Abstract: A small re-combinate lock for equipment and furniture such as desks and cabinets. The lock is comprised of a generally cylindrical shell and a removable plug rotatably mounted inside of the shell. The plug has a core and a plurality of multi-piece tumblers slideably mounted in the core. Each tumbler is an assembly comprised of a wafer holder and a combining wafer removably mounted at an end portion of the wafer holder. A wafer support ring is mounted on the core adjacent to one side of each tumbler and a rotatable wafer carrier is mounted on the core adjacent to the opposite side of the tumbler. The wafer support ring is keyed to the core and the wafer carrier is rotatable on the core. In each wafer carrier there are a plurality of coded wafers which can be exchanged with the combinating wafer of an adjacent tumbler. To re-combinate the lock, the plug is first removed from the shell with a master key.

Abstract: A key-operable lock having a releasable plug which is rotatable from a locked condition to an unlocked condition. The plug is removable from a fixed mounting member only in the unlocked condition and is blocked for removal in the locked condition by the combined effects of a master key-operable tumbler which is slideable in the plug and a boss which is fixed to the plug. In the locked condition, the boss and one end portion of the control tumbler extend outwardly from the plug to engage a fixed mounting member and the diametrically opposite end portion of the tumbler is inside of the plug. When a master key is inserted into the lock and the plug is rotated to the unlocked position both end portions of the control tumbler are inside of the plug; the boss is aligned with a slot of the mounting member and the plug is free to be removed from the fixed mounting member.