Improvements in the Manufacture of Electric Cables.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Electric Cables.
I, ARNOLD FRANÇOIS BOREL, of Cortaillod in the Republic of Switzerland,
Engineer, do hereby declare the nature of this invention to be as follows:-
The invention relates to certain new and useful improvements in and relating
to the manufacture of electric cables formed of one or more conductors, a metallic
coating and an insulating material separating those two parts from one another.
The manufacture of such electric cables has heretofore been effected by at least
three operations: the conductors were reduced to the desired diameter then such
reduced conductors were recovered by means of an insulating coating of any
suitable material and then a third operation consisted in providing a tubular
metallic coating over such insulating material.
My improved cable is manufactured by means of a much simplified method
which will be hereinafter described.
I first provided a tube of rather small length but relatively large diameter
and thick walls, made of a malleable metal liable to be stretched or rolled by.
means of a rolling-mill, or draw-plate (iron, steel, copper or other suitable metal)
the said tube being intended to form the external coating of the cable to be
manufactured.
Into the aforesaid metallic tube I then place in the geometrical axis of the same
(in case of manufacturing a cable with only one conductor) a cylindrical rod of
suitable diameter and of the same length as the aforesaid metallic tube, made of
copper or other suitable metal intended to form the electric conductor.
Finally I fill up the whole space between the said cylindrical rod and the
metallic tube with powdered glass, asbestos or other similar insulating material
adapted to withstand high temperatures.
The ingot thus formed is then heated to the suitable degree of heat for the
purpose of rendering the external coating of metal soft enough to be rolled or
stretched by means of a rolling-mill or draw-plate until it has been reduced to the
desired diameter for the electric cable.
The cylindrical rod intended to form the electric conductor as described above
may be replaced by two three or more rods, placed parallel to and at some
distance from one another so as to form a cable with several conductors. Those
cables are especially intended to be executed in small dimensions for instance for
in-door electric circuits.

page_text: Improvements in the Manufacture of Electric Cables.
I, ARNOLD FRANÇOIS BOREL of Cortaillod in the Republic of Switzerland,
Engineer, 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 invention relates to certain new and useful improvements in and relating
to the manufacture of electric cables formed of one or more conductors, a metallic
coating and an insulating material separating those two parts from one another.
The manufacture of such electric cables has heretofore been effected by at least
three operations: the conductors were reduced to the desired diameter then such
reduced conductors were recovered by means of an insulating coating of any
suitable material and then a third operation consisted in providing a tubular
metallic coating over such insulating material.
i
My improved cable is manufactured by means of a much simplified method which
will be hereinafter described.
I first provided a tube of rather small length but of relatively large diameter
and thick walls, made of a malleable metal liable to be stretched or rolled by
means of a rolling-mill, or draw-plate (iron, steel, copper or other suitable metal)
the said tube being intended to form the external coating of the cable to be
manufactured.
Into the aforesaid metallic tube I then place in the geometrical axis of the same
(in case of manufacturing a cable with only one conductor) a cylindrical rod of
suitable diameter and of the same length as the aforesaid metallic tube, made of
copper or other suitable metal intended to form the electric conductor.
Finally I fill up the whole space between the said cylindrical rod and the
metallic tube with powdered glass, asbestos or other similar insulating material
adapted to withstand high temperatures.
The ingot thus formed is then heated to the suitable degree of heat for the
purpose of rendering the external coating of metal soft enough to be rolled or
stretched by means of a rolling-mill or draw-plate until it has been reduced to the
desired diameter for the electric cable.
The cylindrical rod intended to form the electric conductor as described above
may be replaced by two three or more rods, placed parallel to and at some distance
from one another so as to form a cable with several conductors. Those cables are
especially intended to be made in small sizes for instance for indoor electric
circuits.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The method or process of manufacturing electric cables with one or more
conductors substantially as described and consisting in first combining a tube of
any suitable ductile metal and a rod of ductile metal placed substantially in or
parallel to the geometrical axis of said tube, with powdered glass, asbestos or other
non-conducting material adapted to withstand high temperatures and then reducing
the ingot thus formed by rolling or stretching the same by means of a suitable
rolling-mill or draw-plate.
1000
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.