Empty-load relay valve device
Abstract
Abstract THIS INVENTION RELATES TO A RAILWAY VEHICLE RELAY VALVE DEVICE FOR INTERPOSITION BETWEEN A BRAKE CONTROL PIPE AND A BRAKE CYLINDER AND INCLUDES A MECHANISM ADJUSTABLE ACCORDING TO THE LOAD CARRIED BY THE VEHICLE TO SO CONDITION THE RELAY VALVE DEVICES THAT ITS OPERATION BY FLUID UNDER PRESSURE FROM THE BRAKE CONTROL PIPE ALWAYS, PROVIDES A SUPPLY OF FLUID PRESSURE TO THE BRAKE CYLINDER, THE VALUE OF WHICH IS IN ACCORDANCE WITH THE WEIGHT OF THE LOAD CARRIED BY A SPRING-SUPPORTED (OR SPRUNG) PART OF THE VEHICLE BETWEEN WHICH AND AN UNSPRUNG PART, THE RELAY VALVE DEVICE IS INTERPOSED FOR EFFECTING OPERATION OF THE LOAD-MEASURING MECHANISM THEREOF IN ACCORDANCE WITH CHANGES IN THE LOAD CARRIED BY THE SPRING-SUPPORTED PART.
Inventors
- 👤 Daniel G Scott
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) | 1974-09-19 | 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 |