US3242824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic power steering system
Assignee: ZF Friedrichshafen AG
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Filing: 1963-07-31
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Granted: 1966-03-29
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Expires: 1983-07-31
Abstract
No abstract record available.
Inventors
- 👤 Jablonsky Erich
- 👤 Wagner Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:10
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/02; F15B9/08; B; B62; B62D; B62D1/00; B62D1/02; B62D1/16; B62D5/00; B62D5/06; B62D5/20; B62D5/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
A BOOSTER STEERING MECHANISM COMPRISING A DOUBLEENDED PISTON FOR ACTUATION OF A STEERING MECHANISM AND A STEERING COLUMN HAVING A THREADED DRIVE CONNECTION WITH SAID PISTON; A LOST MOTION MECHANISM CONNECTED TO SAID COLUMN AND HAVING AN INTEGRAL FLANGE MOVABLE THEREWITH AND SAID COLUMN BEING SUPPORTED FOR ROTATIVE AND AXIAL MOVEMENT WHEREIN LOST MOTION AXIAL MOVEMENT IS EFFECTED UPON INITIAL ROTATION OF SAID COLUMN, A PRESSURE CHAMBER FOR EACH END OF SAID PISTON, A VALVE MEANS DISPOSED FOR OPERATION BY SAID FLANGE TO SELECTIVELY CONTROL PRESSURE OF SAID CHAMBERS RESPONSIVE TO DIRECTION OF AXIAL MOVEMENT OF SAID COLUMN, SAID LOST MOTION MECHANISM FURTHER COMPRISING RESILIENT ELEMENTS DISPOSED TO ACT ON BOTH SIDES OF SAID FLANGE FOR EFFECTING AN INITIAL CENTERED CONDITION OF SAID STEERING COLUMN, SAID VALVE MEANS COMPRISING A VALVE SLEEVE CONCENTRICALLY ARRANGED ABOUT SAID STEERING COLUMN AND CARRIED THEREBY FOR MOVEMENT THEREWITH, SAID STEERING COLUMN HAVING MOUNTING MEANS PERMITTING LIMITED FREE MOVEMENT THEREOF, WHEREBY SAID RESILIENTLY ELEMENTS MAY EFFECT SAID CENTERED CONDITION TO NEUTRALLY POSITION SAID VALVE SLEEVE WHEREAT NO PRESSURE IS EFFECTED THEREBY IN EITHER CHAMBER FOR MOVING SAID PISTON.
Claim 2
Dependent Claim
183 words
A BOOSTER STEERING MECHANISM COMPRISING A DOUBLEENDED PISTON FOR ACTUATION OF A STEERING MECHANISM AND A STEERING COLUMN HAVING A THREADED DRIVE CONNECTION WITH SAID PISTON; A LOST MOTION MECHANISM CONNECTED TO SAID COLUMN AND HAVING AN INTEGRAL FLANGE MOVABLE THEREWITH AND SAID COLUMN BEING SUPPORTED FOR ROTATIVE AND AXIAL MOVEMENT WHEREIN LOST MOTION AXIAL MOVEMENT IS EFFECTED UPON INITIAL ROTATION OF SAID COLUMN, A PRESSURE CHAMBER FOR EACH END OF SAID PISTON, A VALVE MEANS DISPOSED FOR OPERATION BY SAID FLANGE TO SELECTIVELY CONTROL PRESSURE OF SAID CHAMBERS RESPONSIVE TO DIRECTION OF AXIAL MOVEMENT OF SAID COLUMN, SAID LOST MOTION MECHANISM FURTHER COMPRISING RESILIENT ELEMENTS DISPOSED TO ACT ON BOTH SIDES OF SAID FLANGE FOR EFFECTING AN INITIAL CENTERED CONDITION OF SAID STEERING COLUMN, SAID VALVE MEANS COMPRISING A VALVE SLEEVE CONCENTRICALLY ARRANGED ABOUT SAID STEERING COLUMN AND CARRIED THEREBY FOR MOVEMENT THEREWITH, SAID STEERING COLUMN HAVING MOUNTING MEANS PERMITTING LIMITED FREE MOVEMENT THEREOF, WHEREBY SAID RESILIENTLY ELEMENTS MAY EFFECT SAID CENTERED CONDITION TO NEUTRALLY POSITION SAID VALVE SLEEVE WHEREAT NO PRESSURE IS EFFECTED THEREBY IN EITHER CHAMBER FOR MOVING SAID PISTON.
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) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |