Patent US3216534A successfully refreshed from Google Patents.
US3216534A
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Automatic adjusting devices for internal expanding shoe drum brakes
Assignee: Whitnash PLC
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Filing: 1964-01-17
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Granted: 1965-11-09
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Expires: 1984-01-17
Abstract
No abstract record available.
Inventors
- 👤 Leslie C Chouings
- 👤 Wallace M J Cairns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:10
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/561; F16D65/562; F16D2125/00; F16D2125/18; F16D2125/58; F16D2125/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
AN AUTOMATIC ADJUSTING DEVICE FOR A BRAKE COMPRISING BRAKE SHOE MEMBERS, BRAKE ACCTUATING MEANS FOR SAID SHOE MEMBERS INCLUDING A THRUST MEMBER DISPOSED FOR MOVEMENT IN A DIRECTION TOWARD ONE OF SAID BRAKE SHOE MEMBERS TO APPLY A BRAKE ACTION, A THREADED STEM MEMBER THREADABLY ENGAGING SAID THRUST MEMBER, A TOOTHED WHEEL FIXED TO SAID THRUST MEMBER, A BRACKET MEMBER FIXED TO SAID ACTUATING MEANS, A PIVOT PIN CARRIED BY SAID BRACKET MEMBER, A PAWL PIVOTALLY MOUNTED ON SAID PIN AND HAVING ITS OPPOSITE END ADAPTED TO ENGAGE SAID THRUST MEMBER TOOTHED WHEEL, AN ARM FIXED AT ONE END TO SAID THRUST MEMBER AND MOVABLE THEREWITH, A FOLLOWER PIN DISPOSED ON THE OTHER END OF SAID ARM, CAM MEANS ON SAID PAWL, AND SAID FOLLOWER PIN DISPOSED TO RIDE ALONG SAID CAM MEANS TO PIVOT SAID PAWL ABOUT SAID PIVOT PIN TO MOVE SAID STEM MEMBER RELATIVE TO SAID THRUST MEMBER TO INCREASE THE OVERALL LENGTH OF SAID STEM AND THRUST MEMBER TO ADJUST SAID BRAKES.
Claim 2
Dependent Claim
166 words
AN AUTOMATIC ADJUSTING DEVICE FOR A BRAKE COMPRISING BRAKE SHOE MEMBERS, BRAKE ACCTUATING MEANS FOR SAID SHOE MEMBERS INCLUDING A THRUST MEMBER DISPOSED FOR MOVEMENT IN A DIRECTION TOWARD ONE OF SAID BRAKE SHOE MEMBERS TO APPLY A BRAKE ACTION, A THREADED STEM MEMBER THREADABLY ENGAGING SAID THRUST MEMBER, A TOOTHED WHEEL FIXED TO SAID THRUST MEMBER, A BRACKET MEMBER FIXED TO SAID ACTUATING MEANS, A PIVOT PIN CARRIED BY SAID BRACKET MEMBER, A PAWL PIVOTALLY MOUNTED ON SAID PIN AND HAVING ITS OPPOSITE END ADAPTED TO ENGAGE SAID THRUST MEMBER TOOTHED WHEEL, AN ARM FIXED AT ONE END TO SAID THRUST MEMBER AND MOVABLE THEREWITH, A FOLLOWER PIN DISPOSED ON THE OTHER END OF SAID ARM, CAM MEANS ON SAID PAWL, AND SAID FOLLOWER PIN DISPOSED TO RIDE ALONG SAID CAM MEANS TO PIVOT SAID PAWL ABOUT SAID PIVOT PIN TO MOVE SAID STEM MEMBER RELATIVE TO SAID THRUST MEMBER TO INCREASE THE OVERALL LENGTH OF SAID STEM AND THRUST MEMBER TO ADJUST SAID BRAKES.
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |