Magnetic attachment system having a non-magnetic region

  • US 8,354,909 B2
  • Filed: 05/21/2012
  • Issued: 01/15/2013
  • Est. Priority Date: 04/04/2008
  • Status: Active Grant
First Claim
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1. A detachable cover attachment system comprising:

  • a base structure; and

    a removable cover, said removable cover capable of being attached to said base structure by magnetic force interaction between said base structure and said removable cover;

    said base structure comprising a base structure attachment section, said base structure attachment section comprising a first plurality of magnetic field sources, said first plurality of magnetic field sources having a plurality of north magnetic polarities and a plurality of south magnetic polarities, said base structure attachment section having at least one base structure non-magnetic region disposed between at least two magnetic field sources of said first plurality of magnetic field sources, wherein said base structure non-magnetic region does not substantially produce a magnetic field; and

    said removable cover comprising a cover attachment section, said cover attachment section comprising a second plurality of magnetic field sources, said second plurality of magnetic field sources having a plurality of north magnetic polarities and a plurality of south magnetic polarities, said cover attachment section comprising at least one cover attachment non-magnetic region disposed between at least two magnetic field sources of said second plurality of magnetic field sources, wherein said cover attachment non-magnetic region does not substantially produce a magnetic field, said base structure attachment section and said cover attachment section being movable relative to each other along a linear range of positions corresponding to a linear spatial force function, said linear spatial force function for said linear range of positions comprising one and only one peak attract spatial force and a plurality of off-peak spatial forces, said plurality of off-peak spatial forces having a greatest off-peak spatial force, wherein said peak attract spatial force for said linear range of positions is between three and five times the greatest off-peak spatial force.

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