| 摘要 |
An improved ratchet construction for a powered wrench of the type which includes an oscillating power unit adapted to provide torque to a socket assembly during each forward stroke, and a ratchet mechanism which permits the drive mechanism to return to its initial position at the completion of each stroke without applying a reverse torque to the select assembly is presented. The improved ratchet construction acts to synchronize the coupling elements (i.e., the pins) so that the correct number of pins will (1) be seated in their recesses at the same time; and (2) the pins will wait until a "throat" is properly opened before dropping into their respective recesses (thus preventing a pin from partially seating and making a "click" sound which might signal the operator to apply the power stroke). In this way the correct number of pins will be completely seated in its recess when the operator attempts the power stroke.
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