Patent US4005915A successfully refreshed from Google Patents.
US4005915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plain bearing
Assignee: Wellington Machine Co
•
Filing: 1975-06-30
•
Granted: 1977-02-01
•
Expires: 1995-06-30
Abstract
Abstract A plain bearing and bearing-supported member of hardened steel for high load, low speed, use, especially suitable in wet environments and requiring little or no lubrication. Bearing surfaces are nitrided and steam tempered, and have a low friction, corrosion, and wear resistant oxide surface on a hardened case.
Inventors
- 👤 Earl H. Canfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:22
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; F16C13/00; F16C13/006; F16C2204/00; F16C2204/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A plain bearing assembly comprised of a steel bearing member and a steel rotatable member in sliding contact with the bearing member, said assembly constructed to operate at low speed and under heavy load with little or no lubrication, each said plain bearing member having a surface of revolution that slidingly engages a surface of revolution of the other for relative rotation, each said surface of revolution having an oxide surface layer on a nitrided case, said oxide layer of each member being formed by steam tempering said surfaces of revolution of the members subsequent to nitriding.
Claim 2
Dependent Claim
97 words
A plain bearing assembly comprised of a steel bearing member and a steel rotatable member in sliding contact with the bearing member, said assembly constructed to operate at low speed and under heavy load with little or no lubrication, each said plain bearing member having a surface of revolution that slidingly engages a surface of revolution of the other for relative rotation, each said surface of revolution having an oxide surface layer on a nitrided case, said oxide layer of each member being formed by steam tempering said surfaces of revolution of the members subsequent to nitriding.
Claim 3
Dependent Claim
64 words
A plain bearing comprising: inner and outer relatively sliding members, each of carbon alloy steel with a smooth surface finish on opposed relatively sliding surfaces; each having a strengthened case or layer adjacent said sliding surface, hardened and containing nitrides to a diffused depth of between 0.005 and 0.020 inch; and a brittle, corrosion-resistant, oxide, surface on the strengthened case, forming said sliding surfaces.
Claim 4
Dependent Claim
64 words
A plain bearing comprising: inner and outer relatively sliding members, each of carbon alloy steel with a smooth surface finish on opposed relatively sliding surfaces; each having a strengthened case or layer adjacent said sliding surface, hardened and containing nitrides to a diffused depth of between 0.005 and 0.020 inch; and a brittle, corrosion-resistant, oxide, surface on the strengthened case, forming said sliding surfaces.
Claim 5
Dependent Claim
65 words
A plain bearing comprising: a journal and journal bearing relatively rotatable, each of carbon alloy steel with a smooth surface finish on opposed relatively sliding surfaces; each having a strengthened case or layer adjacent said sliding surface, hardened and containing nitrides to a diffused depth of between 0.005 and 0.020 inch; and a brittle, corrosion-resistant, oxide, surface on the strengthened case, forming said sliding surfaces.
Claim 6
Dependent Claim
65 words
A plain bearing comprising: a journal and journal bearing relatively rotatable, each of carbon alloy steel with a smooth surface finish on opposed relatively sliding surfaces; each having a strengthened case or layer adjacent said sliding surface, hardened and containing nitrides to a diffused depth of between 0.005 and 0.020 inch; and a brittle, corrosion-resistant, oxide, surface on the strengthened case, forming said sliding surfaces.
References Cited (Backward Citations)
US977360A
Cited
US1329495A
Cited
US1475511A
Cited
US1882957A
Cited
US2403397A
Cited
US2573735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |