Retraction cylinder and rotorcraft undercarriage furnished...

Details Retraction cylinder and rotorcraft undercarriage furnished... Retraction cylinder and rotorcraft undercarriage furnished...

2011-07-26

2011-07-26

Dinh, Tien (Department: 3644)

Aeronautics and astronautics

Landing gear

Wheel

C244S1020SS, C244S1020SS

Reexamination Certificate

active

07984873

ABSTRACT:
A retraction cylinder (20) makes it possible to retract a leg (10) of a rotorcraft landing gear, the retraction cylinder (20) comprising a retraction chamber (33) and an extension chamber (34) separated by a head (26) of a piston (25), the piston (25) sliding in a cylindrical sheath (35). In addition, the retraction cylinder (20) comprises a return element (23) and a control chamber (22) furnished with a first fluid, this control chamber (22) being separated from the return element (23) by a movable release member (24), the movable release member (24) sliding so that the retraction cylinder (20) fulfils a damping function when a control pressure exerted by the first fluid on the movable release member (24) is greater than a return pressure exerted by the return element (23).

REFERENCES:
patent: 4907760 (1990-03-01), Sealey et al.
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patent: 6059228 (2000-05-01), Koizumi et al.
patent: 6676076 (2004-01-01), Davies
patent: 7720582 (2010-05-01), Makinadjian
patent: 2008/0111022 (2008-05-01), Lahargou et al.
patent: 2010/0187353 (2010-07-01), Masson et al.
patent: 2687123 (1993-08-01), None
Search Report of Jun. 24, 2008, in French priority application.

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