Patent US3698774A successfully refreshed from Google Patents.
US3698774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spindle assembly air bearings
Assignee: Alcatel CIT SA
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Filing: 1971-05-19
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Granted: 1972-10-17
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Expires: 1991-05-19
Abstract
Abstract A spindle assembly includes a sleeve bearing having a number of air nozzles equi-angularly arranged about a shaft. A thrust bearing supports one end of the shaft with clearances for air support. The air nozzles generally have a frusto-conical air passage with a central bore.
Inventors
- 👤 Claude Saulgeot
- 👤 Jean-Noel Coste
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:55
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/06; F16C32/0603; F16C32/0614; F16C32/0622; F04; F04D; F04D29/00; F04D29/04; F04D29/041; F04D29/0413; F16C35/00; F16C35/08; F16C35/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
A spindle assembly having a shaft on which workpieces are mounted comprises; a sleeve bearing surrounding the shaft and providing a predetermined clearance between them; first air nozzles for supplying pressurized air to the clearance are arranged equi-angularly in the sleeve bearing about the shaft; a circular distance piece; an abutment flange attached to the sleeve bearing by the circular distance piece; and thrust bearing means including a bearing flange, and second and third air nozzles for supplying pressurized air to the bearing flange, the air nozzles each have a generally frusto-conical air passage with a central substantially circular crosssectional bore communicating on its upstream side with a cup providing a convergent zone for the air supply.
Claim 2
Dependent Claim
117 words
A spindle assembly having a shaft on which workpieces are mounted comprises; a sleeve bearing surrounding the shaft and providing a predetermined clearance between them; first air nozzles for supplying pressurized air to the clearance are arranged equi-angularly in the sleeve bearing about the shaft; a circular distance piece; an abutment flange attached to the sleeve bearing by the circular distance piece; and thrust bearing means including a bearing flange, and second and third air nozzles for supplying pressurized air to the bearing flange, the air nozzles each have a generally frusto-conical air passage with a central substantially circular crosssectional bore communicating on its upstream side with a cup providing a convergent zone for the air supply.
Claim 3
Dependent Claim
14 words
An assembly as claimed in claim 1, in which the cup is substantially hemispherical.
Claim 4
Dependent Claim
27 words
An assembly as claimed in claim 1, in which the bore communicates on its downstream side with a further cup providing a divergent zone in the passage.
Claim 5
Dependent Claim
15 words
An assembly as claimed in clAim 3, in which the further cup is substantially hemispherical.
Claim 6
Dependent Claim
22 words
An assembly as claimed in claim 4, in which the cup has an axial length substantially equal to that of the bore.
Claim 7
Dependent Claim
37 words
An assembly as claimed in claim 5, further including a disc member, the bore of substantially circular cross-section and the cup being formed in the disc member which is disposed within the generally frusto-conical air nozzle passage.
Claim 8
Dependent Claim
17 words
An assembly as claimed in claim 6, in which the disc member is characterized by high hardness.
Claim 9
Dependent Claim
27 words
An assembly as claimed in claim 7, in which each of the air supply nozzles of the thrust bearing means is arranged to provide identical air flows.
Claim 10
Dependent Claim
27 words
An assembly as claimed in claim 8, in which the air nozzles of the sleeve bearing are arranged diametrically opposite each other and provide equal air flows.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |