Year: 1888

page_text: I, HERBERT JOHN ALLISON, of the firm of Allison Brothers, of 52 Chancery Lane,
London, in the County of Middlesex, Patent Agents, do hereby declare the nature of
this invention, which has been communicated to me from abroad by "The Baxter
Electric Manufacturing and Motor Company" (Incorporated), of Baltimore, Maryland,
United States of America, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement
-
The object of this invention is to furnish an improved means for automatically
controlling the movements of an electric motor when operating with a variable load,
and the invention consists partly, in an improved construction for the magnet coils,
partly, in an improved means for connecting the same with a shunt box, and partly,
in an improved means for diminishing the friction of the governor, and for regulating
and varying the resistance to its movements The improvements are especially
adapted to motors which use a constant current such as is employed in arc light
circuits, and the speed of the motor is regulated by modifying the strength of the
magnetic field automatically, by the action of the governor
The invention will be understood by reference to the annexed drawing, in which
Fig 1 is a side elevation of a motor provided with the improvements, certain parts of
the governor being shown in section on their central line where hatched, Fig 2 is an
end view of the motor with the parts at the left of the dotted line a, a, in Fig 1,
omitted Fig 3 is a plan of one of the pole pieces detached from the motor frame
and viewed at right angles to its axis, with the elbow pieces for connecting the coils
to the shunt box Fig 4 is an edge view and Fig 5 a plan of the elbow connections
from the coils to the shunt box, and Fig 6 is a transverse section of the elbow
connections on line x, x, in Fig 5
Fig 7 is a side view of the shunt box with its connector and governor rod, Fig 8
is a plan of the same with the elbow connections at one side omitted, as well as the
cover to the spring holder and the connector and governor rod, and Fig 9 15 1
transverse section of the same on line x, x, in Fig 7

page_text: 2
Fig 10 is an end view of the governor lever, Fig 11 is a side view of the governor
lever, Fig 12 side view of the governor sleeve with collar in section, Fig 13 15
an end view of the governor collir, Fig 14 is side view of the cheek piece for the
shunt box, Figs 15 and 16 aro 1 plan and side view of the spring guide and
holder, Figs 17 and 18 are a plan and end view of the cap for the spring holder
Fig 19 is side view of the same, Figs 20 and 21 are a plan and end view of the
spring abutment, Fig 22 is a diagram showing the polar wrappings with their shunt
connections, and Fig 23 is an end elevation similar to Fig 2 with one of the magnet
poles partly in section to show the shunt connections
In Fig 8 the cap 2, check pieces 7, and shunt block h, are removed, and the springs s'
are inserted in only one side of the shunt box
A is the frame of the motor, forming the bridge between the magnet poles B, and
provided with bearings C for the arbor of the ariniture D The governor is mounted
upon a shaft F¹ extending from the end of the arbor F The inner ends of the links
are pivoted to rotate with a collar I affixed to the shaft, and the outer onds of the
links are pivoted to sleeve I¹, shown detached in Fig 12, and furnished at its inner
end with head I, and at its outer end with a nut [³ A collar J is fitted to the
sleeve between the head and the nut, and provided with pivots J', which operate in
sockets Jin governor lever J*
The nut Is and the collar J are each formed with an annular groove?, und balls a
are inserted in the groove (being shown in Figs 12 and 13) to diminish the friction
between the nut and collar when the sleeve is drawn inward by the expansion of the
governor links
The lever is pivoted at upon the guard E', and is furnished with an arm H having
a tightening bolt H¹ fitted in its outer end and connected with a spring H*
The bolt is connected with the spring by an eye, and is provided with wedge-
shaped block H³ having sharp edges fitted to forked bearing in the end of the
arm H, and adjustable by a nut H, to vary the tension of the spring. The spring is
extended from the bolt at an acute angle with the arm H past the pivot 3, and is
attached to the frame A in such position that an increased speed of the governor links
operates to extend the spring
The links are shown in Fig 1 in the position assumed at their greatest velocity,
and the spring operates, when the velocity is diminished, to draw the arm H downward
and the sleeve I outward, thus drawing the mass of the links nearer to the shaft Fl
The movement of the bolt around the pivot 7, as indicated by the dotted line', ',
is not at right angles with the spring, and therefore operates, as the spring retracts,
to move the 18 of the spring gradually away from the pivot 3, and to thus increase
the leverage of the arm # This increase in the force of the spring upon the arm H,
corresponds with the increased mechanical power of the governor links when they
lie close to the shaft F, and thus renders the springs resistance to the movements
of the governor very nearly uniform throughout its entire range
The governor is thus rendered more sensitive, while the tension of the spring
19 mide adjustable by means of the nut H, and it may thus be graduated to regulite
the sensitiveness of the governor in the desired degree With a spring resistance to
the governor, the tension of the spring usually increases as it is extended, the
movements of the governor, with such a construction, thus encounter a greater
resistance as the velocity increases, and a delicate adjustinent of its operations is
practically impossible, while by my construction, the resistance may be made nearly
uniform throughout its whole length of movement, or may be graduated so as to be
greater or less at high velocities, as may be desired
The velocity of the motor is regulated, in this invention, without varying the
position of the commutator brushes, the intensity of the magnetic field being changed
when it is necessary to vary the power of the motor, by cutting out more or less
of the magnet or field wire coils which are wound around the pole picces B The
wrapping of the magnet is formed of a continuous wire with its primary end c
connected with the circuit in any convenient manner c' is the first coil extending
between the flanges B₁ of each pole piece, and c³, c³, c, and so on, are the exterior

page_text: coils wrapped about the first, the final coil being arranged to connect with opposite
pole pieces or with the commutator brushes, in the usual manner
When operating
with full load, the current enters the first coil upon one pole, and after traversing
all the other coils, passes through the coils upon the other pole, and thence through
the commutator and armature to rejoin the electric circuit To diminish the intensity
of the magnetic field in any desired degree, I extend a shunt connection formed of
flat strip e, e¹, e³, e³, &c, from each coil (or any other preferred section of the polar
wiappings) to a shunt box, where a shunt block or connector & may operate to unite
the similar coils upon the opposite poles, and thus cut out such part of the polar
wrapping or field wires as is desired In Fig 22 is shown, by a diagram, the
operation of these shunt connections, c¹ c², c³, c³, and c³, representing an equal
number of coils upon the opposite magnet poles
G represents the positive current wire, G₁ the negative, G³ the commutator,
and e¹, e³, and so on, the strip or shunt connections from the several coils, terminating
in springs in a shunt box
A shunt block d is movably arranged to unite electrically any of the similar
connections e, e³, and so on, when placed in contact with the opposed ends of the springs
When such shunt connections are disconnected, the current passes through all the
coils and produces a magnetic field of maximum intensity, but when the pair of coils
farthest from the connection G are united by placing the block d in contact with the
springs e, it is obvious that the coils c would be entirely cut out of the circuit, and
the intensity of the magnetic field correspondingly diminished In like manner if the
block be placed in contact with the springs e, two coils would be cut out of the
circuit, and if the block be placed in contact with the springs e, the current would
pass directly to the commutator through such block, without circulating around the
pole pieces at all The motor would then be destitute of power except for the residual
magnetism in the metal of the poles, and to neutralize such magnetism when it is
desired to stop the motor, I do not connect the current with the first turn of the coil c³,
but at a point c several turns distant from the beginning of the coils
Such turns are therefore wholly outside of the circuit, on its passage through the
coils c, c, c³, and so on, and afford a means of throwing reverse current directly
around the poles, by connecting the first of such turns, through sections e, with the
shunt box, where they may be connected by the bloch d when it 18 desired to thus
reverse the current In Fig 22 the normal movement of the current is shown by the
arrows K, while the movement of the reverse current is clearly indicated by the
arrows K³, applied to that portion of the coil c¹ which is connected with the springs e
