LOCK Russian patent published in 1998 - IPC

FIELD: locking devices. SUBSTANCE: lock is installed on door of premise to be guarded and has highly reliable interlocking system. Design of lock excludes possibility of selecting proper key or damaging of key hole. Lock has body, span-piece, span-piece control member, control circuit with member connected with span-piece, detent and detent control means. Span-piece control member is presented by shaft. One end of shaft is located externally on door, other end of shaft by means of control circuit can interact with span-piece for its displacement. Detent and detent control means are installed so as to ensure interaction of detent with control circuit member or span-piece for fixing of span-piece when lock is in closed position. Located between shaft and member which is in position for interaction with detent is at least one friction pair or part of friction pairs incorporated in control circuit. EFFECT: higher efficiency. 8 cl, 4 dwg