Patent ID: 6131428
Filing Date: 2000-10-17
Classification: E05B,Y10T

Abstract:
A changeable combination lock for a safe door comprising:a. a drive cam carrying teeth selectively engaging corresponding teeth on a drive tumbler in response to the operation of an actuator extending into a rear panel of the door, the drive tumbler being mounted on a rearward region of a lock spindle extending through a lock bushing mounted in the door;b. a clutch controlling the selective engagement in response to the actuator, an axially slidable portion of the clutch carrying teeth that engage corresponding teeth on one of the drive cam and the drive tumbler, disengagement of the clutch allowing relative rotation of the drive cam and drive tumbler so that the combination of the lock can be changed;c. a lock knob fixed on a forward end of the lock spindle, the lock spindle extending from a forward region of the door to a rearward region of the door; andd. a driven tumbler mounted on a rearward region of the lock bushing and engaging the drive tumbler, the drive and driven tumblers each including a gate notch arranged such that the gate notches are aligned when a predetermined combination is dialed using the lock knob, rotation of the knob after alignment of the gate notches and disengagement of the clutch altering the combination of the lock.