Abstract: A combination lock having a selectable combination is provided wherein the combination cannot be changed when a case to which the lock is attached is closed. The lock has a slidable shaft with a plurality of sockets rotatable about said slidable shaft and the sockets are axially movable with the shaft and maintain their relative axial position on said shaft. There are a plurality of rollers connected to the sockets and each roller has one of the sockets associated therewith. The sockets and shaft are axially movable with respect to the rollers and rotating at least one roller relative to its associated socket varies the combination. The lock has an axially movable frame and a closer associated with the frame which can move the frame in one direction to open and close the case and in the other direction to place the lock in position to change the combination.

Abstract: A code changing mechanism for padlocks of the type comprising code wheels and lock operating bushings releasably connected to the code wheels in which axial movement of the shaft disengages the bushings from the code wheels to permit changing of the code, and in which the long leg of the shackle has means for engaging the end of the shaft to move it axially to the disengaging position when the shackle is depressed into the body in an orientation other than the locking orientation. In one embodiment of the invention the shackle can be locked in the open position to prevent code changing without knowledge of the existing code.