US3349853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter lift control mechanism
Assignee: Power Jets Research and Development Ltd
•
Filing: 1965-05-24
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Granted: 1967-10-31
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Expires: 1985-05-24
Abstract
No abstract record available.
Inventors
- 👤 Flint John Avery
- 👤 George James Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:19
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/20; B64C27/32; B64C27/325; B64C27/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A CONTROL MECHANISM FOR A HELICOPTER ROTOR HAVING BLADES ON WHICH AERODYNAMIC LIFT IS INDUCED BY THE DISCHARGE OF FLUID STREAMS AS THIN LAYERS OVER THE BLADE SURFACES, SAID MECHANISM COMPRISING MEANS FOR LEADING FLUID TO THE ROTOR; FIRST CONTROL MEANS OPERABLE TO REGULATE THE FLOW OF SAID FLUID, SAID FIRST CONTROL MEANS COMPRISING A VALVE ASSEMBLY HAVING A PLURALITY OF CHANNELS FOR FLUID FLOW AND A VALVE DISPOSED IN EACH OF SAID CHANNELS, THE VALVES BEING CAPABLE OF ADJUSTMENT DIFFERENTIALLY OF EACH OTHER, A SWASH PLATE OPERATIVELY CONNECTED TO THE VALVES BY MEANS OF PUSH RODS, AND A CONTROL CONNECTED TO TILT THE SWASH PLATE; A SECOND CONTROL MEANS OPERABLE TO REGULATE THE FLOW OF SAID FLUID AND COMPRISING MEANS FOR VARYING THE EFFECTIVE LENGTHS OF THE PUSH RODS.
Claim 2
Dependent Claim
130 words
A CONTROL MECHANISM FOR A HELICOPTER ROTOR HAVING BLADES ON WHICH AERODYNAMIC LIFT IS INDUCED BY THE DISCHARGE OF FLUID STREAMS AS THIN LAYERS OVER THE BLADE SURFACES, SAID MECHANISM COMPRISING MEANS FOR LEADING FLUID TO THE ROTOR; FIRST CONTROL MEANS OPERABLE TO REGULATE THE FLOW OF SAID FLUID, SAID FIRST CONTROL MEANS COMPRISING A VALVE ASSEMBLY HAVING A PLURALITY OF CHANNELS FOR FLUID FLOW AND A VALVE DISPOSED IN EACH OF SAID CHANNELS, THE VALVES BEING CAPABLE OF ADJUSTMENT DIFFERENTIALLY OF EACH OTHER, A SWASH PLATE OPERATIVELY CONNECTED TO THE VALVES BY MEANS OF PUSH RODS, AND A CONTROL CONNECTED TO TILT THE SWASH PLATE; A SECOND CONTROL MEANS OPERABLE TO REGULATE THE FLOW OF SAID FLUID AND COMPRISING MEANS FOR VARYING THE EFFECTIVE LENGTHS OF THE PUSH RODS.
References Cited (Backward Citations)
US3109494A
Cited
US3139936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |