US3639074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbines
Assignee: CMW LAB Ltd
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Filing: 1970-05-18
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Granted: 1972-02-01
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Expires: 1990-05-18
Abstract
Abstract This invention provides a small high speed gas driven turbine of the gas-bearing type having a vent in the top plate of the casing surrounding the bearing to vent the upper bearing of the turbine, wherein the upper bearing chamber is additionally vented by one or more auxiliary vents in the casing and extending generally at right angles to the longitudinal axis of the rotor, the auxiliary vents suitably being spaced equidistantly around the circumference of the casing and from 0.005 to 0.05 inches in diameter. The invention also provides a dental handpiece having such a turbine.
Inventors
- 👤 Herbert Percy Killick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:37
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/18; F01D25/22; F16; F16C; F16C32/00; F16C32/06; F16C32/0629; F16C32/064; F16C32/0651; F16C32/0662; F16C32/067; F16C2300/00; F16C2300/10; F16C2300/12; F16C2316/00; F16C2316/10; F16C2316/13; Y; Y10; Y10S; Y10S415/00; Y10S415/904
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
181 words
A small, high speed, gas driven turbine, comprising: a turbine rotor having an axis about which said rotor rotates; a rotor casing, including a generally cylindrical opening within which said rotor is located; a rotor sleeve in said casing; said rotor passing through said sleeve so as to rotate with respect thereto; a bearing chamber between said rotor and said sleeve for being filled with air and for serving as an air bearing for said rotor; an air supply conduit communicating with said bearing chamber for supplying air thereto; an end cap having a main portion, which said main portion extends over an end of said cylindrical opening for closing off said opening; a main vent through said end cap main portion, which said main vent communicates with said bearing chamber; at least one auxiliary vent through said casing which said auxiliary vent communicates with said bearing chamber and is oriented so as to be substantially in a plane passing through and perpendicular to said rotor axis, whereby a blockage of said main vent will not interfere with said auxiliary vent.
Claim 2
Dependent Claim
181 words
A small, high speed, gas driven turbine, comprising: a turbine rotor having an axis about which said rotor rotates; a rotor casing, including a generally cylindrical opening within which said rotor is located; a rotor sleeve in said casing; said rotor passing through said sleeve so as to rotate with respect thereto; a bearing chamber between said rotor and said sleeve for being filled with air and for serving as an air bearing for said rotor; an air supply conduit communicating with said bearing chamber for supplying air thereto; an end cap having a main portion, which said main portion extends over an end of said cylindrical opening for closing off said opening; a main vent through said end cap main portion, which said main vent communicates with said bearing chamber; at least one auxiliary vent through said casing which said auxiliary vent communicates with said bearing chamber and is oriented so as to be substantially in a plane passing through and perpendicular to said rotor axis, whereby a blockage of said main vent will not interfere with said auxiliary vent.
Claim 3
Dependent Claim
35 words
A turbine as claimed in claim 1, having a plurality of said auxiliary vents, each being substantially in a respective said plane perpendicular to said rotor and all being equidistantly spaced apart around said casing.
Claim 4
Dependent Claim
20 words
A turbine as claimed in claim 1, in which the auxiliary vents are from 0.005 to 0.05 inches in diameter.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |