US1824245A - Plaster board - Google Patents

Description

Sept. 22p 1931. c, w, UTZMAN 1,824,245

PLAsTER BOARD Filed Aug. 12, 1922 Patented Sept'. 22, 1931 UNITED STATES PATENT OFFICE CLARENCE W. 'UTZMAN, 0F CHICAGO, ILLINOIS, AS-SIGNOR, BY MESNE ASSIGNMENTS, T0 UNITED STATES GYPSUM COMPANY l PLASTER BOARD Application filed August 12, 1922,. Serial No. 581,361.

This inventionvrelatesto plaster board or the like, and to the method of making it. Plaster board is usually employed as a wall covering in substi ution for lath and plaster.

Among other objects, the invention is in# tended to supply a protected edge for plasterboard which shall be of neat appearance, secure and durable.

The invention resides in the novel construcw tions, combinations and methods, hereinafter described or claimed, for carrying out the above stated object and such other objects as will hereinafter appear.

In the drawings:

Fig. 1 is a fragmentary perspective showing an end of the plaster board and a protected edge thereof embodying this invention,

Fig. 2 is a cross section through the prof 30 tected edge on the line Q-Q of Fig. 1, and

Figs. 3 and 4 respectively, are sections similar to Fig. 2 butshowing modifications of the form shown in Fig. 2.

' Referring to the drawings, the body 5 of the plaster board is of plaster or the like,

with or without admixture of other ingredients. The body 5 has a top cover sheet 6 and a bottom cover sheet 7, preferably of heavy paper or the like adhered to the faces of the body. One of the covering sheets, the sheet- 7 in the illustrative instance, is folded at its mar in 8 so as substantially to cover the edge o the plaster body 5. To facilitate the folding of the margin 8, the sheet 7 is preferably scored. at 9`a1ong theline upon which the margin is to be folded.

The extremeedge of the margin 8 may be located in any desired relation to the edge of the' top sheet 6. For instance it is not indispensable that the edge of the margin 8 stances, and it is one of the objects of this invention to provide an eicient mechanical bond between the margin 8 or its equivalent contact with the top sheet 6,. or that the marthe margin 8 surrounding the aperture.

Thus anl integral part 11 of the body material may be made to engage the outer face of the margin 8 to hold it securely to the body. n

To enhance and facilitate the result just described, the outer surface of the margin 8 may be concaved into a cup-like form substantially .concentric withthe aperture, so that the plaster body material may project through the aperture and extend. into the cup-like concayity, while not projecting materially beyond the normal plane of the outer face of the lmargin 8. This eiiect is illustrated in perspective in Fig. 1.

Fig. Sillustrates a slightly different form for producing the same general result, the

margin 8 being shown as penetrated to form a more or less ragged aperture 12 therein having burrs 13, so to speak, engaging with the plaster of the body material. vHere again some of the material of the body makes an anchorage against outwardly dispos'ed parts of the margin 8.

In Fig. 4 the aperture 14 is formed so as to -leave a substantial tongue 15 to be engaged by the plaster body material, part of which may also anchor against the outwardly disposed shoulder 16 of the tongue.

It will be observedthat the various exemplary deformations of the margin 8 provide cllicient anchoring means located at intervals lengthwise the margin and occurring as frequently as may b'e deemed necessary to hold or assist in holding the margin in proper place. While the margin 8 is deformed at intervals for the purposes described, the margin between the deformations mayvremain intact and smooth to cover and protect the 100 edge of the board on that area over which the margin extends. Of course the details of construction described. may be variously modified. In the process of making the plaster board, the body material in a suitable plastic state may be spread to a uniform thickness or layer on the bottom covering sheet 7, the margin 8 of which may be folded upon and in adhering contact with the edge of the plastic layer; and the top covering sheet 6 may then be applied; both sheets adhering to the,

plastic body material substantially throughout the width of the board being manufactured. The aforesaid deformations in the margin 8 may, if desired, 'be preliminarily formed, in which event said deformations may be caused to embedin or interengage with the plastic body material by ,effecting a slight spreading of the material when the margin is folded aga-inst the edge thereof; or the said deformations may be made in the margin 8 after the margin is folded upon the edge of the body material and while the lat- .ter is still in plastic state, so as toA allow the plastic material to spread through the .apertures of the margin and engage against the outwardlydisposed shoulders thereof, to provide secure anchorages when the plastic material becomes set. The process maybe conveniently carried out by- .continuously passing upper and lower covering sheets and an intervening layer of plastic body material betwen suitable spreading rolls and lateral devices for turning up the margins of the lower sheet and pressing them a ainst the edges of the plastic material, and eforming the margins to secure anchorages inthe plastic material as aforesaid. f Having described my invention, I claim: l.-A plaster board comprising, in combiperforations.

along aline substantially coincident with the 5. A plaster board comprising in combi` nation a body of plaster or the like; normally' imperforate fibrous cover material covering the opposite faces of said body and adhering thereto; and a margin of said cover mav terialfolded over an edge of the body .and being rendered perforate by a series of openings, therein into which the material of the body extends, thereby providing anchorages with, the plaster body, said margin being constructed and arranged to expose a substantial area of the plaster body at the edge Qf the board. ,i

In testimony whereof, I have signed my name to this specification.

CLARENCE W. UTZMAN.

nation, a body of plaster or the like covering material on the face of said body; and alfolded cover sheet margin on an edge -of said body and anchored thereto by portions of the body material protruding through apertured portions of the margin.

2. A plaster board comprising a.body of plaster interposed between sheets of'fibrous material, one of said sheets having a.` perforated marginal portion folded over upon an edge of said body.

I3. A plaster board comprising a body of plasterinterposed between sheets of fibrous material, one of said sheets having a marginal portion folded over upon an edge of said body and terminating short of the full width of said edge, said marginal portion having a plurality of perforations extending longitudinally thereof.l f Y 4. A plaster board comprising a plaster body interposed between covering sheets of fibrous material, one of said sheets having a perforated marginal portion adapted to b e 65 folded over the edge surface of said body,

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