Key-controlled, combination changing, permutation lock

Claim 1

A COMBINATION LOCK COMPRISING, A LOCK CASING HAVING AN OPENING THEREIN, A LOCK BOLT RECIPROCALLY MOUNTED THROUGH THE CASING OPENING AND HAVING AN INTEGRAL PORTION EXTENDED INTO THE CASING, A SPRING REACTING AGAINST A PORTION OF THE LOCK BOLT TO YIELDINGLY URGE IT TOWARD ITS PROJECTED POSITION, A PLURALITY OF SUPERIMPOSED TUMBLER DISCS ROTATABLY MOUNTED WITHIN THE CASING AND FORMED WITH REGISTERING GATES, CERTAIN OF THE DISCS HAVING NOTCHED PERIPHERAL PORTIONS, MEANS INCLUDING A KNOB FOR TURNING SAID DISCS TO A PREDETERMINED POSITION WHEREIN THEIR GATES ARE IN REGISTRATION, A LEVER RETAINING PLATE CARRIED BY THE EXTENDED PORTION OF THE LOCK BOLT TO YIELDINGLY RECIPROCATE THEREWITH, A SPRING BIASED DRIVE LEVER PIVOTALLY MOUNTED ON SAID LEVER RETAINING PLATE AND HAVING A PORTION ENGAGEABLE WITH THE GATES OF THE TUMBLER DISCS WHEN THE LATTER ARE IN A PREDETERMINED POSITION OF REGISTRATION, A SPRING BIASED UPSET LEVER ALSO PIVOTALLY MOUNTED ON THE LEVER RETAINING PLATE AND HAVING A PORTION ENGAGEABLE WITH THE TUMBLER DISC NOTCHES TO TURN AND UPSET THE SAME WHEN THE BOLT IS MOVED FROM ITS RETRACTED TO ITS EXTENDED POSITION, A KEY-RECEIVING