Patent US3677504A successfully refreshed from Google Patents.
US3677504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control flap arrangement
Assignee: Vereinigte Flugtechnische Werke Fokker GmbH
•
Filing: 1970-08-25
•
Granted: 1972-07-18
•
Expires: 1990-08-25
Abstract
Abstract A control flap arrangement for an airfoil of an aircraft has a control flap with a nose surface defined by a center of curvature. The control flap is mounted to the airfoil for pivoting movement with respect thereto, and is actuated by a fluid piston-cylinder device which is connected to the airfoil and to the control flap at a point offset from the pivot point thereof. Cover members are mounted in the slot formed between the control flap and the airfoil in such a manner that when the control flap is pivoted with respect to the airfoil the respective one of the cover members arranged in the slot on the side to which the control flap is pivoting will move away from the airfoil to divert air through the slot and the control flap will move away from the other device to form the slot.
Inventors
- 👤 Hans-Jurgen Schwarzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:37
CPC Classifications
B; B64; B64C; B64C23/00; B64C23/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
182 words
A control flap arrangement for an airfoil of an aircraft, comprising, in combination: a. a control flap having a nose surface defined by a center of curvature and oriented toward the airfoil; b. means mounting said control flap to the airfoil for pivoting movement with respect to the airfoil about a pivot point between the center of curvature of the nose surface and the profile of the airfoil; c. first and second slot defining means arranged on respective sides of said control flap and the airfoil and between said control flap and the airfoil; and d. means mounting said first and second slot defining means on said control flap and the airfoil for movement away from the airfoil to define an inlet of a slot only when said control flap is pivoted toward the respective slot defining means, and for permitting said control flap to pivot away from the other of said slot defining means to define an outlet of a slot; e. said slot defining means which moves away from the airfoil always being on the pressure side of the airfoil.
Claim 2
Dependent Claim
182 words
A control flap arrangement for an airfoil of an aircraft, comprising, in combination: a. a control flap having a nose surface defined by a center of curvature and oriented toward the airfoil; b. means mounting said control flap to the airfoil for pivoting movement with respect to the airfoil about a pivot point between the center of curvature of the nose surface and the profile of the airfoil; c. first and second slot defining means arranged on respective sides of said control flap and the airfoil and between said control flap and the airfoil; and d. means mounting said first and second slot defining means on said control flap and the airfoil for movement away from the airfoil to define an inlet of a slot only when said control flap is pivoted toward the respective slot defining means, and for permitting said control flap to pivot away from the other of said slot defining means to define an outlet of a slot; e. said slot defining means which moves away from the airfoil always being on the pressure side of the airfoil.
Claim 3
Dependent Claim
110 words
The control flap arrangement defined in claim 1, wherein said mounting means has a separate four-bar linkage means associated with each of said slot defining means for connecting the respective slot defining means to the airfoil, and a separate drive arm means associated with each of said slot defining means and connected to its respective slot defining means, and wherein said control flap defines a pair of groves in each of which a respective one of said drive arm means engages to form a sliding block linkage means for causing a movement of its respective slot defining means when said control flap is pivoted toward the respective slot defining means.
Claim 4
Dependent Claim
46 words
The control flap arrangement defined in claim 2, wherein each of said first and second slot defining means is a cover member and defines at least one guide surface for forming the slot in conjunction with the nose portion of said control flap and the airfoil.
Claim 5
Dependent Claim
59 words
The control flap arrangement defined in claim 3, further including fluid piston-cylinder means for actuating said control flap, said actuating means connected to said airfoil and to said flap at a point off-set from the pivot point of said control flap and arranged so that said control flap may be pivoted in either direction with respect to the airfoil.
References Cited (Backward Citations)
US2282516A
Cited
US2276522A
Cited
US2587359A
Cited
US3026067A
Cited
US3092354A
Cited
US3259341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |