US4178278A
Expired / Lapsed
US
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Friction material for railroad service
Assignee: Johns Manville Corp
•
Filing: 1978-06-26
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Granted: 1979-12-11
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Expires: 1998-06-26
Abstract
Abstract A friction material composition is described which is suitable for a wide variety of railroad brake services, particularly AAR (Association of American Railroads) service. In other embodiments the composition may also be used for heavy duty service, such as on locomotives, or as a disc brake material. The composition comprises, in percent by volume: ______________________________________ organic component 30-60% steel fibers 1-12% carbonaceous component 5-30% inorganic fillers 5-35% additives 1-7% ______________________________________ The composition may also contain up to 15 volume percent of friction modifiers an/or up to 20 volume percent of cashew nut shell resin particles. In addition, it contains no lead metal or lead compounds and no asbestos fiber.
Inventors
- 👤 Harold J. Reynolds, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:28
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/06
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
69 words
A friction material composition suitable for use as a brake shoe for railroad service (a) which comprises, in percent by volume: ______________________________________
organic component 30-60%
steel fibers 1-12%
carbonaceous component
5-30%
inorganic fillers 5-35%
additives 1-7%
______________________________________ (b) which also contains no lead metal, lead compounds or asbestos fiber; and (c) wherein said organic component comprises rubber in an amount of at least 20% by volume of the composition.
Claim 2
Dependent Claim
69 words
A friction material composition suitable for use as a brake shoe for railroad service (a) which comprises, in percent by volume: ______________________________________
organic component 30-60%
steel fibers 1-12%
carbonaceous component
5-30%
inorganic fillers 5-35%
additives 1-7%
______________________________________ (b) which also contains no lead metal, lead compounds or asbestos fiber; and (c) wherein said organic component comprises rubber in an amount of at least 20% by volume of the composition.
Claim 3
Dependent Claim
19 words
A friction material composition as in claim 1 further comprising up to 15 percent by volume of friction modifiers.
Claim 4
Dependent Claim
24 words
A friction material composition as in claim 1 or 2 further comprising up to 20 percent by volume of cashew nut shell resin particles.
Claim 5
Dependent Claim
26 words
A friction material composition as in claim 1 wherein said steel fibers have diameters within the range designated as Grade No. 0 to Grade No. 3.
Claim 6
Dependent Claim
25 words
A friction material composition as in claim 4 wherein said steel fibers have lengths within the range of from about 1/32 to about 3/16 inch.
Claim 7
Dependent Claim
21 words
A friction material composition as in claim 1 wherein said organic component is present as 34 to 53 percent by volume.
Claim 8
Dependent Claim
21 words
A friction material composition as in claim 1 wherein said steel fibers are present as 1 to 9 percent by volume.
Claim 9
Dependent Claim
21 words
A friction material composition as in claim 1 wherein said carbonaceous component is present as 16 to 25 percent by volume.
Claim 10
Dependent Claim
21 words
A friction material composition as in claim 1 wherein said inorganic fillers are present as 15 to 30 percent by volume.
Claim 11
Dependent Claim
20 words
A friction material composition as in claim 1 wherein said organic component comprises a mixture of rubber and phenolic resin.
Claim 12
Dependent Claim
17 words
A friction material composition as in claim 10 wherein the rubber:resin volumetric ratio is at least 5.3:1.
Claim 13
Dependent Claim
17 words
A friction material composition as in claim 11 wherein said rubber:resin volumetric ratio is at least 10:1.
Claim 14
Dependent Claim
26 words
A friction material composition as in claim 1 wherein said rubber in said organic component is present as at least 35% by volume of the composition.
Claim 15
Dependent Claim
62 words
A friction material composition as in claim 1 (a) comprising in percent by volume: ______________________________________
organic component 34-53%
steel fibers 1-9%
carbonaceous component 16-25%
inorganic fillers 15-30%
additives 2-4%
______________________________________ (b) which also contains no lead metal, lead compounds or asbestos fiber; and (c) wherein said organic component comprises rubber in an amount of at least 20% by volume of the composition.
Claim 16
Dependent Claim
19 words
A friction material composition as in claim 14 further comprising 2 to 10 percent by volume of friction modifiers.
Claim 17
Dependent Claim
24 words
A friction material composition as in claim 14 or 15 further comprising 2 to 8 percent by volume of cashew nut shell resin particles.
Claim 18
Dependent Claim
26 words
A friction material composition as in claim 14 wherein said steel fibers have diameters within the range designated as Grade No. 0 to Grade No. 1.
Claim 19
Dependent Claim
25 words
A friction material composition as in claim 17 wherein said steel fibers have lengths within the range of from about 1/16 to about 1/8 inch.
Claim 20
Dependent Claim
20 words
A friction material composition as in claim 14 wherein said organic component comprises a mixture of rubber and phenolic resin.
Claim 21
Dependent Claim
17 words
A friction material composition as in claim 19 wherein the rubber:resin volumetric ratio is at least 5.3:1.
Claim 22
Dependent Claim
17 words
A friction material composition as in claim 20 wherein said rubber:resin volumetric ratio is at least 10:1.
Claim 23
Dependent Claim
26 words
A friction material composition as in claim 14 wherein said rubber in said organic component is present as at least 35% by volume of the composition.
Claim 24
Dependent Claim
12 words
A railroad disc brake shoe composed of the composition of claim 1.
Claim 25
Dependent Claim
12 words
A railroad tread brake shoe composed of the composition of claim 1.
Claim 26
Dependent Claim
12 words
A railroad disc brake shoe composed of the composition of claim 14.
Claim 27
Dependent Claim
12 words
A railroad tread brake shoe composed of the composition of claim 14.
Claim 28
Dependent Claim
40 words
A friction material composition as in claim 16 consisting essentially of, in percent by weight: ______________________________________
organic component 42.7%
steel fiber 1.3%
carbonaceous component 21.9%
inorganic fillers 20.2%
additives 3.2%
friction modifiers 7.3%
cashew nut shell resin
particles 3.6%
______________________________________
Claim 29
Dependent Claim
40 words
A friction material composition as in claim 16 consisting essentially of, in percent by weight: ______________________________________
organic component 42.0%
steel fiber 1.3%
carbonaceous component 21.5%
inorganic fillers 21.2%
additives 3.2%
friction modifiers 7.3%
cashew nut shell resin
particles 3.5%
______________________________________
Claim 30
Dependent Claim
40 words
A friction material composition as in claim 16 consisting essentially of, in percent by weight: ______________________________________
organic component 42.7%
steel fiber 1.3%
carbonaceous component 21.9%
inorganic fillers 21.5%
additives 1.7%
friction modifiers 7.3%
cashew nut shell resin
particles 3.6%
______________________________________
Claim 31
Dependent Claim
40 words
A friction material composition as in claim 16 consisting essentially of, in percent by weight: ______________________________________
organic component 52.7%
steel fiber 3.1%
carbonaceous component 17.2%
inorganic fillers 17.3%
additives 2.4%
friction modifiers 4.5%
cashew nut shell resin
particles 2.8%
______________________________________
Claim 32
Dependent Claim
40 words
A friction material composition as in claim 16 consisting essentially of, in percent by weight: ______________________________________
organic component 34.7%
steel fiber 7.4%
carbonaceous component 17.9%
inorganic fillers 27.5%
additives 3.1%
friction modifiers 3.0%
cashew nut shell resin
particles 6.4%
______________________________________
Claim 33
Dependent Claim
11 words
A railroad tread brake composed of the composition of claim 27.
Claim 34
Dependent Claim
11 words
A railroad tread brake composed of the composition of claim 28.
Claim 35
Dependent Claim
11 words
A railroad tread brake composed of the composition of claim 29.
Claim 36
Dependent Claim
11 words
A railroad tread brake composed of the composition of claim 30.
Claim 37
Dependent Claim
11 words
A railroad disc brake composed of the composition of claim 31.
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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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |