Dental turbine
US4435161A · kind A · utility
Inventor
Key dates
| Filing date | Jun 10, 1982 |
| Grant date | Mar 6, 1984 |
| Priority date | — |
| Expiry date | Jun 10, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C1/16
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In a dental turbine, having a laterally displaceably arranged rotor assembly including a shaft mounted in upper and lower ball bearings and having its lower end protruding through a bore provided in the nose of the turbine and forming a gap or space with the bore for accommodating the lateral displacement of the shaft lower end thereat a protective sleeve (1) is fitted to the outer ring (2) of the lower ball bearing, and extends below the bearing, then along the lower end of the shaft (4) and into the space (5) formed between the shaft (4) and the bore (6) in the nose (7) of the turbine to provide a relatively minute gap or space between the inner surface of the lower portion of the sleeve and the lower end of the shaft and a resultant reduced size gap or space between the outer surface of the lower portion of the sleeve and the inner surface of the bore in the nose. The protective sleeve (1) which follows any lateral movement of the rotor assembly and a ring of soft material (13) received in compressed state between the outer surface of the lower portion of the sleeve and the inner surface (15) of the turbine head, i.e. rearwardly or upwardly of the bore in the nose, prevent waste…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.