Key for a lock cylinder
AssigneeDOM-Sicherheitstechnik GmbH & Co. KG
InventorsHerbert P. Hauser, Alexander Stefanescu
Life of this patent
Estimating the term…
Abstract
For increased security the key (2; 40; 44) has one or more blade portions (43; 45; 46; 5, 6). The longitudinal central plane (A, B) of the or each blade portion is offset from the guide region (42; 7) running along the back edge of the key shaft (3). Furthermore, the or each blade portion is connected to the guide region by means of a bridging portion (14, 14') which forms an obtuse angle (alpha) with the guide region, as well as forming an obtuse angle with the blade portion. In one preferred embodiment two blade portions (45, 46; 5, 6) are provided; they may be of the same cross-sectional shape (FIG. 2) or symmetrical (FIG. 11). The blade portions and guide region may be divided into two portions to provide partner keys (FIG. 12).
Claims22
Key for a cylinder lock comprising a guide region extending along a back edge portion of the key for guiding the key along a keyway of the cylinder, and at least one blade portion having a narrow edge opposite the guide region, in which edge V-cuts are formed for operating tumbler pins of the cylinder, said blade portion also having formed in one side surface thereof at least one longitudinal rib portion flanked at each side by a longitudinal groove, wherein each blade portion is connected to the guide region by a bridging portion and the longitudinal central plane of each blade portion is offset from that of the guide region such that the side surface of the guide region facing said plane forms an obtuse angle with the bridging portion, and further wherein an extension of the plane of the side surface of the guide region passes through the peak region of the rib portion formed in the side surface of the blade portion.
Dependencies are inferred from the claim text.