| 摘要 |
A ratchet pulley includes a housing, a hub, an annular pulley and a selection device. The housing has two openings for a rope to go into and go out of the housing. The hub is received in the housing and reciprocally movable between an upper position and a lower position. The annular pulley is received in the housing and rotatable on the circumference of the hub. The rope is wound over the annular pulley. The selection device is disposed in the internal space of the hub and has a rotatable rod exposed to outer side for selecting whether the rotational direction of the annular pulley is limited or not limited or is limited when the rope is pulled and the annular pulley is loaded. |
