Patent ID: 7686354

Claim:
An apparatus for use with a door providing access to a secure area, the door having a first door bolt movable with respect to the door, the first door bolt being engageable and disengageable with a structure to respectively lock and unlock the door, the apparatus comprising: a lock bolt adapted to be supported by the door, the lock bolt comprising a proximal end, and a distal end adapted to be contacted by the first door bolt, the first door bolt being operable to move the lock bolt in a first direction; a first pawl pivotally mounted on the distal end of the lock bolt, the first pawl adapted to be pivotable by the first door bolt prior to the lock bolt being movable by the first door bolt; a wedge block movably mounted on the lock bolt, the wedge block being movable relative to the lock bolt by the first pawl from a first position blocking a pivoting of the first pawl to a second position allowing the first pawl to pivot; and a stop member located adjacent the wedge block and being movable between a first location blocking motion of the wedge block from the first position, thereby blocking pivotal movement of the first pawl and thus, adapted to prevent the first door bolt from being disengaged from the structure and maintaining the door locked, and a second location unblocking motion of the wedge block from the first position, thereby unblocking pivotal movement of the first pawl and thus, adapted to permit the first door bolt to be disengaged from the structure and the door to be opened.