DOOR RIM LOCK Russian patent published in 1999 - IPC

FIELD: locking devices. SUBSTANCE: door rim lock has body which accommodates longitudinally movable spring-biased latch. Also provided are oblique teeth, cover, and pressure key with row of coding recesses for interaction with oblique teeth of latch and with additional row of coding recesses for release of lock. Lock is provided with second subsequently operating latch and cylindrical locking mechanism which is located in lock body coaxially with key hole for pressure key at opposite side of latches which interacts with additional row of coding recesses in key. It displaces latch by means of pin installed in it and lug on cylindrical locking mechanism interacting with spring-biased strip. This strip keeps latch in closed position by means of slot. Oblique teeth are located in first latch in lateral slot which at one side interact with stop which is secured on second latch. Made in other side of slot is recess intended for turning of key rod. Strip is provided with lifting handle. Second latch has pin which is located in body slot. Pin can be longitudinally displaced for fixing latches at manual unblocking and this feature adds secrecy to lock. EFFECT: higher efficiency. 3 dwg