| 摘要 |
A ratchet screw driver includes a housing, a pinion rotatably engaged in the housing, a sleeve rotatably engaged on the housing and engaged with the pinion in order to rotate the pinion, a shaft rotatably received in the housing, a notch formed in the shaft for receiving a pawl, a rod having a gear engaged with the pinion and having a projection for engaging with the pawl in order to rotate the pawl, the pawl is rotated when the rod is rotated by the sleeve via the pinion.
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