Patent US3087761A successfully refreshed from Google Patents.
US3087761A
Expired / Lapsed
US
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Brake pressure proportioning device
Assignee: ZF Active Safety US Inc
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Filing: 1961-03-03
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Granted: 1963-04-30
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Expires: 1981-03-03
Abstract
No abstract record available.
Inventors
- 👤 Stelzer William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:50
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; B60T8/28; B60T8/285; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/7722; Y10T137/7781; Y10T137/7835; Y10T137/7837; Y10T137/7869
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN A BRAKE SYSTEM HAVING A DEVICE FOR GENERATING HYDRAULIC PRESSURE AND SEPARATE LINES FOR CONDUCTING HYDRAULIC PRESSURE TO THE FRONT AND REAR WHEEL CYLINDERS, A VALVE MECHANISM IN THE LINE LEADING TO ONE SET OF WHEEL CYLINDERS, SAID VALVE MECHANISM HAVING A CHAMBER IN FIXED COMMUNICATION WITH SAID ONE SET OF WHEEL CYLINDERS, SAID VALVE MECHANISM COMPRISING A VALVE, A RESILIENT BLOCK HAVING A PASSAGE THERETHROUGH COMMUNICATING AT ONE END WITH SAID CHAMBER AND HAVING ITS OTHER END ENGAGEABLE BY SAID VALVE TO CLOSE COMMUNICATION THROUGH SAID PASSAGE, AND MEANS OPERATIVE UPON A PREDETERMINED RATE OF VEHICLE DECELERATION FOR RENDERING SAID VALVE OPERATIVE FOR CLOSING SAID PASSAGE WHEREBY PRESSURE TRANSMITTED TO SAID LINES WILL DEFORM SAID RESILIENT BLOCK AND REDUCE THE CAPACITY OF SAID CHAMBER TO DISPLACE FLUID TO SAID ONE SET OF WHEEL CYLINDERS, THE RESISTANCE OF SAID RESILIENT BLOCK TO DEFORMATION CAUSING THE PRESSURE IN SAID CHAMBER TO BE LOWER THAN THE PRESSURE TRANSMITTED TO SAID LINES.
Claim 2
Dependent Claim
160 words
IN A BRAKE SYSTEM HAVING A DEVICE FOR GENERATING HYDRAULIC PRESSURE AND SEPARATE LINES FOR CONDUCTING HYDRAULIC PRESSURE TO THE FRONT AND REAR WHEEL CYLINDERS, A VALVE MECHANISM IN THE LINE LEADING TO ONE SET OF WHEEL CYLINDERS, SAID VALVE MECHANISM HAVING A CHAMBER IN FIXED COMMUNICATION WITH SAID ONE SET OF WHEEL CYLINDERS, SAID VALVE MECHANISM COMPRISING A VALVE, A RESILIENT BLOCK HAVING A PASSAGE THERETHROUGH COMMUNICATING AT ONE END WITH SAID CHAMBER AND HAVING ITS OTHER END ENGAGEABLE BY SAID VALVE TO CLOSE COMMUNICATION THROUGH SAID PASSAGE, AND MEANS OPERATIVE UPON A PREDETERMINED RATE OF VEHICLE DECELERATION FOR RENDERING SAID VALVE OPERATIVE FOR CLOSING SAID PASSAGE WHEREBY PRESSURE TRANSMITTED TO SAID LINES WILL DEFORM SAID RESILIENT BLOCK AND REDUCE THE CAPACITY OF SAID CHAMBER TO DISPLACE FLUID TO SAID ONE SET OF WHEEL CYLINDERS, THE RESISTANCE OF SAID RESILIENT BLOCK TO DEFORMATION CAUSING THE PRESSURE IN SAID CHAMBER TO BE LOWER THAN THE PRESSURE TRANSMITTED TO SAID LINES.
References Cited (Backward Citations)
US2242297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |