| 摘要 |
A ratchet drive tool includes ratchet head that has a cylindrical aperture and a drive member rotatably mounted in the aperture. The drive member has a drive shaft that projects axially outwardly of the aperture and a pawl support structure oppositely positioned from the drive shaft. The pawl support structure has a flat slide surface oriented in a slide plane parallel to the rotational axis of the drive member. A pawl member has flat surface portions constrained for sliding movement along the slide surface between left and right drive positions wherein left and right ratchet teeth on the pawl member respectively engage longitudinal ratchet teeth on the inner surface of the aperture. The pawl member is radially biased into the selected drive position in relation to the rotational axis by a spring and pin member, and a switch operates to move the pawl member between the left and right drive positions. In an alternate form, two pawl members respectively slide on parallel slide surfaces.
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