JPH1111888A - High lift working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high lift working vehicle of such a structure that a supporting arm is movable to the outside and the inside of the range of the turning locus of a cabin, a bucket is accommodated and supported certainly, and the cabin can be turned upward at the time of engine maintenance. SOLUTION: At the front of the body of a high lift working vehicle 1, a cabin 3 is installed so as to be capable of being turned upward, and a boom 13 is installed in the rear of the vehicle body in a manner capable of revolving, rising and falling, and a bucket 15 is installed at the tip of the boom. On the back of the cabin, a post is installed upright to accommodate the bucket upon supporting over the cabin. The post is equipped protrusively with a supporting arm 32 for mounting of bucket approx. in the horizontal direction in such a way as capable of turning round the vertical shaft (m) of the post. The supporting arm is moved between the accommodating position situated ahead to protrude into the range of the turning locus of cabin when the bucket is accommodated and the retreat position situated in the back retreating to the outside of the range of the turning locus of cabin.

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 in which a workbench provided at the end of a boom is placed on a support frame to be stored and supported, and more particularly, to a rotating cabin rotating upward. The present invention relates to a countermeasure for avoiding the case where the support frame is located within the range of the motion trajectory.

[0002]

2. Description of the Related Art Generally, a cab-over vehicle in which a cabin is provided above an engine at a front portion of a vehicle body is applied to an aerial work vehicle, and the cabin rotates upward when engine maintenance is performed. It is supposed to. A swivel is mounted at the rear of the vehicle body so as to be swivelable, and a boom is provided on the swivel so as to be extendable and retractable. Further, at the tip of the boom, there is provided a work table on which a worker gets in and works, and in a state where the worker gets on the work table, the turn table is turned with the boom, and the boom is extended and retracted. The work table is moved between a high place and a low place by raising and lowering operation.

[0003] Further, two pillars are erected at the rear part of the vehicle body, and one of the two pillars is configured to support the boom when the boom is retracted, while the other pillar is used for the work. There is also an aerial work vehicle configured to support the work table when the table is stored (see Japanese Utility Model Laid-Open No. 6-6397). In this case, the workbench is positioned above the other support by being rotated about 180 ° from the axis of the boom with respect to the tip of the boom during storage, and is smoothly supported by the support. .

[0004]

By the way, in such an aerial work vehicle, when the work table is stored in the cabin due to the length of the boom and the connection structure with the work table at the tip of the boom, Some are located above.

[0005] In this case, even when the work table is stored above the cabin, it is desired that the work table be stored and supported by a support column. However, since there is a gap between the work table and the support column, the work column is located forward of the support column. It is necessary to store and support the worktable in this support arm, for example, by fixing a support arm projecting from the work arm.

However, in such a configuration, it is inevitable that the support arm is located within the rotation locus range of the cabin, and the support arm interferes with the support arm when the cabin rotates upward.
The engine cannot be maintained.

In view of this, it is conceivable to attach an adjuster mechanism to the cabin itself and directly store and support the worktable with respect to the cabin via the adjuster mechanism. However,
Since the cabin is supported in a floating state with respect to the front of the vehicle body, if the worktable swings up and down significantly due to running vibration, etc., the worktable can not be reliably supported, and the worktable and adjuster mechanism etc. Cause a failure.

The present invention has been made in view of the above point, and an object of the present invention is to construct a support arm protruding forward from a support column so as to be movable in and out of a rotation locus range of a cabin. The storage support of the table is ensured, and the cabin can be turned upward during engine maintenance.

[0009]

Means for Solving the Problems In order to achieve the above object, a solution taken by the invention according to claim 1 is a cabin provided rotatably upward at a front portion of a vehicle body, and a turning cabin provided at a rear portion of the vehicle body. An altitude provided with a boom that can be raised and lowered and has a working table at the tip, and a column that stands upright behind the cabin and that supports and stores at least the working table of the boom and the working table above the cabin. Assume a working vehicle. Then, a support arm on which the work table is mounted at the distal end is protruded from the support in a substantially horizontal direction so as to be pivotable about a vertical axis of the support. A front storage position in which the support arm projects into the rotation locus range of the cabin when the workbench is stored,
It is configured to be moved between a cabin and a rear evacuation position where the cabin retreats out of the rotation locus range.

