IMPROVEMENTS IN THE MANUFACTURE OF WIRE-NET
Year: 1882

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company,
Patent Solicitors, at Frankfort-on-the-Main, in the Empire of Germany,
for an Invention of "IMPROVEMENTS IN THE MANUFACTURE OF WIRE-NET."
A communication from Gustav Pickhardt, of Hagen, in the Empire of
Germany.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 14th January 1882.
FRANK WIRTH of the Firm of Wirth and Company Patent Solicitors at
Frankfort on the Main in the Empire of Germany. "IMPROVEMENTS IN THE
MANUFACTURE OF WIRE NET." [A communication from Gustav Pickhardt, of
Hagen, in the Empire of Germany.]
This Invention relates to improvements in the manufacture of wire net or
interlaced wire work which is composed of manifold spiral wires with cross-bars as
link pins and the said improvements are chiefly designed for the protection of the
edges of such net work.
This edge protection is obtained as follows that is to say: The said crossbars
instead of having knobs or collars are bent in hook form on both sides so that the
hooks of the said crossbars are bent into the middle of the spirals and are thus
protected against shifting.
At the same time the ends of each spiral wire are shortened and bent inwards so
that in this combination with the bent ends of the said crossbars the net work
retains a smooth edge which renders superfluous any further edge protection..
Instead of a single round crossbar or link pin two half round bars may be
employed the respective ends of which may be bent anchor-like from each other.
This is when it is necessary to use strong link pins.
The said metallic net work can be formed of wires of various section according
to the purposes for which it may be required.

page_text: The joining of the free ends of this net work may be made by means of one, two,
or three wire spirals which may be twisted spirally into the bent ends of the said
metallic net work according to the spiral inclination of the said net, thus forming a
smooth and close joint.
The said net work instead of being composed of double flat spirals of wire may
be constructed of single spirals.
Net work can also be produced by using instead of a flat spiral of wire only
single or double cylindrical spirals by screwing into and interlinking the contiguous
and corresponding coils of the same. This interlaced net work forms a kind of
open fabric and may be used for a variety of purposes amongst which are the
following that is to say as transmission bands for elevators, and other apparatus,
mine cables driving bands endless metallic cloths coverings for books, safes and the
like; as a protection against robbery, bullet proof armour for soldiers, window and
door shutters in the form of revolving shutters, Venetian blinds and the like, fire
proof stage curtains alone or in combination with a smoke intercepting covering
made of incombustible or fire proof materials; as a protection for ships against the
action of torpedoes, and as an elastic armour for ships of war.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frank Wirth in the Great Seal Patent Office on the 13th July
1882.
FRANK WIRTH of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort-on-the-Main, in the Empire of Germany. « IMPROVEMENTS IN THE
MANUFACTURE OF WIRE-NET." A communication from Gustav Pickhardt, of
Hagen, in the Empire of Germany.
This Invention relates to improvements in the manufacture of wire-net or
interlaced wire-work which is composed of manifold spiral wires with cross-bars as
link-pins and the said improvements are chiefly designed for the protection of the
edges of such trellis-work or net-work.
This edge protection is obtained as follows that is to say:-The said cross-bars
instead of having knobs or collars are bent in the form of a hook at each end, so
that the ends of the hooks of the said cross-bars are inserted within the spirals and
are thus prevented from shifting; the ends of each spiral wire, are also bent inwards
so that in combination, with the bent ends of the said cross-bars they will give to
the net-work a smooth edge which renders superfluous any further edge protection
such as leather india rubber or the like. Instead of a single round cross bar or
link pin two half round bars may be employed the respective ends of which may
be bent in opposite directions in the form of an anchor, when it is necessary to use
strong link pins.
The said metallic net work can be formed of wires of various transverse section
such as semi-circular rectangular or triangular according to the purposes for which
it may be required. The joining of the free ends of this net-work may be effected
as shown at a in Figure 2 by means of one two or three wire spirals which may
be twisted spirally into the bent ends of the said metallic net-work according
to the spiral inclination of the said trellis, thus forming a smooth and close
joint.
The said net-work instead of being constructed as shewn in Figures 1 and 2 or
of double flat spirals of wire may be constructed of single spirals as shewn in
Figure 3. Net-work can also be produced by using instead of a flat spiral of wire
only single or double cylindrical spirals by screwing into, and interlinking, the
contiguous and corresponding coils of the same as shewn in Figure 4.
This interlaced net-work forms a kind of open fabric and may be used for a
variety of purposes amongst which are the following, that is to say as transmission
bands for elevators and other apparatus mine cables, driving bands, endless metallic
cloths, covering for money, books, safes, and the like as a protection against
robbery. Bullet-proof armour for soldiers, window and door shutters in the form of
revolving shutters, Venetian blinds and the like, for fire proof stage curtains, alone
or in combination with a smoke intercepting covering, made of incombustible, or
fire-proof materials, as a protection for ships against the action of torpedoes, and
as an elastic armour for ships of war, the net-work in the latter case may be
folded several times and made to surround the ship's side to form a strong belt of
armour; or it may be placed within the more massive armour usually applied to
ships of war.
Having thus fully described the said Invention and the manner of performing
the same I wish it understood that I claim,
First. Forming a protection for the edges of wire-net by bending the ends of the
cross-bars and of the spirals substantially as set forth.
Second. The manufacture of wire-net with wires of semi-circular, rectangular,

page_text: triangular, or other transverse section, as hereinbefore described, instead of with
round wires.
Third. Joining the free ends of the wire-nets by means of one or more wire
spirals substantially as described with reference to Figure 2.
Fourth. The manufacture of wire-net by interlacing or interlinking round spirals
of wire, substantially as described and as shown in Figure 4.
In witness whereof I the said Frank Wirth have hereunto set my hand
and seal this Twenty-second day of May in the year of our Lord One
thousand eight hundred and eighty two.
זז
WIDT
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