Neutral position locking system for aircraft control surfaces

Details Neutral position locking system for aircraft control surfaces Neutral position locking system for aircraft control surfaces

1987-12-18

1990-06-05

Basinger, Sherman D.

Aeronautics and astronautics

Aircraft control

Pilot operated

244 75A, B64C 1314

Patent

active

049307304

ABSTRACT:
An automatic neutral position locking system for a control surface of an aircraft. A hydraulic prime mover is provided for moving the control surface. A locking device is capable of locking the control surface against movement. A ratchet-and-pawl device is operatively associated with a rotary drive train between the prime mover and the control surface for actuating the locking device in response to the control surface reaching a neutral position. The ratchet-and-pawl device normally is maintained in inactive condition when hydraulic pressure exists in the prime mover. A pneumatic piston-and-cylinder device, when under pressure, maintains the ratchet-and-pawl device in normally inactive condition. With a loss of hydraulic pressure, the ratchet-and-pawl device is effective to actuate the locking device in response to the control surface itself reaching the neutral position as the control surface moves under external loads.

REFERENCES:
patent: 2528645 (1950-11-01), Edwards
patent: 2835459 (1958-05-01), Stewart
patent: 3599507 (1971-08-01), Exton
patent: 3662550 (1972-05-01), Lichtfuss
patent: 3943713 (1976-03-01), Walton
patent: 4173322 (1979-11-01), Macdonald
patent: 4496121 (1985-01-01), Berlin
patent: 4498647 (1985-02-01), Boehringer et al.
patent: 4526058 (1985-07-01), Runkel et al.

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