Locking device for door of safe

摘要

A locking device for a door (1) of a safe has at least one key lock or combination lock which releases the operation of a key-bolt (2) in the unlocked state. The key-bolt is connected to an electromechanical final control element (20) in front of which is wired a time delay circuit (22) that is inaccessible when the door is closed and whose activation input is connected to a switch (13) located outside the secured space. It has key-bolt connected to time delay circuit that is inaccessible when door is closed and activated by external switch The delay time of this circuit can be adjusted via adjusting elements inaccessible with the door closed. The delay time fluctuates inside adjustable limits according to the random principle. The time delay circuit receives a return pulse on operation of the lock to open the door.