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Патент USA US2412293

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Dec. 10, 1946. ‘
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Filed June 2, 1942
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Filed June 2, 1942
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Dec. 10, 1946.
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Patented Dec. 10, 1946
Walter Haines Schymik, Oreland, Pa., assignor to
I-T-E Circuit Breaker Company, Philadelphia,
Pa., a. corporation of Pennsylvania
Application June 2, 1942, Serial No. 445,429
4 Claims. (01. 175-298)
My invention relates to a ?eld switch for plac
ing a resistance across the ?eld winding of a
motor or other similar inductive circuit when the
circuit is opened and, more particularly, to a
combined circuit breaker and ?eld switch so ar
ranged that they operate to complement each
During the interruption of highly inductive di
rect current circuits, momentary high voltages
ner that when the truck is racked into position,
both the field switch elements and the circuit
breaker elements are simultaneously placed in
condition for operation.
Another object of my invention is the arrange
ment of ?eld switch and circuit breaker elements
on a removable truck in such manner that a re
sistance is always connected across the ?eld wind
ing or similar inductive circuit when the circuit
are produced, as is well known in the art, which 10 breaker is racked out of position.
may be sufficient to break down the motor wind
Still another object is to provide a cell having
ing and other insulations of the system. To pre
a switch independent of the disconnecting con
vent damage to the winding, it is customary to
tacts and which is operated to open'and closed
provide a bypass circuit around the winding
position by the racking in and out of the truck.
through a resistance during the opening of the 15
These and many other objects of my invention
supply circuit. This resistance in the circuit
will be apparent and, where not; apparent, point
reduces the momentary voltage rise in the cir
ed out in the following description and drawings,
cuit and, therefore, protects the winding of, for
in which:
instance, the motor or similar inductive circuit.
In circuits of this character, it is thus neces
sary immediately to introduce a resistance when
the motor circuit is interrupted for any reason.
An object of the present invention is to pro
vide means for integrating a circuit breaker and
Figure 1 is a side elevation with one of the
side sheets removed of a circuit breaker truck
withdrawn from a stationary switchboard cell.
Figure 2 is a front view of a circuit breaker
panel showing the contacts and a portion of the
mechanism thereof and the ?eld switch.
?eld switch (for connecting the ?eld winding
Figure 3 is a side view taken from line 3-3
of Figure 2 looking in the direction of the ar
elements operate to complement each other, so
rows, showing the circuit breaker panel carry
that one is opened when the other is closed.
ing the circuit breaker and ?eld switch elements
Another object of the present invention is to
in its operative position in the switchboard cell.
mount the ?eld switch operating elements on 30 Figures 4, 5 and 6 are schematic views show
the same panel with the circuit breaker operating
ing three operating positions of‘the elements of
elements so that they may be simultaneously
Figures 1, 2 and 3; Figure 4 showing the circuit
placed in position.
breaker closed and ?eld switch open; Figure 5
A further object of the present invention is to
showing the circuit breaker open and ?eld switch
across a resistance) in such manner that the two
‘ mechanically interlock circuit breaker and ?eld 35 closed; and Figure 6 showing the circuit breaker
switch operating elements so that operation of
the circuit breaker results in operation of the
?eld switch.
Still another object is the arrangement of the
circuit breaker and ?eld switch operating mem 40
bers so that the ?eld switch closes before the
and field switch operating elements racked out
of the switchboard cell with an auxiliary ?eld
switch in closed position.
Figure '7 is a schematic view illustrating the;
operation of the ?eld switch.
Figure 8 is a cross-sectional view correspond
circuit breaker opens and so that it opens after
ing to a portion of Figure 3 and showing a modi
the circuit breaker closes.
fled form of disconnect structure for my ?eld
Where circuit breakers are mounted on trucks
which are to be racked into and out of engage 45 In general, my invention contemplates insert
ment with cells in a stationary switchboard, ad
ing a resistance 85 (Figure 4) across an induc
ditional means should be provided for placing
‘ tive winding 40 in response to any action which
a resistance across the ?eld winding of a motor
or other similar inductive circuit so that an"
disconnects such a winding from its source of
invention is the provision of means for mount- '
supply and just preceding such disconnection;
momentarily induced voltage will not result in 50 and for cutting said resistance out of the circuit
with the inductive winding immediately after said
Accordingly, a further object of the present
winding has been connected with its source of
ing a ?eld switch and circuit breaker elements
on a removable circuit breaker truck in such man
This action is extended to include not only op
55 erations where the inductive winding may be dis
connected by manual or automatic switching
equipment but to operations where the inductive
winding is disconnected by disengagement of dis—
connect contacts through the operation of a truck
carrying ‘a circuit breaker in which case the re
, sistance 85 is connected in circuit with the in
ures 4 and 5, when the movable contact id of the
circuit breaker as is moved to open position, the
movable contact at or the ?eld switch M is moved
to closed circuit position.
The ?eld switch 5! comprises an upper sta
tionary contact 52 mounted on the circuit break
ductive winding 40 on the removal of the truck.
My invention also contemplates a cell having
er panel H and a lower terminal connection 55
also mounted thereon.
a switch thereon and a truck which when racked .
The movable contact structure of ?eld switch
into the cell disconnects the switch. In my 10 5| includes a contact 50 mounted on a contact
speci?c embodiment, the switch normally main
carrying arm 55. The contact carrying arm is
tains the resistance 85 across the inductance l5
and is operated to open this contact when the
truck is racked into the cell.
‘ Inasmuch as the main circuit breaker is al
ways in trip position during "the racking oper
connected by the lead 54 to the lower terminal
53. The contact arm 55 is pivotally mounted at
56 and is urged to a position wherein the con
15 tact surface 50 isin engagement with the sta
tionary contact 52 by the tension spring 51 which
ations, the auxiliary means which is mounted on
engages the arm 53 or arm 55.
the truck for closing the resistance circuit across
Another arm 60 mounted on the movable con
the inductance is in closed position prepared to
tact carrying arm 55 is pivotally connected'at
replace the switch in the cell when the truck is 20 M to the operating link 52. The opposite end
racked in.
of operating link 62 is provided with a slot as
Referring now to Figure 4, I have here sub
which engages a stud 84 on the circuit breaker
stantially shown a circuit breaker truck 80 racked
operating structure. When the movable con
into position in engagement with the elements of
tact surface 50 is in engagement with the sta
a switchboard cell structure 20. The showing 25 tionary contact 52 or the ?eld switch 5!, then a
of Figure 4 is entirely schematic and the actual
by-pass circuit through resistance 85 exists from
form anad exact operation of each of the elements
the ?eld winding 40 along conductor H to stud
therein shown will hereinafter be explained in
72, thence along conductor '83 to the stud or con
connection with the description of Figures 1 to 3.
tact 14; the ‘l. over the stationary lower discon
The circuit breaker and ?eld switch oper 30 nect contact 15 of the ?eld switch to the mov»
ating elements are mounted on a panel ll of in
able disconnect contact 18 mounted on the back
sulating material. The circuit breaker l3 com
connection stud ll of the circuit breaker panel;
prises a contact carrying arm [4 pivoted at l5
then to the contact 53 carried by the back con
and carrying the contact bridging element 18.
nection stud Tl, then through the lead 54 to the
The bridging contact 86 may be moved to closed 35 contact carrying arm 55 to the contact surface
contact position by the operating arm H which
rotates about its pivot 93 and is in toggle rela
tion with thelink It. The circuit breaker is
held in closed circuit position by the latch 23.
When the latch 23 is disengaged from the oper
55 thereof, then through the stationary ?eld
switch contact 52 mounted on the back connec
tion stud 80 to the movable disconnect contact at
in engagement with the stationary disconnect
contact 82 to the contact stud 83, thence over
ating arm I‘! in any suitable manner as, for
conductor 84, through the resistance 85, over con
instance, by the usual tripping coil (not shown)
ductors 85 and El to the winding 45.
or by manual operation, the toggle l‘i-l? is per
As has heretofore been pointed out, the link
mitted to break downwardly to the positionshown
62 interconnects the ?eld switch contact car
. in Figure 5, thus permitting circuit breaker con 45 rying arm with the operating elements of the
tact l6 to move to the left (with respect to Fig
circuit breaker i3 so that the stud 64, when the
ures 4 and 5) and thereby disengaging the mové
circuit breaker is closed, engages the lower end
able contact it from the stationary contacts to
of slot 53 to draw the link 62 in a counterclock
and 3|.
wise direction (with respect to Figure 4) to cause
The stationary contacts 3d and M are mounted
the contact arm 55 also to rotate counterclock=
on the front of the panel ii and are secured to
wise to disengage contacts so and 52 of the ?eld
back connection ‘studs 32 and 33 which respec
. tively terminate in disconnect contact elements
When the operating members ll of the circuit
35 and 36. These disconnect contact elements
breaker i3are moved to the open circuit position,
35 and 36 of the circuit breaker engage respec 55 as shown in Figure 5, then the stud 64 thereon,
tively with the stationary disconnect contacts 31
moves upwardly. thus permitting the link 62 to
and 33 in the switchboard cell 25 when the cir
move upwardly. The relaxation of the down
cuit breaker is racked into position.
ward force exerted by the stud 54 on the slot
Accordingly, when the circuit breaker is in
63 of the link 62 now permits the tension spring
position and the movable contact l6 thereof is in 60 51 of the ?eld switch contact arm 55 to cause the
engagement with its stationary contacts 30 and
?eld switch contact arm to rotate to closed .' cir
3|, current for the winding 40 of the motor or
cuit position.
dynamo ll, extending from a source of supply
It should here be noted that reliance is not
over conductor 9, passes through the disconnect
contacts 31 and 35, back connection stud 32, the 65 placed on the movement of the operating arm
upwardly when the circuit- breaker is open to
stationary circuit breaker contact 30, the mov
force the link 62 upwardly to close the ?eld
able bridging contact l5, the stationary con
switch, but rather slot 63 is of su?icient length
tact 3|, the back connection stud 33 and the dis
so that the spring 51 will be able to rotate the
connect contacts 36 and 38 to the opposite ter
minal 8 of the source of supply.
70 contact 50 of the ?eld switch to closed circuit
position before the circuit breaker is entirely '
Obviously, therefore, when the movable cir
cuit breaker contact I6 is moved to its tripped
The slot may be made of ~suifiicie'nt length, in
or open position, as shown in Figure 3, the cir
fact, so that the ?eld switch is permitted to close
cuit through the ?eld winding 40 of the dynamo
or motor 4| is broken. Also, as shown in Fig 75 at the moment that the circuit breaker movable
contact begins to open but before the contacts
that the circuit breaker and field switch elements
The slot 5t and stud 64 are so arranged with
are so arranged that when the circuit breaker
truck is in operative position in the switchboard
actually separate.
respect to the circuit breaker tripping operation
that on the instant when collapse occurs of the
linkage mechanism l9, as described above, and
the arm I‘! starts on its upward clockwise move
ment about its pivot 18, the pin 84 on the arm
structure, then:
1. The ?eld switch 5! and the auxiliary ?eld
switch |5l will be opened when the circuit break
er contacts are closed; and
2. When the circuit breaker contacts are open,
the ?eld switch 5| will close, thus connecting re
the slot 63 sufficient to permit the spring 51 to 10 sistance 85 across the coil 40.
rock the contacting arm 65 clockwise about its
3. When the circuit breaker truck is removed
pivot 56 into engagement with the stationary
from the cell, then auxiliary ?eld switch i5l is
contacts 52 and 53 before the movable contacts
closed, for purposes hereinafter set forth.
of the switch it have disengaged their stationary
4. As is hereinafter set forth, the movable con
contacts to and 8|.
tact it of the circuit breaker is intended to open
That is to say, upon the tripping operation be
before the circuit breaker is racked out of po
ing initiated, the ?rst movement which occurs
when the
as switch
of switch
50 and
it are
in the toggle mechanisms including H and the
movement of the link 552 permits a closing opera
opened ‘"efore racking out operations begin, the
tion of the switch contact 50 against the station 20 auxiliary ?eld switch lei is opened.
ary contact before the toggle movement has pro
As the circuit breaker is racked out of posi
gressed su?lciently far to disengage the contact
tion, the removal of rod mil permits auxiliary
Hi from its stationary contacts.
?eld switch liii to close. The disconnect con
My invention also provides for an auxiliary
tacts ti-M and "JG-‘i5 are so arranged that
11 moves a distance from the lowersurface of
?eld switch l5i which may be operated to con
nect the resistance 85 across the winding to when
the circuit breaker and ?eld switch operating ele
ments are entirely withdrawn from the switch
board cell.
This ensures that the resistance 35 is in paral
lel with the ?eld windings so both during closing
and opening operations, however these are to
be effected.
For this purpose, I provide a movable bridging
contact its on my auxiliary ?eld switch tilt, he
said contact being mounted in the stationary por
tion of the switchboard structure and being ar
ranged for operative engagement with the con
tact members 83 and “it.
- the auxiliary ?eld switch 65H may close before
these contacts are disconnected so that resistance
will always be across winding (til when the~
circuit breaker is intended to be open.
By this means a simple automatic method is
provided for placing a resistance across the ?eld
winding of a motor or dynamo immediately upon
the opening of the circuit to prevent damage
owing to a momentary rise in voltage.
Since this operation is automatic and requires
no separate manual manipulation, the safety
factor is greatly increased. Just preceding the
opening of the circuit for any cause, the re
sistance is automatically placed across the field
winding. This is so whether the circuit breaker
The movable contact bridging element lbil is (iii is opened automatically or manually. Should
mounted on the contact arm I55 which is pivoted
there be any attempt to rack out the circuit
at P56 and is urged into closed contact position
breaker, then, in addition to the means which
by the compression spring lb‘l. When the circuit
are provided to automatically trip the circuit
breaker and ?eld switch operating structure is re
breaker open, an auxiliary ?eld switch is pro
moved from the switch board cell, then spring [is vided to place the resistance across the ?eld
llil urges the movable contact i550 into bridging
engagement with the contacts Ni and as and thus
The primary purpose of the auxiliary switch
places the resistance 85 across the winding 4b,
115i is to ensure that where the resistance 35 is
the circuit being from winding is over conductor
utilized in connection with a number of circuit
‘ii to the stud ‘l2, thence over conductor ‘iii to
interrupters, this resistance will be in circuit to
the contact 14, over bridging contact the to con
protect the ?eld winding even though one or
tact 83, then over conductor 84 through resist
more of the circuit breakers may be withdrawn
ance 85 and conductors 86 and 81 to the wind
from its cell.
ing 40.
Thus, where one or more supply circuits are‘
A rod I60 is carried by the circuit breaker 56 utilized on the same load system, each of the
panel in the manner hereinafter shown and is
lines having its own circuit breaker, and where
so arranged that when the circuit breaker truck
a single resistance 85 is used to protect the field
is in operative position within the switchboard
winding of the load or motor; then, upon ‘the
cell, as shown in Figures 4 and 5, the rod I80 en
withdrawal of one of the circuit breakers from
gages the contact bridging element Hill to move
its cell while the others remain connected, it is
it out of engagement with the contacts 714 and 88.
important that the resistance 85 nevertheless be
Accordingly, when the circuit breaker truck
arranged to be connected across the ?eld upon
is in operative position, only the principal ?eld‘
the opening of the other circuit breakers.
switch Si is operative to connect or disconnect
Accordingly, auxiliary ?eld switch i5l, which
the resistance 85 across coil 40. When the cir 65 closes upon removal of the circuit breaker from
cuit breaker truck is racked out of position, then
its cell, produces this result.
the rod I60 is withdrawn from its engagement
This will be obvious from an examination of
with the movable bridging contact I50 or“ the
Figure '7 (where a slightly different auxiliary
auxiliary ?eld switch I51, and the spring I51
thereof can now urge the contact I50 into bridg
ing engagement with contacts 14 and 83, closing
the circuit in the manner above set forth. The
operation and utility of the auxiliary ?eld switch
will be hereinafter set forth.
From the foregoing, it may therefore be seen
?eld switch 45l is shown which, however, func
70 tions in. the same manner as auxiliary ?eld
switch l5! of Figures 1 to 3).
In Figure 7, all of the elements mounted on the
circuit breaker trucks Hi8‘ and I0b are the same
as the elements mounted on the circuit breaker
75 truck ID of Figures 1 to 3. The sole exception
2,412,293 1
is that the disconnect contacts "I, 482', 403 and
884 of the ?eld switch 5! are sliding contacts
which remain in engagement with each other
over a substantially greater movement than ob
circuit breaker, will establish the by-pass circuit
through the resistance 85.
Thus, by the use of the auxiliary ?eld switch
l5l (of Figures 1 to 3) or “I (of Figure 7). the
tains with the type of disconnect contacts utilized 5 removal of one of the circuit breakers from its
for the circuit breaker terminals. This will en
cell will nevertheless permit the resistance 85 to
sure that the ?eld switch 5| will be operative
protect the ?eld winding upon the tripping of
to connect the resistance across the winding 48
the remaining circuit breakers.
until the auxiliary ?eld switch til is closed. The
While this system has been described in con
auxiliary ?eld switch has a di?erent mechanical l0 nection with‘ two circuit breakers, it isaclear that,
form (hereinafter described) than auxiliary ?eld
with simple variations which should now be
switch fill of Figures 1 to 3; but operates in sub
obvious, it may be utilized with three or more
stantially the same mannerand has an‘ identical
circuit breakers. It is also obvious that, while‘
function. It bridges the terminals 83 and 14
two pole circuit breakers have here been shown;
. when the circuit breaker truck is withdrawn from 15
the system may, with obvious adaptations, b:
the cell.
utilized with any single pole or multi-pole circui
The circuit breakers here shown are two pole
circuit breakers having bridging contacts I6 and
One physical embodiment which my invention
iii‘ which are mechanically interlocked by the
may takeis shown in Figures 1 to 3.
member 2'“ to operate together.
In Figure 1, I have shown a circuit breaker
Generator m is connected through the circuit
truck Ill mounted on wheels 28!, 2|“ and racked
breaker mounted in truck I ll3 to energize the
out ofthe stationary switchboard cell 28. The
?eld winding 48 as follows: current ?ows from
side enclosing sheets of each of these members
the generator along conductor~8 to the closed
have been removed in order to show the oper
bridging contact l6, then to conductor ‘ll; then 25 ating elements.
through conductor 4“ to the ?eld winding 48
The cell 28 comprises a framework which in
and through conductors 81 and 9 to the closed
cludes upper and lower structural members 2“
bridging contact [6“, then through conductor
and H2 on each side of the cell and vertical
M8 to the generator.
structural members 2l3, 2“, H5 and 2l6. This
The current from generator I I lla also may ?ow 30 framework is covered on top, bottom and sides
through ?eld winding 48, when the circuit break
by suitable enclosing sheets. The front of the
er in truck I8b is connected and closed, over
cell 28 is closed by the front panel 211 of the
an exactly similar path.
a circuit breaker truck. The rear of the cell 28
Resistance 85 is connected across the winding
is closed by the removable ?anged panel 2|8.
