| 摘要 |
The invention provides a clutch mechanism (200) having a driven pulley (32) and a drive pulley (34) to which a load is applied, the clutch mechanism (200) having an engaged position in which torque applied in use to the driven pulley (32) is transmitted to the drive pulley (34), and a disengaged position in which torque applied in use to the driven pulley (32) is not transmitted to the drive pulley (34), wherein the clutch mechanism (200) also has override means (238, 242) by which at least a proportion of the torque applied to the driven pulley (32) is absorbed when the load applied to the drive pulley (34) exceeds a predetermined value. The invention also provides a clutch mechanism (200) having a driven pulley (32) and a drive pulley (34) to which a load is applied, the clutch mechanism (200) having an engaged position in which the torque applied in use to the driven pulley (32) is transmitted to the drive pulley (34), and override means whereby at least a proportion of the torque applied in use to the driven pulley (32) is absorbed when the load applied to the drive pulley (34) exceeds a predetermined value, the override means comprising a pair of detent plates (238, 242), the detent plates being pressed together so as to transmit torque therebetween in the engaged position, and the detent plates (238, 242) being rotatable with respect to one another when override occurs, and at least one ball-bearing (248) being held captive between the detent plates (238, 242), the detent plates (238, 242) being adapted so as to retain the at least one ball-bearing (248) within a groove in each detent plate, wherein each groove is continuous about the axis of rotation of the detent plates.
|
