US3147046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake pressure proportioning device
Assignee: ZF Active Safety US Inc
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Filing: 1961-12-18
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Granted: 1964-09-01
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Expires: 1981-12-18
Abstract
No abstract record available.
Inventors
- 👤 Stelzer William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:57
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; Y; Y10; Y10T; Y10T137/00; Y10T137/0753
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
213 words
A BRAKE PRESSURE CONTROL DEVICE FOR USE IN A VEHICLE HYDRAULIC BRAKE SYSTEM INCLUDING A HOUSING HAVING AN INLET OPENING ADAPTED TO BE CONNECTED TO A SOURCE OF FLUID PRESSURE, AN OUTLET OPENING ADAPTED TO BE CONNECTED TO A BRAKE CYLINDER AND A BORE IN FLUID COMMUNICATION BETWEEN SAID OPENINGS, SAID BORE HAVING A SMALL DIAMETER PORTION AND A LARGE DIAMETER PORTION; A PISTON IN SAID BORE HAVING A SMALL DIAMETER PORTION SLIDABLE IN SAID SMALL DIAMETER BORE PORTION AND A LARGE DIAMETER PORTION SLIDABLE IN SAID LARGE DIAMETER BORE PORTION, AND A SHOULDER INTERMEDIATE SAID PISTON PORTIONS; MEANS PROVIDING AN OPENING FOR THE PASSAGE OF FLUID FROM SAID INLET OPENING TO SAID OUTLET OPENING PAST SAID PISTON; MEANS FOR CLOSING SAID LAST NAMED OPENING UPON THE OCCURRENCE OF PREDETERMINED CONDITIONS DURING BRAKE APPLICATION; AND A RESILIENT SEAL PROVIDING A SEALED CONNECTION BETWEEN AT LEAST ONE OF SAID PISTON PORTIONS AND THE BORE PORTION IN WHICH IT IS SLIDABLE, SAID AT LEAST ONE PISTON PORTION BEING RECESSED ADJACENT SAID SEAL TO PERMIT LIMITED MOVEMENT OF SAID SEAL IN A DIRECTION TOWARD SAID SHOULDER UNDER THE INFLUENCE OF FLUID PRESSURE WHEREBY FLUID BETWEEN SAID SHOULDER AND SAID SEAL WILL BE PRESSURIZED BY MOVEMENT OF SAID SEAL TO APPLY A FLUID PRESSURE AGAINST SAID SHOULDER.
Claim 2
Dependent Claim
213 words
A BRAKE PRESSURE CONTROL DEVICE FOR USE IN A VEHICLE HYDRAULIC BRAKE SYSTEM INCLUDING A HOUSING HAVING AN INLET OPENING ADAPTED TO BE CONNECTED TO A SOURCE OF FLUID PRESSURE, AN OUTLET OPENING ADAPTED TO BE CONNECTED TO A BRAKE CYLINDER AND A BORE IN FLUID COMMUNICATION BETWEEN SAID OPENINGS, SAID BORE HAVING A SMALL DIAMETER PORTION AND A LARGE DIAMETER PORTION; A PISTON IN SAID BORE HAVING A SMALL DIAMETER PORTION SLIDABLE IN SAID SMALL DIAMETER BORE PORTION AND A LARGE DIAMETER PORTION SLIDABLE IN SAID LARGE DIAMETER BORE PORTION, AND A SHOULDER INTERMEDIATE SAID PISTON PORTIONS; MEANS PROVIDING AN OPENING FOR THE PASSAGE OF FLUID FROM SAID INLET OPENING TO SAID OUTLET OPENING PAST SAID PISTON; MEANS FOR CLOSING SAID LAST NAMED OPENING UPON THE OCCURRENCE OF PREDETERMINED CONDITIONS DURING BRAKE APPLICATION; AND A RESILIENT SEAL PROVIDING A SEALED CONNECTION BETWEEN AT LEAST ONE OF SAID PISTON PORTIONS AND THE BORE PORTION IN WHICH IT IS SLIDABLE, SAID AT LEAST ONE PISTON PORTION BEING RECESSED ADJACENT SAID SEAL TO PERMIT LIMITED MOVEMENT OF SAID SEAL IN A DIRECTION TOWARD SAID SHOULDER UNDER THE INFLUENCE OF FLUID PRESSURE WHEREBY FLUID BETWEEN SAID SHOULDER AND SAID SEAL WILL BE PRESSURIZED BY MOVEMENT OF SAID SEAL TO APPLY A FLUID PRESSURE AGAINST SAID SHOULDER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |