| 摘要 |
A power tool includes a housing rotatably secured to a seat and having an internal gear and having a bore for rotatably receiving a driving shaft. A motor is secured to the seat and includes a spindle having a pinion engaged with the internal gear for driving the housing to rotate relative to the seat. A pawl is rotatably secured in the housing, and has two ends selectively engaged with the shaft to rotate the shaft in either direction when the housing is rotated relative to the seat by the motor with a speed greater enough to cause the pawl to engage with the shaft.
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