Horsepower limiting hydraulic control circuit
Abstract
Abstract A HORSEPOWER LIMITING HYDRAULIC POWER TRANSMISSION SYSTEM FOR HYDRAULICALLY OPERATED LIFTING AND DIGGING EQUIPMENT INCLUDING A NUMBER OF HYDRAULIC CYLINDERS AND MOTORS FOR CONTROLLING THE VARIOUS FUNCTIONS OF THE EQUIPMENT. THE SYSTEM INCLUDES A NUMBER OF DOUBLE, FIXED VOLUME PUMP ASSEMBLIES OPERTIVELY CONNECTED TO THE MAIN ENGINE, EACH PUMP ASSEMBLY INCLUDING A HIGH VOLUME-LOW PRESSURE PUMP AND LOW VOLUME-HIGH PRESSURE PUMP, ONE HIGH VOLUME PUMP FROM EACH ASSEMBLY BEING CROSS CONNECTED TO ONE OF THE LOW VOLUME PUMPS OF ANOTHER PUMP ASSEMBLY TO PROVIDE HYDRAULIC FLUID FOR ONE OF THE CYLINDRS OR MOTORS, A PILOT OPERATED VALVE CONNECTED ACROSS EACH PAIR OF CROSS CONNECTED PUMPS, EACH OF THE VALVES IS RESPONSIVE TO THE PRESSURE OF THE LOW VOLUMEHIGH PRESSURE PUMP TO BYPASS THE FLUID FROM THE HIGH VOLUME-LOW PRESSURE PUMP TO THE RESERVOIR. A DOUBLE ACTING HYDRAULICALLY ACTUATED VALVE IS INCLUDED AND IS RESPONSIVE TO THE PRESSURE OF EITHER OF TWO LOW VOLUME PUMPS TO SIMULTANEOUSLY BY-PASS BOTH CORRESPONDING HIGH VOLUME PUMPS AND THEREBY SIMULTANEOUSLY SHIFT TWO OPERATING FUNCTIONS FROM HIGH HORSEPOWER TO LOW HORSEPOWER OPERATION.
Inventors
- 👤 Richard O Gordon
Bibliographic Details
Claims Analysis
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |