US3892358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nozzle seal
Assignee: General Electric Co
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Filing: 1971-03-17
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Granted: 1975-07-01
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Expires: 1991-03-17
Abstract
Abstract Seal means are provided for a variable area flap nozzle of the type having an annular array of axially extending flaps hinged at their upstream ends to a duct defining structure. An annular band provides a seal at the flap hinge point and strips provide a seal between peripherally adjacent flaps. The band and strips include a preformed flex loop to enable unrestrained movement of the flaps throughout the desired area range of the nozzle.
Inventors
- 👤 Jan M Gisslen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:40
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/78; F02K1/80; F02K1/805; F02K1/06; F02K1/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
195 words
A variable area nozzle for a gas turbine engine of the type adapted to generate propulsive thrust by producing a motive fluid stream and effluxing same from a passage of said engine, said nozzle comprising: a plurality of flaps arranged in an annular array and hingeably connected to a supportive portion of said engine so as to define a downstream extension of and an outlet for said motive fluid passage; means for pivoting each said flap about its hinge connection to vary the cross-sectional area of said outlet; and seal means for preventing motive fluid leakage between peripherally adjacent ones of said flaps and at said hinge connections, said seal means comprising means forming a plurality of axial strips and an annular band having a preformed flex loop, said band secured on one side of said flex loop to said supportive engine portion and on the other side of said flex loop to said flaps, each said strip having a preformed flex loop and secured along its length to a respective pair of flaps with said flex loop disposed between said flaps, said flex loops sized to permit the desired pivotal movement of the flaps.
Claim 2
Dependent Claim
195 words
A variable area nozzle for a gas turbine engine of the type adapted to generate propulsive thrust by producing a motive fluid stream and effluxing same from a passage of said engine, said nozzle comprising: a plurality of flaps arranged in an annular array and hingeably connected to a supportive portion of said engine so as to define a downstream extension of and an outlet for said motive fluid passage; means for pivoting each said flap about its hinge connection to vary the cross-sectional area of said outlet; and seal means for preventing motive fluid leakage between peripherally adjacent ones of said flaps and at said hinge connections, said seal means comprising means forming a plurality of axial strips and an annular band having a preformed flex loop, said band secured on one side of said flex loop to said supportive engine portion and on the other side of said flex loop to said flaps, each said strip having a preformed flex loop and secured along its length to a respective pair of flaps with said flex loop disposed between said flaps, said flex loops sized to permit the desired pivotal movement of the flaps.
Claim 3
Dependent Claim
20 words
The structure of claim 1 further characterized in that said strips are integrally formed with said annular band forming means.
Claim 4
Dependent Claim
27 words
The structure of claim 1 further characterized in that said band is secured to said supportive engine portion and said flaps radially inwardly of said hinge connection.
Claim 5
Dependent Claim
25 words
The structure of claim 1 further characterized in that the flex loop of each said strip projects radially outwardly between its respective pair of flaps.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |