Drywall-trimming strip having bullnose portion with minimal set-back requirement

  • US 6,571,520 B2
  • Filed: 03/20/2001
  • Issued: 06/03/2003
  • Est. Priority Date: 03/20/2001
  • Status: Expired due to Fees
First Claim
Patent Images

1. A wall corner comprising:

  • first and second drywall panels, each of said panels having a thickness X not less than about 0.5 inch, said first and second drywall panels being at an angle relative to each other and in an abutting or closely spaced relationship to define an elongated corner, with said second drywall panel overlapping with an end of said first drywall panel through a distance Ov, where Ov is up to X −

    0.091 inch; and

    a drywall trimming strip which is an extrusion of a polymeric material, the strip having a central portion which has a bullnose region and two planar regions, one at each side of the bullnose region, the drywall trimming strip having two lateral flanges, each of which is joined unitarily to one of the planar regions of the central portion by a stepped junction, the central portion having an exterior surface and an interior surface and each lateral flange having an exterior surface and an interior surface, wherein the bullnose region of the central portion has an exterior radius in a range between about 0.200 inch and about 0.350 inch, each of the planar regions has a width of about 0.217 inch, as measured in a plane normal to the axis defined by the bullnose region, each stepped junction has a measurement of 0.095 inch approximately, as measured between a plane defined by the exterior surface of the bullnose portion and a plan defined by the interior surface of whichever of the lateral flanges is joined unitarily to the bullnose portion by said stepped junction, wherein the drywall-trimming strip has a thickness of 0.055 inch approximately, as measured between the exterior and interior surfaces of the bullnose portion and as measured between the exterior and interior surfaces of each of the lateral flanges, and the drywall-trimming strip is secured along said elongated corner defined by the first drywall panel and the second drywall panel with each drywall panel disposed against an interior surface of one of the lateral flanges with the first drywall panel abutting or to be closely spaced from the second drywall panel, and the second drywall panel set back from a plane defined by an outer surface of the first drywall panel by a distance as small as about 0.091 inch so as to avoid interference between the second drywall panel and the bullnose portion of the drywall-trimming strip.

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