Abstract: A changeable combination, axial pin tumbler lock is operable by means of a cylindrical service key. Set keys are used to change the tumbler combination and thereby provide for operation of the lock by a different service key. The lock includes a fixed cylindrical barrel with twelve tumbler passages in opposed relation with a rotatable plug and barrel having seven tumbler passages. One half of the passages of the fixed barrel store reserve tumblers. A single shear interface is defined by the plug barrel and fixed barrel. Transfer of reserve tumblers from the fixed barrel passages to the plug barrel passages by means of set keys effects a combination change.

Abstract: An improved lock assembly includes a sleeve which is attached to a drawer or door by an original equipment manufacturer of desks, cabinets or the like. A cylinder lock may be installed in the sleeve by insertion in the sleeve with a retainer member. The retainer member includes a tab cooperative with a slot in the lock and an arm which projects through a slot in the sleeve to engage a tang on the sleeve that holds the retainer sleeve and lock together in assembly.

Abstract: A lock device includes a housing and a removable cylinder normally retained in the housing by a rotatable retainer ring. The retainer ring is driven by a shifter and cylinder change key between a locked and unlocked position. The retainer ring is normally biased to the locked position so that tabs associated with the retainer ring will engage appropriate locking channels of the cylinder and retain the cylinder in fixed position in an opening of the housing.