US3785594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft flap system
Assignee: BAC AND BRITISH AEROSPACE
•
Filing: 1972-03-10
•
Granted: 1974-01-15
•
Expires: 1992-03-10
Abstract
Abstract In an aircraft, a lift-increasing flap system includes a flap carried on units which each comprise two guide members which are telescopic with one another, there being provided means such that on initial extension of the flap, the guides are coupled together and extend as one, but on further extension the guides are uncoupled such that one guide can extend from the other.
Inventors
- 👤 N Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:52
CPC Classifications
B; B64; B64C; B64C9/00; B64C9/14; B64C9/16; B64C9/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
A lift-increasing flap system for aircraft which is arranged to be movable from a fully retracted position to a position of intermediate extension and subsequently to a fully extended position including in combination with an aircraft wing, a flap, an actuator device for extending and retracting the flap from and toward the wing, a first guide unit and means mounting the first guide unit for extension and retraction movement with respect to the wing, a second guide unit, and means mounting the first guide unit for extension and retraction movement on the first guide unit, the second guide unit carrying the flap, the guide units having releasable coupling means whereby on initial extension of the actuator the two guide units are coupled together and move as one until the said position of intermediate extension is reached, but, on further extension of the actuator, they are uncoupled so that the second guide unit can be extended from the first guide unit to reach the said fully extended position.
Claim 2
Dependent Claim
167 words
A lift-increasing flap system for aircraft which is arranged to be movable from a fully retracted position to a position of intermediate extension and subsequently to a fully extended position including in combination with an aircraft wing, a flap, an actuator device for extending and retracting the flap from and toward the wing, a first guide unit and means mounting the first guide unit for extension and retraction movement with respect to the wing, a second guide unit, and means mounting the first guide unit for extension and retraction movement on the first guide unit, the second guide unit carrying the flap, the guide units having releasable coupling means whereby on initial extension of the actuator the two guide units are coupled together and move as one until the said position of intermediate extension is reached, but, on further extension of the actuator, they are uncoupled so that the second guide unit can be extended from the first guide unit to reach the said fully extended position.
Claim 3
Dependent Claim
29 words
A lift-increasing flap system according to claim 1 wherein the means mounting the first guide unit for movement with respect to the wing includes arcuate tracks engaged by rollers.
Claim 4
Dependent Claim
29 words
A lift-increasing flap system according to claim 1 wherein the means for mounting the second guide unit on the first guide unit also includes arcuate tracks engaged by rollers.
Claim 5
Dependent Claim
63 words
A lift-increasing flap system according to claim 1 wherein the releasable coupling means includes a latch arm pivotably mounted on one of the said guide units and a hook on tHe other of the said guide units, there being provided a cam surface on the wing positioned to cause engagement of the hook by the latch arm during initial extension of the actuator.
Claim 6
Dependent Claim
35 words
A lift-increasing flap system according to claim 1 wherein restraining means are provided to prevent the first guide unit from further extension movement with respect to the wing on release of the releasable coupling means.
Claim 7
Dependent Claim
33 words
A lift-increasing flap system according to claim 5 in which the restraining means comprises a further hook member mounted on the wing engageable by a further latch arm on the first guide unit.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |