US1768867A - Plaster-board edge - Google Patents

Description

July 1, 1930.. j TURNER 1,768,867

PLASTER BOARD EDGE Filed May 1'? 1926 INVENTOR J o/m I Turner ATTORNEYS Patented July 1, 1930 UNITED STATES PATENT OFFICE JOHN J'. TURNER, 0F WILLIAMSVILLE, N W YORK, ASSIGNOR TO NATIONAL GYPSUM COMPANY, OF BUFFALO, NEW YORK, A CORPORATION OF DELAWARE PLASTER-IBOARD EDGE Application filed May 17,

This invention relates to plaster boards, and particularly to the construction of the edges of such boards. One of the principal features of this invention relates to the manner in which the edges of plaster board liners cooperate with the adjacent plaster, one of the distinguishing features of my invention being the provision of a liner having a beveled edge adhering to the plaster.

Those who have occasion to use or handle plaster boards faced on one or both sides with a liner are familar with the difficulties commonly encountered unless some effort is made to protect the edges of the product. If the plaster board is simply provided with liners which terminate flush with the edges of the board, there is always a tendency for the edge of the liner to become loosened from the plaster and there is a tendency for the plaster to crumble along the edges, where it is not protected in any way. Various attempts have been made to overcome these well-known difficulties, and the present invention may be considered as the result of such an attempt. Furthermore, this invention contemplates not only preventing the liner from being accidentally pulled away from the plaster along the edges of the plaster board, but it contemplates providing a plaster board having a certain amount of plaster exposed along the edge. This is desirable in order that adjacent boards will have a plaster to plaster contact with each other, or so that the cementing material used between adjacent boards can come in direct contact with the plaster.

In general, my invention contemplates the provision of plaster board liners which may be of ordinary construction and may be of the usual material, but with the added feature of having one or more beveled edges adapted to come in contact with the plaster and adhere to the same. If the plaster board liner is simply cut at right angles to thesurface of the liner, there is of course only a very small edge surface presented to which the plaster may adhere. I have found that by forming a beveled edge on the liner, it is possible to increase this'area toa considerable extent, and thus increase the bond 1926. Serial No. 109,620.

between the plaster and the edge of the liner. It is desirable, although not necessary, to make the improved product so that the sharp portion of the beveled edge of the liner will e exposed. Under certain conditions this avoids the formation of sharp projections on the bod of plaster which might easily break 0 and perhaps render the product unfit for use.

According to my invention, the liners with beveled edges can be applied to the plaster board in such a manner that the liners terminate at the edges of the plaster board instead of extending around the corner of each edge so as to cover a portion of the edge. According to one of the preferred embodiments of my invention, however, at least one of the liners is applied to the plaster board so that it covers a portion but not all of one or more .edges of the plaster board. Such portions are referably provided with beveled edges w ich adhere to the plaster adjacent thereto.

The various objects and advantages of my invention can be best understood by considering the following detailed description, which is to be taken in conjunction with the accompanying drawings, in which Fig. 1 is a perspective view of one embodiment of my invention; and

Fig. 2 is an enlarged section view of the product shown in Figure 1.

In the accompanying drawings I have illustrated a gypsum or plaster board which is of ordinary construction except for the manner in which the ends of the board are formed. The gypsum or plaster board proper is shown at 3, liners 1 and 2 being applied tothe faces of the plaster board. These liners can be made out of heavy paper, cardboard or any other material commonly used for this purpose, and they can be applied to the plaster surfaces in the usual manner.

Upon referrin to Figure 2, it will be noticed that the liner 1 is provided with a beveled edge 4 located near one edge of the plaster board 3. The liner 1 terminates at the margin of the plaster board; that is, it does not extend around the corner of the edge so as to cover any portion of the edge. The beveled surface is lar e in extent compared with what it woul be if the liner were simpl cut off at right angles to its surface, an accordingly there is a considerable area in actual contact with the plaster. This serves to prevent accidental loosening of the edge of the liner from the plaster, and even thou h the sharp edge of the beveled ortion 0% the liner is exposed, there is sufiicient bond between the remainder of the beveled portion and the plaster to prevent the liner from being accidentally pulled away from the plaster board.

It will be understood that when the liners are pressed in place on the plaster before the latter has hardened, the plaster is brought into intimate contact with the beveled edges of the liners, as shown at 4 in Figure 2.

Instead of having the liner terminate at the margin of the plaster board, as shown at 4 in Figure 2, I may have the liner extend around so as to cover a portion of the edge of the plaster board. A liner 2 having such an extended portion 6 is also shown in Figure 2. Portion 6 is preferably, though not necessarily, integral with the body portionof the liner 2. The portion 6 may be and preferably is provided with a beveled edge 7 adhering to the adjacent plaster. This insures an excellent bond between the plaster and the edge of the up-turned portion 6 of the liner 2.

The edge of the plaster board constructed as shown in Figure 2 is fully protected by the portion 6, which forms a protecting strip extending along the entire edge of the plaster board and across a portion of this edge. The remaining portion of the plaster board edge is exposed so that adjacent plaster boards will have a plaster to plaster contact, or so that the plaster of one board can be effectively cemented to the plaster of the adjacent board.

My invention adequately meets the requirements of quantity production; the plaster board liners can be easily provided with beveled edges and the edges can be easily bent so as-to form portions such as that shown at 6, which rotect the edges of the plaster board. T he edges of the board are not only adequately protected, but the edges of the liners are also fully protected because of the strong bond between these edges and the plaster. Furthermore, my improved product has practically all the advantages incident to having at least a certain amount of plaster exposed along the-edges of the board.

The stri of material 6, which extends along an e ge of the plaster board and part way across this edge, is preferably, though not necessarily, integral with one of the liners, for example, the liner shown at 2 in Figure 2. Such a liner may form the exposed or front surface of the plaster board and the back surface can be covered with a liner such as that shown at 1 in Figures 1 and 2. It is desirable to have the front liner provided with a portion such as that shown at 6, which prevents the plaster from being ex sed between adjacent laster boards. he liner for the back of t e board may be of exactly the same form as the front liner, or it may be of different form, as circumstances require.

It is to be understood that my invention is not confined to the single embodiment herein illustrated and described, but includes such modifications thereof .as fall within the scope of the appended claims.

I claim:

1. The combination of a plaster board and at least one liner adhering to the board, the said liner having a beveled edge in contact with the plaster and terminating at one corner of the edge of the board.

2. The combination of a plaster board, a liner adhering to one face side of the board, the said liner having a beveled edge in contact with the plaster and terminating at the adjacent corner of the edge of the board, and a strip of material extending along this edge of the board and spaced apart from the beveled edge of said liner so as to cover only a portion of this edge of the board, thereby exposing a considerable portion of said edge, said strip being of uniform thickness with a beveled edge adhering to the plaster.

3. The combination of a plaster board, a liner adherin to one face of the board and having the e ge thereof terminating at the adjacent corner of the margin of the board and a second liner adhering to the o posite face of the board, said second liner liaving a portion extending approximatel halfway across one edge of the plaster boar whereby a plaster to plaster contact may be established between said board and an adjacent board, the said ortion of said second liner having a beve ed edge adhering to the plaster.

In testimony whereof I afiix my si nature.

JOHN J. TUR ER.

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