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Magnet clasp

  • US 4,458,395 A
  • Filed: 11/16/1982
  • Issued: 07/10/1984
  • Est. Priority Date: 05/18/1981
  • Status: Expired due to Term
First Claim
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1. A magnet clasp, comprising:

  • a stationary part, said stationary part including;

    a nonmagnetic case having a closed bottom and an open top,a permanent magnet located within said case, having a first upper surface and a first lower surface,a first ferromagnetic plate having a first end, located on said closed bottom, and being secured to said first lower surface, anda nonmagnetic funnel-shaped cap defining a vertical hole providing a magnetic gap located directly above said first end, said cap and said case together completely enclosing said first ferromagnetic plate, and said permanent magnet except said first end at said vertical hole;

    a movable part, said movable part including a ferromagnetic plug having a bottom surface, fittable into said vertical hole; and

    means formed of ferromagnetic material, for establishing a magnetic connection through said vertical hole between said first end of said first ferromagnetic plate and said plug at said bottom surface when said plug is fitted into said vertical hole, such that said movable part is held firmly to said stationary part by a magnetic attracting force only when said plug is fitted into said vertical hole.

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