US3394721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control means for varying the position of a member in response to changes in the ratio of two pressures
Assignee: ZF International UK Ltd
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Filing: 1966-03-29
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Granted: 1968-07-30
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Expires: 1986-03-29
Abstract
No abstract record available.
Inventors
- 👤 Ifield Richard Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:08
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
CONTROL MEANS FOR VARYING THE POSITION OF A MEMBER IN RESPONSE TO CHANGES IN THE RATIO OF TWO FLUID PRESSURES COMPRISING, IN COMBINATION, A BODY PART, A HOLLOW LEVER PIVOTALLY MOUNTED IN THE BODY PART, MEANS FOR SUPPLYING FLUID UNDER PRESSURE TO THE INTERIOR OF THE LEVER WHICH HAS AN OUTLET AT A POSITION REMOTE FROM ITS PIVOT, TWO FLUID PRESSUE RESPONSIVE DIVICES ARRANGED TO TRANSLATE THE TWO FLUID PRESSURES RESPECTIVELY INTO FORCES ACTING IN OPPOSITE DIRECTIONS TO MOVE THE LEVER ANGULARLY ABOUT ITS PIVOT, THE BODY PART HAVING A PAIR OF ORIFICES TO RECEIVE FLUID UNDER PRESSURE FROM THE OUTLET OF THE HOLLOW LEVER, IN PROPORTIONS DEPENDENT UPON THE ANGULAR POSITION OF THE LEVER, AND MEANS RESPONSIVE TO DIFFERENTIAL PRESSURES AT SAID ORIFICES FOR VARYING THE LEVERAGE WHICH ONE OF SAID PRESSURE RESPONSIVE DEVICES EXERTS ON THE HOLLOW LEVER, SAID MEANS BEING OPERATIVELY CONNECTED TO THE MEMBER.
Claim 2
Dependent Claim
148 words
CONTROL MEANS FOR VARYING THE POSITION OF A MEMBER IN RESPONSE TO CHANGES IN THE RATIO OF TWO FLUID PRESSURES COMPRISING, IN COMBINATION, A BODY PART, A HOLLOW LEVER PIVOTALLY MOUNTED IN THE BODY PART, MEANS FOR SUPPLYING FLUID UNDER PRESSURE TO THE INTERIOR OF THE LEVER WHICH HAS AN OUTLET AT A POSITION REMOTE FROM ITS PIVOT, TWO FLUID PRESSUE RESPONSIVE DIVICES ARRANGED TO TRANSLATE THE TWO FLUID PRESSURES RESPECTIVELY INTO FORCES ACTING IN OPPOSITE DIRECTIONS TO MOVE THE LEVER ANGULARLY ABOUT ITS PIVOT, THE BODY PART HAVING A PAIR OF ORIFICES TO RECEIVE FLUID UNDER PRESSURE FROM THE OUTLET OF THE HOLLOW LEVER, IN PROPORTIONS DEPENDENT UPON THE ANGULAR POSITION OF THE LEVER, AND MEANS RESPONSIVE TO DIFFERENTIAL PRESSURES AT SAID ORIFICES FOR VARYING THE LEVERAGE WHICH ONE OF SAID PRESSURE RESPONSIVE DEVICES EXERTS ON THE HOLLOW LEVER, SAID MEANS BEING OPERATIVELY CONNECTED TO THE MEMBER.
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) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |