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Portable hazard warning apparatus

  • US 4,668,940 A
  • Filed: 08/28/1984
  • Issued: 05/26/1987
  • Est. Priority Date: 09/07/1982
  • Status: Expired due to Fees
First Claim
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1. Portable electrically operable apparatus for monitoring and for giving warning of the presence of a predetermined environmental hazard in the neighborhood of the apparatus, said apparatus comprising:

  • a portable housing;

    an electrical power source arranged in the housing;

    a first monitoring unit arranged in the housing and including at least one detector for responding to the presence of a predetermined environmental hazard;

    a second monitoring unit arranged in the housing to monitor the operation of the apparatus for fault detection;

    a warning indicator arrangement provided on the housing and which is connected to the first monitoring unit and to the second monitoring unit, the indicator arrangement being operable to provide a warning indication upon the detection of a predetermined hazard by the first monitoring unit or upon fault detection by the second monitoring unit; and

    a safe-operation indicator arrangement provided on the housing and connected to the first monitoring unit and to the second monitoring unit, and operable to provide a safe-operation indication in the absence of hazard detection or fault detection by the first and second monitoring units respectively.

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