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Publication numberUS1395032 A
Publication typeGrant
Publication dateOct 25, 1921
Filing dateJan 2, 1920
Priority dateJan 2, 1920
Publication numberUS 1395032 A, US 1395032A, US-A-1395032, US1395032 A, US1395032A
InventorsBirdsey Charles R
Original AssigneeUnited States Gypsum Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1395032 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)



1,395,032, Patented Oct. 25, 1921.




Specification of Letters Patent.

Patented Oct. 25, 1921.

To all whom t may concern: I

Be it known that I, CHARLES R. BIRDsEY, a citizen of the United States, residing at Hinsdale, in the county of Du Page and State of Illinois, have invented certain new and useful Improvementsl in Plaster-Board, (Case D,) of 'which the-following is a description.

My invention belongs to that general class of devices known as plaster board or the like and relates particularly to a type of board in which the plaster, plaster Paris or equivalent plastic material is substantially inclosed on both faces and on one or both opposite edges. The invention has among its objects the production of an improved board.. which fwill be simple, substantial, durable, satisfactory and eflicient and which may be economically and accurately manufactured, and in which the edges may be. perfectly formed to correspond to a definite specification as to size and shape. Many other Objects and advantages of the construction herein shown and described will be obvious to those skilled in the art from the disclosure herein given.

To this end my invention consists of the novel construction, arrangement and combination of-parts herein shown and described and more particularly pointed out in the claims.

In the drawings, wherein like reference l characters indicatev like or corresponding parts,

Figure 1 is a'sectional view through a portion of a plaster board embodying the invention,

Fig. 2 is a perspective view of a portion of the same board,

Fig. 3 is a similar view of a slightly modified construction,

Fig. 4 is a sectional view of a portion of a board illustrating a further step in the'construction, and f Fig. 5 is a view similar to Fig. 2 of another form\ of board. f

Referring to the drawings, particularly Figs. 1 `and 2, 1 represents a board of suitable material, as for example, plaster, plaster Paris, or any equivalent material suitable for the purpose which may be handled in a plastic state and thereafter allowed to set or harden. The body is inclosed by the covering sheets 2 and 3 of suitable material'and it may be mentioned that I have found paper of the desired weight or thickness very satisfactory for the purpose.

In the type of board illustrated in Figs. 1 and 2 I inclose the one or both side edges by a binder or strip 5 which covers the edge of the boardand is folded inwardly, as at 6 and 7, to overlie the two opposite sides of the faces of the board. The same is preferably scored at 8 before folding, so as to give a straight or regular edge, the contour of the edge bein as desired. In constructing the board, preferably seal the same by allowing a portion of the plastic body to flow in between the faces of the sheets 2 and 3 and the folded-in edges 6 and 7 as indicated at, 9. Any equivalent means for securing the folded-in edges to the covering. sheets 2 and 3 maybe employed. v

In the construction shown in Fig. 3, the edge binder is similar to that described except that it is constructed to overlie the body but on the exterior ofthe covering sheets 12 and 13. Referring to this figure,

11 represents the body and 12 and 13 the covering sheets, while 15 represents the binder having the extending folded-over edges 16 and v17, the same being preferably scored as at 18. In this case the same is sealed between the covering sheets as indicated at 19. In Fig-1 it is illustrated how the parts may be so pressed or so formed that the folded-over'ed es 16 and 17 will be substantially flush wit the exterior faces of the covering sheets 12 and 13.

In the construction shown in Fig. 5, 21 represents the body and 22 and 28 the covering sheets. In this construction 25 represents the edge binder which is folded overl as at 26 so as to overlie the body, the same being positioned on the exterior, as shown, or on the interior side of the covering sheets, as may be desired. The binder is preferably first scored as at 28, or folded so as to produce a comparativelynniform edge. The edge 27 of the binder 25 may engage with the sheet 22, as shown, or at the edge.

It will be noted that with all of the conl struetions described, the edge is substantially would need to be inclosed. The resulting product has a straight, smooth, finished edge and at a perfect angle the board being uniform in Width throughout its ien th. The completedl product has many `a vantages and it has increased strength and durability and an improved appearance. In case of handlin the edges are protected and there is no sifting or powdering of the body or breaking away of the ed e.

. Having thus describe my invention, it

is obvious that various immaterial modifi-y cations may be made in the same without departing from the spirit of my invention; hence I do not wish to be understood as limiting myself to thev exact form, construction, arrangement and combination of parts herein shown and described or uses mentioned.

What I claim as new 4and desire to secure by Letters Patent is:

A plaster board comprising a suitable body, a cover sheet arranged on each face thereof, and an edge binder strip at one edge of thebod folded to overlie the/body at each fa'ce...t ereof, the cover sheet) and edge i binder portion on each face of the body be# ing arranged to present al substantially continuous even outer face throughout the outer face of the board. .n

2. A plaster board of the lkind, described, comprising a suitable body, a cover sheet arranged Aat each face side thereof, and an edge binder arranged at each of the opposite edges and adherlng thereto, said binder folded in to overlie the body at the interior of the cover sheets.

3. A plaster board of the kind described comprising a suitable body, a cover sheet l arranged at each face side thereof, and separate edge binder strips at opposite edges:

folded to overlie the body at each face side thereof, and separate edge binder strips at opposite edges folded to overlie the body at each face thereof, the cover sheet and edge binder strip portion on each face of the. body being arranged to present a substantially continuous even outer surface throughout the outer faces of the board.

In testimony whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

p CHARLES R. BIRDSEY. Witnesses:


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6488792 *Dec 18, 2000Dec 3, 2002National Gypsum PropertiesMethod and apparatus for manufacturing cementitious panel with reinforced longitudinal edge
WO1988000268A1 *Jul 3, 1987Jan 14, 1988Flaekt AbA method and an arrangement for packaging two or more plaster boards
U.S. Classification428/122
International ClassificationE04C2/04
Cooperative ClassificationE04C2/043
European ClassificationE04C2/04C