Abstract: A shock absorber comprises a piston and piston rod assembly mounted for reciprocation in a cylinder, the piston dividing the cylinder into upper and lower chambers, a floating disk valve slidably disposed in a fluid reserve chamber of the piston for movement between first and second positions to selectively open and close fluid passages associated with the assembly to vary the resistance to damping fluid moving through the assembly and between the chambers, and a solenoid-plunger for regulating the flow of damping fluid between the chambers. The disk valve movement is controlled by the solenoid-plunger and when the disk is in a first position augments flow between the upper and lower chambers to provide "soft" compression and rebound strokes and when the disk is in a second position restricts flow between the upper and lower chambers to provide "firm" compression and rebound strokes.

Abstract: The rotary actuator includes at least a precompressed spring assembly comprising a compression coil spring the ends of which are engaged by flanged cups adapted to limit the spring extension and carried slidably on a pin provided, at each end, with a circlip which prevents the cups from coming off the pin itself.

Abstract: A system for spinning up a nose wheel of an airplane equipped with a Fixed Slip Hydraulic Anti-Lock Braking System, incorporated in the airplane's anti-lock system. The system includes a main wheel pump coupled to a main wheel which is hydraulically coupled to a nose wheel pump-motor.