US5217778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite fiber friction facing
Assignee: RAYMARK INDUSTRIES Inc 100 OAKVIEW DR TRUMBULL CT A CORP OF CONNECTICUT
•
Filing: 1982-10-21
•
Granted: 1993-06-08
•
Expires: 2002-10-21
Abstract
Abstract A dry clutch is prepared from a composite of fiber yarns, including fiberglass fibers and polymer fibers such as polyacrylonitrile fibers, which are blended together and twisted with wire. The yarns are shaped in a disc or other form and are bonded together with a heat curable binder system that includes an elastomer and a resin. The binder system also may contain organic and inorganic friction modifying particles.
Inventors
- 👤 Gregory J. LaCasse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:07
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; Y; Y10; Y10T; Y10T428/00; Y10T428/21; Y10T428/213; Y10T428/249921; Y10T428/249922; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2925; Y10T428/2927
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
170 words
A dry clutch facing comprising a yarn component and a binder component for binding the yarn component together, said yarn component comprising, based on the weight of said yarn component, of from about 10 to about 50 polyacrylonitrile fiber, from about 30 to about 80 percent glass fibers, and from a bout 5 to about 35 percent wire, said polyacrylonitrile fiber being twisted around a central core of said glass fibers to form composite yarn, with a plurality of said yarns being twisted together with said wire, said binder component comprising, based on the weight of said component, of from about 8 to about 25 percent elastomer, from about 10 to about 25 percent resin, and from about 50 about 85 percent friction particles, said yarn being coated with said binder and arranged in an undulating intersecting fashion, said binder being present at a level of from a bout 45 to about 85 percent, based on the total weight of the clutch facing, said clutch facing being free of asbestos.
Claim 2
Dependent Claim
170 words
A dry clutch facing comprising a yarn component and a binder component for binding the yarn component together, said yarn component comprising, based on the weight of said yarn component, of from about 10 to about 50 polyacrylonitrile fiber, from about 30 to about 80 percent glass fibers, and from a bout 5 to about 35 percent wire, said polyacrylonitrile fiber being twisted around a central core of said glass fibers to form composite yarn, with a plurality of said yarns being twisted together with said wire, said binder component comprising, based on the weight of said component, of from about 8 to about 25 percent elastomer, from about 10 to about 25 percent resin, and from about 50 about 85 percent friction particles, said yarn being coated with said binder and arranged in an undulating intersecting fashion, said binder being present at a level of from a bout 45 to about 85 percent, based on the total weight of the clutch facing, said clutch facing being free of asbestos.
Claim 3
Dependent Claim
15 words
The clutch facing of claim 1 wherein said binder component comprises ground cured rubber particles.
Claim 4
Dependent Claim
13 words
The clutch facing of claim 1 wherein said binder component comprises aramid fibers.
Claim 5
Dependent Claim
18 words
The clutch facing of claim 1 wherein said binder component comprises up to about 5 percent aramid fibers.
Claim 6
Dependent Claim
13 words
The friction material of claim 2 wherein the polyacrylonitrile fibers are partially carbonized.
Claim 7
Dependent Claim
82 words
In a friction element adapted for use in a clutch, said friction element comprising fiber strands impregnated with a binder resin composition and disposed in an undulating fashion and then cured to form a disc-shaped facing, the improvement wherein said fiber strands are in the form of a plied yarn comprising from about 30 to about 70 wt. % glass fiber, from about 15 to about 25 wt. % acrylic fiber and from about 5 to about 35 wt. % metallic filament.
Claim 8
Dependent Claim
82 words
In a friction element adapted for use in a clutch, said friction element comprising fiber strands impregnated with a binder resin composition and disposed in an undulating fashion and then cured to form a disc-shaped facing, the improvement wherein said fiber strands are in the form of a plied yarn comprising from about 30 to about 70 wt. % glass fiber, from about 15 to about 25 wt. % acrylic fiber and from about 5 to about 35 wt. % metallic filament.
Claim 9
Dependent Claim
45 words
In the friction element of claim 6 the improvement wherein said plied yarn comprises a plurality of twisted yarns, said twisted yarns having a helical twist and said plied yarn having a helical twist opposite in direction of the twist direction of the twisted yarns.
Claim 10
Dependent Claim
47 words
In the friction element of claim 6, the improvement wherein said plied yarn comprises at least two twisted yarns having a helical twist and at least one copper wire, said plied yarn having a helical twist opposite in direction to the twist direction of the twisted yarns.
Claim 11
Dependent Claim
77 words
A plied yarn adapted for use in the manufacture of friction elements, said plied yarn comprising from about 30 to about 70 wt. % glass fiber, from about 15 to about 25 wt. % acrylic fiber and from about 5 to about 35 wt. % metallic filament, wherein said plied yarn having a helical twist and comprising a plurality of twisted yarns having a helical twist opposite in direction to the twist direction of the plied yarn.
Claim 12
Dependent Claim
77 words
A plied yarn adapted for use in the manufacture of friction elements, said plied yarn comprising from about 30 to about 70 wt. % glass fiber, from about 15 to about 25 wt. % acrylic fiber and from about 5 to about 35 wt. % metallic filament, wherein said plied yarn having a helical twist and comprising a plurality of twisted yarns having a helical twist opposite in direction to the twist direction of the plied yarn.
Claim 13
Dependent Claim
18 words
The plied yarn of claim 9 comprising at least two twisted yarns and at least one copper wire.
References Cited (Backward Citations)
US2901388A
Cited
US2855081A
Cited
US3429766A
Cited
US3520390A
Cited
US3600258A
Cited
US4118528A
Cited
US4244994A
Cited
US4320823A
Cited
US4384640A
Cited
US4403047A
Cited
US4418115A
Cited
US4373038A
Cited
US4374211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |