JP2008146265A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle which allows a driver to smoothly perform the operation of stepping on the front end and rear end of a pedal for operation by a foot. <P>SOLUTION: The working vehicle is provided with: a cylinder device for driving a working device; a pedal 61 for operation to operate the cylinder device; and a driver's seat. The pedal 61 for operation is formed so as to be freely rockable back and forth with a support shaft 29 as a support point, and energized so as to be returned to a neutral position N. When the pedal 61 for operation is rocked from the neutral position N to backward and forward directions, the piston rod of the cylinder device is configured to advance and retreat. A tiptoe tread 43 on which the tiptoe portion of the foot is placed is formed at the front of the pedal 61 for operation, and a heel tread 45 on which the heel of the foot is placed is formed at the rear of the pedal 61 for operation. The heel tread 45 is not formed on the extension of the tiptoe tread 43 but inclined by only predetermined angle C upward with respect to the tiptoe tread 43. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a working vehicle such as a skid steer loader.

  Conventionally, as this type of work vehicle, there is a skid steer loader 10 as shown in FIGS. 10 and 11, for example. The vehicle body 11 of the skid steer loader 10 is supported by a pair of left and right front wheels 12 and a rear wheel 13. The vehicle body 11 includes a working device 14, a pair of left and right hydraulic boom and bucket cylinder devices 15 and 16 (an example of an operating device) that drives the working device 14, and boom and bucket cylinder devices 15 and 16. There are provided boom operation and bucket operation pedals 17 and 18 for operating the cab and a cab 19.

  The work device 14 includes a pair of left and right L-shaped booms 21 and a bucket 22 of a work attachment provided between the free end portions of both booms 21. The base ends of both the booms 21 are provided in a pair of left and right brackets 23 erected at the rear part of the vehicle body 11 so as to be rotatable about a support pin 24 inserted in the left and right direction. The bucket 22 is connected to the boom 21 so as to be rotatable about a support pin 25 inserted in the left-right direction.

  The boom cylinder device 15 rotates both the booms 21 in the vertical direction, and the main body 15a of both the boom cylinder devices 15 is connected to the vehicle body 11 so as to be retractable (that is, operable in two directions). The tip of 15 b is connected to the boom 21. Further, the bucket cylinder device 16 rotates the bucket 22, and the main body 16a of both the bucket cylinder devices 16 is connected to the boom 21, so that the piston rod 16b can be retracted (that is, operated in two directions). The tip is connected to the bucket 22.

  A driver seat 27 is provided in the driver's cab 19, and operating levers 28 for driving are provided on both sides of the driver seat 27. As shown in FIGS. 11 to 13, the boom operation and bucket operation pedals 17 and 18 are provided so as to be swingable back and forth via a support shaft 29 in the left-right direction, and a return spring (not shown). ) To return to the neutral position N. Each of the operation pedals 17 and 18 is inclined at a predetermined inclination angle A with respect to the floor 31 (horizontal plane) in the cab 19 at the neutral position N (see FIG. 13).

  The support shaft 29 is inserted through cylindrical bosses 32 provided at the front and rear intermediate portions of the operation pedals 17 and 18, and both left and right end portions of the support shaft 29 are held by pillow units 30. Both the pillow units 30 are provided on the floor 31.

  In addition, the vehicle body 11 is provided with a control valve 33 that switches the piston rods 15b and 16a of the cylinder devices 15 and 16 to be withdrawn and fixed. The control valve 33 has a boom cylinder switching spool 39 and a bucket cylinder switching spool 40.

  By the movement of the boom cylinder switching spool 39 in the axial direction, the piston rod 15b of the boom cylinder device 15 is switched between being withdrawn and fixed. The boom cylinder switching spool 39 is interlocked and connected to the boom operation pedal 17 via the boom interlocking connection mechanism 35. The boom interlocking connection mechanism 35 includes a connecting plate 37 provided at one end on the boss 32 of the boom operation pedal 17 and a link 38 connected at one end to the boom cylinder switching spool 39.

  Similarly, with the movement of the bucket cylinder switching spool 40 in the axial direction, the piston rod 16b of the bucket cylinder device 16 is switched between being withdrawn and fixed. The bucket cylinder switching spool 40 is interlocked and connected to the bucket operation pedal 18 via the bucket interlocking coupling mechanism 36. The bucket interlocking connection mechanism 36 includes a connecting plate 37 provided at one end on the boss 32 of the bucket operation pedal 18 and a link 38 connected at one end to the bucket cylinder switching spool 40. The other end of each connecting plate 37 of the boom and bucket interlocking connecting mechanisms 35 and 36 and the other end of each link 38 are connected via a connecting pin 34.

  As shown in FIG. 13, when the boom operation pedal 17 swings from the neutral position N (see solid line) to the front F (see virtual line) with the support shaft 29 as a fulcrum, the boom cylinder switching spool 39 of the control valve 33 is used. Moves to one side, and the piston rod 15b of the boom cylinder device 15 retracts (that is, operates in one direction). When the boom operation pedal 17 swings from the neutral position N to the rear R (see the phantom line), the boom cylinder switching spool 39 moves to the other side, and the piston rod 15b protrudes (that is, operates to the other side). ) Further, when the boom operation pedal 17 is in the neutral position N (see the solid line), the boom cylinder switching spool 39 returns to the neutral position, and the piston rod 15b is fixed.

  Similarly, when the bucket operation pedal 18 swings from the neutral position N to the front F with the support shaft 29 as a fulcrum, the bucket cylinder switching spool 40 of the control valve 33 moves to one side, and the bucket cylinder device 16 The piston rod 16b protrudes (that is, operates in one direction). Further, when the bucket operation pedal 18 swings from the neutral position N to the rear R, the bucket cylinder switching spool 40 moves to the other, and the piston rod 16b retracts (that is, operates to the other). Further, when the bucket operation pedal 18 is in the neutral position N, the bucket cylinder switching spool 40 returns to the neutral position, and the piston rod 16b is fixed.

  As shown in FIG. 12, each pedal 17, 18 is formed with a toe tread surface 43 for placing the toe portion 42 of the foot 41 and a tread surface 45 for placing the heel portion 44 of the foot 41. The heel tread surface 45 is on an extension of the toe tread surface 43 (that is, the toe tread surface 43 and the heel tread surface 45 are on the same plane 49).

Hereinafter, the operation of the above configuration will be described.
When the operator 48 sits on the driver's seat 27 and rotates the boom 21 downward, the left foot 41 is placed on the boom operation pedal 17 with the knee bent as shown in FIG. Depress the front part of the boom operation pedal 17. As a result, the boom operation pedal 17 swings from the neutral position N to the front F with the support shaft 29 as a fulcrum, and the boom cylinder switching spool 39 moves to one side, as shown by the phantom line in FIG. The piston rod 15b of the cylinder device 15 is retracted, and the boom 21 is rotated downward.

  Further, when the boom 21 is rotated upward, the rear portion of the boom operation pedal 17 is depressed with the heel portion 44 of the left foot 41. As a result, the boom operation pedal 17 swings from the neutral position N to the rear R with the support shaft 29 as a fulcrum, and the boom cylinder switching spool 39 moves to the other side, as shown by the solid line in FIG. The piston rod 15b of the cylinder device 15 protrudes, and the boom 21 rotates upward.

  Further, by releasing the left foot 41 from the boom operation pedal 17, no pedal force is applied to the boom operation pedal 17, the boom operation pedal 17 returns to the neutral position N by the urging force of the return spring, and the boom cylinder is switched. The spool 39 returns to the neutral position.

  Similarly, when the bucket 22 is tilted forward, the right foot 41 is placed on the bucket operation pedal 18, and the front portion of the bucket operation pedal 18 is depressed by the toe portion 42 of the right foot 41. As a result, the bucket operating pedal 18 swings from the neutral position N to the front F with the support shaft 29 as a fulcrum, and the bucket cylinder switching spool 40 moves to one side, as shown by the solid line in FIG. The piston rod 16b of the cylinder device 16 protrudes, and the bucket 22 rotates downward and tilts forward.

  Further, when the bucket 22 is tilted backward, the rear portion of the bucket operation pedal 18 is depressed by the heel portion 44 of the right foot 41. As a result, the bucket operating pedal 18 swings from the neutral position N to the rear R with the support shaft 29 as a fulcrum, and the bucket cylinder switching spool 40 moves to the other side, as shown by the phantom line in FIG. The piston rod 16b of the cylinder device 16 is retracted, and the bucket 22 rotates upward and tilts backward.

  Further, by releasing the right foot 41 from the bucket operation pedal 18, no pedaling force is applied to the bucket operation pedal 18, and the bucket operation pedal 18 returns to the neutral position N by the urging force of the return spring, and the bucket cylinder is switched. The spool 40 returns to the neutral position.

The skid steer loader 10 including the boom operation pedal 17 and the bucket operation pedal 18 as described above is described in, for example, Patent Document 1 below.
JP-A-8-99582

  However, in the above conventional type, as shown in FIG. 13, the point at which the toe portion 42 contacts the boom operation pedal 17 is defined as the front contact point Pa, and the point at which the collar portion 44 contacts the boom operation pedal 17. As shown in FIG. 12, the toe tread surface 43 and the foot tread surface 45 of each pedal 17, 18 are on the same plane 49 as shown in FIG. 12, for example, as shown in FIG. When the worker 48 sits on the driver's seat 27 and places the left foot 41 on the boom operation pedal 17 at the neutral position N, the height of the rear contact point Pb with respect to the front contact point Pa is lowered. The angle α between the shin 46 and the upper 47 of the left foot 41 becomes small, and there is a problem that it becomes difficult to perform the operation of stepping down the rear portion of the boom operation pedal 17 with the heel portion 44.

  Similarly, when the operator 48 sits on the driver's seat 27 and places the right foot 41 on the bucket operation pedal 18 at the neutral position N, the angle α between the shin 46 and the upper 47 of the right foot 41 is reduced. There is a problem that it becomes difficult to perform an operation of stepping down the rear portion of the bucket operation pedal 18 at the hook portion 44.

  As a countermeasure against the above problem, the shin when the inclination angle A (see FIG. 13) of the operation pedals 17 and 18 at the neutral position N is reduced and the foot 41 is placed on the pedals 17 and 18 at the neutral position N. It is conceivable to enlarge the angle α between 46 and A47. However, in this case, the height of the rear contact point Pb at the neutral position N increases, but the height of the front contact point Pa decreases. There is a problem that the angle α when the step is depressed downward increases and the operation becomes difficult.

  An object of the present invention is to provide a working vehicle capable of smoothly performing an operation when the front and rear portions of an operation pedal are stepped on with a foot.

In order to achieve the above object, according to the first aspect of the present invention, a vehicle body is provided with a work device, an operation device that operates in two directions to drive the work device, an operation pedal that operates the operation device, and a driver seat. And
The operation pedal is provided so as to be swingable back and forth via a support shaft, and is urged so as to return to the neutral position.
When the operating pedal swings forward from the neutral position with the support shaft as a fulcrum, the actuator operates in one direction,
When the operating pedal swings backward from the neutral position with the support shaft as a fulcrum, the working vehicle is configured to operate to the other,
On the front part of the operation pedal, a toe tread surface for placing the toe part of the foot is formed,
On the back of the operation pedal, a tread surface for placing the heel part of the foot is formed,
The saddle tread is not an extension of the toe tread, but is inclined upward with respect to the toe tread.

  According to this, the operator sits on the driver's seat and puts his feet on the operation pedal in the neutral position with the knee bent. At this time, the toe portion of the foot is placed on the toe tread surface of the operation pedal, and the heel portion is placed on the tread surface of the operation pedal.

  When the front part of the operation pedal is stepped on at the toe portion of the foot, the operation pedal swings forward from the neutral position with the support shaft as a fulcrum, and the operating device operates in one direction. Further, when the rear portion of the operation pedal is depressed with the heel portion of the foot, the operation pedal swings backward from the neutral position with the support shaft as a fulcrum, and the operating device operates to the other.

  At this time, if the point where the toe portion of the foot contacts the operation pedal is a front contact point, and the point where the heel portion contacts the operation pedal is a rear contact point, the tread surface of the operation pedal is When the operator sits on the driver's seat and places his / her foot on the operation pedal in the neutral position because it is inclined upward with respect to the toe tread, not on the extension of the tread, the rear of the front abutment point The height of the contact point is higher than before. As a result, the angle between the shin of the foot and the instep is larger than before, and the operation of stepping down the rear portion of the operation pedal at the heel portion can be performed smoothly.

  Further, since the inclination angle of the operation pedal at the neutral position is the same as the conventional angle, the height of the front contact point at the neutral position is the same as the conventional height. Accordingly, the angle between the shin of the foot and the instep when the front part of the operation pedal is stepped downward at the toe part is the same as the conventional angle. As a result, the angle between the shin and the instep does not increase more than before, and the operation of stepping down the front portion of the operation pedal at the toe portion can be performed smoothly.

In the second aspect of the invention, the operation pedal is composed of a front pedal body and a rear pedal body,
A support shaft is provided at the joint between the front pedal body and the rear pedal body,
The rear pedal body is inclined upward with respect to the front pedal body,
A toe tread is formed on the front pedal body,
The tread surface is formed on the rear pedal body.

  According to this, the operator sits on the driver's seat and puts his feet on the operation pedal in the neutral position with the knee bent. At this time, the toe portion of the foot is placed on the toe tread surface of the front pedal body, and the heel portion is placed on the tread surface of the rear pedal body.

In the third invention, an auxiliary tread is provided at the rear of the operation pedal,
The auxiliary tread is inclined upward with respect to the upper surface of the operation pedal,
A toe tread is formed on the front of the operation pedal,
The tread surface is formed on the auxiliary tread.

  According to this, the operator sits on the driver's seat with his knees bent, and puts his feet on the operation pedal in the neutral position. At this time, the toe portion of the foot is placed on the toe tread surface of the front portion of the operation pedal, and the heel portion is placed on the tread surface of the auxiliary tread plate.

This 4th invention is a cylinder device provided with a piston rod which a work device can move in and out,
The vehicle body is provided with a control valve that switches the piston rod of the cylinder device to move in and out,
The spool of the control valve is linked and linked to the operation pedal via the linkage and connection mechanism.
The spool is urged to return to the neutral position by a spring built into the control valve,
The operating pedal is urged by the urging force of the spring so as to return to the neutral position in conjunction with the spool.

  According to this, when the operator depresses the front part of the operation pedal at the toe portion of the foot, the operation pedal swings forward from the neutral position with the support shaft as a fulcrum, and the control valve spool moves from the neutral position to one side. And the actuator is activated in one direction.

  Further, when the rear part of the operation pedal is depressed with the heel part of the foot, the operation pedal swings backward from the neutral position with the support shaft as a fulcrum, the spool moves from the neutral position to the other, and the actuator is Operates on the other side.

  When the foot is released from the operation pedal, the spool returns to the neutral position by the biasing force of the spring, and the operation pedal returns to the neutral position in conjunction with the spool by the biasing force of the spring.

  As described above, according to the present invention, the operation of stepping down the rear portion of the operation pedal with the heel portion of the foot and the operation of stepping down the front portion of the operation pedal with the toe portion can be performed smoothly.

Hereinafter, embodiments of the present invention will be described. In addition, about the same member as the conventional one demonstrated previously, the same code | symbol is attached | subjected and description is abbreviate | omitted.
(Embodiment 1)
First, the first embodiment will be described with reference to FIGS.

  The boom and bucket cylinder switching spools 39 and 40 are each urged to return to the neutral position by a plurality of springs 60 built in the control valve 33. The boom operating pedal 61 is biased so as to return to the neutral position N in conjunction with the boom cylinder switching spool 39 by the biasing force of each spring 60, and the bucket operating pedal 62 is moved to the bucket cylinder switching spool. It is urged so as to return to the neutral position N in conjunction with 40.

  The boom operation pedal 61 has a flat plate portion 61a, a side plate portion 61b suspended from the left and right sides of the flat plate portion 61a, and an upright plate portion 61c bent upward from the front and rear ends of the flat plate portion 61a. A plurality of holes 66 penetrating the front and back are formed in the flat plate portion 61a, and a protruding portion 67 protruding upward is formed at the peripheral edge of each hole 66.

  Further, the boom operation pedal 61 includes a front pedal body 69 and a rear pedal body 70. The boss 32 is provided at a joint portion between the front pedal body 69 and the rear pedal body 70, and the support shaft 29 is inserted through the boss 32. On the front pedal body 69, a toe tread surface 43 on which the toe portion 42 of the foot 41 is placed is formed. Further, on the rear pedal body 70, a foot tread surface 45 on which the foot portion 44 of the foot 41 is placed is formed. The toe tread surface 43 and the saddle tread surface 45 each include the upper end of the protruding portion 67.

  The rear pedal body 70 is inclined upward with respect to the front pedal body 69, so that the saddle tread surface 45 is inclined upward by a predetermined angle C with respect to the toe tread surface 43, not on the extension of the toe tread surface 43. is doing.

The bucket operation pedal 62 is also configured similarly to the boom operation pedal 61.
Hereinafter, the operation of the above configuration will be described.

  When the operator 48 sits on the driver's seat 27 and rotates the boom 21, the left foot 41 is placed on the boom operation pedal 61 at the neutral position N as shown in FIG. At this time, the toe portion 42 of the left foot 41 is placed on the toe tread surface 43 of the front pedal body 69 and the heel portion 44 is placed on the tread surface 45 of the rear pedal body 70.

  When the front part of the boom operation pedal 61 is depressed by the toe portion 42, the boom operation pedal 61 swings forward from the neutral position N with the support shaft 29 as a fulcrum, and the boom is connected via the boom interlocking connection mechanism 35. The cylinder switching spool 39 moves from the neutral position to one side, the piston rod 15b of the boom cylinder device 15 retreats (that is, operates in one direction), and the boom 21 rotates downward.

  Further, when the rear portion of the boom operation pedal 61 is depressed by the hook portion 44, the boom operation pedal 61 swings from the neutral position N to the rear R with the support shaft 29 as a fulcrum, and via the boom interlocking connection mechanism 35. The boom cylinder switching spool 39 moves from the neutral position to the other, the piston rod 15b of the boom cylinder device 15 protrudes (that is, operates to the other), and the boom 21 rotates upward.

  At this time, as shown in FIG. 3 (b), the point where the toe portion 42 contacts the front pedal body 69 is defined as a front contact point Pa, and the point where the collar portion 44 contacts the rear pedal body 70 is defined as a rear contact. Assuming that the contact point Pb is set, the foot tread surface 45 is not an extension of the toe tread surface 43 but is inclined upward by a predetermined angle C with respect to the toe tread surface 43, so that the left foot 41 is in a boom operation pedal 61 at the neutral position N. When placed on top, the height of the rear contact point Pb with respect to the front contact point Pa is higher than in the prior art. As a result, the angle β between the shin 46 of the left foot 41 and the upper 47 is larger than in the prior art (ie, the angle β in FIG. 3B> the angle α in FIG. 3A), and the boom operation is performed at the heel portion 44. The operation of depressing the rear part of the pedal 61 downward can be performed smoothly.

  Further, since the inclination angle A of the front pedal body 69 of the boom operation pedal 61 at the neutral position N is the same as the conventional angle, the height of the front contact point Pa at the neutral position N is also the same as the conventional height. (That is, the height of the front contact point Pa in FIG. 3A = the height of the front contact point Pa in FIG. 3B). Therefore, the angle β when the front part of the boom operation pedal 61 is stepped downward by the toe portion 42 is the same as the conventional angle (that is, β = α). As a result, the angle β does not increase more than before, and the operation of stepping down the front portion of the boom operation pedal 61 at the toe portion 42 can be performed smoothly.

  As shown in FIG. 1, when the left foot 41 is separated from the boom operation pedal 61, no pedal force is applied to the boom operation pedal 61, and the boom cylinder switching spool 39 is returned to the neutral position by the urging force of the spring 60. The boom operating pedal 61 returns to the neutral position N in conjunction with the boom cylinder switching spool 39 via the boom interlocking coupling mechanism 35 by the biasing force of the spring 60. As described above, the boom cylinder switching spool 39 can be returned to the neutral position and the boom operation pedal 61 can be returned to the neutral position N by using the biasing force of the spring 60 incorporated in the control valve 33. The number of springs can be reduced.

  The operation of the boom operation pedal 61 when rotating the boom 21 has been described above. However, when the bucket 22 is tilted forward and backward, the right foot 41 is placed on the bucket operation pedal 62 at the neutral position N. The same operation as that of the boom operation pedal 61 may be performed.

(Embodiment 2)
Next, the second embodiment will be described with reference to FIGS.
As shown in FIG. 4, an auxiliary tread plate 76 is provided at the rear of the boom operation pedal 61, and the auxiliary tread plate 76 is inclined upward with respect to the upper surface of the operation pedal 61. The toe tread surface 43 is formed at the front portion of the boom operation pedal 61, and the saddle tread surface 45 is formed at the upper portion of the auxiliary tread plate 76. As a result, the heel tread surface 45 is inclined upward by a predetermined angle C with respect to the toe tread surface 43 rather than on the extension of the toe tread surface 43.

  As shown in FIGS. 6 and 7, a plurality of through holes 85 are formed in the auxiliary tread plate 76. A bracket 77 is provided on the back surface of the auxiliary tread plate 76, and a pair of left and right connecting holes 78 are formed in the bracket 77. As shown in FIGS. 8 and 9, cylindrical collars 79 are inserted into the pair of left and right holes 66 at the tail of the flat plate portion 61a. A mounting plate 80 is disposed at the rear end of the back side of the flat plate portion 61a, and a pair of left and right mounting holes 81 are formed in the mounting plate 80.

  The collar 79 is inserted into the pair of left and right holes 66, the bracket 77 is brought into contact with the upper ends of the projecting portions 67 of the pair of holes 66, and the mounting plate 80 is brought into contact with the rear end of the back surface of the flat plate portion 61a. The bolts 82 are inserted from above through the through holes 85 of the auxiliary tread plate 76, both connecting holes 78 of the bracket 77, both collars 79, both mounting holes 81 of the mounting plate 80, and both bolts 82 from the back side of the flat plate portion 61a. The nut 83 is screwed. Accordingly, the auxiliary tread plate 76 is attached to the boom operation pedal 61.

The bucket operation pedal 62 is also provided with an auxiliary tread plate 76 having the same configuration as the boom operation pedal 61.
Hereinafter, the operation of the above configuration will be described.

  When the operator 48 sits on the driver's seat 27 with the knee bent and rotates the boom 21, the left foot 41 is placed on the boom operation pedal 61 at the neutral position N. At this time, the toe portion 42 of the left foot 41 is placed on the toe tread surface 43 of the front portion of the boom operation pedal 61 and the heel portion 44 is placed on the tread surface 45 of the auxiliary tread plate 76.

  At this time, since the toe tread surface 45 is not an extension of the toe tread surface 43 but is inclined upward by a predetermined angle C with respect to the toe tread surface 43, the left foot 41 is placed on the boom operation pedal 61 in the neutral position N. In this case, the height of the rear abutment point Pb with respect to the front abutment point Pa is higher than before. As a result, the angle β between the shin 46 and the upper 47 of the left foot 41 is larger than before (that is, angle β> angle α), and the operation of stepping down the rear portion of the boom operation pedal 61 with the heel portion 44 is smooth. Can be done.

  Further, since the inclination angle A of the boom operation pedal 61 at the neutral position N is the same as the conventional angle, the height of the front contact point Pa at the neutral position N is also the same as the conventional height. Therefore, the angle β when the front part of the boom operation pedal 61 is stepped downward by the toe portion 42 is the same as the conventional angle (that is, β = α). As a result, the angle β does not increase more than before, and the operation of stepping down the front portion of the boom operation pedal 61 at the toe portion 42 can be performed smoothly.

  The operation of the boom operation pedal 61 when rotating the boom 21 has been described above. However, when the bucket 22 is tilted forward and backward, the right foot 41 is placed on the bucket operation pedal 62 at the neutral position N. The same operation as that of the boom operation pedal 61 may be performed.

In each of the above embodiments, the protruding portion 67 is formed on the flat plate portion 61a of each operation pedal 61, 62, but the protruding portion 67 may not be formed.
In each of the embodiments described above, the skid steer loader 10 has been described as an example of the working vehicle. However, a working vehicle other than the skid steer loader 10, for example, a wheel loader may be used.

  In each of the above embodiments, two (plural) operation pedals 61 and 62 are provided to operate two types (multiple) of cylinder devices 15 and 16. However, one operation pedal is provided to provide one type. These cylinder devices may be operated, or three or more types of cylinder devices may be operated by providing three or more operation pedals.

  In each of the above embodiments, the hydraulic cylinder devices 15 and 16 are used as an example of the operating device, but an air cylinder device may be used. Moreover, you may use things other than a cylinder apparatus, for example, the motor etc. which can rotate forward / reversely.

  In each of the above embodiments, the working device 14 is configured by the boom 21 and the bucket 22, but another attachment (fork, drilling screw, etc.) other than the bucket 22 is attached to the boom 21. Also good.

  In each of the above-described embodiments, the working device 14 is configured by the boom 21 and the bucket 22, but is not limited to this configuration. For example, a fork, a digging screw, or the like is attached to the boom 21 as an attachment. The working device 14 having the configuration described above may be used.

It is a side view of the pedal for operation of a skid steer loader, a control valve, and an interlocking connection mechanism in Embodiment 1 of the present invention. It is a top view of the pedal for operation same as the above. It is a side view at the time of operating the operation pedal in Embodiment 1 of this invention and the conventional with a foot, (a) is operation of the conventional operation pedal, (b) is the operation pedal of Embodiment 1. Indicates operation. It is a side view of a pedal for operation of a skid steer loader, a control valve, and an interlocking connection mechanism in Embodiment 2 of the present invention. FIG. 3 is an enlarged side view of the rear end portion of the operating pedal. It is a side view of the auxiliary tread of an operating pedal. It is a XX arrow line view in FIG. FIG. 3 is an enlarged longitudinal sectional view of a rear end portion of the operating pedal. It is a XX arrow line view in FIG. It is a side view of the conventional skid steer loader. FIG. 3 is a plan view of the operation pedal, the control valve, and the interlocking connection mechanism. It is a side view of the pedal for operation same as the above. FIG. 5 is a side view of the operation pedal, the control valve, and the interlocking connection mechanism.

Explanation of symbols

10 Skid steer loader (work vehicle)
11 Car body 14 Work device 15, 16 Cylinder device (actuator)
15b, 16b Piston rod 27 Driving seat 29 Support shaft 33 Control valve 35, 36 Interlocking coupling mechanism 39, 40 Cylinder switching spool 41 Foot 42 Toe portion 43 Toe step surface 44 Reed portion 45 Recess surface 60 Spring 61, 62 Operation pedal 69 Front pedal body 70 Rear pedal body 76 Auxiliary tread board N Neutral position

Claims (4)

The vehicle body is provided with a work device, an operation device that operates in two directions to drive the work device, an operation pedal that operates the operation device, and a driver seat,
The operation pedal is provided so as to be swingable back and forth via a support shaft, and is urged so as to return to the neutral position.
When the operating pedal swings forward from the neutral position with the support shaft as a fulcrum, the actuator operates in one direction,
When the operating pedal swings backward from the neutral position with the support shaft as a fulcrum, the working vehicle is configured to operate to the other,
On the front part of the operation pedal, a toe tread surface for placing the toe part of the foot is formed,
On the back of the operation pedal, a tread surface for placing the heel part of the foot is formed,
The working vehicle characterized in that the tread surface is inclined upward with respect to the toe tread surface, not on an extension of the toe tread surface. The operation pedal consists of a front pedal body and a rear pedal body,
A support shaft is provided at the joint between the front pedal body and the rear pedal body,
The rear pedal body is inclined upward with respect to the front pedal body,
A toe tread is formed on the front pedal body,
2. The work vehicle according to claim 1, wherein the tread surface is formed on the rear pedal body. An auxiliary tread is provided at the rear of the operation pedal,
The auxiliary tread is inclined upward with respect to the upper surface of the operation pedal,
A toe tread is formed on the front of the operation pedal,
2. The work vehicle according to claim 1, wherein the tread surface is formed on an auxiliary tread. The working device is a cylinder device with a retractable piston rod,
The vehicle body is provided with a control valve that switches the piston rod of the cylinder device to move in and out,
The spool of the control valve is linked and linked to the operation pedal via the linkage and connection mechanism.
The spool is urged to return to the neutral position by a spring built into the control valve,
The working vehicle according to any one of claims 1 to 3, wherein the operating pedal is biased by the biasing force of the spring so as to return to the neutral position in conjunction with the spool.

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