US3780969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wing case for air foils
Assignee: Vereinigte Flugtechnische Werke Fokker GmbH
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Filing: 1972-02-29
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Granted: 1973-12-25
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Expires: 1992-02-29
Abstract
Abstract Wing case for air foils with a closed profile shell of laminated plastic reenforced preferably by boron fibers with different orientation; flanged bars as spars sandwich the shell at corners and being bonded thereto. Aluminum ribs are in the shell, the spars are preferably made of titanium, the numbers of lamina with fiber orientations in direction of wing span and ribs correspond to the differences in elastic properties of the two metals used for ribs and spars.
Inventors
- 👤 H Nussbaum
- 👤 H Schnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:23
CPC Classifications
B; B64; B64C; B64C3/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
Wing case for air foils, comprising: a shell of closed profile in cross section made of laminated plastic, reenforced by fibers oriented in a first plurality of lamina in direction of the wing span, the fibers being oriented differently in a second plurality of lamina, the shell establishing top and bottom portions of the wing as well as webs or spar; a plurality of flanged metal bars as spar flanges arranged in pairs inside and outside of the shell and being bonded thereto; and metal ribs disposed inside of the shell, wherein different metals are used for the ribs and the bars, the fibers in the second plurality of lamina being oriented in direction of the ribs, the number of lamina of the first plurality with fibers oriented in direction of the wing span differs from the number of lamina of the second plurality with fibers oriented in direction of the ribs so that the modules of elasticity thereof in the directions of the wing span and of the ribs differ correspondingly to the differences in modules of elasticity of the two metals.
Claim 2
Dependent Claim
183 words
Wing case for air foils, comprising: a shell of closed profile in cross section made of laminated plastic, reenforced by fibers oriented in a first plurality of lamina in direction of the wing span, the fibers being oriented differently in a second plurality of lamina, the shell establishing top and bottom portions of the wing as well as webs or spar; a plurality of flanged metal bars as spar flanges arranged in pairs inside and outside of the shell and being bonded thereto; and metal ribs disposed inside of the shell, wherein different metals are used for the ribs and the bars, the fibers in the second plurality of lamina being oriented in direction of the ribs, the number of lamina of the first plurality with fibers oriented in direction of the wing span differs from the number of lamina of the second plurality with fibers oriented in direction of the ribs so that the modules of elasticity thereof in the directions of the wing span and of the ribs differ correspondingly to the differences in modules of elasticity of the two metals.
Claim 3
Dependent Claim
26 words
Wing case as in claim 1, there being a third plurality of lamina having their fibers oriented at + or - 45* to either said directions.
Claim 4
Dependent Claim
48 words
Wing case as in claim 2, wherein the shell is constructed of lamina with boron fiber reenforced plastic, the bars made of titanium, the ribs made of aluminum, the numbers of layers of said first, second and third pluralities of lamina related by 2 : 1 : 2.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |