US4596512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circulation controlled rotor blade tip vent valve
Assignee: RTX Corp
•
Filing: 1984-08-23
•
Granted: 1986-06-24
•
Expires: 2004-08-23
Abstract
Abstract Inadvertent slot opening in a circulation controlled rotor due to plenum valve leakage is averted by venting duct pressure below a control minimum. A vent valve is disclosed.
Inventors
- 👤 Timothy A. Krauss
- 👤 Donald R. Carter, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:08
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
A circulation controlled rotor system, comprising: a pressurized air plenum; plenum valves for modulating the release of air from the plenum; a blade having an edge slot for circulation control; a duct disposed in the blade for communicating air from the plenum valves to the edge slot; and valve means disposed in the duct for venting pressure from the duct in response to air pressure in the duct below a minimum control pressure.
Claim 2
Dependent Claim
73 words
A circulation controlled rotor system, comprising: a pressurized air plenum; plenum valves for modulating the release of air from the plenum; a blade having an edge slot for circulation control; a duct disposed in the blade for communicating air from the plenum valves to the edge slot; and valve means disposed in the duct for venting pressure from the duct in response to air pressure in the duct below a minimum control pressure.
Claim 3
Dependent Claim
66 words
A circulation controlled rotor system according to claim 1: wherein the edge slot is preloaded closed at a slot preload pressure which is less than the minimum control pressure; and wherein the valve means vents pressure from the duct in response to air pressure in the duct in a range of pressures extending from at least the slot preload pressure to below the minimum control pressure.
References Cited (Backward Citations)
US2885160A
Cited
US3062483A
Cited
US3005496A
Cited
GB1158312A
Cited
US3588273A
Cited
US3689173A
Cited
US3887146A
Cited
US3964838A
Cited
US4117995A
Cited
US4507050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |