Method and device for supervising and giving a progressive alarm in response to detected intensity

Claim 1

In a supervising and alarm device comprising a means for detecting vibrations undergone by closing means of exits or openings of premises to be supervised, a means for assigning to said vibrations at least two levels respectively corresponding to at least two intensities of vibrations and a means for producing a general alarm signal in response to the highest intensity of vibrations; the improvement comprising a means for producing a warning and dissuasion signal for a predetermined period of time in response to vibrations corresponding at least to the lowest level of intensity, said signal being intended for the person who had caused said vibrations and produced at the exit or opening location where said vibrations have been produced; wherein said means for detecting vibrations are detectors which are operative under the action in inertia and are each associated with the respective closing means of an exit or opening, said means assigning levels to the vibrations comprising analyzers, each of which analyzers is connected to a respective one of said detectors; said device further comprising: timing circuits which are respectively connected to said analyzers for determining the period during which said general alarm signal and/or warning and dissuasion signals are produced as a function of the level of the detected vibrations; and wherein exits or openings to be supervised are provided with said detectors which are operative under the action of inertia and are combined with magnetic contacts in such manner that wire loops which interconnect them are permanently closed when its corresponding exit or opening is closed and are intermittently opened when its corresponding exit or opening is subjected to vibrations or are permanently opened when the exit or opening is opened, each loop comprising a filtering circuit for passing information signals which correspond to mechanical vibrations detected by the detector and for eliminating noise signals of an electromagnetic or electric origin induced on said wire loop, said filtering circuits including shaping circuits for shaping said passed signals; and wherein each shaping circuit is connected to a memory means for storing an information signal coming from the corresponding detector, said memory means including means for cyclically resetting themselves so as to solely store said information signal corresponding to the signals which are being processed in the analyzers, said memory means also authorizing the corresponding means for producing a warning and dissuasion signal.