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Electronic combination lock with magnetic anti-attack interlock

  • US 5,271,253 A
  • Filed: 03/16/1992
  • Issued: 12/21/1993
  • Est. Priority Date: 03/16/1992
  • Status: Expired due to Fees
First Claim
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1. An anti-attack interlock mechanism comprising a housing;

  • a bolt slidably disposed within said housing for movement to an extended position and to a retracted position;

    a magnetically actuable means for enabling retraction of said bolt;

    means responsive to said magnetically actuable means for moving said bolt between said positions;

    a recess disposed within said bolt and extending to a surface of said bolt slidably engaged with said housing;

    a recess disposed in said housing aligned with said recess disposed within said bolt and extending to a surface of said housing in sliding engagement with said bolt;

    a magnet disposed in said bolt recess;

    a slidable interlocking member of a magnetically permeable material disposed within said bolt recess and axially aligned with said magnet;

    a magnetically permeable focusing means for focusing magnetic flux disposed within said frame recess;

    said recesses, said magnet, said focusing means and said interlocking member all oriented such that the axis of each is coaxial with the axis of the others when said bolt occupies a position extended from said retracted position sufficiently to secure a container to which said housing is attached;

    whereby application of an attack magnet to said housing to magnetically affect said magnetically actuable means to permit withdrawal of said bolt from said extended position creates transient magnets of said focusing means and said interlocking member and thereby attracts said interlocking member into proximity of said focusing means to span said recesses preventing movement of said bolt to said retracted position and upon removal of said attack magnet said focusing means and said interlocking member cease to be transient magnets and said interlocking member is magnetically attracted to said magnet within said bolt recess restoring said interlocking member to an inoperative position.

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