Electronic safety device for a protection barrier
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United States of America Patent
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Mar 10, 2015
Grant Date -
Oct 9, 2014
app pub date -
Dec 28, 2012
filing date -
Dec 29, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An electronic safety device for a protection barrier includes a transponder, a transceiver device for receiving a return signal from the transponder, the transponder being movable with respect to the transceiver and adapted to be placed at a current distance, an electric circuit which is switched when the distance is lower or higher than a reference distance and a control and switching system. The transceiver device processes the return signal to generate a control signal with an electric parameter variable in function of the distance. The control signal is a periodic signal with a frequency and has a first spectrum with a middle interval and a second spectrum with lateral intervals shifted with respect the middle interval when the distance is higher than the reference distance, the parameter being associated to a frequency value that comprises either into the middle interval or into one of the lateral intervals.
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