US3934686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon friction members having torque transmitting formations
Assignee: Dunlop Ltd
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Filing: 1973-12-18
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Granted: 1976-01-27
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Expires: 1993-12-18
Abstract
Abstract A carbon brake disc has its torque transmitting formations (keyways or keys) reinforced by filament reinforced carbon inserts which are preferably located, and may be bonded, in cut-out areas of the disc periphery. The formations are formed by a separate series of operations from those used to form the remainder of the friction members such as by application of a filimentary reinforcement of carbonized cloth, textile tape, random textile fibers or boron fibers.
Inventors
- 👤 Ian Leonard Stimson
- 👤 Frederick Sidney Dowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:47
CPC Classifications
F; F16; F16D; F16D13/00; F16D13/58; F16D13/60; F16D13/64; F16D13/648; F16D65/00; F16D65/02; F16D65/12; F16D65/125; F16D65/126
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A carbon frictional member for a brake or clutch comprising an annular carbon disc one periphery of which is provided with a number of discrete circumferentially-separated carbon torque-transmitting formations reinforced by filamentary material, the formations being formed by a separate sequence of operations from those used to form the remainder of the friction member and recessed into the periphery so that the disc surrounds the inserts on all but their radially outer faces.
Claim 2
Dependent Claim
73 words
A carbon frictional member for a brake or clutch comprising an annular carbon disc one periphery of which is provided with a number of discrete circumferentially-separated carbon torque-transmitting formations reinforced by filamentary material, the formations being formed by a separate sequence of operations from those used to form the remainder of the friction member and recessed into the periphery so that the disc surrounds the inserts on all but their radially outer faces.
Claim 3
Dependent Claim
21 words
A member as claimed in claim 1, wherein the filamentary reinforcement of the torque-transmitting formations takes the form of carbonized cloth.
Claim 4
Dependent Claim
22 words
A member as claimed in claim 1, wherein the filamentary reinforcement of the torque-transmitting formations takes the form of carbonized textile tape.
Claim 5
Dependent Claim
23 words
A member as claimed in claim 1, wherein the filamentary reinforcement of the torque-transmitting formations takes the form of carbonized random textile fibers.
Claim 6
Dependent Claim
22 words
A member as claimed in claim 1, wherein the filamentary reinforcement of the torque-transmitting formations takes the form of carbonized boron fibers.
Claim 7
Dependent Claim
29 words
A member as claimed in claim 1 wherein the disc is formed from material comprising a matrix of carbon and a filamentary reinforcement in the form of carbonized felt.
Claim 8
Dependent Claim
34 words
A member as claimed in claim 6 wherein each torque-transmitting formation takes the form of an insert positioned in and substantially filling a respective cut-out provided in one of the peripheries of the disc.
Claim 9
Dependent Claim
24 words
A member as claimed in claim 7 wherein each cut-out and the associated insert are in mutual contact at surfaces comprising large radius curves.
Claim 10
Dependent Claim
23 words
A member as claimed in claim 8 wherein a tongue-and-groove joint is formed between each insert and the associated cut-out of the disc.
Claim 11
Dependent Claim
33 words
A member as claimed in claim 1 wherein the disc is formed from material comprising a matrix of carbon and a filamentary reinforcement in the form of a circumferential winding of textile tape.
References Cited (Backward Citations)
FR1134959A
Cited
US3552533A
Cited
US3639197A
Cited
US3738457A
Cited
DE2006540A1
Cited
US3712428A
Cited
US3731769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |