US3825982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making low friction bearings and bearings made therefrom
Assignee: SKF Compagnie dApplications Mecaniques SA
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Filing: 1973-01-12
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Granted: 1974-07-30
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Expires: 1993-01-12
Abstract
Abstract Bearing material comprises strip of cloth having upper surface of fluorocarbon resin threads and lower surface comprising metallic threads soldered to a metallic supporting strip. Fluorocarbon threads are embedded in a resin layer which is partially hardened before the material is cut and shaped, but completely hardened only after shaping has been completed.
Inventors
- 👤 Lacroix De Lavalette P De
- 👤 D Hein
- 👤 G Boudet
- 👤 A Jacquot
- 👤 J Nouveau
- 👤 J Charpentier
- 👤 A Bianunier
- 👤 A Blaiberg
- 👤 J Meyer
- 👤 A Neron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:26
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/14; B32B15/02; B32B5/00; B32B5/02; B32B5/022; B32B5/024; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C33/201; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/02; B32B2262/0253; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12444; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
81 words
Method as claimed in claim 1 in which the product having a low melting point is a thermosetting prepolymerized resin and said layer is subjected, before cutting and shaping, to a temperature insufficient to completely polymerize the resin but sufficient to produce a strong non-fragile layer having a thickness such that the anti-friction threads project therefrom, and that after the pieces are cut and shaped the resin layer is completely polymerized at a temperature below the melting point of the solder.
Claim 2
Dependent Claim
12 words
Method as claimed in claim 1 in which said product is paRaffin.
Claim 3
Dependent Claim
15 words
Method as claimed in claim 2 in which said thermo-setting resin is a phenolic resin.
Claim 4
Dependent Claim
15 words
Method as claimed in claim 2 in which the thermo-setting resin is a polyimide resin.
Claim 5
Dependent Claim
51 words
Method as claimed in claim 2 in which the temperature at which the resin layer is heated before forming is between 110*C and 150*C, the length of the treatment being between 1 minute and 15 minutes, so that the hardness of the resulting layer, before forming is less than 95 Shore.
Claim 6
Dependent Claim
51 words
Method as claimed in claim 2 in which the layer of prepolymerized resin is deposited by applying it in the liquid state, using a solution containing said prepolymerized thermo-setting resin in a solvent, the solvent being then eliminated by evaporation at a temperature less than the polymerization temperature of the resin.
Claim 7
Dependent Claim
44 words
Method as claimed in claim 2 in which the layer of prepolymerized resin is produced by electrostatically depositing a prepolymerized thermosetting resin in a pulverulent form and that said prepolymerized resin is then subjected to a temperature beneath the polymerization temperature of the resin.
Claim 8
Dependent Claim
30 words
Method as claimed in claim 2 in which the prepolymerized resin layer is applied in the form of a liquid at a temperature beneath the polymerization temperature of said resin.
Claim 9
Dependent Claim
98 words
Method as claimed in claim 1 in which the soldering step is continuously carried out while subjecting to a constant pressure and a temperature greater than that required to melt the solder but less than a temperature which will degrade the fluorocarbon threads, a continuous multi-layer strip formed by superposing a strip of thin material comprising the metallic threads and fluorocarbon threads, a strip of solder in contact with the metallic surface of said material, and a sheet of metal, said multi-layer strip being cooled before and after the soldering while maintaining it at the same constant pressure.
Claim 10
Dependent Claim
14 words
Method as claimed in claim 1 in which said thermoplastic fluorocarbon resin is polytetrafluoroethylene.
Claim 11
Dependent Claim
13 words
Method as claimed in claim 1 in which said metallic threads are copper.
Claim 12
Dependent Claim
14 words
Method as claimed in claim 1 in which said metallic threads are stainless steel.
Claim 13
Dependent Claim
147 words
A bearing material having a low coefficient of friction of the type comprising a friction surface made of a thin web comprising metallic threads and threads of a thermoplastic fluorocarbon resin, said threads being so interlaced so that one of the faces of the material consists principally of metallic threads while the other face consists essentially of fluorocarbon resin threads, and the metallic face being soldered to a metal sheet, which material has been cut and shaped after soldering and which is characterized by the fact that, after said soldering and before said cutting and shaping, a layer of a product having a low melting point capable of impregnating the web comprising threads of thermoplastic fluorocarbon resin was placed on said web in liquid form so as to produce a tough, non-fragile layer having a thickness such that the thermoplastic fluorocarbon resin threads project from said layer.
Claim 14
Dependent Claim
82 words
Bearing material as claimed in claim 14 in which the product having a low melting point is a thermosetting prepolymerized resin and said layer was subjected, before cutting and shaping, to a temperature insufficient to completely polymerize the resin but sufficient to produce a strong non-fragile layer having a thickness such that the anti-friction threads project therefrom, and that after the pieces were cut and shaped the resin layer was completely polymerized at a temperature below the melting point of the solder.
Claim 15
Dependent Claim
13 words
Bearing material as claimed in claim 14 in which said product is paraffin.
Claim 16
Dependent Claim
16 words
Bearing material as claimed in claim 15 in which said thermosetting resin is a phenolic resin.
Claim 17
Dependent Claim
16 words
Bearing material as claimed in claim 15 in which the thermosetting resin is a polyimide resin.
Claim 18
Dependent Claim
30 words
Bearing material as claimed in claim 14 in which the double-faced Web has a woven structure, the warp threads being exclusively polytetrafluoroethylene and the woof threads alternately metallic and polytetrafluoroethylene.
Claim 19
Dependent Claim
17 words
Bearing material as claimed in claim 14 in which the metallic threads of the web are copper.
Claim 20
Dependent Claim
18 words
Bearing material as claimed in claim 14 in which the metallic threads of the web are stainless steel.
References Cited (Backward Citations)
US3047934A
Cited
US3606657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |