Wrench with a fixed maximum operational torque
US6701813B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 7, 2002 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Mar 23, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/1427
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.