US2311345A - Metal corner bead for dry wall construction - Google Patents

Description

Feb. 16, 1943.

w. MITCHELL METAL CORNER BEAD FOR DRY WALL CONSTRUCTION Filed 001;. 3, 1941 Q U. B-MITCHELL,

Patented Feb. 16, 1943- METAL CORNER BEAD FOR DRY WALL CONSTRUCTION Wiley B. Mitchell, Wichita, Kans., assignor of thirty per cent to F. N. Masemore, Wichita,

Kans.

Application October 3, 1941, Serial No. 413,556

2 Claims.

This invention relates to dry wall construction, and more particularly to the use of a corner bead in connection therewith.

According to the preferred embodiment of my invention the corner bead comprises a metal strip which is doubled on itself along a longitudinal line to form two portions connected by a bead, one of the strip portions being then bent to form an outstanding flange extending substantially at right angles to the other portion or flange. Each portion of the strip is provided with suitable perforations of relatively large size for the passage of cement and also with smaller openings for nails or other fastening means.

One of the difiiculties heretofore encountered in connection with dry wall construction corners has been a tendency to crack; therefore, the improvement must not only furnish a rigid corner which will prevent chipping when the corner is struck by blows, but also will hold the two sheets of plaster board together. Basically, that is done in two ways: First, a series of nails driven through, in the case of one flange, first the flange of the corner head then the plaster board into the studding, and inthe case of the other flange, through first the plaster board then the flange of the corner bead and finally the studding. Second, the cement which is designed for the purpose of making a tie between the two sections of plaster board should be Perfatape or similar material. The cement is not only used to fill the holes through the bead, but is put on top of the flange of the bead which goes over the plaster board and is trowelled down to a feather edge, thereby covering the metal and the nails.

An important feature of the bead is the fact that it furnishes not only a rigid edge, but serves as a support for a plaster tie between the two pieces of Sheetrock or other plaster material; that is, the holes in the corner bead permit plaster to extend from the edge of one piece of Sheetrock directly across to the edge of the other and prevent cracking, a dimculty which has always been considerable of a problem in dry wall construction.

The corner bead is designed to be used in conjunction with Sheetrock or similar dry wall material, one flange of the corner bead being underneath one section and on top of another section. In proper use, a little space of to A of an inch is left between the bead and the Sheetrock, and this space is filled with Perfatape or similar cement to prevent cracking at the juncture of the bead and the Sheetrock.

The invention will be more readily understood by reference to the accompanying drawing in which:

Fig. 1 is a perspective view of a portion of the improved corner bead or strip.

Figs. 2, 3 and 4 are actual views illustrating successive steps in connection with two plaster boards, Fig. 4 being a section on line 4-4 of Fig. 7.

Figs. 5 and 6 are similar views illustrating the use of the strip in connection with a single plaster board.

Fig. 7 is a front elevation partly broken away showing the corner strip applied to a dry wall construction.

Referring to the drawing the reference character A denotes a metal strip which is then bent along a center line to form two halves [0, ll, connected by a hollow tube portion or bead I2. 20 While the two halves l and l l are in contact a series of large openings l3 and I4 for passage of cement and a series of smaller openings 20 and 2| for nails or other fastenings are punched out. After the holes l3, I4, 20 and 2| have been punched out, the outer portion of strip II is then bent away from the strip l0 along a line I so as to form a flange I6 extending at right angles to the remaining portion I! of the strip II and to the strip Ii), vthe outer portion I8 of which is exposed and may also be termed a flange. Where the corner strip is designed to be used in connection with an arch suitable cuts Ill-I9 are made in the flange I6 connecting' the outer edge thereof with the apertures I4 as best shown in Fig. '7.

The method of using the strip in connection with two plaster boards is illustrated in Figs. 2, 3 and 4. In those figures the reference numeral 22 denotes suitable studding and the reference numeral .23 a strip of plaster board or Sheetrock. The corner strip is applied as indicated in Fig. 2 with a flange l8 secured to the plaster board by means of nails 24 passing through openings and extending into the studding. 45 The flange I6 is secured directly to the studding by means of nails 25 passing through nail holes 2|. It will be noted that the end of the plaster board is spaced slightly from the flange l6 of the corner bead as indicated at 29. A second 50 plaster board 26 is then secured over the flange [6 as illustrated in Fig. 3 and is secured in place by nails 2'! which pass through the plaster board of the flange l6 and the studding 22 as indicated in Fig. 3.

Cement is then applied as indicated in Fig. 4,' t

the cement covering the nails or other fastening means and extending through the openings l3 into the space 29 and at least partially filling the openings M. l

In Figs. 5 and 6 the use of the strip with one plaster board 26' extending at right angles to the studding 22 is illustrated. In this case the flange I8 is secured directly to the studding 22' by means of nails or other fastenings 24 and the plaster board 26 is secured to the studding by means of through the plaster board, the flange I6 into the stud-ding 22'. A finishing layer of cement 28' is then applied as shown in Fig. 6 and is described in connection with Fig. 4.

Where the corner strip is to be used in connection with an arch or the like the cuts [9 in the flange [6 allow the corner bead to be curved as illustrated in Fig. '7.

While the corner strip may be of any desired size or dimensions, I have found it convenient to form the bead from a blank initially about three inches across so that when bent upon itself the strip NJ and H are approximately 1%; inches wide. The flanges l6 and I8 are each approximately 1 inch wide. The openings l3 and M in the flanges l8 and I6 respectively being directly opposite each other permitting the plaster or cement to tie across from one piece of Sheetrock to the other. These openings come to within /2 inch of the outer edge of the bead 12.

For preferred use the edges of the Sheetrock strips 23 and 21 have sufiicient clearance to permit access of mortar. The nailspass through both the Sheetrock and the bead into the studding, and these together with the bead itself and the mortar tie, make a corner which cannot be broken or chipped and which will not crack or break with changes in temperature or settling.

The invention has been described in detail for the purpose of illustration but it will be obvious that variations and modifications may be resorted to without departing from the spirit of the invention.

I claim:

1. A dry wall construction comprising a stud- [l0 nails or other fastening devices 21 passing,

ding, a plaster board extending at right angles thereto, and a corner bead composed of a double metal strip having a bead portion and a pair of flanges formed integral therewith and extending 5 at right angles to each other, one flange being secured direct at the studding and the other being secured tothe studding through said plaster board, one of said flanges bein interposed between the plaster board and the studding; said flanges having cement receiving openings therein, and cement filling said openings, the end of said plaster board terminating short of the corresponding flange, leaving a space therebetween, and a layer of cement extending through said openings into said space and covering the exposed portions of said corner bead.

2. A dry wall construction comprising a studding and two sheets of plaster board secured to the studding at right angles to each other by means of a corner bead, said corner bead comprising a strip of metal doubled along a longitudinal center line, having a bead at the folded over portion and an out turned flange extending at right angles to the remainder of the strip, both portions of the doubled strip being provided with large cement receiving openings, and with smaller nail openings, one portion of said strip overlapping the outer face of one of the plaster boards and the out turned flange being interposed 30 between the studding and the inner face of the other plaster bead, fastening means securing the parts together, one set of fastening means passing first through one flange of the corner bead, then through one sheet of plaster board and thence into the studding, and the other passing successively through the other sheet of plaster board, the out turned flange of the corner bead, and then through the studding, the ends of said plaster board sheets terminating short of said flanges, leaving spaces therebetween, and a layer of cement extending through said openings into said spaces, and covering the exposed portions of said corner beads and heads of said fastening means.

WILEY B. MITCHELL.

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