Year: 1887

page_text: Date of Application, 12th Apr., 1887.
: Complete Left, 11th Jan., 1888
Complete Accepted, 24th Feb, 1888
We, HENRY WILLOCK RAVENSHAW, of Bull Green Works, Halifax, Yorkshire,
WALTER THOMAS GOOLDEN, and ALEXANDER PELHAM TROTTER, both of 2 Victoria
Mansions, Westminster, in the county of Middlesex, Electrical Engineers, do hereby
declare the nature of this invention to be as follows:-
7
This invention has for its object the providing of means whereby the whole of the
surface, or area, of the periphery of a drum armature may be utilised for the purpose
of winding while at the same time allowing of the coils being properly secured in
place.
In armatures of the drum type as heretofore constructed the wires have either been
laid in grooves or channels formed along the periphery of the armature or they have
been retained in place by the aid of wooden or other suitable chock pieces, or other
similar devices driven in, or otherwise secured at, intervals along the periphery.
All these devices, however, tend to lessen the peripheral area of the armature
available for winding.
In winding an armature according to this invention the whole, or any desired part,
of the armature's periphery covered by the winding and the respective wires are
retained in place by passing them between suitably formed projecting pieces, cast or
otherwise formed upon, or attached to, the end pieces of the armature.
These projecting pieces are so shaped and spaced apart radially and relatively to
each other and to the axis of the armature as to ensure their coinciding with the
openings left by the intersections of the various coils.
The pieces project a sufficient distance to prevent the coils slipping endwise over
them and if necessary grooves, in which the wires would lie, could be cut in them, or
the outer end of each projection could be so extended circumferentially on each side
that the whole of the extensions together would form a continuous ring, and
each coil or wire would then pass through, or lie in, a separate radial channel
or arch.

page_text: We, HENRY WILLOCK RAVENSHAW, of Bull Green Works, Halifax, Yorkshire,
WALTER THOMAS GOOLDEN, and ALEXANDER PELHAM TROTTER, both of 2 Victoria
Mansions, Westminster, in the County of Middlesex, Electrical Engineers, 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 has for its object the provision of means whereby the whole of the
surface, or area, of the periphery of a drum armature may be utilised for the purpose
of winding while at the same time allowing of the coils being properly secured in
place.
In armatures of the drum type as heretofore constructed the wires have
either been laid in grooves, or channels, formed along the periphery of the armature
or they have been retained in place by the aid of wooden or other suitable chock
pieces, or other similar devices driven in, or otherwise secured at, intervals along the
periphery of the armature.
All these devices, however, tend to lessen the peripheral area of the armature
available for winding.
In winding an armature according to this invention the whole, or any desired
part, of the armature's periphery is covered by the winding and the respective
wires are retained in place by passing them between suitably formed projecting
pieces, cast or otherwise formed upon, or attached to, the end pieces of the
armature.
These projecting pieces are so shaped and spaced apart radially and relatively to each
other and to the axis of the armature as to ensure their coinciding with the openings
left by the intersections of the various coils.
The pieces project a sufficient distance to prevent the coils slipping endwise over
them and if necessary grooves, in which the wires would lie, may be cut in them.
Having thus set forth the nature of our invention and indicated in what manner
the same is to be carried into effect we will now proceed to more particularly
describe the same, reference being made to the accompanying sheet of drawings for
that purpose.
From the drawings, of which Fig. 1 is a sectional elevation of part of the commutator
end of a drum armature, Fig. 2 being a plan of the opposite, or pulley, end of the
same armature, and Fig. 3 views, on an enlarged scale, of the projecting piece, or pin,
that the mounting and core of the armature are of the ordinary construction, A being
the shaft, B one of the "spiders" or mountings and C the core formed of the iron
discs d. d.
At each end of the armature, and outside the iron discs, is placed a disc of
vulcanised fibre, or other suitable material, D, pierced to receive the heads a a of the fibre

page_text: pins or projecting pieces b, b, formed with a flattened shank as shown at c, c,
Figs. 2 and 3.
Outside each of the fibre discs is placed an outer ring E of cast iron or other
suitable material, formed either in one piece or in sections and secured to the armature
in,
n.any
suitable manner.
This ring is pierced, as shown by Fig. 2, with holes through which the shanks e of
the fibre pins project and it may be made either solid in section so that its inner face
comes flush with and bears upon the heads a a of the pins, or it may be formed hollow
as shown the space between it and the fibre disc being filled in with any suitable
substance capable of retaining the pins in place.
As shown on Fig. 1 the wires e, e, after traversing the periphery of the armature,
in any desired manner of winding, have their ends f, f, brought past the pins 1, 2, to
the commutator, where they are secured to their respective sections by any of the
usual methods. At Fig. 2 a typical method of passing the wires round the pulley end
of an armature is shown the pins, or projections, c, c, serving, in this case, to retain
two adjacent wires in place.
It will be understood that in place of using one set of pins, or projections, only, as
shown, two or more sets may be used and that they may either be disposed, in
concentric rings, on the same radii, or, in concentric rings, on alternate radii, or in
such other order as the particular method of winding may necessitate.
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 :
The hereinbefore described method of constructing an armature with end pins, or
projections, for the purpose of retaining the wires in their respective positions on the
periphery of the armature.