US3864197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic bearing
Assignee: Individual
•
Filing: 1972-11-14
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Granted: 1975-02-04
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Expires: 1992-11-14
Abstract
Abstract A reinforced plastic bearing comprising a generally cylindrical structure of plastic reinforced with glass fiber, provided with a tubular layer of polytetrafluoroethylene fibers embedded and secured in the plastic. In the fabrication of this bearing, the polytetrafluoroethylene fibers are intertwined and formed into a cord having an irregular outer surface. The intertwining binds the fibers into position to inhibit relative motion thereof such that the cord is characterized by multiple length portions of the fibers in the outer cord surface, having opposite end portions anchored in position. This cord is formed into a woven fabric which becomes said tubular layer and which is impregnated with the aforesaid plastic in liquid form, the plastic flowing into the irregularities and interstices in the fabric and cord so as intimately to enrobe substantial portions of the cords and fibers, thereby securing them in position relative to each other. One surface of the fabric tubular layer has exposed the lubricous fibers which provide the bearing surface. Retention of the polytetrafluoroethylene fibers against delamination is, in one preferred method, maximized by use of a mandrel having a highly polished layer of polytetrafluoroethylene thereon. In removing the hardened bearing composite from the mandrel, the integrity of the plastic matrix which secures the polytetrafluoroethylene fibers in place is maintained.
Inventors
- 👤 Samuel M Shobert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:17
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C33/201; D; D03; D03D; D03D11/00; D03D25/00; F16C33/18; F16C2208/00; F16C2208/02; F16C2208/04; F16C2208/80; F16C2208/86; F16C2380/00; F16C2380/26; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/909; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1369; Y10T428/249921; Y10T428/249922
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
183 words
AN ARTICLE OF MANUFACTURE COMPRISING A LOW-FRICTION STRUCTURE AND A HARD BACKING THEREFOR, SAID HARD BACKING INCLUDING A PLASTIC MATERIAL, SAID LOW-FRICTION STRUCTURE HAVING A BEARING SURFACE COMPRISING ADJACENT CORDS OF STRANDS OF LOW COEFFICIENT OF FRICTION MATERIAL, EACH STRAND CONSISTING OF LOW COEFFICIENT OF FRICTION MATERIAL IN FIBER FORM AND SAID LOW COEFFICIENT OF FRICTION MATERIAL INCLUDING FLUOROCARBON RESIN, EACH CORD HAVING AN IRREGULAR OUTER SURFACE CONTAINING A PLURALITY OF RAISED AND DEPRESSED PORTIONS, SAID STRANDS IN EACH CORD BEING WOVEN TOGETHER FOR LOCATING SAID FIBERS IN PLACE IN RELATION TO EACH OTHER, SAID CORDS BEING INTERLACED TOGETHER IN A WOVEN FABRIC WHICH FURTHER ANCHORS SAID FIBERS AGAINST DISPLACEMENT, SAID CORDS AND FIBERS BEING SUBSTANTIALLY EMBEDDED IN SAID PLASTIC MATERIAL SUCH THAT THE LATTER MECHANICALLY SECURES SAID CORDS AND FIBERS IN POSITION, SAID FIBERS BEING UNDULATED THROUGHOUT THE LENGTH OF SAID CORDS WITH PORTIONS OF SAID FIBERS BEING EXPOSED THROUGH SAID PLASTIC MATERIAL TO DEFINE SAID BEARING SURFACE AND OTHER PORTIONS BEING FULLY EMBEDDED IN SAID PLASTIC MATERIAL, SAID PLASTIC MATERIAL NOT BEING CHEMICALLY OR ADHESIVELY BONDED TO SAID FIBERS OR CORDS.
Claim 2
Dependent Claim
183 words
AN ARTICLE OF MANUFACTURE COMPRISING A LOW-FRICTION STRUCTURE AND A HARD BACKING THEREFOR, SAID HARD BACKING INCLUDING A PLASTIC MATERIAL, SAID LOW-FRICTION STRUCTURE HAVING A BEARING SURFACE COMPRISING ADJACENT CORDS OF STRANDS OF LOW COEFFICIENT OF FRICTION MATERIAL, EACH STRAND CONSISTING OF LOW COEFFICIENT OF FRICTION MATERIAL IN FIBER FORM AND SAID LOW COEFFICIENT OF FRICTION MATERIAL INCLUDING FLUOROCARBON RESIN, EACH CORD HAVING AN IRREGULAR OUTER SURFACE CONTAINING A PLURALITY OF RAISED AND DEPRESSED PORTIONS, SAID STRANDS IN EACH CORD BEING WOVEN TOGETHER FOR LOCATING SAID FIBERS IN PLACE IN RELATION TO EACH OTHER, SAID CORDS BEING INTERLACED TOGETHER IN A WOVEN FABRIC WHICH FURTHER ANCHORS SAID FIBERS AGAINST DISPLACEMENT, SAID CORDS AND FIBERS BEING SUBSTANTIALLY EMBEDDED IN SAID PLASTIC MATERIAL SUCH THAT THE LATTER MECHANICALLY SECURES SAID CORDS AND FIBERS IN POSITION, SAID FIBERS BEING UNDULATED THROUGHOUT THE LENGTH OF SAID CORDS WITH PORTIONS OF SAID FIBERS BEING EXPOSED THROUGH SAID PLASTIC MATERIAL TO DEFINE SAID BEARING SURFACE AND OTHER PORTIONS BEING FULLY EMBEDDED IN SAID PLASTIC MATERIAL, SAID PLASTIC MATERIAL NOT BEING CHEMICALLY OR ADHESIVELY BONDED TO SAID FIBERS OR CORDS.
Claim 3
Dependent Claim
51 words
The article of claim 1 in which the strands of each cord are braided together, at least a portion of said fibers and cords having interstices therebetween which are substantially filled by said plastic material, said plastic material not being chemically or adhesively bonded to any of said fibers or cords.
Claim 4
Dependent Claim
83 words
The article of claim 2 in which said hard backing is of annular shape and having inner and outer peripheral surfaces, said low-friction structure also being annular and secured to one of said peripheral surfaces, said cords being braided into a seamless cylinder, one portion of said cords extending in the form of a helix in one circumferential direction alternately over and under another portion of cords, said cords being contiguous so as to provide a substantially continuous bearing surface of low-friction fibers.
Claim 5
Dependent Claim
20 words
The article of claim 2 in which said strands are twisted thereby further anchoring said fibers relative to each other.
Claim 6
Dependent Claim
19 words
The article of claim 1 in which each strand is of about 400 denier, and includes about 60 fibers.
Claim 7
Dependent Claim
35 words
The articles of claim 1 in which said hard backing is of annular shape and having inner and outer peripheral surfaces, said low-friction structure also being annular and secured to one of said peripheral surfaces.
Claim 8
Dependent Claim
13 words
The article of claim 6 in which said low friction material is polytetrafluoroethylene.
Claim 9
Dependent Claim
156 words
AN ARTICLE OR MANUFACTURE COMPRISING A LOW-FRICTION STRUCTURE AND A HARD BACKING OF FIBER REINFORCED PLASTIC THEREFOR, SAID LOW-FRICTION STRUCTURE HAVING A BEARING SURFACE COMPRISING ADJACENT CORDS OF STRANDS CONSISTING OF POLYTETRAFLUOROETHYLENE FIBERS, EACH CORD HAVING AN IRRECULAR OUTER SURFACE CONTAINING A PLURALITY OF RAISED AND DEPRESSED PORTIONS, SAID STRANDS IN EACH CORD BEING BRAIDED TOGETHER FOR LOCATING SAID FIBERS IN PLACE IN RELATION TO EACH OTHER, SAID CORDS BEING INTERLACED TOGETHER IN A WOVEN FABRIC WHICH FURTHER ANCHORS SAID FIBERS AGAINST DISPLACEMENT, SAID CORDS AND FIBERS BEING SUBSTANTIALLY EMBEDDED IN SAID PLASTIC MATERIAL SUCH THAT THE LATTER MECHANICALLY SECURES SAID CORDS AND FIBERS IN POSITION, SAID FIBERS BEING UNDULATED THROUGHOUT THE LENGTH OF SAID CORDS WITH PORTIONS OF SAID FIBERS BEING EXPOSED THROUGH SAID PLASTIC MATERIAL TO DEFINE SAID BEARING SURFACE AND OTHER PORTIONS BEING FULLY EMBEDDED IN SAID PLASTIC MATERIAL, SAID PLASTIC MATERIAL NOT BEING CHEMICALLY OR ADHESIVELY BONDED TO SAID FIBERS OR CORDS.
Claim 10
Dependent Claim
156 words
AN ARTICLE OR MANUFACTURE COMPRISING A LOW-FRICTION STRUCTURE AND A HARD BACKING OF FIBER REINFORCED PLASTIC THEREFOR, SAID LOW-FRICTION STRUCTURE HAVING A BEARING SURFACE COMPRISING ADJACENT CORDS OF STRANDS CONSISTING OF POLYTETRAFLUOROETHYLENE FIBERS, EACH CORD HAVING AN IRRECULAR OUTER SURFACE CONTAINING A PLURALITY OF RAISED AND DEPRESSED PORTIONS, SAID STRANDS IN EACH CORD BEING BRAIDED TOGETHER FOR LOCATING SAID FIBERS IN PLACE IN RELATION TO EACH OTHER, SAID CORDS BEING INTERLACED TOGETHER IN A WOVEN FABRIC WHICH FURTHER ANCHORS SAID FIBERS AGAINST DISPLACEMENT, SAID CORDS AND FIBERS BEING SUBSTANTIALLY EMBEDDED IN SAID PLASTIC MATERIAL SUCH THAT THE LATTER MECHANICALLY SECURES SAID CORDS AND FIBERS IN POSITION, SAID FIBERS BEING UNDULATED THROUGHOUT THE LENGTH OF SAID CORDS WITH PORTIONS OF SAID FIBERS BEING EXPOSED THROUGH SAID PLASTIC MATERIAL TO DEFINE SAID BEARING SURFACE AND OTHER PORTIONS BEING FULLY EMBEDDED IN SAID PLASTIC MATERIAL, SAID PLASTIC MATERIAL NOT BEING CHEMICALLY OR ADHESIVELY BONDED TO SAID FIBERS OR CORDS.
Claim 11
Dependent Claim
84 words
The article of claim 8 in which said hard backing is of annular shape and having inner and outer peripheral surfaces, said low-friction structure also being annular and secured to one of said peripheral surfaces, said cords being braided into a seamless cylinder, one portion of said cords extending in the form of a helix in one circumferential direction alternately over and under another portion of said cords, said cords being Contiguous so as to provide a substantially continuous bearing surface of low-friction fibers.
Claim 12
Dependent Claim
20 words
The article of claim 8 in which said strands are twisted thereby further anchoring said fibers relative to each other.
Claim 13
Dependent Claim
35 words
The article of claim 8 in which said hard backing is of annular shape and having inner and outer peripheral surfaces, said low-friction structure also being annular and secured to one of said peripheral surfaces.
References Cited (Backward Citations)
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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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |