| 摘要 |
A ratchetlike tool in which there are three operable positions. The tool functions by means of rollers which become wedged or cammed between a retaining means and a hub to force a bearing surface of the hub into frictional engagement with a stationary portion of the wrench. The retaining means include a plurality of pairs of intersecting inclined surfaces upon which are positioned the rollers and a spring means to separate the rollers. A separator cooperating with the pairs of rollers is adaptable to move the rollers along the inclined planes to cause the camming relationship. When the separator is in its middle position, the hub does not move in either direction and movement of the separator into either of its other two positions frees one of the rollers from its cammed position to permit rotation in the opposite direction.
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