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Multiple function personal security alarm

  • US 4,438,428 A
  • Filed: 02/20/1981
  • Issued: 03/20/1984
  • Est. Priority Date: 02/20/1981
  • Status: Expired due to Fees
First Claim
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1. An alarm having multiple functions for the security of an individual within a preselected area, the alarm having a board mounting substantially all electrical components, comprising:

  • switch means for selecting among the functions the alarm performs;

    smoke detection means for optically detecting the presence of smoke in the preselected area including a light source for generating light, a light sensor for detecting light and opaque chamber means, said light sensor being positioned within said opaque chamber means in substantially perpendicular alignment to a longitudinal axis of transmission of light through said opaque chamber means from said light source, said opaque chamber means receiving light from said light source and isolating said light sensor from detecting light from said light source;

    intrusion detection means for detecting an unauthorized intrusion into the preselected area;

    alarm means for communicating to the individual the presence of a potential security threat; and

    plate assembly means housing said switch means, said intrusion detection means, and said alarm means and being secured to the board, said plate assembly means defining said opaque chamber means for permitting the transmission of light from said light source to said light sensor upon the presence of a preselected concentration of smoke in said opaque chamber means from the preselected area.

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