Aeronautics and astronautics – Landing gear – Retractable
Patent
1977-02-03
1978-05-09
Barefoot, Galen L.
Aeronautics and astronautics
Landing gear
Retractable
244104FP, 267 64R, B64C 2522, B64C 2560
Patent
active
040882861
ABSTRACT:
A shock-absorber of the piston-and-cylinder kind for use in the landing gear of an aircraft and comprising a cylinder, a piston-rod and a shock-absorbing rod which encloses a chamber for compressed gas and is provided with a valve having a throttling orifice, in which the shock-absorbing rod is mounted to slide, in a fluid-tight manner, in a first chamber, filled with hydraulic fluid, of the cylinder or of the piston-rod, to form a oleopneumatic shock-absorber; the piston-rod is mounted to slide, in a fluid-tight manner, in the cylinder and is solidly connected to a piston-head which, with the cylinder, defines a descent chamber to control lowering of the landing gear when hydraulic fluid is admitted to the descent chamber; the shock-absorber also comprises a lifting piston to load the shock-absorber and mounted to slide within a second chamber of the cylinder or of the piston-rod, so defining a lifting chamber to control lifting of the landing gear when hydraulic fluid is admitted to the lifting chamber through a hydraulic locking valve having a pressure-controlled opening, and a locking device for locking the piston-rod in relation to the cylinder, in the "landing gear down" position, the locking device being releasable either by the application of the lifting pressure to the landing gear, which simultaneously pressurizes the lifting chamber, by displacement of the lifting piston which loads the shock-absorber, and voids the descent chamber by displacement of the piston-rod in the cylinder, or by the application of a simple pressure for releasing the locking device, thus permitting the piston-rod to be displaced in the cylinder under the action of the weight of the aircraft which thus moves the landing gear into a dropped position when the descent chamber is voided, the movement from the dropped position or the "landing gear retracted" position being effectable solely by applying a descent pressure simultaneously in the descent chamber and at said locking valve, so as to open the locking valve.
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patent: 3426651 (1969-02-01), Arendarski
Masclet Jean
Veaux Jacques
Barefoot Galen L.
Messier-Hispano S.A.
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