US1372741A - Expanded-metal lath - Google Patents

Description

nNTTan sTaTas 'PATENT @FFHCCEO' CLARENCE DICKIB'TSON, OF YOUNGSTOWN, OHIO, ASSIGNOR T0 THE YOUNGSTOWN PRESSED STEEL COMPANY, OF YOUNGSTOWN, OHIO, A. CORPORATION OE OHIO.

EXPANDED-IVIETAL LATE.

Specification of Letters Patent.

Application led June 2, 1920. Serial No. 385,896.

.To all whom t may concern.'

Be it known that I, CLARENCE W. DioxinsoN, a citizen of the United States, and resident of Youngstown in the county of Mahoning and State of hio, have invented certain new and useful Improvements in Expanded-Metal Laths, of which the following is a specification.

My present invention relates to improvements in expanded sheet metal lathing and aims to provide a construction which will produce a ribbed structure which will be of maximum stiffness or rigidity while requiring a minimum amount of metal. rIhe invention further aims to provide .a construction in which the ribbed portions will be of reticulated or open work nature as well as the remaining portions of the sheet so that the entire extent thereof will be open to the free passage of the plaster and in which there will be no solid portions which divide the plaster into strips or which tend to cut the plaster in any way.

Ribbed or trussed expanded sheet metal lathing as heretofore produced, so far as I am aware, has generally been of two types. One of these types is known as the herringbone type but in such lathing the meshes are usually too large and if made smaller, the lath requires too much metal for its construction, utilizes too much plaster, and the solid sections of metal intervening between the rows of expanded portions divide the plaster into strips and tends also to cut it.

The other type is what is known as the diamond mesh type, in which it has been proposed to provide diagonally arranged continuous beam portions and to raise the general plane of the lath from the carrying surface by pressing or deflecting the reticulated metal to form diagonal ribs embodying such beam portions, the ribs being formed of two walls of open work metal.

Such construction is open to the objection that the corrugations by being diagonally arranged do not reach from one support to another so as to give the required sti'ness to the sheet between the supports. It also requires too much metal to form the double wall of the rib, and the beam portions referred to are double and tend to separate the plaster.

My said invention avoids the objections above set forth and it includes the novel construction hereinafter described and particularly defined by the appended claims.

The invention is illustrated in the accompanying drawing in which:

Figure 1 1s a plan view or surface portion of a. sheet to illustrate the invention;

Fig. 2 is a transverse section of line 2-2 of Fig. 1;

F Figi 3 is a sectional view on line 3-3 of Fig. 4 is a sectional view of the lath in place against a supporting wall with the plaster applied thereto; and

Fig. 5 is a section at right angles thereto.

In making a lath, according to my invention, I bend a sheet of diamond mesh expanded metal along longitudinal lines at a lurality of points in the width of the lath. he lath is indicated generally by the nuineral 1, by deflecting the strands vertically v in opposite directions substantially perpen-'V dicular with the plane of the sheet, and on spaced lines which are parallel with the longitudinal edges of the sheet.

A convenient manner of effecting this is to pass the sheet between a pair of rollers having suitably formed surfaces, which causes the sheet to assume the appearance shown in the drawing, in which there are parallel rows of substantially vertical portions indicated at 1a, which are connected by the inclined or oblique portions of sections indicated at 1b.

The resulting lath may be said to coinprise a plurality of longitudinal open work sections 1b which lie in planes oblique to the general surface of the lath, which sections are formed of sinuous 4strands extending lengthwise of the sections and connected together at separated alternating points, the adjacent edges of the sections being connected to one another by other sinuous strands extending between said adjacent edges and lying in planes substantially perpendicular to the sections, said connecting strands joining the strands of the oblique sections at separated alternating points and securing a truss effect.

The substantially vertical portions, it will be observed, by referring particularly to Fig. 3, are formed by deflecting the strands a and a vertically along equidistant lines parallel with the edges of the sheet, and it will be seen that all portions of the ribbed sheet thus produced are of a reticulated nature and are open to the free passage of the plaster. It will also be seen that a construction is provided which is extremely Patented Mar., 29, 1921i.'

stiff and self-supporting between the joists or stu-dsor like elements to which the lathing is attached. lt will be further seen that a contstruction is provided which'may be fastened in contact with a flat surface where desired and so as to have the plaster material iow around the same for the effective keying of the plaster thereto and which will be self-bracing, there being no portion which can4 yield or buckle under the pressure of the trowel in applying the plaster, such yielding being extremely detrimental as the return of the lath to normal position after the pressure of the trowel is removed tends to throw olf or loosen the plaster.

lt will be further seen that my improved stii'ened sheet is practically the same on both sides, so that either face may be secured in position. j

Having thus described my invention, what I claim is:

1. As a new article of manufacture, a lath having in combination, a plurality of longitudinal openwork sections, lying in planes oblique to the general surface of the lath, said sections being formed of sinuous strands extending lengthwise of the sections and connected together at separated altertions being united by intervening openwork,

sections which are substantially perpendicular to the plane of the sheet.

3. As an article of manufacture an expanded metal sheet of the diamond mesh type having sections exten-ding longitudinally of the sheet and lying in planes oblique to the general plane of the adjacent edges of said sections being united by sinuous strands which extend substantially perpendicular to the plane of the sheet.

In testimony whereof, ll aix my signature.

Witnesses:

A. J. WATSON, A. M.. HAYDEN.

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