Locking system, particularly for motor vehicles and building fixtures

Locking system, particularly for motor vehicles and building fixtures, comprising a lock cylinder and a key which can be inserted into the lock cylinder and has plungers which point in the direction of insertion, wherein a locking core is rotatably seated in a housing, the core having at least one latching element which can be displaced, counter to a spring force, in the direction of insertion of the key, and which has a latching recess that can be engaged by the latch of a blocking element when the coded position of the latching element is reached, and wherein:

• the latching element comprises a carrier and a rider which can be displaced toward one another and are in frictional or form-fitting lockup, the latching recess associated with the latch is cut into the rider and a stop surface which is engaged by a stop element in an uncoded zero position of the latching element is provided at an outer free end of the rider, a spring/fixing element is provided which is supported on the one hand on an inside base surface of a base body of the locking core and, on the other hand, by the carrier, and the spring/fixing element can be brought into a fixing position in which the relative position of the carrier and the rider is fixed and the stop element is removed from its engagement with the stop surface of the rider.