The connections of such springs by the block d furnishes a short circuit for the
current by cutting out the remainder of the coil c¹ and the coils c³, c³, &c, and the
magnetic field is thus not only deprived of its normal magnetism, but its polarity is
reversed in the degree required to extinguish the residual magnetism The number
of turns required upon given magnet, to produce this effect, is readily determined in
practice and the practical construction for making the connections e, e¹, &c, are
shown in Figs 3 and 23, applied to the poles, and in Figs 7, 8, and 9, connected with
the shunt box
The primary connection G is shown in Fig 3 applied to the 8th turn c of the coil c¹
while the flat connection e is shown applied to the first turn, and carried long the
pole piece beneath the whole of the first coil, from which it is extended, through a
notch in the flange B' of the pole piece, to an elbon piece a connected with the
shunt box
The connections e are formed of flat copper strips which are readily arranged and
insulated between the several coils, and are extended along the heads B* of the pole
pieces nearly to the shunt box L which is secured between the heads of the pole
pieces over the top of the armature The shunt box is formed with a series of flexible
springs connected in pairs with the opposed ends of the strips el, e², &c, and sustuned
adjacent to one another in a spring guide g, over which a shunt block his moved by
the governor, as required The spring guide is shown in Fig 8, as also in the other
views, in Figs 15 and 16, as a block of wood or analogous material, with notches g¹

page_text: in its opposite edges, to receive elbow connections from the springs, and formed with
vertical slits g² in its opposite edges through which the springs project upward in the
path of the shunt block h A cap, beveled at its forward end adjacent to the springs,
is fitted over the guide g to support the block h when retracted from the springs, and
15 formed with stops, to then arrest the block An abutment k is inserted in the
shunt box in front of the springs, and caps l, shown only in Figs 7 and 9, would be
placed at each side of the pieces g and at the points indicated at in Fig 8, to keep
the springs in the slits 92 The parts 9, 2, h, and I, would be formed of wood or other
insulating material and would be secured in the spring box by suitable fastenings
The block is secured by nuts h¹ adjustably upon rod h³ connected with the
governor lever J, and moved thereby with the varying velocity of the armature
To press the rod toward the springs to make a positive electrical contact therewith, a
roller h³ is mounted upon the shunt box L over a part of the rod h³, and is provided
with a screw shank m fitted to a standard n upon the shunt box, and adjustable by
means of threaded nuts n¹
The top of the abutment is inclined, like the end of the cap and the springs
are bent to a similar angle, so as to yield readily as the block moves over them, and
the list spring, which is connected with the strip e, is laid upon the inclined face of
the abutment, so that the shunt block may press it hard upon the same to form a
more perfect connection therewith, when the operation of the governor is intended to
cut off all the field coils from the electrical circuit, and to reverse the polarity of the
mignet to remove the residual magnetism The motion of the rod h³, when trans-
mitted from the governor lever, is parallel with the armature arbor, while the shunt
connections from the pole pieces are conducted at right angles to the irmature to
reach the shunt box by the shortest course
To join the shunt connections conveniently with the springs, I therefore provide
the litter with elbow pieces s formed integral with the springs and extended at right
angles thereto so as to project over the heads of the pole pieces toward the field coils
A notch is formed in the flange B¹ and all the strips e', e³, &c, which extend from
the field coils, are brought directly into line with the elbow pieces to make the shortest
possible connection therewith, as shown in Figs 3 and 22
The strips e, e, &c, are clamped upon the head B alternately with the elbow
pieces, cach strip making an electrical connection with one of the springs, and
paper or equivalent insulation & being inserted between each of the separate pairs of
connections, as shown in Figs 4 and 6 The clamp and screws press the group
of connections to the head, and the entire bundle of connections would be
perfectly enveloped with a non-conducting and waterproof coating s6, as shown in
Fig 6
My arrangement of the shunt connections in the field-coils differs from any other
in extending such connections from different points within the coils, under or between
the coils to single point of exit, as the notch in the flange B¹, and in forming the
several connections into a compact bundle which may be thoroughly protected from
accident or derangement, while its sever il contacts may be readily connected with a
suitable shunt box I thus avoid the liability to damage and derangement which
occurs when the shunt connections are extended separately from different points of
the field coils, and are led separately to binding posts or to a switch board, to form
the desired shunt connections It is obvious that the reverse current may be produced
by winding an entirely distinct or separate coil upon each pole piece, instead of
utilizing one of the field wire coils as shown herein, and I do not therefore limit
niy self to the particular construction shown, provided a shunt circuit be conducted
around the pole piece in the reverse direction (when the miguet coils have been cut
out) to reverse the polarity of the field as desired It is obvious that the construction
for the springs in the shunt box may be used where only a single contact piece and a
single set of springs are desired to operate with single set of shunt connections
I have not made any specific clums herein to the shunting device shown particularly
in Figs 7, 8 and 9, as I have made a separate application for such shunting device,
bering even date herewith, but I have fully shown and described the shunting

page_text: device in my present application to render the operation of the motor more
intelligible
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
clain herein is -
1 In an electric motor, the combination, with the series of coils wound upon the
magnet cores, of a series of shunt connections united with the several coils at intervals,
means, as a shifting block or piece, for closing successively the electrical circuit
through the several shunt connections, a centrifugal governor mounted upon the
armature arbor or shaft, a lever actuated by such governor to operite the shunt
connector, and an arm attached to such lever, and a tension spring resisting the
centrifugal force of the governor and arranged at an acute angle with the said irni
to operate with a diminishing leverage upon the arm as the speed of the motor
increases, is and for the purpose set forth
2 In an electric motor hiving the pole pieces united by a bridge, the combination,
with a series of coils wound upon the field magnet cores, of the shunt connections, e, e¹,
e², &c, united with the several coils at intervals, and extended from the surface
of the magnet coils (at the same point) to the bridge, from the opposite sides thereof,
a shunt box upon the bridge between the pole pieces with contacts united to the said
shunt connections, a shunt block or other suitable connector, and a centrifugal governor
actuated by the motor for successively closing the circuit through the shunt connections,
as and for the purpose set forth
3 In an electric motor, the combination, with the main coils upon the magnet
cores of an auxiliary coil connected with the line or circuit wiles and wound upon
the cores in the opposite direction from the main coils, a shunt connection from the
ends of such auxiliary coil, shunt connections attached at intervals to the main coils,
contact pieces attached to such shunt connections, and a moving contact operiting,
in connection with the same, to first close the circuit through the shunt connections
of the main coils and to subsequently close the shunt connections from the auxiliary
coil, to cause a reaction upon the residual magnetism of the field when the motor is
very lightly loaded, substantially as herein set forth
4 In an electric motor, the combination, with the first coil of wire wound upon the
magnet cores, of the line or circuit connection attached to the coil between its ends,
an electrical connection from one end of the coil to the other coils, and a shunt
connection from the opposite end of such coil, and means for closing the circuit
through such shunt connection to react on the residual magnetism of the field, as and
for the purpose set forth
5 In an electric motor, the combination, with the magnet cores having poles at
opposite sides of the armature, of the magnet coils wound upon such cores, a shunt
box mounted upon a bridge between the ends of the poles, shunt connections attached
at intervals to the main coils and terminated in electrical connections adjacent to one
another in the shunt box, a governor mounted upon the armature shaft, and a
connector moved thereby to successively close the several shunt circuits and thus
cut out the successive sections of the main coils from the circuit, as and for the
purpose set forth
6 In an electric motor, the combination, with magnet cores having poles at
opposite sides of the armature, of the main coils wound upon such cores, a shunt
box mounted upon a bridge between the ends of the poles, shunt connections or
strips attached at intervals to the main coils with the latter wrapped over the same,
and the said strips terminated in electrical connections adjacent to one another in
the shunt box, a governor actuated by the motor, and a connector moved thereby
to successively close the several shunt circuits and thus cut out the successive
sections of the main coils from the circuit, as and for the purpose set forth
7 The combination, in an electric motor, of a governor affixed to the armature
shaft and having expanding weights linked to a sliding sleeve upon such shaft, the
sleeve being provided with a thrust ring grooved to receive anti-friction balls, and

page_text: with a collar pivoted to governor lever, and the collar being pressed against the
thrust ring by a spring applied to the governor lever, as and for the purpose set
forth
8 In an electric motor provided with a bridge between the pole pieces and a shunt
box mounted upon the said bridge, the combination, with the cores, of flanges upon
the same, field coils wound between said flanges, shunt connechons attached at
intervals to the field coils with the latter wrapped over the same, a notch in one
of the flanges, and the shunt connections brought together and extended through such
notch in single band to the shunt box, as and for the purpose set forth
9 In in electric motor, the combination, with bridge between the pole pieces
and a shunt box mounted upon the sud bridge, of the magnet cores, field coils wound
upon said cores, shunt connections att iched at intervals to the field coils [with the
latter wrapped over the same] and extended from the coils tow ird the shunt box
upon the bridge, elbow pieces s, s', having each, one arm fitted in the shunt box to
form a cont ict surface, and the other arms extended upon the pol pieces between the
several shunt connections, insulating material between the several shunt connections,
and a clisp pressing such connections and elbow pieces together, as and for the
purpose set forth
10 In in electric motor, the combination, with a bridge between the pole pieces
and a shunt box mounted upon said bridge, of the magnet cores, field coils wound
upon said cores, shunt connections formed of flat strips of thin sheet metal attached
at intervals to the field coils and extended beneath the several layers of the field coils
to the same point upon the exterior of the latter, and to the shunt box upon the
bridge, and connected with contacts therein, as and for the purpose set forth
June 1800

page_text: Date of Application, 5th June, 1888
Specification Accepted, 5th June, 1889
I, HERBERT JOHN ALLISON, of the firm of Allison Biothers, of 52 Chancery Lane,
London, in the County of Middlesex, Patent Agents, do hereby declare the niture
of this invention, which has been communicated to me from abroad by "The Baxter
Electric Manufacturing and Motor Company" (Incorporated), of Baltimore Maryland,
United States of America, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement
1
The object of this invention is to furnish an improved shunt box for connecting
successively a series of contacts, and in some instances, for connecting two series of
contacts electrically through the medium of a single block, and the invention is
particularly adapted for varying the course of the current in the magnet coils of an
electric motor, as set forth in the patent No 8170, dated June 5th 1888, in which the
same shunt box is shown mounted upon a bridge between the pole pieces, and suitably
connected with portions of the field magnet coils
The invention is not however limited to such a single application or use, as it 19
applicable to other uses
In the drawings Fig 1 is a side view of the shunt box with its connector and
governor rod, Fig 2 is a plan of the same with the elbow connections at one side
omitted, as well as the cover to the spring holder and the connector and governor rod,
Fig 3 is a transverse section of the same on line x, x, in Fig 2
Fig 4 is a plan of one of the elbow pieces Figs 5 and 6 ire plan and side view
of the spring guide and holder, Figs 7 and 8 are a plan and end view of the cap
for the spring holder, Fig 9 is a side view of the same
Figs 10 and 11 are a plan and end view of the spring abutment, Figs 12 and 13
are respectively a side view and an edge view of the cheek piece 7, and Fig 14 is a
diagram showing the shunt connections from the shunt box to the coils of an electro
motor magnet
In Fig 2 the cap 2, cheek pieces and shunt block are removed, and the
springs are removed from one side of the shunt box to expose the slits
The shunt box is shown constructed upon frame L idapted to fit upon the bridge
of a motor, or to be attached, in any suitable position, by meins of bolts pissed through
boles L

page_text: The frame is provided with a suitable recess to receive 1 bed or guide g provided
with a series of shits 9 in which the springs which form the shunt connections are
sustained in the path of the movable connector or shunt block
The connector is lettered herein, and shown affixed to a head secured upon a rod h³
by nuts h¹
The rod is shown provided with a pivot ³ at one end by which it would be con-
nected with governor or other suit ible means for actuating it as desired
The shunt connections nie lettered e, e¹, e², es, e¹ and e, in Fig 14, where they are
shown without any of the parts which sust un them in the proper position in the shunt
box, and the connector is shown in the same figure is a mere rectangular block h
adapted to move between the opposed ends of the springs, to illustrate the action of
the connector over the spring ends of the shunt connections when sustained by the
guide q
c, c, &c, represent a series of coils wound upon the cores of a motor field magnet,
for the purpose of illustrating the operation of the shunt block or connector upon the
springs s¹ shown in the shunt box in Fig 1
Grepresents the positive current wire, G₁ the negative, G³ the commutator, and
e, e and so on, the strips or shunt connections from the several coils, terminating in
springs sinthe shunt box
The shunt block his arranged to move over the ends of the
springs s¹, to unite electrically any of the similar connections e¹, e² &c The shunt
block is made, in practice, long enough to cover all the springs at once, to
prevent its rear end from catching upon their ends when the block is retracted
As the block may thus cover any number of the springs under one of its ends, it
may operate, if such springs form the terminals of suitable circuits, to short circuit
either or any part of the magnetic coils independently of the other
When the block is withdrawn from all the springs, the current passes through all
the coils and produces a field of maximum intensity, but if the pur of coils furthest
from the connection G are united by placing the block d in contact with the springs 8',
it is obvious that the coils c would be entucly cut out of the circuit and the intensity
of the magnetic field correspondingly diminished In like manner if the block bo
placed in contact with the springs attached to the connections e, two coils would be
cut out of the circuit, and if the block be placed in contact with the springs attached
to the connections e, the current would pass directly to the commutator through such
block, and all the magnet coils would be cut out
The shunt box is shown in Figs 1, 2 and 3, adapted to receive the con-
nections e e¹, e² &c from such magnet coils, or the shunt box may when used for
other purposes, receive its electrical connections from other branch circuits or sections
of circuits
The shunt box is shown formed with a series of flexible springs ¹ corresponding to
those shown in Fig 14, but formed with in elbow pieces which projects from the side
of the shunt box to be united electrically with the required circuit connections_ The
ends of circuit connections lettored e, es, are shown in Fig clumped in a bundle
with the elbows s, and such elbows would thus become the electrical terminals of the
shunt connections, suitable insulating miteriil being placed between the several
connections e to e³, to prevent the conduction of electricity from one to another, or to
the wrong elbow piece
In the drawing the springs s¹ in the opposite sides of the shunt box, are shown
connected in pairs with the opposed ends of the strips e¹, e, &c, and sustained
adjacent to one another in spring guide g, over which a shunt block h is moved
by the rod, is required The spring guide is shown in Fig 2, is also in the
other views in Figs 5 and 6, as a block of wood or railogous in iterial with notches g¹
in its opposite edges, to receive elbow connections from the springs, and formed
with vertical slits in its opposite edges through which the springs project upward
in the pith of the shunt block h
A cap beveled at its forward end dicent to the springs is fitted over the
guide to support the block when retracted from the springs, and is formed with
stops to then arrest the block
9

page_text: An abutment k is inserted in the shunt box in front of the springs, and caps ɩ, shown
only in Figs 2 and 3 would be placel at each side of the pieces 9 and 1, to keep the
springs in the shit»'qª
The parts o,, k, and I, would be formed of wood or other insulating material, and
would be secured in the spring box by suitable fastenings The block is secured by
nuts I adjustably upon the rod h³ connected with the governor lever, and moved
thereby with the varving velocity of the armature To press the rod toward the
springs to make a positive electrical contact therewith, a roller ³ 15 mounted upon
the shunt box over a part of the rod h³, and is provided with a screw shank m fitted to
a standard n upon the shunt box and adjustable by means of threaded nuts o
The top
of the abutment is inclined like the end of the cap, and the springs are bent to
similar angle so as to yield readily is the block moves over them, and the last spring,
which is connected with the strip e, is laid upon the inclined face of the abutment, so
that the shunt block may press it hard upon the same to form a more perfect con-
nect on therewith, when the operation of the governor is intended to cut off all the
field coils from the electrical circuit, or to reverse the polarity of the magnet to remove
the residual inagnetism as set forth in my patent No 8170 of 1888 The motion of
the iod, when transmitted from the governor lever, is parallel with the armature
arbor, while the shunt connections are, for convenience, brought toward each side of
the shunt box, and the springs are therefore preferably formed as elbow shaped
pieces (shown in Fig 4) and adapted to be clamped to the shunt connections from the
magnet coils by any suitable means, as the straps & and screws 8, shown in dotted
lines in Figs 2 and 3 The arms lie in the notches g' in the opposite edges of the
guide piece g, and the arms s' are projected upward through the slits g³ and bent, each
of them, at the desired angle, for the connector or shunt block h to move readily
over them
If the movable block or contact piece / shown in Figs 1, 2 and 4, be made of metal,
it would operate the same as the block in Fig 14, to connect the opposed ends of
the spring, but such block may be formed of insulating material and provided only
with met il upon its opposed ends, to form contact pieces insulated from one another,
and such contact pieces would each operate only to connect the springs with which it
15 in contact upon one side of the shunt box
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what 1
claum is
-
1st The construction for the shunting device substantially as described in connection
with Figs 1 and 2, and having a series of yielding springs formed of flat metallic
strips, a holder to sustain such springs with their flat sides adjacent, and a movable
contact irringed and operated to move in succession over the yielding ends of the
springs, as and for the purpose set forth
2nd The construction for the shunting device substantially as described in con-
nection with Figs 1 and 2, and having a series of vielding springs formed of flat
metallic strips, a holder formed with a series of adjacent slits to sustain the yielding
springs with their flat sides in proximity, a movable block or contact arranged and
operated to move in succession over the yielding ends of the springs, and an abutment
arranged at the end of the springs to receive the pressure of the block or contact,
upon the last spring, as and for the purpose set forth
3rd The construction for the shunting device substantially as described in con-
nection with Figs 1 and 2, and having a series of yielding springs formed of flat
metallic strips, a holder formed upon its opposite edges with two series of adjacent slits
to sust un two series of yielding springs with their flat sides in proximity, and a
movable block or contact arranged and operated to press in succession upon the
yielding ends of sud springs to connect the opposed ends of the springs electrically, as
and for the purpose set forth
4th in an electrical shunt box, the combination, with the two series of yielding
springs and the contact piece movable over the same, as set forth, of a holder formed

page_text: upon its opposite edges with two series of adjacent slits fitted to the yielding springs,
and having a stop to arrest the movement of the movable contact piece when retracted
from contact with the series of springs, substantially as described with reference to
Figs 1 and 9
5th In an electrical shunt box, the combination, with a holder formed upon its
opposite edges with two series of slits, of two series of yielding springs fitted to such
slits, a rod movable parallel with the surface of the springs, a contact piece fixed upon
the rod and fitted to the ends of such springs, and an adjustable roller /* for
pressing the rod toward the springs, substantially as described in connection with
Fig 1