Improvements in Electric Transformers and Dynamo Armatures.
Year: 1895

page_text: Date of Application, 29th Aug., 1895
Complete Specification Left, 29th May, 1896-Accepted, 4th July, 1896
PROVISIONAL SPECIFICATION.
Improvements in Electric Transformers and Dynamo Armatures.
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:-
My invention has for its object to produce electric transformers and dynamo-
armatures which have a very perfect insulation of the conductors and yet such
proximity of the same as is desirable in such apparatus.
According to my invention the wires or strips constituting the conductors or
windings have applied to them a substance such as fibrous material, rubber or the
like but preferably cotton, or like material which will maintain the conductors at the
desired distance apart but will allow the penetration of the material of the bath
hereinafter mentioned. The coil, or coils having been wound, on the bobbin, or
support the whole is introduced into a bath of heated insulating compound, or oil
or resin, or mixtures thereof, and by this the moisture and air are expelled and the
heated insulating material penetrates and fills up all pores, or spaces, and after cooling
the coil, or coils, is, or are by this means sheathed in an envelope of insulating
material which is very effective. In cases where two or more coils are used such as
in electric transformers, the coils are separated from each other to the necessary
extent by means of a layer, or layers of an absorbent or porous material or material
which is of such a character as will allow of or not interfere with the penetration of
the insulating material of the bath as aforesaid.
Dated this 29th day of August 1895.
•
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C.
COME LEIE DIECIFICATION.
Improvements in Electric Transformers and Dynamo Armatures.
I, 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 :-
My invention has for its object to produce electric transformers and dynamo
armatures which have a very perfect insulation of the conductors and yet such
proximity of the same as is desirable in such apparatus.
According to my invention the wires, or strips, constituting the conductors, or
windings, have applied to them a substance such as fibrous material, rubber, or the
like, but preferably cotton, or like material, which will maintain the conductors at the
desired distance apart but will allow the penetration of the material of the bath
hereinafter mentioned. The coil, or coils, having been wound, on the bobbin, or
support, the whole is introduced into a bath of heated insulating compound, or oil, or
resin, or mixtures thereof, and by this the moisture and air are expelled, and the
heated insulating material penetrates and fills up all pores, or spaces, and, after
cooling, the coil, or coils, is or are by this means sheathed in an envelope of
Price 8d1

page_text: insulating material which is very effective. In cases where two, or more, coils are
used, such as in electric transformers, the coils are separated from each other to the
necessary extent by means of a layer, or layers, of an absorbent or porous material,
or material which is of such a character as will allow of, or not interfere with, the
penetration of the insulating material of the bath as aforesaid.
Or the said layer or layers may consist of sheets of a material which is impenetrable
by the insulating material of the bath (such as india rubber) so that the said
insulating material seals up the joints.
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 :-
In the manufacture of electric transformers or dynamo armatures the application to
the conductors of a material as aforesaid which will maintain them at the desired
distance apart and then winding the conductors so prepared on the bobbin or
support and introducing the whole into a bath of insulating material substantially
as, and for the purpose, herein before described.
Dated this 29th day of May 1896
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.