FIELD: civil engineering. SUBSTANCE: door lock interlocking device is made in the form of protecting cover plate with mounted code mechanism fixed on outer side of door with capability to cover hole of main lock and alarm unit. Code mechanism has turning handle, that is kinematically linked with movable lever, end of which has turning shutter overlapping lock hole. Turning handle butt has holes with set in them spring-loaded movable stopping pins, that are mechanically linked with electrical contacts of alert unit and located in accordance with protruding pins of additional butt key. Electrical contacts are connected to decoder, power unit and executive members of alarm unit. EFFECT: increased effectiveness of door lock protection. 3 cl, 1 dwg
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