Air motor
US5211531A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 26, 1991 |
| Grant date | May 18, 1993 |
| Priority date | — |
| Expiry date | Dec 26, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S415/904
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention is directed to a turbine type air motor adapted for use in a hand-piece for dental treatment and includes an air motor body supported by both ends of a turbine shaft with axle-bearings. The air motor includes an air charging passage for introducing compressed air from the rear end, an air discharging passage provided therein in parallel with the air charging passage, and a collet adapted to detachably load a cutting tool. Air flow in the air charging passage is directed to cool one axle-bearing and other air flow in the air discharging passage is directed to cool the other axle-bearing for locally cooling frictional heat generated in both axle-bearings by the high frequency of the air turbine rotation. The collet is devised to easily load the cutting tool by pushing a knock tube provided in the rear end of the hand-piece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.