Improvements in the Manufacture of Open Metal Work for Use as Lattice Work, Trellis-work, Sieving or the like.
Year: 1885

page_text: Improvements in the Manufacture of Open Metal Work for Use
as Lattice Work, Trellis-work, Sieving, or the like.
I JAMES YATE JOHNSON of 47 Lincoln's Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of this Invention which has been
communicated to me from abroad by Florian Tentschert of Mödling Vienna in the
Kingdom of Austria Engineer to be as follows:-
This Invention has for its object to manufacture simply expeditiously and
cheaply metal sheets into lattice work, trellis-work sieving or equivalent open
metal work-According to this Invention a metal sheet is taken and at intervals
rows or circles of slits or slots are formed the slits or slots of each row "breaking
bond" with those of the adjacent row or rows-The plate is then pulled in a
direction or directions transversely to the length of the slits or slots and over a
suitable former or mould if desired and there is thus produced an open metal work
suited to the purposes to which ordinary lattice work or woven or interlaced metal
strips or wires are usually applied.
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, London, W.C.

page_text: Improvements in the Manufacture of Open Metal Work for Use
as Lattice Work, Trellis Work, Sieving, or the like.
I, JAMES YATE JOHNSON of 47 Lincoln's Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of this Invention which has been
communicated to me from abroad by Florian Tentschert of Mödling Vienna in the
Kingdom of Austria Engineer and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
This Invention has for its object to manufacture simply expeditiously and
cheaply metal sheets into lattice-work trellis-work sieving or equivalent open metal
work According to this Invention a metal sheet is taken and at intervals rows or
circles of slits or slots are formed, the slits or slots of each row "breaking bond"
with those of the adjacent row or rows-The plate is then pulled in a direction or
directions transversely to the length of the slits or slots and over a suitable former
or mould if desired and there is thus produced an open metal work suited to the
purposes to which ordinary lattice work or woven or interlaced metal strips or
wires are usually applied.
And in order that this Invention may be fully understood I shall now proceed
to describe more particularly with reference to the accompanying drawing the
manner in which the same may be performed.
Figure 1 represents a metal sheet having longitudinal parallel slits formed
therein ready to be stretched or pulled and opened out, and Figure 2 represents the
same sheet after it has been stretched or pulled and opened out.
Figure 3 shows a circular sheet of metal provided with concentric slits ready to
be pulled or stretched and opened out.
A sheet a of any suitable metal or alloy capable of being rolled, such for
example as iron steel brass or the like and of the required thickness is taken and
placed in a suitable machine or operated upon by a cutting or stamping instrument
to produce therein parallel rows of slits or slots as shew at b in Figure 1 in such a
manner that the full parts c of one row or range of slits are opposite to the slitted
parts b of the adjacent row or rows as shewn in Figure 1-A slotting machine of
any well known or suitable construction may be employed for making the slits in
the plate a, care being taken that the slits of the several rows are arranged in the
particular manner before described and shewn so that when the sheet is pulled
stretched or opened out openings will be formed as shewn.
The sheet a thus slitted or slotted is then pulled or stretched in the direction of
the arrows d. d that is to say transversely to the direction of the slits-The sheet a
may be pulled or stretched either when cold or it may be heated before being
stretched.
This pulling or stretching or opening out of the slits or slots may be effected by
means of any suitable stretching apparatus such for example as a combination of
pairs of blocks between which the opposite sides of plate are held the blocks being
forced apart by screw or other power.
By stretching out the sheet a lattice work having hexagonal openings or meshes
is formed as shown in Figure and according to the size of the meshes the area of

page_text: the lattice or trellis work produced will be increased over that of the unstretched
sheet or plate.
In the modification illustrated by Figure 3 the circular metal sheet a is provided
with concentric rows of slits and is intended for use in making baskets or other
articles of a cylindrical circular or conical form.
This may be effected in any convenient manner such as by stretching the sheet
out on or over a form or model of the required shape by means of suitably arranged
stretching mechanism as hereinbefore mentioned.
The length or size of the slits or slots and their distance from each other as well
as the kind of metal and thickness of sheet employed may be varied according to
the quality and purpose for which the article to be produced is to be used. Metal
lattices or trellis work constructed as herein before described may be advantageously
employed in place of that hitherto made by netting or twisting metallic wires or
by rivetting strips or bands of metal together by means of costly and complicated
machinery.
Having now particularly described and ascertained the nature of this Invention
and in what manner the same is to be performed I declare that what I claim is
1st The manufacture of open metal work for use as trellis-work lattice-work
sieving or other purpose by slitting or slotting a plate or sheet of metal and
afterwards pulling stretching or opening out the slitted or slotted sheet or plate
substantially as herein before described.
2nd Articles for use as trellis work, lattice work sieving or other purpose for
which interlaced or interwoven strips are employed the said articles being made
from slitted or slotted and stretched or opened out metal sheets or plates
substantially as herein before described.
3rd Articles of open metal work produced by slitting or slotting a metal plate
or sheet and stretching and forming it over a shape or mould substantially as
hereinbefore described.