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US 12,480,334 B2Granted
Flat key for a locking cylinder
AssigneeDormakaba Austria GmbH
InventorsHeinz Navratil, Markus Kornhofer
Life of this patent
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AssigneeDormakaba Austria GmbH
InventorsHeinz Navratil, Markus Kornhofer
Estimating the term…
A flat key for a locking cylinder has substantially flat and approximately parallel flat key sides, a key rear section, and a key front section opposite thereto. The key front section has a toothing for positioning tumbler pins divided into core pins and housing pins and which are spring-loaded against the key front section in the direction of the key rear section and into corresponding bores. Grooves in the form of profiled variation elements and profiled guiding elements are provided in the flat sides of the flat key, wherein at least two grooves of one flat side of the flat key, which are preferably part of the profiled guide, overlap and are undercut in opposite directions. A depression is provided in the outer flank of at least one of the two grooves, preferably both grooves, at least one region of the depression not being visible from the side.
A flat key for a locking cylinder, in particular for locking systems, comprising substantially flat and approximately parallel flat key sides, a key rear section at a top, and a key front section at a bottom opposite the key rear section, toothed on an end face of the key front section, for positioning tumbler pins divided into core pins and housing pins, which are spring-loaded in corresponding key channels of cylinder cores against the key front section in a direction of the key rear section, wherein grooves formed as profiled variation elements and profiled guiding elements are provided in the flat sides of the flat key, wherein first and second grooves of one flat side of the flat key overlap and are undercut in opposite directions with respect to the flat side of the flat key, wherein third and fourth grooves are provided in the outer flanks of the first and second grooves, respectively, and in that at least one region of said third and fourth grooves forms a further undercut that is not visible from the side, wherein along a direction from the key rear section to the key front section, the third and fourth grooves extend further into the flat side of the flat key than the first and second grooves.
A key blank for a flat key for a locking cylinder, in particular for locking systems, comprising substantially flat and approximately parallel flat key sides, a key rear section, and a key front section, wherein grooves formed as profiled guiding elements are provided in the flat sides of the key blank, wherein first and second grooves of one side of the key blank overlap and are undercut in opposite directions, wherein a third groove is provided in the outer flank of at least one of the two grooves, and in that at least one region of said third groove is not visible from the outside along all theoretical straight lines of sight.
A method for producing a key blank for a flat key comprising substantially flat and approximately parallel flat key sides, a key rear section, and a key front section, wherein grooves formed as profiled guiding elements are provided in the flat sides of the key blank, wherein at least two grooves of one side of the key blank overlap and are undercut in opposite directions, wherein a third groove is provided in the outer flank of at least one of the two grooves, and in that at least one region of said third groove is not visible from the outside along all theoretical straight lines of sight, the method including the following steps:
Dependencies are inferred from the claim text.