PURPOSE: To facilitate installation works for the shift operation structure of a working vehicle by mounting a speed fixing mechanism and a control lever on a supporting shaft for a shift pedal, and arranging the speed fixing mechanism so that it is disengaged in linkage with stamping of a brake pedal.
CONSTITUTION: A speed fixing mechanism C is composed of a stationary disc secured to a supporting shaft 3 for a shift pedal P, slide disc 9b, spring 10, and rotary cams 11a, 11b. The spring 10 energizes the slide disc 9b in the direction apart from the stationary disc 9a. The rotary cam 11b is fitted on the supporting shaft 3 slidably, while the other rotary cam 11a is fitted on the supporting shaft 3 with possibility of relative rotation and is coupled with a control lever L. The rotary cam 11a is coupled with a brake pedal B through a rod 12. When the brake pedal B is stamped, the rotary cam 11a is put in operation, and the rotary cam 11b is slid by the spring 10 in the direction of separation. Releasing the brake pedal B from stamping should generate motion in the direction of fixing.
MURAKAWA MASATAKE
KURE SEIJI
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