USRE6590E - Improvement in metallic lathing - Google Patents

Description

l. V. HOLMES. Meta-Hic-Lathing.

Reissued Aug. 10, 1875;

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v i i l UNITED STATES PATENTOFFIQE.

ISAAC v. HOL ES, or MOUNT VERNON, onrqnssrenon on ONE-HALF INTEREST T0 JOHN coornn. a

impnovgmsur m METALLIC LATHING.

i Specification forming part of Letters Patent No. 84,881, dated December 15, 1868; reissue No. 6,590, dated August 10, 1875; application iled October 15, 1874.

7 .To altwho'm it may concern: 5 I

Be it known that I, Isaac V. HOLMES, formerly of the city and county of New York, in the State of New York, now of Mount Vernon, in the county of Knox and State of Ohio, have invented a new and Improved Metallic Lath- -ing,'as a supportingsurface for the plaster of narrow sheet-iron lathe as contradistiir' guished from plates of sheet-iron.

It is of the utmost importance to the permanency and excellency of the plastering to j secureits equable'drying, which will be more or less perfect, according asthe back surface of the plaster is left exposed by the laths. to a greater'or less extent.

Metallic laths have heretofore been made of solid strips of sheet metal, and, as they must necessarily be placed quite close together on the studs, in order to afford a proper support for the plastering, it ,followed that but comparatively' little of the rear of the plastering was exposed whenapplied to a frame-work of this kind, and that'it was apt to crack on ac count of unequal drying.

To overcome this difiiculty, the first part of my invention consists in forming perforations or slots in the lathe at short intervals, and making them of angular or curved outline in cross-section, for the purpose of stiffening them longitudinally, to admit of the use of as thin iron as is employed for the ordinary solid sheet-metal laths.

. The second part of my invention consists in supporting the laths in recesses in the studs, so that the weight of the plastering shall be transferred bythe laths directly to the studs, (not through intermediate fastening devices,) thus making a broad distinction between my mode of supporting the plastering and the old mode, where the laths do not engage the studs 3 directly, but are simply riveted or bolted thereto, so that in the latter case the weight of the plastering is supported by the rivets or bolts. In my case the laths are. permanently secured to the studs merely topreveut lateral displacement, and the distinctive feature of this part of, my invention is that of supporting the lathe in recesses in the studs; for any mode-of afterward securing them against lateral displacement may be adopted without afi'ecting the gist of this improvement.

However, I havealso made an improvement in the manner of fastening the lathe and studs together; and this consists in securing metallic laths' to metallic studs by bendingone overor upon the other, dispensing entirely with bolts and rivets usually employed for this purpose.

Figures 1, 2, 3, and 4 represent some at the diiierent forms of slits in studs, into the openings of which laths are to be received and fastened. Fig. 5 represents an end viewjof three laths in position, with the plaster coal] spread upon them, and keyed and fastened by portions of the plaster having passed into the openings provided for that purpose, the

stud having been removed in order to present.

this view. Fig. 6 represents an elevation, showing the openings in and between the lathe.

To enable others skilled in the art to make and use my invention,I will proceed to describe its construction and operation.

Iconstruct my'laths of sheet-iron, of greater or lessthickness, according to requirements of the wall as to strength, and of such length as may be cheap in the manufacture, and convenient in the use of them, and'ot such width as may best secure the same objects, and the additional objects of holding the coat of plaster and its equabl'e and uniform drying, so as to prevent its'cracking.

The lath is bent or curved back, so as to provide it with flanges alon its-edges, which not only constitute stiifening-ribs, but also form broad .or wide bearing-surfaces for the plaster key entering between the laths, and serve as a means for interlocking the lathe with suitably notched. or slitted studs. 1 make them of uniformthickness and width, except that each lath may Deformed so much narrower at one end than at the other as to allow that end-to be slipped into the adjoinin'g end of the next lath, so that my lathsmay be more readily spliced in that way to each other. Such joints may be made either .AVAlLABLl-I Cass tions or flanges are approximately straight,

and stand at nearly right angles to the tla face of the lath.

The series of slits, three in each series, f f f, are made in the front edges of the studs for the reception of these edges, leaving proper intervals between each and the next, so that the laths, when their edges are inserted in the slits, may be confined and fastened, as hereinafter described, and asshown in the drawings, by the tongues g g. r

The lath may be so constructed as to present beaded corners, a a a, which co-operate with the edges b b, to hold the mortar in place when forced between two adjoining laths. Then, as a further means of fastening the plaster in position, securing its equable dry ing, and preventing its cracking, I make open ings d d in the lath, of such length and at such intervals apart as maybest attain the object in view.

In the example illustrated these openings are formcdjn the following manner; I cut or punch two slits parallel to each other across the face of the lath, and aswide apart as the opening is intended to be long, and equidistant from the upper and lower edges of the face of thelath. Then I cut or punch a longitudinal slit in the centerof the lath, extending from one of these crossslits to the other, and then bend back from the face'of the lath each edge e e of the slit, just as I bent back each edge of the lath itself, as before described;

' and -l do this not only to make the opening :ibr' the mortar to enter, thus removing a portion .of the smooth lath -,surface, but also in order that these bent-back edges of the slit vmayaid the bent-back edges of the lath b b,

and 'the beaded corners afa a a, to key and hold the plaster coat firmly in place, as shown at d and 1; e e 0, Fig. 5. The edges of the iron studs are, of course, presented to the laths at thepoints' where thetwo edges of adjacent laths are to be fastened 'upon them, and there a series of three slits is cut, f f f, and thus the. two tongues g 9 ate formed. The lower edge of one l'atlr is placed in the upper slit in the stud, and th'e'upper edge of another lath is placed in the lower slit (of sameseries) in the stud, and then a drift-tool or wedge is driven into the middle slit, and by one operation, and perhaps by one blow upon the tool, the edge of each lath is securely fastened by the mere bending down upon it of the iron'tongues g g, and thus the laths are fastened upon the stud without either bolt, nail, or screw, when the'tool is withdrawn.

- By this my arrangement of the laths upon the studding, they may beplaced just as far apart as may be desired, in order to make the most effectual use of the beaded corners a, a, a a and the edges 1). b, and to secure the objects before mentioned.

By my construction of my laths, and their arrangement upon the studdiug, a much larger portion of the plaster used can be reached and dried by the air' on the rear side of the coat than by any other known or used heretofore. j

The bending back the edges of the laths, and the edges of the slits made in forming the openings, as described, greatly increases the stiffness of the lath, and thus enables it to resist more effectually pressure or concussions upon its surface.

I do not claim,broad ly, the openings herein described, when made generally and in any metallic sheet-lathing, such openings having been before made in broad sheets of metal used for lathing without regardto their size or form.

'What I claim, and desire to secure by Letters Patent, is p 1. A sheet metal lath having its edges bent or curved back in a manner accomplishing the twofold purpose of stifieniug thelaths and afibrding a broad bearing for the plasterkey. p

2. A perforated sheet metal strip -lath,

stifl'e'ned by having its edges bent or curved back.

3. The metallic sheet-lath described, when provided with rectangular openings, made by slitting the lath and bending back theedges e e, substantially as and for the purposedescribed.

4'. Lathing composed of studs provided with recesses, and laths supported in said recesses,'.substantially as and for the purpose specified.

5. The combination of a metallic stud and a metallic lath, connected and secured to; 5 gether by bending one over or upon the other. 5

to this specification in the presence of two subscribingwitnesse's.

Witnesses: ISAAC V. HOLMES.

S. '1. Dournmcr, JOHN Goornn.

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