Device for adjusting the stroke of a variable displacement pump to maintain the product of pressure and volume per stroke constant
Abstract
Abstract A DEVICE FOR ADJUSTING THE STROKE OF A VARIABLE DISPLACEMENT PUMP TO KEEP THE PRODUCT OF THE PRESSURE AND VOLUME PER STROKE CONSTANT, COMPRISES A FLUID PRESSURE ACTUATED ADJUSTING MEMBER FOR VARYING THE VOLUME PER STROKE OF THE PUMP, THE FLOW OF FLUID TO THE ADJUSTING MEMBER BEING CONTROLLED BY A SPOOL VALVE, AN AUXILIARY MEMBER MOUNTED ON A PIVOT, THE PIVOT BEING CARRIED BY AND MOVABLE WITH THE ADJUSTING MEMBER, THE AUXILIARY MEMBER BEING URGED TO TURN ABOUT THE PIVOT IN ONE DIRECTION BY EQUALISING MEANS SUBJECTING SAID MEMBER TO A REDETERMINED SUBSTANTIALLY CONSTANT MOMENT, THE SPOOL OF THE SPOOL VALVE BEING ADAPTED TO TRANSMIT A FORCE TO THE AUXILIARLY MEMBER PROPORTIONAL TO THE PUMP OUTPUT PRESSURE, THE MOMENT OF SAID FORCE OPPOSING THE MOMENT OF THE EQUALISING MEMBER, THE MOMENT OF THE FORCE VARYING WITH THE MOVEMENT OF THE PIVOT IN PROPORTION TO THE VOLUME PER STROKE.
Inventors
- 👤 Gunter Schlinke
Bibliographic Details
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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 |