An Improved Form of Alternating Current Transformer.
Year: 1898

page_text: Complete Specification Left, 13th June, 1899-Accepted, 12th Aug., 1899
PROVISIONAL SPECIFICATION.
An Improved Form of Alternating Current Transformer.
VERITYS LTD., Electrical Engineers, of Plume Works, Aston, in the County
of Warwick, and LOUIS JOIN STEELE, Electrical Engineer, of 14, Clarendon Road,
Holland Park, London, W., do hereby declare the nature of this invention to
be as follows:-
The transformer or "economy coil" according to our invention makes use of
a single continuous winding, to in which tappings are made at one or more parts
in such a manner that one or more arc lamps or other pieces of electrical apparatus
requiring a lower voltage than that of the supply, may be run from an ordinary
alternating electrical supply circuit with a greater economy of current than is
obtainable by the use of the ordinary arrangement of resistance of choking coil
connected in series with the lamp or lamps. The windings are so arranged as
to produce as low a drop in voltage as possible at the lamp terminals when the
lamp.or lamps are in circuit. Our invention is characterized mainly by the
general construction of the transformer in combination with its case. The
laminated cores and yokes are held in position by means of end pieces and tie
rods or bolts, the end pieces being also arranged to receive a terminal slab or
board; an outer protecting case also fitting into or over one or more overlapping
grooves, lips or recesses, in the top piece so designed as to prevent the entry of
moisture or dirt into the transformer and formed in such a manner as to be fixed
to the terminal board and one of the end pieces. To the above-mentioned
board are fixed the terminals for connecting the lamps and mains to the trans-
former, and if necessary a switch for connecting and disconnecting the trans-
former winding to or from the supply circuit.
An Improved Form of Alternating Current Transformer.
We, VERITYS LIMITED, Electrical Engineers, of Plume Works, Aston, in the
County of Warwick, and LOUIS JOHN STEELE, Electrical Engineer, of 14, Clarendon
[Price 81

page_text: Road, Hollond Park, London, W., 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:-
-
This invention refers to alternating current transformers or converters for
electrical distribution, and has for its object an improved form or construction
of transformer in which the main features are, firstly, that the detachable parts
constituting the laminated cores or yokes are held in position by specially con-
structed end pieces (top and bottom) strung together upon tie rods or bolts,
which latter draw the said end pieces together and exert a clamping and confining
action upon the said cores or yokes, secondly, that the said end pieces have pro-
vision upon them for the easy attachment of a terminal slab or board, and, thirdly,
that the protecting casing of the transformer is so fitted to the end pieces and
terminal slab as to exclude moisture and dirt when the instrument is fixed in
an exposed position as is frequently the case. The coil made use of in the trans-
former according to this invention is preferably one of a single continuous wind-
ing, in which tappings are made at one or more parts in such a manner
that any number of arc lamps or similar electrical apparatuses requiring a lower
voltage than that of the supply may be run from an ordinary alternating electrical
supply circuit without connecting its series with the lamps or apparatus a resis-
tance or choking coil, although the invention is also applicable to induction coils
of transformers of more than one winding.
A transformer constructed according to this invention is shown in the annexed
sheet of drawings in Figs. 1, 2, and 3 which are respectively a front, side, and
end elevation (part section) of the instrument complete, and will be described
hereinafter in connection therewith.
In the said figs. a are the laminated cores, arranged parallel, and a² the
laminated yokes abutting and coupling their ends, whilst a³ is the continuously
wound coil. These cores and yokes are loose parts clamped together by end
pieces c and d and tie rods e, which latter connect the said end pieces by passing
through them and by being fitted with screw nuts. The top end piece c, which
is preferably a casting, is formed upon its inner face with a boundary groove or
recess within which fits the one end g² of a thin metal casting, g, which
encloses the whole of the parts of the transformer, and which extends around
from the one edge m² to the other edge m³ of a terminal slab or board m, attached
to the end-pieces by its top edge m fitting within a sinking in the inner face
of the top end piece and its lower end m³ resting upon a flange d² horizontally
formed upon the bottom end-piece d. The lower end g of the protecting outer
casing is connected to the bottom end-piece d by screw pins such as g, so
that the whole of the interior parts of the transformer are well protected, especially
at the top part from which rain would trickle down the sides of the protecting
casing.
To the slab or board m terminals such as o can be attached, by which the
necessary electrical connections between the lamps or other apparatus, the mains,
and the transformer can be made, and to which a switch can if needed be applied
for connecting and disconnecting the transformer to and from the supply circuit.
Lugs are formed to extend from the top side of the top end piece c for the
transformer's attachment to its support.
From the drawings it will be obvious how simple the transformer is built up,
and also how effectively the cores and yokes are clamped together and the interior
of the transformer made weather-proof, and yet this latter so as to enable easy
access to the interior should anything be amiss.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is: -
First. An alternating current transformer characterised by a combination of
end pieces (ton and bottom) one having a
in 24

page_text: upon screw-up tie-rods, laminated cores and yokes formed of loose parts which are
held together by the clamping action of the said end pieces, and an outer pro-
tecting casing fixed between the end pieces inside (in the groove or recess) and
outside at top and bottom respectively, substantially as set forth.
Second. In an alternating current transformer having its coil formed of a
continuous single winding as described, fixing the cores or yokes in position and
attaching the terminal slab or board and a protecting casing by end pieces and
tie-rods, in the manner substantially as set forth.
Third. An alternating current transformer constructed, arranged and fitted
in the manner set forth.
W. P. THOMPSON & Co.,
11, Burlington Chambers, New Street, Birmingham,
Also of Liverpool, London and Manchester,
Patent Agents for the Applicants.