Automatically locking linear actuator

An automatically locking actuator, comprising:

• a first end connector;
• a rotatable drive screw operably coupled to the first end connector;
• a nut assembly threadably mounted on the drive screw;
• a second end connector operably coupled to the nut assembly;
• a rotary lock comprising a rotor and at least one key assembly that moves between extended and retracted positions in response to rotation of the rotor;
• a keyway assembly having at least one keyway for receiving the at least one key assembly in the extended position;
• and
• a lost motion connector rotationally coupling the nut assembly to the rotary lock in a configuration such that rotation of the drive screw results in an initial rotation of the nut assembly and rotor to move the key assembly between the extended and retracted positions, followed by axial movement of the nut assembly along the drive screw in response to continued rotation of the drive screw,
• wherein rotation of the drive screw while the key assembly is in the keyway results in moving the key assembly radially inward and axially moving the nut assembly along the drive screw.