Combination disk lock comprising means for automatic scrambling on locking

A lock mounted on a door and comprising a bolt movable in a straight line between an extended position and a retracted position;

• means for urging the bolt to its extended position;
• means for pulling the bolt from its extended position to its retracted position, movably coupled to the bolt;
• a combination disk comprising a notch and stop means, mounted for rotation on a shaft;
• a drive disk mounted for rotation on said shaft, comprising stop means cooperating with those of the combination disk in a given relative angular position of these disks, and first means for cooperating with said traction means of the bolt;
• means for rotating the drive disk;
• second means for cooperating with said traction means of the bolt, adapted so as to be received in said notch in a given angular position of the combination disk obtained by actuating operating means in accordance with a coded combination, these second means being movable between a position in which they are situated outside the notch and hold the traction means of the bolt away from the drive disk and a position in which they are situated in the notch and allow cooperation between the traction means of the bolt and said first means of the drive disk, the bolt being then movable to its retracted position by rotation of the drive disk, which lock further comprises:
• means adapted for locking the bolt in its retracted position, which comprise said bolt defining a stop means and a rocking lever mounted for pivoting in the lock and urged resiliently towards the bolt and stop means mounted on the rocking lever and adapted for cooperating with said stop means provided on the bolt;
• means for moving said traction means of the bolt away from the drive disk when the bolt is in its retracted position;
• means adapted for unlocking the bolt once the door has been opened then closed again, by cooperating with a door casing or a mobile keeper during closure of the door so as to cause the rocking lever to pivot and said stop means of the rocking lever to be moved away from the bolt;
• and
• a door closure mechanism mounted on the door at the side of the bolt, this mechanism comprising a bar system cooperating with a casing of the door and means for operating this bar system which comprise said keeper mounted for moving in front of the bolt, the bolt passing through said keeper in its extended position so as to lock said bar system operating means, said means for unlocking the bolt being adapted for cooperating with said keeper when this latter moves at the time of closing the door for unlocking the bolt.