US3349879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch and brake with control valve
Assignee: Edward Williams Holdings Ltd
•
Filing: 1965-06-21
•
Granted: 1967-10-31
•
Expires: 1985-06-21
Abstract
No abstract record available.
Inventors
- 👤 Stuart Duncan James Keith
- 👤 Fraser Peter Edward
- 👤 Payne John Michael
- 👤 Shotter Douglas Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:36
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; B; B23; B23Q; B23Q5/00; B23Q5/02; B23Q5/04; B23Q5/12; B23Q5/14; B23Q5/145; F16D; F16D67/00; F16D67/02; F16D67/04; F16H61/0262; B60; B60K; B60K2702/00; B60K2702/08; B60K2702/10; B60K2702/14; F16H2708/00; F16H2708/02; F16H2708/06; F16H2708/10; F16H2708/14; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86509; Y10T137/86517; Y10T137/86533; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19242; Y10T74/19247; Y10T74/19284; Y10T74/19293; Y10T74/19298; Y10T74/19326; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19433
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A CONTROL VALVE FOR USE IN A POWER TRANSMISSION MECHANISM INCORPORATING A CLUTCH AND A BRAKE, INCLUDING A VALVE BODY AND AN OPERATING MEMBER THEREFOR MOVABLE FROM A FIRST PORTION IN WHICH THE CLUTCH IS ENGAGED AND THE BRAKE DISENGAGED TO A SECOND POSITION IN WHICH THE CLUTCH IS DISENGAGED AND THE BRAKE ENGAGED, WITH SAID OPERATING MEMBER BEING POSITIONABLE IN AN INTERMEDIATE POSITION IN WHICH NEITHER CLUTCH NOR BRAKE IS FULLY ENGAGED AND IN WHICH SLIGHT MOVEMENT OF THE OPERATING MEMBER IN OPPOSITE DIRECTIONS INCREASES THE ENGAGEMENT OF THE CLUTCH OR BRAKE, SAID VALVE BODY HAVING A LONGITUDINAL BORE THEREIN, A PAIR OF PORTS COMMUNICATING WITH THE BORE AND ADAPTED FOR CONNECTION OF THE CLUTCH AND BRAKE RESPECTIVELY, FURTHER PORTS COMMUNICATING WITH THE BORE ADAPTED FOR CONNECTION TO A PRESSURE FLUID SUPPLY AND DRAIN RESPECTIVELY FIRST, SECOND, THIRD AND FOURTH ORIFICE DEFINING MEANS LOCATED WITHIN AND EXTENDING AXIALLY OF
Claim 2
Dependent Claim
150 words
A CONTROL VALVE FOR USE IN A POWER TRANSMISSION MECHANISM INCORPORATING A CLUTCH AND A BRAKE, INCLUDING A VALVE BODY AND AN OPERATING MEMBER THEREFOR MOVABLE FROM A FIRST PORTION IN WHICH THE CLUTCH IS ENGAGED AND THE BRAKE DISENGAGED TO A SECOND POSITION IN WHICH THE CLUTCH IS DISENGAGED AND THE BRAKE ENGAGED, WITH SAID OPERATING MEMBER BEING POSITIONABLE IN AN INTERMEDIATE POSITION IN WHICH NEITHER CLUTCH NOR BRAKE IS FULLY ENGAGED AND IN WHICH SLIGHT MOVEMENT OF THE OPERATING MEMBER IN OPPOSITE DIRECTIONS INCREASES THE ENGAGEMENT OF THE CLUTCH OR BRAKE, SAID VALVE BODY HAVING A LONGITUDINAL BORE THEREIN, A PAIR OF PORTS COMMUNICATING WITH THE BORE AND ADAPTED FOR CONNECTION OF THE CLUTCH AND BRAKE RESPECTIVELY, FURTHER PORTS COMMUNICATING WITH THE BORE ADAPTED FOR CONNECTION TO A PRESSURE FLUID SUPPLY AND DRAIN RESPECTIVELY FIRST, SECOND, THIRD AND FOURTH ORIFICE DEFINING MEANS LOCATED WITHIN AND EXTENDING AXIALLY OF
References Cited (Backward Citations)
US207646A
Cited
US2465942A
Cited
US2409506A
Cited
US2675024A
Cited
US2969045A
Cited
US3139908A
Cited
US3253613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |