FIELD: protection and warning facilities. SUBSTANCE: device can be employed for protection of important objects by way of inclusion of warning units into network of automated system of non-departmental supervision of premises. Device has spring-loaded member and its rest. Spring-loaded mobile member comes in the form of spring-loaded plate placed with one end in key passage and rest of spring- loaded mobile member has the form of spring-loaded plate mounted for movement. Characteristic feature of invention lies in that ends of both spring-loaded plates are positioned one relative to another at angle not equal to 180 degrees. Mix of device is supplemented with magnet-controlled contact and constant magnet which are located in body of lock. Constant magnet can be moved under action of movable rest of spring- loaded mobile member. Alarm signal is generated with removal of skeleton-key or key from lock when lock was not opened either by skeleton-key or key. EFFECT: simplified design of device, raised efficiency of protection. 2 dwg
