| 摘要 |
<p>A hitch coupler (100) for a mechanical excavator or similar equipment comprises a body portion (110) having a fixed jaw (112) formed integrally with the body portion. The hitch coupler comprises an engagement mechanism for attaching and detaching the hitch coupler to the carrying bars (12, 14) of an attachment (10). The engagement mechanism comprises sliding jaw (118) and a locking member (120), each mounted for sliding engagement within the body portion, coupled by a double-acting actuator (122) and spring mechanism comprising a helical spring (132) mounted on a telescopic former (134). The engagement mechanism may be switched between a first condition in which the actuator is retracted and the locking member is clear of the fixed jaw, and a second condition in which the actuator is extended, the locking mechanism cooperates with the fixed jaw to retain a carrying bar of an attachment therein, and the moveable jaw engages another carrying bar of the attachment. The spring mechanism is biased to prevent disengagement of an attachment with the hitch coupler in the event of failure of the actuator.</p> |
