High security key operated lock, includes bolt blocking device for preventing lock picking using tumbler play

摘要

Movement of a blocking device (22) from a first position where it allows the bolt to move freely between its extended and retracted states, to a second position where it prevents the bolt from moving from its extended state to its retracted state, is actuated when an interaction between a sharing tumbler (15, 21) and the pin tumblers detects an incorrect key code.