JP2002255490A - Device for controlling operation of jack of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a jack from abutting against a fuel tank even when the jack is erroneously operated for a vehicle having the jack above the tank. SOLUTION: This device comprises an extension sensor 81b for detecting if the jack is at an extension position, an expansion/contraction sensor 83b for detecting if the jack is in a full contraction state, and a jack switch 97 and a slide switch 96 operatively associated with operation of an operating lever of a jack operation device. When the jack is at other than the extension position, the extension sensor 81 disconnects an extension lien L4 and restricts the extension of the jack even if the lever erroneously operated and the jack switch 97 is connected with an extension terminal 97b. When the jack is in other than the full contraction state, the expansion/contraction sensor 83b disconnects a containing line L3 and restricts a move of the jack to a containing position side even if the lever is mistakingly operated and the slide switch 96 is connected with a containing terminal 96c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack operation control device for a work vehicle, and more particularly, to a jack operation control device for a work vehicle that controls the operation of a jack that lifts and supports a vehicle body.

[0002]

2. Description of the Related Art An aerial work vehicle for performing aerial work is provided with a driving cabin disposed at a front portion of a chassis frame extending in a front-rear direction and on a chassis frame located on a vehicle rear side of the driving cabin. A sub-frame, a boom mounted on the sub-frame to be able to pivot, extend and retract, and have a workbench at its tip, and the vehicle falls over due to an increase in the moment in the overturning direction acting on the vehicle due to the operation of the boom In order to prevent the possibility of occurrence, there is an outrigger jack which is attached to the front and rear left and right sides of the subframe and lifts and supports the vehicle.

A pair of left and right front wheels are rotatably mounted on a chassis frame extending below the driving cabin of the aerial work vehicle, and a pair of left and right front wheels are mounted on a chassis frame on the rear side of the vehicle. Rear wheel is rotatably mounted. A fuel tank for storing a battery and light oil is mounted on a left side surface of the chassis frame between the front wheel and the rear wheel in the left-right direction in a front-rear direction. In addition, a gap is formed between the left rear end of the driving cabin and the battery, and an outrigger jack on the front left side of the vehicle is arranged in this gap and attached to the subframe. Further, a gap is formed between the right rear end of the driving cabin and the front end of the subframe, and an outrigger jack on the right front side of the vehicle is disposed in the gap and attached to the subframe. Further, outrigger jacks are attached to both left and right ends of the subframe on the vehicle rear side with respect to the rear wheels.

Here, the outrigger jack is provided in the vehicle left-right direction and configured to be able to protrude in the vehicle left-right direction, and is attached to the tip end of the outrigger beam so as to be able to expand and contract vertically. And a jack.

[0005]

However, compressed natural gas (Compressed N gas) is used instead of light oil as fuel for vehicles.
When using atural gas, the volume of the vehicle must be larger than that of the fuel tank for light oil in order to make the mileage of the vehicle the same as that of light oil. as a result,
The length of the fuel tank attached to the chassis frame between the front wheels and the rear wheels in the vehicle front-rear direction becomes longer, and there is no place to attach the outrigger jack on the front left side of the vehicle. Therefore, it has been proposed to install a reduced outrigger jack above the fuel tank and inside the vehicle.

However, according to this proposal, when extending the outrigger jack at the storage position, it is necessary to perform an extending operation of extending the outrigger beam outward and then extending the jack downward. If the order is wrong, the jack may come into contact with the fuel tank or the like to damage them.

Further, when the outrigger jack is retracted into the vehicle from a state where the vehicle is lifted and supported by the outrigger jack, it is necessary to perform a retracting operation for moving the outrigger beam inward after moving the jack to the contracted state. If the order of the storing operation is wrong, there is a possibility that the jack contacts the fuel tank or the like and damages them.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem. In a vehicle in which a fuel tank for natural gas is mounted on a vehicle and a jack is disposed above the fuel tank or the like, the jack operation is performed. An object of the present invention is to provide a jack operation control device for a working vehicle in which a jack is not likely to abut a fuel tank or the like even if it is erroneous.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, a jack operation control device for a working vehicle according to the present invention is a vehicle having a chassis frame extending in the front-rear direction (for example, the working vehicle 1 in the embodiment). And equipment such as a fuel tank (for example, the fuel gas tank 15 and the battery B in the embodiment) mounted on at least one side in the left-right direction of the chassis frame, and mounted on the vehicle, above the mounted components and above the vehicle Is configured to be movable between a storage position on the inner side in the left-right direction and an overhang position on the outer side in the left-right direction of the vehicle, and can be moved to the storage position in a contracted state and extend downward at the overhang position (for example, in the embodiment). And a jack moving device (for example, in the embodiment) for moving the jack between the storage position and the overhang position in a contracted state. Jack swing motor 49) and a jack actuation control device for a working vehicle comprising a. Here, the jack operation control device includes an overhang position detecting unit (for example, the overhang sensor 81d in the embodiment) that detects the position of the jack in the overhanging direction, and an expansion and contraction state detecting unit (for example, that detects the expansion and contraction state of the jack). The extension sensor 83d) in the embodiment, the extension movement restriction of the jack when it is detected that the jack is located above the equipment by the overhang position detection means, and the jack downward by the extension state detection means. An operation regulation control unit (for example, regulation circuits 91 and 9 in the embodiment) that regulates at least one of regulation of the jack moving device toward the storage position side by the jack moving device when it is detected that the jack is extended.
2, 93, 94).

According to the jack operation control device for a working vehicle having the above structure, when the overhanging position detecting means detects that the jack is located above the equipment, the jack can be extended downward. Operation regulation control means regulates the operation. Also, when the expansion / contraction state detecting means detects that the jack is extended downward,
Even if the jack is moved to the storage position, the jack moving device restricts the movement. The operation restriction by the operation restriction control means is at least one of restriction of extension movement of the jack downward and restriction of movement of the jack toward the storage position.

For this reason, it is possible to prevent the jack from coming into contact with the equipment due to the downward extension movement of the jack or the movement of the jack toward the storage position, and
By restricting the operation of the jack, the operator who operates the jack notices that the jack operation has been erroneously performed, so that the jack operation can be always and reliably performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. The present embodiment shows a form of an aerial work vehicle having a movable vehicle having a boom having a work table at a tip end. First, before describing the jack operation control device according to the present invention, an aerial work vehicle equipped with the jack operation control device will be described.

An aerial work vehicle 1 shown in FIG. 1 is constructed based on a truck vehicle 3 shown in FIG. Truck vehicle 3
As shown in FIG. 2, a pair of front wheels 7 and a rear wheel 9 can be arranged at both front and rear left and right ends of a chassis frame 5 extending in the front-rear direction, and the vehicle can run. 11. Front wheel 7 and rear wheel 9
A pair of fuel gas tanks 15 and 16 filled with compressed natural gas are attached to both left and right side walls of the chassis frame 5 therebetween. The fuel gas tanks 15 and 16 extend in the front-rear direction of the vehicle, and the front ends of the fuel gas tanks 15 and 16 are disposed at a position having a predetermined gap on the vehicle rear side from the rear end of the driving cabin 11, and the rear ends are It is arranged at a position having a predetermined gap on the vehicle front side with respect to the rear wheel 9. A cover 17 for covering the fuel gas tanks 15 and 16 is detachably attached to the outside thereof. Fuel gas tank 1 on left side of vehicle
The cover 17 covering the cover 5 extends to near the rear end of the driving cabin 11.

A fuel hose H connected to the engine E is connected to the front end of the fuel gas tank 15 on the left side of the vehicle (the lower side in FIG. 2A). A battery B is disposed in the gap between the front end of the fuel gas tank 16 on the right side of the vehicle and the driving cabin 11 and is attached to the chassis frame 5.

As shown in FIG. 1B, a sub-frame 19 is mounted on the chassis frame 5 on the vehicle rear side with respect to the driving cabin 11. A swivel table 21 that is driven by a swivel motor (not shown) and is configured to be horizontally swivelable is provided at a central portion of the sub-frame 19 on the vehicle front side. A boom 23 having a base end pivotally connected to the revolving base 21 and configured to be able to expand and contract is attached to the swivel base 21, and the boom 23 is configured to be moved up and down by an up / down cylinder 25. At the tip of boom 23, boom 2
Work table 2 which is kept horizontal regardless of the undulation angle of 3
7 is attached. Tool boxes 29, 30 extending in the vehicle front-rear direction are mounted on the sub-frame 19 above each of the fuel tanks 15, 16.

A front jack 40 in a stored state is disposed between the front ends of the tool boxes 29 and 30 and the rear end of the operating cabin 11 and above the battery B and the fuel gas tank 15. . When the front jack 40 is stored in the vehicle, the front jack 40 is inside the vehicle in the left-right direction. As shown in FIG. 3, the front jack 40 is attached to the front side of the sub-frame 19 and extends outward in the left-right direction of the vehicle. Jack post 43,
The horizontal arm 45 is connected to the jack post 43 and extends in the horizontal direction. The first arm 47 is connected to the tip of the horizontal arm 45 and extends in the vertical direction. The jack post 43 is connected to a jack turning motor 49 that turns the first jack 47 through a horizontal arm 45 to turn the first post 47.

The first jack 47 has an outer post 47a extending in the vertical direction, and an inner post 47b configured to be vertically movable in the outer post 47a.
A pad base 47c pivotally connected to the lower end of the inner post 47b and extending in the horizontal direction;
and a jack cylinder 50 for extending and retracting the inner post 47b with respect to a.

The support portion 41 has a rectangular notch 53 which is a tip end thereof and is opened to the rear side of the vehicle inside the rotation center P1 of the jack post 43, and the notch 53
The first jack 47 is accommodated therein. When the first jack 47 is accommodated in the notch 53, the first jack 47 is in a fully contracted state, and the pad base 47c of the first jack 47 is positioned above the battery B (mounted component) and the fuel. It is located above the gas tank 15 (mounted component). Hereinafter, the first jack 47 in a plan view when the first jack 47 is housed in the notch 53 will be described.
The position of the jack 47 is referred to as the “storage position” of the front jack 40.

When the front jack 40 is in the retracted position, the position of the center axis of the outer post 47a is shifted by a distance X toward the vehicle rear side from the position of the center axis passing through the center P1 of the jack post 43. In position. The front jack 40 can pivot from the storage position and move to the extended position outside the vehicle. Here, the overhang position is set when the first jack 47 turns to the outside of the vehicle.
The position of the center axis of a is a position shifted by the distance X toward the vehicle front side from the position of the center axis of rotation passing through the center of rotation of the jack post 43.

As shown in FIG. 1B, rear jacks 60 are mounted on the left and right sides of the subframe 19 on the vehicle rear side of the rear wheels 9. The rear jack 60 is shown in FIG.
As shown in the figure, an outrigger beam 61 arranged in the vehicle left-right direction and configured to be able to protrude in the vehicle left-right direction, and a second jack 62 configured to be able to expand and contract in the up-down direction at the tip of the outrigger beam 61 And is configured. A pad base 62a is provided at the lower end of the second jack 62.
Is pivoted. The rear jack 60 is stored at a predetermined position inside the sub-frame 19 with the second jack 62 fully retracted (hereinafter, this position is referred to as a "storage position of the rear jack 60"). Further, the position of the second jack 62 in a plan view when the outrigger beam 61 is extended from the storage position by a predetermined length is referred to as the extended position of the rear jack 60.

At the rear end of the subframe 19, FIG.
As shown in (a), the front jack 40 and the rear jack 6
A jack operating device 70 for operating the zero drive is attached. The jack operating device 70 includes a first operating lever 71, a second operating lever 72, and a third operating lever 7 from the left side of the vehicle.
3, a fourth operation lever 74 and a fifth operation lever 75,
Each of the operation levers 71, 72, 73, 74, and 75 can be tilted in the front-rear direction of the vehicle, and is configured to be in a neutral state and in an upright state. The first operation lever 71 operates the front jack 40 at the front right of the vehicle.
When the first operation lever 71 is tilted to the front side of the vehicle, the front jack 40 can move in the left-right direction of the vehicle. In this state, when the third operation lever 73 is tilted to the front side of the vehicle, the front jack 40 moves to the outside of the vehicle. The front jack 40 moves when the third operation lever 73 is tilted to the rear side of the vehicle.
Is configured to move to the inside of the vehicle. The second
The operation lever 72 operates the front jack 40 at the front left of the vehicle, and the fourth operation lever 74 operates the rear jack 60 at the rear right of the vehicle.
, And the fifth operation lever 75 operates the rear jack 60 at the rear left of the vehicle. In addition, since the operation method of the second operation lever 72, the fourth operation lever 74, and the fifth operation lever 75 is the same as that of the first operation lever 71, the description is omitted. These operation levers 71, 72, 7
The front jack 40 and the rear jack 6 are operated via the jack operation control device 80 shown in FIG.
0 operates.

