US3972233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine meter bearing
Assignee: Badger Meter Inc
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Filing: 1974-09-09
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Granted: 1976-08-03
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Expires: 1994-09-09
Abstract
Abstract A turbine meter having a center support bearing structure including components with mating coaxial cylindrical bearing surfaces formed of fired ceramic materials, in which one of the bearing surfaces is formed of a high strength ceramic consisting of at least 99.9% alumina having a crystal size of less than about 6 microns, and has a surface finish of about 7 microinches or less.
Inventors
- 👤 Thomas E. Pelt
- 👤 Edward A. Seruga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:06
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/043; G; G01; G01F; G01F1/00; G01F1/05; G01F1/10; F16C2206/00; F16C2206/40; F16C2206/42; F16C2206/44
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
161 words
A turbine meter including a conduit housing, an impeller, means including a bearing assembly disposed in said conduit housing and rotatably supporting said impeller in said housing for rotary response of said impeller to flow of fluid in said housing, and means responsive to the rotation of said impeller for indicating the flow of such fluid through said housing, said bearing assembly including first and second members having mating coaxial cylindrical bearing surfaces, each of said members having at least a surface portion having a crystalline structure of a unified alumina ceramic material providing the respective cylindrical bearing surface, said surface portion of one of said members being at least 99.9% alumina and said bearing surface thereof having a surface finish of about 7 microinches or less, and said surface portion of the other of said members being formed of a lesser percentage of alumina and having a larger crystal size than said surface portion of said one of said members.
Claim 2
Dependent Claim
161 words
A turbine meter including a conduit housing, an impeller, means including a bearing assembly disposed in said conduit housing and rotatably supporting said impeller in said housing for rotary response of said impeller to flow of fluid in said housing, and means responsive to the rotation of said impeller for indicating the flow of such fluid through said housing, said bearing assembly including first and second members having mating coaxial cylindrical bearing surfaces, each of said members having at least a surface portion having a crystalline structure of a unified alumina ceramic material providing the respective cylindrical bearing surface, said surface portion of one of said members being at least 99.9% alumina and said bearing surface thereof having a surface finish of about 7 microinches or less, and said surface portion of the other of said members being formed of a lesser percentage of alumina and having a larger crystal size than said surface portion of said one of said members.
Claim 3
Dependent Claim
31 words
A turbine meter as in claim 1 wherein said ceramic material forming said surface portion of said one of said members comprises unified crystals less than about 6 microns in size.
Claim 4
Dependent Claim
19 words
A turbine meter as in claim 2 wherein said ceramic material has a hardness of 90 Rockwell or greater.
Claim 5
Dependent Claim
26 words
A turbine meter as in claim 1 wherein said first and second members have a diametral clearance therebetween within the range of 0.0015 to 0.005 inch.
Claim 6
Dependent Claim
25 words
A turbine meter as in claim 1 wherein said ceramic material forming said surface portion of said one of said members is about 99.98% alumina.
Claim 7
Dependent Claim
38 words
A turbine meter as in claim 5 wherein said ceramic material forming said surface portion of said one of said members comprises unified crystals less than about 6 microns in size and averaging about 3 microns in size.
Claim 8
Dependent Claim
41 words
A turbine meter as in claim 1 wherein said one of said members comprises a steel shaft and a ceramic bearing element encompassing said shaft and having an outer cylindrical surface forming said surface portion of said one of said members.
Claim 9
Dependent Claim
32 words
A turbine meter as in claim 7 wherein said ceramic bearing element is an elongated cylindrical element formed with a cylindrical socket therein which mates with an end portion of said shaft.
Claim 10
Dependent Claim
53 words
A turbine meter as in claim 8 wherein said ceramic bearing element is formed with a distal end portion at the end of said shaft and including a further unified ceramic bearing element mounted in said impeller for thrust-bearing engagement with said distal end portion of said ceramic bearing element on said shaft.
Claim 11
Dependent Claim
85 words
A turbine meter as in claim 1 wherein said bearing assembly includes a spindle shaft, said one of said bearing members being an elongated cylindrical element mounted on said shaft and including an outer end bearing surface, the other of said bearing members being an elongated member formed with an internal cylindrical bearing surface for mating with said cylindrical element and a further unified ceramic bearing element mounted in said impeller for thrust bearing engagement with said outer end bearing surface of said cylindrical element.
Claim 12
Dependent Claim
134 words
In a turbine meter having an impeller rotatably journaled on a bearing assembly in a conduit housing for rotary response of said impeller to the flow of fluid through said housing, the improvement wherein said bearing assembly includes first and second members having coaxial cylindrical bearing surfaces, each of said members having at least a surface portion having a crystalline structure of a unified ceramic material providing the respective cylindrical bearing surface, said surface portion of one of said members being at least 99.9% alumina and said bearing surface thereof having a surface finish of about 7 microinches or less, and said surface portion of the other of said members being formed of a lesser percentage of alumina and having a larger crystal size than said surface portion of said one of said members.
Claim 13
Dependent Claim
134 words
In a turbine meter having an impeller rotatably journaled on a bearing assembly in a conduit housing for rotary response of said impeller to the flow of fluid through said housing, the improvement wherein said bearing assembly includes first and second members having coaxial cylindrical bearing surfaces, each of said members having at least a surface portion having a crystalline structure of a unified ceramic material providing the respective cylindrical bearing surface, said surface portion of one of said members being at least 99.9% alumina and said bearing surface thereof having a surface finish of about 7 microinches or less, and said surface portion of the other of said members being formed of a lesser percentage of alumina and having a larger crystal size than said surface portion of said one of said members.
Claim 14
Dependent Claim
35 words
In a turbine meter as in claim 11, the further improvement wherein said ceramic material forming said surface portion of said one of said members comprises unified crystals less than about 6 microns in size.
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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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |