Improvements in or connected with Electric Cables or Conductors.
Year: 1895

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c., Act, 1883), as required by
the decision of the Chief Examiner of the 3rd day of December 1896.
Date of Application, 29th Aug., 1895
Complete Specification Left, 29th May, 1896-4ccepted. 4th July, 1496
PROVIDIUND
Improvements in or connected with Electric Cables or Conductors.
I, HENRY EDMUNDS, of 39 Victoria Street, in the City of Westminster,
Electrical Engineer, do hereby declare the nature of this invention to be as
follows:-
The object of my invention is to obtain electric cables or conductors, which
whilst being light are efficiently protected against the penetration of moisture or
matter liable to injure the cables or conductors, or their insulation, the cables or
conductors thus made being especially adapted for certain soils which are liable
to injure lead coverings, or armourings and for overhead cables, or in other
situations where it is necessary, or desirable, that the cables should be as light as
possible.
.In
According to my invention I provide the cables, insulated in any desired way,
with a cover, or sheathing, or protection, of india rubber, or material which has
such of the properties of india rubber as will fit it for the purposes of my
invention, the said rubber, or the like, being applied by winding or coiling over
the insulated conductors a strip or strips of rubber, or the like or by otherwise
applying in any suitable position relatively to the conductors a tube sheath or
sheath of india rubber or the like, to the said insulated conductors, for instance,
by applying the rubber or the like by what is known as a squirting process.
cases where the material used for the insulation of the conductors is of such a
character as to cause injury to the rubber, or the like, I interpose between the
insulating material and the rubber or the like non-absorbent paper, or other
material, which will shield the rubber, or the like, from the said insulating
material. The rubber should be vulcanized, and this may be done, for example,
by first applying the unvulcanized rubber and then subjecting the said rubber to
a vulcanizing process, which may be the ordinary process of vulcanization; or, in
order to obviate the use of steam, I inay effect the vulcanization by applying the
necessary heat by means of a bath of oils, or resins, or mixtures thereof, the layer
of non-absorbent paper, or equivalent material, when used between the insulation
of the conductors and the rubber preventing the oils, or resins, or oils, and
resins of the bath from causing any injurious penetration of the rubber whilst the
vulcanization is proceeding.
As before stated I do not limit myself to any one particular manner in which
the coating, covering, or sheathing of rubber, or the like, is applied but I believe
the most convenient way is to wind strips of unvulcanized rubber or the like,

page_text: spirally around the insulated conductor and then subject the conductor, thus
covered, or enclosed, to pressure between rollers, or otherwise, so as to consolidate
the rubber, or the like, and cause it to become, in effect, a continuous tubular
covering, or sheath. If desired I may apply outside the rubber a protective
covering of any suitable material such as tapes wound spirally around the covered
cable and treated with any suitable protective compound.
Dated this 20th day of August 1805
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
Improvements in or connected with Electric Cables or Conductors.
1, HENRY EDMUNDS of 39 Victoria Street in the City of Westminster,
Electrical 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 object of my invention is to obtain electric cables, or conductors, which
whilst being light, are efficiently protected against the penetration of moisture, or
matter liable to injure the cables, or conductors, or their insulation, the cables, or
conductors, thus made being especially adapted for certain soils which are liable
to injure lead coverings, or armourings, and for overhead cables, or in other
situations where it is necessary, or desirable, that the cables should be as light as
possible, insulating material of an economical description being capable of being
employed as although such insulating material is itself penetrable by water the
method of protection according to my invention effectually prevents access of
moisture.
According to my invention I provide the cables, insulated with the insulating
material in any desired way, with a cover, or sheathing, or protection of india-
rubber, or material, which has such of the properties of india-rubber as will fit it
for the purposes of my invention, the said rubber, or the like, being applied by
winding, or coiling, over the insulated conductors a strip, or strips, of rubber, or the
like, or by otherwise applying, in any suitable position relatively to the conductors,
a tube or sheath of india-rubber, or the like, to the said insulated conductors; for
instance by applying the rubber, or the like, by what is known as a squirting
process. The insulating material employed for covering or enclosing the wires
being penetrable by water and the india-rubber being impenetrable by water the
latter affords a protection against the access of moisture to the conductors. In
cases where the material used for the insulation of the conductors is of such a
character as to cause injury to the rubber, or the like, I interpose between the
insulating material and the rubber, or the like, non-absorbent paper, or other
material which will shield the rubber, or the like, from the said insulating
material. The rubber should be vulcanized and this may be done for example by
first applying the unvulcanized rubber and then subjecting the said rubber to a
vulcanizing process, which may be the ordinary process of vulcanization; or in
order to obviate the use of steam I may effect the vulcanization by applying the
necessary heat by means of a bath of oils or resins or mixtures thereof such for
example as resin oils or oxidized mineral oil. A protective cover of non-
absorbent paper or equivalent material may be employed for preventing the
bath from causing any injurious action on the rubber whilst the vulcanization is
proceeding.
As before stated I do not limit myself to any one particular manner in which

page_text: the coating, covering, or sheathing, of rubber, or the like, is applied over the
insulation penetrable by moisture so as to prevent moisture penetrating but,
I believe, the most convenient way is to wind strips of unvulcanized rubber, or
the like, spirally around the insulated conductor and then subject the conductor,
thus covered, or enclosed, to pressure between rollers, or otherwise, so as to
consolidate the rubber, or the like, and cause it to become, in effect, a continuous
tubular covering, or sheath. If desired I may apply outside the rubber a
protective covering of any suitable material such as tapes wound spirally around
the covered cable (or braiding or both combined) and treated with any suitable
protective compound.
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:
1. In the manufacture and production of electric cables, or conductors, in which
the insulation is effected by a material penetrable by moisture, a covering,
sheathing, or protection, of india-rubber, or the like, applied by winding or coiling
a strip or strips thereof over the said insulation; substantially as herein before
explained.
2. In electric cables, or conductors, as claimed by the preceding claiming clause
the combination of a covering of non-absorbent paper, or the like between
insulation, liable to injure india-rubber or the like and the covering, sheathing,
or protection, of india-rubber, or the like; substantially as herein before explained.
3. In the manufacture and production of electric cables, or conductors, insulating
and protecting them by a material penetrable by moisture, applying a covering
sheathing or protection of india rubber or the like over the said insulation and
then vulcanizing the india-rubber protective covering; all substantially as herein-
before described.
4. The production of insulated and protected electric cables, or conductors;
substantially as herein before described.
T: 20th dow of May 1896
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.