| 摘要 |
A hand tool may be constructed with one or more longitudinally reciprocating serrated inserts held by a pair of oppositely facing jaws forming an arc, with a first of the jaws defining an arcuate greater section of the arc and containing a first passage opening into the arc to expose a plurality of lands separated by intervening teeth of a movable ratcheting element, and a second of the jaws containing an arcuate lesser section of the arc and being perforated by a second passage opening into said arc to expose a plurality of lands separated by intervening teeth of an opposing ratcheting element, in a plurality of cooperating alignments with the lands and teeth of the movable element. The two ratcheting elements are disposed with the arc between the jaws to directly engage, in cooperation with individual lands of said opposing element, diametrically opposite features of a rotatable element, in a succession of grasps equally amenable to both non-ratchetable and ratchetable movement of said hand tool relative to the rotatable element.
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