Patent ID: 7281457
Filing Date: 2007-10-16
Classification: B25B

Abstract:
1. A wrench comprising: a casing comprising a compartment; a rod rotatably received in the casing, the rod comprising an end adapted for coupling with a drive member for driving a fastener; an adjusting member mounted in the rod; and means for retaining the rod mounted between the adjusting member and the casing; wherein when a rotational force applied to the casing is smaller than an engaging force between the casing and said means for retaining the rod, the rod turns together with the casing for tightening the fastener; wherein when the rotational force applied to the casing is greater than the engaging force between the casing and said means for retaining the rod, the casing slides relative to the rod without turning the fastener; and wherein the adjusting member is adjustable in position relative to the casing to thereby change the engaging force between the casing and said means for retaining the rod, with the casing comprising a retaining section for engaging with said means for retaining the rod, with means for retaining the rod comprising an elastic element.