US3175699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic draft gear
Assignee: ACF Industries Inc
•
Filing: 1962-03-26
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Granted: 1965-03-30
•
Expires: 1982-03-26
Abstract
No abstract record available.
Inventors
- 👤 William G Price
- 👤 Jr George E Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:54
CPC Classifications
B; B61; B61G; B61G9/00; B61G9/04; B61G9/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN A RAILROAD DRAFT GEAR POCKET, A KINETIC ENERGY ABSORBING DEVICE COMPRISING: A FLUID CONTAINING CYLINDER; A PISTON DIVIDING SAID CYLINDER INTO TWO VARIABLE VOLUME CHAMBERS, SAID PISTON HAVING A TUBULAR EXTENSION WITH RADIAL PASSAGEWAYS WHICH IN ASSOCIATION WITH PASSAGEWAYS IN SAID PISTON PROVIDED FLUID COMMUNICATION FOR SAID VARIABLE VOLUME CHAMBERS; A FLUID PRESSURE RESPONSIVE MEANS IN ONE OF SAID VARIABLE VOLUME CHAMBERS, WHICH FLUID PRESSURE RESPONSIVE MEANS CONTROLS EJECTION OF A FLUID FROM ONE OF SAID VARIABLE VOLUME CHAMBERS UPON RELIEF OF LOADS ON SAID ENERGY ABSORBING DEVICE; A SPRING LOADED VALVE IN SAID TUBULAR EXTENSION OF SAID PISTON TO RELIEVE EXCESS PRESSURES IN THE OTHER OF SAID VARIABLE VOLUME CHAMBERS BY OPENING ONE OF THE PASSAGEWAY IN SAID PISTON TO PERMIT AN INCREASED FLUID FLOW THERETHROUGH; AND MEANS MOUNTING SAID ENERGY ABSORBINT DEVICE IN AN OPERATIVE ARRANGEMENT WITHIN SAID DRAFT GEAR POCKET.
Claim 2
Dependent Claim
144 words
IN A RAILROAD DRAFT GEAR POCKET, A KINETIC ENERGY ABSORBING DEVICE COMPRISING: A FLUID CONTAINING CYLINDER; A PISTON DIVIDING SAID CYLINDER INTO TWO VARIABLE VOLUME CHAMBERS, SAID PISTON HAVING A TUBULAR EXTENSION WITH RADIAL PASSAGEWAYS WHICH IN ASSOCIATION WITH PASSAGEWAYS IN SAID PISTON PROVIDED FLUID COMMUNICATION FOR SAID VARIABLE VOLUME CHAMBERS; A FLUID PRESSURE RESPONSIVE MEANS IN ONE OF SAID VARIABLE VOLUME CHAMBERS, WHICH FLUID PRESSURE RESPONSIVE MEANS CONTROLS EJECTION OF A FLUID FROM ONE OF SAID VARIABLE VOLUME CHAMBERS UPON RELIEF OF LOADS ON SAID ENERGY ABSORBING DEVICE; A SPRING LOADED VALVE IN SAID TUBULAR EXTENSION OF SAID PISTON TO RELIEVE EXCESS PRESSURES IN THE OTHER OF SAID VARIABLE VOLUME CHAMBERS BY OPENING ONE OF THE PASSAGEWAY IN SAID PISTON TO PERMIT AN INCREASED FLUID FLOW THERETHROUGH; AND MEANS MOUNTING SAID ENERGY ABSORBINT DEVICE IN AN OPERATIVE ARRANGEMENT WITHIN SAID DRAFT GEAR POCKET.
References Cited (Backward Citations)
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US2841294A
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US2909292A
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US2963175A
Cited
US2914105A
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US2994442A
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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) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |