Improvements in Armatures of Dynamos and Electric Motors.
Year: 1894

page_text: Date of Application, 19th Jan., 1894
Complete Specification Left, 12th July, 1894-Accepted, 25th Aug. 1894
PROVISIONAL SPECIFICATION.
Improvements in Armatures of Dynamos and Electric Motors.
HARRY PENN, Engineer, 40 Harold Road, Upper Norwood, London, S.E.
LOFTUS LOWNDES, Engineer, 25 Lordship Road Stoke Newington London N.
do hereby declare the nature of this invention to be as follows:-
Our invention relates to an improved method of constructing armatures of
dynamo electric machines and electric motors; in which the armature is built up
of sheet iron discs or rings suitably separated from one another, each disc or ring
being corrugated radially: these discs or rings are pressed together by end plates
suitably shaped to fit the corrugations in the discs or rings; the end plates being
keyed or otherwise secured to the shaft and the necessary pressure obtained by
screwed nuts or nuts and bolts.
In addition to the end plates one or more plates shaped to fit the corrugations in
the discs and keyed or feathered to the shaft may be introduced at convenient
intervals.
Dated this 18th day of January 1894.
HARRY PENN.
LOFTUS LOWNDES.
"
COMPLETE SPECIFICATION.
Improvements in Armatures of Dynamos and Electric Motors.
HARRY PENN 40 Harold Road, Upper Norwood, Surrey, Engineer, and LOFTUS
LOWNDES 25 Lordship Road, Stoke Newington, Middlesex, 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:—
This invention relates to an improved method of constructing armatures of
dynamo electric machines and electric motors; in which the armature is built up
of thin sheet iron discs or rings, suitably separated from one another, each disc or
ring being corrugated radially.
These discs are pressed together by end plates, suitably shaped to fit the
corrugations in the discs or rings; the end plates being keyed or otherwise secured
to the shaft.
In addition to the end plates, one or more plates, shaped to fit the corrugations
in the plates, and keyed or feathered to the shaft, may be introduced at convenient
intervals.
In order that our invention may be more fully understood, we have annexed to
this Specification, a sheet of drawings, to the figures and letters of reference on
which, we now refer
--
Fig. I is an elevation of a ring armature, the top half being in section.
Fig. II is an end view of Fig. 1.
Fig. III is a sectional elevation of a drum armature.
Fig. IV is an end view of Fig. 3.
Fig. V is a perspective view of an end plate.
Fig. VI is a perspective view of a disc
A and B are the end plates, keyed or otherwise secured to the shaft D. E is a
sorred nut he means of which the sheet iron dises are clamned between the

page_text: end plates A and B. The flanges of these end plates are concentric with the shaft ;
being cast or otherwise fashioned with corrugations, or alternate projections and
recesses, on their inner faces; the discs being similarly corrugated by means of a
press or other suitable appliance. When screwed together, the corrugations in the
end plates coincide with the corrugations in the discs, keeping the discs concentric
with the shaft, and preventing the one moving without the other.
In long armatures, intermediate plates, corrugated on both faces (as C. Fig. 3),
sliding on feathers in the shaft, may be introduced at convenient intervals, to give
extra support to the discs.
The corrugations are preferably radial to the axis, and curved, as shown in the
figures, but may also be made with straight instead of curved sides.
In large armatures the discs are made up of two or more segments; the number
of corrugations varying with the size of the plate.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed; we hereby state, that we
do not limit ourselves to the precise combinations shown in the figures, for the
better illustration of the description given; but we declare that what we do claim
and desire to secure by Letters Patent is :-
In armatures of dynamos and electric motors, the employment of corrugated
sheet iron discs in combination with corrugated end plates, substantially as
described and illustrated by the accompanying drawings.
Dated this 10th day of July 1894.
HARRY PENN.
LOFTUS LOWNDES.