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Light switching mechanism

  • US 4,344,071 A
  • Filed: 07/10/1980
  • Issued: 08/10/1982
  • Est. Priority Date: 07/10/1980
  • Status: Expired due to Term
First Claim
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1. A switch apparatus for automatically turning an electrical device on and off in response to a sensed condition comprising:

  • receiver means for sensing a particular condition and for providing a first signal in response to said particular condition;

    -timer means responsive to said first signal for providing a second signal having a duration lasting a predetermined time following initiation of said first signal;

    main switch means receiving said second signal for turning said electrical device on an off in response to said second signal; and

    power-providing circuitry connected on one hand to an A.C. power supply and on the other hand to said main switch means for providing operating power to said receiver means, said timer means, said main switch means, and said electrical device;

    said power-providing cicuitry comprising;

    bridge means for rectifying the voltage from said A.C. power supply to provide a rectified voltage;

    capacitive means for storing a charge from said rectified voltage; and

    first switch means for applying a portion of said rectified voltage to said capacitive means, whereby said receiver means and said timer means are powered by said capacitive means.

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