Booster steering control device
Abstract
Abstract THE INVENTION COMPRISES A VALVE ARRAY FOR HYDRAULIC SERVOMOTOR BOOSTER STEERING SYSTEMS OF THE TYPE WHICH USES A CONTROL OR A METERING PUMP TO CONTROL FLOW FROM A MAIN PUMP WHEREIN THE MAIN PUMP FLOW PASSES THROUGH THE METERING PUMP. IN THE PRESENT CONSTRUCTION PRESSURE FLOW TO A DOUBLE ENDED HYDRAULIC CYLINDER, AND AN EXHAUST THEREFROM IS CONTROLLED BY A PAIR OF COACTING RECIPROCAL PISTON VALVES WHICH ARE SHIFTED BY THE MANUAL TORQUE OF ROTATING A VEHICLE STEERING WHEEL. SUCH SHIFTING OF THE PISTON VALVES IS EFFECTIVE WITHIN PREDETERMINED LIMITS OF MOVEMENT AND MEANS ARE PROVIDED IN CONJUNCTION WITH ONE OF THE PISTON VALVES FOR EFFECTING ROAD REACTION, THAT IS, A SIMULATED STEERING RESISTANCE TO ROTATION OF THE STEERING WHEEL WHICH IS PROPORTIONAL TO THE WORKING PRESSURE IN THE SERVOMOTOR.
Inventors
- 👤 Karl-Heinz Liebert
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |