Improvements in Metal Lathing.
Year: 1889

page_text: Date of Application, 8th Nov., 1889
Complete Specification Left, 26th July 1890-Accepted, 13th Sept., 1890
PROVISIONAL SPECIFICATION.
[Communicated from abroad by IRA S. ELKINS, of the City and State of New York,
United States of America.]
Improvements in Metal Lathing.
I, WALTER WHITFIELD BOSTWICK of 73 Queen Victoria Street in the City of
London, Engineer, do hereby declare the nature of this invention to be as
follows:-
The object of this invention is to provide a simple, easily manufactured metal
lathing so constructed that it will require a very small amount of mortar and which
will form a strong durable wall when in position, and is so made that it can be readily
utilized for brackets, cornices, or other purposes, as well as for plain plastering
purposes.
It consists in having the lath made of sheet metal with loops drawn up at regular
intervals over its face and in further providing the edges of the slots, from which the
loops are drawn, with upwardly turned flanges whereby the mortar is provided with
rounded faces on the back side of the sheet, so as to prevent cutting of the back
clinch; I take a sheet of metal of any suitable gauge and size; and in this sheet I
cut parallel slits in pairs at regular invervals, so that the rows alternate or break joint.
The body of the metal between the slits is then drawn forward or upward by suitable
dies, so as to form loops. The outer surfaces of these loops are slightly rounded.
All the loops are on the face side of the plate, or on the side to which the mortar is
applied thereby furnishing a plain smooth back face to the plate, enabling it to be
snugly fitted to the joist or studding.
Each of the slitted edges of the body of the plate is flanged that is, the edge
adjacent to the slit is turned outwardly or forwardly so as to form a rounded edge
on the rear side. The flanging of these odges 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. The loops thus constructed form arches over the entire surface of the
plate making it very rigid and greatly adding to the strength of the plate. 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 on any other form of metal lathing which depends on
open work to secure the clinch.
While I prefer the disposition of the loops as before described it is obvious that
the loops may be placed at right angles to each other or otherwise distributed in
relation to each other. For certain purposes and especially where no bending of the
plate is required the right angled disposition of the loops is preferable.
I prefer having the loops of equal width throughout but they may be narrowed
in the middle or otherwise modified in form the object being to provide wider
upturned flanges at the sides of the loop which may be an advantage for certain
kinds of work especially where a heavy coating of mortar is desired on the walls.
Dated this 8th day of November 1889
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Metal Lathing.
I, WALTER WHITFIELD BOSTWICK, of 73 Queen Victoria Street, in the County of
London, Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
My invention relates to metal lathing and has for its main object the provision of
a simple, easily manufactured metal lathing, so constructed that it will require a
very small amount of mortar and will form a strong durable wall when in position.
My improved metal lathing can moreover, be readily utilized for brackets, cornices,
or other purposes, as well as for plain plastering purposes.
My said improved lathing consists of sheet metal having loops drawn up at
regular intervals over its face, the edges of the slots, from which the loops are
drawn being provided with upwardly-turned flanges for the purpose hereinafter
specified.
In the accompanying drawings I have shown how my said invention may be
conveniently and advantageously carried into practice.
Figure 1 is a perspective view of my improved metal lathing.
Figure 2 is a cross section showing one of the loops.
Figure 3 is a top view showing the disposition of the loops over the surface of
the metal.
Figure 4 is a top view showing a modified disposition of the loops, and
Figure 5 is a view showing a modified construction of the loop.
A is a sheet of metal, of any suitable gauge and size in which are cut at regular
intervals parallel pairs of slits so that the rows alternate or break joint as shown in
Figure 3. The body of the metal between the slits is drawn forward or upward by
suitable dies so as to form loops B, the outer surfaces of which 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, thereby furnishing a plain smooth back face to the plate,
enabling it to be snugly fitted to the joist or studding.
Each of the slit edges of the body of the plate is flanged as shown at C, that is to
say the edge adjacent to the slit is turned outwardly or forwardly, so as to form a
rounded edge on the rear side as shown at D Figure 2. The flanging of these edges
serves a double purpose, first, to prevent too great a waste of mortar through the
openings between the loops and slit edges 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. The loops thus constructed form
arches over the entire surface of the plate, making it very rigid, and greatly adding
to the strength of the plate, as the loops are moreover 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
on any other form of metal lathing which depends on open work to secure
the clinch.
While I prefer the disposition of the loops shown in Figure 3 it is obvious that the
said loops may be disposed at right angles to each other as shown in Figure 4, or
otherwise distributed in relation to each other. By thus placing the loops the plate
is trussed in both directions, an advantage not obtainable where the loops are in rows,
as shown in Figure 3. For certain purposes and especially where no bending of the
plate is required, the right-angled disposition of the loops is preferable.
I prefer constructing the loops of equal width throughout as shown in Figures 1
and 3 but they may be narrowed in the middle, as shown in Figure 5 or otherwise
modified in form. The object being to provide wider upturned flanges at the sides
of the loop, which may be an advantage for certain kinds of work, especially where
a heavy coating of mortar is desired on the walls.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent I declare that what I claim is :-
The berein described improved metal lathing formed with pairs of slits, of
convenient length, at suitable intervals, disposed in parallel rows or otherwise, and
having the metal between each pair of slits drawn or forced outward on one side of
the sheet to form arched loops the edges of the slits being turned or flanged outward,
as and for the purpose specified.
Dated this 26th daw of Tal 1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.