US3917435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cam and nozzle control valve for fluid flow modulation
Assignee: Individual
•
Filing: 1974-01-11
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Granted: 1975-11-04
•
Expires: 1994-01-11
Abstract
Abstract A hub valve for a CCR helicopter comprising a nonrotating central cam and a movable nozzle at the inlet to each blade. The cam determines the azimuthal position and relative magnitude of the cyclic lift and the nozzles, which move radially inward and outward, determine the magnitude of the collective lift. In a second embodiment, the nozzles are cycled radially in sequence to provide cyclic lift control at a fundamental frequency as well as at harmonics of this frequency.
Inventors
- 👤 Joseph B Wilkerson
- 👤 Kenneth R Reader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:04
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
52 words
A rotor hub for a circulation control helicopter rotor comprising: a non-rotating member; means to horizontally translate said non-rotating member; a rotating blade-carrying member surrounding said non-rotating member and spaced therefrom to form a fluid flow passage therebetween; and movable fluid flow nozzles in said rotating blade-carrying member adjacent the nonrotating member.
Claim 2
Dependent Claim
52 words
A rotor hub for a circulation control helicopter rotor comprising: a non-rotating member; means to horizontally translate said non-rotating member; a rotating blade-carrying member surrounding said non-rotating member and spaced therefrom to form a fluid flow passage therebetween; and movable fluid flow nozzles in said rotating blade-carrying member adjacent the nonrotating member.
Claim 3
Dependent Claim
22 words
A rotor hub as in claim 1 including means to move said fluid flow nozzles toward and away from said non-rotating member.
Claim 4
Dependent Claim
14 words
A rotor hub as in claim 2 having one fluid flow nozzle per blade.
Claim 5
Dependent Claim
24 words
A rotor hub as in claim 3 including a cam on said non-rotating member and a follower assembly for moving said fluid flow nozzles.
Claim 6
Dependent Claim
25 words
A rotor hub as in claim 4 wherein said cam includes a plurality of surfaces which cause both linear and non-linear motion of said nozzles.
Claim 7
Dependent Claim
22 words
A rotor hub as in claim 5 wherein said cam includes surfaces whose similarly contoured portions are equally spaced around said cam.
Claim 8
Dependent Claim
23 words
A rotor hub as in claim 5 wherein said cam includes a surface which has a plurality of contours superimposed on one another.
Claim 9
Dependent Claim
15 words
A rotor hub as in claim 7 wherein said contours are of different cyclic periods.
Claim 10
Dependent Claim
14 words
A rotor hub as in claim 7 wherein said contours are of different amplitudes.
Claim 11
Dependent Claim
16 words
A rotor hub as in claim 6 including means to move said cam along its axis.
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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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |