Aeronautics and astronautics – Aircraft control
Patent
1982-09-21
1985-01-29
Blix, Trygve M.
Aeronautics and astronautics
Aircraft control
244224, 244 78, B64C 1314, B64C 1342
Patent
active
044961219
ABSTRACT:
A control surface lock (10) for flutter constraint of a control surface (14) of an aircraft in cooperative combination with an hydraulic actuator (12), wherein system pressure on the actuator maintains the lock in a dynamically bypassed configuration and loss of system pressure causes the lock to assume a constraint configuration providing a stiff link with the control surface, is comprised of a locking piston (82) secured to the control surface and disposed for reciprocable movement in a locking cylinder (90) upon actuation of the surface, first and second charged locking chambers (92, 94) within the cylinder disposed for series flow of fluid from one to the other upon movement of the locking piston through a bypass valve (100) biased to an open position and a flow splitter (74) having a parallel flow path from the actuator to serve for fluid exchange; wherein loss of system pressure interrupts the series flow and locks the piston in the constraint configuration for flutter protection of the control surface.
REFERENCES:
patent: 2664255 (1953-12-01), Crandall et al.
patent: 3220317 (1965-11-01), Fuell
patent: 3426650 (1969-02-01), Jenney
patent: 3477347 (1969-11-01), Rice
patent: 3943968 (1976-03-01), Treichler
patent: 4320691 (1982-03-01), McWilliams
Blix Trygve M.
Corl Rodney
The Boeing Company
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