IMPROVEMENTS IN DYNAMO ELECTRICAL MACHINES
Year: 1882

page_text: LETTERS PATENT to the Honorable Reginald Brougham of Heddon Street
Regent Street in the County of Middlesex. for an invention of "IMPROVEMENTS
LETTERS PATENT to the Honorable Reginald Brougham of Heddon Street
Regent Street in the County of Middlesex. for an invention of "IMPROVEMENTS
IN DYNAMO ELECTRICAL MACHINES
PROVISIONAL SPECIFICATION left by the said Reginald Brougham at the
Office of the Commissioners of Patents on the 29th April 1882.
The Honorable REGINALD BROUGHAM of Heddon Street Regent Street in the
County of Middlesex "IMPROVEMENTS IN DYNAMO ELECTRICAL MACHINES
This invention has for its object improvements in dynamo electrical machines
and the improvements relate to that class of continuous current dynamo electrical
machines in which a cylindrical ring of iron (embraced by a series of coils of an
insulated copper conductor ranged in planes parallel with the axis of the ring)
is caused to revolve with its circumference in close proximity to the poles of electro
magnets.
Usually as in the well known Gramme machines the cylindrical ring of iron
has been wound with a series of coils of insulated conducting wire each made up
of numerous turns of insulated wire either circular or flattened lying side by side
and one over the other-and the inner end of each coil and the outer end of the
succeeding coil have been coupled by radial strips to insulated metallic bars or
plates ranged lengthwise along the axis by which the cylindrical ring is carried.
The electric current generated has been carried off from these bars by metallic
conductors bearing against the opposite points of the axis.
According to this invention in place of constructing the revolving ring of
continuous current dynamo machines in this manner I form each insulated
conducting coil by which the ring is embraced of a strip of copper of a width
equal to the width of the coil to be formed. The strip before being wound into a
coil around the ring is braided or covered over with strands of cotton or other
fibre or is otherwise insulated.
The end of the strip which is to be
standing out at right angles from it.
around the ring the arm is bent so as
Price G11
at the inner end of each coil has a short arm
When the strip has been wound into a coil
to make it stand out radially from the ring.

page_text: The next coil is then similarly wound on to the ring and the outer end of the strip
of which it is composed is coupled to the arm of the previous coil-preferably the
arm of the previous coil is inserted underneath it.
The outer ends of the coils are made to be at one side of the ring and radial
conducting strips are led from them to the insulated contact bars which are ranged
lengthwise of the axis of the ring as heretofore.
In addition to forming the coils in the manner above described I also bind the
coils tightly to the exterior of the ring by winding an uninsulated iron wire tightly
around the covered ring in coils lying closely side by side around its outer
circumference only. This outer circumferential covering of iron wire serves not
only to bind the coils of insulated copper conductor to the ring but also serves
virtually to bring the coils of insulated copper conductor into closer proximity to
the poles of the magnet than they otherwise could be.
The iron wire coils may if desired be soldered one to the other after they have
been wound around the circumference of the cylindrical ring-afterwards the outer
circumference of the ring is reduced to a perfectly cylindrical form in order that
it may be revolved in close proximity to the poles of the magnets which are shaped
to a correspondingly curved form.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Reginald Brougham in the Great Seal Patent Office on the
28th October 1882.
The Honorable REGINALD BROUGHAM of Heddon Street Regent Street in the
County of Middlesex. "IMPROVEMENTS IN DYNAMO-ELECTRICAL MACHINES."
This Invention has for its object improvements in dynamo electrical machines
and the improvements relate to that class of continuous current dynamo electrical
machines in which a cylindrical ring of iron (embraced by a series of coils of an
insulated copper conductor ranged in planes parallel with the axis of the ring) is
caused to revolve with its circumference in close proximity to the poles of electro
magnets.
Usually as in the well known Gramme machines the cylindrical ring of iron
has been wound with a series of coils of insulated conducting wire each made up
of numerous turns of insulated wire either circular or Hattened lying side by side
and one over the other-and the inner end of each coil and the outer end of the
succeeding coil have been coupled by radial strips to insulated metallic bars or
plates ranged lengthwise along the axis by which the cylindrical ring is carried.
The electric current generated has been carried off from these bars by metallic
conductors bearing against opposite points of the axis.
According to this invention in place of constructing the revolving ring of
continuous current dynamo machines in this manner I form each insulated
conducting coil by which the ring is embraced of a strip of copper of a width equal
to the width of the coil to be formed. The strip before being wound into a coil
around the ring is braided or covered over with strands of cotton or other fibre or
is otherwise insulated.
The end of the strip which is to be at the inner end of each coil has a short arm
standing out at right angles from it. When the strip has been wound into a coil
around the ring the arm is bent so as to make it stand out from the ring. The
next coil is then similarly wound on to the ring and the outer end of the strip of
which it is composed is coupled to the arm of the previous coil.
The outer ends of the coils are made to be at one side of the ring and radial
conducting strips are led from them to the insulated contact bars which are ranged
lengthwise of the axis of the ring as heretofore.
In addition to forming the coils in the manner above described I also bind the
coils tightly to the exterior of the ring by winding an uninsulated iron wire
tightly around the covered ring in coils lying closely side by side around its outer
circumference only, This outer circumferential covering of iron wire serves not
only to bind the coils of insulated copper conductor to the ring but also serves to
virtually bring the coils of insulated copper conductor into closer proximity to the
poles of the magnet than they otherwise could be.
The iron wire coils may if desired be soldered one to the other after they have
been wound around the circumference of the cylindrical ring-afterwards the outer
circumference of the ring is reduced to a perfectly cylindrical form in order that
it may be revolved in close proximity to the poles of the magnets which are shaped
to a correspondingly curved form.
In order that my invention may be fully understood and readily carried into
effect I have shewn in the Drawing hereunto annexed the revolving armature of a
Gramme machine with its several insulated conducting coils formed in the manner
above described. Figure 1 shews one of the ends of the armature. Figure 2 is a
longitudinal section of the armature and Figure 3 the opposite end of the armature
with one half in section. Figure 4 shews a plan view of one end of the conducting
tapes with the copper conductor exposed and a short arm secured to and made to
extend out sidewise from it. Figure 5 a perspective view of the same end bent
preparatory to winding the tape into a coil.
A is the cylindrical iron core of the armature made up of wire in the ordinary

page_text: way. B. B. are the coils of tape with which it is wound before being mounted on
the wheel or axle which is to carry it.
The inside end of the tape from which each coil is formed has the arm C
extending from it at right angles-this end is bent up in the way shewn at
Figure 5. On commencing to wind the coil this bent up end of the tape is held
against one end of the iron core as illustrated by the perspective view Figure 6-
the tape is then wound into a coil as shewn at Figure 7.
The arm C if not previously bent at right angles is now bent at right angles so
as to make it project outwards from the iron core as shewn at Figures 67 and 8.
The next coil is then similarly wound around the iron core close alongside of the
first coil and the outer end of the second coil is bent so as to make it lie alongside
of the end of the arm C of the first coil as illustrated by the perspective view
Figure 8 the two ends are then temporarily clipped together. When all of the
coils have so been wound on to the armature the armature is mounted on to the axle
which is to carry it. The pairs of ends which have previously been clipped
together may now each be secured to a radial conductor D the conductor being
bent over the two ends and secured to them by solder. The radial bars lead to
the several radial contact plates E which are ranged around the axle in the ordinary
manner.
The mounting of the iron core upon the axle may be done in any ordinary way
or as I prefer it may be done in the way shewn by the Drawings but which forms
no part of the invention secured to me under this Patent.
The shaft F is made with a double taper the larger ends of each taper meeting
at the centre. Segments G of a cylinder surround each tapered end preferably
there are six such segments at each end. The segments at one end are connected
to the segments at the other end by bolts H. The bolts pass through radial slots
in a disc which is keyed on to the shaft. By screwing up the nuts on the ends of
the bolts H the segments are drawn towards the centre of the axle and by the
action of the inclines upon them are pressed outwards against wooden staves I
which are placed between the segments and the cylindrical core.
When the cylindrical armature has so been mounted on to its axle it is bound
round externally with iron wire K in coils laid closely side by side around its
circumference. Afterwards the outer circumference is reduced to a perfectly
cylindrical form in order that it may be revolved in close proximity to the magnet
poles.
When moveable segments are interposed between the armature and the axle as
above described the outer circumference of the armature can quickly be brought
to a perfectly cylindrical form by tightening or slacking the nuts on the bolts
which draw the segments together tightening those which require to be tightened
and slackening those which require to be slackened.
Having thus described the nature of my invention and the manner of performing
the same I would have it understood that I claim :-
First. The construction of the several insulated conducting coils of the armature
of a Granime or other like dynamo machine each from an insulated metallic tape
of the same width as the coil substantially as herein before described.
Second. Binding round the exterior circumference of the armature with wire
coiled closely around it substantially as described.
In witness whereof I the said Reginald Brougham have hereunto set my
hand and seal this twenty eighth day of October in the year of our
Lord One thousand eight hundred and eighty two.
REGINALD BROUGHAM (L.S.)