| 摘要 |
PURPOSE:To prevent switching of a hydraulic changeover valve even when an external force acts on a spool of the hydraulic changeover valve or a bellcrank thereof by fixing an operating rod to a support member at a neutral position of the changeover valve. CONSTITUTION:A ball 4 falls in an annular groove 11 (12) provided in the operating member with respect to the movement of the operating member 10, and the fixture between an operating rod 6 and a support member 8 is released. Simultaneously, a part of the operating member 10 makes contact with a stopper 16 (operating rod 6), the operating member 10 and the operating rod 6 move unitarily, and the hydraulic changeover valve 1 is switched through a bellcrank 3 and a spool 2. After completion of the operation, the valve 1 is returned to a neutral position (not shown), the operating rod 6 is fixed to the support member 8 by the ball 14 in this state, and hence the hydraulic changeover valve 1 is not switched by the external force from the spool 2 or the bellcrank 3. |
