehicle of the present invention is shown in FIGS. 7 and 8 (a) to 8 (e). The work table 70 includes a work table frame 72 attached to the upper end of the fourth mast 14 of the lifting device 10 described above, and a work floor 73 pivotally connected to the lower end of the work table frame 72 so as to swing up and down. A pair of left and right side handrails 74, 74 having a long hole portion 74b engaged with a pivot pin 72b provided at an upper end portion of the worktable frame 72 and slidably and relatively movable in a predetermined direction; One end is pivotally connected to the tip of the side railing 74 and the slot 7 provided on the other end is provided.
5b, a pivot pin 73b provided at the tip of the work floor 73
And a pair of left and right arms 75, 75 and left and right arms, which are attached so as to be swingable with the side handrail 74 and swingable and relatively movable in a predetermined direction with the work floor 73. It is composed of a front handrail 76 to be connected.

A guide plate 72a is fixed to the upper end of the worktable frame 72 adjacent to a pivot pin 72b for pivoting the side railing 74. Guide plate 72a
Acts to restrict the side railing 74 pivoted by the long hole 74b from moving in the front-rear direction, and to allow swinging and movement only in the vertical direction along the guide plate. Similar guide plates 73a are also provided on the left and right sides of the work floor 73 to restrict the arm 75 connected by the long hole portion 75b from moving up and down in FIG. It acts so as to allow movement only in the front-back direction parallel to the floor surface along 73a.
The front ends (left ends in FIG. 7) of the left and right guide plates 73a are engaged with the lower end surface of the worktable frame 72 in a state where the workfloor 73 is swung and deployed, so that the front end of the workfloor 73 is horizontal. Are supported so as not to swing downward (see FIGS. 8A and 8B described later). The work floor 73 is provided with a lock means (not shown) for locking the work floor 73 so as not to be lifted and swung. Also, the work table 70
Is provided with a lifting operation device (not shown) that operates the lifting device 10.

The working table 70 is shown in the unfolded state in which the work floor and the side handrail 74 are pivotally connected to the work table frame 72 and the arm 75 is connected to the side handrail 74 and the work floor 73 in an unfolded state. As shown in (a), the work floor 73 is unfolded horizontally, and a handrail portion including side handrails 74, 74 and a front handrail 76 is formed above the work floor 73.

The work table 70 thus configured is shown in FIG.
It can be folded and expanded as shown in (a)-(e). Each figure shows a side view of the work table 70 as viewed from the left side, and shows the work table 70 in a stepwise manner from the unfolded state in FIG. 8A to the stored state in FIG. 8E.

When storing the workbench 70, first, in the unfolded state shown in FIG. 8A, the rocking lock of the work floor is released, and the front handrail 76 or the work floor 73 is lifted upward (FIG. a) to (c)). At this time, the guide plate 7
Since the movement of the side railing 74 and the handrail portion 75 is restricted by the action of 2a and 73a and swings, the workbench 70 acts as a parallel link with the workbench frame 72 as a fixed portion and is deformed as shown.

When the work floor 73 and the side handrail 74 are swung until they become parallel to the work table frame 72, the guide plate 72a and the long hole of the side handrail 74, and the guide plate 73a of the work floor and the arm 75 The long holes are parallel to each other (FIG. 8D), and the side railing 74 and the arm 7
Reference numeral 5 denotes an engagement portion between the pivot pin and the long hole, and a guide plate 7
It becomes possible to move downward along 2a and 73a. 8 by moving the front handrail 76 downward.
The worktable 70 can be folded and stored as shown in FIG.

Therefore, according to the above-described configuration, a thin work table can be constructed, which is a simple mechanism using a link mechanism, and can be expanded and stored by a simple operation of moving the front handrail 76 up and down. Can be. Further, since the working table 70 stored on the loading platform is folded and stored in a thin shape, the loading platform 4 can be widely used similarly to the ordinary transport truck in combination with the above-described lifting device 10.

Next, a fourth embodiment of the workbench in the aerial work vehicle according to the present invention will be described with reference to FIGS. The work table 80 is provided with the fourth mast 1 of the lifting device 10.
4, a worktable frame 82 attached to the upper end of the worktable 4, a floor panel 83 pivotally connected to the lower end of the worktable frame 82 in a vertically swingable manner, and two panel members 84a and 84.
b and a pair of left and right side panels 84, 84, which are configured to be able to bend and stretch horizontally inward, and which are attached to the distal ends of the left and right distal side panels 84b, 84b so as to be swingable in a horizontal plane. It is composed of a front member 85 connecting the panels 84, 84 and the like.

The work table 80 is, as shown in FIG.
0 is stored on the loading platform 4 in a state of being stored in the vehicle body, and the operator can easily get on and off the loading platform from the loading platform 4 through the entrance provided on the front panel 85. The work table 80
In an unfolded state as shown in FIG. 9, the outer peripheral edge of the floor panel 83 is engaged with supporting portions provided inside the left and right side panels 84 and the front panel 85 to be horizontally held, and a lock (not shown) The mechanism locks the worktable 80 in a deployed state. The workbench 80 is provided with an elevating operation device (not shown). By operating the elevating operation device with a button, the workbench 80 can be moved to a high place of a desired height to perform high-place work. It has become.

FIG. 11 and FIG.
The work table 80 can be folded and stored on the mast when the work at high places is not performed, as shown in the storage process and the folded storage state in FIG. When stored,
First, the floor panel 83 is unlocked and rocked so that the front end of the floor panel is flipped up.
Erect along. Next, the front panel 85 is pressed in the mast direction, and the left and right side panels 84, 84 are folded and stored. The side panel 84 composed of the two panel members 84a and 84b is hinged so as to be bent only toward the inside of the work table, and is bent at the hinge by pressing the front panel 85 in the mast direction. As shown in FIG. 10, it is folded and stored in the workbench frame 82. At the time of storage, it is held in the stored state by a lock means (not shown).

At the left and right ends of the floor panel 83, rotatable guide rollers 86 are mounted so that the roller surfaces protrude left and right from the floor panel 83. Therefore, when the floor panel 83 is unfolded or stored, the front end of the floor panel is caught on the inner surface of the side panel,
The inner surface of the side panel 84 is not damaged, for example, when the floor panel is deployed, the side panels 84a,
84b is in a state of being bent in the shape of "ku",
The guide roller 86 guides the left and right side panels 84, 84 from inside even when the left and right side panels 84, 84 are both biased in any direction, etc., so that the workbench 80 can be smoothly deployed. Is available.

In place of the guide roller 86, a slider (sliding member) formed by processing using a resin material having a low friction coefficient such as nylon or high-molecular polyethylene is attached to the front end of the floor panel 83 on the left and right sides. Provided so as to protrude toward
The slider may slide relative to the inner surfaces of the left and right side panels 84 to guide the side panels 84.

As described above, the work table 80 is provided on the floor panel 83.
The working table can be deployed and stored by a simple operation of swinging up and down and pushing and pulling the front panel 85. Further, since the work table 80 stored on the loading platform is folded and stored in a thin shape, the loading platform 4 can be widely used in the same manner as a normal transport truck in combination with the above-described lifting device 10.

Although the preferred embodiment in which the lifting device 10 is provided on a so-called flat body type transport truck has been described above, the lifting device of the present invention is not limited to such a truck, but also includes a loading platform. The present invention is also applicable to a van body type transport truck having a room, and can provide an aerial work vehicle having a large luggage compartment. FIG. 13 shows an aerial work vehicle of such an embodiment.

This aerial work vehicle has a driving cabin 2 and a luggage compartment 5 formed of aluminum panels or the like on a luggage platform 4 of a vehicle body that can run on tire wheels 3a and 3b. 5 is provided with a thin lifting device 10 similar to that described above. On the other hand, in the aerial work vehicle of the present embodiment, the work table 90 is configured to be stored directly above the driving cabin 2, and a ladder for getting on and off the work table 90 is provided on the side surface of the rail member 11 r of the first mast. 91 are provided. When the workbench 90 is stored in the vehicle body, the height of the elevating device 10 is suppressed to the same level as the overall height of the vehicle including the luggage compartment 5.

Therefore, according to the aerial work vehicle of the above embodiment, the lifting device 10 can be used without deteriorating the operability of the vehicle.
Thus, it is possible to provide an aerial work vehicle capable of securing a large luggage space by minimizing the area occupied by the luggage carrier 4. It is to be noted that a folding handrail which can be extended and contracted up and down, or can be swung forward and backward and left and right can be provided at the upper portion of the work table 90, and the work table 50, 60, 70, 80 may be provided.

[0062]

As described above, according to the present invention, a vehicle body having a driving cabin and capable of traveling and moving, a pair of base rails attached to the left and right in the width direction of the vehicle body and extending vertically, and It is provided with at least one stage of a lifting mast which is nested between left and right base rails and can move up and down, and lifting and lowering operation means for vertically moving the lifting and lowering mast. A work platform is attached to form an aerial work vehicle. For this reason, the lifting device can be configured to be thin and lightweight, and a wide work table can be provided with the entire width of the vehicle body, thereby providing an aerial work vehicle with reduced space occupied by the lifting device and improved space efficiency. it can. Further, since the weight balance between the right and left sides of the vehicle body can be equalized, it is possible to configure a high-altitude work vehicle having good traveling performance.

