Power tools with operating speed control circuit
US6518719B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2000 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Oct 20, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B49/10
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A variable speed power tool may include a speed adjusting device and/or a maximum speed adjusting device for adjusting the operating speed, and a fixed operating speed switch. An operator adjustable speed adjusting device having a position maintaining mechanism also may be utilized. When manipulated by the operator, the fixed operating speed switch gives priority to the adjusted position of the speed adjusting device and adjusts the operating speed to a preset operating speed. In the alternative, a switching device and an internal integrated circuit may be utilized to adjust the operating speed to a target speed using feedback control. The switching device preferably selects a voltage corresponding to the target speed from either a voltage representative of the position of the speed adjusting device or a predetermined voltage representative of the present operating speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.