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Release type electromagnetic device

  • US 4,020,433 A
  • Filed: 01/07/1975
  • Issued: 04/26/1977
  • Est. Priority Date: 01/18/1974
  • Status: Expired due to Term
First Claim
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1. A release type electromagnetic device comprising, in combination, two relatively elongated, substantially rectilinear pole pieces arranged in spaced substantially parallel relation;

  • a permanent magnet positioned between said pole pieces and having its magnetizing direction substantially perpendicular to the longitudinal extent of said pole pieces;

    a normally deenergized electromagnetic means operatively associated with said pole pieces and operable, when energized, to generate a magnetic flux opposing the magnetic flux of said permanent magnet;

    a movable magnetizable armature adjacent corresponding first ends of said pole pieces, forming pole faces, and normally attracted against said pole faces by the flux of said permanent magnet when said electromagnetic means is deenergized;

    spring means biasing said armature to disengage said pole faces; and

    means forming a magnetizable flux path adjacent said permanent magnet and opposing the flux path including said permanent magnet and said armature;

    said magnetizable flux path forming means, said pole pieces and said armature forming a closed magnetic circuit for the flux of said electromagnetic means, said closed magnetic circuit by-passing said permanent magnet.

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