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Fire alarm having a sensor on an extensible arm

  • US 4,178,592 A
  • Filed: 01/23/1978
  • Issued: 12/11/1979
  • Est. Priority Date: 01/23/1978
  • Status: Expired due to Term
First Claim
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1. A portable fire detector comprising:

  • (a) a sensor for producing an electrical signal when detecting signs of a fire,(b) alarm circuitry coupled to said sensor for producing an alarm signal when said electrical signal is received from said sensor,(c) alarm means coupled to said alarm circuitry for producing a detectable warning signal when activated by said alarm signal,(d) a power supply coupled to said sensor, alarm circuitry and alarm means for providing operating power thereto,(e) housing means for containing said alarm circuitry, alarm means and power supply, and(f) extensible means pivotally and rotatably attached to said housing means for receiving said sensor at the outermost end thereof whereby said sensor may be positioned anywhere within a hemisphere of revolution generated by sweeping said extensible means through 360°

    of rotation about its pivot point while moving from a vertical position to a horizontal position, the maximum radius of said hemisphere of revolution being equal to the fully extended length of said extensible means and the minimum radius of said hemisphere being equal to the shortest collapsed length of said extensible means.

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