Patent US3681940A successfully refreshed from Google Patents.
US3681940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction clutch
Assignee: Olivetti SpA
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Filing: 1970-07-10
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Granted: 1972-08-08
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Expires: 1990-07-10
Abstract
Abstract A friction clutch having at least one driven disk, a driving disk, and a friction disk interposed between each of the driven disks and the driving disk. The coefficient of friction between the driven disk and the friction disk is greater than the coefficient of friction between the driving disk and the friction disk when below a predetermined temperature and less than the coefficient of friction between the driving disk and the friction disk above the predetermined temperature.
Inventors
- 👤 Walter Albrile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:38
CPC Classifications
B; B41; B41J; B41J11/00; B41J11/24; F; F16; F16D; F16D7/00; F16D7/02; F16D7/024; F16D7/025
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
206 words
A friction clutch for transmitting rotational motion comprising: a driven disk connected to an output element, a driving disk connected to a driving means to be driven in rotation, said driving disk being in opposed relationship to said driven disk and biased theretoward, a friction disk interposed between said driven disk and said driving disk, a first pair of engaging clutch faces, one of said faces being carried by said driven disk and the other of said faces being carried by said Friction disk, a second pair of engaging clutch faces, one of said faces being carried by said driving disk and the other of said faces being carried by said friction disk, the coefficient of friction of one of said pairs being greater than the coefficient of friction of the other of said pairs below a predetermined temperature and less than the coefficient of friction of said other of said pairs above said predetermined temperature, so that when relative rotational motion occurs between said driving disk and said driven disk, sliding takes place alternately between said first pair of friction faces and said second pair of friction faces, depending upon whether the temperature of the sliding faces is greater or less than said predetermined temperature.
Claim 2
Dependent Claim
206 words
A friction clutch for transmitting rotational motion comprising: a driven disk connected to an output element, a driving disk connected to a driving means to be driven in rotation, said driving disk being in opposed relationship to said driven disk and biased theretoward, a friction disk interposed between said driven disk and said driving disk, a first pair of engaging clutch faces, one of said faces being carried by said driven disk and the other of said faces being carried by said Friction disk, a second pair of engaging clutch faces, one of said faces being carried by said driving disk and the other of said faces being carried by said friction disk, the coefficient of friction of one of said pairs being greater than the coefficient of friction of the other of said pairs below a predetermined temperature and less than the coefficient of friction of said other of said pairs above said predetermined temperature, so that when relative rotational motion occurs between said driving disk and said driven disk, sliding takes place alternately between said first pair of friction faces and said second pair of friction faces, depending upon whether the temperature of the sliding faces is greater or less than said predetermined temperature.
Claim 3
Dependent Claim
48 words
A friction clutch according to claim 1 wherein said output element is a driven shaft and said driven disk is mounted on and connected to said driven shaft to impart rotation thereto, and wherein said driving disk and said friction disk are freely mounted on said driven shaft.
Claim 4
Dependent Claim
31 words
A friction clutch according to claim 2 wherein said driving disk and said friction disk are biased axially toward said driven disk by spring means freely mounted on said driven shaft.
Claim 5
Dependent Claim
36 words
A friction clutch according to claim 3 wherein said clutch faces are integral with the respective said disks, and said driving disk is of thermoplastic material and said driven disk and friction disk are of metal.
Claim 6
Dependent Claim
166 words
A friction clutch according to claim 1 further comprising a second driven disk in opposed relationship to the side of said driving disk opposite said driven disk, said second driven disk being biased toward said driving disk, a second friction disk interposed between said driving disk and said second driven disk, a third pair of engaging clutch faces, one of said faces being carried by said second driven disk and the other of said faces being carried by said second friction disk, a fourth pair of engaging clutch faces, one of said faces being carried by said driving disk and the other of said faces being carried by said second friction disk, the coefficient of friction of one pair of said third and fourth pairs being greater than the coefficient of friction of the other pair of said third and fourth pairs below a predetermined temperature and less than the coefficient of friction of said other of said third and fourth pairs above said predetermined temperature.
Claim 7
Dependent Claim
48 words
A friction clutch according to claim 5 wherein said output element is a driven shaft and said driven disks are mounted on and connected to said driven shaft to impart rotation thereto, and wherein said driving disk and said friction disks are freely mounted on said driven shaft.
Claim 8
Dependent Claim
34 words
A friction clutch according to claim 6 wherein said driving disk, said friction disks and said second driven disk are biased toward said driven disk by spring means freely mounted on said driven shaft.
Claim 9
Dependent Claim
37 words
A friction clutch according to claim 7 wherein said clutch faces are integral with the respective said disks, and said driving disk is of thermoplastic material and said driven disks and said friction disks are of metal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |