US3765978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a low-friction fabric bearing
Assignee: Torrington Co Ltd
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Filing: 1971-07-08
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Granted: 1973-10-16
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Expires: 1991-07-08
Abstract
Abstract Improved wear and load-carrying properties result for a resinimpregnated fabric bearing wherein the bearing surface includes, as the most significant fabric component, a yarn which is a compounded bundle of sized TFE filaments and sized filaments of high-temperature nylon, in the proportion of at least no more than 50 percent TFE by volume. The yarn is loosely twisted, to the extent that after construction of a fabric with said yarn, the yarn is fully washable, to remove the sizing, down to the innermost filaments. This enables full impregnation of the fabric with synthetic resin, and curing in substantially intimate and continuous and void-free relation of the resin to all filaments within the yarn of the fabric.
Inventors
- 👤 Richard J Matt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:04
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C33/201; D; D02; D02G; D02G3/00; D02G3/44; D02G3/447; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249922; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2925; Y10T428/2933; Y10T428/2936; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2971; Y10T442/00; Y10T442/20; Y10T442/2008
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
12 words
The method of claim 1 in which the synthetic resin is FEP.
Claim 2
Dependent Claim
13 words
The method of claim 1, in which the synthetic resin is a phenolic.
Claim 3
Dependent Claim
13 words
The method of claim 1, in which the synthetic resin is an epoxy.
Claim 4
Dependent Claim
13 words
The method of claim 1, in which the synthetic resin is a polyimide.
Claim 5
Dependent Claim
45 words
The method of claim 1, in which the washing step is performed at a selected eleVated temperature in the range up to the boiling condition of the washing agent, whereby washing is accompanied by a controlled degree of fabric shrinkage prior to resin-impregnation and cure.
Claim 6
Dependent Claim
44 words
The method according to claim 1, in which a mold element is selected with a mold surface of said contour, to which said fabric side is applied for contour conformance, said mold surface being coated with a release agent prior to fabric application thereto.
Claim 7
Dependent Claim
11 words
The method of claim 1, wherein said filaments are substantially continuous.
Claim 8
Dependent Claim
23 words
The method of claim 1, wherein said yarn comprises a filament bundle twisted to an extent not substantially exceeding three twists per inch.
Claim 9
Dependent Claim
12 words
The method of claim 1, wherein said TFE filaments are etched filaments.
Claim 10
Dependent Claim
12 words
The method of claim 1, wherein said fabric is constructed by braiding.
Claim 11
Dependent Claim
12 words
The method of claim 1, wherein said fabric is constructed by knitting.
Claim 12
Dependent Claim
12 words
The method of claim 1, wherein said fabric is constructed by weaving.
Claim 13
Dependent Claim
29 words
The method of claim 1, in which the TFE filaments and high-temperature nylon filaments are in the proportion of at least no more than 50 percent TFE by volume.
Claim 14
Dependent Claim
26 words
The method of claim 14 in which the TFE filaments and high-temperature nylon filaments are in the proportion of 20 to 30 percent TFE by volume.
Claim 15
Independent Claim
113 words
The method of making a low-friction fabric bearing surface, which comprises selecting a loosely twisted yarn consisting of continuous TFE filaments and of continuous high-temperature nylon filaments, constructing a fabric with said yarn as the major component on at least one side, said fabric including a filamentary polyester as a component, preshrinking the fabric by heat-soaking the same under predetermined conditions of elevated temperature and time within substantially the manufacturer''s specified soak limits for the polyester, impregnating the fabric with an uncured synthetic resin selected for cure temperature within the predetermined elevated heat-soak temperature, conforming said one side to a desired bearing-surface contour, and curing the resin while the fabric is thus conformed.
Claim 16
Dependent Claim
28 words
The method of claim 16 in which said filaments are sized prior to fabric construction, and in which the fabric is washed in sizing-agent solvent prior to heat-soaking.
Claim 17
Independent Claim
97 words
The method of making a low-friction bearing fabric, which comprises selecting a loosely twisted yarn comprising sized TFE filaments and high-temperature nylon filaments as the most predominant components, constructing a fabric with said yarn as the major component on at least one side, and washing the fabric in sizing-agent solvent to remove sizing, whereby when said one side of said fabric is later embodied in a bearing surface potted with a synthetic resin, the resin is induced to flow into and throughout the cleaned and loose yarn bundles, for substantially intimate and continuous and void-free consolidation therewith.
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |