Abstract: A lock includes a lock housing (3), a bolt (20) which is moveable in the lock housing between an inwardly withdrawn and an outwardly extended position and which includes a weakened region (36). The lock also includes a blocking element (5) fixedly arranged in the lock housing, an interlocking device (12, 14, 16), and a bolt-carried abutment element (34) which is adapted to coact with the interlocking device (16). When the bolt is subjected to an outer force that exceeds a generally predetermined force, the bolt will deform in the weakened region (36) so that movement of the bolt between the outwardly extended and inwardly withdrawn positions will be blocked by the fixedly mounted blocking element (5).

Abstract: The present invention relates to a lever tumbler lock in which the scrape marks caused by the key bit as it displaces the various tumblers will not be completely informative of the configuration of the key bit.According to the invention the lock includes a device which as a key bit (13) inserted into the lock housing (1) is turned will scrape against at least a part of the cam surface (10) of at least one tumbler (2) such as to create on this cam surface or those cam surfaces scrape marks which cover the scrape marks caused by corresponding cams on the key bit when the key is turned, at least at the beginning and the end of these scrape marks.