Aeronautics and astronautics – Landing gear – Retractable
Patent
1975-12-22
1977-09-13
Blix, Trygve M.
Aeronautics and astronautics
Landing gear
Retractable
B64C 2512
Patent
active
040476812
ABSTRACT:
In a landing gear of the type that includes a pivotally retractable shock strut, the overall length of the strut is shortened during retraction by a mechanism that is effective to force the shock strut piston to telescope into the shock strut cylinder. The mechanism includes a multiple section, foldable brace which when the landing gear is down functions to rigidify the shock strut and which during retraction folds into a compact, collapsed configuration. One end of the brace is pivotally connected to a collar which in turn is coaxially, rotatably mounted on the strut cylinder, while the other end of the brace is pivotally connected to a support point located on the underside of the wing and offset to one side of the plane of rotation of the strut so that the brace resides at a skewed angle to such plane. As the strut is rotatively retracted, the brace folds toward a collapsed configuration, and because of the brace's skewed mounting location it acts to apply a rotative force to the collar, rotating the collar about the axis of the strut cylinder. A special, reactive linkage is connected between the collar and a modified torque linkage (that interconnects the strut's piston and cylinder), to convert the aforementioned collar rotation into a force moment on one of the links of the torque linkage for telescopically compressing the piston into cylinder and thereby shortening the strut as the gear is retracted.
Blix Trygve M.
Kelmachter Barry L.
The Boeing Company
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