Wrench with a fixed maximum operational torque
OwnerBobby Huinventor
Life of this patent
Estimating the term…
Abstract
A wrench comprises a rod, a retainer, a pressing member, and a casing for accommodating the retainer and allowing relative pivotal movement between the casing and the retainer. The pressing member is received in the casing and slidable along a longitudinal direction of the rod. The pressing member is biased to press against two ends of the retainer, thereby exerting an engaging force between each of two ends of the retainer and an associated one of the ends of the pressing member. 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. When a 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.
Claims27
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 and two ends;
- a casing comprising a receiving section for accommodating the retainer and allowing relative pivotal 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;
- means for biasing two ends of the pressing member to respectively engage with the ends of the retainer, thereby exerting an engaging force between each of the ends of the retainer and an associated one of ends of the pressing 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 and the pressing member slide while the retainer and the rod are not turned.
Dependencies are inferred from the claim text.