Hydraulic pump
Abstract
Abstract A VARIABLE DISPLACEMENT HYDRAULIC PUMP OF THE MULTIPLE PISTON TYPE HAVING A FLUID OPERABLE BIASING PISTON FOR BIASING THE PUMP TOWARD MAXIMUM DISPLACEMENT, A CONTROL VALVE FOR CONTROLLING THE FLUID PRESSURE IN A DISPLACEMENT CONTROL MOTOR OPPOSING THE BIASING PISTON, AND A CHARGE RELIEF VALVE THAT OPERATES ON A PRIORITY BASIS IN THE LOW PRESSURE SIDE OF THE HYDRAULIC CIRCUIT IN CONJUNCTION WITH A CHARGE PUMP TO SEQUENTIALLY (1) SUPPLY FLUID TO THE LOW PRESSURE SIDE OF THE MAIN PUMP IN OPEN CIRCUIT, (2) SUPPLY HYDRAULIC FLUID TO THE BIASING PISTON, (3) SUPPLY COOLING OIL FOR THE ROTATING COMPONENTS OF THE PUMP, AND (4) PROVIDE A BYPASS RELIEF DIRECTLY TO THE INLET OF THE CHARGE PUMP.
Inventors
- 👤 Harry C Moon Jr
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |