Patent US3664472A successfully refreshed from Google Patents.
US3664472A
Expired / Lapsed
US
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Coupling with thermoplastic and cellulosic friction disc
Assignee: Kombinat Veb Messgeratewerk Zwonitz
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Filing: 1969-12-10
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Granted: 1972-05-23
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Expires: 1989-12-10
Abstract
Abstract In a friction clutch, in order to ensure the transmission of a torque that is substantially independent of the temperatures generated by the slippage of the contacting driving and driven friction elements urged into engagement by spring means, the work face of one friction element is a thermoplastic material, such as Teflon, while the work face of the other friction element is cork.
Inventors
- 👤 Karl Martini
- 👤 Peter Forster
- 👤 Dieter Bierbaum
- 👤 Gunther Halm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:18
CPC Classifications
F; F16; F16D; F16D7/00; F16D7/02; F16D7/024; F16D7/025; Y; Y10; Y10S; Y10S464/00; Y10S464/902; Y10S464/903
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
16 words
A clutch as defined in claim 1 wherein said thermoplastic resin is a fluorinated hydrocarbon polymer.
Claim 2
Dependent Claim
13 words
A clutch as defined in claim 1 wherein said cellulosic material is cork.
Claim 3
Dependent Claim
19 words
A clutch as defined in claim 1 wherein said cellulosic material and said resins are cork and polytetrafluoroethylene, respectively.
Claim 4
Dependent Claim
89 words
A friction clutch for transmitting a limited torque substantially independently of temperature, comprising: a driving member, a driven member entrainable by said driving member; and a plurality of coaxially juxtaposed friction elements including a first element rotatively coupled with said driving member and a second element rotatively coupled with said driven member, one of said elements being a metallic disk having a coating of polytetrafluoroethylene at most 100 microns in thickness, the other of said elements being composed of cork and being engageable with said coating on said disk.
Claim 5
Dependent Claim
25 words
A clutch as defined in claim 5 wherein said outer disks are metallic and provided on their inner surfaces with layers of said thermoplastic resin.
Claim 6
Dependent Claim
27 words
A clutch as defined in claim 6 wherein said housing is provided with axially extending peripheral slots, said outer disks having lugs slidably received in said slots.
Claim 7
Dependent Claim
26 words
A clutch as defined in claim 6 wherein said stack further includes a pair of floatingly disposed disks between said outer disks and said inner disk.
Claim 8
Dependent Claim
18 words
A clutch as defined in claim 8 wherein said floatingly disposed disks consist in their entirety of cork.
Claim 9
Dependent Claim
28 words
A clutch as defined in claim 6 wherein said thermoplastic resin Forms a layer of a thickness up to substantially 100 microns on each of said inner surfaces.
Claim 10
Dependent Claim
30 words
A clutch as defined in claim 5 wherein said shaft is provided with a radially projecting dog, said detent means comprising a catch interposable in the orbit of said dog.
References Cited (Backward Citations)
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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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |