Transmission for power tool with variable speed ratio
US8887831B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2011 |
| Grant date | Nov 18, 2014 |
| Priority date | — |
| Expiry date | Sep 27, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19884
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A power tool includes a housing, a motor contained in the housing, an output shaft extending proximate a front of the housing, an end effector coupled to the output shaft and configured to hold an accessory; and a transmission disposed in the housing between the motor and the output shaft. The transmission includes a variable ratio gear set configured to transmit power from the motor to the output shaft at a substantially variable speed ratio. The transmission may further include a constant ratio gear set configured to transmit power from the motor at a substantially constant speed ratio. The transmission may be automatically or manually shiftable between a first mode where it transmits power through the constant speed ratio gear set and a second mode where it transmits power through the variable speed ratio gear set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.