Process for producing rollformed sections

  • US 5,979,055 A
  • Filed: 12/23/1996
  • Issued: 11/09/1999
  • Est. Priority Date: 01/08/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. In a method that combines(a) making a grid beam, including making a web of two adjacent layers in the beam, from metal strip, by continuously passing the metal strip through successive sets of rolls that act on the strip, with(b) strengthening the grid beam, as the beam is being made, by(1) lancing two parallel slits into the two layers of the web longitudinally of the beam and displacing the two layers of the web between the slits to form a depression that is open in a first surface of the web, as the web passes through one set of rolls;

  • the improvement comprising;

    (2) interlocking the two displaced layers of the web by striking the first surface of the web along and outside the depression to compress and cold flow metal into the depression, as the depression passes through another set of rolls.

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