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Fire detector and fire alarm system having circuitry to detect removal of one or more detectors at a signal station

  • US 4,369,435 A
  • Filed: 07/25/1980
  • Issued: 01/18/1983
  • Est. Priority Date: 07/27/1979
  • Status: Expired due to Term
First Claim
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1. A fire detector comprised of a detector head and a socket, said socket being connected across a pair of lines leading to a signal station and serially connecting, through said detector head, one of said pair of lines to a succeeding fire detector formed and connected identically with said fire detector, which detector is characterized by a means for disconnecting said one line from said signal station temporarily when said detector head is being removed from said socket.

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