Patent ID: 6752050
Filing Date: 2004-06-22
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 central portion securely mounted to the rod to turn therewith, the retainer including at least two pairs of retaining sections on a side thereof; a casing comprising a receiving section for accommodating the retainer and allowing relative rotational movement between the casing and the retainer, the casing further comprising a compartment communicated with the receiving section; a pressing member received in the compartment of the casing and slidable along a longitudinal direction of the rod, the pressing member being turned together with the casing when the casing is turned; and means for biasing two ends of the pressing member to respectively engage with one pair of the retaining sections of the retainer, thereby exerting an engaging force between each of the ends of the pressing member and an associated one of the retaining sections of the retainer; 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 the rotational force applied to the casing is greater than the engaging force, the casing and the pressing member slide while the retainer and the rod are not turned.