| 摘要 |
A wrench includes a casing having a compartment, a rod rotatably received in the casing and having an end for coupling with a drive member for driving a fastener, an adjusting member mounted in the rod, and an elastic element for retaining the rod mounted between the adjusting member and the casing. When a rotational force applied to the casing is smaller than an engaging force between the casing and the elastic element, the rod turns together with the casing for tightening the fastener. When the rotational force applied to the casing is greater than the engaging force between the casing and the elastic element, the casing slides relative to the rod without turning the fastener. The adjusting member is adjustable in position relative to the casing to thereby change the engaging force between the casing and the elastic element.
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