US3082826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor head with collective pitch control
Assignee: Doman Helicopters Inc
•
Filing: 1958-07-02
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Granted: 1963-03-26
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Expires: 1978-07-02
Abstract
No abstract record available.
Inventors
- 👤 Glidden S Doman
- 👤 Pont Stephen Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:59
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A ROTOR MECHANISM FOR A HELICOPTER COMPRISING A FRAME, A HOLLOW DRIVE SHAFT ROTATABLY MOUNTED IN THE FRAME, A BALL JOINT INCLUDING A BALL ON THE END OF THE DRIVE SHAFT AND BEARINGS CARRIED BY THE BALL BOTH OF WHICH ARE ROTATABLE WITH THE DRIVE SHAFT, A ROTOR INCLUDING A ROTOR HUB MOUNTED ON THE BALL JOINT FOR FREE TILTING THEREON, AN AXIALLY FLEXIBLE AND ESSENTIALLY CIRCUMFERENTIALLY INFLEXIBLE SLEEVE DRIVING CONNECTION DIRECTLY CONNECTED BETWEEN THE DRIVE SHAFT AND THE ROTOR HUB ON THE FRAME SIDE OF THE HUB, THE SLEEVE COMPLETELY ENCLOSING THE SIDE OF THE HUB, BLADES EACH HAVING A LONGITUDINAL AXIS AND MOUNTED ON THE ROTOR HUB SOLELY FOR OSCILLATING MOVEMENT ON ITS LONGITUDINAL AXIS FOR PITCH VARIATION, EACH BLADE HAVING A SPAR THE END OF WHICH PROJECTS INTO THE HUB, A HORN ON THE END OF EACH BLADE, A PITCH CHANGE ROD PASSING THROUGH THE HOLLOW DRIVE SHAFT AND THE BALL JOINT AND PROJECTING FROM EACH END OF THE LATTER, MEANS MOUNTING THE PITCH CHANGE ROD FOR MOVEMENT AXIALLY WITHIN THE HOLLOW DRIVE SHAFT, PITCH CHANGE MEANS CON-
Claim 2
Dependent Claim
181 words
A ROTOR MECHANISM FOR A HELICOPTER COMPRISING A FRAME, A HOLLOW DRIVE SHAFT ROTATABLY MOUNTED IN THE FRAME, A BALL JOINT INCLUDING A BALL ON THE END OF THE DRIVE SHAFT AND BEARINGS CARRIED BY THE BALL BOTH OF WHICH ARE ROTATABLE WITH THE DRIVE SHAFT, A ROTOR INCLUDING A ROTOR HUB MOUNTED ON THE BALL JOINT FOR FREE TILTING THEREON, AN AXIALLY FLEXIBLE AND ESSENTIALLY CIRCUMFERENTIALLY INFLEXIBLE SLEEVE DRIVING CONNECTION DIRECTLY CONNECTED BETWEEN THE DRIVE SHAFT AND THE ROTOR HUB ON THE FRAME SIDE OF THE HUB, THE SLEEVE COMPLETELY ENCLOSING THE SIDE OF THE HUB, BLADES EACH HAVING A LONGITUDINAL AXIS AND MOUNTED ON THE ROTOR HUB SOLELY FOR OSCILLATING MOVEMENT ON ITS LONGITUDINAL AXIS FOR PITCH VARIATION, EACH BLADE HAVING A SPAR THE END OF WHICH PROJECTS INTO THE HUB, A HORN ON THE END OF EACH BLADE, A PITCH CHANGE ROD PASSING THROUGH THE HOLLOW DRIVE SHAFT AND THE BALL JOINT AND PROJECTING FROM EACH END OF THE LATTER, MEANS MOUNTING THE PITCH CHANGE ROD FOR MOVEMENT AXIALLY WITHIN THE HOLLOW DRIVE SHAFT, PITCH CHANGE MEANS CON-
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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) | 1966-03-25 | 1966-09-24 | 1967-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-25 | 1970-09-24 | 1971-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-25 | 1974-09-24 | 1975-03-26 | $7700.00 | Window Closed / Lapsed |