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 key for use in a cylinder lock with a rotatable key plug having an elongated key blade with a relatively wide lower portion and a relatively narrow upper portion. A step-like transition region between the wider lower portion and the narrow upper portion. The key blade includes a longitudinal profile groove located adjacent to the step-like transition region that extends along at least a portion of the length of the blade. An inner wall of groove is substantially parallel to a side surface of the lower portion of the key blade. The longitudinal profile groove includes an undercut portion adjacent to and inside a ridge portion of the key blade. The outside of ridge portion forms apart of the side surface of the blade in the relatively wide lower portion up to the step-like transition region and the inside of ridge portion facing inner wall of the groove.

A lock includes a housing, a cylindrical core body and a tumbler unit. The core body is rotatably mounted in the housing, and includes a core axle, and a core tube sleeved on the core axle. The core axle has a helical keyway. The tumbler unit includes a housing pin hole formed in the housing, a tube through hole formed through the core tube, a pin assembly movably mounted in the housing pin hole and the tube through hole, a hole-defining surface defining the tube through hole and having a shoulder surface portion, and a resilient member disposed in the housing and resiliently biasing the pin assembly to abut against the shoulder surface portion and extend into the helical keyway.

Locking systems allow for the unlocking and locking of, e.g., doors, containers, and enclosures. Lock cylinders are coded to specific keys, and often there is a desire to have a key be able to access a subset of lock cylinders. Keys are coded using bitting to gain access to specific lock cylinders. It is with respect to these and other general considerations that embodiments have been described.

A lock includes a housing, a cylindrical core body and a tumbler unit. The core body is rotatably mounted in the housing, and includes a core axle, and a core tube sleeved on the core axle. The core axle has a helical keyway. The tumbler unit includes a housing pin hole formed in the housing, a tube through hole formed through the core tube, a pin assembly movably mounted in the housing pin hole and the tube through hole, a hole-defining surface defining the tube through hole and having a shoulder surface portion, and a resilient member disposed in the housing and resiliently biasing the pin assembly to abut against the shoulder surface portion and extend into the helical keyway.

A cylinder lock unit includes a housing having an upper part and a lower part that includes a cylindrical bore accommodating a rotatable key plug. A back region of the key plug has a minimum length of 50% of a total length of the key plug with an adjoining front region having a maximum length of 50% of the total length. The front region accommodates at least one side locking mechanism confined entirely within the front region of the key plug that includes a longitudinal row of at least two coded side locking tumblers each interacting with the lower part of the housing wherein each side locking mechanism is movable independently of each other with at least three different code positions for each coded side locking tumbler and a plurality of different code combinations for the at least two coded side locking tumblers in each of the longitudinal row.

The invention relates to a key (1) for locking a cylinder lock, comprising at least one first surface (2) and at least one second surface (2), with sensing positions (4) provided along the longitudinal extent of the key (1), wherein at least one code (3) is provided on the first surface (2) and wherein at least one further code (3) is provided on the second surface (2), the codes comprising control points (6, 6, 7, 7) at the sensing positions (4) that are provided transversely to the longitudinal extent of the key (1) and arranged at certain control heights (5), wherein at least at one sensing position (4) at least one control point (25, 25) has a different dimension, preferably a larger diameter, on the two surfaces than a control point (6, 6, 7, 7) at another sensing position (4). The invention also relates to a lock for such a key and a system made up of at least two locks and at least one key.

A lock for pick prevention includes a set of cylinder pins aligned in a row in a cylinder. A first set of security pins are in a first carriage assembly. The security pins are aligned to a keyed displacement in cooperation with the set of cylinder pins. A second carriage assembly is positioned angularly displaced from the position of the first carriage assembly. One of the second set of security pins is aligned to the same keyed displacement as a corresponding one of the first set of security pins. An obstructive device is coupled to the second set of security pins, which is disposed to obstruct the cylinder from reaching an unlocked position in the event, a displacement of the second set of security pins does not align with the same keyed displacement as the first set of security pins.

Cylindrical locks and more specifically a set of profile members in combination with a rotatable cylindrical key plug have a longitudinal keyway with a profile corresponding to an associated key. Each profile member is accommodated in an associated cavity in the key plug at a lateral side of the keyway so as to form a lateral part thereof. The profile members have a non-circular cross-section and are non-rotatably mounted in the associated cavities at a location adjacent to the keyway. A portion of each profile member has a profiled surface portion facing inwards toward the opposite lateral side of the keyway, the profiled surface portion having, in a plane being transversal to a longitudinal axis of the key plug, a specific profile section defining a local, lateral part of the keyway. An associated key, and a method to manufacture a cylindrical key plug with such profile members are also disclosed.

A plug assembly including a plug, a sidebar movably mounted on the plug, and a plurality of rack pins seated in the plug. The sidebar is biased to an outer position in which the sidebar extends beyond an outer surface of the plug. Each rack pin is a single-piece unitary structure including a key-following leg and a sidebar-engaging leg. The sidebar-engaging leg includes at least one true gate and a plurality of false gates. When a true gate of each rack pin is aligned with the sidebar, the sidebar is free to move radially inward to an inner position.