Aeronautics and astronautics – Landing gear – Retractable
Patent
1990-01-10
1991-06-11
Barefoot, Galen
Aeronautics and astronautics
Landing gear
Retractable
244102SL, B64C 2526
Patent
active
050226096
ABSTRACT:
The invention is a retractable landing gear for an aircraft. In detail, the landing gear includes a main strut having a first end pivotally attached to the airframe and a second end having a wheel assembly attached thereto. The main strut is rotatable about a pivot axis through an angle defined by the extended and retracted positions. a drag strut is pivotally attached by its first end to the airframe and by its second end to the main strut. The drag strut includes upper and lower strut members pivotally attached together at an intermediate point, with the intermediate point located angularly from the pivot axis of the main strut at an angle that is one half the angle rotated by the main strut from the extended position to the retracted position. An overcenter downlock and uplock linkage is provided for locking the main strut in either the extended or retracted position. The linkage includes a first link having a first end pivotally attached to the airframe with an axis of rotation coincident with the rotational axis of said main strut. A second link is pivotally attached by its first end to the drag strut at the intermediate point and pivotally attached at its second end to the second end of the first link. Additionally, a mechanism to actuate the downlock and uplock linkage prior to rotation of the main strut and a mechanism to rotate the main strut back and forth from the extended and retracted positions are provided.
REFERENCES:
patent: 2661171 (1951-11-01), Allen
patent: 2826381 (1958-03-01), Cruz
patent: 2869806 (1959-01-01), Beach
patent: 2963246 (1960-12-01), Mitrovich
patent: 2967033 (1961-01-01), Langdon
patent: 3121547 (1962-02-01), Paxhia et al.
patent: 3198461 (1965-08-01), Beach
patent: 4328939 (1982-05-01), Davies et al.
Barefoot Galen
Dachs Louis L.
Lockheed Corporation
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