IMPROVEMENTS IN THE MANUFACTURE OF REVOLVING ARMATURES AND OTHER PARTS OF ELECTRICAL APPARATUS, AND IN MACHINERY THEREFOR
Year: 1881

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for an Invention of
"IMPROVEMENTS IN THE MANUFACTURE OF REVOLVING ARMATURES AND
OTHER PARTS OF ELECTRICAL APPARATUS, AND IN MACHINERY THEREFOR."
A communication from abroad by Charles Dion, of the City and State of New
York, United States of America, Electrician.
PROVISIONAL SPECIFICATION left by the said William Robert Lake at
the Office of the Commissioners of Patents on the 7th September 1881.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN THE MANUFACTURE or
REVOLVING ARMATURES AND OTHER PARTS OF ELECTRICAL APPARATUS, AND IN
MACHINERY THEREFOR." [A communication from abroad by Charles Dion, of the
City and State of New York, United States of America, Electrician.]
This Invention relates chiefly to a novel construction of revolving armature for
electro-dynamic machines, and to a novel process and mechanism for making the
same.
In the accompanying Drawings Figure 1 is a longitudinal sectional view of an
armature made according to my said Invention; Figure 2 is an end view of the
same; Figure 3 is an end view showing the same in process of construction; Figure 4
is a front view of a machine. also included in my said Invention, and designed for
the manufacture of the armature aforesaid; and Figure 5 is a similar view with some
of the parts shewn in Figure 4 removed; Figure 6 is a central vertical sectional view
of said machine; Figure 7 is a detail view on an enlarged scale representing the
conical rolls which form part of the said machine; Figure 8 is a detail view, also
on an enlarged scale, showing a modification of the guide which forms one part of
the said machine; and Figure 9 is a detail view showing the shape of the flat wire
as the same comes from the machine preparatory to being applied to the core of the
armature in the operation of making the latter.

page_text: Having reference first to Figures 1 and 2, A is the core of the armature, which is
made of soft iron. B is the wire, which is flat or ribbon shaped, and which is placed
in parallel coils around the walls of the armature, as represented in Figures 1 and 2
aforesaid, that is to say, the outer portion of each coil of the said wire is placed
edgewise upon the outer surface of the said core, while the inner side of each coil
is arranged edgewise upon the inner surface of the core, passing through the
tubular or hollow interior of the latter, the successive coils being side by side, and
together covering the entire core. The coils are insulated by being coated with
gelatine treated with bichromate of potash, after which the coils thus coated with
said material are exposed to the light, whereby an insoluble film of material having
a sufficiently insulating or non-conducting power is placed upon the wire.
In the formation of the wire preparatory to its application to the core A, as just
described, the said wire is bent so as to properly pass over and around the ends of
the walls of the core, as represented more particularly in Figure 1. Assuming the
wire to be brought to the proper shape, as represented in Figure 9, that is to say,
in coils having a suitable configuration continuous one with another, and placed
side by side, the modus operandi of placing the wire upon the core is as follows,
reference being had to Figure 3-The core itself is divided longitudinally in one
of its sides, for example, as indicated at a in said Figure 3, and the parts are sprung
apart to a distance sufficient to permit the coiled wire to be slipped thereon, and
when a sufficient quantity of the said coiled wire is slipped upon the core A the
two surfaces adjacent to the opening a are brought together and retained in contact
by riveting or by any other suitable means.
In order to form the flat wire into suitable coils preparatory to its application to
the core A, as herein before explained, the said wire is first formed in the shape of
substantially flat ribbon, which is subjected to the operation of the machine repre-
sented in Figures 4, 5, 6, and 7.
This machine has two strong shafts B and C, the ends of which are formed into
substantially bevelled or conical shape, as more clearly represented on the larger
scale, Figure 7, the two shafts B and C being arranged at right angles to each other,
so that the adjacent faces of the conical rolls B, C, are substantially coincident,
but which are placed at a distance apart and in a position with reference to each
other corresponding to the requirements of rolling the wire ribbon into its coiled
form, as herein presently set forth.
It will be observed that, assuming the two shafts B and C to rotate in unison,
the speed of the beveled or conical-surfaces-will-be-greater as they approach the
greater diameter; thus, for example, the relative speed of the moving surfaces will
be greatest at b and very slight at c, the speed of the intermediate parts being pro-
portioned to their distance from the point c. The shaft C is placed vertically in
suitable bearings provided in a yoke D, which is connected by suitable bolts a¹
with the frame E of the apparatus, and which is furthermore provided with a
slot d, through which and into a suitable nut in the frame E passes a broad headed
screw e; this screw e serves as a kind of fulcrum to support the yoke D to enable
the latter to be adjusted to bring the shaft C into the requisite relation with the
shaft B; this adjustment is necessarily comparatively slight, and provision is made
therefor by causing the holes in the yoke D through which pass the bolts a¹ to be
of sufficient size to permit the movement of the adjacent parts of the yoke D with
reference to the said bolts a. By turning the bolts a¹ and also the broad headed
screw e, the yoke D is readily fixed to the frame E. The shaft B in like manner
works in bearings provided on the frame E, but laterally adjustable thereon by
means of the screws f. The shaft B is provided with a suitable drum or pulley by
which it may receive motion from a belt, and is also provided with a beveled gear
wheel F, which gears into a corresponding gear wheel F on the shaft C, so that
simultaneous and equal rotation is given to the shafts B and C, and consequently
to the conical rolls B¹ and C'. The shaft B has also a spur gear-wheel G which
works into a spur gear wheel G' on the shaft g of one of a pair of feed rollers H, H¹,
the said rollers being more fully represented in Figure 4.

page_text: raced between the reed rollers H, H', and the conical rolls B', C, is a guage or
guide K, the said gauge being tubular, and having its interior of a size and shape
proportioned to the cross-section of the ribbon wire to be passed therethrough. A
spring may be provided in the upper part of the bore of this guide K, and the said
spring may be forced downward by a thumb screw e¹ to cause the said spring to
press with greater or less force upon the ribbon as it passes through the said guide.
The guide K itself is provided upon a plate m which is transversely slotted, and
which is placed upon an inclined bed or table n, itself formed upon a bracket L'.
The plate m is attached to the table n by broad headed bolts f¹ which pass
through the slots in the said plate into nuts suitably provided in the table n.
Inasmuch as the table n is slanted or inclined, it follows that by adjusting the
plato m upon the said table n the guide K will be brought into the exact position
required to properly guide the ribbon wire from the rollers H, H', to the conical
rolls B, C. Each of the conical rolls aforesaid has a portion of its surface
chambered or cut away, as represented at r, the recessed or chambered portions
being so arranged as to come together opposite each other at each complete
rotation of the shafts B, C. In like manner the feed rollers H, H¹, have a portion
of their circumference cut away, as shewn at 8. The recessed portions 8 of the two
feed rollers H, H', come opposite to and coincident with each other at each
complete revolution of the said rollers. The wire having the substantially flat
ribboned form hereinbefore referred to is indicated at I in Figure 6.
After the recessed portions 8 of the feed rollers H, H', have passed away from
their coincident position, the more closely adjusted surfaces of the said rollers
H, H', grip the ribbon wire I, and feed the same forward in a substantially straight
direction as the same issues through and from the guide K, the chambered or
recessed portions of the conical rolls B', C¹, being at this stage of the operation
coincident with each other, and thus permitting the ribbon wire to pass forward
without being acted upon by the said conical rolls B, C. It is this forward
feeding in a straight direction of the ribbon wire I that forms the straight portions
represented from v to w in Figure 9 of the coils. When the rollers H, H', bave so
far completed their revolution that the recessed portions 8 are brought opposite
each other and consequently adjacent to the ribbon wire I, it follows that the said
ribbon wire is released from the action of the said rollers, and it is at precisely
this stage of the operation that the chambered or recessed portions of the conical
rolls B, C, pass away from each other, and the larger or working surfaces of the
said conical rolls B', C', becoming coincident grip the wire, and inasmuch as the
said working portions of the said conical surfaces of the rolls B', C³, not only move
with greater speed at their outer portions, that is to say, at the portions adjacent
to the point b, but are placed closer together at such outer portions, it follows that
the outer edge portions of the ribbon wire I are compressed and drawn at a more
rapid rate than the inner portions which lie nearest the point c of the rolls B', C',
aforesaid, from which it follows that that portion of the ribbon wire I acted upon
by this contact of the working conical surfaces of the rolls B', C¹, is turned on the
arc of a circle, as indicated at Figure 6. It is this operation which forms the semi-
circular ends of the coils, as shown in Figure 1, and inasmuch as the operation of
the rollers H, H¹, to feed inward the ribbon wire I without action on the part of
conical rolls B', C', alternate with the action of the last named rolls B₁, C¹, in
drawing the wire between the recessed parts 8 of the rollers H, H', it follows that
the straight longitudinal portions of the coils are formed alternately with the
semi-circular ends thereof. The ribbon wire is thus shaped into a series of parallel
coils, each of which has straight sides and semi-circular ends, the coils lying side
by side, so that the coil being thus provided it is only necessary to coat the saine,
as hereinbefore explained, and then apply it to the core to form the armature, as
herein before explained.
As hereinbefore described, the guide through which the ribbon wire passes to
the conical rolls is constructed with an internal spring, the tension of which is
adjusted by a set screw; but inasmuch as it is desirable that the ribbon wire while

page_text: being fed to form the straight portions of the coils should not meet with any
resisting action from the guide, it is intended that the set screw aforesaid shall be
turned to cause the spring to release the ribbon wire from pressure within the
guide during the formation of the straight portions of the coils, as hereinbefore
explained. This screw may be thus operated by hand, which will be a com-
paratively slow method, or by automatic mechanism which will turn it backward
and forward at given intervals, the said mechanism being operated from any
suitable moving part of the apparatus. In many cases however it will be found
desirable to substitute the spring and set screw of the gauge by the arrangement
represented in Figure 9, in which the gauge itself has a slot or opening in its upper
side through which passes the tongue all of a lever A" pivoted to the top of the
said gauge, a cam or eccentric B being arranged to act upon the opposite end of
the lever A at those intervals during which the straight portions of the coils are
being formed, the operation of the cam or eccentric B being to depress the
adjacent end of the lever A" and thereby lift the tongue a¹¹ out of contact with
the ribbon wire passing through the guide, the said cain or eccentric B" further-
more operating to release the lever A" at those intervals at which the curves or
bends are being formed in the ribbon wire, thereby enabling the tongue a" to
press with the requisite tension or pressure upon the ribbon wire as it passes
through the guide to be acted upon by the conical rolls, this last named movement
of the lever All being insured by a spring 6" placed upon and external to the
guide.
It is to be observed with regard to my said Invention that while it is more
particularly adapted to the manufacture of the revolving armatures of electro-
dynamic machines, nevertheless certain features of said Invention as will be
apparent to any competent electrician are also capable of use and application in
electro-magnets generally, and this Invention is not restricted solely to revolving
armatures, inasmuch as I propose to extend the said Invention to include electro-
magnets.
My Invention may also be applied to the construction of cominutators or
collectors of electro-dynamic machines by suitably placing the brushes or scrapers
as well as the electric communications.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Robert Lake in the Great Seal Patent Office on the
7th March 1882.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, and Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN THE MANUFACTURE OF
REVOLVING ARMATURES AND OTHER PARTS OF ELECTRICAL APPARATUS, AND IN
MACHINERY THEREFOR." A communication from abroad by Charles Dion, of the
City and State of New York, United States of America, Electrician.
This Invention relates chiefly to a novel construction of revolving armature
for electro-dynamic machines, and to a novel process and mechanism for making
the same.
In the accompanying Drawing,-
Figure 1 is a longitudinal sectional view of an armature made according to my
said Invention.
Figure 2 is an end view of the same.
Figure 3 is an end view showing the same in process of construction.
Figure 4 is a front view of a machine, also included in my said Invention, and
designed for the manufacture of the armature aforesaid.
Figure 5 is a similar view with some of the parts shewn in Figure 4 removed.
Figure 6 is a central vertical sectional view of the said machine.
Figure 7 is a detail view on an enlarged scale representing the conical rolls which
form part of the said machine.
Figure 8 is a detail view showing the shape of the flat wire as the same comes
from the machine preparatory to being applied to the core of the armature in the
operation of making the latter.
Figure 9 is a detail view, also on an enlarged scale, shewing a modification of the
guide which forms a part of the said machine.
Figures 10, 11, and 12 shew modifications of parts of the said machine.
Having reference first to Figures 1 and 2. A is the core of the armature made of
soft iron; B is the wire, which is flat or ribbon shaped, and which is placed in
parallel coils around the walls of the armature, as represented in Figures 1 and 2,
that is to say, the outer portion of each coil of the said wire is placed edgewise upon
the outer surface of the said core, while the inner portion of each coil is arranged
edgewise upon the inner surface of the core, passing through the tubular or hollow
interior of the latter, the successive coils being side by side, and together covering
the entire core. The coils are insulated by being coated with gelatine treated with
bichromate of potash, after which the coils thus coated with the said material are
exposed to the light, whereby an insoluble film of material having a sufficiently
insulated or non-conducting power is placed upon the wire.
In the formation of the wire preparatory to its application to the core A, as just
described, the said wire is bent so as to properly pass over and around the ends of
the walls of the core, as represented more particularly in Figure 1. Assuming the
wire to be brought to the proper shape, as represented in Figure 8, that is to say,
in coils having a suitable configuration continuous one with another and placed
side by side, the modus operandi of placing the wire upon the core is as follows,
reference being had to Figure 3:-The core itself is divided longitudinally in one
of its sides, for example, as indicated at a in the said Figure, and the parts are
sprung apart to a distance sufficient to permit the coiled wire to be slipped thereon,
and when a sufficient quantity of the said coiled wire is slipped upon the core A,
the two surfaces adjacent to the opening a are brought together and retained in
contact by riveting or by any other suitable means. The annular core may also, if

page_text: convenient, be formed of two semi-circular shaped parts connected together by means
of rivets, screws, or by any other suitable means.
In order to form the flat wire into suitable coils preparatory to its application to
the core A, as herein before explained, the said wire is first formed in the shape of
substantially flat ribbon, which is subjected to the operation of the machine repre-
sented in Figures 4, 5, 6, and 7. During this step of the preparation of the
flattened wire this wire may be passed cold through the machine, but I prefer to
plunge the said wire in a bath of melted lead, which brings it to red heat previously
to its passage between the rolls. This is chiefly designed for the preparation of
wide conductors.
The said machine has two strong shafts B and C, the ends of which are formed
into substantially bevelled or conical shape, as more clearly represented on the.
larger scale in Figure 7, the two shafts B and C being arranged at right angles to
each other, so that the adjacent faces of the conical rolls B, C, are substantially
coincident, but which are placed at a distance apart and in a position with reference
to each other corresponding to the requirements of rolling the wire ribbon into its
coiled form, as herein presently set forth.
It will be observed that assuming the two shafts B and C to rotate in unison, the
speed of the bevelled or conical surfaces will be greater as they approach the
greater diameter; thus, for example, the relative speed of the moving surfaces will
be greatest at band very slight at c, the speed of the intermediate parts being
proportioned to their distance from the point c. The shaft C is placed vertically in
suitable bearings provided in a yoke D, which is connected by suitable bolts a'
with the frame E of the apparatus, and which is furthermore provided with a slot d,
through which into a suitable nut in the frame E passes a broad headed screw c.
This screw e serves as a kind of fulcrum to support the yoke D to enable the latter
to be adjusted to bring the shaft C into the requisite relation with the shaft B.
This adjustment is necessarily comparatively slight, and provision is made therefor
by causing the holes in the yoke D through which pass the bolts a¹ to be of
sufficient size to permit the movement of the adjacent parts of the yoke D with
reference to the said bolts a¹. By turning the bolts a¹ and also the broad headed
screw e, the yoke D is readily fixed to the frame E. The shaft B in like manner
works in bearings provided on the frame E, but laterally adjustable thereon by
means of the screws f. The shaft B is provided with a suitable drum or pulley by
which it may receive motion-from-a-belt,-and-is-also-provided with a bevelled gear-
wheel F, which gears with a corresponding gear-wheel F¹ on the shaft C, so that
simultaneously an equal rotation is given to the shafts B and C, and consequently
to the conical rolls B and C¹. The shaft B bas also a spur-wheel G which works
into a spur-wheel G' on the shaft g of one of the pair of feed rollers H, H¹, the said
rollers being more fully represented in Figure 4.
Placed between the feed rollers H, H', and the conical rolls B₁, C', is a gauge or
guide K', the said gauge or guide being tubular, and having its interior of a size
and shape proportioned to the cross-section of the ribbon wire to be passed there-
through. A spring may be provided in the upper part of the bore of this
guide K', and the said spring may be forced downward by a thumb-screw e to
cause the said spring to press with greater or less force upon the ribbon as it
passes through the said guide. The guide K¹ itself is fixed upon a plate m which
is transversely slotted, and which is placed upon an inclined bed or table n formed
upon a bracket L¹.
The plate m is attached to the table n by broad headed
bolts f, which pass through the slots in the said plate into nuts suitably provided
in the table n. Inasmuch as the table n is slanted or inclined, it follows
that by adjusting the plate m upon the said table n the guide K¹ will be brought
into the exact position required to properly guide the ribbon wire from the
rollers H, H', to the conical rolls B¹, C¹ Each of the conical rolls aforesaid has a
portion of its surface chambered or cut away, as represented at 1 (Figure 3); these
recessed or chambered portions being so arranged as to come together opposite
each other at each complete rotation of the shafts B, C. In like manner the feed

page_text: rollers H, H¹, have a portion of their circumference cut away, as shewn at 8,
(Figure 6). The recessed portions 8 of the two feed rollers H, H', come opposite to
and coincident with each other at each complete revolution of the said rollers. The
wire having the substantially flat ribbon shaped form hereinbefore referred to is
indicated at I in Figure 6.
After the recessed portions 8 of the feed rollers H, H', have passed away from
their coincident position, the more closely adjusted surfaces of the said rollers H, H',
grip the ribbon wire I and feed the same forward in a substantially straight
direction as the same issues through and from the guide K', the chambered or
recessed portions of the conical rolls B¹, C¹, being at this stage of the operation
coincident with each other, and thus permitting the ribbon wire to pass forward
without being acted upon by the said conical rolls B¹, C. It is this forward
feeding in a straight direction of the ribbon wire I that forms the straight portions
of the coils, represented from v to w in Figure 8. When the rollers H, H', have so
far completed their revolution that the recessed portions & are brought opposite
each other and consequently adjacent to the ribbon wire I, it follows that the said
ribbon wire is released from the action of the said rollers, and it is at precisely this
stage of the operation that the chambered or recessed portions r of the conical
rolls B, C, pass away from each other, and the larger or working surfaces of the
said conical rolls B¹, C¹, becoming coincident grip the wire, and inasmuch as the
said working portions of the said conical surfaces of the rolls B', C', not only
move with greater speed at their outer portions, that is to say, at the portions
adjacent to the point b, but are placed closer together at such outer portions, it
follows that the outer edge portions of the ribbon wire I are compressed and drawn
at a more rapid rate than the inner portions which lie nearest the point c of the
rolls B, C, aforesaid, from which it follows that that portion of the ribbon wire I
acted upon by this contact of the working conical surfaces of the rolls B', C¹ is
bent into the arc of a circle, as indicated in Figure 6. It is this operation which
forms the semi-circular ends of the coils, as shewn in Figure 1, and inasmuch as
the operation of the rollers H, H', to feed inward the ribbon wire I without action
on the part of the conical rolls B¹, C¹, alternates with the action of the last named
rolls B, C, in drawing the wire between the recessed parts s of the rollers H, H', it
follows that the straight longitudinal portions of the coils are formed alternately with
the semi-circular ends thereof. The ribbon wire is thus shaped into a series of
parallel coils, each of which has straight sides and semi-circular ends, the coils
lying side by side, so that the coil being thus provided it is only necessary to coat
the same as hereinbefore explained, and then apply it to the core to form the
armature, as hereinbefore set forth.
As herein before described the guide through which the ribbon wire passes to the
conical rolls is constructed with an internal spring, the tension of which is adjusted
by a set screw, but inasmuch as it is desirable that the ribbon wire while being fed
to form the straight portions of the coils should not meet with any resisting action
from the guide, it is intended that the set-screw aforesaid shall be turned to cause
the spring to release the ribbon wire from pressure within the guide during the
formation of the straight portions of the coil, as hereinbefore explained. This screw
may be thus operated by hand, which will be a comparatively slow method, or by
automatic mechanism which will turn it backward and forward at given intervals,
the said mechanism being operated from any suitable moving part of the apparatus.
In many cases however it will be found desirable to substitute for the spring and
set screw of the guide the arrangement represented in Figure 9, in which the
guide itself has a slot or opening in its upper side, through which passes the
tongue a of a lever A" pivoted to the top of the said guide, a cam or eccentric Bu
being arranged to act upon the opposite end of the lever A" at those intervals,
during which the straight portions of the coil are being formed, the operation of
the cam or excentric B being to depress the adjacent end of the lever A" and
thereby lift the tongue all out of contact with the ribbon wire passing through the
guide; the said cam or excentric B" furthermore operating to release the lever A

page_text: at those intervals at which the curves or bends are being formed in the ribbon wire,
thereby enabling the tongue a" to press with the requisite force upon the ribbon
wire as it passes through the guide to be acted upon by the conical rolls, this last
named movement of the lever A" being ensured by a spring 6" placed upon and
external to the guide.
According to the curve which it is desired to give to the coils of the conductor
cylinders B, B, partly parallel and partly conical, and gearing with one another,
may be placed between two standards C and worked by means of a pulley A, as
shewn in Figure 10. The conical parts of the cylinders may also be placed out-
side the standards, as shown in Figure 11, or the cylinders B, B, may be placed
at right angles one above the other and provided with conical parts D, D, and
conical guides F, F, as shewn in Figure 12.
These three last arrangements as well as the first allow of obtaining a con-
tinuously coiled fat ribbon. For this purpose it is only necessary in the first
arrangement to dispense with the grooves made in the conical parts of the cylinders.
It is obvious that I may pass through the machine at one time a number of
flattened wires or ribbons instead of one, as above stated.
The said Invention is more particularly adapted to the manufacture of the
revolving armatures of electro-dynamic machines, nevertheless, certain features of
the said Invention are also capable of use and application in the manufacture of
electro magnets generally, and this Invention is not restricted solely to revolving
armatures, inasmuch as I propose to extend the said Invention to include electro-
magnets.
I would also point out that my system of armature allows me to dispense with
the commutators employed in dynamo-electric machines, and permits the direct
application of the brushes to the conducting coils of the armature. One of the
brushes should be placed at the outside of the conducting coils, and the other
should bear on a conducting sleeve or collector keyed on the axle of the armature.
Besides my coils offer less resistance to the electric current than wires, because
they develope a larger surface than wire having the same sectional area.
Moreover with my armature there is scarcely any diminution of the initial
energy, as it presents a larger cooling surface; so as to still further diminish the
risk of heating I reserve to myself the right of boring holes conveniently placed
at the edges of the Hat coils. The core itself may be corrugated or indented so
as to leave a free-space-for-the-passage of air-between the core and the coils.
