| 摘要 |
In a mechanism (10) for converting oscillatory rotation of an input shaft (12) to unidirectional rotation of an output shaft (14), two bevel gears (40,42) are mounted around the input shaft and a bevel gear (44) intermeshed therewith is coupled to the output shaft. Each bevel gear (40,42) mounted around the input shaft (12) can be alternately coupled to and uncoupled from the input shaft via an associated pawl (80,90) disposed in a socket (72,74) in the input shaft and biased toward an operative position wherein such pawl (80,90) is extended into a single recess (50,58) in a bearing surface of such bevel gear. Paired pawls and paired recesses may be optionally employed where high torque is encountered. Oscillatory rotation of the input shaft (12) is limited to a range of approximately 180 DEG between two limiting positions defined by engagement of a stud (28), movable with a handle (26), against a pair of adjustable studs (30,32). Camming surfaces (100,102,110,112) on the pawls and the gears provide for movement of each pawl from its operative position. <IMAGE> |
