THREE-LINK LOCKING DEVICE Russian patent published in 2021 - IPC E05B27/00 

FIELD: locks.

SUBSTANCE: invention is a three-link lock device used as a central and end overlay lock, locking from outside the movement of the lock locking plate only from the closed position. Disclosed is a three-link locking device consisting of a fixed platform, fixed on the door inner side, on which there is a locking plate and its displacement mechanism, and on which a cylindrical body is further located, in the cavity of which there is a face, consisting of three segments, adjacent to each other by adjacent planes and having coaxial channels, in which there are pushers and retainers - bodies of lever tumbler type, dropped on the key plate by a spring-loaded release cylinder, and the locking plate of this device can be locked by means of the central part of the key plate, characterized in that the tail part of the central segment of the key plate is able to engage with the locking bar through a spring-loaded trigger - a plate of a complex configuration fixed on the fixed platform in its central part, aligned with the arrangement of the cylindrical housing, in which the key plate is located, and which is able to move around the central axis, releasing forcefully from engagement with the locking plate, to shift it into the "open" from the inside position, and with outer displacement of central segment of the key plate along the central axis of the key plate provides for release of "trigger", supported by the locking plate, from engagement with tail part of the controlled segment.

EFFECT: high security, resistance to break-in, reliability and durability, wherein providing complete freedom of movement of the lock plate from inside.

1 cl, 2 dwg