Next, the jack operation control device 80 will be described. As shown in FIG. 5, the jack operation control device 80 has an operation signal restriction circuit 87 for restricting an operation signal from the jack operation device 70, and a controller 85 for controlling the operations of the front jack 40 and the rear jack 60. It is configured. The operation signal restriction circuit 87 includes an overhang sensor 81 that detects whether the front jack 40 and the rear jack 60 are at the overhang position, and the first jack 47 and the first jack 47 of the front jack 40 illustrated in FIG. Rear jack 60 shown in
The second jack 62 has an expansion / contraction sensor 83 for detecting whether or not the second jack 62 is in a contracted state, and regulating circuits 91, 92, 93, 94 including these sensors 81, 83. Here, the overhang sensor 81 and the extension sensor 83 are limit switches. Note that the overhang sensor 81 and the extension sensor 83 are not limited to limit switches,
It may have a function of detecting the extension amount of the first jack 47 shown in (a) and the second jack 62 shown in FIG. In this case, the controller 85 determines whether the first jack 47 is at the extended position and the second jack 62 is in the contracted state based on the detection value from the sensor.

Hereinafter, the overhang sensor 81 attached to the support portion 41 shown in FIG. 3A disposed on the left front side of the vehicle is referred to as a left front overhang sensor 81a, and is disposed on the right front side of the vehicle. The overhang sensor 81 attached to the support portion 41 shown in FIG. 3A is referred to as a front right overhang sensor 81b, and the subframe 1 shown in FIG.
9 is attached to the left rear overhang sensor 8.
1c, the overhang sensor 81 attached to the rear jack 60 shown in FIG. 4 disposed on the right rear side of the vehicle is referred to as a right rear overhang sensor 81d. In addition, as with the extension sensor 81, the extension / retraction sensor 83 will be described below in accordance with the positions of the front jack 40 and the rear jack 60.
The right front expansion sensor 83b, the left rear expansion sensor 83c, and the right rear expansion sensor 83d are described.

As shown in FIG. 6, the operation signal regulating circuit 87 is connected to each of the first operation lever 71, the second operation lever 72, the fourth operation lever 74, and the fifth operation lever 75 shown in FIG. It has four regulating circuits 91, 92, 93, and 94 that operate according to the operation of the third operation lever 73. Since these four regulating circuits 91, 92, 93, and 94 have the same configuration, only the regulating circuit 91 connected to the first operation lever 71 will be described, and the other regulating circuits 92, 9 will be described.
Descriptions of 3, 94 are omitted. Regulation circuit 91
Is a power supply 95 and a power supply line L connected to the power supply 95.
One. The power supply line L1 branches on the downstream side, one of which is electrically connected to the slide switch 96,
The other is electrically connected to jack switch 97. When the first operation lever 71 shown in FIG. 1A is tilted to the front of the vehicle and the third operation lever 73 is further tilted to the front or rear of the vehicle, the slide switch 96 is turned on.
The switch portion 96a of the slide switch 96 is configured to come into contact with the extension terminal 96b or the storage terminal 96c according to the content of the tilt operation of the third operation lever 73.

An overhang line L2 is connected to the overhang terminal 96b, a storage line L3 is connected to the storage terminal 96c,
These lines L2 and L3 are electrically connected to the controller 85. The overhang line L2 and the storage line L3 are provided with a limit switch which is a right front expansion / contraction sensor 83b. The ON / OFF operation of the limit switch electrically connects or disconnects the overhang line L2 and the storage line L3. It is configured as follows.

When the third operation lever 73 is tilted to the front or rear of the vehicle when the first operation lever 71 shown in FIG. (3) The switch portion 97a of the jack switch 97 is extended according to the tilting operation of the operating lever 73.
7b or the reduced terminal 97c.

The extension terminal 97b is connected to an extension line L4, the reduction terminal 97c is connected to a reduction line L5,
These lines L4 and L5 are electrically connected to the controller 85. The extension line L4 is provided with a limit switch, which is the right front extension sensor 81b, and is configured such that the extension line L4 is electrically connected or disconnected by ON / OFF operation of the limit switch.

Next, regarding the operation of the jack operation control device 80 according to the present invention, a jack extension operation for lifting and supporting the vehicle by the front jack 40 and the rear jack 60 and a jack for storing the front jack 40 and the rear jack 60 in the vehicle. The storage operation will be described. First, the jack extension operation will be described. When the jack-overhanging operation is performed, as shown in FIGS. 1A and 1B, the front jack 40 and the rear jack 60 are stored in the vehicle, and the boom 23 is stored on the sub-frame 19. It is assumed that the aerial work vehicle 1 has been moved to the work site in this state.

When the aerial work vehicle 1 arrives at the work site, a worker (not shown) moves to the rear side of the vehicle and operates the operation lever of the jack operating device 70. That is, the first worker
After each of the operation lever 71, the second operation lever 72, the fourth operation lever 74, and the fifth operation lever 75 is tilted to the front of the vehicle, the third operation lever 73 is tilted to the front of the vehicle. As a result, FIG.
The switch portion 96a of the slide switch 96 in the regulation circuit 91 connected to the first operation lever 71 is connected to the extension terminal 96b.
And the power line L1 and the overhang line L2 are electrically connected. Here, since the first jack 47 of the front jack 40 at the front right of the vehicle shown in FIG. 7A is in a fully contracted state,
The right front expansion / contraction sensor 83b is in an ON state, and as a result, the overhang line L2 is in a connected state. Therefore, the power supply 9
5 from the power line L1 and the overhang line L2.
Is sent to the controller 85 through the controller 85 and receives the electric signal.
The operation of the operation control valve V2 connected to the right front jack turning motor 49 shown in FIG.
Is driven to rotate. As a result, as shown in FIG. 7 (b), the first jack 47 of the front right front jack 40 pivots and moves to the overhang position. At the same time as the front right front jack 40 moves, as shown in FIG. 5, the left front jack cylinder 50 extends and the left front first jack 47 shown in FIG. Go to Figure 1
(B) and the beam cylinder 6 built in the outrigger beam 61 of the rear left and rear right jacks 60 shown in FIG.
4 also extends, and the second jack 62 moves to the extended position.

Here, as shown in FIG. 7A, when the front jack 40 at the front right of the vehicle is in the storage position, the operator erroneously operates the first operation lever 71 shown in FIG. 1A (operation for bringing the first jack 47 into an operable state), and thereafter, the third jack shown in FIG.
A case in which the operation lever 73 is tilted toward the front of the vehicle (operation for extending the first jack 47) will be described. When the first operation lever 71 shown in FIG. 1B is tilted to the rear side of the vehicle, the jack switch 97 becomes operable as shown in FIG. Then, FIG.
The switch portion 97a of the jack switch 97 comes into contact with the extension terminal 97b by the tilting operation of the third operation lever 73 toward the front side of the vehicle, and the power line L1 and the extension line L4 are electrically connected. However, since the first jack 47 of the front jack 40 shown in FIG. 7A is in the storage position, the right front overhang sensor 81b is in the OFF state and interrupts the extension line L4. As a result, the electric signal is not transmitted to the controller 85, and the first jack 47 does not extend. As a result, the possibility that the first jack 47 comes into contact with the vehicle can be prevented. In addition, erroneous operations of the second operation lever 72, the fourth operation lever 74, and the fifth operation lever 75 shown in FIG. 1A are the same as those of the first operation lever 71 described above, and the description thereof will be omitted.

Now, as shown in FIGS. 7B and 4,
The first jack 47 of the front jack 40 and the rear jack 60
When the second jack 62 moves to the extended position, the worker (not shown) moves the third operation lever 7 as shown in FIG.
Return 3 to neutral. Then, after each of the first operation lever 71, the second operation lever 72, the fourth operation lever 74, and the fifth operation lever 75 is tilted toward the vehicle rear side, the third operation lever 71
The operation lever 73 is tilted again to the front of the vehicle. As a result, the jack switch 9 in the regulating circuit 91 connected to the first operation lever 71 will be further described with reference to FIG.
The switch portion 97a of 7 contacts the extension terminal 97b, and electrically connects the power supply line L1 and the extension line L4. Here, since the first jack 47 of the front jack 40 at the front right of the vehicle is at the overhang position, the right front overhang sensor 81b is in the ON state, and the extension line L4 is connected. For this reason, the electric signal from the power supply 95 is sent to the controller 85 through the extension line L4, and the controller 85 having received the electric signal is connected to the right front jack cylinder 50 shown in FIG. 5 according to the electric signal. The operation of the operation control valve V2 is controlled to extend the right front jack cylinder 50. As a result, as shown in FIG.
The 0 first jack 47 extends and touches the ground to lift the front right wheel 7 on the right front side of the vehicle. As shown in FIG. 5, the front left jack cylinder 50 also extends to lift the front left wheel 7 shown in FIG. 1B, and the jack cylinder 63 of the rear left and right rear jack 60 also moves. Fig. 1 (b)
The rear wheel 9 shown in FIG. As a result, the vehicle is lifted and supported, and the jack extension operation ends.

Next, the jack storing operation will be described. As shown in FIG. 1, an unillustrated worker operates a first operating lever 71 and a second operating lever 7 of the jack operating device 70.
2. After tilting each of the fourth operation lever 74 and the fifth operation lever 75 toward the vehicle rear side, the third operation lever 73
Is tilted toward the rear of the vehicle. As a result, referring to FIG. 6, the switch 97a of the jack switch 97 in the regulating circuit 91 connected to the first operation lever 71 comes into contact with the reduction terminal 97c, and the power supply line L1 and the reduction line L5 are electrically connected. Connection. Here, since the reduction line L5 is electrically connected to the controller 85, an electric signal from the power supply 95 is sent to the controller 85 through the reduction line L5. Then, the controller 85 having received the electric signal responds to the electric signal and operates the operation control valve V2 connected to the right front jack cylinder 50 shown in FIG.
Is operated to reduce the right front jack cylinder 50. As a result, as shown in FIG. 7B, the first jack 47 moves down and returns to the extended position. In addition, the first jack 47 of the front jack 40 on the left front, and the second jack 62 of the rear left and right rear jacks 60 shown in FIGS. 1B and 4 also shrink and return to the extended position.

Here, the first of the front jack 40 on the right front of the vehicle
A case where an erroneous operation of moving the front right jack 40 to the storage position in a state where the expansion and contraction movement is stopped before the jack 47 is fully contracted (hereinafter, referred to as a “non-fully contracted state”) is performed. explain. Since the first jack 47 of the front right front jack 40 is in the non-fully contracted state, as shown in FIG. 6, the right front expansion / contraction sensor 83b is in the OFF state, and the storage line L3 is in the cutoff state. As a result, even if an operation of turning the front right front jack 40 to the storage position is performed in this state, the electric signal from the power supply 95 is not transmitted to the controller 85, so that the front jack 40 in the non-fully contracted state is moved from the extended position. It does not pivot to the storage position. Also, the first jack 47 of the front left front jack 40 shown in FIG. 7 (b) and the second jack 62 of the rear left and right rear jack 60 shown in FIG. 1 (b) and FIG. Even if an operation to move them to the storage position side is performed at one time, the movement is restricted. For this reason, even if the operator erroneously performs the jack operation in the jack storage operation, there is no possibility that the front jack 40 and the rear jack 60 will abut on the vehicle, and damage to the vehicle can be prevented.

In the above-described embodiment, an example is shown in which the movement and extension of the first jack 47 are restricted according to the position and the contracted state of the front jack 40. However, the present invention is not limited to this. As described above, the jack extension operation and the jack storage operation may be automatically performed in a predetermined order. That is, in the jack extension operation, as shown in FIGS. 7 and 8, the first jack 47 is extended after the front jack 40 at the storage position is moved to the extension position. In the jack storage operation, the grounded front jack 4
Then, the front jack 40 is moved from the extended position to the retracted position by moving the front jack 40 from the extended position to the fully retracted state. As described above, by automatically performing the jack extension operation and the jack storage operation as a predetermined sequential operation, it is possible to prevent the possibility that the front jack 40 contacts the vehicle and damages the vehicle.

