US3787977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental handpiece of straight or angle type
Assignee: Kaltenbach and Voigt GmbH
•
Filing: 1971-03-25
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Granted: 1974-01-29
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Expires: 1991-03-25
Abstract
Abstract A bearing in a dental handpiece comprises a thin inner sleeve press-fitted in a thicker outer sleeve. The outer sleeve is porous and the inner sleeve impermeable, the inner sleeve having an axial groove with radial apertures leading from the groove to the outer surface of the inner sleeve to serve as channels for flow of lubricant from the outer sleeve to the inner surface of the inner sleeve.
Inventors
- 👤 G Farian
- 👤 W Fink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:06
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/08; A61C1/18; A61C1/181
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A dental handpiece comprising a high speed rotational shaft, and a plain bearing with lubricant circulation for said shaft, said bearing comprising two concentric sleeves securely connected to one another in tight fitting relation, the outer sleeve having a greater wall thickness than the inner sleeve, the outer sleeve being porous and supplied with lubricant to form a reservoir thereof, the inner sleeve being impervious to said lubricant and having a smooth inner surface in which the shaft rotates, the inner sleeve being provided with at least one inner axial groove and radial apertures extending from said groove and opening at the exterior of the inner sleeve to face the inner surface of the outer sleeve to conduct lubricant to the groove via said apertures, whereby the lubricant is supplied between the shaft and the inner surface of the inner sleeve.
Claim 2
Dependent Claim
141 words
A dental handpiece comprising a high speed rotational shaft, and a plain bearing with lubricant circulation for said shaft, said bearing comprising two concentric sleeves securely connected to one another in tight fitting relation, the outer sleeve having a greater wall thickness than the inner sleeve, the outer sleeve being porous and supplied with lubricant to form a reservoir thereof, the inner sleeve being impervious to said lubricant and having a smooth inner surface in which the shaft rotates, the inner sleeve being provided with at least one inner axial groove and radial apertures extending from said groove and opening at the exterior of the inner sleeve to face the inner surface of the outer sleeve to conduct lubricant to the groove via said apertures, whereby the lubricant is supplied between the shaft and the inner surface of the inner sleeve.
Claim 3
Dependent Claim
16 words
A handpiece as claimed in claim 1 wherein said sleeves are cylindrical and coextensive in length.
Claim 4
Dependent Claim
20 words
A handpiece as claimed in claim 2 wherein the apertures extend in uniform spaced axial arrangement along the inner sleeve.
Claim 5
Dependent Claim
62 words
A handpiece as claimed in claim 1 comprising an elbow, an angled portion extending from said elbow and having a free end and a head on said free end of the angled portion, said shaft being disposed in said angled portion and having opposite ends, one of said bearings supporting said shaft at each of the ends thereof in said angled portion.
Claim 6
Dependent Claim
16 words
A handpiece as claimed in claim 4 comprising a toothed wheel on each of said shaft.
Claim 7
Dependent Claim
17 words
A handpiece as claimed in claim 1 wherein said outer sleeve is constituted of sintered metal. 1
Claim 8
Dependent Claim
15 words
A handpiece as claimed in claim 6 wherein the inner sleeve is a copper-beryllium alloy.
Claim 9
Dependent Claim
18 words
A handpiece as claimed in claim 7 wherein the inner sleeve is press fit in said outer sleeve.
Claim 10
Dependent Claim
13 words
A handpiece as claimed in claim 8 wherein said inner sleeve is drawn.
Claim 11
Dependent Claim
13 words
A handpiece as claimed in claim 8 wherein said inner sleeve is rolled.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |