| 摘要 |
<p>The support (1) has a returning unit e.g. spring-blade (70), for returning a claw (30) into a retracted position. A frame (10) comprises a return unit (17), which has an opening (12) through which a screw (50) is engaged. The returning unit comprises a mounting portion (71), which is movably mounted relative to the frame between a nut (90) and the returning unit. The returning unit comprises an actuating portion e.g. branch (72), which cooperates with the claw to bring the claw into the retracted position during unscrewing of the screw.</p> |
