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Remote switching device for smoke detector

  • US 4,788,530 A
  • Filed: 10/13/1987
  • Issued: 11/29/1988
  • Est. Priority Date: 10/13/1987
  • Status: Expired due to Fees
First Claim
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1. A switching device for a smoke detector of the dry-cell operated type, including a casing adapted to be secured to a ceiling, or similar out-of-reach elevated location, a smoke-detecting and alarm circuit with positive and negative connectors adapted to be connected to a dry-cell battery in said casing, said device comprising a housing adapted to be secured to an accessible location below said smoke detector, a holding relay having a winding and an armature, a dry-cell battery, a pair of terminals and a time-delay circuit located in said housing, said terminals adapted to be connected by wires to said connectors in said casing;

  • said battery in said housing connected to said armature and parallel-connected to one of said terminals and to said winding;

    the latter in turn connected to said time delay circuit, said armature having a first normal position in which it connects said battery across said terminals, and a second position held by said winding in which it disconnects said battery from the other of said terminals and connects said battery to said time-delay circuit, and spring means to return said armature to said first position upon opening of said time-delay circuit.

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