Locking device with a cylinder lock and a flat key

A locking device having a cylinder lock and a flat key, wherein the cylinder lock comprises a rotor rotatable in a stator with a key channel having a pair of channel broad sides, the rotor further having guides with at least two tumblers approximately at right angles to a longitudinal axis of the rotor and parallel to the pair of channel broad sides, each of the at least two tumblers being provided with a carrier arranged to project into the key channel and the flat key comprises a pair of key broad sides having guide tracks, such that when the flat key is inserted into the key channel, the guide tracks engage the at least two carriers, the locking device comprising:

• a rear side of each tumbler facing away from the key channel;
• a positioning faces on each tumbler rear side, each positioning face having at least two codings, one of the codings being an unlock coding;
• a number of second blocking elements corresponding to the number of tumblers, each second blocking element disposed between the stator and the rear side of one of the tumblers, each second blocking element comprising:
• a first part movably supported in a bore in the stator;
• a second part movably supported in a bore in the rotor, aligned on a blocking element longitudinal axis with the first part and having a dividing face in slidable contact with an end face of the first part;
• a blocking element end of the second part contacting the codings on the adjacent positioning face;
• such that when the blocking element end of each second blocking element is positioned contacting the unlock coding on the positioning face of the corresponding tumbler, the dividing face and end face of each second blocking element coincide with a shear line between the stator and rotor permitting rotation of the rotor.