Improvements in and connected with Metallic Lathing for use in the Construction of Ceilings, Roofs, Partitions, and for similar purposes.
Year: 1898

page_text: Date of Application, 23rd Feb., 1898-Accepted, 7th May, 1898
COMPLETE SPECIFICATION.
Improvements in and connected with Metallic Lathing for use in
the Construction of Ceilings, Roofs, Partitions, and for similar
purposes.
We, HUGH LUPUS CUNNAII and HENRY ARTHUR HUGHES, both of 11, Queen
Victoria Street, London, Merchants, 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:-
The object of this invention is to construct metal laths for use in the construction
of fireproof floors, ceilings roofs and partitions in dwelling houses, offices,
factories, warehouses and other buildings in such a manner as to combine the
maximum strength and rigidity with the minimum of weight and and to provide an
efficient key for the cement or other plastic material used in conjunction with the
said laths.
The laths may be either straight or curved.
And in order that our said invention may be fully understood we will proceed to
explain the same with reference to the accompanying sheets of drawings in which
Fig. 1 shows a portion of metal lath constructed according to this invention.
Fig. 2 is section of same.
Fig. 3 shows a portion of an alternative form of metal lath also constructed
according to this invention.
Fig. 4 is section of same.
Fig. 5 shows blank ready for perforating and grooving or corrugating.
Fig. 6 shows section of an alternative form of lath.
Fig. 7 is elevation of a portion of same:
Fig. 8 shows section of same construction of lath but without central rib.
Fig. 9 is elevation of a portion of a metal lath having serrated edges of which
every alternate tooth is bent upwards.
Fig. 10 is section of same.
Fig. 11 shows application of our improved metal laths to the construction of
fireproof floors.
The same letters denote the same parts in all the figs.
The blank a as shown by Fig. 5 is either perforated by a suitable puncturing
machine and afterwards is grooved or corrugated by means of rollers or in a
suitable press or the grooving or corrugating may be effected in suitable dies.
Or the punching or perforating and grooving or corrugating may be performed
simultaneously while the blank a is passing through a suitable machine.
The blanks a are cut from sheet steel or other suitable material in such a manner
as to prevent waste as much as possible and for this reason the teeth or projections b
when serrated laths are constructed are staggered so that the portion of metal
removed from one blank to form the space c between two teeth forms the tooth of
the adjacent blank the only waste occurring at the edges of the sheet from which
the blanks are cut. The perforations d may be effected as hereinbefore specified
either in the blank or in process of grooving.

page_text: The blanks may be either sheared off the sheet or stamped or pressed out in
suitable dies.
The laths may be corrugated or grooved in curves as shown by Figs. 3 and 4 or
anglewise as shown by Figs. 1 and 2.
1
Or the grooves may be dovetailed in section as shown by Fig. 10.
The laths may be of any suitable length and are preferably attached to the
beams or columns supporting the floor, roof, ceiling or partition in such a manner
that the spaces between the teeth form a key for the plastic material used to form
the floor, roof, ceiling partition or the like.
In some cases the perforations may be dispensed with as shown by Figs. 6 & 7 the
lath is made of a strip of metal having a longitudinal rib f therein formed by
bending the metal to an obtuse angle and also turning the edges of the
strip over to an acute angle to form a key for the plaster.
In Fig. 8 the lath is shown without the central rib.
In Figs. 9 and 10 the lath is shown with the central rib dovetail in section and
with serrated edges each alternate tooth being turned over to form a key.
When used for the construction of fireproof floors the laths are placed across
from joist to joist to support the ceiling g and other similar curved laths are placed
over the ceiling laths see Fig. 11 to form a permanent centering for the concrete
floor h. The laths rest on the lower flanges of the joists and the space between
the curved laths and the top of the upper flanges of the joists is filled with
concrete h.
In any of the forms of lath shown the edges may be turned over as shown by
Fig. 6, 78, 9 & 10.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:
1. Corrugated or grooved metal laths perforated or otherwise for use in the
construction of floors, ceilings, roofs, partitions and similar purposes substantially
as hereinbefore specified.
2. Metal laths for use in the construction of floors, ceilings, roofs, partitions and
similar purposes having the edges turned over at an acute angle with the body of
the lath to form a key for the plastic material and with or without longitudinal
ribs, grooves or corrugations.
3. Metal laths for use in the construction of floors, ceilings, roofs, partitions and
similar purposes as shown by the accompanying drawings.
Dated February 22nd 1898.
H. C. FOWLER,
11, Furnival Street, Holborn, London, Agent for Applicants.