US3280945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tread brake assembly
Assignee: Westinghouse Air Brake Co
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Filing: 1964-11-09
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Granted: 1966-10-25
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Expires: 1984-11-09
Abstract
No abstract record available.
Inventors
- 👤 Willard P Spalding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:49
CPC Classifications
B; B61; B61H; B61H1/00; B61H1/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
A BRAKE ASSEMBLY FOR A RAILWAY CAR TRUCK WHEEL COMPRISING, IN COMBINATION: (A) A SUPPORT MEANS, (B) TWO LEVERS RESPECTIVELY PIVOTED ON SAID SUPPORT MEANS, ONE BEING PIVOTALLY MOUNTED ADJACENT ONE END THEREOF AND THE OTHER BEING PIVOTALLY MOUNTED INTERMEDIATE ITS ENDS, (C) A BRAKE-SHOE-CARRYING BRAKE HEAD OPERATIVELY CONNECTED TO SAID ONE PIVOTED LEVER ADJACENT THE OTHER END THEREOF, (D) FLUID POWER MEANS COMPRISING: (I) A CYLINDER PIVOTALLY CONNECTED TO SAID ONE PIVOTED LEVER INTERMEDIATE THE ENDS THEREOF, AND (II) A PISTON SLIDABLY MOUNTED IN SAID CYLINDER, SAID PISTON COOPERATING WITH SAID CYLINDER TO FORM A CHAMBER AND HAVING A STEM PIVOTED AT ONE END TO SAID PISTON AND AT THE OPPOSITE END TO ONE END OF THE OTHER OF SAID PIVOTED LEVERS, (E) SPRING MEANS INTERPOSED BETWEEN SAID SUPPORT MEANS AND SAID ONE END OF SAID OTHER PIVOTED LEVER AND EFFECTIVE IN THE ABSENCE OF FLUID UNDER PRESSURE IN SAID CHAMBER, VIA SAID STEM, PISTON, CYLINDER AND ONE LEVER, TO CONSTANTLY BIAS THE BRAKE SHOE CARRIED BY SAID BRAKE-SHOE-CARRYING BRAKE HEAD INTO LIGHT BRAKING CONTACT WITH THE TREAD SURFACE OF THE CORRESPONDING RAILWAY CAR TRUCK WHEEL, AND
Claim 2
Dependent Claim
188 words
A BRAKE ASSEMBLY FOR A RAILWAY CAR TRUCK WHEEL COMPRISING, IN COMBINATION: (A) A SUPPORT MEANS, (B) TWO LEVERS RESPECTIVELY PIVOTED ON SAID SUPPORT MEANS, ONE BEING PIVOTALLY MOUNTED ADJACENT ONE END THEREOF AND THE OTHER BEING PIVOTALLY MOUNTED INTERMEDIATE ITS ENDS, (C) A BRAKE-SHOE-CARRYING BRAKE HEAD OPERATIVELY CONNECTED TO SAID ONE PIVOTED LEVER ADJACENT THE OTHER END THEREOF, (D) FLUID POWER MEANS COMPRISING: (I) A CYLINDER PIVOTALLY CONNECTED TO SAID ONE PIVOTED LEVER INTERMEDIATE THE ENDS THEREOF, AND (II) A PISTON SLIDABLY MOUNTED IN SAID CYLINDER, SAID PISTON COOPERATING WITH SAID CYLINDER TO FORM A CHAMBER AND HAVING A STEM PIVOTED AT ONE END TO SAID PISTON AND AT THE OPPOSITE END TO ONE END OF THE OTHER OF SAID PIVOTED LEVERS, (E) SPRING MEANS INTERPOSED BETWEEN SAID SUPPORT MEANS AND SAID ONE END OF SAID OTHER PIVOTED LEVER AND EFFECTIVE IN THE ABSENCE OF FLUID UNDER PRESSURE IN SAID CHAMBER, VIA SAID STEM, PISTON, CYLINDER AND ONE LEVER, TO CONSTANTLY BIAS THE BRAKE SHOE CARRIED BY SAID BRAKE-SHOE-CARRYING BRAKE HEAD INTO LIGHT BRAKING CONTACT WITH THE TREAD SURFACE OF THE CORRESPONDING RAILWAY CAR TRUCK WHEEL, AND
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |