Key or key blank for a disk cylinder and associated disk cylinder

#The present invention relates to a key or to a key blank for a lock cylinder of the type of a disk cylinder. Such a key blank is provided to produce a key for a disk cylinder by applying a plurality of axially mutually displaced incisions—as explained in the following. The invention further relates to such a disk cylinder.

#Such a disk cylinder comprises a cylinder housing, a cylinder core that is rotatably supported about a cylinder axis in the cylinder housing and that is also called a disk housing in this context, and at least one blocking pin that is provided at the outer periphery of the disk housing, that is aligned in parallel with the cylinder axis and is displaceable radially to the cylinder axis, and that blocks the disk housing against a rotational movement in a radially outer blocking position and release the disk housing for a rotational movement in a radially inner release position. Such a disk cylinder furthermore comprises a plurality of disk tumblers arranged along the cylinder axis in the disk housing and rotatably supported between a locked position and an unlocked position, wherein each disk tumbler has a key reception opening and has at least one blocking cut-out at the outer periphery in which the blocking pin can be at least partly received in the release position. The blocking pin can only be displaced into the release position when all the disk tumblers are in their unlocked position in which the blocking cut-out of the respective disk tumbler is aligned radially to the blocking pin.

#Such a disk cylinder is known from DE 10 2011 015 314 A1 and from EP 0 712 979 B1.

#The invention will be described in the following by way of example with reference to the drawings, in which the same or similar elements are characterized by the same reference numerals.

#FIG. 1 shows a longitudinal section of a disk cylinder with a key;

#FIG. 2 shows an exploded view of parts of the disk cylinder with a key in accordance with FIG. 1;

#FIG. 3 shows a cross-section 50 of the key shaft 25 of a key 24 for a disk cylinder 10 in accordance with FIGS. 1 and 2 and a cross-section 50 of a key blank 24′ that serves for the manufacture of a key 24, wherein the shaft cross-section 50 in accordance with FIG. 3 differs from the shaft cross-section of a key 24 in accordance with FIGS. 1 and 2, as will be explained in the following. The view in accordance with FIG. 3 is selected such that the key 24 is rotated clockwise for an opening actuation of the associated disk cylinder.

#The shaft cross-section 50 in the embodiment shown here is point-symmetric and has a first end section 51, a second end section 52, and a connection section 60 along a longitudinal axis L (extending within the shown section plane), said connection section connecting the first end section 51 and the second section 52 to one another. The first end section 51, the second end section 52 and the connection section 60 extend in each case along approximately a third of the length of the shaft cross-section 50 with respect to the longitudinal axis L in the embodiment shown in FIG. 3.

#The first end section 51 and the second end section 52 form, in extension of the obliquely extending connection section 60, a respective encoding region 54 for driving an associated disk tumbler 16 (FIGS. 1 and 2), with a respective outer edge 55 of the end section 51, 52 partly bounding the respective encoding region 54 and being able to be set back, however, partly or completely by an incision 26 (FIGS. 1 and 2), as is shown in FIGS. 4 and 5. The shaft cross-section 50 in accordance with FIG. 3, however, has no incision and thus corresponds to an encoding “6” or to a key blank without incisions.