Having thus fully described the said Invention, as communicated to me by my
foreign correspondent, and the manner of performing the same, I wish it understood
that I claim,
First. The process herein described of making the revolving armatures of electro-
dynamic machines by winding the flattened wire edgewise longitudinally upon
the longitudinally divided core, and then uniting the divided edges of the core in
contact with each other to give the hollow or tubular form to the armature, all
substantially as and for the purpose herein set forth.
Second. The armature composed of a tubular core and the flattened wire wound
longitudinally upon the walls of the said core, the wire being edgewise with
reference to the inner and outer surfaces of the said walls upon which it rests, all
substantially as and for the purpose herein set forth.
Third. In an armature and like devices a flattened wire coated with a compound
of gelatine and bichromate of potash hardened by exposure to the light, the said
flattened wire being wound longitudinally upon the walls of the core with the coils
lying edgewise with reference to the inner and outer surfaces of the said walls,
substantially as and for the purpose herein set forth.
Fourth. The method, herein described of forming the coils of armatures, electro-
magnets, and the like, by subjecting the ribbon wire to the action of conical rolls,
the axes of which are substantially at right angles to each other, so that a
differential drawing and compressing movement is exerted upon the ribbon wire
to curve the same at the requisite parts, all substantially as and for the purpose

page_text: herein set forth, whether the conical parts of the rollers are provided with recesses
which allow of obtaining elongated coils or are smooth, which permits of obtaining
ordinary circular coils.
Fifth. The method herein described of forming oblong coils of flattened wire for
the armatures of electro-dynamic machines and the like by subjecting the ribbon
wire alternately to the action of coincident conical rolls to form the bends at the
ends of the coils, and of parallel feed rollers to form the straight portions of the
coils, all substantially as and for the purpose herein set forth.
Sixth. In an apparatus for forming the coils for the armatures of electro-dynamic
machines and the like, the combination of the conical rolls B¹, C', constructed
with recessed portions r, and provided with mechanism for giving movement in
unison simultaneously to the two rolls, substantially as and for the purpose herein
set forth.
Seventh. In an apparatus for forming the coils for the armatures of electro-
dynamic machines and the like, the combination of the recessed conical rolls B¹, C¹,
the guide K' and the recessed parallel rollers H, H', the whole combined and
arranged for joint use and operation, substantially as and for the purpose herein set
forth.
Eighth. In an apparatus for forming the coils for the armatures of electro
dynamic machines and the like, the combination of the yoke D carrying the shaft
of the conical roll C¹ with the bearings on the frame E which support the shaft
of the conical roll B¹, whereby provision is made for adjusting the conical faces of
the two rolls with reference to each other, all substantially as and for the purpose
herein set forth.
Ninth. In an apparatus for forming the coils for the armatures of dynamo-electric
machines and the like, the application of cylindrical rolls B, B, having conical
ends placed either inside or outside the standards C of the apparatus and
parallel to one another, as above described and shown in Figures 10 and 11 of the
Drawings.
Tenth. In an apparatus for forming the coils for the armatures of dynamo-electric
machines and the like, the combination of two cylindrical rolls B, B, placed
perpendicularly one to the other and provided with conical guides F, F, as above
described with reference to Figure 12 of the Drawings.
Eleventh. In my improved armatures for dynamo-electric machines the direct
application of the brushes to the conducting wires, so as to collect the currents
induced therein without the aid of commutators, substantially as and for the
purposes set forth.
Twelfth. In a core for armatures of dynamo electric machines or other apparatus
the arrangement of corrugations or indentations allowing of a free passage for the
air between the said core and the conducting wires, as above described.
Thirteenth. Plunging the flattened wires in a bath of melted lead for the purpose
of bringing them to a red heat previously to inserting them in the machine which
gives them the desired curve, substantially as described.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Seventh day of March, in the year of our Lord One
thousand eight hundred and eighty two.
W. ROBT. LAKE. (L.S.)