A rekeyable lock cylinder with a cylinder body and a plug assembly. The lock cylinder includes a plurality of key followers and a corresponding plurality of racks disposed in the plug assembly. Disengaging the racks from the key followers allows rekeying of the lock cylinder.

An exemplary lock apparatus includes a housing and a plug assembly rotatably mounted in the housing. The plug assembly includes a tumbler assembly operable to selectively prevent rotation of the plug assembly relative to the housing and a retention mechanism operable to selectively prevent removal of the plug assembly from the housing. A system including the lock apparatus may include a change key configured to actuate the tumbler assembly without actuating the retention mechanism and/or a control key configured to actuate both the tumbler assembly and the retention mechanism.

The locking cylinder has a stator and a rotor, which can rotate in the stator and has a key opening into which a key can be inserted. The locking cylinder has a multiplicity of tumbler-mating-tumbler pairs, wherein each of the tumblers has a first part and a second part that are connected to one another, for example, with a press fit. In the method for programming a locking cylinder, the locking cylinder has at least one two-part tumbler, having parts that are connected to one another with a press fit. In the method, when a key is introduced into the key opening a length, effective in terms of locking, of the tumbler is changed by the first part and the second part sliding one into the other or moving apart from one another, in particular is reduced by them sliding one into the other.

A mechanically reprogrammable cylinder lock includes a magnetic tool to provide reprogramming.

A reprogrammable lock cylinder including a stator, a rotor rotatably mounted in the stator, a tumbler assembly mounted in the rotor and operable to permit rotation of the rotor when a first key is inserted into the rotor, the tumbler assembly having a reprogramming state in which the tumbler assembly is operable to be reprogrammed by a second key to match the second key, and an insert configured to cause the tumbler assembly to adopt the reprogramming state in response to presentation of a magnetic tool to the rotor, and to prevent the tumbler assembly from adopting the reprogramming position in absence of the magnetic tool.

A housing configured to accept a rekeyable lock core for use in lockable enclosures. The housing is configured to use a lock core that is designed for deadbolt and door lever/knob operation. The housing allows a rekeyable lock cylinder to be used in one's home as well as other enclosure enclosures. A common key may therefore be used for all devices as the lock core is of a rekeyable design.

A self-learning lock cylinder assembly or lock tumbler and tools capable of teaching the self-learning key configuration of a pre-existing key is disclosed. The assembly does not require disassembly and re-assembly of internal components by a skilled user. The individual performing the self-learning procedure sets the assembly by a simple rotation motion. The individual performing the self-learning procedure can verify that the original key and copies of the original key function properly within the lock cylinder prior to final assembly.

A rekeyable lock cylinder includes a plug body with a keyway opening along a longitudinal axis and a multiple of channels transverse to the axis. A rekeying feature located adjacent to the keyway opening.

A cylinder lock and key combination with a key slot and at least one dual tumbler assembly for locking a key plug against rotation. The dual tumbler assembly includes an outer pin movable elevationally in a chamber in the key plug, and an inner pin movable telescopically in a cylindrical bore in the outer pin. The outer pin is provided with at least one key contacting end portion for engagement with a first code portion of a key blade upon insertion thereof in the key slot. The inner pin is provided with at least one key contacting end portion, for engagement with a second code portion of the key blade. The key contacting end portions of the outer and inner pins of the tumbler assembly are located adjacent to each other at axially and radially well-defined code positions relative to a center-line of the tumbler assembly.

A system including a lock class having a plurality of lock families, with each lock family including a plurality of lock cylinders. Each of the lock families has a control pin location which is different from the control pin location of another of the lock families within the lock class. Each of the lock cylinders generally includes a shell, a plug rotatably mounted in the shell, and a control ring rotatably mounted on the plug at the control pin location of the lock family of which the lock cylinder is a member, and a control pin operable to selectively couple the plug with the control ring. Each lock family may be associated with a control key family. Each control key family may include a plurality of control keys, each of which may have a control bitting configured to urge control pins of the associated lock family to a coupling position.