DOOR-LOCKING MECHANISMS FOR SECURITY ENCLOSURES

摘要

A locking mechanism for a vault door having a plurality of independently negatable locks, each one coupled through its bolt to a respective pivoted locking arm. In the locking condition the arms are pivoted to block withdrawal of bars carried by the main boltstraps. Each lock bolt is connected to its arm by a rotatable control member having a lobe and an eccentric peg which engages in a slot in the respective arm. To negate a lock its bolt is thrown and a lever turned to rotate the respective control member. This places the lobe next to the lock case and pivots the locking arm into its unblocking position. If the door is left open with the boltwork withdrawn and unlocked unauthorized negation of a lock cannot take place because there is insufficient space to rotate the respective control member without the latter abutting the lock case. If the door is left open with the boltwork thrown and locked unauthorized negation might occur if access is gained to the mechanism, but this will be immediately apparent when the bank staff come to close the door at the end of the day as this procedure first involves withdrawing the lock bolts and the bolt of the negated lock will be blocked by the proximity of the control member lobe to the lockcase.