US3334530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure circuit
Assignee: Axel Wickman Transmissions Ltd
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Filing: 1965-02-12
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Granted: 1967-08-08
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Expires: 1985-02-12
Abstract
No abstract record available.
Inventors
- 👤 Alan S Lamburn
- 👤 Abbott Randle Leslie
- 👤 John R Hillman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:10
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F16; F16H; F16H61/00; F16H61/02; F16H61/0262; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/30525; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/50536; F15B2211/55; F15B2211/57; F15B2211/60; F15B2211/61; F15B2211/611; F15B2211/615; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7052; F15B2211/76; F16H2716/00; F16H2716/04; F16H2716/06; Y; Y10; Y10S; Y10S74/00; Y10S74/01
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
304 words
A FLUID PRESSURE CIRCUIT INCLUDING A FIRST FLUID PRESSURE OPERABLE DIVICE, A SECOND FLUID PRESSURE OPERABLE DEVICE, A SOURCE OF FLUID CONNECTED TO SAID FIRST DEVICE, AN EXHAUST PATH FOR SAID FLUID, A MOVABLE MEMBER, MEANS FOR BIASING SAID MOVABLE MEMBER TO RESTRICT SAID EXHAUST PATH, SAID MOVABLE MEMBER AND SAID BIASING MEANS CONSTITUTING A PRESSURE RELIEF VALVE ADAPTED TO PREVENT THE PRESSURE OF THE FLUID ACTING ON SAID FIRST DEVICE FROM FALLING BELOW A PREDETERMINED MINIMUM VALUE, AN AXIALLYMOVABLE PISTON HAVING A GREATER EFFECTIVE AREA THAN THAT OF SAID MOVABLE MEMBER, A BODY DEFINING A CYLINDER BORE COACTING WITH SAID PISTON, A RESILIENTLY DISTORTABLE MEANS OPERATIVELY INTERCONNECTING THE PISTON AND THE MOVABLE MEMBER, A VALVE MEANS ADAPTED OPTIONALLY TO CONNECT SAID SOURCE OF FLUID TO ACT ON THE PISTON WHEREBY THE FORCE GENERATED BY THE FLUID PRESSURE ON THE PISTON WILL BE TRANSMITTED THROUGH SAID RESILIENTLY DISTORTABLE MEANS TO ACT ON THE MOVABLE MEMBER THEREBY TO INCREASE THE PRESSURE OF THE SOURCE OF FLUID ABOVE SAID MINIMUM VALUE, A RESILIENTLY DISTORABLE BUFFER ARRANGED TO ACT PROGRESSIVELY ON THE PISTON IN OPPOSITION TO SAID FORCE GENERATED BY THE FLUID PRESSURE WHEREBY THE FORCES EXERTED ON THE PISTON BY THE FLUID PRESSURE AND BY SAID RESILIENTLY DISTORTABLE MEANS AND BY SAID RESILIENTLY DISTORTABLE BUFFER AND SAID BIASING MEANS ARE IN EQUILIBRIUM WHEN THE PRESSURE OF THE SOURCE OF FLUID HAS REACHED A PREDETERMINED MAXIMUM VALUE, SAID BODY DEFINING A VALVE PORT COMMUNICATING WITH SAID CYLINDER BORE, SAID VALVE PORT CONNECTED TO THE SAID SECOND DEVICE, THE PISTON ARRANGED TO CLOSE SAID VALVE PORT WHEN THE PRESSURE OF THE FLUID ACTING ON SAID PISTON IS AT SAID MINIMUM VALUE, AND THE PISTON ARRANGED TO OPEN SAID VALVE PORT WHEN THE PRESSURE OF THE SOURCE OF FLUID EXCEEDS A PREDETERMINED VALUE INTERMEDIATE SAID MAXIMUM AND MINIMUM VALUES.
Claim 2
Dependent Claim
235 words
A FLUID PRESSURE CIRCUIT, ACCORDING TO CLAIM 4, IN WHICH A DASHPOT CONSTITUTES SAID SECOND FLUID PRESSURE OPERABLE DEVICE, SAID DASHPOT IS ADAPTED TO STORE A VOLUME OF FLUID UNDER PRESSURE WHEN THE VALVE PORT IS OPENED BY THE PISTON, A FLOW RESTRICTOR, SAID VALVE MEANS IS OPERABLE BETWEEN A FIRST POSITION IN WHICH THE SOURCE OF FLUID IS CONNECTED TO ACT ON THE PISTON AND A SECOND POSITION IN WHICH THE SOURCE OF FLUID IS ISOLATED FROM THE PISTON AND THE FLUID ACTING ON THE PISTON IS CONNECTED TO SAID EXHAUST PATH THROUGH SAID FLOW RESTRICTOR, A NON-RETURN VALVE AND THE DASHPOT IS CONNECTED THROUGH SAID NON-RETURN VALVE TO A POINT IN THE FLUID CIRCUIT INTERMEDIATE THE PISTON AND THE FLOW RESTRICTOR WHEREBY, WHEN THE VALVE MEANS IS OPERATED TO THE SECOND POSITION AND THE PRESSURE OF THE FLUID ACTING ON THE PISTON HAS DROPPED TO A VALUE BELOW THE PRESSURE OF THE VOLUME OF FLUID STORED BY THE DASHPOT, THE FLUID STORED BY THE DASHPOT WILL PASS THROUGH THE NONRETURN VALVE TO INCREASE THE VOLUME OF FLUID THAT MUST PASS THROUGH THE FLOW RESTRICTOR THEREBY TO DECREASE THE RATE AT WHICH THE PRESSURE ACTING ON THE PISTON WILL DECAY AND CONSEQUENTLY TO DECREASE THE RATE AT WHICH THE PRESSURE OF THE SOURCE OF FLUID AND THE PRESSURE ACTING ON THE SAID FIRST FLUID PRESSURE OPERABLE DEVICE WILL DECAY TO THE SAID MINIMUM VALUE.
Claim 3
Dependent Claim
169 words
A FLUID PRESSURE CIRCUIT, ACCORDING TO CLAIM 5, A CHANGE-SPEED GEARING, A FIRST FRICTION SURFACE, A SECOND FRICTION SURFACE, A RATIO-SELECTING MEMBER ADAPTED OPTIONALLY TO ENGAGE SAID FIRST SURFACE TO PROVIDE ONE RATIO OF THE GEARING OR TO ENGAGE SAID SECOND SURFACE TO PROVIDE ANOTHER RATIO OF THE GEARING, A MECHANICAL SPRING MEANS ARRANGED TO BIAS SAID RATIO-SELECTING MEMBER TO ENGAGE THE FIRST SURFACE, SAID FIRST DEVICE ADAPTED TO MOVE SAID RATIO-SELECTING MEMBER AGAINST THE BIAS OF THE MECHANICAL SPRING MEANS TO ENGAGE THE SECOND SURFACE WHEN SAID VALVE MEANS IS OPERATED TO ITS SAID FIRST POSITION, AND THE FORCE GENERATED BY THE FIRST DEVICE WHEN THE FLUID STORED BY THE DASHPOST STARTS TO PASS THROUGH SAID FLOW RESTRICTOR IS ARRANGED TO PREVENT THE FULL ENGAGEMENT OF THE RATIOSELECTING MEMBER WITH THE FIRST SURFACE UNDER THE BIAS OF THE MECHANICAL SPRING MEANS WHEREBY THE FULL ENGAGEMENT OF THE SAID ONE RATIO WILL BE DELAYED UNTIL THE PRESSURE ACTING ON THE FIRST DEVICE HAS DECAYED TO THE SAID MINIMUM VALUE.
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) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |