METHOD TO PROTECT LEVER LOCK FROM UNAUTHORISED OPENING AND LEVER LOCK FOR ITS REALISATION Russian patent published in 2013 - IPC E05B15/00 

FIELD: construction.

SUBSTANCE: when a key in a lock is rotated and sets the code plates - levers in the required position, the key directly interacts with a driving plank 8, putting it and a plate 7 in action (motion). At the same time in the initial stage of making the first half-turn with the key in the lock, the opening of the keyhole is blocked, excluding the part of the space required for placement and free rotation of the key in the lock. At the same time removal of a protective curtain interacting with the crossbar frame is raised above the level of the protruding part of the crossbar frame, and then at the minimum movement of the crossbar with the key is placed onto its protruding part, thus providing for retention of the protective curtain in the position required for retention of the larger part of the opening in the "closed" position, until making the full closing-opening of the lock. Unblocking of the keyhole at the same time happens in the final stage of making the first-last half-turn of the lock. Since the blocking of the larger part of the keyhole takes place in the initial stage of performance of the first half-turn (180°), and unblocking - in the final stage of making the last half-turn, which stops the possibility to decode the code combination already in the first half-turn.

EFFECT: increased reliability of lever lock protection against its unauthorised opening with simultaneous simplification of its working drive.

6 cl, 9 dwg