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CONTROL DEVICE FOR INDUCTION HEATING

  • US 3,622,138 A
  • Filed: 09/16/1969
  • Issued: 11/23/1971
  • Est. Priority Date: 09/16/1969
  • Status: Expired due to Term
First Claim
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1. An induction heating device for selectively heating portions along the length of an elongated workpiece having a central axis, said device comprising:

  • a frame element including means for supporting said workpiece for rotation about said axis;

    means for rotating said workpiece about said aXis;

    an inductor element encircling said workpiece;

    means for causing relative movement between said frame element and said inductor element in a direction parallel to said axis whereby said inductor element is moved with respect to said workpiece;

    control means connected to one of said elements for connecting said inductor to a source of alternating current only when said inductor element is opposite said selected portions of said workpiece, said control means including a source of electromagnetic radiation, a pickup means spaced from said radiation source, a control unit having a first condition when said pickup means is exposed to said source and a second condition when said pickup means is shielded from said radiation source, and means for connecting said source of alternating current to said inductor element only when said control unit is in one of said conditions; and

    , a movable control element fixed onto the other of said elements for movement with respect to said control means, said control element having spaced shielding means for causing said control unit to be in said one condition when said inductor element is adjacent said selected portions.

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