Patent ID: 7877993

Claim:
A shift operating device of a traveling vehicle that slants a swash plate of a hydraulic pump or a swash plate of a hydraulic motor of a HST by operating a forward traveling pedal and a rearward traveling pedal provided separately, characterized in that: the forward traveling pedal and the rearward traveling pedal are rotatably supported by an installation plate fixed to a vehicle frame; the installation plate rotatably supports a shift operating interlock rotary sleeve connected through one link to a basal end of the forward traveling pedal and through one link to a basal end of the rearward traveling pedal respectively; the shift operating interlock rotary sleeve is rotated forward and rearward interlockingly with operation of the forward traveling pedal and the rearward traveling pedal; a swash plate slant angle control mechanism, interlockingly connected to control arms linked with swash plates of the hydraulic pump and the hydraulic motor of the HST, is interlocked with the shift operating interlock rotary sleeve; the swash plate slant angle control mechanism rotatably supports a first arm interlockingly connected through a first link to the control arm of the hydraulic motor and a second arm interlockingly connected through a second link to the control arm of the hydraulic pump, and a rotary member on a same axis; the rotary member is connected through one link to the shift operating interlock rotary sleeve and is rotated forward and rearward following the forward and rearward rotation of the shift operating interlock rotary sleeve; the first arm is rotated integrally with the rotary member and is in parallel to the first link when neither the forward traveling pedal nor the rearward traveling pedal are treaded so as to move the first link when either the forward traveling pedal or the rearward traveling pedal is treaded; and the second arm is interlocked with the rotary member so that the second arm is rotated to move the second link toward one side when the forward traveling pedal is treaded and to move the second link toward other side when the rearward traveling pedal is treaded.