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Security and fire protection system

  • US 4,641,127 A
  • Filed: 01/30/1985
  • Issued: 02/03/1987
  • Est. Priority Date: 01/30/1985
  • Status: Expired due to Term
First Claim
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1. A premises protection system for protecting premises connected to the central office of a telco system by telephone lines against fire and/or intrusion, said premises protection system comprising:

  • (a) a telco central office comprising;

    (1) an operator'"'"'s console including display means;

    (2) a switching network for selectively connecting telephone lines together, to other central offices and to said operator'"'"'s console; and

    ,(3) automatic number identification circuitry connected to the display means of said operator'"'"'s console for causing said display means to display the number of a calling telephone when said switching network connects a telephone line carrying an operator dial signal to said operator'"'"'s console;

    (b) a plurality of telephone lines, one end of each of said telephone lines connected to said switching network of said telco central office; and

    ,(c) a plurality of protected premises subsystems, one located at each premise to be protected, each of said premise to be protected also being located at the other end of one of said plurality of telephone lines, each of said protected premises subsystems comprising;

    (1) a plurality of detector-transmitter units positioned about each of said protected premises, each of said detector-transmitter units including;

    (i) a detector for detecting a predetermined condition and conditioning an output signal when said condition is detected; and

    ,(ii) a transmitter connected to said detector for receiving said conditioned output signal and producing a wireless radio frequency signal when said conditioned output signal is received; and

    ,(2) a receiver-alarm unit for;

    (i) receiving said wireless radio frequency signals produced by said transmitters of said detector-transmitter units;

    (ii) seizing the telephone line running from said protected premises to said switching network of said telco central office when a wireless radio frequency signal produced by the transmitters of one of said plurality of detector-transmitter units is received;

    (iii) initially transmitting an operator dial signal to said telco central office via said seized telephone line; and

    ,(iv) subsequently transmitting an alarm tone signal to said telco central office via said seized telephone line.

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