| 摘要 |
The invention relates directly to the improvement of protective means (locking devices and mechanisms) of residential, commerce, social and other premises and safe boxes for maximally reducing the possibility of penetration of unauthorised persons into a room or a safe box. The inventive method for protecting a locking device consists is mounting mechanical, laser, infrared movement-sensitive and other means in front of a locking device or thereinside and in connecting said means to alarm means. The inventive means for protecting a locking device is embodied in the form of a mechanical, laser, infrared movement-sensitive and other curtain which is connected to an alarm electric circuit. Said mechanical curtain can be embodied in the form of a protective plate provided with a magnetic or contact sensor which is connected to the alarm electric circuit. The laser curtain can be embodied in the form of a unit which consists of a light source and a light sensor and is connected to the alarm electric circuit. The infrared movement-sensitive curtain can be embodied in the form of an infrared ray sensor connected to the alarm electric circuit.
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