Electronic safety device for a protection barrier

摘要

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.

主权项

1. An electronic safety device for a protection barrier, wherein the barrier comprises a fixed part and a movable part, the electronic safety device comprising:
a transponder (2) designed to be anchored to the movable part of the barrier and having an identification code (IID) stored therein; a transceiver device (3) anchorable to the fixed part of the barrier and adapted to receive from said transponder (2) a return signal (SRX) associated to said identification code (IID); said transponder (2) being movable with respect said transceiver device (3) and adapted to be positioned to a current distance (di) with respect the transceiver device; at least one electric circuit (S, S′) associated to the barrier and adapted to be switched when said current distance (di) is lower or higher to a predetermined reference distance (dr); and a control and switching system (4) having a master electronic circuit (5) connected to said transceiver device (3) and configured to process said return signal (SRX) and to generate a first output signal (SOUT) in response to said identification code (IID) for a switching of said at least one electric circuit (S, S′); wherein said transceiver device (3) is adapted to process said return signal (SRX) for generating a control signal (SC) having an electric parameter (P) variable in function of the current distance (di); and wherein said control signal (SC) is a periodic signal with a predetermined repetition frequency (fC), having a first frequency spectrum with a middle interval (F1) centered with respect to said repetition frequency (fC) when said current distance (di) is lower than or equal to said reference distance (dr), and having a second frequency spectrum with lateral intervals (F2, F3) shifted with respect to said middle interval (F1) when said current distance (di) is higher than said reference distance (dr), said electric parameter (P) being associated to a frequency value comprised either into said middle interval (F1) or into one of said lateral intervals (F2, F3) to promote the switching of said at least one electric circuit (S, S′).