Double hinged security system

A security screen assembly installable in a jamb of a building for preventing unauthorized access therethrough when in a secured position and for allowing egress from the building when in an open position, said security screen assembly comprising:

• a screen having a height, a width, and side edges, said screen comprising a screen frame with a perforated metal sheet disposed therein;
• a frame dimensioned to fit within a jamb of a building and being attachable to the jamb, said frame defining an opening having a height substantially equal to the height of said screen and having a width which is less than the width of said screen;
• a channel formed on a rear surface of said frame and surrounding the opening in said frame for accommodating said screen, wherein said channel prevents said screen from being swung inward;
• a continuous double hinge attached to said frame and to one of the side edges of said screen, said hinge extending along substantially the entire length of the side edge of said screen, whereby said screen is slidable in said channel from a secured position, wherein the side edges of said screen are trapped behind said frame, to an unsecured position, wherein the other of the side edges not attached to said hinge is not trapped behind said frame and said screen can be swung out at an angle relative to said frame to an open position;
• a locking mechanism attached to said frame, whereby said locking mechanism retains said screen in the secured position when said screen is slid within said channel to the secured position and whereby said locking mechanism is releasable to allow said screen to be slid within said channel to the unsecured position;
• and
• a spring attached to said frame within said channel biasing said screen toward the unsecured position, and wherein when said locking mechanism is released, said spring causes said screen to slide within said channel to the unsecured position.