US4493612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axially slideable plenum for circulation control aircraft
Assignee: RTX Corp
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Filing: 1982-09-30
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Granted: 1985-01-15
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Expires: 2002-09-30
Abstract
Abstract Mechanical collective pitch control system for a circulation control rotor system aircraft utilizing an axially moveable pneumatic system plenum 32 in the collective pitch control system.
Inventors
- 👤 Frank P. D'Anna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:28
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325; B64C27/54; B64C27/72; Y; Y02; Y02T; Y02T50/00; Y02T50/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
159 words
An aircraft utilizing a circulation control rotor system having a rotor drive shaft with rotor blades connected thereto and stationary means surrounding and supporting said drive shaft, a pneumatic system for supplying compressed air to said rotor blades including air storage means surrounding said rotor drive shaft, said air storage means including a nonrotating chamber surrounding said stationary means and having means permitting axial sliding with respect thereto and a rotatable chamber surrounding said nonrotating chamber and having means permitting rotary movement with respect thereto, said air storage means including means for admitting compressed air to said nonrotating chamber and means for conducting air from said rotatable chamber to said rotor blades, mechanical collective pitch control means connected to said air storage means to impact axial sliding thereto as the result of blade pitch change inputs and means connecting said air storage means to said rotor blades to change blade collective pitch in response to blade pitch change inputs.
Claim 2
Dependent Claim
159 words
An aircraft utilizing a circulation control rotor system having a rotor drive shaft with rotor blades connected thereto and stationary means surrounding and supporting said drive shaft, a pneumatic system for supplying compressed air to said rotor blades including air storage means surrounding said rotor drive shaft, said air storage means including a nonrotating chamber surrounding said stationary means and having means permitting axial sliding with respect thereto and a rotatable chamber surrounding said nonrotating chamber and having means permitting rotary movement with respect thereto, said air storage means including means for admitting compressed air to said nonrotating chamber and means for conducting air from said rotatable chamber to said rotor blades, mechanical collective pitch control means connected to said air storage means to impact axial sliding thereto as the result of blade pitch change inputs and means connecting said air storage means to said rotor blades to change blade collective pitch in response to blade pitch change inputs.
Claim 3
Dependent Claim
22 words
An aircraft in accordance with claim 1 characterized by air storage means located immediately below the rotational plane of the rotor blades.
Claim 4
Dependent Claim
26 words
An aircraft in accordance with claim 1 characterized by means connecting said rotatable chamber to said rotor drive shaft so that said chamber is rotated thereby.
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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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |