US3120881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway tread brake arrangement
Assignee: Amsted Industries Inc
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Filing: 1962-04-05
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Granted: 1964-02-11
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Expires: 1982-04-05
Abstract
No abstract record available.
Inventors
- 👤 Louis D Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:58
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/18; B60T8/1893; B61; B61H; B61H13/00; B61H13/20; B61H13/24; B61H13/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN A TREAD BRAKE ARRANGEMENT FOR A FOUR WHEEL RAILWAY CAR TRUCK HAVING A BOLSTER RESILIENTLY SUPPORTED ON SIDE FRAMES MOUNTED ON WHEEL AND AXLE ASSEMBLIES, TWO BRAKE BEAMS SLIDABLY SUPPORTED ON THE SIDE FRAMES BETWEEN SAID ASSEMBLIES, BRAKE SHOES ON SAID BEAMS FOR FRICTIONAL ENGAGEMENT AGAINST SAID ASSEMBLIES, A DEAD BRAKE LEVER PIVOTALLY CONNECTED AT ITS LOWER END TO ONE OF SAID BRAKE BEAMS, A LINK PIVOTALLY CONNECTING THE UPPER END OF SAID DEAD BRAKE TO THE BOLSTER, A LIVE BRAKE LEVER PIVOTALLY CONNECTED AT ITS LOWER END TO THE OTHER OF SAID BRAKE BEAMS, A PUSH ROD SLIDEABLY MOUNTED ON SAID BOLSTER AND INTERPOSED BETWEEN MEDIAL PORTIONS OF THE BRAKE LEVERS TO PROVIDE VARIABLE FULCRUM POINTS FOR THE LATTER, AND ACTUATING MEANS CONNECTED TO THE UPPER END OF THE LIVE BRAKE LEVER.
Claim 2
Dependent Claim
134 words
IN A TREAD BRAKE ARRANGEMENT FOR A FOUR WHEEL RAILWAY CAR TRUCK HAVING A BOLSTER RESILIENTLY SUPPORTED ON SIDE FRAMES MOUNTED ON WHEEL AND AXLE ASSEMBLIES, TWO BRAKE BEAMS SLIDABLY SUPPORTED ON THE SIDE FRAMES BETWEEN SAID ASSEMBLIES, BRAKE SHOES ON SAID BEAMS FOR FRICTIONAL ENGAGEMENT AGAINST SAID ASSEMBLIES, A DEAD BRAKE LEVER PIVOTALLY CONNECTED AT ITS LOWER END TO ONE OF SAID BRAKE BEAMS, A LINK PIVOTALLY CONNECTING THE UPPER END OF SAID DEAD BRAKE TO THE BOLSTER, A LIVE BRAKE LEVER PIVOTALLY CONNECTED AT ITS LOWER END TO THE OTHER OF SAID BRAKE BEAMS, A PUSH ROD SLIDEABLY MOUNTED ON SAID BOLSTER AND INTERPOSED BETWEEN MEDIAL PORTIONS OF THE BRAKE LEVERS TO PROVIDE VARIABLE FULCRUM POINTS FOR THE LATTER, AND ACTUATING MEANS CONNECTED TO THE UPPER END OF THE LIVE BRAKE LEVER.
References Cited (Backward Citations)
DE631803C
Cited
US2815092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-10 | 1967-08-12 | 1968-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-10 | 1971-08-12 | 1972-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-10 | 1975-08-12 | 1976-02-11 | $7700.00 | Window Closed / Lapsed |