JP6315405B2 - Transporter operation device - Google Patents

Description

  The present invention relates to an operating device for restraining a high-speed traveling operation during a walking driving operation in a passenger / walking transport vehicle provided with a driver's seat and a front / rear shiftable handle at a front end portion of a vehicle body.

  A technique (for example, refer to Patent Document 1) is known in which a change lever of a gear transmission is interlocked with a low speed or a neutral position or a shift to a shift position is controlled by operating a handle to a walking operation form position. Yes.

JP 2003-39967 A

  For transport vehicles that often travel on uneven surfaces such as farm scenes and farm roads, the change lever at the time of the walking operation mode is changed to a low speed gear shifting position or a neutral position. The lever may be vibrated or swung by a steering wheel front-rear movement operation or a traveling vibration of a transport vehicle, etc., so that the transmission gear may be erroneously operated or an accurate check position may not be maintained.

According to the first aspect of the present invention, the driving operation handle 4 is provided so as to be able to be shifted in the front-rear direction between the riding driving position r and the walking driving position f with respect to the handle post 5, and the low-speed L and high-speed H belts 49 for driving transmission , 50 and tension clutch pulleys 44, 45, and an operation device for a transport vehicle provided with a traveling clutch lever 40 in the form of a double tension clutch that presses the tension clutch pulleys 44, 45 against the rotating peripheral surfaces of the belts 49, 50. When the travel clutch lever 40 is operated to the high speed H position and the handle clutch 4 is operated to the walking operation position f when the high speed H side tension clutch pulley 45 is in the clutch-engaged state, When the lever 40 is operated to the cut position and the handle 4 is in the walking driving position f, the traveling clutch lever Providing the restraining mechanism 61 for restraining the operation to the high speed position H impossible state of 0 and configuration of the truck of the operating device according to claim.

  By driving the engine 21, the vehicle can travel with low-speed L or high-speed H transmission through the low-speed L belt 49 in the form of double tension clutch pulleys 44 and 45 and the high-speed H belt 50. In the riding operation in which the driver sits on the driver's seat 3 and travels, the steering wheel 4 is rearwardly moved. Therefore, when the traveling clutch lever 40 is operated to the low speed L position, the belt 49 tension clutch on the low speed L side. The pulley 44 presses the belt 49 and can travel at a low speed L. Further, the traveling clutch lever 40 travels at a high speed H with the belt 50 tension clutch pulley 45 on the high speed H side. As described above, during the riding operation, even when the travel clutch lever 40 is operated to either the low speed L or the high speed H position, it is possible to travel at the travel speed by the target speed change operation.

When the steering wheel 4 is moved forward with respect to the steering wheel post 5 for walking, the traveling clutch lever 40 can be operated to enter the low speed L side. However, when operated to the high speed H side, the check mechanism 61 works, and the travel clutch lever 40 cannot enter the high speed H side and cannot be operated, so that the high speed H side tension clutch pulley 45 cannot be pressed against the high speed H belt 50. Thus, high-speed H traveling is restrained. When the travel clutch lever 40 is at the high speed H position, when the handle 4 is transferred to the walking operation position f with respect to the handle post 5, the check mechanism 61 is operated by the operation of the handle 4 and travels. The clutch lever 40 is returned to the disengaged position and high speed H transmission is not performed, and high speed H traveling is prevented.

  Thus, in the operation to the high speed H position of the traveling clutch lever 40 at the walking driving position f, or the transfer operation to the walking driving position f of the handle 4 when the traveling clutch lever 40 is at the high speed H position, The check mechanism 61 configured between the handle 4 and the travel clutch lever 40 prevents the operation of engaging the clutch at the high speed H position, or operates the travel clutch at the high speed H position to disengage the high speed H transmission. Even if the travel clutch lever 40 is greatly swung or misoperated after the check, the belt 50 tension clutch pulley 45 of the high-speed H transmission is not engaged and can be operated accurately and safely. it can.

  The invention according to claim 2 is provided with a lever shaft 51 of an operation rotating portion of the travel clutch lever 40 in a position close to the position of the handle support shaft 62 portion of the handle 4 rotating forward and backward with respect to the handle post 5. A check mechanism 61 is provided between the handle support shaft 62 and the lever shaft 51.

  A handle 4 that can be rotated in the front-rear direction is supported at the upper end of the handle post 5 by a handle support shaft 62, and the travel clutch lever 40 is supported by a lever shaft 51. The handle support shaft 62 and the lever shaft 51 portion are appropriately close to the interval position, and the check mechanism 61 provided between the handle support shaft 62 portion and the lever shaft 51 portion of the travel clutch lever 40 is used for this. When operating the steering wheel 4 to the walking driving position f, or when operating, the travel clutch lever 40 is operated to the travel clutch disengagement position, or the operation to the high speed H position is restrained to an impossible state, It is possible to perform safe walking driving and switch to walking driving.

  Since the check mechanism 61 is provided between the handle support shaft 62 and the traveling clutch lever shaft 51, the check mechanism 61 can be small, simple, and not obstructing the driving operation.

  According to the third aspect of the present invention, the switching operation is performed between the clutch yoke 52 that links the belt 49 tension clutch pulley 44 for low speed L travel transmission and the clutch yoke 53 that links the belt 50 tension clutch pulley 45 for high speed travel transmission. A traveling clutch lever 40 is provided, and one end of a restraining arm 63 is linked to a high-speed H-side clutch yoke 53 that is integrally rotated by the engagement of the traveling clutch lever 40. The other end of the restraining arm 63 is a handle. When a check mechanism 61 that rotates in association with the arcuate guide hole 65 of the plate arm 64 that is integral with the support shaft 62 is configured to operate the travel clutch lever 40 to the high speed H position, When the handle 4 is operated to the walking operation position f, the travel clutch lever 40 is returned to the clutch disengagement position, and the handle 4 is When the row driver position f is characterized by restraining the disabled state of operation to the high speed position H of the running clutch lever 40.

  The handle 4 on the handle post 5 of the transport vehicle has a front-rear direction in a riding driving position r that the driver sits on the driver's seat 3 and operates and a walking driving position f that the driver operates while walking on the ground. You can switch to and operate. Then, by operating the traveling clutch lever 40, the pair of left and right clutch yokes 52, 53 are selectively engaged, and the tension clutch pulley 44 of the low speed L belt 49 or the tension clutch pulley 45 of the high speed H belt 50 is engaged. It is possible to perform driving while switching between low-speed L and high-speed H transmissions by interlocking operation.

  When the travel clutch lever 40 is engaged with the high-speed H-side clutch yoke 53 and rotated, the check mechanism 61 operates to switch the handle 4 to the walking operation position f. Absent. In addition, when the handle 4 has already been operated to the walking operation position f, the transfer position of the handle 4 must be operated to the walking operation position f even if the travel clutch lever 40 is to be operated to the high speed H transmission side. As a result, the operation of the traveling clutch lever 40 toward the high speed H transmission side is restrained, and it is not possible to perform walking driving traveling with the high speed H transmission.

  According to the first aspect of the present invention, the check mechanism 61 works so that high-speed H traveling cannot be performed during the walking operation of the transport vehicle, and the safety of the driving operation can be increased. When the steering wheel 4 is in the normal riding operation position r, the traveling clutch lever 40 can be operated to either the low speed L position or the high speed H position. When the handle 4 is in the walking driving position f, the traveling clutch lever 40 is restrained from entering the high speed H side, and the maximum speed is inevitably limited.

  When the traveling clutch lever 40 is in the high speed H side and the steering wheel 4 is transferred to the walking operation position f, the check mechanism 61 is activated and the traveling clutch lever 40 is turned off. Therefore, naturally, the traveling clutch lever 40 cannot be put in the high speed H position if it is left as it is. In the transmission mode of the traveling clutch by the belt tension clutch pulleys 44 and 45 as described above, the influence of the operating force of the traveling clutch lever 40 on the pressure of the belt tension clutch pulleys 44 and 45 is small, and the traveling clutch lever. The swinging or vibrating action of the motor 40 is blocked by the check mechanism 61 so that the belt tension clutch pulleys 44 and 45 are prevented from malfunctioning, and an accurate and safe driving operation is performed. It can be carried out. Moreover, since the check mechanism 61 is interposed between the handle support shaft 62 portion and the lever shaft 51 portion of the travel clutch lever 40, it is possible to simplify the configuration and hardly disturb the operation. Maintenance can be improved.

  In the invention according to claim 2, since the check mechanism 61 is provided on the upper portion of the handle post 5 as described above, the configuration is reduced in size and simplified, and the operation of the transport vehicle is facilitated to improve operability. Can do. Further, even if the traveling clutch lever 40 is swung due to vibration, swinging, etc. during driving of the transport vehicle, it is difficult to interfere with the belt tension clutch pulley 45 side, and malfunction can be prevented. Further, the restraining mechanism 61 is configured in a compact form between the handle support shaft 62 and the lever shaft 51, so that the maintenance performance can be improved and can be produced at low cost.

  According to a third aspect of the present invention, in the normal riding operation, the check mechanism 61 can select either the low speed L or the high speed H by selecting the left and right clutch yokes 52 and 53 by operating the travel clutch lever 40. While the vehicle can be freely operated to travel, the travel clutch lever 40 and the clutch yoke 53 are not operated to the high speed H side during the walking operation, or the travel clutch lever 40 is not operated. Is already in the high speed H traveling transmission position, when the handle 4 is switched to the walking operation position f, the traveling clutch lever 40 is returned to the disengaged position by turning the handle 4 so that the high speed H during the walking operation is restored. It is possible to check the travel, and to easily configure the check mechanism 61. The belt tension pulley 45 is erroneously caused by the vibration of the travel clutch lever 40 or the like. With less malfunction as actuated Ri, a precise, it is possible to perform the switching operation safe walking operation.

The side view of a transport vehicle. The plan view. The front view. The front view which shows the one part operation state. The top view of a driving | running floor part. The side view. The front view. The front view of a handle part. The perspective view of an operation panel part. The perspective view of an operation panel part. The side view which shows the transfer state of a handle | steering-wheel part. The side view of a steering wheel part at the time of boarding driving. The side view which shows the operation state of the driving | running | working clutch lever part and a lock pin part. The side view which shows the operation state of a steering wheel and a driving | running | working clutch lever part. The side view of the handle sensor part which detects the transfer position of a handle. The perspective view of a forward-reverse lever part.

  On the basis of the drawings, the transport vehicle is provided with a pair of left and right front wheels 19 at the front portion of the vehicle body 1 so as to be steerable, and a pair of left and right rear wheels 20 are mounted on the rear portion. The rear wheel 20 or the front wheel 19 is driven in an interlocked manner by the engine 21 mounted on the vehicle so as to have a four-wheel traveling configuration. On the rear part of the vehicle body 1, a dump bed 24 is provided around the dump shaft 23 by the extension and contraction of the dump cylinder. A driving floor 2 is provided at the front end portion of the vehicle body 1 so as to project forward from the space between the left and right front wheels 19, and a handle post 5 having a handle 4 is erected at the center of the front portion of the floor 2. The driver can steer the front wheel 19 by gripping the left and right handles 4 and rotating the handle post 5 about the steering axis in the vertical direction.

  The central portion of the driving floor 2 is formed across the space between the left and right front wheels 19, and the right and left side edges are connected to the lower end of the fender 18 that covers the upper peripheral portion of the front wheel 19. The engine 21 is mounted on the rear side of the space between the left and right front wheels 19 and the upper periphery is covered with the seat base 6 to form the engine room 10. This sheet base 6 is configured to be made of sheet metal widely across the side, with both ends positioned on the upper surface of the fenders 18 on both left and right sides. The seat base 6 constitutes a driver seat 3 at a substantially central position in the lateral width direction, and a bench panel 9 having a substantially flat surface is formed on one side of the driver seat 3. On the other side, a side bench 15 is formed which is low and uneven. The side bench 15 is configured in a different form from the seat base 6, but may be integrally connected.

  A sheet receiving portion 8 having an appropriate depth is formed in a concave shape at the center of the sheet base 6, and a sheet mat 7 having a predetermined thickness is fitted and supported. The upper surface of the seat mat 7 is formed to be approximately the same height as the upper surface of the bench panel 9 on one side to form a seating surface for the driver. It is also preferable that the upper surface of the sheet mat 7 is formed slightly higher than the bench panel 9 surface. In addition to the bench panel 9, a side edge 26 is formed on the side opposite to the bench panel 9, and a front edge 27 is formed on the front side. The rear edges 28 are each formed in an appropriate width on the rear side.

  On the left and right sides of the sheet mat 7 to be fitted and supported by the sheet receiving portion 8, ridges 13 are formed along the front-rear direction. The ridge 13 is formed by bulging the left and right side end portions of the surface of the seat mat 7 upward to an appropriate height in a mountain-shaped cross section, and prevents the collar from sliding out of the seating surface. The protrusions 13 are formed in a straight line shape from the front and rear intermediate positions of the sheet mat 7 to the rear end along the left and right end portions of the sheet mat 7.

  Further, a loop-shaped handle 14 is provided along the front-rear direction on the bench panel 9 part along the outer periphery of the seat receiving part 8 and the side edge 26 part on the opposite side. It can be easily gripped. Further, a backrest 29 is provided at the edge 28 of the rear side portion of the seat receiving portion 8 so that the driver can lean. An opening 31 is formed in the center of the bench panel 9 so as to face the fuel tank 30 on the side of the engine room 10. The opening 31 is formed in the rear side as much as possible, and the surface of the bench panel 9 on the front side of the opening 31 is formed widely.

  On the outer peripheral edge portion of the seat base 6, a peripheral edge portion having an appropriate downward height can be formed to close the outer upper peripheral portion of the engine room 10. The rear side portion of the outer end of the seat base 6 is attached to the periphery of the rotating hinge 12 provided in the outer portion of the engine room 10 so that the seat base 6 can be vertically opened and closed. The upper part of the engine room 10 can be widely opened by lifting and raising and rotating to the upper side of the rotating hinge 12 on the opposite side.

  The engine room 10 forms an apron 17 between the left and right fenders 18 to partition the foot space on the upper side of the floor 2 on the front side. The apron 17 is made of sheet metal or resin plate, and by closing the seat base 6, the lower edge of the front edge 27 portion is polymerized close to the upper surface of the apron 17, and the front side surface portion of the engine room 10. Can be kept sealed.

  The side bench 15 formed on the left hand side of the seat base 6 is formed in a lower step shape on the upper side of the fender 18, and a lever guide 32 for guiding the operation lever 16 is provided on the rear side portion of the side bench 15. The operation lever 16 includes a change lever 33 for switching the traveling direction of the vehicle body 1 to forward and reverse, a two-wheel drive for switching the interlocking state of the wheel to a two-wheel drive, a four-wheel drive, a four-wheel drive switching lever 34, and a dump capable of dumping the cargo bed 24 It has a lever 35 and the like. The change lever 33 is used to switch the transmission device of the front wheel 19 and the rear wheel 20 to forward traveling side transmission or to switch to the backward traveling side transmission. Further, the two-wheel drive / four-wheel drive switching lever 34 can drive only the rear wheel 20 to drive two-wheel drive, or drive the front wheel 19 and the rear wheel 20 simultaneously to drive four-wheel drive. The dump lever 35 operates the dump valve of the loading platform 24 by operating the switching valve of the hydraulic circuit of the dump cylinder 22. When performing such an operation lever 16, the driver sitting on the seat mat 7 extends the left hand to the lateral rear side position through the protrusion 13 and the handle 14, and selectively holds the operation lever 16. A predetermined operation can be performed.

  An accelerator pedal 36 and a brake pedal 37 are provided on the left foot side of the floor 2, and a clutch pedal 38 is disposed on the left foot side. At the upper end of the handle post 5, a travel clutch lever 40 that is guided back and forth by being guided by a U-shaped guide 39 and a brake lever 42 that is guided by a guide 41 and rotated back and forth are provided. By rotating the traveling clutch lever 40 in the front-rear direction, the transmission belt can be tensioned to switch to the traveling transmission state or to the non-transmission state. One side of the U-shaped guide 39 is a low speed L side, and the other side is a high speed H side. When the traveling clutch lever 40 is guided from the rear end portion to the lower braking position B, the brake lever 42 rotates toward the rear end portion C of the guide 41 as the traveling clutch lever 40 rotates, and the brake is applied. Can do. When the brake lever 42 is positioned at the front portion of the guide 41, the brake is released. When the brake lever 42 is operated at the rear end portion C, the brake is braked (parking brake).

  The tension clutch pulleys 44 and 45 by the operation of the travel clutch lever 40 are provided so as to be able to rotate and swing around the tension arm shaft 46, and an engine pulley EP mounted on the output shaft 47 of the engine 21 and an input pulley 48 on the travel transmission side. The low-speed L belt 49 and the high-speed H belt 50 are pressed against each other, and the low-speed L or high-speed H belt tension clutch is turned on and off. The tension clutch pulleys 44 and 45 are operated by operating the travel clutch lever 40 on the handle post 5, clutch yokes 52 and 53 disposed on the lever shaft 51, pull arms 54 and 55, and wires 56 and 57 connected thereto. The belts 49 and 50 are pressed via the clutch to engage and disengage the clutch. In addition, the clutch petal 38 is linked to the arms of the tension clutch pulleys 44 and 45 via the wire 58 so that the clutch pedal 38 can be operated even when the traveling clutch lever 40 on the handle 4 side is in the “ON” state. By stepping on, transmission by the tension clutch pulleys 44 and 45 can be cut off.

  A handle shaft 62 formed at the center of the bifurcated handle 4 is provided at the upper end of the handle post 5 so as to be able to rotate back and forth, and a lever shaft is located near the rear upper part of the handle support shaft 62. 51 is arranged. The handle support shaft 62 and the lever shaft 51 are appropriately close to each other, and the handle 4 is moved to the walking operation position by a check mechanism 61 provided between the handle support shaft 62 and the lever shaft 51. When operating to f or during operation, the travel clutch lever 40 is operated to the travel clutch disengagement position, or the operation to the high speed H position is suppressed to an impossible state to perform a safe walking operation. be able to. A pair of left and right clutch yokes 52, 53 are rotatably supported around the lever shaft 51, and a brake lever 42 and a brake yoke 60 are rotatably provided at the outer end of the low speed L side clutch yoke 52. The spring 59 is tensioned outward. The base portion of the travel clutch lever 40 is provided so as to be turnable in the left-right direction with respect to a metal boss 66 that is fitted and supported around the lever shaft 51 so as to be turnable. The clutch yokes 52 and 53 can be engaged to rotate in the front-rear direction. The clutch yokes 52 and 53 are linked to the clutch arms 69 and 70 of the tension clutch pulleys 44 and 45 via the linkage arms 67 and 68, and the wires 56 and 57 are linked. Further, the brake yoke 60 is linked to a brake braked by the brake pedal 37 via a linkage arm and a wire, and operates the brake lever 42 during the walking driving operation to apply the traveling brake. be able to.

  A plate in which an upper end portion of a check arm 63 is linked to a high-speed H-side clutch yoke 53 supported around the lever shaft 51, and a guide roll 71 provided at the lower end portion of the check arm 63 is fixed to the handle shaft 62. The operation position of the high-speed H-side clutch yoke 53 is controlled by the position of the handle 4 by fitting and linking with an arcuate guide hole 65 formed in the arm 64.

  When the traveling clutch lever 40 is operated to the high speed H position as shown in FIG. 11 and the high speed H side tension clutch pulley 45 is in the clutch “on” state, the high speed H side clutch yoke 53, Then, the check arm 63 is pulled back, and the guide roll 71 of the check arm 63 is positioned at the rear end edge of the guide hole 65 and is in the engaged state. When the operation position is operated, the travel clutch lever 40 is rotated to the clutch “disengaged” position via the check arm 63 and the clutch yoke 53. (B in FIG. 11) When the handle 4 is in the walking operation position f, the guide roll 71 of the check arm 63 is in the walking operation position f even if the travel clutch lever 40 is operated to the high speed H position. The travel clutch lever 40 cannot be operated to the front high speed H position because it is engaged with the rear end edge of the guide hole 65 of the plate 64. (A in FIG. 14)

  Further, when the travel clutch lever 40 is rotated from the cutting position N of the rear end portion of the guide 39 to the braking position B, the brake yoke 60 and the brake lever 42 are moved around the lever shaft 51 around the rear end of the guide 41. The brake can be moved by rotating to the part C side (FIG. 9). 11 and 13, mainly, a lock lever 73 for projecting and retracting a lock pin 72 for locking the front-rear rotation position of the handle 4 is provided below the handle shaft support 62 portion. 73, by engaging the lock pin 72 with the pin hole 75 formed in the metal 74 on the handle shaft support 62 side, the handle 4 is moved to the front walking operation position f, the rear riding operation position r, Or it can fix to the upright position t etc. of the front-back intermediate part. The upright position t can be temporarily fixed at a position where the steering wheel 4 is erected forward from the riding driving position r so that the steering wheel 4 does not get in the way when the driver gets on and off. Is switched to the riding position r.