In the above-described embodiment, FIG.
As shown in (b), when the rear jack 60 is stored in the vehicle, there is no vehicle mounted below the second jack 62, and even if the second jack 62 is extended and moved in this state, the second jack 62 does not move. There is no possibility that the jack 62 comes into contact with a vehicle-mounted object or the like. Further, even if the second jack 62 is brought into the non-fully contracted state from the state where the rear jack 60 is in contact with the ground, and is moved to the storage position side in this state, there is no possibility that the second jack 62 comes into contact with a vehicle-mounted object or the like. Therefore, in the jack operation of the rear jack 60, the operation of the rear jack 60 may not be restricted. In this case, the regulation circuit 9 shown in FIG.
The overhang sensor 81 and the extension sensor 83 in 3, 94 are omitted. Furthermore, in the above-described embodiment, the rear jack 60 is shown as a jack having an overhang, but the present invention is not limited to this, and a jack without an overhang may be used.

[0036]

As described above, according to the working vehicle of the present invention, when the jack is detected as being located above the above-mentioned devices by the overhang position detecting means, the jack extends downward. By regulating at least one of the regulation and the regulation of the jack moving device toward the storage position side by the jack moving device when the jack is detected to be extended downward by the expansion / contraction state detection means,
The possibility of the jack coming into contact with equipment etc. can be prevented beforehand, and since the operation of the jack is regulated, the operator who operates the jack will notice that the jack operation has been performed incorrectly, so always operate the jack. And it can be performed reliably.

[Brief description of the drawings]

FIG. 1 shows an aerial work vehicle equipped with a jack operation control device according to an embodiment of the present invention. FIG. 1 (a) is a plan view of the aerial work vehicle, and FIG. It is a front view of a working vehicle.

FIGS. 2A and 2B show a truck vehicle serving as a base of an aerial work vehicle according to an embodiment of the present invention. FIG. 2A is a plan view of the truck vehicle, and FIG. 2B is a front view of the truck vehicle. It is.

3A and 3B show a front jack according to an embodiment of the present invention. FIG. 3A is a perspective view of the front jack, and FIG. 3B is a plan view of the front jack.

FIG. 4 is a front view of the rear jack according to the embodiment of the present invention.

FIG. 5 is a block diagram showing a jack operation control device according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating an operation signal restriction circuit according to one embodiment of the present invention.

FIG. 7 is a diagram for explaining the operation of the jack operation control device according to the embodiment of the present invention.

FIG. 8 is a diagram for explaining the operation of the jack operation control device according to the embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 1 aerial work vehicle (vehicle, work vehicle) 5 chassis frame 15 fuel gas tank (equipment) 40 front jack (jack) 49 jack turning motor (jack moving device) 80 jack operation control device 81 overhang sensor (overhang position) Detection means) 83 Expansion / contraction sensor (Expansion state detection means) 91, 92, 93, 94 Regulation circuit (Operation restriction control means) B Battery (equipment)

Continued on the front page (72) Inventor Kenji Ochiai 1015-2, Yamashita, Ryoke, Ryoji, Ageo-shi, Saitama F-term in Aichi Corporation Ageo Works (reference) 3F333 AA08 AB04 CA15 CA30 DA05 DB10 FA28 FD04 FD20

Claims (1)

[Claims] 1. A vehicle having a chassis frame extending in the front-rear direction, equipment such as a fuel tank mounted on at least one side surface of the chassis frame in the left-right direction, and Is also configured to be movable upwardly between a storage position inside the vehicle in the left-right direction and an overhang position outside the vehicle in the left-right direction, and is movable to the storage position in a contracted state and extends downward at the overhang position. A jack operation control device for a working vehicle, comprising: a jack capable of moving; and a jack moving device that moves the jack between the storage position and the overhang position in a contracted state. Projecting position detecting means for detecting the position in the direction; expanding and contracting state detecting means for detecting the expanding and contracting state of the jack; and the jack by the extending position detecting means. Is controlled to extend downward when the jack is detected to be located above the equipment, and the jack when the jack is detected to be extended downward by the expansion / contraction state detecting means. Operation control means for restricting at least one of movement restrictions of the jack to the storage position by a moving device, and a jack operation control device for a working vehicle.