| 摘要 |
There is provided an overload protection means, including a locking mechanism (13) disposed for acting between a hub disc (6) and a body (1) and a biasing means (11) for biasing said hub disc (6) towards a drive member (7); so that when a load exceeds a predetermined value, said drive member (7) screw threadedly moves in a direction towards hub disc (6) to move said hub axially of a drive shaft (4) and actuate said locking mechanism (13), whereby rotation of said hub disc (6) and a load sheave (3) is prevented, thereby halting lifting of the load. |
