US 1492588 A
Description (OCR text may contain errors)
C. W. UTZMAN COMPOSITE BUILDING BOARD AND METHOD OF M Filed June 14, 1922 CLARENCE W. no H, OH BUBFALQ, NEW YORK, ASSIGNOR, BYIEESNE ASSIGNMENTS,
TO '1 BEAVER I 'RODUCTS COEANY, INC., A CORPORATION OF NEW Y:
COMPOSITE BUILDING B0 f AND METHGD OF BEING: SAME.
Applicationfiled June 14, 1922. erial lilo. 568,273.
To all whom it may concern:
Be it known that CLARENCE W. U'rzMAN, a citizen of the United States, and a resident of the city of Bufialo, in the county of Erie,
-' State of New York, has invented an Tmprovement in Composite Building Board and Methods of Making Same, of which the following is a specification.
This invention relates to composite building board, such as plaster board or the like,
and tothe method of making it.
Among other objects, the invention is intended to provide an improved building board, such as plaster board, the edges of 1a which are protected by the margins of the covering material and which are finished ed in such a manner that the ed es of the covering material are not readily oosened or torn.
The invention consists in the novel conea structions, combinations and methods, hereinafter described or claimed, for carrying out the above stated object and such other objects as will hereinafter appear.
The invention may be more readily understood by reference to one illustrative method and construction embodying the invention and shown in the accompanying drawing.
In said drawing: Fi 1 is a perspective view of a portion of the p aster board. Fig. 2 is a cross section thereof taken along the .line 2-2 of Fig. 1.
Fig. 3 is a cross section similar to Fig. 2 but illustrating the board as it appears at an intermediate stage of manufacture.
This application is a continuation in part of my prlor application Ser. 374,833, filed April 19, 1920.
The invention is illustrated as applied to a double-face plaster board, that is, a board either side of which may be employed as the face side of the board. In the drawing, 10
and 11 designate cover sheets, which may be termed for convenience to and bottom cover sheets, respectively. Suc cover sheets are preferably of fibrous material of the proper weight and quality, such as paper. Between the cover sheets is a body 120i plaster or the like to which the cover sheets preferably adhere.
Preferably, a cover sheet 10 somewhat wider than the intended width of the board is employed to. provide margins 13 which may be folded over the edge of the board. The edges'l i: of the cover sheet are preferably beveled or otherwise reduced in thickness to a thin edge so that, when the margins are cemented in place, the free edges of the cover sheet merge into the edge of the board and are practically obliterated. They do not therefore present any projectin edges which might become caught and resu t in loosened or torn paper. r V K In the illustrative board, the cover sheet 11 is also somewhat wider than the intended width of the board, providing margins 15 which are folded over the edge of the plaster body. In this arrangement the margins 13 are folded over the mar ins 15 and cemented in place by any suitab%e adhesive, such as plaster or glue, which will resist the action of moisture and heat to which it may be exposed during the various steps in the manufacture of the board. Tf desired, the margins 13 may be made of such a width as to extend substantially across the entire edge of the board. 1
Plaster board of this character may be manufactured in any suitable manner. If what is termed as the continuous process be employed, plaster is placed in suitable quantities upon a traveling cover sheet, called the bottom sheet. As illustrated, the cover sheet 11 may conveniently be employed as the bottom sheet and the margins 15 thereof turned up at some stage of the manufacture of the board to confine the plaster between the upturned margins. The top cover sheet is applied and the plaster spread to an even depth across'the board.
At some stage in the manufacture of theboard, either before or after the application of the top cover sheet to. the plaster, though preferably before, the marg1ns 13 thereof are beveled or suitably reduced in thickness at the entreme edges to provide athin edge which when cemented in place will rovide no means by which the margins may ecome caught and torn or loosened. In the construction illustrated in Fig. 3, the under side of the margins 13 is beveled, This may be conveniently accomplished by passing the margins over grindin devices, such as rapidly rotating emery w eels, having grinding surfaces. arranged at the proper an Is to produce the required bevel. After t is treatment of the margins 13, they are cemented in place firmly so as practically to obliterate any exposed coversheet edge. The grinding or beveling of the cover sheet edges removes the surface loss or finish and so roughe'ns it as to enable it to be substantially united with or merged into the edges of the board.
' Obviously, the construction, conformation or shape of the edges of the board may be varied according to particular requirements.
If desired, the cover sheets may be scored to weaken the aper along the lines 16 and 17 to permit t e margins to be folded over sharply and to form sharp or square edges on the finished plaster board.
' Obviously, the invention isnot limited to any particular construction and the details l of the illustrative board and method of makmargins-so as to provide a thin edge therefor and cementing said margins m place, whereby the edges of said margins substantially merge into the surface ofthe board.
2. The method of making plaster board.
' of the kind described, which comprises providing covering material for the opposite faces of a body of laster or the like, folding certain cover s eet margins to envelop ,the edges of the body and cementing the same in lace, said margins being so treated as to su stantially obliterate any exposed cover sheet edge.
3. The method .of making plaster board I of the kind described, which comprises pro viding covering material for the opposite faces of a body of plaster or the like, proedge, and cementin viding cover sheet margins for folding over the edge of said body, and treating said margins so as substantially to obliterate any exposed cover sheet edge when said margins are folded in place.
4. The method of making plaster board of the kind described, which comprises providing covering material for the opposite faces of a body of plaster or the like, providing cover sheet margins for folding over the edge of said body, reducing the thickness of said margins so as to provide a thin said margins in place so that said thine ge substantially mer es into the surface of the edge of said boar 5. The method of making plaster board the opposite faces 0 messes which comprises applying cover sheets to the -o posite faces of a body of plaster or the l e, foldin the cover sheet margins over the edge 0 the board and cementing the same in place, certain cover sheet margins having been reduced in thickness so as to bbliterate any exposed cover sheet edge.
6. The method of making plaster board which comprises applying cover sheets to the. like, beveling the edges of certain cover a body of plaster or sheet margins to produce a. thin edge, folding the cover sheet margins over the edge of saldbody in overlapping relation with said beveled margins on the outside and cementing the same in lace.
. The metho of making plaster board which comprises applying top and bottom cover sheets to a body of plaster, or the like, of reater width than the intended width of t e board, grinding the margins of one sheet to produce a thin ed e, folding said cover sheet margins over t e edge of the board with said thin-edge margins exposed,
and cementing the same in place.
8. The met 0d of makingplaster board which comprises applying top and bottom cover sheets to a body of plaster, or the like, of greater width than the intended width of the board, grinding the under surface of the margins of said top sheet to produce a beveled edge, folding said sheet margins over the edges of said bod in overlappingrclation, with said top s eet margins exposed, and cementing said margins in place.
9. A laster board comprising, in combination, a body, cover sheets covering the opposite, faces of said body and adhering thereto to reinforce said body from edge to edge, certain of said cover sheet margins being folded over the edges of said board and being beveled to make a thin edge which substantially mel lges into the plane of the edge of said boa 10. A plaster board comprising, in combination, a substantially rigid body, cover sheets covering the opposite faces of said body and adhering thereto to reinforce said body from edge to edge, certain of said cover sheet margins being folded over edges of the/body and reduced in thickness and cemented in place so as to obliterate substantially any exposed edge of said folded marwhich substantially merge into the plane of the edge of said board.
said margins being reduced in thickness toprovide thin edges therefor memes 12. A plaster board comprisin' in comhistentielly to obliterate the line of demarcanation, a plaster body; fibrous s eets cover-' tion between it and the underneath margiing opposite feces of the body and adherent ml portion. thereto; the marginal portions of the sheets In testimony whereof, I have signed my 6 being folded one over the other and united name to this specification. at the body edge; the outer marginal portion being tapered adjacent its edge suh- CLARENGE W. UTZMAN.