Improvements in Metal Lathing.
Year: 1891

page_text: Date of Application, 15th Sept., 1891-Accepted, 24th Oct., 1891
COMPLETE SPECIFICATION.
Improvements in Metal Lathing.
I, WALTER WHITFIELD BOSTWICK, of 38 Park Row, in the City, County
and State of New York, United States of America, Gentleman, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
In the accompanying drawing, Fig. 1 is a perspective view of my invention;
Fig. 2 is a cross section; and Fig. 3 is a modification.
A represents a sheet of metal of any suitable gauge and size. In this sheet I cut
parallel slits in pairs at regular intervals, so that the rows shall alternate, as shown
in Fig. 1. The body of metal between the slits is then drawn forward or upward
by suitable dies so as to form loops B. The outer surfaces of these loops are
slightly rounded, as shown. All, the loops are on the face side of the plate, or on
the side to which the mortar is applied.
Each of the slitted edges of the body of the plate is flanged, that is, the edge
adjacent the slit is turned outwardly or forwardly, so as to form a rounded edge
on the rear side, as shown at D, Fig. 2. The flanging of these edges serves a
double purpose, first, to prevent too great a waste of mortar through the openings
between the loop and slitted edge of the metal, and second to form a rounded edge,
against which the clinching-tongue of the mortar can rest without being cut off,
as would otherwise be the case, by its own weight. As the loops are directly over the
openings from which they are drawn, only a comparatively small amount of mortar
will pass through the openings, thus effecting a great saving in the amount of
mortar used, as compared with wood or wire lathing, and requiring much less
mortar than is used in any other form of metal lathing which depends on open
work to secure the clinch.
In order to give rigidity and strength to the sheet, I form a corrugation or
ridge in each space between the several rows of parallel slits. A special
advantage, aside from the increased strength and rigidity given by the corruga-
tions, is that the mortar applied to the plate is crowded by the inclined sides of the
corrugations under the loops, thereby anchoring the mortar and giving it a firmer
hold upon the plate. While the loops are preferably of equal width throughout,
as shown in the drawing, they may if desired be made narrower in the middle
than at the ends, or vice-versa.
In the modification shown in Fig. 3, the corrugations a are shown upon the side
of the sheet opposite to that from which the loops project.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, 1 declare that what I
claim is:
1. A metal lath consisting of a piece of metal performed with a series of pairs of
parallel slits arranged at suitable intervals, and having the hody of the metal
between the slits of each pair drawn forward or upward to form loops, all upon
the same side of the sheet, and having, between the rows of parallel slits or loops,
longitudinal corrugations, substantially as specified.
2. A metal lath consisting of a piece of metal formed with a series of pairs of
parallel slits arranged at suitable intervals, and having the body of the metal
between the slits of each pair drawn forward or upward to form loops, all upon
the same side of the sheet, the edges of the slits adjacent to the loops being pro-
vided with forwardly or upwardly turned flanges, and having longitudinal corruga-
tions between the pairs of parallel slits, substantially as set forth.

page_text: 3. A sheet metal lath having loops made in its face, arching over the openings
thus formed, the edges of the openings having forwardly or upwardly turned
flanges, and provided with longitudinal corrugations between the rows of loops,
substantially as set forth.
4. As a new article of manufacture, a sheet metal lath having loops made at
regular intervals over its entire surface on one side only, forwardly or upwardly
turned flanges along the edges of the said openings and longitudinal corrugations
between the rows of loops, substantially as set forth.
5. A metal lath having expanded loops on one side only, the said loops covering
or arching over the openings from which the loops are formed, and longitudinal
corrugations between the rows of loops, substantially as set forth.
Dated this 7th day of August 1891.
WALTER WHITFIELD BOSTWICK.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicant.