US3620133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat dissipating bearing with wear compensating means
Assignee: Westinghouse Air Brake Co
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Filing: 1970-01-09
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Granted: 1971-11-16
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Expires: 1990-01-09
Abstract
Abstract A BUSHING TYPE SHAFT BEARING FOR USE IN THE PISTON OF A PERCUSSION DRILL COMPRISING SPACED PLASTIC BEARING ELEMENTS DISPOSED IN SOLTS IN A METALLIC HEAT CONDUCTIVE RETAINER. THE RETAINER DISSIPATES FRICTIONAL HEAT DEVELOPED IN THE PLASTIC, AND ALSO REINFORCES THE PLASTIC AGAINST WARPAGE, DEFORMATION OR COLD FLOW OUT OF THE SLOTS. THE RETAINER BEING THREADED INTO THE PISTON SO THAT AN ENDMOST ELEMENT FORCIBLY ABUTS AGAINST A PISTON SURFACE TO APPLY AN AXIAL SQUEEZING FORCE ON THE TRAPPED ELEMENTS.
Inventors
- 👤 Jacob E Feucht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:49
CPC Classifications
F; F16; F16C; F16C31/00; F16C31/02; F16C17/00; F16C17/02; F16C29/00; F16C29/02; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C2202/00; F16C2202/50; F16C2208/00; F16C2208/20; F16C2208/30; F16C2208/32; F16C2208/60
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |