Abstract: A security operating device which mechanically connects a standard door knob to an added security device which may be used to prevent intrusion against that door. The security operating device converts the rotational motion of the door knob to lifting, pulling, or pushing motions which engage or disengage the additional security device. The internal lock in the door knob lock set is thereby also used to lock the added security device.

Abstract: A security door bar adapted to prevent the opening of a door by intruders and comprising a resilient metal bar which carries a polygon shaped block through which pressure is applied to the door. The metal bar being adjustable to the width of the door and the polygon shaped block being rotatable on the bar to adjust for door thickness and amount of pressure to be applied to the door. The metal bar is adapted to the door by use of a metal screw hook which is screwed into a wall stud on the knob side of the door and pressure is applied to the door from the metal bar through the polygon block and a pressure distribution sheet attached to the door.