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Apparatus for extending broad metal surface areas with a magnetically impelled arc

  • US 5,508,492 A
  • Filed: 03/15/1994
  • Issued: 04/16/1996
  • Est. Priority Date: 03/18/1991
  • Status: Expired due to Fees
First Claim
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1. Apparatus for electric arc graining electrically conductive sheet or plate material having a substantial surface area and traveling past the apparatus during the graining process, said apparatus comprising:

  • at least one electrode including an elongated loop body portion and an elongated continuous loop tip projecting laterally from a general plane of said body portion, said loop body and tip having two essentially parallel elongated side path portions and two arcuate end path portions that complete the loop of the electrode;

    means for establishing an arc between said tip and electrically conductive material;

    continuous magnetic means including a first loop pole member spaced outwardly around and generally concentric with said loop tip, and elongated in the direction of side path portions of the loop tip, and a second elongated loop pole member opposite in polarity to said first pole member and having a continuous surface disposed generally within and substantially concentric with said loop tip; and

    means for energizing said pole members such that a magnetic field extends between the pole members whereby an arc established between said tip and the electrically conductive material is moved in a repetitively continuous manner about the loop of said tip and across said material in contact therewith as it travels past the arc.

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