US2176327A - Lath - Google Patents

Description

ct. 17, 1939. G. A. BuTTREss LATH g Mam/fw Buff/ess;

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Filed April 20. 1937 Patented Oct. 17, 1939 UNITED STATES PATENT OFFICE 6 Claims.

This invention relatesto ribbed lath and more particularly pertains to improvements in ribbed boards of the character set forth in United States Letters Patent Number 2,077,513 issued to me April 20, 1937.

An object of the invention is to provide a ribbed lath embodying hollow ribs in which the spaces within the ribs are enclosed to form dead air spaces within the lath.

A particular object of the present invention is to provide a lath of the above character in which the ribs of the lath are reinforced by sheet metal housed interiorally of the'lath ribs, and in which the metal reinforcements are so formed that they may be readily positioned within the ribs and -held in place therein.

With the foregoing objects in view together -with such other objects and advantages as may lsubsequently appear the invention is carried into effect las illustrated by way of example in the yaccompanying drawing in which:

Fig.r1fis a perspective View of a fragmentary po-rtion of the ribbed latch panel with portions broken away:

Fig. 2 is a detail in vertical section of the lath panel particularly showing the manner of forming the reinforced hollow ribs thereof:

l Fig. 3 is a perspective View of the sheet metal reinforcement:

Referring to the drawing more specifically A indicates a backing sheet which may be formed of any; suitable material such as paper, pulp board and the like, but which is preferably flexible. In some instances the backing sheet may consist of or may embody thin sheet metal. Where fire proofing is desired the sheet A may be formed of asbestos or other fire resistant fibrous material.

Mounted on the backing sheet A is a corrugated facing sheet B of flexible material, the corrugations of which are dove tailed in cross section toy form the sheet with a series of parallel hollow ribs 5 with adjacent ribs spaced apart and with dove tailed grooves or channels extending therebetween. The facing sheet B is preferably formed of at least two plies 'l and 8 of paper or similar sheet material, between which is interposed a moisture resistant layer 9 with which the sheets 'l and 8 are adhered together. The sheet B is affixed to the backing sheet A in any suitable fashion such as by an adhesive.

An important feature of the present invention resides in the provision of reinforcing strips C arranged within the ribs 5 which strips are formed of lengths of sheet metal having a transvers-e width substantially corresponding to the (Cl. l2-116) width of the inner faces of the ribs 5 and which sheets are formed with inturned marginal flanges I which are inclined inwardly relative to each other and'seat ony the inner faces of the inclined si-de walls Il of the ribs 5. the flanges l0 are spaced from the backing sheet A so as to impart a stiffening action only along the outer marginal portions of the side walls of the ribs and not interfere with the flexibility of the inner marginal portions of the side walls of the f ribs, and whereby the walls of the channels between the ribs are capable of being flexed from their juncture with the backing sheet to a point intermediate their inner and outer margins thus The inner margins of .p

rendering the sheet lath quite flexible throughout Avl5 except across the outer faces of the ribs, and greatly minimizing possibility of rupture of the lath at the juncture of the bottom walls of the channels and the side walls of the ribs. As a means for imparting longitudinal rigidity to the reinforcing strip it is formed with a series of longitudinally extending corrugations l2 which are spaced from the backing sheet so as to permit free flexing of the latter inwardly toward the reinforcing strip throughout the width of the portions of the backing sheet extending across the bases of the ribs and whereby the sheet lath may be readily rolled into a compact bundle and also applied to the inside sharply curved supporting structures as in forming coves. The reinforcing s trips C are preferably formed of lengths corresponding to the lengths or' the sheets B, and are arranged within the ribs with their ends extending ush with the end margins of the ribs and held in place by an adhesive. However the strips C are further held in place against the ribs by reason of being formed of a width to conform to the width of the inner surfaces of the-outer walls of the ribs and with the inwardly inclined flanges I0 seating in the acute angle formed at the juncture of the outer walls of the ribs and the side walls thereof.

