Screwdriver with torque setting mechanism
US7222559B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Aug 16, 2005 |
| Grant date | May 29, 2007 |
| Priority date | — |
| Expiry date | Nov 24, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B15/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A screwdriver comprises a torque setting mechanism including a torque adjustment ring, an actuation rod threadedly secured to the upper torque adjustment ring and a lower torque adjustment nut, a spring biased sleeve with the actuation rod passed, and a clutch ring snugly put on two opposing intermediate flats of the actuation rod and having an upper surface engaged the torque adjustment ring and a lower surface formed with recesses engaged with steel balls on an upper surface of a support ring in the sleeve. Turning a rotatable handle will turn the sleeve. The clutch ring will disengage with the steel balls if the torque exceeds a set value. Thus, the torque exerted on the handle will not transmit to a shank secured to the actuation rod so as to prevent a screw from being over-driven by the shank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.