The vehicle body has a loading platform on which luggage can be loaded. By configuring the working platform to be stored on the loading platform in the storage position, the overall height of the vehicle can be reduced, and general transportation can be performed. An aerial work vehicle that is easy to drive like a truck can be provided. In addition, since the lifting device is thin and stored on the loading platform, the loading platform can be widely used to carry luggage like a general transport truck, providing a highly versatile work platform. Together with
It is possible to provide an aerial work vehicle that is easy to get on and off the worktable and has good workability. In particular, if the work table is configured to be folded and mounted so as to be able to be stored toward the lifting mast, it is possible to obtain an aerial work vehicle having a high transportability that is almost the same as a general transport truck.

In addition, since at least one of the lower ends of the base rail and the lifting mast is arranged so as to extend below the mounting surface of the body in the vehicle body, the amount of vertical movement per step of the lifting mast can be increased. This makes it possible to provide a high-altitude working vehicle that secures a high lift with a simple configuration with a small number of stages while keeping the overall height of the vehicle low.

[Brief description of the drawings]

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

FIG. 2 is a main cross-sectional view of the lifting device of the aerial work vehicle as viewed from above.

FIG. 3 is an explanatory diagram illustrating a mechanism configuration of the elevating device.

FIG. 4 shows a first example of a workbench in the aerial work vehicle according to the present invention.
It is a perspective view showing an example, and is an explanatory view showing a deployment state of a work table.

FIG. 5 is a diagram illustrating a first example of a workbench in the aerial work vehicle according to the present invention.
It is a perspective view showing an example, and is an explanatory view showing a storage state of a work table.

FIG. 6 shows a second example of the workbench in the aerial work vehicle according to the present invention.
It is a drawing showing an example, and is a sectional view (a) and a front view (b) showing a stored state of a work table.

FIG. 7 shows a third example of the workbench in the aerial work vehicle according to the present invention.
It is a perspective view showing an example, and is a development view explaining composition of this work table.

FIG. 8 is an explanatory diagram showing a process of storing and expanding the work table.

FIG. 9 shows a fourth example of the workbench in the aerial work vehicle according to the present invention.
It is a perspective view showing an example, and is an explanatory view showing a deployment state of a work table.

FIG. 10 is a perspective view showing a fourth embodiment of the workbench in the aerial work vehicle according to the present invention, and is an explanatory diagram showing a stored state of the workbench.

FIG. 11 is a perspective view showing a fourth embodiment of the workbench in the aerial work vehicle according to the present invention, and is an explanatory diagram showing a process of unfolding and storing the workbench.

FIG. 12 is an explanatory diagram showing a process of unfolding and storing floor panels in the workbench of the fourth embodiment.

FIG. 13 is a perspective view showing another preferred embodiment of the aerial work vehicle according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 aerial work vehicle 2 operating cabin 4 carrier 5 luggage room 10 elevating device 11 first mast 11r first mast rail member (base rail) 12 second mast (elevation mast) 13 third mast (elevation mast) 14 fourth Mast (elevation mast) 31 Elevation cylinder (elevation means) 32, 33 Chain (elevation means) 32s, 33s Sprocket (elevation means) 42, 43 Wire rope (elevation means) 42s, 43s Sheave (elevation means) 50, 60, 70 , 80,90 workbench

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenji Ochiai 1152 Yamashita, Ryoke, Ryoke, Ageo-shi, Saitama F-term (reference) 3F333 AA08 AB05 BA04 BD02 CA02 CA30 DA05 DB10

Claims (3)

[Claims] 1. A vehicle body having a driving cabin and capable of traveling and moving, a pair of base rails attached to left and right in the width direction of the vehicle body and extending vertically, and nested between the left and right base rails. At least one stage of lifting and lowering mast that can be moved up and down, lifting and lowering operation means for vertically raising and lowering the lifting and lowering mast, and a worktable attached to the lifting and lowering mast, on which an operator can board. Aerial work vehicle. 2. The aerial work vehicle according to claim 1, wherein the vehicle body has a loading platform on which luggage can be loaded, and the working platform is stored on the loading platform in a storage posture. 3. The vehicle according to claim 1, wherein a lower end of at least one of the base rail and the lifting / lowering mast extends below a carrier mounting surface of the vehicle body. Aerial work vehicles.