| 摘要 |
PURPOSE:To prevent occurrence of braking by a brake, which imposes as overload to a hydraulic motor, so as not to damage the hydraulic pump or motor by constituting the system in such a manner that the speed change lever automatically returns to the neutral position as soon as quick braking action is applied. CONSTITUTION:When a brake pedal 1 and an arm 2 are in an unbraked state, a interlocking link 3 returns within the oval hole 4a of a guide arm 4, while the guide arm 4 can be freely operated by a speed change operating lever 8 within a limitation of a length of the oval hole 4a. Once the brake pedal 1 is stepped on, however, the arm 2 makes its turning motion its braking position 2' while the interlocking line 3, is also pulled by the arm 2 so as to make turning movement to a position 3'. Thus, the after end of the interlocking link 3 is engaged with the front end of the oval hole 4a, and the guide arm 4 is forcible to make forming movement to a position 4' that is in line with the interlocking link 3. |
