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US3347320A
Expired / Lapsed
US
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Rotor system
Assignee: Bell Aerospace Corp
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Filing: 1966-07-06
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Granted: 1967-10-17
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Expires: 1986-07-06
Abstract
No abstract record available.
Inventors
- 👤 Wesley L Cresap
- 👤 Robert R Lynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:42
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/37; B64C27/41; B64C27/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A ROTARY WING AIRCRAFT, A ROTOR MAST, AN ELONGATE ROTOR HUB HAVING A CENTRALLY DISPOSED MOUNTING PORTION, MEANS SECURING THE MOUNTING PORTION OF SAID HUB TO SAID MAST FOR ROTATION THEREWITH AND FOR ROCKING MOTION RELATIVE THERETO ABOUT AN AXIS TRANSVERSE OF SAID HUB AND NORMAL TO THE MAST, SAID HUB ALSO INCLUDING A PAIR OF FLEXIBLE PLATE PORTIONS PROJECTING IN OPPOSITE DIRECIONS FROM SAID MOUNTING PORTION, AND A ROTOR BLADE MOUNTING PORTION AT THE FREE END OF EACH FLEXURE PLATE PORTION, SAID FLEXURE PLATE PORTIONS BEING DIMENSIONED TO FLEX ABOUT VIRTUAL AXES PARALLEL TO AND DISPLACED OUTWARDLY FROM THE ROCKING AXIS OF SAID HUB, A PAIR OF ROTOR BLADES,
Claim 2
Dependent Claim
111 words
IN A ROTARY WING AIRCRAFT, A ROTOR MAST, AN ELONGATE ROTOR HUB HAVING A CENTRALLY DISPOSED MOUNTING PORTION, MEANS SECURING THE MOUNTING PORTION OF SAID HUB TO SAID MAST FOR ROTATION THEREWITH AND FOR ROCKING MOTION RELATIVE THERETO ABOUT AN AXIS TRANSVERSE OF SAID HUB AND NORMAL TO THE MAST, SAID HUB ALSO INCLUDING A PAIR OF FLEXIBLE PLATE PORTIONS PROJECTING IN OPPOSITE DIRECIONS FROM SAID MOUNTING PORTION, AND A ROTOR BLADE MOUNTING PORTION AT THE FREE END OF EACH FLEXURE PLATE PORTION, SAID FLEXURE PLATE PORTIONS BEING DIMENSIONED TO FLEX ABOUT VIRTUAL AXES PARALLEL TO AND DISPLACED OUTWARDLY FROM THE ROCKING AXIS OF SAID HUB, A PAIR OF ROTOR BLADES,
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |