JP4804123B2 - Support device for work vehicle - Google Patents

Description

  The present invention relates to a support device for a work vehicle.

As a support device for this type of work vehicle, an aerial work vehicle having a support device having a roller and a ground plate is known. As shown in FIG. 4, the support device provided in the aerial work vehicle has a jack 12 that is attached to the vehicle body and supports the vehicle body, and is rotatably supported by the lower end portion of the jack 12 and is grounded. A roller 16 and a jack base 20 attached to the lower end of the jack 12 and having a grounding plate 22 that can be grounded instead of the roller 16 are provided. The jack base 20 is pivoted about the pivot shaft 15 so that the ground plate 22 covers the lower surface of the roller 16 (the state shown in FIG. 4A) and the retracted position (exposes the lower surface of the roller). 4 (b)), the ground plate 22 is grounded at the plate installation position, and the roller 16 is grounded at the retracted position to support the vehicle body. (For example, see Patent Document 1)
JP 2000-118367 A (page 3 to page 4, FIGS. 3 and 4)

However, in the aerial work vehicle described above, it is necessary to swing the jack base 20 to the plate installation position or the retracted position depending on whether the roller 16 is grounded or the ground plate 22 is grounded. It is necessary to lock or engage the plunger pin 35 at the plate installation position or the retracted position, which is troublesome.

  An object of this invention is to provide the support apparatus of the work vehicle which solved such a subject.

  In order to achieve the above object, a work vehicle support device according to claim 1 according to the present invention is provided with a jack attached to a vehicle frame and capable of extending and retracting a tip portion downward, and a frame having one end close to the jack. A link that is pivotally supported, an arm that pivotally supports the other end of the link and the tip of the jack, and swings around the pivotal axis of the link by expansion and contraction of the jack. A roller and a swingable ground plate are arranged, and when the jack is being reduced, the roller and the ground plate are retracted, and in the middle of the extension of the jack, the roller is grounded and the roller is grounded. In the extension of the jack, the position of the roller and the ground plate arranged on the arm is determined so as to be in the ground plate ground state in which the ground plate is grounded instead of the roller. It is an butterfly.

  The support device for a work vehicle according to the first aspect of the present invention is in a retracted state in which the roller and the ground plate are retracted when the jack is contracted, and in a roller grounded state in which the roller is grounded to the ground during the extension of the jack. In the extension of the jack, the position of the roller and the ground plate placed on the arm is determined so that the ground plate is grounded instead of the roller, so that the ground plate is grounded. By doing so, each of the retracted state, the roller grounding, and the grounding plate grounding can be achieved, and troublesome operations can be eliminated.

  In the following description of an embodiment of a work vehicle support device according to the present invention, the work vehicle is implemented in an aerial work vehicle equipped with a work table at the tip of a telescopic boom disposed on the vehicle in a turnable and undulating manner. Is described below. As shown in FIG. 1 to FIG. 3, 30 is a frame of an aerial work vehicle, and 31 is a jack that is attached to the frame 30 of the aerial work vehicle and that can be extended and retracted downward. In the case of the present embodiment, the jack 31 includes an outer box 31a having a base end attached to the frame 30, an inner box 31b that is telescopically inserted into the outer box 31a and protrudes and retracts from the distal end side of the outer box 31a, A hydraulic cylinder 31c (not shown) is disposed between the box 31a and the inner box 31b and drives the inner box 31b to extend and contract with respect to the outer box 31a.

  32 is a bracket fixed to the outer surface of the outer box 31a. Reference numeral 33 denotes a link having one end pivotally supported on the bracket 32 by a shaft 34. Reference numeral 35 denotes an arm that is pivotally supported by the other end of the link 33 and the shaft 36 and is pivotally supported by the tip of the inner box 31 b and the shaft 37. The arm 35 swings the arm 35 about the pivot shaft 36 by expanding and contracting the hydraulic cylinder 31 c of the jack 31.

  A roller 38 is disposed on the arm 35 so as to be rotatable about a shaft 39. Reference numeral 40 denotes a ground plate, which is disposed on the arm 35 so as to be swingable by a shaft 41. When the jack 31 is contracted, the roller 38 and the ground plate 40 are in a retracted state (the state shown in FIG. 1) in which the roller 38 and the ground plate 40 are retracted. The arm 35 is in a grounded state (state shown in FIG. 3) in which the grounding plate 40 is grounded instead of the roller 38 when the jack 31 is further extended. The positions of the roller 38 and the grounding plate 40 to be arranged in the above are determined.

  That is, when the arm 35 is swung about the shaft 36 by extending the jack 31, first, the rotating shaft 39 of the roller 38 is disposed below the arm 35 so that the roller 38 contacts the ground, and the jack 31 is further moved. By extending the arm 35, the arm 35 is further swung, and instead of the roller 38, the grounding plate 40 is grounded on the tip of the arm 35 farthest from the rocking shaft 36 of the arm 35 so as to contact the ground. Is arranged.

  In the roller grounding state, the rotary shaft 39 of the roller 38 is attached to the arm 35 so that the roller 38 is grounded to such an extent that the height working vehicle is supported together with the traveling wheels without lifting the height working vehicle by the roller 38. The position to be arranged is determined. Further, when the ground plate 40 is grounded by extension of the jack 31 in the ground plate ground state, the position where the swing shaft 41 of the ground plate 40 is disposed on the arm 35 so that the work vehicle at a high place can be lifted and fully supported by the ground plate 40. Is determined.

  In the present embodiment, the arm 35 is constituted by a triangular member, and the shaft 36, the shaft 39, and the shaft 41 are arranged at each vertex portion of the triangle, and the shaft 37 includes the shaft 36 and the shaft 41. It is arranged at a position near the axis 36 on the straight line connecting. The bracket 32, the link 33, and the arm 35 are arranged in a pair on the left and right sides with the inner box 31b interposed therebetween, and the shafts 34, 36, 37, 39, and 41 are arranged to penetrate left and right, and rollers 38 and the ground plate 40 are arranged between the left and right arms 35. Further, two support devices for an aerial work vehicle according to the present invention are arranged in the vicinity of the rear wheel.

The support device for an aerial work vehicle according to the present invention configured as described above operates as follows. In a traveling state of an aerial work vehicle, the hydraulic cylinder 31c of the jack 31 is reduced and the arm 35 is swung upward to bring the roller 38 and the ground plate 40 into the retracted state. (State of Fig. 1)
Next, when working while driving an aerial work vehicle, the worker who is on the work table works at a higher place while traveling the aerial work vehicle with traveling wheels. Therefore, in order to stably support the aerial work vehicle, the roller 38 is grounded to run the aerial work vehicle. Therefore, the hydraulic cylinder 31c of the jack 31 is extended to swing the arm 35. The hydraulic cylinder 31c is extended to swing the arm 35 until the roller 38 is grounded. When the roller 38 is grounded, the extension of the hydraulic cylinder 31c is stopped and the roller is grounded. (State of FIG. 2) By running the aerial work vehicle in this state, it is possible to perform the aerial work without being supported by the roller 38, and it is possible to work safely in a state of stable running support.

  In addition, when working at a predetermined position by an aerial work vehicle, the aerial work vehicle is fixedly and completely supported on the ground by the ground plate 40, and the worker who is on the work table performs the high work work. . Therefore, the hydraulic cylinder 31c of the jack 31 is further extended from the roller grounding state to swing the arm 35. The hydraulic cylinder 31c is extended to swing the arm 35 until the ground plate 40 is grounded. When the ground plate 40 is grounded, the extension of the hydraulic cylinder 31c is stopped to bring the ground plate into a grounded state. (State of FIG. 3) In this state, the work platform is moved to a high place to work at a high place, and since the work place is supported by the ground plate 40 on the ground, Supports safe and secure work at height.

