| 摘要 |
<p>A wrench has a pair of jaws spaced to define an opening for a workpiece. A pair of plates, are mounted on the jaws for selective movement between first and second positions. In the first position, the plates are substantially immobile with respect to each other. In the second position, a first one of the plates is pivotable with respect to a second one of the plates. Thus, the wrench tightens (or loosens) the workpiece when rotated in the first direction, and slips over the workpiece in a "ratcheting" manner when rotated in the second, opposite direction. <IMAGE></p> |
