Electrical Conductors with Lead or the ДKU
Year: 1887

page_text: Electrical Conductors with Lead or the ДKU,
I, ROBERT WILLIAM EDDISON of Steam Plough Works Leeds in the County of
York, Engineer do hereby declare the nature of this Invention which has been
communicated to me from abroad by Edward McKnight of Philadelphia State of
Pennsylvania in the United States of America, 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 relates to machines or presses of the type described in the Speci-
fication of the Patent No. 11879 of 1885, granted to James Tatham and this said
Invention has for its object to prevent injury to the insulating covering of the
conductor whilst the insulating conductors are being covered with hot lead or other
ductile metal.
I will describe the Invention with reference to the accompanying drawings.
Figure 1 is a transverse section partly in elevation of sufficient of the machine or
press to illustrate this invention.
Figure 2 is an enlarged view of part of the machine or press and Figure 3 a
sectional plan the section being taken on the line 1-2, Figure 2. In Figure 1
A represents part of the hydraulic cylinder of a lead pipe press B part of the plunger
of the same.
D the lead reservoir carried thereby. F the interposed hollow column
with lateral passage a and G the upper fixed ram bolted to the cap H which is secured
to the cylinder A by means of posts or pillars b.
Upon the hollow column F is supported a block J having a central chamber and
opposite lateral passages and into a threaded opening in the bottom of the block is
screwed the die M, the projecting portion of the latter being contained in a recess in

page_text: the column F. There is also a threaded opening in the top of the block J and into
this opening is screwed a hollow core N the upper end of which fits snugly in a
block in the lower end of the hollow ram G.
The core N has a detachable lower end or nose P held in place by a set screw m
(Figure 2) this detachable nose being tapered externally and projecting into the
opening of the die.
The above apparatus was devised for the purpose of covering insulated electrical
conductors with lead or other ductile metal the insulated wire being drawn through
the cap Hram G and hollow core N and out through the lateral opening a of the
column F.
The reservoir being filled with hot lead or other ductile metal the plunger B was
elevated so as to cause said reservoir to rise, the ram G pressing upon the lead in the
reservoir and forcing the same through the die M around the end P of the hollow
core and onto the insulated wire, the latter being drawn through the core by the pipe
as the latter was formed and the sheathed wire being discharged through the lateral
passage of the hollow column.
In practice it was found that when the wire was insulated with rubber or like
material which would be softened or injured by heat, the insulation was rendered
defective, owing to the heat of the hollow core and its nose, through which the insulated
conductor was compelled to pass, the effect of the heat being especially noticeable
upon that portion of the conductor which remained in the core during the time that
the reservoir was being re-charged with hot lead.
In order to overcome this objection the core and its nose are provided with a
lining of asbestos or other non-conducting material, which will serve to protect the
insulated conductor from the injurious influence of the heat to which said core and its
nose are subjected.
The lining of the nose may be independent of that of the upper part of the core,
as shown or the lining may be continuous throughout if desired and the said lining
may be formed by forcing a non-conducting tube of the proper size into the core or
by ramming powdered granular or fibrous non-conducting material into the core and
around a suitable former, which is then withdrawn to form the passage for the
conductor.
The lining should extend as close as possible to the discharge end of the core nose,
it being preferable, however to form an internal shoulder w near the point of the nose
so as to provide a support for the lining.
A perforated pipe y is located beneath the die so as to throw jets of water or a
cooling agent onto the covering of the conductor immediately it issues from the die
and in order to thoroughly cool the said covering before the conductor is wound upon
the reel, the said covered conductor is preferably passed through a water trough
placed between the press and the reel.
The said improved lined core while effectually preventing the destruction or
impairment of the insulating covering of the conductor, is not open to the objection
to a water chambered core, which has a tendency to chill the lead in the reservoir
and then necessitates the use of increased power to force the same through the di..
I do not limit myself to the precise details illustrated for example the lining a may
be situated between the core N and an inner thin metal casing that is there may be a
thin metal casing or tube inside the lining x.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is
1st. In machines or presses of the type herein before mentioned the combination of
the reservoir, ram and die with a hollow core forming a passage for an electrical
conductor and provided with a fixed lining of non-conducting material with or
without a thin metal tube or inner lining inside the said non-conducting material all
substantially as hereinbefore specified.
2nd. The combination of the reservoir ram and die of the press with the hollow

page_text: core and its discharge nose each provided with a non-conducting lining or packing
all substantially as hereinbefore specified.
3rd. The combination of the reservoir ram and die of the press the hollow core
having an internal shoulder near the point and a non-conducting core lining having
a bearing upon said shoulder all substantially as hereinbefore specified and illustrated
in the accompanying drawings.
4th. The combination of the reservoir, ram die and hollow core of the press with a
perforated pipe located adjacent to the die and constructed to discharge streams of
water or cooling medium upon the covering of the conductor as it issues from the die
all substantially as hereinbefore specified and illustrated in the accompanying
drawings.