Patent US3918833A successfully refreshed from Google Patents.
US3918833A
Expired / Lapsed
US
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Circulation control rotor hub using teacup cam and pushrod valves
Assignee: Individual
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Filing: 1974-01-11
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Granted: 1975-11-11
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Expires: 1994-01-11
Abstract
Abstract A circulation control rotor (CCR) hub having pushrod valves at the inlet to each blade air channel; the valves are operated by either of two cams that have profiles which approximate teacups. One cam is circular in horizontal cross section and provides cyclic lift control air once per revolution; the other cam is oval in horizontal cross section and provides cyclic lift control air twice per revolution. The cams are translatable horizontally and vertically to allow the cam followers to ride on the desired profile.
Inventors
- 👤 Warren H Eilertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:04
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
A circulation control rotor comprising: a hub; a plurality of hollow blades attached to said hub; cam operated poppet valves at the entrances to said hollow blades; a plurality of cams on a shaft within said hub which operate said valves; and
Claim 2
Dependent Claim
42 words
A circulation control rotor comprising: a hub; a plurality of hollow blades attached to said hub; cam operated poppet valves at the entrances to said hollow blades; a plurality of cams on a shaft within said hub which operate said valves; and
Claim 3
Dependent Claim
21 words
A circulation control rotor as in claim 1 including means to translate said cam in a plane perpendicular to said shaft.
Claim 4
Dependent Claim
59 words
A circulation control rotor comprising: a rotatable hub; a plurality of hollow blades attached to said hub; cam operated valves at the entrances to said hollow blades; a plurality of cams on a common shaft to operate said valves in a plurality of distinct cyclic variations; and means to rotate and translate said shaft about and along its axis.
Claim 5
Dependent Claim
59 words
A circulation control rotor comprising: a rotatable hub; a plurality of hollow blades attached to said hub; cam operated valves at the entrances to said hollow blades; a plurality of cams on a common shaft to operate said valves in a plurality of distinct cyclic variations; and means to rotate and translate said shaft about and along its axis.
Claim 6
Dependent Claim
21 words
A circulation control rotor as in claim 3 including means to translate said cams in a plane perpendicular to said shaft.
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |