Patent ID: 7424814

Claim:
A dead bolt locking system for use on a door leading to a secure area, the dead bolt locking system comprising: a housing structure adapted to be mounted on an inside of the door; a dead bolt mounted in the housing structure for movement between extended and retracted positions; a lock operatively connected with the dead bolt and controlled by the input of correct unlocking information to allow movement of the dead bolt from the extended position to the retracted position; dead bolt retracting structure operatively connected to the dead bolt such that when the lock is unlocked, at least a portion of the dead bolt retracting structure is operative to allow retraction of the dead bolt and, when the lock is locked, operation of the dead bolt retracting structure is prevented thereby preventing retraction of the dead bolt; and an inertia assembly mounted to the housing structure, the inertia assembly having an actuator weight configured to rotate and translate relative to a pivot axis during the application of a shock load and a bolt lock lever configured to rotate about the pivot axis when the actuator weight translates relative to the pivot axis, the bolt lock lever including a portion that has a contacting relationship with a portion of the dead bolt, when the actuator weight and the bolt lock lever rotate about the pivot axis, to prevent movement of the dead bolt from the extended position to the retracted position and that has a non-contacting relationship with the portion of the dead bolt in the absence of the shock load.