JP2004330946A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle capable of increasing an elevating amount and widening view without heightening a height position of a cab at a lowest position. <P>SOLUTION: The working vehicle is provided with a swinging arm 12 connecting a vehicle body 1 and a cab 2, an intermediate link 13 with an intermediate part pivotally connected to the connection part between the vehicle body 1 and the cab 2 in the swinging arm 12, a lower link 15 with the front end part 15a pivotally connected to the lower end 13b of the intermediate link 13 and a base end part 15b pivotally connected to the vehicle body 1 side, and an upper link 17 with a base end part 17b pivotally connected to the upper end part 13a of the intermediate link 13 and the front end part 17a pivotally connected to the cab 2 side. The swinging arm 12 is swung having a pivotally connecting part 21 on the body side as a center by the operation of an elevating cylinder 11, thereby elevating the cab 2 while maintaining a horizontal state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle capable of raising and lowering a cab so that an operator can check a work situation when loading a load on a truck or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a lifting / lowering mechanism of a work vehicle capable of raising / lowering a cab, there has been a mechanism using a parallel link mechanism (for example, see Patent Document 1). As shown in FIGS. 8 and 9, a work vehicle provided with such a parallel link mechanism includes a lower traveling body 51 and an upper revolving body (vehicle body) supported by the lower traveling body 51 via a revolving mechanism 52. ) 53, and a cab 55 is supported by the upper swing body 53 via a parallel link mechanism 54. In addition, the one described in Patent Document 1 includes a link mechanism for moving the cab 55 in the front-rear direction in addition to the parallel link mechanism 54 for elevating and lowering. It is omitted in FIGS. 8 and 9.
[0003]
The parallel link mechanism 54 includes an upper link 56 and a lower link 57 interposed between the upper swing body 53 and the cab 55. In this case, a support column 58 is erected on the upper revolving structure 53, and a support piece 59 is provided on the cab 55. The upper link 56 and the lower link 57 are pivotally connected to the support column 58 and the support piece 59. I have. The lifting cylinder 60 is interposed between the support column 58 and the support piece 59 below the lower link 57. That is, in the elevating cylinder 60, the base end of the cylinder body 61 is pivotally connected to the column 58, and the distal end of the piston rod 62 is pivotally connected to the support piece 59.
[0004]
[Patent Document 1]
JP-A-2000-335449 (page 2, FIG. 1)
[0005]
[Problems to be solved by the invention]
As shown in FIG. 8, when the piston rod 62 of the elevating cylinder 60 is contracted, the cab 55 is in a lowered state. When the piston rod 62 of the elevating cylinder 60 is extended from this state, as shown in FIG. Thus, the cab 55 rises while maintaining the horizontal state. That is, the upper link 56 and the lower link 57 swing about the base pivot portions 56b and 57b, respectively, and the cab 55 moves up and down.
[0006]
For this reason, the lift amount of the cab 55 is determined by the swing range of the upper link 56 and the lower link 57. That is, the state where the piston rod 62 of the lifting cylinder 60 is most contracted is the lowest position of the cab 55, and the state where the piston rod 62 of the lifting cylinder 60 is most expanded is the highest position of the cab 55. At this time, the position of the tip pivot 57a of the lower link 57 in the lowermost state of the cab 55 is set to the position shown by the solid line in FIG. 10, and if the cab 55 rises to the highest position from this state, the lower link 57 Is located at a position indicated by a virtual line in FIG. Therefore, the vertical direction difference (H) of the tip pivot 57a is the amount of elevation, and the amount of elevation cannot be made very large. For this reason, when loading luggage on a truck or the like using this work vehicle, the rising amount of the cab 55 is small, and as shown in FIG. 9, the lower limit line L of the operator's field of view becomes the position indicated by the two-dot chain line, The entire bottom surface 65 inside the truck bed 64 could not be seen, resulting in poor workability (loading work of the load).
[0007]
By the way, even if the amount of lifting and lowering is small, the cab height at the top can be increased by increasing the cab height at the bottom, thereby widening the operator's field of view and improving the workability. It is possible to plan. However, there is a height restriction during traveling or the like, and the height at the lowest position cannot be made too high due to this restriction. For this reason, it was not possible to obtain a sufficient field of view.
[0008]
The present invention has been made in order to solve the above-mentioned conventional drawbacks, and an object of the present invention is to increase a vertical movement amount without increasing a height position at a lowermost position of a cab, thereby increasing a field of view. It is to provide a work vehicle which can be taken.
[0009]
Means and effects for solving the problem
Therefore, a work vehicle according to claim 1 is a work vehicle including a vehicle body 1, a cab 2, and an elevating mechanism 3 that supports the cab 2 so that the cab 2 can be moved up and down. An oscillating arm 12 connecting the vehicle body 1 and the cab 2, an intermediate link 13 in which an intermediate portion 13 c is pivotally connected between the connecting portion of the oscillating arm 12 and the vehicle body 1 and the cab 2, The distal end 15a is pivotally connected to the lower end 13b of the intermediate link 13, and the base end 15b is pivotally connected to the vehicle main body 1 below the main body side connection portion 21 of the swing arm 12. The lower link 15 and the base end 17b thereof are pivotally connected to the upper end 13a of the intermediate link 13 and the distal end thereof is located on the cab 2 side above the cab-side pivoted portion 22 of the swing arm 12. Side 17a pivots The swing arm 12 swings around the body-side pivotal connection portion 21 by the operation of the lifting / lowering cylinder 11, and the upper link 17, the swing arm 12, and the lower link 15 are provided. The cab 2 moves up and down while maintaining a horizontal state while maintaining a parallel state.
[0010]
In the work vehicle according to the first aspect, when the cab 2 moves up and down, the amount of up and down movement is determined by the swing range of the swing arm 12. That is, if the piston rod 31 of the lifting cylinder 11 is located at the lowest position of the cab 2 in a state in which the piston rod 31 of the lifting cylinder 11 is most contracted, and the piston rod 31 of the lifting cylinder 11 extends from this state, the swing arm 12 is moved to the main body side The cab 2 is positioned at the highest position while swinging about the pivotal connection portion 21 and the piston rod 31 is extended most. At this time, by having the lower link 15, the upper link 17, and the intermediate link 13, the cab 2 is raised while maintaining the horizontal state. Further, when the piston rod 31 is contracted from the state where the cab 2 is located at the uppermost position, the swing arm 12 swings around its body-side pivoting portion (proximal pivoting portion) 21 so that the cab 2 moves. 2 descends while maintaining a horizontal state. Then, the cab 2 returns to the lowest position with the piston rod 31 contracted most.
[0011]
In this case, the position of the tip pivot portion (cab-side pivot portion) 22 of the swing arm 12 in the lowest state of the cab 2 is set to the position shown by the solid line in FIG. In the higher rank, the position of the cab-side pivot 22 of the swing arm 12 is the position indicated by the phantom line in FIG. The vertical difference between the cab-side pivot portions 22 is the vertical movement amount H. At this time, in comparison with FIG. 10 showing the conventional parallel link mechanism 54, in the work vehicle according to the first aspect, the swing center (the main body side pivoting portion 21 of the swing arm 12) is The position of the base end pivoting portion 56b can be used, and the swinging distal end portion (the cab-side pivoting portion 22 of the swinging arm 12) can be the distal end pivoting portion 57a of the conventional lower link 57. For this reason, in the work vehicle according to the first aspect, the swing radius (the length of the swing arm 12) is adjusted by the distal link portion 56a and the proximal link portion 56b of the upper link 56 in FIG. And a diagonal line (a line connecting the distal pivot portion 57a of the lower link 57 and the proximal pivot portion 56b of the upper link 56) composed of the distal pivot portion 57a and the proximal pivot portion 57b. Can be bigger.
[0012]
By increasing the swing radius in this way, the amount of elevation H can be increased. For this reason, the height position at the top of the cab 2 can be set to a high position, and the operator in the cab 2 can work from a high position, and the field of view is enlarged, and the operability is improved. Can be. Further, since it is not necessary to set the height position at the lowest position of the cab 2 to a higher position, there is no height restriction during traveling or the like. In addition, the lower link 15 has its distal end 15 a pivotally connected to the lower end 13 b of the intermediate link 13, and has its base connected to the vehicle main body 1 below the main body side connection portion 21 of the swing arm 12. The end side 15b is pivotally connected, and the upper link 17 has its base end side 17b pivotally connected to the upper end side 13a of the intermediate link 13 and the upper link 17 is above the cab side pivot connection portion 22 of the swing arm 12. Since the tip side 17a is pivotally connected to the cab 2, the length of the elevating mechanism 3 in the front-rear direction can be suppressed from increasing. As described above, even when the cab 2 is not raised, the entire vehicle is not increased in size by the lifting mechanism 3 even if the lifting mechanism 3 is provided on the work vehicle, and the work vehicle is maintained at the same size as the conventional one. Can be.
[0013]
The work vehicle according to claim 2 is characterized in that the lifting cylinder 11 is interposed between the vehicle body 1 and the cab 2.
[0014]
In the working vehicle according to the second aspect, the lifting cylinder 11 is interposed between the vehicle body 1 and the cab 2, so that the swing arm 12 can swing reliably. The vertical movement of the cab 4 due to the driving of the cylinder 11 is stabilized. Further, the lifting cylinder 11 can be effectively arranged in the space between the vehicle body 1 and the cab 2, and the work vehicle can be prevented from being enlarged due to the arrangement of the lifting cylinder 11.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, specific embodiments of the work vehicle according to the present invention will be described in detail with reference to the drawings. FIGS. 1 to 3 are overall side views of a work vehicle according to the present invention. The work vehicle includes a vehicle body 1, a cab 2, and an elevating mechanism 3 that supports the cab 2 on the vehicle body 1 so that the cab 2 can be raised and lowered. Is provided. That is, the work vehicle includes a lower traveling body 5 having wheels 4, an upper revolving body 7 supported by the lower traveling body 5 via a revolving mechanism 6, and the upper revolving body 7 via a lifting mechanism 3. The cab 2 is supported and can be moved up and down. In this case, the upper-part turning body 7 is referred to as the vehicle body 1. Note that the lower traveling body 5 is provided with an outrigger 8 that is in contact with the ground E during work other than during traveling.
[0016]
The lifting mechanism 3 includes a link structure 10 and a lifting / lowering cylinder (hydraulic cylinder) 11. As shown in FIG. 4, the link structure 10 has a pair of swing arms 12, 12 and central portions (intermediate portions) 12 c, 12 c of the swing arms 12, 12 having intermediate portions 13 c, 13 c pivotally connected thereto. Intermediate links 13, lower links 15, 15 whose distal ends 15 a, 15 a are pivotally connected to lower ends 13 b, 13 b of the intermediate links 13, 13, and upper ends 13 a, 13 a of the intermediate links 13, 13. And upper links 17, 17 to which the base ends 17b, 17b are pivotally connected.
[0017]
In this case, as shown in FIG. 1 and the like, columns 18, 18 are erected on the upper swing body 7, and support pieces 20, 20 are attached to a substrate 19 of the cab 2. The bases 12b, 12b of the swing arms 12, 12 are pivotally connected to the upper ends 18a, 18a of the columns 18, 18, and the swing arms are connected to the lower ends 20b, 20b of the support pieces 20, 20. The distal ends 12a, 12a of 12, 12 are pivotally connected. Further, the base ends 15b, 15b of the lower links 15, 15 are pivotally connected to the intermediate height positions of the columns 18, 18, and the distal ends 17a, 17a of the upper links 17, 17 are connected to the upper ends 20a of the support pieces 20, 20. , 20a. That is, the base end portions 15b, 15b of the lower links 15, 15 are pivotally connected to the vehicle main body 1 below the main body side connection portions 21, 21 of the swing arms 12, 12, and the distal ends of the upper links 17, 17 are provided. The portions 17a, 17a are pivotally connected to the cab 2 side above the cab-side pivot portions 22, 22 of the swing arms 12, 12.
[0018]
As described above, since the swing arm 12, the intermediate link 13, the lower link 15, and the upper link 17 each have a pair, they are connected by a plurality of connection bars 23a. That is, the upper links 17, 17 have their distal ends 17a, 17a connected by the first connecting bar 23a, and their proximal ends 17b, 17b connected by the third connecting bar 23c. The intermediate links 13, 13 have their upper ends 13a, 13a connected by the third connecting bar 23c, and their lower ends 13b, 13b connected by a fourth connecting bar 23d. The swing arms 12, 12 have their distal ends 12a, 12a connected by a second connection bar 23b, and their base ends 12b, 12b connected by a fifth connection bar 23e. The lower links 15, 15 have their distal ends 15a, 15a connected by a fourth connecting bar 23d, and their proximal ends 15b, 15b connected by a sixth connecting bar 23f.
[0019]
At this time, the pivot 24 between the swing arm 12 and the intermediate link 13 is on a straight line A1 connecting the body-side pivot 21 and the cab-side pivot 22 of the pivot arm 12, as shown in FIG. And the center line A2 of the lower link 15 and the center line A3 of the upper link 17 are arranged in parallel to the straight line A1. The swing arm 12 has the same dimension between the body-side pivot portion 21 and the pivot portion 24 and the dimension between the cab-side pivot portion 22 and the pivot portion 24. 15 and the dimension between the pivoting portion 24 of the swing arm 12 and the main body-side pivoting portion 21 are equal to each other. The dimension between the distal pivot 27 and the proximal pivot 28 of the link 17 and the dimension between the cab-side pivot 22 and the pivot 24 are the same.
[0020]
Next, the lifting cylinder 11 is provided between the vehicle body 1 and the cab 2, and is provided in a pair. That is, as shown in FIG. 1 and the like, each of the lifting cylinders 11, 11 has a base end portion of the cylinder body 30, 30 pivotally connected to the column 18, 18, and a distal end portion of the piston rod 31, 31. Are pivotally connected to the support pieces 20, 20. In this case, the pivot portion 32 of the cylinder body 30 is provided near the proximal pivot portion 26 of the lower link 15 (specifically, slightly above the proximal pivot portion 26). The pivot portion 33 is provided near the cab-side pivot portion 22 of the swing arm 12 (specifically, slightly below the cab-side pivot portion 22).
[0021]
For this reason, in a state where the piston rods 31, 31 of the elevating cylinders 11, 11 are in the most contracted state, as shown in FIG. 2 is at the bottom. This state is a state such as when the work vehicle is traveling, and is a cab stowed state. When the piston rods 31, 31 of the lifting cylinders 11, 11 extend from this state, the swing arms 12, 12 move around the body-side pivoting portion 21 in the direction of arrow B as shown in FIG. Will swing. At this time, the cab 2 is raised while maintaining its horizontal state by the link mechanism constituted by the upper link 17, the intermediate link 13, and the lower link 15. That is, while the upper link 17, the swing arm 12, and the lower link 15 are maintained in a parallel state, and the intermediate link 13 is disposed along the up-down direction, the swing arm 12 is connected to its main body-side pivoting portion 21. Rocking around.
[0022]
Then, the piston rods 31, 31 of the elevating cylinders 11, 11 further extend from the state shown in FIG. 1, and the swing arm 12 further swings around the body side pivotal connection portion 21 in the arrow B direction. If it becomes the most extended state, it will be in the state shown in FIG. When the piston rods 31, 31 of the elevating cylinders 11, 11 are contracted from the state shown in FIG. 3, the swing arm 12 swings in the direction of arrow C about the main body side pivotal connection portion 21. Thus, the cab 2 descends sequentially while maintaining the horizontal state. When the piston rods 31, 31 of the lifting cylinders 11, 11 return to the most contracted state, the state returns to the cab storage state in FIG.
[0023]
Next, the elevation amount of the elevation mechanism 3 will be described with reference to FIG. That is, the position of the tip pivot portion (cab-side pivot portion) 22 of the swing arm 12 in the lowest position of the cab 2 is set to the position shown by the solid line in FIG. Then, the position of the tip pivot 22 of the swing arm 12 becomes the position indicated by the phantom line in FIG. The vertical difference of the tip pivot portion 22 is the vertical movement amount H. At this time, in comparison with FIG. 10 showing the conventional parallel link mechanism 54, in the work vehicle provided with the elevating mechanism 3 shown in FIG. 6, the swing center (the main body side pivotal connection portion 21 of the swing arm 12) is located at the center. The position of the base pivot portion 56b of the conventional upper link 56 can be set as the position of the pivot end (the distal end pivot portion 22 of the swing arm 12) as the distal end pivot portion 57a of the conventional lower link 57. . For this reason, in the elevating mechanism 3 shown in FIG. 6, the swing radius (the length of the swing arm 12) is set to the distal pivot portion 56a and the proximal pivot portion 56b of the upper link 56 in FIG. A diagonal line of a parallelogram (a line connecting the distal pivot 57a of the lower link 57 and the proximal pivot 56b of the upper link 56) composed of the distal pivot 57a and the proximal pivot 57b can do. As a result, the swing radius increases, and the amount H of raising and lowering the cab 2 increases.
[0024]
As described above, according to the work vehicle, the amount of lifting and lowering of the cab 2 can be increased, and the highest position of the cab 2 can be set to a high position. Thereby, the operator in the cab can work from a high position, the field of view can be expanded, and the workability can be improved. That is, as shown in FIG. 5, when the work of loading the cargo on the truck 35 is performed by this work vehicle, the solid line is moved to a height position at which the bottom surface 37 inside the carrier 36 of the truck 35 can be effectively confirmed. The cab 2 can be raised as shown by. As a result, the lower limit line L1 of the operator's field of view is at the position indicated by the two-dot chain line, and the field of view is enlarged, and workability can be improved. On the other hand, in the conventional device, the lower limit line L2 of the operator's field of view is the position indicated by the two-dot chain line in the height position indicated by the imaginary line in FIG. Obstructed, the field of view was narrow, and workability was poor.
[0025]
In addition, since the lowest position of the cab 2 can be made higher without setting the lowermost position of the cab 2 to a higher position, the cab height position when the cab is stored does not become higher. There is no height restriction when traveling. Moreover, the lower link 15 has its distal end 15 a pivotally connected to the lower end 13 b of the intermediate link 13, and has its base end 15 b connected to the vehicle main body 1 below the main body side pivotal connection 21 of the swing arm 12. The upper link 17 has its base end 17b pivotally connected to the upper end 13a of the intermediate link 13, and its upper end connected to the cab 2 above the cab-side pivotal connection 22 of the swing arm 12. Since the portion 17a is pivotally connected, it is possible to prevent the length of the elevating mechanism 3 from increasing in the front-rear direction. As described above, when the cab 2 is not moved up (when the cab is stored), even if the work vehicle is provided with the elevating mechanism 3, the elevating mechanism 3 does not increase the size of the entire vehicle, and is the same size as the conventional one. Can be maintained.
[0026]
Further, since the elevating cylinder 11 is interposed between the vehicle body 1 and the cab 2, the swing arm 12 can be surely swung, and the cab 4 driven by the elevating cylinder 11 is driven. Stabilization Further, the lifting cylinder 11 can be effectively arranged in the space between the vehicle body 1 and the cab 2, and the work vehicle can be prevented from being enlarged due to the arrangement of the lifting cylinder 11. The cab 2 can be stopped at an arbitrary height position in the elevating range by changing the amount of protrusion of the piston rod 31 of the elevating cylinder 11, and the height of the cab 2 can be adjusted according to the type of work or the like. Can be adjusted.
[0027]
FIG. 7 shows another link structure 10 of the lifting mechanism 3, in which a single box-shaped frame is used as the swing arm 12. That is, one support 40 is erected on the vehicle body 1 side, and the base end 12b of the swing arm 12 is inserted between a pair of support pieces 41 at the upper end of the support 40, and the support 41 , 41, and the distal end 12a of the swing arm 12 is inserted between the support pieces 20, 20 (see FIG. 4 and the like) of the cab 2. The tip 12a is pivoted. Then, intermediate portions 13c, 13c of the intermediate links 13, 13 are pivotally connected to both side surfaces of the swing arm 12, respectively, and upper links 17, 17 and lower links 15, 15 are respectively connected to the intermediate links 13, 13. Connect. At this time, the lower link 15, 15 has its distal end 15a, 15a pivotally connected to the lower end 13b, 13b of the intermediate link 13, 13, and its proximal end 15b, 15b pivotally connected to the support 40. The upper link 17, 17 has a distal end 17a, 17a pivotally connected to the support piece 20, 20, and a proximal end 17b, 17b pivotally connected to the upper end 13a, 13a of the intermediate link 13, 13. Is tied.
[0028]
Therefore, even if the link structure 10 shown in FIG. 7 is used, the same function as that of the link structure 10 shown in FIG. 4 can be exhibited. That is, although not shown in FIG. 7, if the lifting / lowering cylinder 11 provided between the vehicle body 1 and the cab 2 is driven, the swing arm 12 is pivotally connected to the body side. The cab 2 can swing about the portion 21, and with this swing, the cab 2 is held in a horizontal state by the link mechanism constituted by the upper link 17, the intermediate link 13, and the lower link 15, and the cab 2 moves up and down. can do. Moreover, even in this case, similarly to the case shown in FIG. 4, the amount of elevation of the cab 2 can be increased, and the height position at the highest position of the cab 2 can be set to a high position.
[0029]
Although the specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be implemented with various modifications within the scope of the present invention. For example, in the above embodiment, a pair of the lifting cylinders 11 of the lifting mechanism 3 is used, but one may be used. Further, as the elevating cylinder 11, the cylinder body 30 may be connected to the cab 2 side, and the piston rod 31 may be connected to the main body 1 side. Further, in the above embodiment, the lifting cylinder 11 is connected to the column 18 (or column 40) on the main body 1 side and the support piece 20 on the cab 2 side, but is directly connected to the vehicle body main body 1 and the cab 2. Even when the cab 2 (or the supporting pieces 20 on the cab 2) and the swing arm 12 are connected to the cab 2 (or the support pieces 20 on the cab 2 side), Is also good. Further, in the swing arm 12, even if the dimension between the body-side pivot portion 21 and the pivot portion 24 and the dimension between the cab-side pivot portion 22 and the pivot portion 24 are not the same. Good. That is, the intermediate portion 13c of the intermediate link 13 only needs to be pivotally connected between the connecting portions of the swing arm 12 between the vehicle body 1 and the cab 2, and the above-described pivot connection portion 24 may be provided near the vehicle body 1. Alternatively, it may be provided near the cab 2. In the above-described embodiment of the work vehicle of the present invention, a wheel-type traveling body is used, but a crawler-type traveling body may be used.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a work vehicle according to the present invention.
FIG. 2 is a side view showing the cab stored state of the work vehicle.
FIG. 3 is a side view showing a state where a cab of the work vehicle is raised to an uppermost position.
FIG. 4 is a perspective view of a link structure of a lifting mechanism of the work vehicle.
FIG. 5 is an explanatory diagram of a work state by the work vehicle.
FIG. 6 is a simplified diagram for explaining the amount of elevation of the cab of the work vehicle.
FIG. 7 is a perspective view of another link structure of the lifting mechanism of the work vehicle.
FIG. 8 is a side view of a conventional working vehicle in a cab stowed state.
FIG. 9 is a side view showing a state in which a cab of a conventional work vehicle is raised to the highest position.
FIG. 10 is a simplified diagram for explaining a vertical movement amount of a conventional work vehicle cab.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle main body 2 Cab 3 Elevating mechanism 11 Elevating cylinder 12 Swing arm 13 Intermediate link 13a Upper end 13b Lower end 13c Intermediate part 15 Lower link 15a Tip 15b Base end 17 Upper link 17a Tip 17b Base end 21 Main body Side connection 22 Cab side connection

Claims (2)

A working vehicle comprising a vehicle body, a cab, and an elevating mechanism that supports the cab so as to be able to elevate and lower the cab, wherein the elevating mechanism includes a swing arm that connects the vehicle body and the cab, An intermediate link whose portion is pivotally connected between the connecting portion of the swing arm and the vehicle body and the cab; a distal end of the intermediate link is pivotally connected to a lower end side of the intermediate link; A lower link whose base end is pivotally connected to the vehicle body below the connection portion; and a base end whose base end is pivotally connected to the upper end of the intermediate link, and a cab-side pivot connection portion of the swing arm. An upper link whose tip is pivotally connected to the cab side above the cab side, and the operation of the lifting cylinder causes the swing arm to swing about the body-side pivoted portion, and And swing arm and lower link A work vehicle, characterized in that the cab is raised and lowered to hold the horizontal position while maintaining the parallel state. The work vehicle according to claim 1, wherein the lifting cylinder is interposed between the vehicle body and the cab.

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