  Conversely, in order to change the grounding plate grounding state or the roller grounding state to the retracted state, the roller 38 and the grounding plate 40 are brought into the retracting state by reducing the hydraulic cylinder 31c of the jack 31 and swinging the arm 35 upward. be able to.

  As described above, the support device for an aerial work vehicle according to the present invention can be brought into the retracted state, the roller grounding, and the grounding plate grounding state by driving the jack 31 to extend and retract, thereby eliminating troublesome operations. Can do.

  In the above embodiment, the positions of the roller 38 and the ground plate 40 arranged on the arm 35 are determined by arranging the shaft 37 near the shaft 36 on the straight line connecting the shaft 36 and the shaft 41. When the jack 31 is being contracted, the roller 38 and the ground plate 40 are retracted, and when the jack 31 is being extended, the roller 38 is grounded, and when the jack 31 is being extended, the roller 38 is being extended. Instead, it may be in a positional relationship such that the ground plate 40 is in a ground plate ground state in which the ground plate 40 is grounded. For example, the ground plate 40 may be disposed at a position near the shaft 41 on the straight line connecting the shaft 36 and the shaft 41. However, it is necessary to have an arrangement relationship in which the arm 35 can be stably supported by the link 33 and the jack 31 in the roller grounding state and the ground plate grounding state.

  Further, in the above embodiment, the link 33 is pivotally supported by the shaft 32 on the bracket 32 fixed to the outer side surface of the outer box 31 a of the jack 31, and is pivoted to the frame 30 via the outer box 31 a of the jack 31 and the bracket 32. Although supported, the frame 30 may be supported by the shaft 34 directly or via the bracket fixed to the frame 30 without using the outer box 31a or the bracket 32 of the jack 31. In this case, it is necessary to arrange the frame 30 close to the jack 31.

  Further, in the above embodiment, the jack 31 is constituted by the outer box 31a, the inner box 31b, and the hydraulic cylinder 31c. However, the hydraulic cylinder is directly attached between the frame 30 and the pivot shaft 37 of the arm 35. Also good. In this case, the link 33 is supported by the shaft 34 on the frame 30 directly or via a bracket.

  Next, in the description of the above-described embodiment, two support devices according to the present invention are arranged in the vicinity of the rear wheel, but four devices may be arranged on the left and right sides of the front part of the vehicle. . Moreover, although the case where the present invention was applied to an aerial work vehicle was described as an example in the above embodiment, it is needless to say that the present invention can also be applied to a work vehicle such as a bridge inspection vehicle and a crane vehicle. Furthermore, instead of the roller 38, an iron wheel may be disposed and applied as a rail vehicle.

It is explanatory drawing explaining the support apparatus of the working vehicle which concerns on this invention, and is explanatory drawing explaining a storing state. It is explanatory drawing explaining the support apparatus of the working vehicle which concerns on this invention, and is explanatory drawing explaining a roller grounding state. It is explanatory drawing explaining the support apparatus of the working vehicle which concerns on this invention, and is explanatory drawing explaining a ground-plate grounding state. It is explanatory drawing explaining the conventional support apparatus of a working vehicle, (a) is explanatory drawing explaining a board grounding position, (b) is explanatory drawing explaining a retracted position.

Explanation of symbols

30 Frame 31 Jack 33 Link 35 Arm 38 Roller 40 Ground plate

Claims (1)

A jack that is attached to the vehicle's frame and that can be driven to extend and retract its tip part downward, a link that is pivotally supported by a frame that is close to the jack, and the other end of the link and the jack tip part are individually pivotally supported. An arm that is connected and swings about a pivot shaft with respect to the link by expansion and contraction of the link, a rotatable roller and a swingable grounding plate are arranged on the arm, and when the jack is being reduced, the arm is in contact with the roller. In the retracted state in which the ground plate is retracted, the roller is grounded while the jack is being extended, and the ground plate is grounded instead of the roller when the jack is further extended. A work vehicle support device characterized in that the positions of a roller and a ground plate arranged on the arm are determined.

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