CYLINDRICAL LOCK WITH ANTI-BURGLARY DEVICE Russian patent published in 2004 - IPC

FIELD: locksmith's work. SUBSTANCE: the lock has a body, cylindrical seat formed in the body, cylinder capable of rotating in the seat, drive plate rigidly connected for rotating in the seat, drive plate rigidly connected for rotation with the cylinder, duct for the key formed in the cylinder in the axial direction. The lock has at least one hole formed in the cylinder intersecting the duct for the key and having two bulges, one of which is positioned further outside, and the other is positioned inside relative to the cylinder surface, at least one auxiliary pin located in the hole and containing an auxiliary finger, additional auxiliary finger and a spring acting by means of expansion between the auxiliary finger and the additional finger so as to provide a possibility for the finger to take an elongated configuration, at which the finger and the additional finger are distant from each other are capable of shifting in the axial direction at an angle relative to each other, the end of the additional finger remains engaged in the recess of the cylindrical seat, the key is provided with a flexible member designed for engagement with the auxiliary pin. EFFECT: enhanced resistance to burglary. 7 cl, 9 dwg