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An actuator assembly for moving a device between a retracted and extended position in which a ball screw is connected to the device and is in threaded engagement with a ball nut so that, upon rotation of the ball nut, the ball screw moves between a retracted and an extended position. A gear train is

An actuator assembly for moving a device between a retracted and extended position in which a ball screw is connected to the device and is in threaded engagement with a ball nut so that, upon rotation of the ball nut, the ball screw moves between a retracted and an extended position. A gear train is connectable between a power source and the ball nut for transferring torque therebetween to rotate the nut member, and a control system responds to a relatively low power input for selectively connecting the drive assembly between the power source and the ball nut member.

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[ What is claimed is:] [1.] An actuator assembly for moving a device between a retracted and extended position, the assembly comprising a nut member, a ball screw adapted to be connected to the device, the ball screw being in threaded engagement with the nut member and movable from a retracted to an

[ What is claimed is:] [1.] An actuator assembly for moving a device between a retracted and extended position, the assembly comprising a nut member, a ball screw adapted to be connected to the device, the ball screw being in threaded engagement with the nut member and movable from a retracted to an extended position upon rotation of the nut member, a member for producing torque, a drive assembly adapted to be operatively connected between the torque producing member and the nut member for transferring the torque therebetween to rotate the nut member, and a control system for selectively connecting the drive assembly between the torque producing member and the nut member, the control system comprising an inner race operatively connected to one of the members, a driver operatively connected to the other member and having a bore, a wrap spring extending around a portion of the inner race and a portion of the driver, and a control module extending in the bore and adapted to rotate in the bore, the control module being responsive to an input signal for engaging the inner wall of the driver defining the bore at multiple areas thereof for latching to the driver, the wrap spring being connected to the inner race and to the control module so that, upon actuation of the torque producing member, the inner race, and therefore the wrap spring and the control module, rotate relative to the driver, and, in response to application of the input signal, the control module latches to the driver to tighten the wrap spring around the inner race and the driver to couple the inner race to the driver and transfer the torque from the output shaft to the nut member to rotate the nut member.