Abstract: A shaft-type locking cylinder and dedicated key comprises a locking cylinder base, a main mount, a key, a plurality of tumbler pins, a plurality of springs, and a plurality of steel balls. The plurality of tumbler pins, springs and steel balls situated in the locking cylinder base are placed into a bore in the main mount, thereby enabling the fitting of an annular shoulder at the front end of the locking cylinder base into a first stepped rim in the main mount, the seating of a retaining ring in a second stepped rim to secure the locking cylinder base in the main mount and, furthermore, the concealment of the tumbler pins installed within the locking cylinder base. The said key further comprises a toggling barrel member having a plurality of differing-depth arcuate notches, a vertical slot in the toggling barrel member and a horizontal slot formed at one side of the vertical slot.

Abstract: An improved tubular-type locking cylinder and dedicated key that provides for both theft- and trip-resistant tumbler pin assemblies, wherein the locking cylinder is comprised of an outer housing, a main base, a locking cylinder shaft, and a plurality of tumbler pin assemblies. The improved features are that a detent slot is formed in the interior wall along the locking cylinder shaft recess through the center of the main base body. The locking cylinder shaft consists of a bore through the center of the shaft member up to its top extremity, a movably disposed catch bolt and spring, and a plug obstructing the opening of the bore. A horizontal passage for seating a steel ball is formed in the shaft member at the lower side of a tumbler pin disc. A locating pin is horizontally situated near the upper extremity at one side of the catch bolt. A keyway slot is formed in the shaft member that is contiguous to the upper end of the bore.