US3934349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental handpiece or elbows for mounting dental treatment tools
Assignee: Kaltenbach and Voigt GmbH
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Filing: 1973-11-05
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Granted: 1976-01-27
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Expires: 1993-11-05
Abstract
Abstract A dental handpiece or elbow having a guide sleeve for mounting a dental treatment tool, in which the inner annular surface of the guide sleeve is coated with a wear-resistant coating so as to enhance the strength thereof against hammering and radial forces generated during use of the handpiece. In the case where the sleeve is connected to the tool through the intermediary of a collet, the latter is also provided with a similar coating in at least the regions in contact with the guide sleeve.
Inventors
- 👤 Eugen Eibofner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:40
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/08; A61C1/14; A61C1/141
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
In a dental handpiece having a headpiece; a guide sleeve formed of hard metal; and means rotatably supporting said guide sleeve within said headpiece, said guide sleeve being adapted to support the shank of a dental treatment tool interiorly thereof, the improvement comprising; a coating formed essentially of chromium and metal carbide being provided on at least the annular inner wall surface of the guide sleeve, said coating having a hardness of at least 1800 Vickers hardness at a test load of 0.2
Claim 2
Dependent Claim
83 words
In a dental handpiece having a headpiece; a guide sleeve formed of hard metal; and means rotatably supporting said guide sleeve within said headpiece, said guide sleeve being adapted to support the shank of a dental treatment tool interiorly thereof, the improvement comprising; a coating formed essentially of chromium and metal carbide being provided on at least the annular inner wall surface of the guide sleeve, said coating having a hardness of at least 1800 Vickers hardness at a test load of 0.2
Claim 3
Dependent Claim
13 words
An improvement as claimed in claim 1, said coating having a thickness of
Claim 4
Dependent Claim
13 words
An improvement as claimed in claim 1, said coating being smoothed to a
Claim 5
Dependent Claim
28 words
An improvement as claimed in claim 1, said guide sleeve being formed of a hardened metal having a hardness in the range of 40 to 58 Rockwell C.
References Cited (Backward Citations)
US1920934A
Cited
US3787977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |