Bit retention and release mechanism
US4858939A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1988 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Jul 26, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T279/17794
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A mechanism is disclosed for selectively releasing or retaining a bit in a rotary power tool. The mechanism includes a tool housing having an interior bore. A spindle, mateable with the bit, is mounted within the bore. A tubular release sleeve is also mounted within the bore, and is slidable between a retention position and release position. A bushing is positioned within the bore between the sleeve and the housing, with its exterior surface contacting the bore. A retention key is mounted within the spindle. The key is adapted to cooperate with the release sleeve to extend into a circumferential groove in the bit when the sleeve is in the retention position, and move away from that groove when the sleeve is in the release position. A spring is used to bias the release sleeve into the retention position, and a pin is mounted on the tool housing to hold the bushing within the housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.