US4242044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensating structure for circulation control rotor pneumatic valve
Assignee: United States Department of the Navy
•
Filing: 1979-07-11
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Granted: 1980-12-30
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Expires: 1999-07-11
Abstract
Abstract Structure for minimizing gap changes in a circulation control pneumatic ve. A flat, flexible ring is located below and adjacent to the plane of the nozzle of blade ducts. The flat, flexible ring is supported from beneath by an array of actuators. In one embodiment, the nozzles are immobilized relative to hub-induced displacements and thus eliminate any feedback due to hub flexing. In another embodiment, the nozzle is pivotally attached to a rotating carrier and feedback is reversed so that feedback becomes negative.
Inventors
- 👤 George A. McCoubrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:34
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
117 words
In a system for ventilated helicopter rotor blades, a rotor assembly for controlling the air flow into the blades comprising, a stationarily mounted rotor mast, a rotor hub rotatably mounted on said rotor mast, said rotor mast and hub forming a plenum for maintaining air fed thereinto, a plurality of rotor blades attached to said rotor hub, a plurality of air ducts carried one each by each said rotor blade, each duct having a downwardly extending nozzle section extending into said plenum, means for regulating flow of air into each downwardly extending nozzle section, and means for restricting movement of said downwardly extending nozzle section when said air duct is deflected by deflection of said rotor blades.
Claim 2
Dependent Claim
117 words
In a system for ventilated helicopter rotor blades, a rotor assembly for controlling the air flow into the blades comprising, a stationarily mounted rotor mast, a rotor hub rotatably mounted on said rotor mast, said rotor mast and hub forming a plenum for maintaining air fed thereinto, a plurality of rotor blades attached to said rotor hub, a plurality of air ducts carried one each by each said rotor blade, each duct having a downwardly extending nozzle section extending into said plenum, means for regulating flow of air into each downwardly extending nozzle section, and means for restricting movement of said downwardly extending nozzle section when said air duct is deflected by deflection of said rotor blades.
Claim 3
Dependent Claim
39 words
The system of claim 1 wherein said means for restricting movement of said downwardly extending nozzle section comprises a nozzle carrier rotatably mounted to said rotor mast and means for attaching each said nozzle section to said nozzle carrier.
Claim 4
Dependent Claim
17 words
The system of claim 2 wherein each said nozzle section is pivotally attached to said nozzle carrier.
Claim 5
Dependent Claim
17 words
The system of claim 2 wherein each said nozzle section is rigidly attached to said nozzle carrier.
Claim 6
Dependent Claim
136 words
In a system for ventilated helicopter rotor blades, a rotor assembly for controlling the air flow into the blades comprising, a stationarily mounted rotor mast, a rotor hub rotatably mounted on said rotor mast, said rotor mast and hub forming a plenum for maintaining air fed thereinto, a plurality of rotor blades attached to said rotor hub, a plurality of air ducts carried one each by each said rotor blade, each duct having a downwardly extending nozzle section extending into said plenum, an annular flex plate positioned below said downwardly extending nozzle sections, means for moving said flex plate relative to said downwardly extending nozzle sections for regulating flow of air into said air ducts, a nozzle carrier rotatably mounted to said rotor mast, and means for attaching each said nozzle section to said nozzle carrier.
Claim 7
Dependent Claim
136 words
In a system for ventilated helicopter rotor blades, a rotor assembly for controlling the air flow into the blades comprising, a stationarily mounted rotor mast, a rotor hub rotatably mounted on said rotor mast, said rotor mast and hub forming a plenum for maintaining air fed thereinto, a plurality of rotor blades attached to said rotor hub, a plurality of air ducts carried one each by each said rotor blade, each duct having a downwardly extending nozzle section extending into said plenum, an annular flex plate positioned below said downwardly extending nozzle sections, means for moving said flex plate relative to said downwardly extending nozzle sections for regulating flow of air into said air ducts, a nozzle carrier rotatably mounted to said rotor mast, and means for attaching each said nozzle section to said nozzle carrier.
Claim 8
Dependent Claim
17 words
The system of claim 5 wherein each said nozzle section is pivotally attached to said nozzle carrier.
Claim 9
Dependent Claim
17 words
The system of claim 5 wherein each said nozzle section is rigidly attached to said nozzle carrier.
Claim 10
Dependent Claim
176 words
In a system for ventilated helicopter rotor blades, a rotor assembly for controlling the air flow into the blades comprising, a stationarily mounted rotor mast, a rotor hub rotatably mounted on said rotor mast, said rotor mast and hub forming a plenum for maintaining air fed thereinto, a plurality of rotor blades attached to said rotor hub, a plurality of air ducts carried one each by each said rotor blade, each duct having a downwardly extending nozzle section extending into said plenum, an annular flex plate positioned below said downwardly extending nozzle sections, a stationarily mounted standpipe, a pivotal support slidably mounted on said standpipe for supporting said annular flex plate, linkage means for moving said pivotal support to position said flex plate relative to said downwardly extending nozzle sections for regulating flow of air into said air ducts, spring means encompassing said standpipe and engaging said pivotal support for eliminating free-play from said linkage means, a nozzle carrier rotatably mounted on said standpipe, and means for attaching each said nozzle section to said nozzle carrier.
Claim 11
Dependent Claim
176 words
In a system for ventilated helicopter rotor blades, a rotor assembly for controlling the air flow into the blades comprising, a stationarily mounted rotor mast, a rotor hub rotatably mounted on said rotor mast, said rotor mast and hub forming a plenum for maintaining air fed thereinto, a plurality of rotor blades attached to said rotor hub, a plurality of air ducts carried one each by each said rotor blade, each duct having a downwardly extending nozzle section extending into said plenum, an annular flex plate positioned below said downwardly extending nozzle sections, a stationarily mounted standpipe, a pivotal support slidably mounted on said standpipe for supporting said annular flex plate, linkage means for moving said pivotal support to position said flex plate relative to said downwardly extending nozzle sections for regulating flow of air into said air ducts, spring means encompassing said standpipe and engaging said pivotal support for eliminating free-play from said linkage means, a nozzle carrier rotatably mounted on said standpipe, and means for attaching each said nozzle section to said nozzle carrier.
Claim 12
Dependent Claim
17 words
The system of claim 8 wherein each said nozzle section is pivotally attached to said nozzle carrier.
Claim 13
Dependent Claim
17 words
The system of claim 8 wherein each said nozzle section is rigidly attached to said nozzle carrier.
References Cited (Backward Citations)
US2454040A
Cited
US3073394A
Cited
DE1269890B
Cited
FR1446212A
Cited
US3412680A
Cited
US3830588A
Cited
US3904313A
Cited
US3917435A
Cited
US3918833A
Cited
US3990811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |