Patent US3285379A successfully refreshed from Google Patents.
US3285379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure clutch with spring cushion
Assignee: Ford Motor Co
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Filing: 1964-10-21
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Granted: 1966-11-15
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Expires: 1984-10-21
Abstract
No abstract record available.
Inventors
- 👤 Carl A Helquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:29
CPC Classifications
F; F16; F16D; F16D25/00; F16D25/06; F16D25/062; F16D25/063; F16D25/0635; F16D25/0638
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A MULTIPLE DISC CLUTCH ASSEMBLY COMPRISING A DRIVING ELEMENT, A DRIVEN ELEMENT, A FRIST SET OF FRICTION DISCS CARRIED BY ONE ELEMENT, A SECOND SET OF FRICTION DISCS CARRIED BY THE OTHER ELEMENT, SAID DISCS BEING SITUATED IN INTERDIGITAL RELATIONSHIP, A REACTION DISC CARRIED BY SAID ONE ELEMENT ON ONE AXIAL SIDE OF SAID DISCS, AN ANNULAR CYLINDER DEFINED BY ONE OF SAID ELEMENTS, AN ANNULAR PISTON SITUATED WITH SAID CYLINDER AND COOPERATING THEREWITH TO DEFINE A PRESSURE CHAMBER, SAID ANNULAR PISTON INCLUDING A DISC ENGAGING SURFACE PROXIMATE TO BUT AXIALLY SPACED FROM SAID DISCS, AN ANNULAR GROOVE FORMED IN SAID PISTON SURFACE, A CIRCULAR PISTON SPRING SITUATED IN SAID ANNULAR GROOVE, SAID SPRING BEING FORMED WITH UNDULATIONS THAT EXTEND AXIALLY WITH RESPECT TO THE AXIS OF SAID CLUTCH DISC ASSEMBLY, THE DEPTH OF SAID GROOVE BEING SUBSTANTIALLY GREATER THAN THE AXIAL THICKNESS OF SAID SPRING.
Claim 2
Dependent Claim
146 words
A MULTIPLE DISC CLUTCH ASSEMBLY COMPRISING A DRIVING ELEMENT, A DRIVEN ELEMENT, A FRIST SET OF FRICTION DISCS CARRIED BY ONE ELEMENT, A SECOND SET OF FRICTION DISCS CARRIED BY THE OTHER ELEMENT, SAID DISCS BEING SITUATED IN INTERDIGITAL RELATIONSHIP, A REACTION DISC CARRIED BY SAID ONE ELEMENT ON ONE AXIAL SIDE OF SAID DISCS, AN ANNULAR CYLINDER DEFINED BY ONE OF SAID ELEMENTS, AN ANNULAR PISTON SITUATED WITH SAID CYLINDER AND COOPERATING THEREWITH TO DEFINE A PRESSURE CHAMBER, SAID ANNULAR PISTON INCLUDING A DISC ENGAGING SURFACE PROXIMATE TO BUT AXIALLY SPACED FROM SAID DISCS, AN ANNULAR GROOVE FORMED IN SAID PISTON SURFACE, A CIRCULAR PISTON SPRING SITUATED IN SAID ANNULAR GROOVE, SAID SPRING BEING FORMED WITH UNDULATIONS THAT EXTEND AXIALLY WITH RESPECT TO THE AXIS OF SAID CLUTCH DISC ASSEMBLY, THE DEPTH OF SAID GROOVE BEING SUBSTANTIALLY GREATER THAN THE AXIAL THICKNESS OF SAID SPRING.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |