US3712428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced carbon bodies
Assignee: Unifrax I LLC
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Filing: 1970-06-22
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Granted: 1973-01-23
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Expires: 1990-06-22
Abstract
Abstract The strength of circumferentially wound carbon-fiber reinforced carbon bodies is vastly improved if the reinforcing fibers are wound loosely, to a width greater than the axial thickness of the desired carbon body, and then axially compressed to cause radial overlapping of the carbon fibers. This technique is particularly useful for carbon bodies having an irregular perimeter, such as brake discs containing keyways or other indentations for bearing circumferential stress, since the reinforcing fibers adjacent to the stress-bearing perimeter can be made to conform substantially to the shape of the perimeter and the indentations therein.
Inventors
- 👤 G Marin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:17
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/023; C; C01; C01B; C01B32/00; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; F16D65/00; F16D65/02; F16D65/12; F16D65/125; F16D65/126; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
96 words
A reinforced carbon brake disc, comprising (1) an underlying network of reinforcing carbon fibers; and (2) a matrix of carbonized binder binding together the underlying network of reinforcing fibers, characterized in that the reinforcing fibers comprise fibers which are successively circumferentially wound, axially compressed, and radially overlapped throughout the circumference of the disc in each cross-sectional plane containing the axis of the disc; said disc having at least one perimeter which is adapted to bear circumferential stress, the circumferentially wound reinforcing fibers adjacent to said stress-bearing perimeter conforming substantially to the shape of said stress-bearing perimeter.
Claim 2
Dependent Claim
96 words
A reinforced carbon brake disc, comprising (1) an underlying network of reinforcing carbon fibers; and (2) a matrix of carbonized binder binding together the underlying network of reinforcing fibers, characterized in that the reinforcing fibers comprise fibers which are successively circumferentially wound, axially compressed, and radially overlapped throughout the circumference of the disc in each cross-sectional plane containing the axis of the disc; said disc having at least one perimeter which is adapted to bear circumferential stress, the circumferentially wound reinforcing fibers adjacent to said stress-bearing perimeter conforming substantially to the shape of said stress-bearing perimeter.
Claim 3
Dependent Claim
44 words
The reinforced carbon brake disc of claim 1, having an outer perimeter provided with indentations adapted to bear circumferential stress, and comprising reinforcing fibers adjacent to said outer perimeter, which fibers conform substantially to the shape of said outer perimeter and the indentations therein.
Claim 4
Dependent Claim
36 words
The reinforced carbon brake disc of claim 1, having an outer perimeter provided with substantially equally spaced rectangular indentations, the reinforcing fibers adjacent to said outer perimeter conforming substantially to said perimeter and the indentations therein.
Claim 5
Dependent Claim
13 words
The reinforced carbon brake disc of claim 2, having a scalloped outer perimeter.
Claim 6
Dependent Claim
44 words
The reinforced carbon brake disc of claim 1, having an inner perimeter provided with indentations adapted to bear circumferential stress, and comprising reinforcing fibers adjacent to said inner perimeter which fibers conform substantially to the shape of said inner perimeter and the indentations therein.
Claim 7
Dependent Claim
36 words
The reinforced carbon brake disc of claim 5, having an inner perimeter provided with substantially equally spaced rectangular indentations, the reinforcing fibers adjacent to said inner perimeter conforming substantially to said perimeter and the indentations therein.
Claim 8
Dependent Claim
13 words
The reinforced carbon brake disc of claim 5, having a scalloped inner perimeter.
Claim 9
Dependent Claim
27 words
The reinforced carbon brake disc of claim 1, comprising carbon fibers coated with from about 10 percent to about 30 percent by weight of a refractory material.
Claim 10
Dependent Claim
15 words
The reinforced carbon brake disc of claim 8, wherein said refractory material is silicon carbide.
Claim 11
Dependent Claim
57 words
The reinforced carbon brake disc of claim 1, comprising in at least a portion of the carbon brake disc, an additive selective from the group consisting of niobium, silicon, tantalum, titanium, tungsten and zirconium; carbides of boron, niobium, tantalum, tungsten and zirconium; and nitrides of aluminum, boron, niobium, silicon, tantalum, titanium, tungsten and zirconium; and mixtures thereof.
Claim 12
Dependent Claim
28 words
The reinforced carbon brake disc of claim 10, wherein the additive is selected from the group consisting of niobium, silicon, tantalum, titanium, tungsten and zirconium, and mixtures thereof.
Claim 13
Dependent Claim
29 words
The reinforced carbon brake disc of claim 10, wherein the additive is selected from the group consisting of carbides of boron, niobium, tantalum, tungsten and zirconium and mixtures thereof.
Claim 14
Dependent Claim
32 words
The reinforced carbon brake disc of claim 10, wherein the additive is selected from the group consisting of nitrides of aluminum, boron, niobium, silicon, tantalum, titanium, tungsten and zirconium, and mixtures thereof.
Claim 15
Dependent Claim
40 words
The reinforced carbon brake disc of claim 10, wherein said additive is particulate and is present in an amount equal to from about 0.25 to about 5 percent by volume of the portion of the carbon body containing the additive.
Claim 16
Dependent Claim
94 words
The reinforced carbon brake disc of claim 1, wherein said reinforcing carbon fibers comprise woven carbon cloth, loosely spirally wound such that the width of the cloth runs in the direction of the axial thickness of the carbon brake disc; but said width, prior to axial compression, is substantially greater than the axial thickness of the carbon brake disc; said spirally wound carbon Cloth being axially compressed to approximate the axial thickness of the carbon brake disc, whereby to effect radial overlapping of the circumferentially wound fibers of the spirally wound reinforcing carbon cloth.
Claim 17
Dependent Claim
39 words
The reinforced carbon brake disc of claim 15, wherein the ratio of the width of the spirally wound carbon cloth, prior to axial compression, to the thickness of the carbon brake disc ranges from about 1.25:1 to about 3:1.
Claim 18
Dependent Claim
35 words
The reinforced carbon brake disc of claim 15, wherein the ratio of the width of the spirally wound carbon cloth prior to axial compression to the thickness of the carbon brake disc is about 2:1.
Claim 19
Dependent Claim
68 words
The reinforced carbon brake disc of claim 1, wherein said reinforcing carbon fibers comprise unwoven carbon yarn, loosely wound to a width which is, prior to axial compression, substantially greater than the axial thickness of the carbon brake disc; said loosely wound unwoven carbon yarn being axially compressed to approximate the axial thickness of the carbon brake disc, whereby to effect radial overlapping of the wound carbon yarn.
Claim 20
Dependent Claim
40 words
The reinforced carbon brake disc of claim 18, wherein the ratio of the width of the loosely wound carbon yarn, prior to axial compression, to the axial thickness of the carbon brake disc ranges from about 1.25:1 to about 3:1.
Claim 21
Dependent Claim
36 words
The reinforced carbon brake disc of claim 18, wherein the ratio of the width of the loosely wound carbon yarn, prior to axial compression, to the axial thickness of the carbon brake disc is about 2:1.
Claim 22
Dependent Claim
38 words
The reinforced carbon brake disc of claim 1, having a circumferentially nonuniform radial depth, and comprising means for balancing the fiber density of the underlying network of reinforcing carbon fibers to compensate for said circumferentially nonuniform radial depth.
Claim 23
Dependent Claim
52 words
The reinforced carbon brake disc of claim 21, wherein said means for balancing the fiber density of the underlying network of reinforcing carbon fibers to compensate for said circumferentially nonuniform radial depth comprises supplemental carbon inserted between circumferential windings of the circumferentially wound reinforcing carbon fibers in locations of greater radial depth.
Claim 24
Dependent Claim
64 words
The reinforced carbon brake disc of claim 21, wherein said means for balancing the fiber density of the underlying network of reinforcing carbon fibers to compensate for said circumferentially nonuniform radial depth comprises conforming a perimeter of the reinforced carbon brake disc which is not to be subjected to circumferential stress to a geometric shape which compensates for said circumferential nonuniformities in radial depth.
Claim 25
Dependent Claim
45 words
The reinforced carbon brake disc of claim 21, wherein said means for balancing the fiber density of the underlying network of reinforcing carbon fibers to compensate for circumferentially nonuniform radial depth comprises circumferential overlapping of the reinforcing carbon fibers in areas of greater radial depth.
Claim 26
Dependent Claim
50 words
The reinforced carbon brake disc of claim 21, wherein said means for balancing the fiber density of the underlying network of reinforcing carbon fibers to compensate for said circumferentially nonuniform radial depth comprises supplemental carbon positioned adjacent to the circumferentially wound reinforcing carbon fibers in locations of greater radial depth.
Claim 27
Dependent Claim
26 words
The reinforced carbon brake disc of claim 25, wherein said supplemental carbon is positioned in locations to be subjected to frictional contact with adjacent brake discs.
Claim 28
Dependent Claim
17 words
The reinforced carbon brake disc of claim 26, said supplemental carbon having interspersed therein particulate ditungsten monoboride.
Claim 29
Dependent Claim
45 words
The reinforced carbon brake disc of claim 21, wherein said means for balancing the fiber density of the underlying network of reinforcing carbon fibers to compensate for said circumferentially nonuniform radial depth comprises the removal of excess carbon fibers in locations of lesser radial depth.
Claim 30
Dependent Claim
31 words
The reinforced carbon brake disc of claim 28, wherein said eXcess carbon fibers in locations of lesser radial depth are removed by cutting away portions of the circumferentially wound carbon fibers.
Claim 31
Dependent Claim
26 words
The reinforced carbon brake disc of claim 28, wherein carbon fibers woven among the circumferentially wound carbon fibers are removed in locations of lesser radial depth.
References Cited (Backward Citations)
US3552533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |