Patent US3570769A successfully refreshed from Google Patents.
US3570769A
Expired / Lapsed
US
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Jet nozzle
Assignee: Rolls Royce PLC
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Filing: 1968-12-11
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Granted: 1971-03-16
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Expires: 1988-12-11
Abstract
Abstract A jet nozzle comprises a cylindrical member whose downstream end is provided with a plurality of angularly spaced-apart, alternately arranged first and second flaps each of whose adjacent paris of longitudinal edges are interconnected by a plurality of lobe wall members, the flaps and lobe wall members being adapted collectively to provide the nozzle with a plurality of angularly spaced-apart lobes, each lobe wall member being pivotally connected along each of its longitudinal edges to the adjacent longitudinal edge of the adjacent flap or lobe wall member, and means for effecting relative radial movement of the first and second flaps so as to alter the radial depth of the downstream end of each of said lobes.
Inventors
- 👤 Frederick Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:08
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/06; F02K1/12; F02K1/123; F02K1/09; F02K1/1207; F02K1/1261; F02K1/46; F02K1/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
A jet nozzle comprising a cylindrical member, a plurality of angularly spaced-apart, alternately arranged first and second flaps which are mounted at the downstream end of the cylindrical member and each of whose adjacent pairs of longitudinal edges are interconnected by a plurality of pivotally interconnected lobe wall members, the flaps and lobe wall members being adapted collectively to provide the nozzle with a plurality of angularly spaced-apart lobes which may be radially expanded and contracted like a bellows, each lobe wall member being pivotally connected along each of its longitudinal edges to the adjacent longitudinal edge of the adjacent flap or lobe wall member, and means for effecting relative radial movement of the first and second flaps so as to alter the radial depth of the downstream end of each of said lobes.
Claim 2
Dependent Claim
134 words
A jet nozzle comprising a cylindrical member, a plurality of angularly spaced-apart, alternately arranged first and second flaps which are mounted at the downstream end of the cylindrical member and each of whose adjacent pairs of longitudinal edges are interconnected by a plurality of pivotally interconnected lobe wall members, the flaps and lobe wall members being adapted collectively to provide the nozzle with a plurality of angularly spaced-apart lobes which may be radially expanded and contracted like a bellows, each lobe wall member being pivotally connected along each of its longitudinal edges to the adjacent longitudinal edge of the adjacent flap or lobe wall member, and means for effecting relative radial movement of the first and second flaps so as to alter the radial depth of the downstream end of each of said lobes.
Claim 3
Dependent Claim
39 words
A nozzle as claimed in claim 1 in which each of the first and second flaps is pivotally connected at its upstream end to the cylindrical member and is adapted to be urged radially outwardly by the gas forces.
Claim 4
Dependent Claim
50 words
A nozzle as claimed in claim 2 in which, when the said lobes have their maximum radial depth, the downstream ends of the first and second flaps are respectively disposed radially outwardly and inwardly of the downstream end of the cylindrical member so as to increase the nozzle outlet area.
Claim 5
Dependent Claim
64 words
A nozzle as claimed in claim 1 in which the downstream ends of the second flaps are disposed radially inwardly of those of the first flaps, means being provided for moving the cylindrical member longitudinally into and out of positions in which there is abutment between the second flaps and fixed abutment means, the said abutment causing radial inward movement of the second flaps.
Claim 6
Dependent Claim
27 words
A nozzle as claimed in claim 4 in which the fixed abutment means comprise internal cam surfaces on a pod within which the cylindrical member is mounted.
Claim 7
Dependent Claim
43 words
A nozzle as claimed in claim 4 in which the cylindrical member is mounted concentrically about and is movable longitudinally over a fixed jet pipe into and out of a position in which the said flaps are disposed downstream of the jet pipe.
Claim 8
Dependent Claim
81 words
A nozzle as claimed in claim 6 in which a sleeve is disposed between the jet pipe and the cylindrical member, and there is a bulbous center body mounted with the jet pipe and extending beyond the downstream end thereof, the sleeve being movable between a first position in which it does not extend beyond the downstream end of the jet pipe, and a second position in which it does so extend and forms a convergent nozzle with the center body.
Claim 9
Dependent Claim
31 words
A nozzle as claimed in claim 7 in which the sleeve is movable into and out of a third position in which it forms a convergent-divergent nozzle with the center body.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |