Automatic chuck for drill
US4203222A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 15, 1979 |
| Grant date | May 20, 1980 |
| Priority date | — |
| Expiry date | Jan 15, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T279/17752
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A surgical tool has a pneumatically driven rotor motor, a source of air under pressure to drive the motor, an output system for receiving rotation from the motor and transmitting it to a bur and a securing system for securing the bur to the output system. The securing system receives air pressure from the source of air and converts the pressure to a force acting on the bur to grip the bur. The motor has a shaft mounted for rotation in a housing, and the shaft is hollow so that some of the air directed into the motor goes through the shaft and into a chamber. A piston is mounted in the housing, and when air from the shaft is directed into the chamber, it moves the piston in the chamber. The piston is connected to a collet, so that introduction of air into the chamber moves the collet. The collet has an inclined surface, and there are grippers between the inclined surface and the bur. As the collet moves so that the narrower portion of the inclined surface contacts the grippers, the grippers are urged against the bur to secure it. The piston is connected to the collet by a connection allowing relative movement therebetween so that when the piston moves to its release position while s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.