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Key chain alarm and light

  • US 5,475,368 A
  • Filed: 07/01/1994
  • Issued: 12/12/1995
  • Est. Priority Date: 07/01/1994
  • Status: Expired due to Fees
First Claim
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1. A key chain alarm and light assembly comprising:

  • a portable ergonomic casing adapted to be transported by a user, said casing comprising a first half and a second half adapted to be coupled together, said halves having perimeters that are substantial mirror images of one another, said coupled halves defining an interior, an exterior, and a portion adapted to be coupled to a key chain or an eyelet;

    a piezoelectric transducer disposed within said casing for acoustically vibrating air and producing loud sounds calling attention to the user;

    a resonator for mounting said transducer, said resonator comprising a biconcave plate spaced apart from said transducer and surrounded by a peripheral ring;

    an acoustic chamber formed within said resonator between said transducer, said plate, and said ring;

    an annular housing within said casing for receiving said resonator, said ring coaxially fitting within said housing;

    a reverberation chamber defined within said housing beneath said plate, said reverberation chamber bounded by an annular reflective surface formed in said casing and spaced apart from said plate;

    a transmission orifice defined in said plate for connecting said acoustic and reverberation chambers in fluid flow communication;

    an outlet orifice defined in said casing adjacent said housing for connecting said reverberation chamber in fluid flow communication with the exterior of said casing, said outlet orifice generally concentric with said transmission orifice and said annular reflective surface, said outlet orifice having a circular periphery;

    a reflector disposed within said outlet orifice for reflecting sound within said reverberation chamber;

    circuit means for activating said alarm means, said circuit means comprising a circuit board captivated between said casing halves;

    light means projecting from said casing for selectively illuminating said key chain or an eyelet; and

    ,switch means for selectively activating said circuit means or said light means, said switch means comprising a primary switch slidably captivated between said casing halves within a slot formed on the perimeter of both halves.

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