48 as follows: the connection is made from the 35
A panel 220 of insulating material is mounted
left end of resistance 85 through conductor 84
between the vertical members 2l5 and supports
to the contact stud 83, then through the ?eld
the male stationary disconnect contacts 31 and
switch 5|a or auxiliary ?eld switch 45l (when
38 of the circuit breaker. These members extend
either of these switches are closed) to the con
through the panel 220 and are provided with
tact stud 14, then through conductor 13 to the 40 terminals HI and 222 for connection to an elec
contact stud 12, then through conductors ‘H and
trical circuit, which in the present instance is
4“ to the ?eld winding; through the ?eld'wind
intended to be the ?eld winding 40 of the motor
ing to conductors 81, 9a and M5 to the contact
4| or any other similar inductive circuit.
stud 14“, then through the ?eld switch 5|b or
The stationary male disconnect contacts 82
auxiliary ?eld switch 45la (when either of these . and 15 of the ?eld switch are also mounted on
switches are closed) to the conductor 88 to the
the panel 228. The terminals of these contacts
right end of resistance 85.
extend through the panel 220 and form respec
It will thus be seen that the ?eld switches are
tively the contact studs 83 and 14 (see Figures
in series; so that both must be closed to connect
1 and 3).
the resistance 85 across the winding 40.
50 Leads 84 and 13 are connected thereto to com
When the circuit breakers in trucks ill8 and
plete the resistance circuit in the manner which
Illb are both racked in and in closed position, then
has already been set forth.
current from both generators M8 and 4H!8
The contact member 83 may comprise a suit
energizes the winding 40.
‘ able plate of conductive material secured to the
Should a fault occur in the line circuit from, 55 back of the panel 228, as shown particularly in
say, generator “88 then the breaker in truck [Oh
Figure 3, in conductive relation with the ?eld
will be opened, thus closing the ?eld switch 5|b
in the manner previously described (should the
switch stationary disconnect contact member 82.
The member 82 may be secured by the bolt 23I
breaker in truck Illa also open, it may be re
to the angle member 230, which, in turn, is se
closed). The closing of ?eld switch 5|b thus 60 cured by the bolt 232 to the panel 220. A bolt 234
leaves the by-pass circuit through the resistance
passing through the angle member 230, and the
85 in such condition that it may be closed by
panel 220 may engage the plate 83, thus ?rmly
closing of ?eld switch 5|“ should the circuit
securing it to the panel 220 and ensuring the
breaker in truck Illa then be tripped.
conductive relation between the disconnect con
Should a fault occur in the load circuit, then 65 tact 82 and the contact plate 83.
both circuit breakers will be tripped and both
The lead 84 may be connected to the contact
?eld switches 5! will be closed thus connecting
plate 83 by a bolt 235 or in any other suitable
the resistance 85 across the winding.
When it is desired to rack out truck l0", while
The contact stud 14 is secured to ‘the back of
at the same time it is necessary to operate the 70 the panel 220 by being mounted on a back ex
motor ll from the generator Ml), then, the aux
tension of the stationary ?eld switch discon
iliary ?eld switch 45“ will bridge the contact
nect contact ‘I5.
studs ‘838 and 14“, thus leaving the by-pass .cir
It is also securely supported in position by the
cult in such condition that the closing of ?eld
switch brackets 248 of the auxiliary ?eld switch
switch 5|a (in truck l8“) , upon the tripping of its 75 operating arm hereinafter described.
The stationary disconnect contact 15 is se
cured by a bolt 24! to the angle member 242
dd. Stud 64 is mounted on a U-shaped bracket ‘
in a stud 245 to which the lead ‘it! may be con
that is, operating elements which are connected
to the members of pole 215 to operate the same
will cause the elements of pole 2T8 simulta
neously to operate by reason of their being united
2T2 (Figure 2) which is secured by bolts 213,
which is secured by the bolt 243,120 the front
2'73 to the insulated bar 214 which interconnects
or the'panel. Bolt 2“ passes through the angle
the two poles 215, 216 of the two-pole circuit
member 242 and the panel 220 and terminates 5 breaker here shown for simultaneous operation;
In this manner the stationary disconnect con
tact ‘l5 and the contact plate 74 may each be
connected through the angle member 242 and the 10 by the insulating bar 214.
bolt 2M to the lead '83.
The circuit breaker operating members H are
The circuit breaker truck lb (Figure 1) car
so arranged that the stud 6G will move down
ries the circuit breaker panel ii. The back con
wardly in a counter-clockwise position around the
nection studs 32 and 33 of the circuit breaker are
pivot i8 when the movable circuit breaker con
mounted on this panel to project beyond the is tact i6 is moved to closed circuit position.
back thereof. Stationary contact members 35
As will now :le clear, when the toggle ll col
and 381 (Figure l) of the circuit breaker are
lapses on its ?rst movement. the lug 54 is carried
mounted on the projections of these studs beyond
away from engagement with the bottom of the
the front of the panel it to engage with the
slot $3. This is immediately su?icient to rock the
movable bridging contact 86. The stationary 20 ?eld switch El under the action of its spring El in
contacts 3i} and 3% are not shown in Figures 1,
a clockwise direction about its pivot 56 to en
gage its stationary contacts 52 and 53—this occur
2 and 3 but are schematically indicated in Fig
ring before any opening of the main circuit
ures 4: to 16. These, of course, may take any
breaker E3.
conventional form which will enable them to
As the toggle’s action continues thereafter, the
cooperate with the bridging contact iii.
The back connection studs 32 and 33 terminate - main circuit breaker i3 disengages its contacts
moving to an open position and during this oper
in movable disconnect contact elements 35 and
ation the lug dd has moved to its position at
35 (Figure l) which, when the circuit breaker
which it engages the upper inner surface of the
is racked into position, engage with the male
stationary disconnect contact elements 3'! and 38, “ 30 slot 63 as shown in Figure 3, the toggle then being
in its completely collapsed position.
as previously described in connection with the
As the toggle mechanism ii is operated in a
schematic figures.
counter-clockwise direction about its pivot t8,
The field switch 5! (Figures -‘i, 2 and espe
the lug QM moves in the slot
and thus there
cially 3) comprises a contact carrying arm 55
is no effect during this ?rst portion of the move
which is mounted on the pivotal member 56
ment of the main switch. The closing operation
which, in turn, is supported by suitable brackets
of the main switch 23, therefore, continues to a
25E (Figure 2) on the panel ll of the circuit
point just before its contacts are engaged. At
breaker. ll‘ontact carrying arm 55 carries‘ a con
this point, lugrcd engages the lower surface of
tact member cfi'having a contacting face which
slot '56.
is engageable with an upper stationary contact
As the last ?nal locking operation on the main
52 and an arcing contact 260.
circuit breaker occurs, the lug 6%, in engage
Upper stationary contact 52 is mounted on and
ment now with the lower surface of slot “ill, will
operatively connected to the back connection
exert a pull on the link '52 which acts through
stud til, to which is securedthe movable dis
45 the pin St to rock the bell crank shaped ?eld
connect contact member 88,
switch arm 5b about its pivot 56 in a counterclocke
A lead 56 connects the contact member 5d to
wise direction to disengage its contacts.
the lower terminal 53 of the field switch, which,
Thus, operation of the ?eld switch 55 occurs
in turn, is secured in any suitable manner to the
to recluse its contacts before the main circuit
front end of back connection stud ‘IT on the back
50 breaker is opened to separate these contacts just
end of which is mounted the movable discon- _
after the main circuit breaker is closed-this
nect contact ‘16.
being effected by the free ‘play provided for the
The back connection studs 80 and T3 are spaced
lug 6% in the slot 63.
by the insulating member ‘262 on which is
The closing operation may either be performed
mounted the rod lSil.
55 manually or by means of a solenoid operated clos
The field switch 5! has a magnetic blow-out
ing device 2M (Figure l) which, by the link 282,
coil 263, one terminal of which is connected to
is connected to the operating members H.
the back connection stud Bil, the other terminal
A shunt trip 284 may also be provided for the
of which is connected to the plate 264 to which
circuit breaker connected by a link 285 to the
the arcing horn res is secured. The arcing horn 60 latch 23. '
carries arcing contact 260.
The slot
therefore, ensures that the ?eld
An are quencher 266 may be mounted in any
switch will not open until the circuit breaker
suitable manner ‘over the movable contacts
contacts are closed, while the ?eld switch will
‘id-El-i?b of the‘ ?eld switch.
close just before the circuit breaker contacts are
Contact carrying arm 55 of the ?eld switch has 55 fully separated during their opening movement.
an extension 58 to which is secured one end oi.’
The ?eld switch 5i operates, as previously set
the tension spring 5'5, the other end being se
forth in connection with the description of
cured at 2m to the circuit breaker panel ii.
Figures 4 and 5, when the circuit breaker is in
The spring 51 tends to rotate the contact carry
position in the switchboard cell.
ing arm 55 in a clockwise direction to bias the 70 When it is desired to rack the circuit breaker
switch toward a closing position.
out of the switchboard, then auxiliary field switch
An arm 50 on the contact carrying arm 55 is
l?i becomes operative. The circuit breaker panel
pivoted at 6| to the operating link 62. The op
it carries a tripping arm 3&8 which is engage
posite end of the link has a slot 63 therein
able with the roller 30! on one of the side sheets of
which is in operative engagement with the stud 75 tilt: (Kill. structure 20 (see Figure 1). The arm
300 has a chamfered surface 302-403 com
municating with the notch 304.
