Code wheel combination lock

A code wheel combination lock, comprising:

• a knob that is rotatable relative to a face plate, the knob having an accommodation cavity, the face plate being pivotally connected to the accommodation cavity;
• a lock tongue, mounted to a side wall of the accommodation cavity;
• and
• a code wheel assembly;
• including:
• a base having a movement cavity, the base being mounted to the face plate and located in the accommodation cavity;
• a code wheel shaft, passing through the movement cavity and being movable axially relative to the movement cavity, in cooperation with the lock tongue to realize unlocking and locking;
• a plurality of sets of bushings and code wheels, the bushings being sleeved on the code wheel shaft and being selectively stationary or rotatable relative to the code wheel shaft along with axial movement of the code wheel shaft, the code wheels being disposed corresponding to the bushings and selectively rotating together with the bushings or rotating relative to the bushings;
• a reset mechanism, configured to reset the code wheels;
• a positioning member, mounted to the base and disposed opposite to the code wheels for restricting reset of the code wheels;
• a protection frame, mounted to the base, the protection frame being movable axially relative to the base for changing the code wheels to rotate together with the bushings or to rotate relative to the bushings;
• wherein relative rotation of the knob and the face plate drives the code wheel shaft and the protection frame to move axially and enables the positioning member to restrict or unlock rotation of the code wheels so that the knob can be rotated relative to the face plate to a first position, a second position, or a third position;
• in the first position, the code wheel shaft cannot move and is mutually restricted with the lock tongue, when a password is correct, the bushings can rotate relative to the code wheel shaft, the code wheels can rotate together with the bushings, and the positioning member restricts reset of the code wheels;
• in the second position, the bushings can rotate relative to the code wheel shaft, the code wheels can rotate together with the bushings, and the positioning member doesn't restrict reset of the code wheels, so as to achieve automatic code wheel reset;
• in the third position, the bushings being stationary relative to the code wheel shaft, the code wheels can rotate relative to the bushings, and the positioning member restricts reset of the code wheels, so as to achieve manual password setting.