Hydraulic reversing system for a reciprocating working member
Abstract
Abstract A HYDRAULIC REVERSING SYSTEM FOR A RECIPROCATING WORKING MEMBER WHICH IS CONNECTED WITH A POWER CYLINDER RECEIVING A MAIN PISTON WHICH SUBDIVIDES THE CYLINDER INTO DISPACEMENT CHAMBERS. THE MAIN CONTROL VALVE COMPRISES A PISTON WITH A CENTRAL SPOOL SEPARATING TWO WORKING CHAMBERS FROM ONE ANOTHER THE WORKING CHAMBERS BEING CONNECTED TO THE DISPLACEMENT CHAMBERS OF THE MAIN CYLINDER. IN ADDITION, A PAIR OF CONTROL SPOOLS SEPARATE THE MAIN CHAMBERS OF THE VALVE FROM CONTROL CHAMBERS WHICH ARE RESPECTIVELY CONNECTED BY HYDRAULIC IMPULSE TRANSMITTERS COOPERATING WITH THE MOVABLE MEMBER FOR ALTERNATE OPERATION ON RECIPROCATION THEREOF. IMMEDIATELY UPON TRIPPING OF ONE OF THE IMPULSE GENERATORS, AND OIL FLOW FROM THE MAIN VALVE INLET TO THE CORRESPONDING CONTROL COMPARTMENT IS TERMINATED AND THE SPOON VALVE SHIFTED IN THE OPPOSITE DIRECTION TO REVERSE THE FLOW OF FLUID TO THE DISPLACEMENT COMPARTMENTS OF THE MAIN CYLINDER. AFTER AN INITIAL CLEARANCE IS FORMED IN COMMINICATION WITH THE CONTROL CHAMBER, THE MAIN HYDRAULIC PRESSURE SERVES TO BIAS THE CONTROL VALVE.
Inventors
- 👤 Paul Fuhrimann
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |