Patent US3870581A successfully refreshed from Google Patents.
US3870581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction element and method of making same
Assignee: Johns Manville Corp
•
Filing: 1972-05-10
•
Granted: 1975-03-11
•
Expires: 1992-05-10
Abstract
Abstract A friction disc comprises continuous longitudinally co-extensive generally parallel glass strands wound spirally to the plane of the disc; short, generally parallel glass strands extending normal to the plane of the disc along said spiral; non-ferrous metal chips or wires; and a heat curable cement binding said glass strands and non-ferrous metal chips or wires together. The friction disc is made by forming a glass fabric with warp rovings of continuous parallel glass strands and fill rovings of continuous parallel glass strands; impregnating the fabric with a heat curable cement; winding the glass fabric onto a mandrel to form a spirally wrapped cylinder; slicing the cylinder into disc preforms; and molding the disc preforms under heat and pressure. Either non-ferrous metal wires are included in the fabric or nonferrous metal chips are deposited on the fabric prior to wrapping the fabric onto the mandrel.
Inventors
- 👤 Frank D Afflerbach
- 👤 Irvin Barnett
- 👤 Walter B Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:13
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
134 words
A method of making a friction element compriSing: a. forming a fabric consisting essentially of glass having warp strands and fill strands; b. impregnating said glass fabric with a curable cement; c. winding said glass fabric onto a mandrel to form a spirally wrapped hollow cylinder; d. slicing said cylinder into disc preforms, each of said discs having a series of spirally wound, continuous, parallel strands of glass fiber extending in a circumferential direction thereof and a series of parallel strands of glass fiber disposed normally of the faces of said disc to provide frictional properties thereto, each of said disc preforms having an axial thickness substantially less than the annular width thereof; and e. molding said disc preforms under heat and pressure to form friction elements containing glass fiber reinforcement and friction elements.
Claim 2
Independent Claim
134 words
A method of making a friction element compriSing: a. forming a fabric consisting essentially of glass having warp strands and fill strands; b. impregnating said glass fabric with a curable cement; c. winding said glass fabric onto a mandrel to form a spirally wrapped hollow cylinder; d. slicing said cylinder into disc preforms, each of said discs having a series of spirally wound, continuous, parallel strands of glass fiber extending in a circumferential direction thereof and a series of parallel strands of glass fiber disposed normally of the faces of said disc to provide frictional properties thereto, each of said disc preforms having an axial thickness substantially less than the annular width thereof; and e. molding said disc preforms under heat and pressure to form friction elements containing glass fiber reinforcement and friction elements.
Claim 3
Independent Claim
130 words
A METHOD OOF MAKING A FRICTION ELEMENT COMPRISING: A. FORMING A FABRIC CONSISTING ESSENTIALLY OF GLASS HAVING WARP STRANDS AND FILL STRANDS, B. IMPREGNATING SAID GLASS FABRIC WITH A CURABLE CEMENT, C. WINDING SAID GLASS FABRIC ONTO A MANDREL TO FORM A SPIRALLY WRAPPED HOLLOW CYLINDER, D. SLICING SAID CYLINDER INTO DISC PERFORMS, EACH OF SAID DISC HAVING A SERIES OOF SPIRALLY WOUND, CONTINUOUS, PARALLEL STRANDS OF GLASS FIBER EXTENDING IN A CIRCUMFERENTIAL DIRECTION THEREOF AND A SERIES OF PARALLEL STRANDS OF GLASS FIBER DISPOSED NORMALLY OF THE FACES OF SAID DISC TO PROVIDE FRICTIONAL PROPERTIES THERETO, EACH OF SAID DISC PREFORMS HAVING AN AXIAL THICKNESS SUBSTANTIALLY LESS THAN THE ANNULAR WIDTH THEREOF, AND E. MOLDING SAID DISC PREFORMS UNDER HEAT AND PRESSURE TO FORM FIRCTION ELEMENTS CONTAINING GLASS FIBER
Claim 4
Independent Claim
130 words
A METHOD OOF MAKING A FRICTION ELEMENT COMPRISING: A. FORMING A FABRIC CONSISTING ESSENTIALLY OF GLASS HAVING WARP STRANDS AND FILL STRANDS, B. IMPREGNATING SAID GLASS FABRIC WITH A CURABLE CEMENT, C. WINDING SAID GLASS FABRIC ONTO A MANDREL TO FORM A SPIRALLY WRAPPED HOLLOW CYLINDER, D. SLICING SAID CYLINDER INTO DISC PERFORMS, EACH OF SAID DISC HAVING A SERIES OOF SPIRALLY WOUND, CONTINUOUS, PARALLEL STRANDS OF GLASS FIBER EXTENDING IN A CIRCUMFERENTIAL DIRECTION THEREOF AND A SERIES OF PARALLEL STRANDS OF GLASS FIBER DISPOSED NORMALLY OF THE FACES OF SAID DISC TO PROVIDE FRICTIONAL PROPERTIES THERETO, EACH OF SAID DISC PREFORMS HAVING AN AXIAL THICKNESS SUBSTANTIALLY LESS THAN THE ANNULAR WIDTH THEREOF, AND E. MOLDING SAID DISC PREFORMS UNDER HEAT AND PRESSURE TO FORM FIRCTION ELEMENTS CONTAINING GLASS FIBER
Claim 5
Dependent Claim
31 words
THE METHOD OF MAKING A FRICTION ELEMENT AS DEFINED IN CLAIM 1 FURTHER COMPRISING DISTRIBUTING NON-FEROUS METAL CHIPS OVER SAID GLASS FABRIC PRIOR TO WINDING SAID GLASS FABRIC ONTO THE MANDREL.
Claim 6
Dependent Claim
31 words
The method of making a friction element as defined in claim 1 further comprising distributing non-ferous metal chips over said glass fabric prior to winding said glass fabric onto the mandrel.
Claim 7
Dependent Claim
22 words
The method of making a friction element as defined in claim 1 further comprising incorporating non-ferrous metal strands in said glass fabric.
Claim 8
Dependent Claim
22 words
The method of making a friction element as defined in claim 1 further comprising incorporating non-ferrous metal strands in said fill strands.
Claim 9
Dependent Claim
32 words
The method of making a friction element as defined in claim 1 further comprising forming said glass fabric with rovings having continuous parallel glass warp strands and continuous parallel glass fill strands.
Claim 10
Dependent Claim
24 words
The method of making a friction element as defined in claim 5 further comprising incorporating non-ferrous metal strands in with said glass fill strands.
Claim 11
Dependent Claim
37 words
The method of making a friction element as defined in claim 1 further comprising: a. using a heat curable cement for said curable cement; and b. employing heat and pressure in said molding of said disc preform.
Claim 12
Dependent Claim
46 words
The method of making a friction element as defined in claim 7 further comprising drying said glass fabric after it has been impregnated with said curable cement and prior to winding said glass fabric on said mandrel to drive off volatiles without setting up the cement.
Claim 13
Dependent Claim
23 words
The method of making a friction element as defined in claim 8 further comprising using a rubber-phenolic friction cement for said curable cement.
Claim 14
Dependent Claim
57 words
The method of making a friction element as defined in claim 1 further comprising using a mandrel having an external diameter substantially equal to the inside diameter of the friction element and tightly winding said glass fabric on said mandrel until said cylinder has an outside diameter substantially equal to the outside diameter of said friction element.
References Cited (Backward Citations)
US1348755A
Cited
US860720A
Cited
US1162384A
Cited
US1457625A
Cited
US2054210A
Cited
US2146518A
Cited
US2196570A
Cited
US2255504A
Cited
US2360830A
Cited
US2567186A
Cited
US2522346A
Cited
US2648618A
Cited
US2759522A
Cited
US2585539A
Cited
US2802513A
Cited
US2927623A
Cited
US3244572A
Cited
US3365041A
Cited
US3429766A
Cited
US3520390A
Cited
US3526306A
Cited
US3600258A
Cited
US3743069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |