DOOR LOCK Russian patent published in 1999 - IPC

FIELD: locking devices. SUBSTANCE: door lock has following components located in its body; span-piece strip with posts and span-pieces, movable cylinders which are spring-biased relative to body with rack slots. Movable cylinders are installed on posts of span-piece strip with possibility of fixing in position of movement under rotation of key. Also provided are following components: bush installed on body for creation of support for key, two stepped and smooth tie-rods with latches which are located opposite to each other on side surfaces of body. They can be displaced longitudinally due to action of span-piece strip in direction which is perpendicular to displacement of span-pieces for locking of door in upper and lower points of door opening. Made in surface of movable cylinders are radius bulges so as to ensure stabilization of thickness size of movable cylinders which is equal to pitch of key thread, and also for reducing force of friction between them. Depth of slots in movable cylinders is made variable over their length for higher secrecy. Movable cylinders are installed for possible displacement on posts in perpendicular direction relative to span-pieces at distance equal to larger depth of slot. Aforesaid embodiment of door lock provides for higher operational efficiency. EFFECT: higher efficiency. 2 cl, 2 dwg