| 摘要 |
<p>The invention comprises a winch, including a chain wheel (10, 11) mounted on a spindle (1). A clutch (11) provided to selectively engage or disengage the chain wheel (10, 11) with the spindle (1). A clutch nut (27) having a central aperture, is movable rotationally and longitudinally on the spindle (1) by way of mutually engaging threads (4) on the spindle (1) and central aperture. A stop (30) is provided on the spindle, to prevent longitudinal movement of the clutch nut (27) away from the chain plates beyond a predetermined position. A carrier (24) rotates on the spindle (1) and a rotational direction limiting means is provided between the carrier (24) and the spindle (1). Rotation means rotate the carrier (24) with respect to the clutch nut (27) so that by rotating the rotation means in one direction the clutch nut (27) is moved towards the chain wheel to cause the chain wheel to be rotated by the spindle (1), and by rotating the rotation means in the opposite direction, the clutch nut (27) moves away from the chain wheel to release the chain wheel from the spindle (1), engagement of the clutch nut (27) with the stop (30) causing the carrier (24) to rotate thereby rotating the chain wheel without rotation of the spindle (1). Other related constructions are provided.</p> |
