Patent ID: 6766718
Filing Date: 2004-07-27
Classification: B25B

Abstract:
A wrench comprising:a rod comprising a driving portion on an end thereof for engaging with a fastener; a retainer having a first end securely mounted to the rod to turn therewith and a second end; a casing fir accommodating the retainer and allowing relative pivotal movement between the casing and the retainer; an engaging member mounted in the casing; and means for biasing the engaging member to engage with the second end of the retainer, thereby exerting an engaging force between the second end of the retainer and the engaging member; wherein when a rotational force applied to the casing is smaller than the engaging force, the retainer and the rod are turned to thereby turn the fastener; and wherein when a rotational force applied to the casing is greater than the engaging force, the casing slides while the retainer and the rod are not turned.