Method and apparatus for providing torque limit feedback in a power drill
US7400106B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2006 |
| Grant date | Jul 15, 2008 |
| Priority date | — |
| Expiry date | Jan 16, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/937
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A battery-powered tool indicates to an operator that a torque limit has been reached. The tool comprises a driver circuit for generating motor interface driving signals, a motor interface circuit coupled to a motor to selectively couple power to the motor in accordance with the motor driving signals, a torque limit signal generator for generating a torque limit signal, a motor torque signal generator for generating a torque signal corresponding to a torque generated by the motor, and a microcontroller for comparing the motor torque signal to the torque limit signal and for generating a torque limit indicating signal in response to the torque signal being equal to or greater than the torque limit signal so the driver circuit operates the motor to vibrate to alert an operator that the torque limit has been reached.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.