Abstract: The rotary locking cylinder has a housing with a longitudinal bore hole in which a rotor is inserted. In the lower region of the bore hole, a groove-shaped recess is worked into the housing, a blocking insert being inserted into this recess. This blocking insert projects into the key groove and prevents the rotor from being turned by force so as to shear off the tumbler pins. When employing unauthorized opening methods, the blocking insert must be held against the repelling force of spring elements in an inactive position, which substantially impedes such unauthorized methods or even renders them impossible.

Abstract: A pickproof lock assembly has two lock sections which can be opened by a single key. The first lock section includes a key plug and a first set of tumbler members which engage radial pits provided on the key so as to disengage the key plug from the lock shell. The second lock section includes first and second movable plug halves disposed inside the lock shell and a second set of tumbler members. The key has axially extending curve protrusions on one end to move the first and second plug halves and align groove-free spaces on the surface of the first and second plug halves to form a continuous annular path. The second set of tumbler members contacts the first and second plug halves at the annular path to permit rotation of the key plug relative to the lock shell.

Abstract: A padlock and key assembly includes a padlock and a cylindrical key. The padlock includes a lock body, and a key plug which is locked in the lock body by transversely movable tumbler units and vertically movable tumbler plate units. The key includes annular grooves formed in its outer surface, and push blocks extending radially from the key. When the key is inserted into the key plug, the annular grooves engage with the tumbler pin units and the push blocks engage with the tumbler plate units so that the key plug is unlocked from the lock body, thereby enabling the key plug to rotate with the key.