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 includes a key-following leg and a sidebar-engaging leg. The sidebar-engaging leg includes at least one true gate. 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.

A substantially flat key blade extends from a grip portion and has a connecting portion, a major longitudinal bitting portion and a free tip portion. The substantially flat key blade has a cross-sectional profile which, in the major longitudinal bitting portion, is confined within a rectangle having a height, measured in a vertical direction, being at least 2.5 times larger than a width thereof, and extends upwards in the vertical direction from a lower edge surface to an upper edge surface along a vertical mid-plane through the rectangle. A single upper part of the key blade has a relatively small lateral width being no more than 33% of the lower relatively wide part of the key blade and extends obliquely upwards at a relatively small inclinational angle in the interval 3° to 12° relative to a vertical plane.

The invention relates to a cross-sectional profile (1) for a flat key or the keyway of a cylinder lock, comprising a back surface (2), a first lateral surface (4) and a second lateral surface (4′), wherein the lateral surfaces (4, 4′) extend in the vertical direction to the back surface (2), the lateral surfaces (4, 4′) are arranged offset to one another by a distance (5), which varies along their extension, and the outline of the cross-sectional profile (1) defines a preferably substantially rectangular base profile (6), and wherein the lateral surfaces (4, 4′) each extend at least in sections along sinusoidal profiling lines (7, 7′), wherein the centerlines (8, 8′) of the profiling lines (7, 7′) lie within the base profile (6). Further, the invention relates to a flat key (16) with such a cross-sectional profile (1) and a cylinder lock with a keyway (13) for receiving such a flat key (16).

A key system of a lock having a high peaking difficulty when picking is tried by a picking tool, includes three or more rectangular holes formed between pin holes of an inner case to insert rectangular pins, where each of the rectangular pin includes a side bar insertion groove and a fake groove formed to be spaced apart from the side bar insertion groove at an interval to raise the degree of picking difficulty. A quadrangular pin is inserted into the rectangular hole located in the middle among the rectangular holes formed in the inner case to be inserted into the hole formed in an outer case. The side on which the quadrangular pin is located has an escape groove to accommodate the quadrangular pin.

The invention relates to a cross-sectional profile (1) for a flat key or the keyway of a cylinder lock, comprising a back surface (2), a first lateral surface (4) and a second lateral surface (4′), wherein the lateral surfaces (4, 4′) extend in the vertical direction to the back surface (2), the lateral surfaces (4, 4′) are arranged offset to one another by a distance (5), which varies along their extension, and the outline of the cross-sectional profile (1) defines a preferably substantially rectangular base profile (6), and wherein the lateral surfaces (4, 4′) each extend at least in sections along sinusoidal profiling lines (7, 7′), wherein the centerlines (8, 8′) of the profiling lines (7, 7′) lie within the base profile (6). Further, the invention relates to a flat key (16) with such a cross-sectional profile (1) and a cylinder lock with a keyway (13) for receiving such a flat key (16).

The invention relates to a key (1) for locking a lock, comprising at least one first surface (2) and at least one second surface (2′), with at least one sensing position (4) provided along the longitudinal extent of the key (1), at which sensing position on the first surface (2) at least one first code (3) is provided for reading in the lock and/or at least one second code (3′) is provided on the second surface (2′) for reading in the lock, wherein at least one code (3) of the first surface (2) differs at least at one sensing position (4) from the second code (3′) at the same sensing position (4). The invention furthermore relates to a lock for a key of this type, and a system made up of at least two locks or lock groups and at least one key according to the invention.

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.

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.

The disclosure relates to a cylinder lock wherein an eccentric barrel pin assembly with two contact points within the keyway are independently movable within the barrel to a common shear line against a single nested column pin assembly.

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 includes a key-following leg and a sidebar-engaging leg. The sidebar-engaging leg includes at least one true gate. 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.