Device for fixing a dental drill into a rotor
US4012841A · kind A · utility
6Cited by
3References
4Claims
0Family size
Inventor
Key dates
| Filing date | Sep 23, 1975 |
| Grant date | Mar 22, 1977 |
| Priority date | — |
| Expiry date | Sep 23, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C1/141
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A holder for a dental drill is formed by a helical spring drivingly connected to a driven rotor. The normal internal diameter of the spring is slightly less than the diameter of the shank of the drill to be used. Axial insertion of the drill into one end of the spring causes the spring to compress in length and thus increase in diameter sufficiently to receive the drill shank and frictionally grip the same. Means are provided for expanding the spring to release the drill.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.