Boxable Mesh Adhesive Drywall Corner Trim

Abstract

A boxable drywall corner trim including an elongated semi-rigid member that forms a pair of flanges joined at a grooved hinge along a centerline. Each of the flanges can have a thinner part and a thicker part joined at a step that is approximately parallel to the centerline a predetermined distance from the centerline. The thicker part of the flanges can form a protruding nose member that makes the piece boxable by preventing the cross-over of wet drywall mastic or mud from one flange to the other. The thinner portion of the flange may optionally be perforated with a pattern of punched holes of any configuration throughout the flange assembly. The piece can have a wall-facing paper or other fibrous layer of material that has a tacky adhesive on its wall-facing side. The adhesive can be in a pattern of dots, ridges, lines or any other pattern, or the adhesive can be continuously coated on the surface. A layer of mesh can be trapped between the semi-rigid member and the outer paper layer, the mesh may or may not optionally penetrate into the plastic or other material of the semi-rigid member. When the entire piece is hot extruded, the mesh normally penetrates the plastic.

Description

[0001]This application is a continuation of co-pending application Ser. No. 11 / 657,389 filed on Jan. 24, 2007. Application Ser. No. 11 / 657,389 is hereby incorporated by reference.BACKGROUND[0002]1. Field of the Invention[0003]The present invention relates generally to the field of drywall corner trim and more particularly to a boxable mesh adhesive drywall corner trim.[0004]2. Description of the Prior Art[0005]Drywall corner trim originally was metal corner bead. Several years ago, a new type of corner trim was invented that was a hinged plastic with paper covering. This type of trim is described in U.S. Pat. No. 6,148,573. U.S. Pat. No. 6,148,573 is hereby incorporated by reference. One problem with existing corner bead and trim products is that they were not boxable. By boxable, I mean the ability to put wet mud on both sides of the product without waiting for one side to dry. Historical trim products required the application of mastic or drywall mud compound to one side of a corn...

AI Technical Summary

Benefits of technology

"The present invention is a boxable mesh, adhesive drywall corner trim that combines adhesive, mesh, and trim into a single product that allows for quick, strong, and economical installation. The invention includes an elongated semi-rigid member with flanges that can be joined at a grooved hinge along the centerline. The flanges have a thinner part and a thicker part with a protruding nose member that prevents the cross-over of wet drywall mastic or mud. The thinner part can also have holes punched through it. The piece can have a tacky adhesive on its wall-facing side and can be applied, moved, removed, and re-applied if necessary. A layer of mesh material can be placed on the room-facing surface of the flanges, and a second paper or fibrous material layer can be added. The mesh layer can penetrate the plastic of the semi-rigid member."

Problems solved by technology

One problem with existing corner bead and trim products is that they were not boxable.

It is well known in the drywall industry that many corner trim materials are difficult to apply using mechanical methods of attachment such as nails or adhesive, and are very susceptible to damage after application and finishing.

The damage usually takes the form of cracked edges at the flange edge of the material as the dried mud cracks during impact, or building structural movement.

One of the major problems with that system is that the piece is not boxable.

Another problem is that the continuous layer of adhesive taught does not adhere uniformly to the drywall board.

This system has similar problems.

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