In order to facilitate nailing of the lath board to a supporting structure the sheets B are formed with nail receiving apertures I4 adjacent the ends thereof, which slots pass through the reinforcing strip C` as indicated in Fig. 3 and through which the shanks of nails may be readily passed, thus avoiding driving of nails through the metal reinforcing strip. However the strip being formed of thin sheet metal is subject to penetration by nails and accordingly nails may be driven through the sheets B and reinforcing strip C where occasion so requires; the slots I4-l5 being particularly serviceable where the margins of adjacent panels are overlapped so as to minimize the necessity of driving nails through two overlying thicknesses of the sheet metal strips.

The operation of the invention is obvious since it is apparent that the ribbed sheets may be applied in the usual fashion as by nailing to a suitable backing structure in the manner common to applying ribbed boards. On being so applied the ribbed surface is plastered in the usual manner.

By the provision of the sheet metal reinforcing strip C collapsing of the ribs C in applying the plaster is prevented and furthermore metal ties are afforded throughout the lathed surfaces thus imparting strength to the walls covered by the lath.

The flanges l0 are shown made sufficiently narrow to confine them to the outer halves of the spaces within the ribs, but the width of said flanges may be greater so long as they do not eX- tend so close tothe backing sheet asto excessively impair the flexibility of the walls lll.

While I have shown and described a `s-pecic embodiment of the invention I do not limit myself to the exact details of construction shown, and the invention accordingly embodies such changes and modifications as come Within the purview of the appended claims.

I claim:

1. A hollow ribbed lath comprising a backing sheet, a facing sheet carried by said backing sheet, said facing sheet being formed with a series of spaced hollow ribs, said ribs and the grooves between contiguous ribs being of dovetail cross section, and metallic reinforcing strips arranged interiorally of said ribs, said reinforcing strips bearing against the inner faces of said ribs throughout and having longitudinal flanges bearing against the sides of said ribs with the margins of said flanges spaced from said backing sheet, said anges being confined to the outer halves of the spaces within said ribs.

2. A hollow ribbed lath comprising a backing sheet, a facing sheet carried by said backing sheet, said facing sheet being formed with a series of spaced hollow ribs, said ribs and the grooves between the side walls of contiguous ribs being of dove-tail cross section, and metallic reinforcing strips arranged interiorally of said ribs, said reinforcing strips bearing against the inner faces of said ribs and having longitudinal flanges bearing against .only the outer portions of the sides of said ribs; said strips being formed with longitudinally extending corrugations; the margins of said flanges and the walls of said corrugations being spaced a substantial distance from said backing sheet to permit flexion of the portions of said side Walls which are free from said flanges.

3. A hollow ribbed lath comprising a backing sheet, a facing sheet carried on said backing sheet, said facing sheet being formed with a series of Iparallel hollow ribs which have side Wall portions, and a sheet metal reinforcing strip extending interiorally of each of said ribs abutting against the inner surfaces of said ribs and adhered thereto and being spaced from said backing sheet a substantial distance to permit material flexion of parts of said Wall portions.

4. A hollow ribbed lath comprising a backing sheet, a facing sheet carried on said backing sheet, said facing sheet being formed with a series of parallel hollow ribs having side walls, and a sheet metal reinforcing strip extending interiorally of said ribs abutting against the inner surfaces of said ribs; said reinforcing strip being spaced a substantial distance from said backing sheet throughout.

5. A hollow ribbed lath comprising a backing sheet formed of re resistant fibrous material, a facing sheet carried on said backing sheet, said facing sheet being formed with a series of parallel hollow ribs having side wall portions, and a sheet metal reinforcing strip extending interiorally of said ribs abutting against the inner surfaces of said ribs and spaced a substantial distance from said backing sheet throughout, thereby leaving strips of said side wall portions free to flex to a material extent.

6. A hollow ribbed lath comprising a backing sheet, a facing sheet carried on said backing sheet, said facing sheet being formed with a series of -parallel hollow ribs having flexible side wall portions, and a sheet metal reinforcing strip extending interiorally of said ribs abutting against the inner surfaces of said ribs and spaced a substantial distance from said backing sheet throughout to permit flexing of a material part of said side wall portions; said backing sheet being formed of fire resistant fibrous material and said facing sheet being formed of fibrous material having limited moisture absorptiveness.

GEORGE A. BUTIRESS.

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