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Automatic doorbell driver

  • US 7,429,924 B2
  • Filed: 11/13/2006
  • Issued: 09/30/2008
  • Est. Priority Date: 12/02/2005
  • Status: Active Grant
First Claim
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1. An automatic doorbell driver, comprising:

  • a. coupling means for coupling said automatic doorbell driver to a conventional doorbell system wherein said conventional doorbell system comprises a primary load;

    b. power extracting means for extracting power from said conventional doorbell system in an amount sufficiently large so as to permit operation of said automatic doorbell driver but sufficiently small so as to prevent inadvertent energization of said primary load of said conventional doorbell system;

    c. sensing means for sensing an object in a proximity zone; and

    d. switching means responsive to said sensing means for coupling power to, and thereby controlling the energization and de-energization of, said primary load of said conventional doorbell system;

    whereby said automatic doorbell driver can easily convert said conventional doorbell system into an automatic doorbell system.

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