Patent ID: 7874190

Claim:
An electromechanical lock cylinder that cooperates with evaluation electronics to recognize access authorization, comprising: two opposite cylindrical receptacles, at least one of which comprises either a lock core, capable of being operated by a key, or a knob shaft, which is connected to rotate in unison with a knob, wherein the lock core or knob shaft cooperates with a lock tab, which operates, in particular, a bolt or a latch of a door lock, and, with a fitting key or access authorization, an electromechanically driven blocking or coupling element is moved from a rest position to an operating position and produces a splined connection between the key or knob and the lock tab, whereas the lock tab, in the rest position of the blocking or coupling element, is freely rotatable relative to the lock core or the knob shaft, wherein the blocking or coupling element is arranged on or in the lock core or on or in the knob shaft and rotates with it, and includes an eccentric that is rotatable between a first and second position such that when the eccentric is in the first position, a driver in communication therewith is in a rest position, and when the eccentric is rotated from the first position to the second position, the driver is moved in a direction radially outwardly and substantially perpendicular to a long axis of the knob shaft or lock core into an operating position, in which the driver engages in a recess of the lock tab or a rotary sleeve, on which the lock tab is arranged.