Abstract: A security bar maintaining the closure of a hinged door has telescoping inner and outer sections, with the opposite ends of this assembly engaging receptacles in a door jamb or the wall structure adjacent the door opening. Aligned transverse holes in the inner and outer sections are engaged by a release pin to maintain the bar in engagement with the receptacles to prevent unauthorized opening of the door. A spring pulls the bar sections to a shorter overall length on removal of the release pin to permit the bar to fall away from the receptacles for emergency exit.