LEVER TUMBLER MECHANISM Russian patent published in 2019 - IPC E05B25/00 

FIELD: locks.

SUBSTANCE: invention relates to elements of locking devices, namely, to lever tumbler mechanism with swinging lever tumblers, and can be used in development of locks, which are required by high resistance to criminal opening, including carried out using optical fiber systems such as endoscopes or borescopes. Lever tumbler mechanism includes key with barb installed on appropriate axis of rotation and plate-like swinging lever tumblers. Bit of key has stepped profile formed by set of secrets – profile steps, height values of which are located in range from h_min to h_max. Lever tumblers are installed in the form of a package on its axis of rotation with the possibility of independent angular movement under the action of the key, as well as possibility of maintaining the achieved angular position lever tumblers when key is released from interaction with them and possibility of forced installation lever tumblers into initial position. Working beads profile lever tumblers, with which key secrets interact, is identical for all lever tumblers and has initial angular edge, with which key barb side surfaces interact, and end section in form of arc with radius greater than h_max. This section is located so that when interacting with it secret key h_min said arc touches a circle with radius h_min and centre on axis of rotation of key in point, which lies on a straight line, which is simultaneously tangent to said circle and circle with diameter d and centre on axis of rotation lever tumblers, and when interacting with it secret key h_max this arc touches a circle with radius h_max and centre on axis of rotation of key in point, which lies on another straight line, which is simultaneously tangent to a given circumference and a circle with diameter d and centre on the axis of rotation lever tumblers, where d satisfies the condition d=h_min+ h_max.

EFFECT: providing approximate equality of traces left by key secrets on working beads lever tumblers, which eliminates the possibility of detecting key code on these tracks.

1 cl, 4 dwg