Abstract: The combination lock has a case which contains the lock mechanism including permutation discs. The case is mounted behind and protected by the locker door. An escutcheon plate is mounted on the front of the door with a rotary dial mounted therein. The rim of the dial has indicia to brought into registry with the fixed index on the escutcheon. The dial rim slopes at about 45.degree. to the rotational axis of the dial and this slope deflects lateral blows or impacts. The center of the dial is recessed and has pads engageable by the user to facilitate turning the dial.

Abstract: The cylinder lock has a key guide which has a cylindrical extension fitting inside a cylindrical shell. A number of tumblers fit in the tumbler plug which is mounted inside the extension so the lock tab on each tumbler can project through a slot in the extension into one of two lock grooves inside the shell. The cam surface on the proper key will move the lock tabs out of the groove so the key guide and the plug and the tumblers can rotate in unison inside the shell. The tumbler plug engages a bolt driver which is journaled in and projects rearwardly from the shell. The projecting portion is threaded and has a squared portion on which a bolt is mounted and retained by a nut threaded on the threaded portion. The shell is threaded and also has opposed flats registering and lock relative to a bracket which enables mounting the lock on the rear of a door with an escutcheon plate on the front of the door.