DOOR INTERLOCK Russian patent published in 2000 - IPC

FIELD: locking devices. SUBSTANCE: proposed door interlock can be used together with traditional door locks forming additional barrier against unauthorized opening of door. Door interlock gives possibility of partial opening of door with interlocking of further opening of door. It is installed on door and door frame inside room with possibility of its usage both inside room and outside of it. Door interlock includes lock and members to interlock opening of door with provision of access with key to lock of interlock from outside through clearance between partially opened door and door frame with door being interlocked. If door is open members interlocking opening of door are piled up against each other by means of spring and door member automatically locked in hole of lock body when door is being closed is arranged at right angle with regard to them. Fastening bolt placed in hole of lock body and is inaccessible after locking of member in hole of lock body. EFFECT: increased functional reliability and convenient handling of door interlock. 3 dwg