Abstract: A key blade having a longitudinal axis (A) of insertion and comprising an elongated, wave-like generally longitudinally extending code pattern (38) for cooperation with a row (23) of elevationally and rotationally movable locking tumblers (23a-23e) of a rotary cylinder type lock (18). Each of the locking tumblers is provided with a transversely projecting finger which engages with the code pattern (38) when the key blade is inserted into the lock. The code pattern (38) includes a number of concavity locations (40-44) which are displaced longitudinally and transversely so as to correspond to specific rotational and elevational positions of the locking tumblers which will permit releasing of the lock.

Abstract: A rotary cylinder lock and a corresponding key blade are disclosed. The cylinder lock comprises a cylinder shell (19), a key plug (20) rotationally mounted in the shell (19) to provide a shear line (21) between the shell and the key plug, a key slot (11) extending into the key plug (20) parallel to the rotational axis thereof for receiving a key blade (1), at least one locking tumbler (23b) including an elongated body portion guided in a complementary cavity (33b) in the key plug (20), the elongated body portion being capable of rotational movement about its longitudinal axis, and a fence member blockingly associated with the locking tumbler and shaped so that rotational positioning of said locking tumbler with a properly shaped key blade allows said fence member to clear the shear line.