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Selective magnetic lifting system

  • US 4,801,911 A
  • Filed: 09/11/1987
  • Issued: 01/31/1989
  • Est. Priority Date: 09/11/1987
  • Status: Expired due to Term
First Claim
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1. A method of assembling a first magnetic member on a second magnetic member utilizing an electromagnet and a separable permanent magnet, comprising the steps of contacting said first member with said permanent magnet held by said electromagnet with said electromagnet being energized at a first current level to reinforce the field of said permanent magnet, moving said electromagnet, said permanent magnet and said first member as a unit to shift said first member into engagement with said second member, reversing the polarity of said electromagnet while energizing it at a second current level to separate said electromagnet from said permanent magnet while leaving said permanent magnet in magnetic engagement with said first and second members, moving said electromagnet away from said permanent magnet, securing said first and second members together by means independent of any magnetic force, moving said electromagnet back into engagement with said permanent magnet, energizing said electromagnet at a third current level to reinforce the field of said permanent magnet, and thereafter moving said electromagnet and said permanent magnet as a unit away from said first and second members.

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