Patent US4419190A successfully refreshed from Google Patents.
Patent US4198754A successfully refreshed from Google Patents.
US4198754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental turbine spindle assembly
Assignee: Bank of America Corp
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Filing: 1978-09-26
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Granted: 1980-04-22
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Expires: 1998-09-26
Abstract
Abstract A dental turbine spindle assembly has a housing in which a pair of bearing supports are disposed concentric with an axis. A pair of bearings are disposed on the supports. A hollow spindle concentric with the axis is carried in a portion of the bearings and at one end projects through an opening in the housing. The projecting portion of the spindle is conical, is split and is threaded. A nut on the projecting portion is conical and is threaded to engage the spindle and has a circular portion partly disposed within a portion of a bearing. There is a wrench-receiving contour at the other end of the spindle accessible through an aperture in the housing.
Inventors
- 👤 Joseph P. Lares
- 👤 Albert J. Lares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:09
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/08; A61C1/18; A61C1/181; A61C1/02; A61C1/05; A61C1/14; A61C1/141
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
169 words
A dental turbine spindle assembly comprising a housing having an opening therein; means forming elastomeric bearing supports in said housing; bearings in said housing supported entirely on said bearing supports concentric with and spaced apart along an axis; a hollow cylindrical spindle portion in said housing directly engaging only a portion of the interior axial length of said bearings, extending along said axis and having an externally threaded end portion of reduced diameter projecting through said opening; a turbine runner directly mounted on said spindle between said bearings; axially extending slits in said end portion of said spindle dividing said end portion of said spindle into separate jaws directly engageable with a dental tool within said spindle; and an internally threaded nut partially within said housing and partially projecting through said opening and threadedly engaging said jaws, said hollow cylindrical spindle portion extending into only a portion of each of said bearings and a circular portion of said nut extending into a remaining portion of one of said bearings.
Claim 2
Dependent Claim
169 words
A dental turbine spindle assembly comprising a housing having an opening therein; means forming elastomeric bearing supports in said housing; bearings in said housing supported entirely on said bearing supports concentric with and spaced apart along an axis; a hollow cylindrical spindle portion in said housing directly engaging only a portion of the interior axial length of said bearings, extending along said axis and having an externally threaded end portion of reduced diameter projecting through said opening; a turbine runner directly mounted on said spindle between said bearings; axially extending slits in said end portion of said spindle dividing said end portion of said spindle into separate jaws directly engageable with a dental tool within said spindle; and an internally threaded nut partially within said housing and partially projecting through said opening and threadedly engaging said jaws, said hollow cylindrical spindle portion extending into only a portion of each of said bearings and a circular portion of said nut extending into a remaining portion of one of said bearings.
Claim 3
Dependent Claim
30 words
A dental turbine spindle as defined in claim 1 wherein said jaws are externally threaded, the threads thereof and the internal threads of said nut extending along an imaginary cone.
References Cited (Backward Citations)
GB643140A
Cited
US3324553A
Cited
US3400459A
Cited
US3325899A
Cited
US3731384A
Cited
US3893242A
Cited
US3871097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |