Patent ID: 6508091
Filing Date: 2003-01-21
Classification: E05B,Y10T

Abstract:
A cylinder lock and a key insertable therein, the lock comprising: a body; a cylindrical seat formed in said body and having a notch; a plug which can rotate in said seat, an actuation bit which is rotationally rigidly coupled to said plug; a keyway which is formed axially in said plug, comprising at least one hole which is formed in said plug and intersects said keyway, said hole being provided with two shoulders, of which one lies further outward and the other one lies further inward with respect to a surface of the plug; at least one auxiliary tumbler accommodated in said plug hole and comprising an auxiliary pin; an auxiliary complementary pin; a spring arranged so as to act by expansion between said auxiliary and complementary pins and so as to allow said tumbler to assume any of an elongated configuration, wherein said pin and said complementary pin are spaced from each other and axially offset angularly with respect to each other, and a shortened configuration, in which said pin and said complementary pin are aligned in mutual abutment without being axially offset and wherein, said tumbler, in a configuration with any of the key removed and with a forged key with a removed portion inserted, being adapted to assume said elongated configuration in which said auxiliary pin is kept rested against said inward shoulder and said auxiliary complementary pin is kept at such a level as to allow angular strokes with respect to said auxiliary pin and the engagement of said complementary pin on said outward shoulder, while an end of said complementary pin remains engaged in the notch of said cylindrical seat; and wherein said key is provided with an elastic element adapted to cooperate with said auxiliary tumbler in order to allow, with the key inserted, compression of said auxiliary tumbler in the shortened configuration and disengagement of said tumbler from said notch and the consequent rotation of said plug.