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Key sensor alarm for door locks

  • US 5,680,094 A
  • Filed: 10/19/1995
  • Issued: 10/21/1997
  • Est. Priority Date: 09/22/1994
  • Status: Expired due to Fees
First Claim
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1. A key reminder device for use in combination with a key mechanization, said key reminder device comprising:

  • a power supply;

    a timer means electrically coupled to said power supply;

    a trigger arm hingedly disposed inside a key insertion slot of a key lock mechanism for detecting the insertion of a key into the key lock mechanism thereby initiating said timer, insertion of the key pivotally moving said trigger arm inside within the key insertion slot; and

    an audible alarm operatively associated with said timer;

    wherein insertion of a key in the key lock mechanism pivots said trigger arm thereby coupling said power supply to said timer completing a series electrical circuit for operating said audible alarm after a period of time to indicate that the key has been left in the key insertion slot.

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