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Home security system

  • US 4,446,454 A
  • Filed: 01/21/1981
  • Issued: 05/01/1984
  • Est. Priority Date: 01/21/1981
  • Status: Expired due to Fees
First Claim
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1. A security system for a home having at least one entry point and pre-existing electrical wiring for distributing electrical power therein, the system comprising:

  • an intrusion detection sensor proximate said entry point, for sensing an intrusion at said entry point and providing an intrusion detection signal in electrical form in response to sensing said intrusion;

    a primary monitoring unit near said intrusion detection sensor and electrically coupled thereto, and including means for selectively deactivating said primary monitoring unit, said primary monitoring unit receiving said intrusion detection signal and providing a primary alarm signal in human audible form a first predetermined time period after receiving said intrusion detection signal unless selectively deactivated within said first time period;

    a secondary monitoring unit within the audible range of the primary monitoring unit and electrically coupled to said wiring, and including means for selectively deactivating said secondary monitoring unit, said secondary monitoring unit detecting said primary alarm signal and providing an alarm detection signal in electrical form via said wiring a second predetermined time period after detecting said primary alarm signal unless selectively deactivated within said second time period; and

    a central monitoring unit electrically coupled to said wiring, and including means for selectively deactivating said central monitoring unit, said central monitoring unit receiving said alarm detection signal and providing a secondary alarm signal in human perceivable form a third predetermined time period after receiving said alarm detection signal unless selectively deactivated within said third time period.

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