_ When the circuit breaker is in position in the
cell, the roller 30f in the cell engages the notch
As the racking out operation commences,
the movement of thecircuit breaker, truck, which
moves the arm 300 past the roller 30I, will cause
the arm 800 to rotate in a counterclockwise direc='
tion with respect to Figure 1 around its pivot’
305 as the‘ roller 30I enters the chamfered sur
face 300. This will cause the link 305 to be moved
downwardly, thus tripping the latch in the same
manner as does link 285 when the shunt trip 284 is
member 422 when their ends are secured by suit
able metallic washers and bolts 424. Metallic
current conducting members 425 are secured
against opposite surfaces of the insulating mem
her 422 by the bolts 424 and by any other suit
able means of securement as, for instance, the
screws 425.
The ends .of the conductors 425 are bent to
form retaining ?anges 421.
-A spring metal conductor 480 (on each side)
is secured at 43I in the end of the insulating sup
porting member 422; the opposite end of each
conductor 430 is urged by spring 432 away from
the support 422 so that the contacting faces 435
Thus‘, in the event that the circuit breaker has 15 may have suitable pressure to make a good slid
not been opened before it is racked out, it is
ing contact with the disconnect contact mem
tripped open on the initiation of the racking out
bers 440, 440. The free ends of the members-430
operation. The engagement of roller 30I with
are restrained in their outward movement in' re
surfaces 302 and 303 of arm 300 also serves to
sponse to the springs 432 by the retaining ?angesv
trip the ‘circuit breaker open, should it be racked 20 421. A current carrying connection between cone
into position while closed.
ductors 425 and contacts 430 is made by the pig
The racking operation herein set forth is shown
tails 442, each secured at one end by the screws
in Patent No. 2,237,367, assigned to the assignee of
425 and at the opposite end to thebolts 444 which
the present application.
guide and secure the springs 432.
Simultaneously, with the racking out of the 25
The upper contact 430 is thus electrically con
circuit breaker, rod I60 is moved out of engage
nected to the upper connection studtlla; and the
‘ment with the end of the plunger 3I0. Plunger
lower contact 430 is connected to the lower stud
3l0 is mounted in the panel 220 (see particularly
Figures 1 and 3) and is urged into movement to
The disconnect contacts 440 are each secured
ward the left by the compression spring 3I I. _ The 30 on suitable insulating supports 480 which ex
end of plunger 3I0 is in‘ engagement with the ad
tend from the insulating panel 45I mounted on
justment nut 3I2 on the end of rod I60. The
the rear wall member 220 of the cell. The bolts
rear end of the plunger 8I0 carries a member 3“,
455, which secure the insulatingpanel “I to the
which is engageable with the plate 3“, on the
insulating panel or wall member 220, also elec
operating arm I55 of the auxiliary ?eld switch 36 trically connect the ends of disconnect contacts
460 to their respective contact studs 833 and 148.
The operating arm I55 is pivoted at I56 on
The auxiliary ?eld switch 45| is a bridging
the brackets 240 on the rear of the panel 220 and ‘ member adapted to bridge con'tactsilila and 14B.
is urged in a counterclockwise direction by the
Member 45I is mounted on the end of plunger 410
compression spring I51 which is mounted at one 40 which passes through the opening 41 I in the panel
end in the panel 220 and at the other end bears
220 and opening 412 in panel 46L
against a pin 320 on the arm I55.
' Opening 41I is provided with an inner annular
When the circuit breaker truck I0 is in position
ledge 413 against which one end of a compressio
in the cell, the rod I60 engages the plunger M0
spring 415 bears. _
to push its member 3“ against the plate 3I5 45
The opposite end of the spring bears against
to rotate the arm I55 in clockwise position so
the end of a sleeve 411 mounted on the plunger
that the contact I50 is out of engagement with
the stationary contact members 83 and 14.
The spring 415 thus biases the contact mem
As the circuit breaker is racked out of position,
ber 45I toward engagement with contacts 83“
the rod I60 is withdrawn, thus permitting the 50 and 14"‘.
compression spring 3“ to move the plunger 3“)
When the circuit breaker is racked into posi
to the left, thereby permitting compression spring
tion, the end of member 422 bears against the end
I51 to rotate the contact carrying arm I55 in
of plunger 410 and forces the contact 45! out of
counterclockwise direction.
engagement with the contacts 83Ii and 143. When
This permits the bridging contact l50 to close on 55 the circuit breaker is racked out, then the spring
the stationary contacts 83-14, again connecting
415 is free to urge the contact member 45I into
theresistance 85 across the ?eld winding 40.
