Patent ID: 8261588

Claim:
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 ).