Patent US4583704A successfully refreshed from Google Patents.
US4583704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic system structure for circulation control aircraft
Assignee: RTX Corp
•
Filing: 1983-12-27
•
Granted: 1986-04-22
•
Expires: 2003-12-27
Abstract
Abstract A plenum for a circulation control rotor aircraft which surrounds the rotor drive shaft (18) and is so constructed that the top (32), outer (38) and bottom (36) walls through compressed air is admitted are fixed to aircraft structure and the inner wall (34) through which air passes to rotor blades (14) rotates with the drive shaft and rotor blades.
Inventors
- 👤 Timothy A. Krauss
- 👤 Stephan Roman
- 👤 Robert J. Beurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:21
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
In a pneumatic system for an aircraft using a circulation control rotor, said aircraft having a helicopter rotor assembly including drive means connected to rotor blades, said pneumatic system including a compressed air storage chamber surrounding said drive means and having a top wall, a bottom wall, an inner circumferential wall and an outer circumferential wall, and ducting for conducting air from said storage chamber to said rotor blades, characterized in that said top wall, bottom wall and outer circumferential wall are mounted in a stationary manner relative to said helicopter airframe, said inner circumferential wall being freely rotatable with respect to said top, bottom and outer circumferential walls, said ducting being connected to said inner circumferential wall radially inward from said wall and between said wall and said drive means and also being connected to said blades, said inner circumferential wall including a first level of passageways through which air is admitted to said ducting and the leading edge of said rotor blades and a second level of passageways through which air is admitted to said ducting and the trailing edge of said rotor blades.
Claim 2
Dependent Claim
186 words
In a pneumatic system for an aircraft using a circulation control rotor, said aircraft having a helicopter rotor assembly including drive means connected to rotor blades, said pneumatic system including a compressed air storage chamber surrounding said drive means and having a top wall, a bottom wall, an inner circumferential wall and an outer circumferential wall, and ducting for conducting air from said storage chamber to said rotor blades, characterized in that said top wall, bottom wall and outer circumferential wall are mounted in a stationary manner relative to said helicopter airframe, said inner circumferential wall being freely rotatable with respect to said top, bottom and outer circumferential walls, said ducting being connected to said inner circumferential wall radially inward from said wall and between said wall and said drive means and also being connected to said blades, said inner circumferential wall including a first level of passageways through which air is admitted to said ducting and the leading edge of said rotor blades and a second level of passageways through which air is admitted to said ducting and the trailing edge of said rotor blades.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |