Patent ID: 6155090
Filing Date: 2000-12-05
Classification: E05B,Y10T

Abstract:
A cylinder lock comprising:a) a lock cylinder (4) having a bore forb) rotatably accommodating a plug (7), said plug including a peripheral surface and a front end portion which defines an outer end surface (7b');c) a key slot (8, 9) in the plug for insertion of a key blade having a profile adapted to a profile of the key slot;d) at least one row of pin channels (12) in the plug for accommodating pin tumblers (13) co-acting with the key blade;e) a profiled element (5; 5') mounted at the font end portion of the plug (7) and provided with a key hole (6; 6') having a profile which deviates partially from the profile of the plug key-slot, so that only certain keys that are insertable into the plug key-slot can be inserted into the key hole (6) of the profiled element (5); andf) attachment members (5b; 7c) for releasably attaching the profiled element to the plug (7), said attachment members being inaccessible from outside the lock when the plug is inserted to a use position in said bore, said attachment members having an engagement surface (5b') which extends perpendicular to a plug axis and which is located closer to the front end portion of the plug than the first pin channel (12) in said row, and which engagement surface (5b') is operative for co-action with a corresponding engagement surface (7c') on said plug such as to anchor the profiled element (5) reliably to the plug (7) when the profiled element (5) is in an applied position;g) said engagement surfaces (5b'; 7c') of said attachment members extending beyond at least one end of the key hole (6) and the key slot (8, 9), respectively, without reaching the peripheral surface of the plug located radially outside said end of said key slot, and enabling the profiled element (5) to be fitted perpendicularly to the plug axis when the plug is at least partially removed from the bore in the lock cylinder (4), wherein an outer surface (5a) of the profiled element (5), which is formed of a hard material relative to a material from which the plug is formed, in the applied position of the profiled element, completely covers the outer end surface (7b') of the plug, and wherein said cooperating engagement surfaces (5b'; 7c') of said attachment members are spaced apart from a rear side of the profiled element so as to be situated at an axial distance from the rear side of the profiled element, the rear side lying close to the outer end surface (7b') of the plug.