Protection device against excessive braking of a vehicle wheel braked by compressed air
Abstract
Abstract A PROTECTION DEVICE PROVIDED WITH A PRESSURE TRANSFORMER WHEREBY THE PRESSURE IN THE BRAKE CYLINDER IS ADJUSTABLE BY A DISTRIBUTOR VALVE. THE PRESSURE TRANSFORMER REVERSES THE PRESSURE BETWEEN AN UPPER AND A LOWER PRESSURE STAGE AND IS NORMALLY IN THE UPPER PRESSURE STAGE. THE PROTECTION DEVICE IS PROVIDED ALSO WITH A RELEASE MECHANISM RESPONSIVE TO EXCESSIVE BRAKING WHICH NORMALLY BY ITS OPERATION UPON THE PRESSURE TRANSFORMER TEMPORARILY REVERSES IT TO THE LOWER PRESSURE STAGE. A SAFETY DEVICE ALSO PREVENTS SUCH REVERSAL AS LONG AS THE PRESSURE IN AN AUXILIARY AIR CONTAINER IS BELOW A PREDETERMINED PRESSURE AND PREVENTS LOWERING OF THE PRESSURE IN THE BRAKING CYLINDER AFTER A PLURALITY OF SUCCEEDING OPERATIONS OF THE RELEASE MECHANISM HAS BROUGHT THE PRESSURE TO A MINIMUM VALUE.
Inventors
- 👤 Siegfried Keller
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |