Patent US3131609A successfully refreshed from Google Patents.
US3131609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parking brake control chamber
Assignee: Berg Airlectro Products Co
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Filing: 1960-11-30
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Granted: 1964-05-05
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Expires: 1980-11-30
Abstract
No abstract record available.
Inventors
- 👤 Harold L Dobrikin
- 👤 Mastis Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:51
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/08; B60T17/085; B60T17/086; B60T17/083; Y; Y10; Y10S; Y10S411/00; Y10S411/999
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A BRAKE ACTUATING MECHANISM COMPRISING A CHAMBER HAVING AN INNER WALL AND AN OUTER WALL, A PISTON IN SAID CHAMBER, A FLUID PRESSURE INLET IN SAID CHAMBER BETWEEN SAID PISTON AND SAID INNER WALL, BRAKE ACTUATING MEANS OPERATIVELY CONNECTED TO SAID PISTON AND EXTENDING THROUGH SAID INNER WALL, A COIL SPRING BETWEEN SAID OUTER WALL AND SAID PISTON TENDING TO BIAS SAID PISTON TOWARDS SAID INNER WALL IN BRAKE-APPLYING DIRECTION, PISTON-RETRACTING MEANS ROTATABLY MOUNTED IN SAID OUTER WALL AND ADAPTED TO ENGAGE SAID PISTON TO RETRACT SAID PISTON INTO SPRING-COMPRESSING RELATIONSHIP WITH SAID OUTER WALL, SAID PISTON-RETRACTING MEANS INCLUDING A COLLAR FITTING ROTATABLY MOUNTED IN SAID END WALL AND HAVING AN INTERNALLY THREADED BORE AND AN EXTERNALLY THREADED BOLT THREADED INTO SAID INTERNALLY THREADED BORE AND ADAPTED TO ENGAGE SAID PISTON UPON ROTATION OF SAID COLLAR AND LOCKING MEANS ENGAGING SAID COLLAR AND SAID BOLT AND FORMED AND ADAPTED TO PREVENT RELATIVE ROTATION THEREBETWEEN.
Claim 2
Dependent Claim
154 words
A BRAKE ACTUATING MECHANISM COMPRISING A CHAMBER HAVING AN INNER WALL AND AN OUTER WALL, A PISTON IN SAID CHAMBER, A FLUID PRESSURE INLET IN SAID CHAMBER BETWEEN SAID PISTON AND SAID INNER WALL, BRAKE ACTUATING MEANS OPERATIVELY CONNECTED TO SAID PISTON AND EXTENDING THROUGH SAID INNER WALL, A COIL SPRING BETWEEN SAID OUTER WALL AND SAID PISTON TENDING TO BIAS SAID PISTON TOWARDS SAID INNER WALL IN BRAKE-APPLYING DIRECTION, PISTON-RETRACTING MEANS ROTATABLY MOUNTED IN SAID OUTER WALL AND ADAPTED TO ENGAGE SAID PISTON TO RETRACT SAID PISTON INTO SPRING-COMPRESSING RELATIONSHIP WITH SAID OUTER WALL, SAID PISTON-RETRACTING MEANS INCLUDING A COLLAR FITTING ROTATABLY MOUNTED IN SAID END WALL AND HAVING AN INTERNALLY THREADED BORE AND AN EXTERNALLY THREADED BOLT THREADED INTO SAID INTERNALLY THREADED BORE AND ADAPTED TO ENGAGE SAID PISTON UPON ROTATION OF SAID COLLAR AND LOCKING MEANS ENGAGING SAID COLLAR AND SAID BOLT AND FORMED AND ADAPTED TO PREVENT RELATIVE ROTATION THEREBETWEEN.
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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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |