Abstract: A security door assembly adapted for securing a single or double door in locking engagement with an adjacent door jamb structure. In the interior of a hollow door is located a locking assembly which includes a rotatably mounted plate member and a plurality of elongate locking members. The locking members have their proximal end portions connected to the plate member with respective distal end portions of the locking members being positioned for protruding through respective peripheral edges of the door. An operating level located on one face of the door is connected to the plate member to permit rotating the same inside the door. When the plate member is rotated, the respective locking members are moved longitudinally to protrude from the respective peripheral edges of the door and engage the adjoining door jamb structure and floor to lockingly secure the door in place.

Abstract: A security lock device for a side-by-side pair of hinged double doors which permits securely locking the doors to the opposing door jambs and to one another to thereby secure the same against forced entry. The security lock device comprises a pair of locking bar assemblies mounted on a common face of the pair of doors and extending generally horizontally thereacross. Each locking bar assembly includes an elongate central mounting bar extending widthwise of the door with a pair of slidable bars mounted along opposite sides of the central mounting bar and adapted for longitudinal sliding movement between a retracted unlocked position and an extended locked position. When in the extended locked position, the slidable bars interlockingly engage one another at the opposing inside edges of the doors where the doors meet and also engage the door jambs along the outside edges of the door to thereby maintain the pair of double doors in a tightly locked position.