Patent US3598460A successfully refreshed from Google Patents.
US3598460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing with controlled friction
Assignee: Fedders Corp
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Filing: 1969-02-19
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Granted: 1971-08-10
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Expires: 1989-02-19
Abstract
Abstract A bearing surface is provided with a lining composed of polytetrafluoroethylene and a second lubricant material and the opposite bearing surface is provided with a roughened surface of controlled degree. On relative motion of the two surfaces, the polytetrafluoroethylene is transferred, at a controlled rate, to the roughened bearing surface to provide lubrication with a controlled degree of friction.
Inventors
- 👤 Richard Lee Conrath
- 👤 Clarence Melvin Overturf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:38
CPC Classifications
D; D06; D06F; D06F37/00; D06F37/20; D06F37/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
57 words
An improved bearing including a first surface in the form of a truncated hemisphere, said surface having a lining composed of polytetrafluoroethylene, and a second surface, having a hemispherical configuration mating with the first surface lining, and having a controlled degree of roughness, said second surface becoming coated with polytetrafluoroethylene upon relative motion of the two surfaces.
Claim 2
Dependent Claim
57 words
An improved bearing including a first surface in the form of a truncated hemisphere, said surface having a lining composed of polytetrafluoroethylene, and a second surface, having a hemispherical configuration mating with the first surface lining, and having a controlled degree of roughness, said second surface becoming coated with polytetrafluoroethylene upon relative motion of the two surfaces.
Claim 3
Dependent Claim
54 words
An improved bearing including a first surface with a lining composed of polytetrafluoroethylene and a resilient pad between said first surface and said polytetrafluoroethylene liner, and a second surface mating with the lining and having a controlled degree of roughness, said second surface becoming coated with polytetrafluoroethylene upon relative motion of the two surfaces.
Claim 4
Dependent Claim
54 words
An improved bearing including a first surface with a lining composed of polytetrafluoroethylene and a resilient pad between said first surface and said polytetrafluoroethylene liner, and a second surface mating with the lining and having a controlled degree of roughness, said second surface becoming coated with polytetrafluoroethylene upon relative motion of the two surfaces.
Claim 5
Dependent Claim
90 words
In a washing machine having an outer stationary tub, an inner tub capable of rotational movement, and a transmission with a drive shaft below said tubs, the improvement which comprises a hemispherical suspension bearing placed adjacent the base of said washer and supporting the weight of said inner and outer tubs, transmission, and drive shaft, the lower surface of said suspension, bearing being provided with a liner comprises of polytetrafluoroethylene, and the upper surface of said suspension bearing, adjacent said polytetrafluoroethylene liner, being provided with a surface of controlled roughness.
Claim 6
Dependent Claim
90 words
In a washing machine having an outer stationary tub, an inner tub capable of rotational movement, and a transmission with a drive shaft below said tubs, the improvement which comprises a hemispherical suspension bearing placed adjacent the base of said washer and supporting the weight of said inner and outer tubs, transmission, and drive shaft, the lower surface of said suspension, bearing being provided with a liner comprises of polytetrafluoroethylene, and the upper surface of said suspension bearing, adjacent said polytetrafluoroethylene liner, being provided with a surface of controlled roughness.
Claim 7
Dependent Claim
28 words
The washing machine of claim 3 wherein said polytetrafluoroethylene liner is composed of from 70 percent to 80 percent polytetrafluoroethylene and from 20 percent to 30 percent carbon.
Claim 8
Dependent Claim
35 words
The washing machine of claim 4 wherein said polytetrafluoroethylene liner is composed of from 74 percent to 76 percent polytetrafluoroethylene, 23 percent to 25 percent carbon, and approximately 1 percent of a compatible color identifier.
Claim 9
Dependent Claim
20 words
The washing machine of claim 3 wherein a resilient pad is placed between said first surface and said polytetrafluoroethylene liner.
Claim 10
Dependent Claim
37 words
The washing machine of claim 3 wherein said surface which mates with said polytetrafluoroethylene liner has a roughness of 250 + or - 50 root mean square and 328 + or - 15 peaks per linear inch.
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |