Patent ID: 7802488
Filing Date: 2010-09-28
Classification: B64C,F16H,Y10T

Abstract:
1. A telescopic actuator comprising a cylinder in which a main rod is mounted to slide telescopically along a sliding axis X between a retraced position and an extended position, the telescopic actuator including an auxiliary rod mounted to slide telescopically in the main rod along said sliding axis between a retracted position and an extended position, the actuator including controlled retaining means carried by the main rod and by the auxiliary rod for retaining the auxiliary rod in the retracted position inside the main rod, and wherein said retaining means are carried by the main rod and by the auxiliary rod, and comprises controlled sliding means for controlling sliding of the main rod in the cylinder, said controlled sliding means comprising: a motor member; a lead screw extending along the sliding axis and rotatably mounted on the cylinder so as to be driven in rotation by the motor member; a nut secured to the main rod and co-operating with the lead screw; and antirotation means for preventing the main rod from rotating relative to the cylinder, and in which the lead screw has one end guided by a first ball joint mounted on the cylinder, and another end guided by a second ball joint slidably mounted in the auxiliary rod.