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

• Current Assignee: Trim-Tex Incorporated
• Original Assignee: Trim-Tex Incorporated
• Inventors: Budzik, Mark, Koenig, Joseph M. Jr.
• Primary Examiner(s): Friedman, Carl D.
• Assistant Examiner(s): Nguyen, Chi Q
• Application Number:
  US09/812,604
• Publication Number:
  US 20020134035A1
• Time in Patent Office: 805 Days
• Field of Search: 522/72, 522/73, 522/76, 522/77, 522/56, 522/55, 522/57, 522/871, 522/881
• US Class Current: 52/287.1
• CPC Class Codes: E04F 13/06 Edge-protecting borders borders for joints between plaster layers and window or door frames or like E06B1/62
• CPC Class Codes: E04F 2013/063 for corners

Abstract

As extruded from a polymeric material, such as polyvinyl chloride, a drywall-trimming strip has a central portion, which has a bullnose region and two planar regions, one at each side of the bullnose portion. Further, the drywall-trimming strip has two lateral flanges, each of which is joined unitarily to the bullnose portion by a stepped junction. The bullnose region has an exterior radius of 0.350 inch approximately. Each planar region has a width of 0.217 inch approximately, as measured in a plane normal to an axis defined by the bullnose region. Each junction has a measurement of 0.095 approximately, as measured between a plane defined by the exterior surface of the bullnose portion and a plane defined by the interior surface of the flange at such junction. Having a thickness of 0.055 inch approximately, the strip is adapted to fit along an elongate corner defined by two drywall panels, each of which has a thickness not less than 0.5 inch approximately and each of which is disposed against an interior surface of one of the lateral flanges, while permitting a first panel to abut or to be closely spaced from a second panel without requiring the second of panel to be set back from a plane defined by an outer surface of the first panel, by a distance larger then 0.091 inch approximately, so as to avoid interference with the bullnose portion.

Claims

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 O_v, where O_v 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.

2. A method of forming a wall corner according to claim 1, comprising the steps of:

securing said first and second drywall panels at an angle relative to one another, whereby said second dry wall panel overlaps said first panel up to X −

0.091 inch;

securing said drywall trimming strip to said elongated corner with one of said lateral flanges having an interior surface secured to said first drywall panel and the other of said lateral flanges having an interior surface secured to said second drywall panel.