Static structures (e.g. – buildings) – Conduit – trim – or shield member at corner
Reexamination Certificate
1999-05-19
2001-04-10
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Conduit, trim, or shield member at corner
C052S255000, C052S288100, C052S417000, C052S717030, C052S713000
Reexamination Certificate
active
06212836
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to corner beads for drywall corner installation and more specifically to such a product that is self-aligning in installation.
BACKGROUND OF THE INVENTION
Typically, a corner bead for trimming a drywall corner has a central portion with two lateral edges and two flange portions, each extending from one of the lateral edges of the central portion.
It is also known to provide the flange portions with an array of apertures, either circular apertures or elongated slots, whereby the “mud”, when pressed onto the outer surface of the flange portions, can be thus pressed through the apertures or holes and into intimate contact with the underlying drywall. When pressed through the apertures such material or “mud” bonds with and helps to attach the corner bead to the underlying drywall.
Commonly, the central portion has an arcuate profile and defines a convex surface and a concave surface, whereupon the convex surface becomes the outer surface in use. If the convex surface has a large radius, for example within the range of from about 0.375 to about 1.5 inches, it is commonly known as a “bullnose” corner bead.
Weldy, U.S. Pat. No. Re. 34,547 discloses various corner beads, two-way and three-way corners having central portions with an arcuate profile and having two flange portions.
Koenig et al, U.S. Pat. No. 5,752,353 describes a drywall trimming article having an arcuately profiled, elongated central portion and two flange portions that are extruded unitarily. Each flange has a series or array of apertures as described above. In the case of Koenig et al, the outer surface of the corner bead is coated with a fibrous material to promote adhesion of the subsequently applied “mud”.
In installation, the corner bead is typically stapled or glued to the drywall corner prior to application of the dry wall finishing material or “mud” to maintain the positioning of the corner bead during “mud” application. The gluing or stapling can be a time consuming process in an otherwise rapid application process Additionally, most drywall corners are not perfectly square. Consequently, alignment of the corner bead with the underlying drywall corner can be difficult. Furthermore, failure to so attach the corner bead to the corner prior to “mud” application can result in slippage or movement of the corner bead from its proper location during such installation.
The simplification of the corner bead alignment with the underling drywall corner is often accomplished through the use of relatively complex and/or relatively expensive power tools that assist with alignment while stapling or gluing the corner bead to the underlying drywall The elimination of the use of such tools or the stapling or gluing operation entirely, would be of great value to the drywall installer in terms of time and cost. The mere ability to rapidly achieve corner bead alignment with the underlying drywall corner is of great value for the same reasons, even if stapling or attachment is still performed.
OBJECT OF THE INVENTION
It therefore an object of the present invention to provide a drywall corner bead that can be easily and accurately aligned with the underlying drywall corner and does not require fastening of the corner bead to the drywall prior to application of the “mud” to avoid movement thereof during “mud” application.
SUMMARY OF THE INVENTION
According to the present invention, there is provided an improved corner bead comprising an arcuately profiled, elongated central portion having two lateral edges and defining a concave and a convex surface, flanges extending from each of the lateral edges and unitarily formed therewith. The concave surface includes a pair of longitudinal rails extending at about 90° one from the other and along the geometrical centerline of concave surface
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, that serve to align the corner bead of the present invention with the underlying drywall, without the need for stapling, gluing or otherwise attaching the corner bead to the drywall to prevent relative movement thereof prior to application of the “mud”. Stapling, gluing etc. may, of course, still be used, if desired.
REFERENCES:
patent: Re. 345547 (1994-02-01), Weldy
patent: 4843771 (1989-07-01), Chapman et al.
patent: 4863774 (1989-09-01), Tucker
patent: 5086598 (1992-02-01), Weldy
patent: 5131198 (1992-07-01), Ritchie
patent: 5544463 (1996-08-01), Bergin
patent: 5740642 (1998-04-01), Koenig, Jr. et al.
patent: 5752353 (1998-05-01), Koenig et al.
patent: 5778617 (1998-07-01), Frec
patent: 5813179 (1998-09-01), Koenig, Jr. et al.
patent: 5913335 (1997-03-01), Rennich et al.
patent: 6044601 (2000-04-01), Chmela
Friedman Carl D.
Horton Yvonne M.
Plastics Components, Inc.
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