Improvements in the Manufacture of Compound and Insulated Wires.
Year: 1892

page_text: Date of Application, 24th Feb., 1892-Accepted, 30th July, 1892
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Compound and Insulated
Wires.
I, FRIEDRICH BIDTEL, of Mariahilfer Strasse 37 Vienna in the Austrian
Empire, Factory Director, 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 :-
This invention relates to the manufacture of wire (which I have termed "Yella
wire") which is provided with either a single or manifold sheathing, i.e., the core
which is generally of a cheap material such as iron is sheathed with metal of a
superior quality such as brass or the core is composed of the more expensive
material while the single or manifold sheathing may be of the cheaper material. It
will be evident however that other kinds of suitable materials may be used in place
of those above mentioned.
This object could be attained by coating a rod of one material with a
correspondingly thick layer of another material for instance by casting metal
around said rod, by sliding a tube over same or depositing metal on the same by a
galvanic process, and then rolling or drawing the so sheathed rod to the desired
dimensions.
As however by using this method thin wires cannot be drawn cold or can only be
made at the expense of the quality or uniformity and also in consequence of the
varying ductility of the different kinds of material at the expense of the continuity
of the core and furthermore the drawing or rolling of wire sheathed with tubing or
galvanic coating cannot be generally considered novel no claim is made to the
same. In carrying out my invention I proceed as follows:-
1
I take separately a core and a sheathing and combine these in a draw plate or
rolling train, so that they become practically a uniform mass, the sheathing which
consists preferably of a metallic or other strip or strips, being drawn or rolled in
one or more layers over the core, the result being that it is possible to produce wire
of extreme degrees of fineness.
To clearly explain my invention reference is made to the accompanying drawing
in which
Fig. 1. is a view showing the core and a single strip of sheathing being drawn
through a draw plate by gripping tongs, the draw plate being shown in section.
Fig. 2. is another view of same with the tongs omitted while
Figs. 3 and 4 are respectively views of the opposite faces of the draw plate.
In these figures a is the core b the sheathing strip, c the draw plate in which is a
tapered opening d while e are the jaw portions of the gripping tongs.
In carrying out the process the strip of metal bis drawn cold through the tapered
opening d together with the core a so that the latter is perfectly surrounded, the
edges of the strips being brought together during the drawing.
It is sufficient in commencing the operation that the brass or other strips be
attached so intimately to the iron wire that the whole can be gripped by the tongs
or apparatus. As however brass strips of the requisite exact breadth are difficult
to produce and expensive, I preferably make the same from thick brass wire by
rolling drawing or pressing the same into flat strips.
If during this operation the edges of the so prepared strips are sharp or bevelled
the same can in the subsequent drawing or rolling process be so arranged that the
edges overlap instead of coming together although in most instances the latter is
sufficient.
The "Yella wire" produced in this manner offers the further advantage that in
consequence of the sheathing being open for the entire length, the wire can be

page_text: rolled or drawn down from about ths of an inch to the fraction of a sixteenth of an
inch without breaking the continuity of the core and without breaking or scaling
the sheathing.
The sheathing of the wire core in the afore described manner gives a sufficiently
firm connection between the core and the sheathing to answer all practical require-
ments. In many instances it is however of advantage to connect the core and
sheathing with a kind of soldering in such manner that either the core or the
sheathing or both are coated with solder (tin solder) a soldering fluid or the like
being so applied that the core is soldered to the sheathing.
The afore described process is admirably suited for providing wires with a non-
metallic sheathing for instance with insulating material which can, as with the
metallic sheathing, be used in small strips, the same being further adapted for
providing insulated wire with a metallic sheathing so that a new kind of cable
which I call "Yella cable" is produced.
The process can be interrupted in any stage of the drawing and the continuity
of the core broken at will.
i
Having now particularly described and ascertained the nature of my said inveu-
tion and the manner in which the same is to be performed, I declare that what I
claim is :-
The process of manufacturing wires consisting of a core and one or more metallic
or non metallic laterally open sheaths which are rolled or drawn onto the wire
(called "Yella wire") substantially characterised thereby that the wire forming
the core, is, by means of a correspondingly widened draw iron or a rolling train
providing with one or more sheathings, the longitudinal edges of which approach
each other or gear over each other and composed either of correspondingly broad
metallic strips, or of wire which is rolled, drawn or pressed to flat strips or of
insulating or other material combined with the insulating material, substantially as
described in the foregoing Specification.
Dated this 24th day of February 1892.
PHILIP
FAILIT M. JUSTICE,
Filing Agent.