  Further, mainly in FIG. 12, a limit switch 76 for detecting the clutch engagement position of the travel clutch lever 40 is provided on the inner side of the handle post 5, and the engine 21 is detected by detecting the clutch engagement of the limit switch 76. It is configured not to start. Further, mainly in FIG. 15, a handle sensor including a limit switch 77 for detecting the rotational position of the cam 78 is provided on the outer peripheral portion of the handle shaft support 62, and the handle 4 is in the walking operation position. At f, when the change lever 33 enters the forward second speed F2 position, the engine 21 is operated so as not to be stopped or started.

  Further, mainly in FIG. 16, the lever guide 32 of the change lever 33 is provided along the outer edge (opposite to the side where the driver's seat 3 is located) of the guide hole 79 in the front-rear direction in which the lever 33 is guided. In this embodiment, the reverse R, the forward first speed F1, the forward second speed F2, and the convex portion NC between the concave portions for stopping the speed change operation position of the change lever 33 and the convex portions NC between the respective concave portions are alternately formed. Yes. Further, at the base of the change lever 33, the change lever 33 is supported on the bracket 80 of the rotating boss 81 so as to be swingable in the horizontal direction by a support pin 82, and is urged outward by a spring 83. Yes. The rotating boss 81 is configured to link the push-pull wire 85 to the arm 84 so as to link the transmission gear of the transmission case 86 disposed at the rear of the vehicle body 1. When the limit switch 88 is provided opposite to the protrusion 87 of the rotating boss 81, the change lever 33 is operated to the second speed position F2, and the handle 4 is in the walking driving position f. The engine 21 is controlled not to be stopped or started. As for the operation of the change lever 33, the driver sitting on the driver's seat 3 side extends his hand to the rear side, holds the change lever 33, resists the spring 83, and moves from each recess to the guide hole 79 side. Pulling out and rotating in the front-rear direction, the target concave portion is operated to a position such as forward first speed F1, forward second speed F2, or reverse R.

4 Handle 5 Handle Post 40 Traveling Clutch Lever 44 Tension Clutch Pulley 45 Tension Clutch Pulley 49 Belt 50 Belt 51 Lever Shaft 53 Clutch Yoke 61 Check Mechanism 62 Handle Support Shaft 63 Check Arm 64 Plate Arm 65 Guide Hole H High Speed L Low Speed f Walking Operation Position r Ride position

Claims (3)

The driving operation handle (4) is provided so as to be able to be switched in the front-rear direction between the riding driving position (r) and the walking driving position (f) with respect to the handle post (5), and the driving transmission is low (L), high speed (H ) Belts (49), (50) and tension clutch pulleys (44), (45) are provided, and these tension clutch pulleys (44), (45) are pressed against the circumferential surfaces of the belts (49), (50). In the operating device for a transport vehicle provided with a traveling clutch lever (40) in the form of a double tension clutch to be operated, the traveling clutch lever (40) is operated to a high speed (H) position, and a high speed (H) side tension clutch pulley is operated. When the handle (4) is operated to the walking operation position (f) while the clutch (45) is in the clutch engaged state, the travel clutch lever (40) is operated to the disengaged position. When the handle (4) is in the walking driving position (f), a check mechanism (61) is provided that checks the operation of the travel clutch lever (40) to the high speed (H) position in an impossible state. The operation device of the transport vehicle.   A lever shaft (51) of the operation rotating portion of the travel clutch lever (40) is provided close to the position of the handle support shaft (62) portion of the handle (4) for reciprocating rotation of the handle (4) with respect to the handle post (5). The operation device for a transport vehicle according to claim 1, wherein a check mechanism (61) is provided between the handle support shaft (62) and the lever shaft (51).   A clutch yoke (52) that links a belt (49) tension clutch pulley (44) for low speed (L) travel transmission and a clutch yoke (52) that links a belt (50) tension clutch pulley (45) for high speed (H) travel transmission ( 53) is provided with a traveling clutch lever (40) that is switched to the high-speed (H) side clutch yoke (53) that is integrally rotated by the engagement of the traveling clutch lever (40). The other end of the check arm (63) is engaged with the arcuate guide hole (65) of the plate arm (64) integral with the handle support shaft (62), and the link is rotated. If the steering mechanism (61) is operated to the walking driving position (f) while the traveling clutch lever (40) is operated to the high speed (H) position, the driving mechanism (61) is configured. When the clutch lever (40) is returned to the clutch disengagement position and the handle (4) is in the walking operation position (f), the operation of the travel clutch lever (40) to the high speed (H) position is disabled. The operation device for a transport vehicle according to claim 1, wherein the operation device is controlled.

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