Aeronautics and astronautics – Aircraft sustentation – Sustaining airfoils
Patent
1993-04-12
1994-09-27
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft sustentation
Sustaining airfoils
B64C 356
Patent
active
053501357
ABSTRACT:
A folding wing tip (14) on an aircraft (2) carries a lug (16) that moves into alignment with lugs (6, 10) on the inboard wing portion (4) as the wings spread. The lug (16) pivots an inhibitor (28) that is interconnected by linkage to a valve spool (122). The pivoting of the inhibitor (28) causes the spool (122) to shift its position so that a sense port is brought into communication with a return port. Return pressure in the sense port indicates a spread wing condition. When the wing tip (14) is folded, springs move the inhibitor (28) and the valve spool (122) back to their original positions. This communicates the sense port with a pressure port to indicate a folded wing condition. The spool (122) is preferably also biased into its original position by fluid pressure. In addition, the lug (16) has a cam (92) that engages a roller (84) carried by the inhibitor (28) when the wing tip (14) is moved into a folded position. Abutment of the cam (92) and roller (84) pivots the inhibitor (28) back into its original position.
REFERENCES:
patent: Re22435 (1944-02-01), Evans
patent: 2280809 (1942-04-01), Evans
patent: 3425731 (1969-02-01), Elmore
patent: 3989267 (1975-11-01), Robinson
patent: 4225004 (1980-09-01), Lipshield
Renzelmann Michael E.
Smith Mark H.
Barefoot Galen L.
Pauly Joan H.
The Boeing Company
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