Cylinder lock and key combination

Cylinder lock and key combination with a plug (1) rotatably mounted in a cavity of a cylindrical housing (4), the plug being provided with radial slots (11) arranged in series, each radial slot (11) including two tumblers (2) spring biased in the same direction and provided with side extensions (20) for engagement with a supporting spring, the side extensions (20) being oriented opposite to each other, whereby in certain slots (11) the tumblers (2) are spring biased in one direction and in other slots (11) the tumblers (2) are spring biased in another direction, whereby the tumblers are provided with cord projections (21) protruding into a key channel (10) and engaging corresponding control paths (310, 320, 330, 340) by their control edges (210), the control paths (310, 320, 330, 340) being formed along a longitudinal axis of a key (3) on its wider surfaces, characterized in that the tumblers (2) arranged in series in the odd slots (11) are spring biased in one direction and the tumblers (2) arranged in series in the even slots (11) are spring biased in the opposite direction, whereby their cord projections (21) protrude into the key channel (10) in the direction orthogonal to the sliding motion of the tumblers (2) so that the cord projections (21) are situated in each slot (11) projecting substantially towards and parallel to each other and their control edges (210) cooperate with the control paths (310, 320, 330, 340) formed on the adjacent side walls of control grooves (31,32, 33, 34;) formed in each wider surface of the key (3).