US3671087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable load relay valve with belleville spring type lock for exhaust valve seat positioned according to load
Assignee: Westinghouse Bremsen und Apparatebau GmbH
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Filing: 1970-10-28
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Granted: 1972-06-20
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Expires: 1990-10-28
Abstract
Abstract THIS INVENTION RELATES TO A FLUID PRESSURE OPERATED BELLEVILLE SPRING TYPE LOCK FOR A HOLLOW SLEEVE MEMBER AT ONE END OF WHICH IS FORMED THE EXHAUST VALVE SEAT OF A PARABOLOIDAL TYPE SELF-LAPPING VARIABLE LOAD RELAY VALVE THIS HOLLOW SLEEVE IS ARRANGED TO BE HELD IN A POSITION TO WHICH IT MAY BE ADJUSTED ACCORDING TO THE LOAD ON A VEHICLE BY THE GRIPPING ACTION OF THE INNER PERIPHERY OF THE SMALLER END OF A BELLEVILLE SPRING IN RESPONSE TO A FLUID PRESSURE FORCE APPLIED TO THE LARGER END BY A PISTON SUBJECT TO THE DELIVERY PRESSURE SUPPLIED BY THE RELAY VALVE TO ONE OR MORE BRAKE CYLINDERS FOR EFFECTING A BRAKE APPLICATION ON THE VEHICLE.
Inventors
- 👤 Ewald Pekrul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:29
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/18; B60T8/1812; B60T8/1825
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |