US3623494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air intakes for gas turbine engines
Assignee: Rolls Royce PLC
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Filing: 1970-10-02
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Granted: 1971-11-30
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Expires: 1990-10-02
Abstract
Abstract The invention concerns an air intake for a gas turbine engine including an upstream lip which is movable relative to a fixed pod member, displaceable pressure-responsive means associated with the said lip and subjected to opposing forces respectively due to the static pressure within the said intake and to ambient air pressure, the displacement of said pressure-responsive means causing movement of said lip to vary the contraction ratio of the said intake automatically and solely in response to the relative magnitudes of said pressures.
Inventors
- 👤 Michael Poucher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:10
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/04; F02C7/042; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T137/00; Y10T137/0536; Y10T137/0645
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
An air intake for a gas turbine engine including an upstream lip which is movable relative to a fixed pod member, displaceable pressure-responsive means associated with the said lip and subjected to opposing forces respectively due to the static pressure within the said intake and to ambient air pressure, the displacement of said pressure-responsive means causing movement of said lip to vary the contraction ratio of the said intake automatically and solely in response to the relative magnitudes of said pressures.
Claim 2
Dependent Claim
81 words
An air intake for a gas turbine engine including an upstream lip which is movable relative to a fixed pod member, displaceable pressure-responsive means associated with the said lip and subjected to opposing forces respectively due to the static pressure within the said intake and to ambient air pressure, the displacement of said pressure-responsive means causing movement of said lip to vary the contraction ratio of the said intake automatically and solely in response to the relative magnitudes of said pressures.
Claim 3
Dependent Claim
87 words
An intake as claimed in claim 1 wherein the lip is pivotally connected to said fixed pod member for movement between an inoperative position wherein respective adjacent surfaces of the lip and of the fixed pod member are substantially contiguous, and an operative position wherein the lip is moved in an upstream direction with a radially inward component so as simultaneously to increase the said contraction ratio and to form a gap between itself and the fixed pod member, the said gap serving as an auxiliary intake.
Claim 4
Dependent Claim
55 words
An intake as claimed in claim 2 wherein the pressure-responsive means is constituted by a generally radially extending surface of the said lip, which surface in said inoperative position is contiguous with a generally radially extending surface of said fixed pod member, there being resilient means for urging the said lip towards its inoperative position.
Claim 5
Dependent Claim
35 words
An intake as claimed in claim 3 wherein the pivotal connection between the said lip and the fixed pod member includes a roller and track arrangement, and struts connected between the rollers and the lip.
Claim 6
Dependent Claim
36 words
An intake as claimed in claim 4 wherein the resilient means is a spring anchored at one end to said fixed pod member and connected at the other end to a part movable with the rollers.
Claim 7
Dependent Claim
79 words
An intake as claimed in claim 1 wherein the lip is associated with a flexible wall and defines within itself a pair of spaces which are respectively subjected in operation to said pressures and which are separated from each other by the pressure-responsive means constituted by a movable piston connected to said flexible wall, whereby movement of said piston in response to a difference in said pressures causes flexing of said flexible wall to change the said contraction ratio.
Claim 8
Dependent Claim
54 words
An intake as claimed in claim 6 wherein the said piston is a rocking piston one end of the working face of which is in sealing engagement with a generally radial face of the upstream end of the fixed pod member, while the other end of said working face is connected to said lip.
Claim 9
Dependent Claim
33 words
An intake as claimed in claim 1 wherein the lip comprises a plurality of circumferentially adjacent segments which can move relative to one another to permit the intake to assume an asymmetric shape.
References Cited (Backward Citations)
US2948111A
Cited
US3532129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |