Patent ID: 8695390

Claim:
A cylinder lock of the type of a wafer tumbler cylinder, having a cylinder housing and a cylinder core rotatable therein, wherein a plurality of wafer tumblers are provided in the cylinder core which have at least one respective engagement section, with the wafer tumblers being movable between an unlatched position and a latched position and being biased along a respective direction of bias into the latched position, with the respective engagement section engaging in the latched position into an associated cut-out in the cylinder housing to block the cylinder core against a rotary movement relative to the cylinder housing, and with the cylinder core being rotatable relative to the cylinder housing in a rotary opening direction when the wafer tumblers are in the unlatched position, wherein at least one of the wafer tumblers has a toothed zone which can be brought into engagement with a counter-toothed zone of the cylinder lock such that said at least one wafer tumbler is blocked against a movement opposite to the respective direction of bias when said at least one wafer tumbler is in the latched position and a torque is exerted onto the cylinder core in the rotary opening direction, wherein the toothed zone of the at least one wafer tumbler and the counter-toothed zone of the cylinder lock abut within and radially inwardly spaced from the outer periphery of the cylinder core, wherein said at least one wafer tumbler has a further engagement section which is disposed opposite the respective engagement section with respect to the respective direction of bias, wherein said at least one wafer tumbler blocks the cylinder core against a rotary movement relative to the cylinder housing when said at least one wafer tumbler is moved opposite to the respective direction of bias in the direction of a further latched position in which the further engagement section engages into an associated further cut-out in the cylinder housing, wherein said at least one wafer tumbler has a further toothed zone which can be brought into engagement with the counter-toothed zone of the cylinder lock such that said at least one wafer tumbler is blocked against a movement along the respective direction of bias when said at least one wafer tumbler is in the further latched position and a torque is exerted onto the cylinder core in the rotary opening direction, wherein also the further toothed zone of said at least one wafer tumbler and the counter-toothed zone of the cylinder lock abut within and radially inwardly spaced from the outer periphery of the cylinder core, wherein the toothed zone of the at least one wafer tumbler and the counter-toothed zone of the cylinder lock mesh such that a torque exerted onto the cylinder core against the rotary opening direction moves said at least one wafer tumbler and the counter-toothed zone of the cylinder lock out of mesh with each other.