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.

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.

A substantially flat key blade extends from a grip portion along a longitudinal axis and includes a connecting portion adjoining to the grip portion, a major longitudinal bitting portion provided with a row of coded cuts, and a free tip portion. The connecting portion of the key blade is provided with a first selectable abutment surface facing in the forward direction. The first abutment surface is formed as a forward end surface of a longitudinal rib portion located at a lateral side of the upper relatively narrow part of the key blade at a vertical level lying within a vertical range of the bitting portion of the key blade and extending in parallel to the longitudinal axis of the key blade and being confined longitudinally to the connecting portion of the key blade and confined also within the contour of or slightly laterally outside a rectangle of the key blank.

A lock assembly includes a plug with a keyway, primary pins aligned with the keyway, a sidebar, secondary pins adjacent the keyway, and at least one supplemental sidebar control element for controlling movement of the sidebar. A key blank has a key blade with a primary top edge to receive primary bittings for controlling the primary pins, a rib to receive secondary bittings for controlling the secondary pins, and at least one shuttle pin. The shuttle pin engages a multi-level ridge within the keyway to move the shuttle pin from a retracted position to an extended position in which an end of the shuttle pin actuates the supplemental sidebar control element.

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.

A cylinder lock with a rotating tumbler pin, a sidebar, and a slider has a keyway with a ward projection into the center of the bitting area of a key blade received by the keyway. The tip of each rotating tumbler pin seats on the bitting surfaces remaining to the sides of this center ward of the key, and the tumbler pins that are engaged by the bitting on the side of the key blade do not seat on more than half of the width of the blade. Half the pin width is removed from each tumbler pin near the tip thereof. The key has a bitted section at which one or more bittings are formed and a non-bitted section bitting that is devoid of bitting. The bittings extend at a constant depth to an edge of the key blade.

The key (1) for a lock (2), comprises at least a lever (9) having a first arm (10) for starting movement and a second arm (11) for activating a tumbler element of the lock (2), the lever (9) being pivoted to the shaft (4) of the key (1) with an oscillating axis thereof being transversal to the longitudinal axis of the shaft (4) of the key (1), the first lever arm (10) and the second lever arm (11) being located on a same face (5) of the shaft (4) of the key (1).

A lock assembly includes a plug with a keyway, primary pins aligned with the keyway for controlling rotation of the plug, a sidebar for controlling rotation of the plug, secondary pins adjacent the keyway for controlling movement of the sidebar, and at least one supplemental sidebar control element for controlling movement of the sidebar. The lock assembly is operated by simultaneously manipulating the primary pins, the secondary pins, and the supplemental sidebar control element to place each in a respective position and/or orientation to permit rotation of the plug and to permit sufficient movement of the sidebar to permit rotation of the plug and then applying torque to the plug.

A key device includes a generally elongate shaft portion that has first and second oppositely directed side surfaces, at least one of which is cuttable to form key cuts that define a key combination surface. First and second key combination elements, disposed in the elongate shaft portion, are side-by-side one another at different lateral positions along the width of the elongate shaft portion and located at overlapping longitudinal positions along the length of the elongate shaft portion. The first and second key combination elements are each pivotable about a pivot axis.