Improvements in Insulated Electrical Conductors or Cables.
Year: 1899

page_text: Date of Application, 27th July, 1899
Complete Specification Left. 25th Ann 1900 Accepted 21st July, 1900
PROVISIONAL SPECIFICATION,
Improvements in Insulated Electrical Conductors or Cables.
I, HENRY EDMUNDS, of 2, Queen Anne's Gate, in the City of Westminster,
Electrical Engineer, do hereby declare the nature of this invention to be as
follows:-
In insulated electrical conductors or cables in which paper has hitherto been.
employed for insulating the conductors, oil has been used to treat the paper and
it has been necessary to sheath the insulated conductor or cable with a lead, or
equivalent, sheathing. This is expensive and the resulting insulated con-
ductor, or cable, is heavy, and the insulation is liable to be injured should the
sheathing become perforated owing to the escape of the oil and the absorption
of moisture.
The object of my invention is to provide insulated electrical conductors, or
cables, which are economically made, and of comparatively small weight, and
in which the insulation is not liable to become readily injured. According to
my invention I employ, as the foundation of the insulation, paper treated by
saturating it with a mixture of resinous matter and oxidized oils of a sealing and
waterproof character. The paper for the insulation is in the form of strips
which is steeped in a bath of the resinous matter and oxidized oils rendered fluid
by the application of heat. The paper is allowed to remain in this bath until
it becomes thoroughly impregnated with the mixture of resinous matter and
oxidized oils, and, after it is withdrawn from the bath, it is wound spirally upon
the conductor, it taking with it sufficient of the mixture to form a layer between
the folds of the saturated paper and between the conductor and the paper, and
also outside the paper and the insulation thus applied is allowed to cool. I
prefer to employ also strips of paper saturated with an oily matter or lubricant
which is free from moisture and of good insulating qualities the paper strips
thus prepared being wound on the conductor alternately with the paper prepared
as herein before described, any suitable number of lappings being employed.
The whole is then preferably covered with a braiding, or lapping, of a material
such as jute, or cotton, and passed througli a hot bath of a mixture which may
be similar to that used for treating the paper strips as herein-first described.
suitable mixture or compound for the purpose is that known in the trade as
"diatrine." The insulated conductors, or cables, thus produced are very flexible
and the paper is not liable to be strained, or broken, on bending, and the oily
matter, or lubricant, of the paper strips treated therewith is retained very
effectually by the sealing and waterproof mixture with which the other strips
are treated as aforesaid.
A
1
1000
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.

page_text: Improvements in Insulated Electrical Conductors or Cables.
I, HENRY EDMUNDS, of 2, Queen Anne's Gate, 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:-
-
In insulated electrical conductors, or cables, in which paper is employed for
insulating the conductors, oil has been used to treat the paper, and the insulated,
conductor, or cable, has been sheathed with a lead, or equivalent sheathing. In
such insulated conductors or cables should the sheathing become perforated the
insulation is liable to be injured owing to the escape of the oil and the absorption
of moisture.
The object of my invention is to provide insulated electrical conductors, or
cables which are economically made, and which may be of comparatively small
weight and in which the insulation is not liable to become readily injured.
According to my invention I employ as the foundation of the insulation, paper
treated by saturating it with a mixture of resinous matter (such for example as
colophony) seventy-three parts and oxidized oils of a sealing and waterproof
character (such for example as blown oils-vegetable or fish-) twenty-seven
parts and I combine therewith paper saturated with an oily matter, or treated
with a lubricant as hereinafter explained. As a suitable oily matter I may use
for instance heavy mineral-oil, either alone, or in admixture with vegetable or
mineral wax. The paper may be saturated with the sealing and waterproofing
matter by steeping the paper in, or passing it slowly through, a bath of the
said resinous matter and oxidized oils, rendered fluid by the application of heat,
the said paper being passed through the bath at such a slow rate, or allowed to
remain in the bath sufficiently long, to become thoroughly impregnated with
the mixture of resinous matter and oxidized oils. The paper can be saturated
with the oily matter, or lubricant, in a similar manner. The said oily matter,
or lubricant, should be free from moisture and of good insulating qualities.
Strips of paper thus prepared are wound spirally on the conductor, or cable,
alternately with strips of paper prepared with a sealing and waterproofing
material as herein before described, any suitable number of lappings being
employed in accordance with the degree of insulation required. Either the
paper saturated with the sealing and waterproofing material, or the paper satu-
rated with the oily matter, or lubricant may be placed next the conductor, or
conductors but it is preferred that the outer layer should be made by paper satu-
rated with the sealing and waterproofing material. The whole may then be
covered, if desired, with a braiding, or lapping, of a material such as jute, or
cotton, and be passed through a hot bath of a mixture of sealing and water-
proofing character, which may be similar to that used for treating the paper as
herein first described, but this braiding or lapping is not essential. A suitable
mixture, or compound, for the purpose is that known in the trade as diatrine."
The insulated conductors or cables, thus produced are very flexible and the
insulation is not liable to be strained, or broken, on bending; and the oily
matter, or lubricant of the paper strips treated therewith. is retained very
effectually by the sealing and waterproofing material with which the other strips
are treated as aforesaid, the strips treated with oil, or lubricant, allowing of
the conductors or cables being bent without the insulation being injured. If
desired the insulated conductors, or cables, wound with the compound insula-
tion as aforesaid, can have applied to them a lead, or other, sheathing, but this,
if used may be much lighter than is generally employed.
66

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is
An electrical conductor, or cable, having applied thereto paper saturated with
a mixture of resinous matter and oxidized oils of a sealing, or waterproof, char-
acter, alternating with paper saturated with an oily matter, or treated with a
lubricant; substantially as hereinbefore described.
Dated th 5th
A 1000
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.