DISPOSITIVO DI CHIUSURA PER SERRAMI DI PORTE DI VEICOLI A MOTORE.

摘要

A tubular lock housing receives a core plug which is rotatable in the housing about an axis between a pair of angularly offset unlock and antitheft positions and through an intermediate lock position. Pluralities of first and second tumblers are exposed at the key-receiving passage of the plug and are diametrally displaceable therein between outer positions lying radially within the outer surface of the core. Differently bitted first and second keys are engageable in the key-receiving passage with the respective tumblers to displace them into the inner positions. At least one inwardly open first recess is formed in the inner wall of the tubular lock housing in radial alignment with the first tumblers only in one end position of the plug, so that these tumblers engage in the first recess when in the outer positions and thereby prevent angular displacement of the plug from the unlocked position. At least one inwardly open second recess is also formed in the inner wall of the lock housing in radial alignment with the second tumblers only in and between this one end position and an intermediate position of the plug. Thus the plug can be moved between the one end position and intermediate position by the first key, but can only be moved into the other end position by the second key.