Link 3 with wheel d turns about fixed axis 0-0 of a frame member of the aircraft. Link 1 is connected by spherical pair A to link 3 and by a sliding pair to link 2 which, in turn, is connected by spherical pair B to the frame member. When piston 1 moves into cylinder 2, link 3 is turned about axis 0-0 to retract the landing gear.
$1414$LG,AL$