Abstract: An apparatus comprising a baseplate configured to be coupled to a door configured to be positioned in an open door position, a closed door position, and a plurality of door positions in between the open position and closed position; a motor; a circuitry electrically coupled to the motor and configured to be in communication with a remote computing device; at least one proximity sensor electrically coupled to the circuitry and configured to determine the door position with respect to a door frame; a drive wheel coupled to the motor and the circuitry, the drive wheel comprising an external surface, the external surface of the drive wheel configured to rotatably contact a ground surface; and wherein the motor is configured to be remotely activated by the remote computing device to engage the drive wheel to rotatably contact the ground surface to reposition the door responsive to receipt of a signal.

Abstract: An emergency door closing device that can be installed upon existing doors and hinges to automatically close doors in the response to smoke and fire. The improvements incorporated therein include a hinge cam pivot member that attaches to an existing hinge member of a door and produces a moment force about the existing hinge member allowing a reduced force necessary to pivot the door into a closed position. Further, a novel spring, cam, and lever system is incorporated to activate the moment force to close the door.