According to the first aspect of the present invention, when the workbench is stored, the support arm is located at the front storage position protruding into the rotation locus range of the cabin. Even if it is located above, it is securely stored and supported by the support via the support arm. In addition, there is no need to directly store and support the workbench via the adjuster mechanism with respect to the cabin, thereby avoiding the occurrence of failures in the workbench and the adjuster mechanism due to large swinging of the worktable in the vertical direction due to running vibration etc. Is done.

On the other hand, when performing maintenance on the engine, the support arm is located at the rear evacuation position where the support arm retreats out of the rotation locus range of the cabin. Avoided, engine maintenance can be performed smoothly.

[0012] The solution taken by the invention of claim 2 is as follows.
In addition to the constituent features of the first aspect of the present invention, a boom support portion for mounting and supporting the boom when the boom is stored is provided on the column so as to be pivotable about a vertical axis of the column.

According to the second aspect of the present invention, only one support is required at the rear portion of the vehicle body, and the boom and the worktable are efficiently stored and supported by using the support.

[0014] The solution means taken by the invention according to claim 3 is:
In addition to the constituent features of the first or second aspect of the present invention, a position regulating means for positioning the support arm at the workbench storage position is provided between the support arm and the column.

According to the third aspect of the invention, when the support arm is moved to the workbench storage position, the support arm may be turned until the forward movement is restricted by the position restricting means. The positioning of the support arm to the worktable storage position is easily performed.

The solution taken by the invention according to claim 4 is as follows:
In addition to the constituent features of the invention according to any one of claims 1 to 3, a securing means for securing the support arm immovably at the workbench storage position is provided between the support arm and the column. It is configured to be provided.

According to the fourth aspect of the present invention, since the support arm is immovably secured at the worktable storage position by the securing means, the position of the support arm from the worktable storage position due to traveling vibration or the like. Displacement and the like are reliably prevented. In particular, when the movement of the support arm forward from the storage position of the worktable is restricted by the position restriction means, the securing of the support arm by the securing means can be easily performed with the support arm positioned at the storage position of the worktable. Is made.

The solution taken by the invention described in claim 5 is as follows.
In addition to the constituent features of the invention according to any one of claims 1 to 4, detection means for detecting that the support arm is located at the workbench storage position between the support arm and the column. Is provided.

According to the fifth aspect of the present invention, the state in which the support arm is not positioned at the workbench storage position is detected by the detection means, and the worker is notified of the prohibition of the boom and the workbench storage operation. , The safety at the time of storing operation of the boom and the work table is improved.

Further, a solution taken by the invention of claim 6 is characterized in that the boom support of the invention of claim 2 is specified. Specifically, the boom support is fixed to the base end of the support arm outside the rotation locus of the cabin, and the boom support is moved in conjunction with the support arm when the support arm is moved to the workbench storage position. Is moved to the storage position.

According to the sixth aspect of the present invention, by moving the support arm to the workbench storage position, the boom support portions are also positioned at the storage position, and it is not necessary to individually position the boom support portions at the storage position. It is free from troublesome individual operations. In addition, it is not necessary to provide the boom support with the function of turning with respect to the column, and parts necessary for the function of turning are also used.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show an aerial work vehicle according to an embodiment of the present invention. The aerial work vehicle 1 includes a pair of left and right body frames 2 (vehicle body), and a front part of the body frame 2. The cabin 3 is supported by a floating mechanism (not shown) so that running vibrations and the like are buffered.
It is transmitted to. The front end of the cabin 3 is supported by a hinge (not shown) at the front end of the vehicle body frame 2 so as to rotate upward. An engine (not shown) is mounted below the cabin 3, and maintenance of the engine and the like are performed while the cabin 3 is rotated upward.

