KEYHOLE OF THE LOCK Russian patent published in 2021 - IPC E05B17/18 

FIELD: finish hardware.

SUBSTANCE: invention relates to hardware products, namely to locks with an unauthorized access alarm. The keyhole of the lock contains a housing (1) and a cover in which holes are made in the form of wells for the passage of the key (6), and at least one spring-loaded movable curtain (4) installed in the housing, blocking the well for the passage of the key (6). Electrical contacts (5) of the unauthorized access detector are located in the housing (1). At least one curtain (4), when moving the key (6), has the ability to interact with the contacts (5) to close or open them.

EFFECT: increased reliability of protection against unauthorized access to the room and probing the lock code is provided.

1 cl, 4 dwg