closed position thus closing the auxiliary ?eld
In Figure 8, I have shown a modi?ed form
of auxiliary ?eld switch 45I which corresponds in
The length of the disconnect contacts 440 is
function to the above described auxiliary ?eld 60 such as to ensure that. the ?eld switch 5ia will be
switch I5 I, and which already has been mentioned
connected in circuit with the resistance 85 and
in connection with the description of the schema
?eld winding during the racking out process
tic diagram of Figure 7.
at least until the auxiliary ?eld switch 45I is
In Figure 8. the circuit breaker operates in the
same manner as the circuit breaker of Figures
In the foregoing, I- have set forth a ?eld switch
1 to 3 and the ?eld switch 5Ia is identical with
coupled with an auxiliary ?eld switch for connect
the ?eld switch 5| of those ?gures. All other
ing a resistance across the ?eld winding of a
parts of he circuit breaker structure and its truck
dynamo. or in a similar inductive circuit, to pro
are identical with the parts previously described.
tect the device against momentary rise in voltage
The differences lie in the modi?ed form of auxil 70 which may occur on the breaking of the circuit.
iary ?eld switch HI and its associated parts.
The operation of each of the elements has been
The back connection studs 808 and 11a of the
described particularly in connection with sche
?eld switch pass through openings in the panel
matic Figures 4 to 6 and ‘also in connection with‘
II and through corresponding openings in the
the description of the individual elements of the
?anges 420 and 42I of the T-shaped insulating 75 apparatus of my invention.
Generally, the device is so arranged that when
the circuit breaker opens, the ?eld switch closes,
thus connecting a resistance across the ?eld wind
engageable from said member to close the same
when said panel is in another position; a switch
ing member on said panel in parallel with said
ing. After the circuit breaker is closed, the ?eld
switch is automatically opened. The ?eld switch
7 switching member on said back wall; said switch
and the circuit breaker are so arranged that the
?eld switch opens after the circuit breaker is
closed and so that the ?eld switch closes before
said circuit breaker is open; and disconect con
the circuit breaker is fully opened.
An auxiliary ?eld switch is provided and is
automatically operable to closed position when
the circuit breaker is racked out of the switch
board cell.
All of the operations connected with the switch
ing of a resistance in circuit across the winding
of the ?eld coil are automatic so that no addi
tional operations, manual or otherwise, need be
performed, and the equipment, as well as the
operator, is fully protected.
In the foregoing, I have set forth in schematic
form and in preferred embodiments various ele~
ments of my invention. Many variations and
adaptations thereof should now be obvious to
those skilled in the art. I, therefore. prefer to
be bound not by the speci?c disclosure herein
but only by the appended claims.
ing member on said panel being closed when
tacts between said two switching members estab
lishing the parallel connection therebetween;
said disconnect contacts being slidable contact
3. A circuit breaker, a panel for carying the
same, a cell for said circuit breaker, said cell
having a back wall; said panel being movable
toward and away from said back wall; said back
wall carrying a switching member; a plunger on
said panel engageable with said switching mem
ber to open the same when the panel is in one
position with respect to said back wall and dis
engageable from said member to close the same
when said panel is in another position; a switch
ing member on said panel in parallel with said
switching member on said back wall; said switch
ing member on said panel being closed when said
circuit breaker is open; and disconnect contacts
between said two switching members establish
ing the parallel connection therebetween, said
I claim:
disconnect contacts maintaining current carry
1. _A circuit breaker, a panel for carrying the
ing engagement during outward movement of said
same, a cell for said circuit breaker, said cell
panel until said plunger is completely disengaged
having a wall; said panel being movable toward 30 from the switch in the cell.
and away from ‘said wall; said wall carrying a
4. A circuit breaker, a panel for carrying the
switching member; means on said panel engage
same, a cell for said circuit breaker, said cell
able with said switching member to open the
having a back wall; said panel being movable
‘same when the panel is in one position with re
toward and away from said back wall; said back
spect to said wall and disengageable from said 35 wall carrying a switching member; a plunger on
member to_close the same when said panel is in
said panel engageable with said switching member
another position; a switching member on said
to open the same when the panel is in one posi
panel in parallel with said switching member
tion with respect to said back wall and disengage
' on said wall; said switching member on said
able from said member to close the same when
panel being closed when said circuit breaker is 40 said panel is in another position; a switching
open; and disconnect contacts between said two . member on said panel in parallel with said
switching members establishing the parallel con
switching member on said back wall; said switch
nection therebetween. ‘
ing member on said panel being closed when said
2. A circuit breaker, a panellfor carrying the
circuit breaker is open; and disconnect contacts
same, a cell for said circuit breaker, said cell
between said two switching members establish
having a back wall; said panel being movable to
ing the parallel connection therebetween; an in
ward and away from said back wall; said back
sulating support on said panel for the elements
wall carrying a switching member; means on
of the disconnect contacts carried thereby; said
said panel engageable with said switching mem
plunger being carried by said insulating support.
ber to open the same when the panel is in one 50
position with respect to said back wall and dis
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