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Патент USA US2404950

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July 3_0, 1946.
R. c. DICKlNsoN l-:T AL
2,404,950.l
>CIRCU'IT BREAKER
Filed sept. 15, 1942 ‘
2 sheets-sheet 1
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July 30, 1946-
R. c. DlcKlNsoN ET AL
2,404,950
CIRCUIT BREAKER
Filed sept. 15, 1942
171g. 3.
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BY
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ATTORNE
Patented July 30, 1946
2,404,950
UNITED STATES IPATENT OFFICE
2,404,950
CIRCUIT BREAKER
Robert C. Dickinson, Wilkinsburg, William H.
Stuellein, East McKeesport, and Fritz E. Flor
schutz, Wilkinsburg, Pa., assignors to Westing
house Electric Corporation, East Pittsburgh,
Pa., a corporation of Pennsylvania
Application September 15, 1942, Serial No. 458,358
18 Claims. (Cl. 20o-89)
l
This invention relates to circuit breakers and
more particularly to a high-speed circuit breaker
2
nism, said latch being operable by the operating
mechanism to close the breaker.
'
which is operated to automatically interrupt the
Another object of the invention is the provision
circuit as a result of reversal of the current in
the circuit controlled by the breaker.
'
of an improved circuit breaker operating mech
anism wherein the circuit breaker is held latched
in closed position by a holding magnet which
acts to hold a latch in a position to connect the
movable switch member to an operating member,
An object of the invention is the pro-vision of
an improved circuit breaker which is operated at
high speed to open the contacts and in which the
contacts are trip free oi the closing means.
Another object of the invention is to provide
an improved circuit breaker in which the support
frame for the breaker mechanism forms a part
the latch being operable by a relatively small
component of the opening bias of the breaker to
release the switch member upon a predetermined
reduction of the magnetic ilux.
of the magnetic circuit for the holding magnet.
The novel features that are considered char
acteristic of the invention are set forth in Dar
Another object of the invention is to provide a
circuit breaker with an improved trip mechanism 15 ticular in the appended claims. The invention
itself, however, both as to structure and opera
wherein a trip magnet core member forms a part
tion, together with additional objects and ad
of the magnetic circuit for a separately ener
vantages thereof, will be best understood from
gized holding coil.
the following detailed description of one embodi
Another object of the invention is to provide a
circuit breaker of improved construction which 20 ment thereof when read in conjunction with the
accompanying drawings, in which:
is safe and reliable in operation, and inexpensive
Fig. 1 is a side elevational view, partly in sec
to manufacture.
tion, of a circuit breaker embodying the principles
Another object of the invention is to provide
of the invention;
an improved circuit breaker wherein a pivoted
Fig. 2 is a fragmentary sectional View taken on
contact member is held in closed position by a 25
line II-II of Fig. 1 showing the structural fea
latch member pivoted eccentrically of the contact
tures of a portion of the magnetic structure of
member pivot and movable substantially radial
the trip electromagnet.
ly to said pivot to release the contact member.
Fig. 3 is a front elevational View of the circuit
Another object of the invention is to provide 30 breaker.
an improved circuit breaker with a novel latch
Fig. 4 is a fragmentary elevational view, partly
member which is movable longitudinally of itself
in section, of the breaker in the tripped open
to release a contact member and which is rotat
position.
able and longitudinally movable to reset posi
tion.
Another object of the invention is to provide a
circuit breaker with an improved latch structure
wherein a latch member which releasably con
nects a switch member to an operating member
is longitudinally movable to disconnect the switch
member from the operating member and where
in the latch member is rotatably and longitudi
nally movable to reconnect said switch member
to the operating member.
Another object of the invention is to provide 45
Fig. 5 is a detail sectional view taken on line
V-V of Fig. 1 showing the details of construc
tion and mounting of the parts on the contact
arm support shaft;
Fig. 6 is a sectional view taken on line VI-VI
of Fig. l showing the construction and mounting
of the holding coil.
Referring to Figs. 1 and 3 of the drawings, the
circuit breaker includes a separable contact struc
ture indicated generally at Il, an operating
mechanism indicated generally by the reference
character I3, a trip device I5, an arc blow-out
an improved operating mechanism for a circuit
breaker wherein a latch is movable by a trip de
vice to eiîect opening of the contacts, the latch
magnet I'I and an arc chute indicated generally
being movable by the operating mechanism to
breaker are mounted on a framework compris
at I9.
The several elements comprising the circuit
close the contacts.
50 ing a pair of spaced upright support'bars 2I of
Another object of the invention is the pro
insulating material. The bars 2I are rigidly con
vision of an improved operating mechanism for
nected at their lower ends by an angle cross
a circuit breaker wherein a latch is operable by a
member 23 and a cross bar 25 disposed across
trip device to effect opening of the breaker irre
spective of the position of the operating mecha
tical portion of the angle bar. The cross mem
the opposite edges of the bars 2I from the ver
el
ber 23 and the bar 25 are clamped tightly against
the support members 2| by means of bolts 2l
which are disposed on opposite sides of each of
the support members in order to maintain the
proper spaced relation between the upright sup
port bars.
The upper ends of the support bars 2| are
spaced apart and rigidly connected by means of
a casting 29 having a portion 3| integral there
with and extending transversely of the support
bars. The transverse portion of the casting 29
extends beyond the upright bars 2i and is rig
idly clamped thereto by means of bolts 53 dis
posed on opposite sides of each of the support
4
the movement in one direction of the rod 83
and the contact. A spring 8S coiled about the
sleeve 85 and compressed between the plate 59
and the arcing contact provides contact pressure
for the arcing contacts. A flexible shunt con
ductor 90 connects the stationary arcing contact
63 to the main stationary contact 6|.
The movable contacts comprise a main mov
able contact 9| and a movable arcing contact 93
(Figs. 1 and 4) carried on the upper end of a
pivoted contact lever 95 pivotally mounted on
a shaft 91 (Figs. 1, 3, 4 and 5) supported in the
frame plates 3l. The contact lever 95 comprises
a pair of levers rigidly connected at their up
members 2| and which cooperate with a cross 15 per ends by an integral cross member 99 to which
the arcing Contact 93 is secured by means of
screws mi. The main movable contact al is
secured directly to the levers 535. The contact
lever Sli is biased in a clockwise or opening di
rection by a pair of tension springs |93 (only
vice l5 are supported in a frame comprising a
one being shown) having one end hooked over
pair of spaced parallell side plates 3l of magnetic
a rod |65 mounted in the lower end of the con
material which, at their left hand ends (Fig. 1),
bar 35 and the portion 3| of the casting 29 to
rigidly secure the casting 29 to the support mem
ber 2| and to space these members apart.
The operating mechanism i3 and the trip de
tact lever and having their other ends anchored
are rigidly clamped to the upright supports 2|.
to spring studs iûl‘ projecting from the plates
The right hand ends (Fig. 1) of the side plates
3l are spaced apart and rigidly connected by an 25 3l. The contact lever gli is also biased to open
position by a pair of compression springs |99
angular cross member 39 secured to the side
threadedly mounted on screws ||| and support
plates 3l by means of screws (il. Referring to
ed 0n the bracket 3S.
Fig. 6 it can be seen that the side plates 3l are
The contact lever 95 is releasably held in the
clamped to their respective support members
2| by clamp plates ¿i3 disposed on the opposite 30 closed contact position by a latch member ||3
which is operated by the trip device l5 upon re
sides of the support members 2| from the plates
versal of the direction of current flow in the cir
3l, and securely held in place by bolts ¿l5 and lll.
cuit of the breaker, to release the contact lever
The plates 3l’ are supported at their right
and permit the springs |03 and |69 to operate it
hand ends by an insulating block 519 (Fig. 1)
to the open contact position. The latch mem
which is in turn supported on a channel-shaped
ber ||3 is rotatably mounted on a short tubular
member 5|, the block lle being secured to the
cross member 3l) by screws 53 and to the chan
nel member 5i by screws 55. A pair of spaced
angle members 5l (Figs. 1 and 3) are suitably
bearing H9 (Fig. 5) eccentrically surrounding
the shaft 9i and supported in one end of a lever
|2|. The lever |2| comprises a pair of spaced
secured, for instance by welding, to the angle 40 levers pivoted on a pivot pin |23 mounted in
the frame plates 3l. At its other end the lever
|2| carries an armature |25 pivotally supported
on a pivot pin |27 mounted. in the end of the
lever |2|. IThe armature |25 cooperates with
45 an electromagnet H5 to retain the latch mem
able base (not shown).
‘
ber ||3 in latching position as shown in Fig. 1,.
The casting 29 mounted on the upper ends of
and, as will be described later, the electromag
the upright supports 2|, has a vertically disposed
net operates upon the occurrence of reversal of
plate 59 cast integral therewith and forming a
current flow in the circuit of the breaker, to re
mounting for the stationary contacts of the
breaker. The stationary contacts comprise a 50 lease the armature. As shown in Figs. 1 and 5,
the internal diameter of the tubular bearingL | I9
main stationary contact member 53| and a sta
is substantially larger than the outside diameter
tionary arcing contact 63. The main stationary
of the fixed pivot shaft Sl. This permits the
contact (5| is mounted on a block 55 of conduct
tubular bearing H9 and the latch H3 mounted
ing material which is slidably mounted on four
cross-member 23 and to the channel member
5|, thus forming a rigid framework for sup
porting the operating mechanism. The entire
framework is adapted to be supported on a suit
stud bolts 6l (only two being shown) threadedly 55 thereon to move up and down relative to the
axis of the fixed shaft al. The tubular bearing
engaging the plate 59 and extending horizon
H9 is disposed eccentric to the íixed shaft Sl in
tally from the face thereof. Electrically con
the closed position of the breaker s0 that this
nected to the back of the block 65, and me
tubular bearing and the latch ||3 mounted
chanically secured thereto, is a pair of flexible
shunt conductors 69 each comprising, preferably, 60 thereon can move downwardly upon release of
the lever |2| by the tripping electromagnet.
a plurality of thin, ñexible strips of conducting
A latch member |29 (Figs. 1 and 4) is adjust
material. The flexible shunt conductors 59 are
ably secured by means of screws |3| to a cross
connected by means of bolts 1|, to opposite sides
bar |33 connecting the two levers S5 which form
of a conductor ‘i3 which is, in turn, secured by
means of screws l5 to a cross member 'Il of the 65 the contact lever. The force of the springs |û3
and |99 tending to rotate the contact lever 95
casting 29. A spring 19 compressed between the
clockwise, presses the lower beveled edge of the
plate 59 and the iiexible conductor 63 provides
latch member |29 against the upper left hand cor
contact pressure for the main contacts when
ner of the latch member H3 and tends to move
the breaker is closed. A spring guide 8| is pro
vided on the plate 59 to retain the spring la in 70 the latch member H3 in a clockwise direction
about the tubular shaft HG. This rotation of
place.
the latch member H3 1s normally prevented by
The stationary arcing contact (i3 is mounted
on one end of a rod 83 slidably mounted in a
means of a roller |35 mounted on a pin |31 sup
sleeve S5 secured in the plate 59. The other end
of the rod 83 is provided with a nut 8l to limit
ported in a closing lever E39. It will be noted that
the beveled latch surface of the latch member
2,404,950
5
|29 is inclined relatively to the longitudinal axis
of the latch member I I3. This results in a down
ward force on the latch member, which in turn
produces an upward force in armature |25. Mo
tion of armature |25 and therefore tripping of the
6
held in the position shown in Figs. 1 and 4 by
the over-center condition of the toggle |5|_-|43.
Referring particularly to Fig. 4, the contact le
ver 95 is rotated counterclockwise from its open
latch member I I3 is prevented by holding magnet
position to the closed position by operation of the
lever |43 which is accomplished by automatic
||5 until reversal of current as will be described
closing means (not shown) but which moves the
later.
link |51 downwardly to close the contacts. Be
The closing lever |39 is pivotally mounted on
fore the contacts may be closed, however, the
the shaft 91 (see Fig. 5) and is connected by 10 closing lever |39 must be retrieved and relatched
means of an adjustable link |4| to an operating
lever |43 which is pivotally supported on a shaft
to the contact arm. The retrieving movement of
the closing lever is effected by clockwise opera
|45 mounted in the frame plates 31. The upper
tion of the operating lever |43, the clockwise
end of the link |4| comprises an eye bolt |41
movement of the lever being limited by a stop
pivotally mounted on a pin |49 supported in the 15 |64 in the member 39.
free end of the closing lever |39. The other end
of the bolt |41 threadedly engages a yoke |5I,
the two legs of which are pivotally connected to
The clockwise or retrieving operation of the
lever |43 is automatically accomplished by means
of a retrieving spring |66 (Fig. 1) having one end
the lever |43 by means of a pivot pin |53. A
attached to the member 51 and the other end at
downwardly extending arm |55 of the lever | 43 20 tached to the link |51. The spring |66 biases
is pivotally connected to the upper end of a ver
the link |51 upwardly and biases the lever |43 in
tically disposed operating link |51, the lower end
a clockwise direction, however the tension of the
of which link may be connected to a power oper
spring |95 is not su?licient to move the tog
ated closing means (not shown). The link |4|
gle |4I--I43 overcenter against the force of
and the lever |43 form a toggle which, in the
the springs |93-|99. When the latch |I3
closed position (Fig. 1) is slightly overcenter to
is moved downwardly to release the contact le
the Ileiît of the center line |49-I45. In this po
ver 95 the pressure of the springs HB3-_|99
sition the force of the springs ID3-|99 transmit- '
is no longer applied to the toggle |4I--I43
ted through the contact lever 95, latch member
whereupon the spring |99 moves the link |51
||3, the closing lever |39 and link |4I, biases the 30 upwardly and rotates the lever |43 clockwise
lever |43 in a counterclockwise direction against
until it is arrested by striking the stop |94. Dur
a stop screw |59 mounted in the angle mem
ing the clockwise movement of the lever |43 the
ber 39.
toggle |4I-I43 is moved overcenter to the right
When the electromagnet | I5 operates to release
of the line I45---|49 to a collapsed position thus
the armature |25, the springs IUS-_|99 act to ro
rotating the closing lever |39 clockwise from the
tate the contact lever 95 clockwise to the open
position in which it appears in Figs. 1 and 4. As
position (Fig. 4), and due to the beveled or in
the closing lever I 39 is rotated clockwise, a cross
clined edge of the latch member |29 a component
pin |65 thereon engages the left hand edge of the
of the force of the springs causes the latch mem
latch member |I3 and rotates the latch member
ber ||3 to move downwardly substantially radi 40 therewith until it clears the latch member |29
ally relative to the shaft 91 rotating the lever I2!
whereupon the magnet I I5 attracts the armature
clockwise about its pivot |23. The latch I|3 is
|25 rotating the lever |2| counterclockwise and
thus disengaged from the latch piece |29 thereby
thrusts the latch member | I3 upwardly into latch
releasing the Contact lever 95 from the closing
ing engagement with the latch member |29.
lever |39 whereupon the springs |93-|U9 quickly
After the latch I |3 is reengaged with the latch
move the contact arm 95 to the open position
|29 it is held in its engaged position by the mag
shown in Fig. 4. The springs |99 are normally
net | l5 which is energized through the agency
compressed between the member 39 and spring
of the holding coil | |1, the holding coil ||1 being
pads IIB (only one being shown) projecting lat
energized independently of the current in the cir
erally from the lower ends of the contact levers 50 cuit of the breaker. The breaker may now be
95. The springs |99 serve to assist the springs
closed by rotating the lever |43 counterclock
|93 in moving the latch ||3 to unlatching posi
wise through the agency of the link |51 and the
tion and in starting the opening movement of
closing mechanism (not shown) to its position
the contact lever 95. The springs |93 complete
against the stop |59 (Figs. l and 4). This move
the opening movement after the springs |99 have z ment of the lever |43 straightens the toggle
reached the limit of their expansion as can be
|4|--| 43 and rocks the closing lever |39 counter
seen in Fig. 4. It will be noted that the movable
clockwise. rï‘his movement of the closing lever
contacts and contact arm 95 are tripped free of
acting through the roller |35 rotates the latch
the closing lever |39, i. e. the breaker will open
member ||3 and the contact lever 95 counter
when tripped even though the closing lever is held 60 clockwise to close the contacts and tension the
in closed position.
'
springs ID3-|09.
The shock of arresting the opening movement
Manual opening or tripping of the breaker may
is dissipated by shock absorbers ||2, there being
a shock absorber secured to the inner face of each
of the frame. plates 31 engageable by the spring
pads H9 as the contact lever 95 nears full open
position. The shock absorbers may be of any
suitable type preferably a spring biased plunger,
be accomplished by opening the energizing cir
cuit of the holding coil 293.
The electromagnet ||5 (Figs. l, 2 and 4) com
prises a plurality of laminated core members |51
each of which is provided with an air gap |69
(Fig. 2) and a smaller air gap |1| . The air gaps
or of any suitable resilient material.
As the contact lever 95 moves to open posi
tion the latch member |29 rides across the upper
|69 of the core members |61 are disposed alter
nately on the upper right and left hand corners
as indicated in Fig. 2. The core members |61
end of the latch member | I3 holding the latch
I|3, the lever |2| and the armature |25 in their
are suitably secured together to form a unitary
core for the magnet ||5, and are also secured to
end brackets |13 which are mounted between the
moved position (Fig. 4). During the tripping
action of the latch l| |3, the closing lever |39 is 75 frame plates 31 by means of bolts |15.
Each
2,404,950
8
of the core members |97 is provided with a cen
trally located opening |77 (Fig. 2) through which
passes a conductor comprising a pair of parallel
conductors |79 forming a part of the electrical
circuit of the breaker. At its left hand end the
conductor |79 is mechanically and electrically
connected by means of bolts |89 to the inner end
of a terminal connector |8|, and the right hand
end (Figs. 1 and 4) of the conductor |79 is suit
ably connected, for instance by brazing to a
yoke |93 (Figs. 1, 4 and 5) of conducting mate
rial. The yoke |93 has upwardly extending legs
|85 (Fig. 5) each provided with an opening
through which passes a sleeve |97 surrounding
the shaft 97 (see Fig. 5) and having inner flanged
ends disposed between the closing lever |99 and
the legs |95. The legs |85 of the yoke |83 are
disposed adjacent the inner sides of the contact
levers 95 and are held in intimate contact with
said levers by means of nuts |89 threaded onto
the outer ends of the sleeves |97 and having
spring Washers |9| disposed between the outer
faces of the levers and said nuts |99. Each yof
the nuts |89 is provided with a set screw |93
for locking the nuts in position after they have
been rotated on the threaded portions of the
sleeves |97 to provide the proper pressure con
tact between the legs |95 of the conductor yoke
|93 and the contact levers 95.
The electrical circuit extends from the termi- :_x
nal connector |92 through the conductor |79,
yoke |93, the legs |85 (Fig. 5) cf the yoke, con
tact levers 95, the main contacts 9|-9|, flexible
shunt conductors 99, conductors 73, through the
coil |9t of the blow-out magnet |7 to a terminal
connector |95.
As previously stated, the holding coil | I7 (Figs.
l and 6) is continuously energized from an inde
pendent source of energy and normally produces
sufficient flux in the magnetic circuit to hold the „
armature |25 in attracted position. The hold
ing coil | |7 comprises a core member |97 (Fig. 6)
of magnetic material having one end threaded as
at |99 to receive a nut 29|, also of magnetic
material, and an energizing coil
ing the core member.
surround- ~- Ll
After the coil 293 and
the nut 29| are assembled on the core member
|97, the assembly is inserted between the mag
netic frame plates 97 adjacent the support bars
the conductor |79 reverses its direction. The
holding flux between the armature |25 and the
magnet H5 is thus reduced to such a value that
the armature is released and the springs |93--|99
move the contact lever to open position.
The nut 97 on the left hand end of the arcing
contact rod 83 (Fig. 1) is spaced slightly to the
left of the portion 59 of the casting 2.9 in the
closed position of the contacts so that when the
Contact lever 95 moves to open the contacts, the
main contacts Eil-9| will ñrst separate and then,
a very short time later, the arcing contacts
63-93 will open drawing the arc between the
arcing contacts. The arc resulting from the ñow
of the current after the contacts have separated
is drawn into the arc extinguisher |9 by means
of the blow-out magnet |7 Where it is extin
guished. The blow-out magnet comprises the coil
|94, connected in series relation in the circuit
of the breaker, and a U-shaped core member 299
of magnetic material supported on the casting 29
and insulated from the coil |94. The legs of the
core members 299 are supported by vertically dis
posed insulating bars 2| | having their upper ends
secured by means of screws 2|.3 to the legs of
the core member 269, the lower ends of the sup
port bars 2| | being supported on the frame plates
37 and secured thereto by screws 2 I5.
The arc extinguisher is of the slotted plate
type and the current of the arc drawn thereinto
is shunted around the contacts and the breaker
operating mechanism to the terminal connection
|S| by means of a shunt circuit shown in part
at 2|7 (Figs. 1, 3 and 6). rThis prevents the iiow
of current through the various pins, bolts and
latches, which might damage them.
The arc extinguisher is preferably of the type
fully disclosed and claimed in United States Pat
ent No. 2,242,905, issued May 20, 1941, to R. C.
Dickinson and R. H. Nau, and assigned to the
assignee of the instant invention.
From the foregoing description it will be ap
parent that there is provided an improved cir
cuit breaker of novel construction which is op
erated to open position at high speed in response
to abnormal conditions and in which the con
tacts are trip free of the closing means. It will
also be seen that the trip device comprises a hold
2| (Figs. 1 and 6) and a retaining bolt 295 is
ing magnet having a magnetic circuit which in
cludes the frame members -for supporting the
inserted through openings in the support bars
2|, the frame plates 37 and the core member.
‘breaker operating mechanism.
Having described the preferred embodiment of
The nut 29| is then rotated in a direction to force
the end of the core member |97 and the nut
into intimate contact with the adjacent frame ¢
plates 57. Nuts 297 0n the threaded ends of
the retaining bolt 295 are then tightened to re
the invention in accordance with the patent stat
utes, it is to be understood that various changes
and modiñcations may be made in the structural
details disclosed without departing from some of
the essential features of the invention. It is,
tain the holding magnet assembly in place. It
therefore, desired that the language of the append
will thus be seen that the trame plates 37 form
ed claims be given as reasonably broad interpre
a part of the path for the magnetic ilux of the Ct tation as the prior art permits.
holding magnet i i7, the iiux passing through the
We claim as our invention:
core member |97, one of the frame plates 37,
1. In a circuit breaker, relatively movable con
the core members |97 and armature |25 of the
tacts, a switch member mounted on a iixed pivot
magnet H5, and through the other frame mem
and movable to open and close said contacts, op
(i5 erating mechanism for said switch member in
ber 37 back to the core member |97.
When the current is ñowing in the proper
cluding an operating member operable to eiïect
direction in the circuit of the breaker including
closing movement of said switch member, a latch
the conductor |79, the magnetic flux produced
member having its free end interposed between
by the holding coil ||7 in the magnetic circuit
the switch member and the operating mem-ber
and through the core members |97 and armature 70 for connecting said switch member to said oper
|25 is in the same direction as the magnetic flux
generated in the trip magnet |
by the conduc
tor |79. However, when the direction of cur
rent flow in the breaker circuit is reversed the
magnetic flux of the .trip magnet | |5produced by
ating member, said latch being supported in
dependently of said operating member and said
switch member, a trip device including electro
responsive means normally restraining said latch
in latching position and being operable in yre
2,404,950
10
' 9
sponse to predetermined circuit conditions to
cause said latch to be moved to unlatching po
to effect opening movement of said switch mem
ber.
sition to thereby effect opening of said contacts.
6. A circuit breaker comprising relatively mov
2. In a circuit breaker, relatively movable con
tacts, a switch member mounted on a fixed pivot
and movable to open and close said contacts,
operating mechanism for said switch member in
cluding an operating member movable to eiîect
closing movement of said switch member, means
interposed between said switch member and said 10
operating member for releasably restraining said
switch member in closed position, said means be
ing supported independently of said members, a
holding electromagnet structure for holding the
restraining means in restraining position, said
holding electromagnet being operable in response
to predetermined circuit conditions to permit lon
able contacts, a switch member movable to open
and close said contacts, operating mechanism for
said switch member including a lever for operat
ing said switch member to closed position, a latch
member connecting the switch member to the
operating lever to releasably restrain said switch
member in closed position, means for pivotally
supporting said latch member, said support
means being operable in response to reversal of
current in the circuit to effect longitudinal move
ment of said latch member to release said switch
member, and said latch member being pivotally
movable with said operating lever to effect clos
ing movement of said switch arm.
7. A circuit breaker comprising relatively mov
able contacts, a pivoted switch arm movable to
open and close said contacts, operating mech
anism for said switch arm including an operating
said restraining means being operable by said
lever pivoted coaxially with said switch arm and
operating member to move the switch member to
operable to effect movement of said switch arm to
closed position.
closed position, a movable latch having an end
3. A circuit breaker comprising relatively mov
able contacts, a switch member movable to an 25 interposed between said switch arm and said op
erating lever to releasably connect said switch
open and to a closed position to open and close
arm and said operating lever, means independ
said contacts, operating mechanism for said
ent of said switch arm and said operating lever
switch member including a member pivoted co
for supporting said latch for longitudinal move
axially with said switch member operable to ef
rect closing movement of the switch member, 30 ment to an unlatching position means biasing
said switch arm to open position and biasing said
means for restraining said operating member in
latch to unlatching position, and a holding mag
closed position, a member supported independ
gitudinal movement of the restraining means to
a. non-restraining position to thereby permit
opening movement of the switch member, and
ently of said operating member and extending
between the switch member and the operating
member for normally connecting the switch mem
ber to said operating member, and a holding
magnet for holding said connecting member in
connecting position, said holding magnet being
net for holding said latch in latching position
and operable in response to reversal of current
in the circuit to permit said biasing means to
move said latch to unlatching position and to
move said switch arm to open position.
8. A circuit breaker comprising relatively mov
able contacts, a switch arm biased to open posi
operable in response to predetermined circuit
conditions to permit movement of said connect 40 tion and movable to open and close said contacts,
an operating member, a pivoted latch having its
ing member from between the switch member and
free end normally interposed between said switch
said operating member to permit opening move
arm and said operating member for restraining
ment of the switch member irrespective of the
said switch arm in closed position, means’ sup
position of the operating member.
porting said latch independently of said switch
e, A circuit breaker comprising relatively mov
arm and said operating memb-er, a holding mag
able contacts, a switch member pivoted on a fixed
net for holding said latch in restraining position,
pivot biased to open position and operable to open
said holding magnet being operable in response
and close said contacts, operating mechanism for
to predetermined circuit conditions to release
said switch member including a lever movable to
said latch, means on said switch arm for moving
effect closing operation of said switch member, a
said latch longitudinally from its position be
latch member supported separately from said
tween said switch arm and said operating mem
switch member and said operating lever and eX
ber, means to operate said operating member to
tending between said lever and said member for
eiïect pivotal resetting movement of the latch,
releasably connecting the switch member to the
said holding electromagnetic means actuating
operating lever, said latch being biased to un
said latch to its position between said switch arm
latching position, means including an electro
and said operating member while said switch arm
magnet for holding said latch member in latch
is in open position.
ing position, said holding electromagnet being
9. A circuit breaker comprising relatively mov
operable in response to predetermined circuit
able contacts, operating means therefor, a mem
conditions to permit movement of said latch
ber interposed between the operating means and
member to unlatching position to effect o-pening
the movable contact to restrain said movable con
movement of the switch member.
tact in closed position, a frame for supporting
5. A circuit breaker comprising relatively mov
said operating means, a trip device including a
able contacts, a switch member biased to open "'~ trip member for pivotally supporting said re
position and movable to open and close said con
tacts, operating mechanism for said contacts in
cluding a member operable to elîect closing of
said contacts, a pivot-ally and longitudinally mov
able latch member having its free end disposed
between the switch member and said operating
member for releasably connecting said switch
member and said operating member, means oper
able in response to predetermined circuit condi
tions to cause withdrawal of the latch member
straining member, and electromagnetic means for
holding said restraining member in restraining
position and operable in response to predeter
mined circuit conditions to permit longitudinal
movement of said restraining member from be
tween said operating means and said movable
contact, said supporting frame forming a part of
said electromagnetic means,
10. In a circuit breaker- comprising a support
ing frame for supporting the breaker mechanism,
2,404,950
il
12
for normally connecting said switch arm and
said operating member, a trip member support
ing said latch for rotary and substantially radial
movement relative to the pivot ci said switch
arm and said operating member, and electro
responsive means operable in response to prede
relatively movable contacts and operating mech
anism for said contacts, a trip device including a
latch member connecting the movable contact
and said operating mechanism for restraining
said movable contact in closed position, a trip
member for pivotally supporting said latch mem
ber and operable to permit longitudinal move
ment of said latch member to a non-restraining
termined circuit conditions to eiîect radial move
ment of said latch to disconnect said switch arm
from said operating member irrespective of the
position of said operating member.
l5. A circuit breaker comprising relatively
position, and electromagnetic means including
said supporting frame for holding said trip mem
ber against tripping movement, said electromag
netic means being responsive to predetermined
circuit conditions to release said trip member.
movable contacts, a switch member movable to
open and close said contacts, operating mecha
nism for said switch member including a. mem
11. In a circuit breaker including spaced sup
ber operable to effect movement of said switch
porting frames of magnetic material for support_
member to closed position, a latch' member having
ing the breaker mechanism, a trip device includ
one of its ends interposed between said switch
ing a latch member operable to eiiect opening of
member and said operating member to releasably
the breaker, a trip member for pivotally support
connect said switch member and said operating
ing said latch member and operable to actuate
said latch in a longitudinal direction to a non 20 member, biasing means at all times biasing said
switch member to open position, auxiliary bias
latching position, an electromagnet for holding
ing means for biasing said switch member in
said' trip member against tripping movement and
opening direction during at least a. portion of the
operable in response to reversal of current in the
opening stroke, and a holding magnet for re
circuit to release said trip member, said electro
straining said latch in latching position and op
magnetic having a magnet core mounted be
erable to permit said biasing means to move the
tween said spaced supporting frames, and a hold
latch longitudinally to unlatching position and
ing electromagnet having a core member mount
to move said switch member to open position.
ed between said spaced supporting frames for
16. A circuit breaker comprising relatively
energizing said ñrst named electromagnet, said
supporting frames forming a part of the mag
30 movable contacts, a switch member movable to
netie circuit for said holding electromagnet.
l2. In a circuit breaker, the combination of
relatively movable contacts, a pivoted switch
member biased to open position and movable to
open and close said contacts, operating mecha
nism for said switch member including a member
operable to eiiect movement of said switch mem
ber to closed position, a latch member interposed
between said switch member and said operating
open and close the contacts, an operating meni
member to releasably connect said switch mem
ber pivo-ted coaxially with said switch member
ber and said operating member, spring means
and operable to effect movement of said switch
biasing said switch member in opening direction
member to closed position, a latch connecting the
and biasing said latch to unlatching position,
switch member and said operating member to re
leasably restrain said switch member in closed 40 said spring means being operable to move said
switch arm to full open position, auxiliary spring
position, a trip member for supporting said latch
means biasing said switch member in opening
for pivotal and longitudinal movement relative to
direction and biasing said latch in unlatching
said switch member, and an electromagnet for
direction at least during the unlatching portion
holding said trip member and said latch in re
straining position, said holding electromagnet 45 of the opening movement of said switch member,
and a holding magnet for holding said latch in
being operable upon reversal of current in the
latching position and operable to permit said
circuit of the breaker to permit longitudinal
biasing means to move said latch to unlatching
movement of said latch to effect opening move
position and to move the switch member to open
ment of the switch member.
13. In a circuit breaker, the combination of a 50
pivoted switch member movable to open and
closed positions, operating mechanism for said
switch member including a lever pivoted coax
ially with said switch member and operable to
position.
17. A- circuit breaker comprising relatively
movable contacts, a switch member movable 'to
open and close said contacts, operating mecha
nism for said switch member including a member
move said switch member to closed position, a `trip
device including a trip lever, a latch' member
pivo-tally supported on said trip lever and having
one end interposed between said switch member
and said lever for normally connecting said
switch member and said operating lever to re
strain said switch member in closed position, and
a holding electromagnet including an armature
carried by said trip lever for holding said latch
operable t0 effect closing movement of said
switch member, means interposed between the
switch member and said operating member for
releasably restraining said switch member in
closed position, means biasing said switch mem
ber to open position, said biasing means acting
through' said switch member to bias said restrain
in connecting position, said holding electromag
means in restraining position and operable to
permit said biasing means to move said restrain
ing means to non-restraining position and to
move said switch member to open position, a, part
of said biasing means being eiîective to bias said
switch member to open position only during a
net being operable in response to reversal of cur
rent in the circuit of the breaker to release said
armature and permit longitudinal movement of
said latch to release the switch member.
14. In a circuit break-er, the combination oi
relatively movable contactsJ a pivoted switch arm
movable to open and close said contacts, an op
erating member pivoted coaxially with' said switch
arm and operable to move said switch arm to
close the contactsy a latch pivoted eccentrically
of said switch arm and said operating member
ing means to a non-restraining position, and a
holding magnet for holding said restraining
portion of the opening movement of said switch.
member.
18. In a circuit breaker, the combination of a
pivoted switch member movable to open and
closed positions, means biasing said switch mem
ber to open position, operating mechanism for
13
2,404,950
said switch member including a lever pivoted co
axially with said switch member and operable to
move said switch member to closed position, a
trip device including a tripping lever pivoted at a
point spaced from the axis of rotation of said
closing lever, a latch rotatably mounted on said
tripping lever about an axis adjacent the axis
of said operating lever, means connecting said
latch for movement with said operating lever, a
latch element on said switch member engageable 10
by said latch to connect said switch member and
said operating lever, the engaging surfaces of said
latch element and said latch being disposed so
14
that the opening force on said switch member
tends to move said latch and tripping lever to
released position to release said switch' member
from said operating lever, and magnetic means
for normally holding said tripping lever and latch
in latching position, said magnetic means being
operable in response to predetermined abnormal
conditions to permit said latch and tripping lever
to move to released position.
ROBERT C. DICKINSON.
WILLIAM H. STUELLEIN.
FRITZ E. FLORSCHUTZ.
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