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Flood light lamp removal alarm

  • US 5,619,185 A
  • Filed: 09/29/1995
  • Issued: 04/08/1997
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Fees
First Claim
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1. A flood light lamp removal alarm assembly for home security flood light fixtures having at least one socket accommodating at least one flood light lamp, said socket connected to a power supply for the lamp, the fixture having a low ambient light detector and a motion detector, wherein the assembly detects unwarranted unscrewing of the flood light lamp therefrom, comprising:

  • a housing containing a perceptible alarm;

    a means for detecting removal of the lamp, said means comprising the lamp socket having a physical condition sensor therein, which physical condition sensor is inactivated when said lamp is properly screwed in said socket, said physical condition sensor being activated when said lamp is loosened or removed from said socket;

    said sensor comprising a switch mounted in the bottom of said socket positioned in such a manner that when said lamp is properly screwed into said socket said switch is depressed in the closed position;

    electrical circuit means connected to said switch for triggering said alarm when said switch is released as a result of loosening or removal of said lamp, said alarm remaining inactivated as long as said switch remains depressed by said lamp, and said electrical circuit means including latch means for maintaining said alarm in the triggered state when said lamp is screwed back into said socket alter said alarm is triggered and said switch is depressed;

    means for slowing down the triggering of said alarm to immunize said electrical circuit from minor power disturbances and lightning; and

    reset means for permitting said electrical circuit to be reset after an alarm is triggered;

    wherein said slowing down means comprises a resistor, a capacitor and an inverter;

    said resistor biasing the input to said inverter to a "HIGH" condition except when said switch is closed, thereby shorting the input to ground, wherein said capacitor makes said electrical circuit immune to said minor disturbances, and if said lamp is loosed, said switch opens, thereby causing said resistor to pull up the input of said inverter, and said inverter responsive to said pull up for setting said latch means;

    said latch means responsive to said setting for activating said alarm in said housing until reset by said reset means.

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