Patent US4394275A successfully refreshed from Google Patents.
US4394275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite material for sliding surface bearings
Assignee: Karl Schmidt GmbH
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Filing: 1981-07-15
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Granted: 1983-07-19
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Expires: 2001-07-15
Abstract
Abstract A composite material for sliding surface bearings comprises a gacking shell of steel, which is covered by a bearing metal layer of sintered porour bronze having a porosity of 25 to 45%. The voids of the bronze layer are filled with a fluorocarbon-lead mixture. The bearing metal layer is covered by an anti-friction layer consisting of the fluorocarbon-lead mixture in a thickness of, for example, 30 to 500 microns. To permit of a machining of the anti-friction layer the bronze layer has a thickness of 250 to 350 microns and a porosity of 25 to 45% and the fluorocarbon-lead mixture comprises 30 to 60% by weight polyvinylidene fluorinde and 20 to 50% by weight lead.
Inventors
- 👤 Wolfgang Bickle
- 👤 Rolf Funke
- 👤 Rolf Pfoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:55
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/106; B; B32; B32B; B32B15/00; B32B15/18; B32B15/04; B32B15/08; F16C33/20; F16C33/201; B32B2270/00; B32B2305/00; B32B2305/02; B32B2305/026; B32B2305/80; B32B2311/00; B32B2311/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A composite material for a sliding surface bearing comprising a supporting shell of steel, which is covered by a bearing metal layer comprising sintered porous bronze having a porosity of 25 to 45%, the voids of which are filled with a fluorocarbon-lead mixture comprising 30 to 60% by weight polyvinylidene fluoride and 20 to 50% by weight lead, said bearing metal layer in turn covered by an anti-friction layer comprising 30 to 60% by weight polyvinylidene fluoride and 20 to 50% by weight lead, said anti-friction layer having pockets or grooves therein containing a lubricant.
Claim 2
Dependent Claim
95 words
A composite material for a sliding surface bearing comprising a supporting shell of steel, which is covered by a bearing metal layer comprising sintered porous bronze having a porosity of 25 to 45%, the voids of which are filled with a fluorocarbon-lead mixture comprising 30 to 60% by weight polyvinylidene fluoride and 20 to 50% by weight lead, said bearing metal layer in turn covered by an anti-friction layer comprising 30 to 60% by weight polyvinylidene fluoride and 20 to 50% by weight lead, said anti-friction layer having pockets or grooves therein containing a lubricant.
Claim 3
Dependent Claim
24 words
A composite material according to claim 1 wherein the covering layer of polyvinylidene fluoride and lead has a thickness of 30 to 500 microns.
Claim 4
Dependent Claim
20 words
A composite material according to claim 2 wherein said bearing metal layer has a thickness of 250 to 350 microns.
Claim 5
Dependent Claim
19 words
A composite material according to claim 3 wherein said fluoro-carbon-lead mixture additionally contains 5 to 30% by weight polytetrafluoroethylene.
Claim 6
Dependent Claim
28 words
A composite material according to claim 4 wherein the fluoro-carbon-lead mixture filling said voids comprises at least 50% by weight of polyvinylidene fluoride and 40% be weight lead.
Claim 7
Dependent Claim
28 words
A composite material according to claim 5 wherein the fluorocarbon-lead mixture of said covering layer comprises at least 50% be weight polyvinylidene fluoride and 40% by weight lead.
Claim 8
Dependent Claim
37 words
A composite material according to claim 3, wherein the fluorocarbon-lead mixture of said covering material and the fluorocarbon-lead mixture filling said voids, comprises 38% by weight polyvinylidene fluoride, 14% by weight polytetrafluoroethylene and 38% by weight lead.
Claim 9
Dependent Claim
10 words
A bearing made of the composite material of claim 3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |