DEVICE FOR CHECKING RING OF ALARM IN TUNNEL

专利名称：DEVICE FOR CHECKING RING OF ALARM IN

TUNNEL

发明人：ICHINO SHOICHI,SUGIHARA WATARU申请号：JP15399091申请日：19910529公开号：JPH04352100A公开日：19921207

摘要：PURPOSE:To reduce the number of wires and to easily execute wiring byincluding a sound sensor in an alarm. CONSTITUTION:An alarm power supply part 5, analarm tone generating part 6, and the sound sensor DC power supply part 7, a soundmonitoring circuit 8 are included in the case body of the alarm 1. Only when the alarm 1rings, power is supplied to the power supply 5 and the alarm tone generating part 6 isdriven by power supply from the power supply 5 to generate an alarm tone. Drivingpower for the circuit 8 is supplied from the power supply 5 through the power supplypart 7. Thereby only when the alarm 1 rings, the circuit 8 is made monitoring enabledstate, and when the alarm 1 does not ring, malfunction is not generated by other soundfrom the external. The output of the circuit 8 is transmitted to a monitoring station 3,which monitors whether operation is normal or not.

申请人：FURUKAWA ELECTRIC CO LTD:THE

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