The vehicle body frame 2 is provided with a projecting piece 4 projecting obliquely forward toward the lower rear end of the cabin 3. At the tip (upper end) of the protruding piece 4, a protruding portion 4a protruding outward in the vehicle width direction is provided. A frame-shaped engaging portion 5 is provided at the lower rear end of the cabin 3 so as to be detachably engaged with the convex portion 4a from outside in the vehicle width direction. The engaging portion 5 is urged by an urging spring 6 in a direction in which the engaging portion 5 is engaged with the convex portion 4a. further,
The engaging portion 5 is provided with an operation lever 7 that can be operated from outside the vehicle body. The operating lever 7 allows the engaging portion 5 to be operated in the disengagement direction against the biasing spring 6. ing.

As shown in FIG. 4, a sub-frame 11 is provided on a rear portion of the vehicle body frame 2. A swivel 12 is rotatably supported at the rear end of the sub-frame 11. A pair of left and right turning columns 12a (only one is shown in the figure) are erected on the turning table 12,
A boom 13 (a first arm 13a, which will be described later) having a substantially rectangular cross section is supported between the upper ends of the turning columns 12a via a shaft 14 so as to be vertically rotatable. The boom 1
3 is a base end boom 13a pivotally supported by the turning column 12a.
A middle boom 13b slidably fitted and supported on the inner peripheral surface of the base end boom 13a, and a distal boom 13c slidably fitted on the inner peripheral surface of the intermediate boom 13b. Is configured. A bucket 15 as a working table on which the worker gets in and works is held at a tip end of the tip boom 13c while maintaining a predetermined posture regardless of the ups and downs of the boom 13. It is supported to swing right and left. A telescopic cylinder (not shown) is provided between the base boom 13a and the distal boom 13c, and the telescopic cylinder expands and contracts the boom 13.

An up-and-down cylinder 17 is provided between the base end boom 13a of the boom 13 and the turning column 12a, and the boom 13 is moved up and down as the up-and-down cylinder 17 expands and contracts. Horizontal cylinders (not shown) are provided between the turning column 12a and the base end boom 13a and between the distal end boom 13c and the connecting member 16, respectively.
The bucket 15 is held in a horizontal position regardless of the up-and-down state.

The swivel table 12 (swing column 12a) and the boom 13 are swiveled by a swivel motor (not shown). The turning column 12a and the boom 13 are capable of turning approximately 180 ° around both the left and right sides with respect to the storage position where the bucket 15 is stored immediately above the cabin 3.

At the front and rear ends of the sub-frame 11, members 21 (only the front one is shown in the figure) extending in the vehicle width direction are provided, and jacks 22 are provided at the left and right ends of each member 21. ing. A telescopic hydraulic cylinder (not shown) is provided inside each of the jacks 22. When the aerial work vehicle 1 works, each of the jacks 2
By extending the hydraulic cylinder 2 with the extension of the hydraulic cylinder, the aerial work vehicle 1 is supported.

As shown in FIG. 7, a column 31 having a substantially square cross section is provided upright at a substantially middle position of the front member 21. As shown in FIG. 3, the support column 31 is provided with a support arm 32 projecting substantially horizontally upward from the cabin 3. The tip (projecting end) of the support arm 32 has the bucket 15
Is provided with a bucket supporting portion 33 for mounting the bucket 15 directly above the cabin 3 and supporting the bucket 15 in the front-rear direction when the vehicle is stored. As shown in FIG. 5, a disk 34 is fixed to the base end of the support arm 32, and the diameter of the disk 34 is set to a length substantially matching the diagonal line on the cross section of the column 31. Is formed. A cylindrical portion 35 is protruded from the lower surface of the circular plate 34, and the cylindrical portion 35 is rotatably fitted into the support column 31 from an upper end opening thereof. Further, FIG.
As shown in FIG.
It is formed to have a length that stops at the upper part of 1. At positions corresponding to the outer peripheral portion of the column 31 corresponding to the vicinity of the upper and lower ends of the cylindrical portion 35, flange-shaped reinforcing plates 36 bulging substantially uniformly outward from the column 31 are integrally provided, respectively. The deflection load in the radial direction orthogonal to the vertical axis m of the cylindrical portion 35 in the inside is effectively suppressed by the upper and lower reinforcing plates 36. The upper end opening of the support 31 is closed by the disk 34, and the base end of the support arm 32 is supported rotatably around the vertical axis m of the support 31. As shown in FIGS. 3 and 4, when the bucket 15 is stored, the support arm 32 is located immediately above the cabin 3 and protrudes within the range of the rotation locus X of the cabin 3; As shown in FIG. 2, from the storage position (the position immediately above the cabin 3), it is rotated counterclockwise to move between the retracted position at the rear and the retracted position outside the range of the rotation locus X of the cabin 3. Has become.

When the boom 13 is retracted, the boom 13 (proximal boom 13a) is placed at the base end of the support arm 32 (directly above the column 31) outside the range of the rotation locus X of the cabin 3. A boom support portion 41 that is mounted and supported from both sides is fixedly provided. The boom support 41
Is moved in conjunction with the support arm 32, and moves to the storage position facing the both sides of the boom 13 when the support arm 32 moves to the storage position.

Further, as shown in FIG.
A position restricting means 42 is provided between the arm and the support arm 32. The position restricting means 42 includes a dog 43 projecting radially outward from one circumferential side of the upper surface of the disk 34. A stopper 44 is provided on the upper surface of the upper reinforcing plate 36 to contact the dog 43. When the support arm 32 moves to the storage position, the dog 43 contacts the stopper 44 to store the support arm 32. Position, so that the movement of the support arm 32 forward thereof is restricted. The dog 43 and the stopper 44 constitute a position regulating means 42.

As shown in FIG. 7, a securing means 45 is provided between the support 31 and the support arm 32. The securing means 45 is composed of a long bolt 46 and a nut 47 which penetrate the support 31 and the cylindrical portion 35 located between the upper and lower reinforcing plates 36 in the horizontal direction. When the support arm 32 is located at the retracted position, the long bolt 46 has a true circular first bolt hole 48 facing each other at an angle of 180 ° in the circumferential direction of the support column 31, and 180 ° in the circumferential direction of the cylindrical portion 35. The support arm 32 is inserted into the perfect circular second bolt hole 49 facing each other at an angle of ° so as to be immovably fixed at the storage position.

A detection switch 51 is provided between the column 31 and the support arm 32 as detection means for detecting that the support arm 32 is located at the storage position. The detection switch 51 is an ON / OFF switch. A protruding piece 52 is provided on the other side in the circumferential direction of the upper surface of the disc 34 (position approximately 180 ° out of phase with the dog 43) so as to project radially outward from the other side in the circumferential direction. When the support arm 32 is moved to the storage position, the protruding piece 52 comes into contact with the contact point 51a of the detection switch 51 so that the detection switch 51 can be switched to the ON position. When the ON signal is output from the detection switch 51, the boom 13 and the bucket 15 close the circuit (not shown) of the boom 13 to enable the storage operation, while the detection switch 51 When the ON signal is not output from (when it is in the OFF state)
, The circuit of the boom 13 is opened to disable the storing operation.

Therefore, in the above embodiment, when the bucket 15 is stored, the support arm 32 is positioned at the front storage position (the position shown in FIG. 3) which protrudes into the rotation locus X of the cabin 3. Even when the bucket 15 is located above the cabin 3, the bucket 15 can be reliably stored and supported by the support 31 via the support arm 32. Moreover, there is no need to directly store and support the bucket via the adjuster mechanism with respect to the cabin, and it is possible to avoid occurrence of failure of the bucket or the adjuster mechanism due to large swinging of the bucket in the vertical direction due to running vibration or the like. it can.

On the other hand, when the maintenance of the engine is performed, the support arm 32 is located at the rear evacuation position (the position indicated by the solid line in FIG. 1) which evacs outside the rotation locus X of the cabin 3. Interference with the support arm 32 at the time of rotation of the engine upward can be avoided, and engine maintenance can be performed smoothly.

Further, since the boom support portion 41 is fixedly provided at the base end of the support arm 32, there is no need to separately stand uprights for storing and supporting the boom 13 and the bucket 15, and the support 31 is not required. Only one rod is required, and the boom 13 and the bucket 15 can be efficiently stored and supported using the support 31 as well. In addition, by moving the support arm 31 to the storage position, the boom support portions 41 are also positioned at the storage position, so that it is not necessary to individually position the boom support portions at the storage position. And the boom support 4
It is not necessary to provide the turning function of the support 31 to the support 31, and the parts necessary for the turning function can be shared.

Further, since the movement of the support arm 32 forward from the storage position is restricted by the position restricting means 42, when the support arm 32 is moved to the storage position, the forward movement is restricted. The support arm 32 only needs to be pivoted up to this position, and the support arm 32 can be easily positioned at the storage position. Further, since the support arm 32 is immovably fixed at the storage position by the fixing means 45, it is possible to reliably prevent the support arm 32 from being displaced from the storage position due to running vibration or the like. The securing of the support arm 32 by the securing means 45 can be easily performed in a state where the movement of the support arm 32 forward from the storage position is regulated by the regulating means 42.

Further, since the ON signal from the detection switch 51 detects that the support arm 32 is located at the storage position, the hydraulic circuit of the boom 13 is opened when the support arm 32 is not located at the storage position. As a result, the storage operation of the boom 13 and the bucket 15 is prohibited, and the storage operation of the boom 13 and the bucket 15 can be reliably performed.

It should be noted that the present invention is not limited to the above embodiment, but includes various other modifications. For example, in the above-described embodiment, the boom support portion 41 is fixed to the base end of the support arm 32. However, the boom and the support for the bucket are erected, and the boom support is perpendicular to one of the supports. You may make it support so that it can turn around an axis.

In the above embodiment, the detection switch 5
The circuit of the boom 13 is opened when the ON signal is not output from 1 and the storing operation of the boom 13 and the bucket 15 is disabled. However, when the ON signal is not output from the detection switch, an indicator lamp, an alarm, or the like is output. Thus, the worker may be urged to prohibit the operation of storing the boom. In short, any means may be used as long as the worker is notified that the boom storing operation is prohibited when the ON signal is not output from the detection switch.

Further, in the above embodiment, the second bolt holes 49 having a perfect circular shape are provided in the circumferential direction of the cylindrical portion 35.
The bolt hole may be formed in a vertically long elliptical shape that is long in the vertical axis direction of the column. In this case, alignment with the first bolt hole on the column side is facilitated, and the long bolt is easily inserted. be able to.

In addition, in the above embodiment, the bucket 15 is provided at the tip of the boom 13 so that the worker can get on and work. However, a cleaning tool for cleaning the streetlight may be provided at the tip of the boom. It is.

[0043]

As described above, according to the aerial work vehicle according to the first aspect of the present invention, at least the support arm for supporting the work table is pivoted with respect to the column so as to be moved between the retracted position and the retracted position. The support arm is positioned at the storage position when the workbench is stored, so that the workbench and the adjuster mechanism can be prevented from malfunctioning due to travel vibrations, etc., and the workbench can be supported via the support arm. Can be securely stored and supported. On the other hand, when performing maintenance on the engine, the support arm is positioned at a retracted position outside the rotation locus of the cabin, thereby avoiding interference with the support arm when the cabin rotates upward, thereby maintaining the engine. Can be performed smoothly.

According to the aerial work vehicle according to the second aspect of the present invention, since the boom support is pivotally provided on the support for supporting the support arm, the support at the rear of the vehicle body is reduced to a single support, and the support is also used. Thus, the boom and the worktable can be efficiently stored and supported.

According to the third aspect of the present invention, since the position of the support arm is restricted to the workbench storage position, the support arm can be stored by rotating the support arm until the forward movement is restricted. The support arm can be easily positioned at the workbench storage position.

According to the fourth aspect of the present invention, the support arm is immovably secured at the worktable storage position by the securing means, so that the support arm is moved from the worktable storage position due to traveling vibration or the like. Can be surely prevented. In particular, if the position of the support arm is restricted to the worktable storage position by the position restricting means, the securing of the support arm by the securing means can be easily performed at the worktable storage position.

According to the fifth aspect of the present invention, the state in which the support arm is not positioned at the workbench storage position is detected by the detection means, and the worker is prohibited from storing the boom and the workbench. It is possible to improve the safety of the boom and the workbench during the storage operation.

Furthermore, according to the aerial work vehicle according to the sixth aspect of the present invention, the boom support is moved to the storage position in conjunction with the support arm, so that a cumbersome individual operation for individually positioning the boom support in the storage position is unnecessary. As a result, the turning function of the boom support portion can be eliminated and the parts required for the turning function can be shared.

[Brief description of the drawings]

FIG. 1 is a plan view of a front part of an aerial work platform showing a state where a cabin is turned upward after a support arm is moved to a retracted position.

FIG. 2 is a side view according to FIG.

FIG. 3 is a plan view of a front part of the aerial work vehicle, showing a state where a support arm is moved to a storage position.

FIG. 4 is a side view of the entire aerial work vehicle according to FIG. 3;

FIG. 5 is a plan view near the base end of the support arm.

FIG. 6 is a perspective view of the vicinity of the base end of the support arm as viewed obliquely from the left rear.

FIG. 7 is a cross-sectional view of an upper portion of a column cut near a long bolt.

[Explanation of symbols]

 Reference Signs List 1 aerial work vehicle 3 cabin 13 boom 15 bucket (work table) 31 support 32 support arm 41 boom support 42 position restricting means 45 securing means 51 detection switch (detection means) m vertical axis of support column X cabin rotation trajectory

Claims (6)

[Claims] A cabin provided at a front portion of the vehicle body so as to be rotatable upward, and a cabin provided at a rear portion of the vehicle body so as to be pivotable and undulating,
A work platform having a boom having a worktable at a tip thereof, and a column which is erected behind the cabin and which supports and stores at least the workbench of the boom and the worktable above the cabin, A support arm, which mounts the worktable at its tip, is provided on the support column in a substantially horizontal direction so as to be pivotable about a vertical axis of the support column. The support arm rotates the cabin when the worktable is stored. An aerial work vehicle that is adapted to move between a front storage position protruding into a locus range and a rear evacuation position retreating out of a cabin rotation locus range. 2. The aerial work vehicle according to claim 1, wherein a boom support portion for mounting and supporting the boom when the boom is stored is provided on the support so as to be pivotable about a vertical axis of the support. . 3. Between the support arm and the support,
The aerial work vehicle according to claim 1 or 2, further comprising a position regulating means for positioning the support arm at the workbench storage position. 4. Between the support arm and the support,
The aerial work vehicle according to any one of claims 1 to 3, further comprising securing means for securing the support arm immovably at the workbench storage position. 5. Between the support arm and the support,
5. A detecting means for detecting that the support arm is located at the workbench storage position.
The aerial work vehicle according to any one of the above. 6. The boom support portion is fixed to a base end of a support arm outside a rotation locus of the cabin,
3. The aerial work vehicle according to claim 2, wherein when the support arm moves to the workbench storage position, the support arm moves to the boom storage position in conjunction with the support arm.