| 摘要 |
System which consists in the installation of an electric circuit which supplies suitable acoustic 6 and/or light 5 means, connected to the corresponding locking device 1 arranged on the fixed frame of the respective door 9, said circuit including a contactor 7 which is held in an open position by means of the actual assembly arrangement of the aforesaid locking device 1, but which has a tendency to close its contacts when free, with the result that, if the locking device 1 is forced, removed from its normal position, the aforesaid contactor 7 closes the circuit, causing the signals 6 and/or 5 to come into operation, provision having been made in the circuit for a timer 13 so that operation of the aforesaid signals takes place only for a determined period of time. <IMAGE>
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