US1171421A - Plaster-board. - Google Patents

Description

S. M. FORD.

PLASTER BOARD.

APPLICATION FILED AUG-9, 1915.

1,171,421, Patented Feb. 15,1916.

f'nv'e 721%?" 5170215 Frfl SILAS M. FORD, OF ST. PAUL, MINNESOTA.

PLASTER-BOARD.

Specification of Letters Patent.

Patented net. s, 1916.

Application filed August 9, 1915. Serial No. 44,508.

fastened to the" studding or beams of struc-' tures to constitute a foundation for plaster.

Among the objects of the invention is to provide a plaster board of flexible sheeting, preferably waterproofed, which is corrugated to form lath like projections and intermediate depressions so that there will be air spaces beneath the plaster at every ppint of its surface, whereby to provide sound deadening and heat insulating spaces under the entire surface of the plaster.

Further objects are to provide a lath board which will be resilient enough to yield to the expansion of the plaster so as to prevent the same from cracking and which has reinforcing strips embodied therein to hold the corrugations to form.

Nith these ends in View the invention consists in the construction, combination, and arrangement of parts hereinafter described and claimed.

In the accompanying drawings showing an embodiment of the invention, Figure l is a perspective view of a fragment of plas ter board embodying and shown secured to a backing board; Fig. 2 is a perspective view of the same without the backing; and Fig. the board as shown in Fig. l.

The plastering board of the presentinvention is made of a sheet rial, preferably waterproofed paper, such as rope stock surfaced or impregnated with asphalt or the like. The sheet is bent or molded under pressure to form. corrugations or alternate lath projections and depressions having the cross sectional shape shown in Fig. 3 of the drawings. As here shown every other lath projections is of keyed lath shape with its sides inclined downwardly and inwardly toward each other at an acute angle, such as the projections 2 shown in the drawings, while alternatingv with these projections are lath projections 3 having their sides inclined outwardly away from each other at an obtuse angle to the face of the lath projection. Between the lath prothe present invention 3 is an end view of of flexible mate;

jections are depressions or recesses 4 located in the angle between the inwardly inclined sides of the projections 2 and the outwardly inclined sides of the adjacent projections 3. Beneath each keyed lath projection 2 is a triangular air space 5 contracting toward the bottom, and beneath each projection 3 is an air space 6 spreading or widening toward the bottom.

To hold the lath projections to form, that is to prevent them from being flattened or crushed in use, as well as to provide means ing strips extending transversely across the corrugations at spaced intervals. In the drawings I have shown the reinforcement strips in the form of strips 7 piercing and passing-transversely through the sides of the corrugations beneath the lath faces thereof. As a further or substitute means of holding the strips to form I have in Figs. 1 and 3 shown the corrugated board secured to a backing sheet 9 by means of staples 8. which. from slipping help to hold the plaster lengthwise along the depressions between the lath projections.

NVhen the plaster is laid upon the board it will cover the projections 2 and 3 and fill in the angular depressions or recesses 4 between the projections.

shape shown in the drawings the spaces 6 beneath the projections 3 extend entirely under the recesses 4 and theplaster laid therein, as best shown .for preventing the plaster from slipping,'l prefer to embody in it one or more re-inforc-,

An important fea I ture of the plaster board is that by giving the corrugations the in Fig. 3, as well as under the projections 3,

while the triangular spaces 5 not only underlie the projections 2 but extendpart way over the adjacent recesses 4 and overlap the ends of the spaces 6, so that there is an insulating air space or! entire surface of the plaster.

I claim: i

1. A plaster board comprising a sheet of flexible material corrugated to form lathlike projections and intermediate plaster receiving recesses, every other projection being formed in the shape of a keyed lath with inwardly inclined sides, and the intermediate projections being formed with outwardly inclined sides, the inclination of the sides being such that the air spaces beneath said prof the same.

air spaces under the 2. A plaster board comprising a sheet of flexible material corrugated to form lath like projections and intermediate plaster receiving recesses, every-other projection having inwardly inclined sides and the intermediate projections having outwardly inclined sides, the inclination of the sides being such that the air spaces beneath the outwardly inclined projections Will underlie the plaster receiving recesses at the sides of said projections.

3. A plaster board comprising a sheet of flexible. material corrugated to form lathlike projections and intermediate recesses,

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