Patent ID: 6928894
Filing Date: 2005-08-16
Classification: F15B,Y10T

Abstract:
1. An actuator comprising: a cylindrical body; a piston adapted to slide relative to said body; means for transmitting mechanical power to said piston, comprising a non-reversible screw and nut motorized system linked to said piston and adapted for controlling a position of said piston; and means for transmitting hydraulic power to said piston, using a fluid under pressure, said means for transmitting mechanical power and said means for transmitting hydraulic power being adapted to act in parallel with each other on the piston, said hydraulic power being supplied by a hydraulic energy reservoir connected to a single volume defined by a wall of the piston, a hydraulic circuit comprising a pipe being connected between said reservoir and said volume, said hydraulic reservoir being adapted to recover, hydraulic power, said non-reversible screw and nut motorized system constituting a fail safe device for locking the position of the piston, and said non-reversible screw and nut motorized system constituting a synchronizing mechanism for a multi-actuators system.