A lockset includes a lock cylinder, a lock casing, a first lock member, a second lock member and an anti-theft member. The lock cylinder includes a key hole and a first lock slot. The lock casing includes a second lock slot. The first lock member is accommodated in the first lock slot. The second lock member is accommodated in the second lock slot. The anti-theft member is sandwiched in between the first lock member and the second lock member. When two ends of the anti-theft member are respectively located in the first lock slot and the second lock slot, the lock cylinder and the lock casing are locked. When a contact surface between the anti-theft member and the first lock member or the second lock member is aligned with a rotation interface between the lock cylinder and the lock casing, the lock cylinder and the lock casing are unlocked.

A dual-ring tubular lock assembly is provided. Inner and outer walls of a key are formed with inner-ring and outer-ring notches. A lock cylinder is inserted in a central through hole of a lock housing. A front end of the lock cylinder is formed with a tubular keyhole. The tubular keyhole is formed with inner-ring and outer-ring grooves corresponding to the inner-ring and outer-ring notches and mounted with inner-ring and outer-ring key pins. A rear end of the lock cylinder passes through a central perforation of a lower bead seat and extends out of the lock housing. The lower bead seat is fixed in the center through hole. The lower bead seat is formed with inner-ring and outer-ring holes corresponding to the inner-ring and outer-ring grooves and mounted with inner-ring and outer-ring driver pins and springs. The latch is fixed to the rear end of the lock cylinder.

A dual-ring tubular lock assembly is provided. Inner and outer walls of a key are formed with inner-ring and outer-ring notches. A lock cylinder is inserted in a central through hole of a lock housing. A front end of the lock cylinder is formed with a tubular keyhole. The tubular keyhole is formed with inner-ring and outer-ring grooves corresponding to the inner-ring and outer-ring notches and mounted with inner-ring and outer-ring key pins. A rear end of the lock cylinder passes through a central perforation of a lower bead seat and extends out of the lock housing. The lower bead seat is fixed in the center through hole. The lower bead seat is formed with inner-ring and outer-ring holes corresponding to the inner-ring and outer-ring grooves and mounted with inner-ring and outer-ring driver pins and springs. The latch is fixed to the rear end of the lock cylinder.

A tubular lock and its operating key have safety features that render the lock and key well suited for use with food freezer appliances and the like where the keyway of the lock extends horizontally. The tubular portion of the operating key, and the keyway of the tubular lock are cooperatively configured so a key inserted into the keyway of the lock fits quite loosely and is minimally supported even when fully inserted. The graspable bow of the operating key is made unusually long causing the center of gravity of an inserted operating key to be spaced far from the front face of the lockso the weight of the loosely fitting and minimally supported operating key levers the graspable bow downwardly, causing the key to drop from the keyway unless being held in the keyway. Gravity is optimally used to effect key ejection.

A pin tumbler lock apparatus includes a shell and a gate housed within the shell. The gate consists of a cylindrical case with multiple bores. A core, positioned within the gate, features a keyway and additional bores aligning with the gate's bores to form pin chambers when locked. Key pins within these chambers are magnetically responsive and vary in height within a defined range. Each key pin comprises a body and an oversized top element. Channels in the gate correspond to the pin chambers, allowing the top element of each key pin to move within its respective channel when a key is inserted into the keyway and the core is rotated relative to the gate.

A locking system may include a first cylinder portion may be extended along a main axis, a second cylinder portion may be extended along the main axis, a front plate may be coupled and rotatable with the first cylinder portion, a plurality of code pins, a plurality of spring-loaded driver pins, a main shaft may be disposed within a first central hole, a second central hole, and a key. The key may include an elongated key shaft and a plurality of key needles may be extended parallel with the elongated key shaft. The main shaft may be configured to be coupled to and rotatable with one of the first cylinder portion and the second cylinder.

A lock core and key assembly includes a core body, a core plug having a core plug insert-receiving aperture, a core plug insert positioned in the core plug insert-receiving insert, and a key. The core plug insert has a taper and the key has a bow and a shank with a taper that aligns with the taper of the core plug insert.

A lock core and key assembly includes a core body, a core plug having a core plug insert-receiving aperture, a core plug insert positioned in the core plug insert-receiving insert, and a key. The core plug insert has a taper and the key has a bow and a shank with a taper that aligns with the taper of the core plug insert

A lock core and key assembly includes a core body, a core plug having a core plug insert-receiving aperture, a core plug insert positioned in the core plug insert-receiving insert, and a key. The core plug insert has a taper and the key has a bow and a shank with a taper that aligns with the taper of the core plug insert