Cylinder lock and key system
AssigneeAssa Abloy Opening Solutions Sweden AB
InventorDaniel Andersson
Life of this patent
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Abstract
A cylinder lock and key system. The plugs comprise a housing having a cylindrical bore; and a cylindrical plug which is rotatable and which exhibits a front end and a keyway. The keys comprise a key bow; and a key blade is rotatable about the rotational axis when inserted. The plugs and keys are provided with cooperating stop surfaces for defining the fully inserted position of the keys. At least one first stop surface is in contact with a corresponding second stop surface when a key is inserted in the keyway of a lock. At least two first stop surfaces of each key are arranged adjacent each other and at least two second stop surfaces of each lock are arranged adjacent each other, at or in proximity to the keyway. A cylinder lock and key combination, a key, a key blank and a cylinder lock are also disclosed.
Claims20
A cylinder lock and key system including,
- cylinder locks of the kind comprising
- a housing having a cylindrical bore;
- and
- a cylindrical plug which is rotatably journaled in the housing about a rotational axis and which exhibits a front end and a keyway which extends axially from an entrance opening at the front end;
- and
- keys of the kind comprising
- a key bow;
- and
- a key blade which is insertable in a forward direction to a fully inserted position in the keyway of corresponding locks and rotatable about the rotational axis when inserted;
- wherein the keys are provided with a code and the plugs are provided with code sensing members for detecting the code of an inserted key;
- wherein the plugs and keys are provided with cooperating stop surfaces for defining the fully inserted position of the keys in the keyways, which cooperating stop surfaces comprise
- at least two first stop surfaces arranged at each key, each first stop surface facing forward in the insertion direction and being positioned at a selected one of a predetermined number of selectable axial positions (a, b), and
- at least two second stop surfaces arranged at the front end of each plug, each second stop surface facing forward relative to the plug and being positioned at a selected one of the predetermined number of selectable axial positions (A, B);
- and
- wherein the first and second stop surfaces are arranged such that at least one first stop surface is in contact with a corresponding second stop surface when a correct key is fully inserted in the keyway of a corresponding lock,
- the code exhibits a code cut angle α and code surfaces which are radially separated by an integer multiple of a code surface pitch, p, and in that
- the selectable axial positions for the first and second stop surfaces are axially separated by a stop separation distance x, wherein x≥0.5*p*tan α.
A cylinder lock and key combination including,
- a cylinder lock comprising
- a housing having a cylindrical bore;
- and
- a cylindrical plug which is rotatably journaled in the housing about a rotational axis and which exhibits a front end and a keyway which extends axially from an entrance opening at the front end;
- and
- a key comprising
- a key bow;
- and
- a key blade which is insertable in a forward direction to a fully inserted position in the keyway of corresponding locks and rotatable about the rotational axis when inserted;
- wherein the key is provided with a code and the plug is provided with code sensing members for detecting the code of the inserted key;
- wherein the plug and key are provided with cooperating stop surfaces for defining the fully inserted position of the key in the keyway, which cooperating stop surfaces comprise
- at least two first stop surfaces arranged at the key, each first stop surface facing forward in the insertion direction;
- and
- at least two second stop surfaces arranged at the front end of the plug, each second stop surface facing forward relative to the plug;
- and
- wherein the first and second stop surfaces are arranged such that at least one first stop surface is in contact with a corresponding second stop surface when the key is fully inserted in the keyway of the lock,
- the code exhibits a code cut angle α and code surfaces which are radially separated by an integer multiple of a code surface pitch, p, and in that
- the selectable axial positions for the first and second stop surfaces are axially separated by a stop separation distance x, wherein x≥0.5*p*tan α.
Dependencies are inferred from the claim text.