Patent US3816019A successfully refreshed from Google Patents.
US3816019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cam type air control valves
Assignee: United States Department of the Navy
•
Filing: 1972-08-24
•
Granted: 1974-06-11
•
Expires: 1992-08-24
Abstract
Abstract A valve for controlling air flow having a hub adapted to form a plenum therein for maintaining air fed thereinto. At least one nozzle is mounted within the hub for providing a flow path to conduct air from the plenum. Means are mounted within the hub to establish with the nozzles a condition of relative revolving motion and for establishing a quantity of steady air flow through each nozzle and at least one cyclic flow pattern of air through each nozzle. The means within the hub being axially and azimuthally positionable with respect to the nozzles while the condition of relative revolving motion exists.
Inventors
- 👤 G Norman
- 👤 K Reader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:59
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
In a system for ventilated helicopter rotor blades, a rotor assembly for controlling the air flow into the blades, comprising: a revolvable hub adapted to form a plenum therein for maintaining air fed thereinto and further adapted for connecting a pluality of blades thereto; at least one nozzle Connected to the hub and corresponding to each blade connection for providing a flow path to conduct air from the plenum to each blade; and means within the plenum for establishing a quantity of steady air flow through each nozzle and at least one cyclic flow pattern of air through each nozzle per each revolution of the hub, said means comprising a first cam and a second cam mounted on independent concentric shafts plus means to selectively position said cams independently of each other or together as a unit.
Claim 2
Dependent Claim
137 words
In a system for ventilated helicopter rotor blades, a rotor assembly for controlling the air flow into the blades, comprising: a revolvable hub adapted to form a plenum therein for maintaining air fed thereinto and further adapted for connecting a pluality of blades thereto; at least one nozzle Connected to the hub and corresponding to each blade connection for providing a flow path to conduct air from the plenum to each blade; and means within the plenum for establishing a quantity of steady air flow through each nozzle and at least one cyclic flow pattern of air through each nozzle per each revolution of the hub, said means comprising a first cam and a second cam mounted on independent concentric shafts plus means to selectively position said cams independently of each other or together as a unit.
Claim 3
Dependent Claim
51 words
The system of claim 1 wherein said cams are connected to concentric camshafts which are axially positionable in unison along the axes thereof for axially varying the position of the cams relative to a fixed reference and for varying the established quantity of steady and cyclic air flow through the nozzles.
Claim 4
Dependent Claim
47 words
The system of claim 2 including means to independently axially position said cams along the axes of the concentric camshafts for axially varying the position of the cams relative to each other and for varying the established quantity of steady and cyclic air flow through the nozzles.
Claim 5
Dependent Claim
45 words
The system of claim 3 including means to azimuthally position said cams in unison about the axes of the concentric camshaft for azimuthally varying the position of the cams relative to a fixed reference and for varying the phasing of the established cyclic flow pattern.
Claim 6
Dependent Claim
43 words
The system of claim 4 including means to independently azimuthally position said cams about the axes of the concentric camshafts for azimuthally varying the position of the cams relative to each other and for varying the phasing of the established cyclic flow pattern.
References Cited (Backward Citations)
US3547317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |