JPH0520962U - Work vehicle center jack - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims at obtaining a center jack of a work vehicle capable of horizontally lifting the work vehicle. To this end, a center jack of a work vehicle in which an inner post is telescopically inserted into the center of gravity of a vehicle body with respect to an outer post and a base plate is rotatably attached to the lower surface of the inner post with respect to the inner post. The center jack is configured to be slidable in the front-rear direction of the vehicle body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work jack center jack capable of horizontally lifting a work vehicle.

[0002]

[Prior art]

 As shown in the figure, a work vehicle 20 (which will be described as an aerial work vehicle) having both road surface and track traveling functions travels on the front and rear tire wheels 21 during road surface traveling, and For running on 23, iron wheels 22 on the front, rear, left and right are installed on the track 23 so that they can be retracted to the rear of the front and rear tire wheels 21, and the running vehicle 20 contacts the rear tire wheels 21 on the track 23. Then, the driving force of the rear tire wheels 21 is utilized to travel to the work site.

[0003]

[Problems to be solved by the device]

 Therefore, the introduction from the road surface to the track 23 in the work vehicle 20 having both the conventional road surface traveling function and the track traveling function is performed by using, for example, a railroad crossing. The direction of the work vehicle 20 for getting on the track 23 is changed by moving up and down a center jack 25 with a turntable 25a provided at a substantially central position on the lower surface of the chassis frame 24.

That is, the direction of the work vehicle 20 is changed by extending the center jack 25 downward and grounding the work vehicle 20 to support the work vehicle 20, and pushing either of the front and rear of the work vehicle 20 with the vehicle body supported. When the work vehicle 20 is given a rotational force in one direction and the work vehicle 20 is oriented parallel to the track 23, the iron wheels 22 on the front, rear, left, and right are projected downward, and in this state, the center jack 25 is retracted and the front, rear, left, and right The iron wheels 22 and the rear tire wheels 21 are installed on the track 23 and travel along the track 23.

By the way, since the center jack 25 mounted on the conventional work vehicle 20 is fixedly mounted on the chassis frame 24, it is possible to load various equipments and the like that are mounted on the chassis to work at high places. The balance of the center jack 25 is unbalanced depending on the position to be loaded and the size of the load, and therefore the work vehicle 20 cannot be rotated unless a very large rotational force is applied to rotate the supported work vehicle 20. It had serious problems such as a cousin and sometimes it was impossible to rotate.

[0006]

[Means for Solving the Problems]

 The present invention has been made in view of the above-mentioned problems, and an object thereof is to obtain a center jack of a work vehicle capable of horizontally lifting the work vehicle. A center jack for a work vehicle in which an inner post is telescopically inserted into an outer post at the center of gravity and a base plate is rotatably attached to the lower surface of the inner post with respect to the inner post. Is configured to be slidable in the front-back direction of the vehicle body.

[0007]

[Action]

 Since the configuration described above has been adopted, the position of the center jack can be adjusted even if the position of the load to be mounted on the chassis of the work vehicle or the imbalance of the load causes the load on the center jack to be unbalanced. By moving it back and forth, the center of gravity of the work vehicle can be adjusted so as to be applied to the center jack, so that it is possible to maintain a stable balance on the center jack and easily change the direction of the work vehicle. ..

[0008]

【Example】

 An embodiment of the center jack for a work vehicle according to the present invention will be described in detail below with reference to FIGS. 1 and 2. In the figure, reference numeral 1 is a work vehicle that employs a center jack according to the present invention (in the present embodiment, an aerial work vehicle similar to the one disclosed in the conventional example will be described as an example). In the work vehicle 1, a subframe 3 is mounted on a chassis frame 2, a turntable 4 is mounted on the subframe 3, and the base end of a multistage boom 5 can be undulated on the turntable 4. The multi-stage boom 5 is pivotally mounted, and is hoisted by a hoisting cylinder 6 mounted between the turntable 4 and the base end boom, and is telescopically moved by a built-in telescopic cylinder (not shown in the figure). Equipped with a swingable workbench 7 that always maintains a horizontal state regardless of the hoisting angle of the multistage boom 5, and a center jack 8 at a position orthogonal to the chassis frame 2 at approximately the center of the lower surface of the chassis frame 2. Equipped.

Further, front and rear tire wheels 9 for traveling on a road surface are provided on the front, rear, left and right of the work vehicle 1, and behind each tire wheel 9 are front, rear, left and right for traveling on a track 10. An iron wheel 11 is equipped so that it can appear and disappear. By the way, in the center jack 8, an inner post 8b is telescopically inserted into a pair of left and right outer posts 8a, and a built-in jack cylinder (not shown) extends and contracts to the inner post 8a. The post 8b is configured to expand and contract in the upward and downward directions.

A fixed side plate A directly fixed to the inner post 8b is provided on the lower surface of the inner post 8b, and a horizontal direction is provided on the lower surface of the fixed side plate A via rotating means (not shown in the figure) such as a bearing. A base plate 8c composed of a rotation side plate B rotatably attached to the base plate 8c is attached to the base plate 8c. The center jack 8 is attached to the chassis frame 2 by, for example, inserting a guide roller 2b attached to a side surface of the outer post 8a into a guide groove 2a provided on the outside of the chassis frame 2 in parallel with the chassis frame 2, The entire center jack 8 is mounted so as to be movable in the front-rear direction along the guide groove 2a. To move the center jack 8 in the front-rear direction, the rod 12a is attached to the chassis frame 2 and the bottom 12b is attached to the front side surface of the outer post 8a. The cylinder 12 is configured to extend and contract.

As described in the conventional example, the transition of the work vehicle 1 from traveling on the road surface to traveling using the track 10 supports the work vehicle 1 by extending the center jack 8 downward to ground. Then, by pushing either one of the front and rear of the work vehicle 1 while supporting the vehicle body, a unidirectional rotational force is applied to the work vehicle 1 so that the work vehicle 1 is oriented parallel to the track 10 and The left and right iron wheels 11 are projected downward, the center jack 8 is stored in this state, and the front, rear, left and right iron wheels 11 and the rear tire wheels 9 are installed on the track 10, and travels along the track 10.

The operation of the center jack of the work vehicle according to the present invention will be described below based on the above configuration. That is, since the work vehicle 1 adopting the center jack according to the present invention is provided with the front and rear tire wheels 9 and the front and rear and left and right iron wheels 11 which can be retracted, the work vehicle 1 runs along the road surface and the track 10. It has both traveling functions.

Now, when the work vehicle 1 travels from the road surface to the travel using the track 10, the engine is stopped, the center jack 8 is extended downward, and the base plate 8c attached to the lower surface of the inner post 8b is removed. The work vehicle 1 is supported by being grounded, and by pushing one of the front and rear of the work vehicle 1 with the vehicle body being supported, a rotational force in one direction is applied to the work vehicle 1 so that the work vehicle 1 becomes parallel to the track 10. In this state, the front, rear, left and right iron wheels 11 are projected downward, and in this state, the center jack 8 is stored, that is, the inner post 8b is stored inside the outer post 8a, and the front, rear, left and right iron wheels 11 and the rear tire wheels 9 are stored. Installed on the track 10, the engine of the work vehicle 1 is driven to rotate the rear tire wheels 9 in the same manner as when the road surface is traveled, and frictional force is applied to the track 10 to travel along the track 10.

By the way, when the work vehicle 1 is turned around to travel along the track 10 from the road surface traveling, various equipment loaded on the work vehicle 1 extends the center jack 8 downward. When the base plate 8c attached to the lower surface of the inner post 8b is grounded and the work vehicle 1 is supported in an orderly manner, the center of gravity of the work vehicle 1 coincides with the position of the center jack 8. However, if there is an imbalance in the loading position or the loading load of the work vehicle 1, the position of the center of gravity of the work vehicle 1 does not match the mounting position of the center jack 8 and is therefore biased toward the center jack 8. Due to the load, it becomes difficult to change the direction of the work vehicle 1, but the center jack 8 of the present invention is mounted on the chassis frame 2 in the guide groove 2a and the guide roller 2b. Since the cylinder 12 is inserted and inserted so as to be movable back and forth along the guide groove 2a and the cylinder 12 is arranged between the chassis frame 2 and the center jack 8, the center of gravity of the work vehicle 1 and the mounting position of the center jack 8 are If they do not match, the cylinder 12 can be expanded / contracted to move the position of the center jack 8 back and forth so that the center of gravity of the work vehicle 1 and the mounting position of the center jack 8 can match. It is possible to easily change the direction of the work vehicle 1 while keeping the balance on the center jack 8 stable without being influenced by the imbalance of the applied load.

In the above-described embodiment, the configuration and operation have been described assuming a work vehicle (track safety vehicle) having both road surface traveling function and track traveling function, but only the road surface traveling function is described. The present invention may be applied to a work vehicle or, conversely, a track guard vehicle that runs only on a track, and is not particularly limited to the above embodiment.

[0016]

[Effect of the device]

 In the present invention, as described in detail above, the inner post is telescopically inserted in the center of gravity of the vehicle body with respect to the outer post, and the base plate is rotatably attached to the lower surface of the inner post with respect to the inner post. Since it is a center jack for a work vehicle and the center jack is configured to be slidable in the front-rear direction of the vehicle body, it is possible to adjust the position of the load to be loaded on the chassis or the deviation of the load by Even if the mounting position of the center jack and the center of gravity of the work vehicle do not match, the center of gravity of the work vehicle and the mounting position of the center jack can be matched by moving the center jack. It has various excellent effects such as extremely small rotation force and extremely easy rotation.

[Brief description of drawings]

FIG. 1 is a side view showing a center jack of a work vehicle according to the present invention.

FIG. 2 is an explanatory view of the direction change of the work vehicle adopting the center jack.

FIG. 3 is a side view showing a center jack of a conventional work vehicle.

[Explanation of symbols]

 1 work vehicle 2 chassis frame 2a guide groove 2b guide roller 3 subframe 4 turntable 5 multi-stage boom 6 hoisting cylinder 7 workbench 8 center jack 8a outer post 8b inner post 8c base plate A fixed side plate B rotating side plate 9 front and rear Tire wheel 10 Track 11 Front, rear, left and right iron wheels 12 Cylinder 12a Lot 12b Bottom

Claims (1)

[Scope of utility model registration request] 1. A center jack for a working vehicle in which an inner post is telescopically inserted into an outer post at a center of gravity of a vehicle body, and a base plate is rotatably attached to a lower surface of the inner post with respect to the inner post. There
A center jack for a working vehicle, wherein the center jack is configured to be slidable in the front-rear direction of the vehicle body.