Device for actuating a tool fastening and releasing mechanism
US4773856A · kind A · utility
Inventor
Key dates
| Filing date | May 19, 1987 |
| Grant date | Sep 27, 1988 |
| Priority date | — |
| Expiry date | May 19, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C1/141
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A device for releasing a tool from a tool fastening mechanism of a dentist's handpiece comprises a push-piece that is held in an outer, inoperative position by a spring, and a slide mounted on a rotor of the dentist's handpiece. Upon being pressed, the push-piece engages the slide to release a tool fastened in the rotor. In order to prevent the push-piece from overheating when it is in contact with the slide while the slide is rotating at high speed, the push-piece carries a disc and the slide carries a ball. The disc and the ball are for instance made of sintered hard metal and are located where the push-piece and the slide engage such as to have substantially a point contact between them on the rotational axis of the slide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.