DOOR LOCK Russian patent published in 1999 - IPC

FIELD: locking devices. SUBSTANCE: door lock has body incorporating span-piece strip with post and span-pieces, movable cylinders which are spring-biased relative to lock body with rack slots. Movable cylinders are installed on posts of span-piece strip with ensuring possibility of fixing them in position and of displacing them under rotation of key. Lock is provided with bush installed on body for creation of support for key. Bush is located in body of lock under span-pieces for internal closing. Also provided is actuated spring-biased latch which is adapted for blocking key hole. Provided for this purpose is gate so as to prevent insertion of key from both sides of lock body. Made in surfaces of movable cylinders are radial bulges aimed at stabilization of thickness dimension of movable cylinders. Thickness dimension is equal to pitch of key thread and this reduces force of friction between them. Depth of slots in movable cylinders is variable along their length for higher secrecy. Posts are made of various length and are stepped in shape. Movable cylinders are installed so as to ensure their 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