Improvements in the Manufacture or Production of an Insulating Material, and the application thereof to the Insulation of Electrical Conductors.
Year: 1897

page_text: Date of Application, 15th June, 1897
Complete Specification Left, 2nd Mar., 1898-Accepted, 23rd Apr., 1898
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture or Production of an Insulating
Material, and the application thereof to the Insulation of
Electrical Conductors.
I, HENRY EDMUNDS, of 39, Victoria Street, in the City of Westminster,
Electrical Engineer, do hereby declare the nature of my invention to be as
follows:-
My invention has for its object to produce an improved material for insulating
electric conductors and the application of such material to such conductors.
According to my invention I apply to paper, or other fibrous material, an
envelope, or covering, of rubber or other moisture proof gum, or vulcanized rubber
or gum, in such a manner that the said rubber or gum does not impregnate the
paper or fibrous material and consequently does not obstruct the air spaces which
are in the substance of the paper, or other fibrous material. This I effect by
applying to the paper, or other fibrous material, in the form of strips, a solution
of the rubber or gum, of such a density that it will not permeate the paper, or
other fibrous material, but will effect a complete envelopement thereof so that it
will preserve the air spaces which are included in the substance of the paper, or
other fibrous material, and prevent the entrance of moisture from the exterior
to the conductors to which the insulation is applied. The solvent may be
evaporated in the usual way so that the paper or other material is covered on
both sides with a homogeneous sheathing or coating of the rubber or gum. The
solution may be applied in any convenient way or the rubber or gum in strips or
sheets of suitable thickness may be rolled on both sides of the paper or other
fibrous material. The strips of paper, or other fibrous material, thus prepared,
may be wound upon, or otherwise applied to, the conductors in any suitable way,
and the impermeable character of the whole may be insured either by winding
the strips spirally around the conductors so that the laps of the strips partly
overlie each other whilst the rubber or gum is in a sufficiently plastic, or tacky,
condition to adhere, or the lappings may, after application to the conductors, be
coated with a solution of rubber, or vulcanized rubber (or both plans may be
combined) and the whole may be vulcanized together or united by heat, in case
rubber or other water-proof gum without sulphur has been used to cover the
paper, or other fibrous material.
100%
JOHNSONS & WILLCOX,
47, Lincolns Inn Fields, London, W.C.,
Agents.

page_text: Improvements in the Manufacture or Production of an Insulating
Material, and the application thereof to the Insulation of
Electrical Conductors.
I, HENRY EDMUNDS, of 39, Victoria Street, in the City of Westminster,
Electrical Engineer, do hereby declare the nature of my invention and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
My invention has for its object to produce an improved material for insulating
electric conductors, and to produce improved insulated electric conductors by the
application of such material to the conductors.
According to my invention I apply to paper, or other fibrous material, an
envelope, or covering, of rubber or of vulcanized rubber, or gum, or other
moisture-proof gum, such for example as vulcanized gutta-percha, in such manner
that the said rubber, or gum, does not impregnate the paper, or other fibrous
material, and consequently does not obstruct the air spaces which are in the
substance of the paper, or other fibrous material.
This I effect by applying to strips of paper, or other fibrous material, a solution
of rubber, or gum, of such a density that it will not permeate the paper, or other
fibrous material, but will effect a complete envelopement, or coating thereof, so
that it will preserve the air spaces which are included in the substance of the
paper, or other fibrous material, and enclose, or cover, them, so as to protect
them from external influences, and effectually prevent the entrance of moisture
to the conductors when the insulating material is applied to them. The solvent
used to dissolve the rubber or gum, may be evaporated in the usual way, so that
the paper, or other fibrous material, is left covered on both sides, or all over its
surfaces, with a homogeneous sheathing, or covering, of the rubber, or gum. The
solution of rubber, or gum, may be applied in any convenient way, or the rubber,
or gum, in the form of strips or sheets, of suitable thickness, may be rolled onto
both sides of the paper, or other fibrous material.
The strips of paper, or other fibrous material, thus prepared, may be wound
upon, or otherwise applied to, the conductors, in any suitable way and the
impermeable character of the whole may be insured either by winding the strips
spirally around the conductors, so that the laps of the strips partly overlie each
other, whilst the rubber, or gum, is in a sufficiently plastic, or tacky, condition
to adhere to the rubber, or gum, of the lap next it or the lappings may, after
application to the conductors, be coated with a solution of rubber, or vulcanized
rubber, or other waterproof gum, (or both plans may be combined), and the
whole may be vulcanized together, or united by heat, in case rubber, or other
waterproof gum, without sulphur has been used to cover the paper, or other
fibrous material. The gums which may be employed are such as are waterproof
and resistant to atmospheric influences and sufficiently pliable not to crack when
deflected to the extent necessary with electric conductors.
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. An insulating material made of paper, or other fibrous material, to which
is annlied an envelope or covering of mihher or vulcanized mibher Or other

page_text: moisture-proof gum, in such a manner that it does not enter the pores, or inter-
stices, in the paper, or other fibrous material; substantially as hereinbefore
described.
2. An insulated electric conductor, the insulating material of which has been
prepared in accordance with the preceding claiming clause, and applied in either
of the manners substantially as hereinbefore described.
Dated this 2nd dow of March 1898
JOHNSONS & WILLCOX,
47, Lincolns Inn Fields, London, W.C.,
Agents.