Abstract: The invention concerns a lock cylinder with a lock cylinder housing, having at least one hollow cylindrical receptacle, in which a rotating part is mounted to rotate, which is connected to rotate in unison with a lock element, and with at least one coupling device, which moves at least one blocking element between a locked position, in which it is engaged with an abutment in the rotating part or the lock cylinder housing and blocks rotation between the rotating part and blocking cylinder housing, and a released position, in which it is disengaged from the abutment and permits rotation between the rotating part and the lock cylinder housing. According to the invention, it is proposed that along the peripheral region of the rotating part of the lock cylinder housing, which is swept by the blocking element during one revolution of the rotated part, at least two and preferably several abutments are provided in the peripheral direction, into which the blocking element can engage.

Abstract: The invention concerns a lock cylinder with a lock cylinder housing, in which a knob shaft, rotatable by means of a knob, is mounted to rotate on one side or both sides, and with at least one electromechanically operating coupling device, which, based on an authorization signal, connects a lock element to rotate in unison with the knob shaft and/or releases the knob shaft, in order to operate a lock, said authorization signal being generated by an evaluation electronics based on an input or input signal.

Abstract: The invention relates to an electromechanical lock cylinder, which interacts with evaluating electronics for recognizing an access authorization and comprises a housing that has two opposing cylindrical cavities (12). A lock core, which can be actuated by a key, or a knob shaft (11), which is joined to a knob in a rotationally fixed manner, is rotationally mounted in said cavities. The lock core and/or knob shaft (11) interact with a lock lug (13), which actuates, in particular, a bolt or latch of a door lock. When the key fits or in the event of a successful access authorization, an electromechanically driven blocking or coupling element (14) is moved out of the position of rest into an angular position, and a rotationally fixed joining between the key or knob and the lock lug (13) is effected. The invention is characterized in that the lock lug (13), when the blocking or coupling element (14) is in a position of rest, can be freely rotated relative to both lock cores or to both knob shafts (11).