US3620640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller or fan shrouds
Assignee: Airbus Group SAS
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Filing: 1970-03-26
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Granted: 1971-11-16
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Expires: 1990-03-26
Abstract
Abstract An improved propeller shroud comprising a toroidal cavity formed on its inside surface along its entire periphery level with the blades of said propeller and along the meridian of the shroud and movable flaps mounted on downstream of same cooperating with a cavity bottom comprising a retractable wall with or without streamlined partition walls adapted within said toroidal cavity and along substantially meridian planes of said shroud.
Inventors
- 👤 Jean Soulez-Lariviere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:40
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; B; B64; B64C; B64C11/00; B64C11/001; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
An improved blade propeller or fan shroud comprising a toroidal cavity along its entire periphery level with the blades of said propeller or said fan and along the meridian of the shroud wherein said toroidal cavity has a width of the same order of magnitude as the thickness of the shroud, comprises a bottom so that the upstream portion of said shroud is made redundant and, along substantially meridian planes of said shroud, streamlined partition walls, whereby rotation of the air is assisted in a substantially meridian direction counter to the normal direction of rotation of the air driven by the blades, and movable flaps mounted on the downstream end of said shroud.
Claim 2
Dependent Claim
113 words
An improved blade propeller or fan shroud comprising a toroidal cavity along its entire periphery level with the blades of said propeller or said fan and along the meridian of the shroud wherein said toroidal cavity has a width of the same order of magnitude as the thickness of the shroud, comprises a bottom so that the upstream portion of said shroud is made redundant and, along substantially meridian planes of said shroud, streamlined partition walls, whereby rotation of the air is assisted in a substantially meridian direction counter to the normal direction of rotation of the air driven by the blades, and movable flaps mounted on the downstream end of said shroud.
Claim 3
Dependent Claim
89 words
An improved propeller or fan shroud, comprising on its inner surface and along its entire periphery a toroidal cavity having a width of the same order of magnitude as the thickness of the shroud, a cavity bottom comprising a retractable wall, movable flaps mounted on the downstream end of said shroud, and means operatively connected between said flaps and said bottom whereby to cause motion of the latter to impart motion to said flaps between two limit positions, to wit a divergent exhaust position and a convergent exhaust position.
Claim 4
Dependent Claim
89 words
An improved propeller or fan shroud, comprising on its inner surface and along its entire periphery a toroidal cavity having a width of the same order of magnitude as the thickness of the shroud, a cavity bottom comprising a retractable wall, movable flaps mounted on the downstream end of said shroud, and means operatively connected between said flaps and said bottom whereby to cause motion of the latter to impart motion to said flaps between two limit positions, to wit a divergent exhaust position and a convergent exhaust position.
Claim 5
Dependent Claim
30 words
A shroud according to claim 2, wherein said retractable wall is united therewith by its upstream edge, its downstream edge comprising said means for imparting motion to said movable flaps.
Claim 6
Dependent Claim
20 words
A shroud according to claim 2, wherein said motion-imparting means include a linkage system operatively connected to said movable flaps.
Claim 7
Dependent Claim
15 words
A shroud according to claim 4, wherein said movable flaps pivot about their upstream edge.
Claim 8
Dependent Claim
45 words
A shroud according to claim 4, comprising a well on its downstream side, wherein said movable flaps pivot about their downstream edge in order to retract, in their limit convergent exhaust position, into said well and form a single thin aerofoil section with said shroud.
Claim 9
Dependent Claim
18 words
A shroud according to claim 2, comprising a slideway-forming groove, one edge of said retractable wall sliding therein.
Claim 10
Dependent Claim
21 words
A shroud according to claim 3, further comprising streamlined partitions within said toroidal cavity along substantially meridian planes of said shroud.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |