UNLOCKING METHOD Russian patent published in 2014 - IPC E05B25/02 

FIELD: construction.

SUBSTANCE: method of unlocking involves a lock consisting of bar with prop anchor, lever tumblers and key with bit, where the key engages lever tumblers and brings them from original position to operational position matching the lock code, which allows prop anchor of the bar to go through respective passes in lever tumblers. Further, lever tumblers are fixated in the set operational position, and an effort is exerted on the bar via the key to shift the bar. Lever tumblers are brought and fixated in operational position in definite angle sector of key turn with mechanical blocking on bar movement, and the bar is unblocked and shifted in another angle sector with forced fixation of lever tumblers movement against each other.

EFFECT: high resistance of lock to unauthorised unlocking performed by non-destructive methods.

11 dwg