US3862811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Streamlined x-y-z cone valve
Assignee: United States Department of the Navy
•
Filing: 1973-08-14
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Granted: 1975-01-28
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Expires: 1993-08-14
Abstract
Abstract An air valve for a circulation control helicopter rotor. The valve comprises an outer rotating blade-carrying member having an inlet at its bottom and outlets at its periphery, and a conical inner member which directs air from the inlet to the outlets. The axis of the inner member is tiltable toward one of the outlets in order to provide cyclic lift control; its exterior surface is smoothly contoured to reduce flow losses within the hub airflow path. A second embodiment allows pneumatic control of lift control airflow. A third embodiment utilizes a non-circular cone to impose harmonics on the lift control airflow.
Inventors
- 👤 Henry J Bernaerts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:21
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
A hub for a circulation control rotor comprising: an outer member having a plurality of hollow fluid-receiving blades mounted thereon and fluid inlet means perpendicular to said hollow blades; means for directing fluid from said inlet to said plurality of hollow blades; and fluidic means for biasing fluid flow to a selected one of said plurality of blades.
Claim 2
Dependent Claim
58 words
A hub for a circulation control rotor comprising: an outer member having a plurality of hollow fluid-receiving blades mounted thereon and fluid inlet means perpendicular to said hollow blades; means for directing fluid from said inlet to said plurality of hollow blades; and fluidic means for biasing fluid flow to a selected one of said plurality of blades.
Claim 3
Dependent Claim
31 words
A hub as in claim 1 wherein said means for directing fluid from said inlet to said plurality of hollow blades comprises a flared cone with its aPex in said inlet.
Claim 4
Dependent Claim
16 words
A hub as in claim 2 including means to rotate said flared cone about its axis.
Claim 5
Dependent Claim
26 words
A hub as in claim 3 wherein said fluidic means for biasing fluid flow comprises sets of axially aligned fluid dispensing holes on said flared cone.
Claim 6
Dependent Claim
24 words
A hub as in claim 4 wherein said sets of axially aligned fluid dispensing holes are spaced about the circumference of said flared cone.
References Cited (Backward Citations)
US1982968A
Cited
US2686567A
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US3211397A
Cited
US3039537A
Cited
US3209714A
Cited
US3326296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |