US3224537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid operated clutch with operator sensing signal
Assignee: Twin Disc Inc
•
Filing: 1961-08-03
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Granted: 1965-12-21
•
Expires: 1981-08-03
Abstract
No abstract record available.
Inventors
- 👤 Conrad R Hilpert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:11
CPC Classifications
F; F16; F16D; F16D48/00; F16D48/02; F16D48/0206; F16D25/00; F16D25/12; F16D25/123; F16D48/04; F16H; F16H61/00; F16H61/14; F16D2048/0209
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A POWER TRANSMITTING STRUCTURE COMPRISING A PRESSURE LIQUID SOURCE, A HYDRAULICALLY ACTUATED CLUTCH INCLUDING A PLURALITY OF FRICTION PLATES, A PISTON MEMBER AND A CHAMBER FOR RECEIVING PRESSURE LIQUID TO MOVE THE PISTON MEMBER TOWARDS THE PLATES, A PRESSURE REGULATING VALVE INTERPOSED BETWEEN THE SOURCE AND CLUTCH, A ROCKABLE PEDAL FOR VARYING THE POSITION OF THE VALVE BETWEEN LIMIT POSITIONS THEREOF RESPECTIVELY DETERMINING FULL RELEASE OF THE PLATES AND A RELATIVELY HIGH PRESSURE IN THE CHAMBER TO ESTABLISH A MAXIMUM TORQUE TRANSMITTING CONDITION OF THE PLATES AND INCLUDING AN INTERMEDIATE RELATIVELY LOW PRESSURE POSITION, MEANS ASSOCIATED WITH THE
Claim 2
Dependent Claim
98 words
A POWER TRANSMITTING STRUCTURE COMPRISING A PRESSURE LIQUID SOURCE, A HYDRAULICALLY ACTUATED CLUTCH INCLUDING A PLURALITY OF FRICTION PLATES, A PISTON MEMBER AND A CHAMBER FOR RECEIVING PRESSURE LIQUID TO MOVE THE PISTON MEMBER TOWARDS THE PLATES, A PRESSURE REGULATING VALVE INTERPOSED BETWEEN THE SOURCE AND CLUTCH, A ROCKABLE PEDAL FOR VARYING THE POSITION OF THE VALVE BETWEEN LIMIT POSITIONS THEREOF RESPECTIVELY DETERMINING FULL RELEASE OF THE PLATES AND A RELATIVELY HIGH PRESSURE IN THE CHAMBER TO ESTABLISH A MAXIMUM TORQUE TRANSMITTING CONDITION OF THE PLATES AND INCLUDING AN INTERMEDIATE RELATIVELY LOW PRESSURE POSITION, MEANS ASSOCIATED WITH THE
References Cited (Backward Citations)
US1938780A
Cited
FR758002A
Cited
US2151153A
Cited
US2301099A
Cited
US2286671A
Cited
US2669330A
Cited
US2727611A
Cited
US3004447A
Cited
US3033335A
Cited
US2925156A
Cited
US3040852A
Cited
US2968967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |