Device for locking a tool in a dental handpiece
US4234308A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1978 |
| Grant date | Nov 18, 1980 |
| Priority date | — |
| Expiry date | Apr 20, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B21/09
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
This device for locking a dental tool in a handpiece of the contra-angle type comprises a keeper plate slidably mounted on the external surface of the holder and rigidly associated with a control member formed with a thumb-piece consisting of an inclined surface portion thereof. A keyhole formed in the keeper plate is engaged by a suitable shaped end portion of the tool shank so that when the keeper plate is moved to its release position the tool shank can pass through the larger portion of the keyhole and when the plate is in its locking position to which it is urged by a return spring the end portion of the tool shank engages the narrow portion of the keyhole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.