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Патент USA US2132627

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Oct. 11, 1938.
J. G. JACKSON
2,132,627
CIRCUIT BREAKER
Filed May 2, 1936
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3 Sheets-Sheet l
INVENTOR
Jb/zrz 6.5126160”.
BY
A TTORNEY
Oct. 11, 1938.
J. G. JACKSON
2,132,627
CIRCUIT BREAKER
Filed May 2, 1956
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Oct. 11, 1938.
J, G_ JACKSON
7 2,132,627
CIRCUIT BREAKER
Filed May 2., 1936
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Patented Oct. 11, 1938
2,132,627
UNITED STATES
PATENT OFFICE l
2,132,627
CIRCUIT BREAKER
John G. Jackson, Detroit, Mich, assignor to
Square D Company, Detroit, Mich, a corpora
tion of ~Michigan
Application May 2, 1936, Serial No. 77,519
30 Claim. (Cl. 200-168)
This invention relates to devices for making
and breaking electrical circuits and more par
ticularly to circuit breakers automatically op
erable in response to current overload.
5
One object of the invention is to provide an
improved form of arc chamber for an electric
circuit breaker of either single or multi-circuit
form.
Another object of the invention is to provide
[0 an electric circuit breaker-with an improved are
barrier having a restricted slot closely receiving
and guiding a movable switching member.
Another object of the invention is to provide
an improved contact assembly plate in a multi
5 circuit circuit breaker.
Another object of the invention is to provide
an improved sealing means for a circuit breaker
minimizing blowing out of arc gases and improve
the dielectric characteristics.
30
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,
‘’
As shown, the circuit breaker comprises. an
enclosure having a cup-shaped insulating base I
having a cover 2 sealably secured thereto as by 5
rivets 3. A partial wall 4 is disposed substan
tially centrally of the interior of the base 4 and
is provided with a central cutout portion receiv
ing a contact plate 5. A ?bre liner 6 is disposed
in this cutout portion beneath the contact plate 10
and the plate and liner are rigidly held in posi
tion by stud ‘l threaded into the plate. The
plate is provided adjacent its corners with
pressed up portions to which are secured the
stationary contacts 8 and between the adjacent 15
contact supporting portions is provided with
openings 9 for the release of are gases. Coop
crating with the stationary contact surfaces 8
are four individual ?oating contact bars H car-A
Another object of the invention is to provide ' rying contact surfaces 12 at one end adapted to 20
an improved form of magnetic yoke for a multi
engage and disengage their cooperating sta
circuit circuit breaker.
tionary contacts. The bars II are latched at
Other objects and features of the invention their opposite ends by bimetallic members l3
will be readily apparent to those skilled in the adjustably supported on connectors l4 leading
art from the following speci?cation and ap
to the exterior of the circuit breaker enclosure. 25
pended drawings illustrating certain preferred Flexible leads [5 interconnect the free ends of
embodiments of the invention in which:
the bimetallic members l3 and an intermediate
Figure 1 is a front view of a multi-circuit point on the cooperating bars I I. Compression
circuit breaker according to the present inven
springs l6 bias the bars ll against their respec
tion having a portion of the cover broken away tive stationary contacts 8 and bimetallic latches 3@
to show internal parts.
Hi. The top edges of the bars i i are provided
Figure 2 is a sectional view taken on the line with notches ll received within partial slots iii
11-11 of Figure 1.
in one of the legs of rectilinear movable mem
Figure 3 is an enlarged sectional view taken bers I9 generally U-shaped in cross section. The
on the line III—-III of Figure 1.
other legs of the members l9 are considerably 35
Figure 4 is a partial sectional view taken on shorter than those in which the slots l8 are lo
the line IV—IV of Figure 3.
cated and are adapted to engage within notches
Figure 5 is a partial sectional view taken on 2| in the top edges of the bars llv to restrict
the rotary movement of the bars to be herein
the line V—V of Figure 4.
Figure 6 is a detail perspective view of the after described. The members iii are guided 40
for rectilinear movement at right angles to the
contact plate.
‘
Figure '7 is a partial front view with the cover bottom of the base by suitable guides therein.
Operating handles 22 are pivotally mounted on
removed of a modi?ed form of the invention,
shafts 23 and have interior cam surfaces 24 in
utilizing the magnetic yoke.
Figure 8 is a sectional view taken on the line
VIII—VIII of Figure '7.
Figure 9 is a sectional view taken on the line
IX-JX of Figure '7.
0
ment or further development of the invention
disclosed therein.
'
The circuit breaker as herein illustrated and
described embodies the main structural and op
erating features of that described in appllcant’s
copending application, Serial No. 36,247, ?led
August 15, 1935, entitled Circuit breakers, and
5 the present invention constitutes an improve
cluding ?at portions 25 and resetting tips 26. 45
It can readily be seen that rotation of the handle
22 will cause the cam surface 24 to slide over
the top face of the member H to cause a rec
tilinear movement thereof. A spring 21 is pro
vided on the handle to provide a definite position 50
when the contacts are engaged as at the right in
Figure 2. The operating features of the handle
are more fully described in applicant’s copending
application, Serial No. 72,035, filed April 1, 1936.
The are chambers formed between the general- 55
2
2,132,627
1y central wall 4 and the side walls of the base
are provided with ?bre liners 28 generally U
shaped in cross section, and extending to the liner
5 in the middle and beyond the liner to the top
of the walls 4 at one side.
At the opposite side
the liners 28 extend considerably beyond the
contact plate 5.
To enclose these chambers from the oper
ating mechanism barrier walls 29 are provided.‘
10 These walls are removably received in notches in
the side and bottom walls of the base and the
central wall 6 and are themselves centrally
notched to clear the wall ll. These barrier walls
29 are provided adjacent their bottom portions
with restricted slots 3| closelyv receiving‘ and
guiding the bars i i. Within the arcing chambers
formed by the liners 28 and the barrier walls 29
are disposed partial transverse plates 32 support
ed by tongue and slot connections with the side
walls of the liner 28. The plates 32 are provided
with slots 33 through which the movable con
tacts i2 pass in their movement to engage and
disengage the stationary contacts 8.
a
The cover 2 is provided with enlarged openings
34 receiving but having their edges spaced from
the operating handles 22 and beneath the cover
2, which may be of metal if desired, is disposed a
thin insulating sheet 35 of ?bre or other material
serving to separate the cover from direct contact
30 with the base. The insulating sheet 35 is pro—
vided with restricted openings smaller than nec
essary to receive the handles 22 and the edges of
these openings are resiliently pressed inwardly as
at 36 to closely embrace the handles 22 to
minimize the blowing out of arc gases from the
The circuit breaker unit shown at the right in
Figure 2v is in the contact engaged position. To
manually move the contacts to "off” position the
40 handle is rotated to engage the ?at surface 25
with the top of the member l9 whereupon the
parts assume the position shown in reverse at
the left‘in Figure 2 with the movable contact i2
To
45 move the contacts again into engaged position the
handle is moved to its original position where
upon contact i2 moves into engaged position.
Upon the occurrence of an overload current
through any breaker unit the corresponding bi
metal will become heated and will bend toward
the end of the base, thus unlatching the corre
sponding end‘ of the bar I! which then rotates
under the bias of its spring i6 about the pivot
point formed‘ by the engagement of the notch i1
inthe top of the slot l8 in the member i9. This
rotary movement continues until the notch it
engages the shorter leg of‘ the member I9. In
this tripped position the member l9 will move
upwardly and will rotate the handle 22 beyond
60 the “on” position against the bias of the light
spring 21 into a position indicating the tripped
position of the corresponding breaker unit. To
reset the breaker mechanism, the handle is ro
tated beyond the “off” position, whereupon the
resetting tip 26 on the handle pushes the mem
ber l9 beyond the position shown at the left in
Figure 2 so that by the engagement of the con
tact carrying end of the bar H with the bottom
of the arc chamben the latching end will be
70 moved beyond the bimetal l3, whereupon by re
lease of the handle it will again move into latched
position. This operation is more fully described
and claimed in the aforementioned copending
applications.
75
which are substantially blocked oil from the
operating mechanism. Upon the occurrence of
an arc between a pair of cooperating contacts
the gases generated will move into the relatively
large open space above the contact plate 5
through the opening 5 and through the space
at the sides of the contact plate. The slots 33
in the plate 32 appear to have a bene?cial effect
in quenching an are drawn between the cooper
ating contacts as the movable contact 12 passes
therethrough.
The midportion of the plate
serves as a de?ector for the products of any are
which may be drawn. It is noted that the con
ducting parts within the arc chamber can con
tact only the ?bre or other special are resisting
material which greatly improves the dielectric
characteristics of the circuit breaker. The in
sulating sheet 35 prevents leakage from the base
i or the handle 22 to the metal cover 2 and
further minimizes the blowing out of arc gases
at the handle opening as it can be seen that any
gases reaching the handles will serve to press
the ?aps 8'6 against the cooperating handle sur
faces to more effectively seal the opening.
Figures '7 to 10, inclusive, show a modi?ed form
of arc chamber for the same circuit breaker oper
ating mechanism as that shown in the preferred
form of the invention. Here the contact plate
45 is similarly supported on a central wall 44 by
a stud Ill threaded into the plate. The barrier
walls 29 may be omitted if desired and the bar
il guided between projections on the side walls
of the base and the central wall as shown.
Against the walls 56 and the side walls of the base
are disposed magnetic yokes 48 having elongated
handle openings.
separated ,from the stationary contact 8.
ments are enclosed within common are chambers
It is seen that the opposite circuit breaker ele
side walls extended along the walls 44 and the
side walls of the base and having a central con
necting portion (39 received within a'correspond
ing recess in thebottom of the base. A ?bre
plate 5! may be provided over the connecting
portion £39 to insulate it from the contact carry
ing ends of the bars II more particularly in their
resetting position. A ?bre piece 5| of inverted
U-shape has its legs engaging the front edges of
the yokes 68 to hold them in place and the ?bre
piece 5! may be held in place by nut 52 on the
stud All. This ?bre piece is provided with open
ings 53 above the openings in the contact plate
to provide passage of arc gases. The ?bre piece
5! may also be provided with notches 54 to pro
vide clearance for the upper edge of the bars II.
In this form oi’ applicant's invention it is seen
that the opposite circuit breaker units have com
mon magnetic side walls which may be provided
with the joining portion adjacent a mid point.
The magnetic effect produced by the above de
scribed magnetic yoke aids in blowing out any
arcs formed between the cooperating contacts as
they are separated.
While certain preferred embodiments of the in
vention have been speci?cally disclosed, it is
understood that the invention is not limited
thereto as many variations will be readily appar
ent to those skilled in the art and the invention
is to be given its broadest possible interpretation
within the terms of the following claims:
What is claimed is:
1. In an electric circuit breaker, electrically
connected stationary contacts, movable contact
members extending in opposite directions from
said stationary contacts, said members carrying
contact surfaces adjacent one end cooperating
with said stationary contacts, U-shaped ?bre lin
er means alongside the contact surfaces on said
2,132,027
members, and fibre plates at opposite ends‘df said
stationary contacts having slots therein receiving
and guiding said members, said liner means and
opposite plates defining an arcing chamber com
mon to both of said stationary contacts andthe
movable contact surfaces cooperating therewith,
whereby arc gases incident to an arc drawn be
tween either cooperating pair of contacts and
contact surfaces are generated within the com
mon chamber.
‘
2. In an electric circuit breaker, a stationary
contact plate having ‘spaced contact surfaces
mounted thereon, oppositely extending movable
switching members having contact surfaces at
15 their inner ends cooperating with said stationary
contact ‘surfaces, individual manual and auto~_
matic actuating means for-said members, and side
and end walls forming an arc chamber about and
common to said contact surfaces, said endwalls
20 having partial slots therein receiving and guiding
said members.
_
3. In an electric circuit breaker, a stationary
contact plate having spaced contact surfaces
mounted thereon, an opening in said plate be
tween said surfaces providing passage for are
gases, oppositely extending movable switching
members having contact surfaces at their inner
ends cooperating with said stationary contact
surfaces, individual manual and automatic actu
30 ating means for said members, and side and end
walls forming an arc chamber about and com
mon to said contact surfaces, said end walls hav
ing partial slots therein receiving and guiding
said members.
4. In an electric circuit breaker, a generally
cup-shaped base, a stationary contact surface
spaced from andfacing the bottom of said base,
a movable contact member carrying a contact
surface disposed between said stationary contact
40 surface and the bottom of the base, manual and,
automatic. operating means for moving said mem
ber, a barrier wall disposed between said oper
ating means and contact surface, said wall ex
tending adjacent to‘ the top of the base and hav
45 ing a restricted slot adjacent its bottom portion
receiving said movable member, and a flat cover
for said base engaging the top of said wall and co
operating therewith to substantially isolate the
50
contact surfaces from the operating means.
5. In an electric circuit breaker,.a generally
cup-shaped base, a pair of electrically connected
stationary contact surfaces disposed between
the ends of said base and spaced from and facing
the bottom of the base, movable conducting mem
.1 Li bers disposed between the stationary contact sur-_
faces and the opposite ends of the base, said
members carrying contact surfaces at their in
ner ends cooperating with the stationary contact
surfaces, individual manual and automatic
operating means for moving said members,
spaced barrier walls disposed between the sta
tionary contact surfaces and the operating
means, each of said walls having a restricted
slot receiving and guiding the cooperating mov
able member, and a flat cover for said base en
gaging the tops of said walls and cooperating
therewith to substantially isolate the contact sur
faces from the operating means.
6. In an electric circuit breaker, a generally
cup-shaped base, a stationary contact plate
spaced from the bottom of the base and having
contact surfaces thereon facing the bottom of
the base and spaced toward the ends of the base,
an- opening through said plate between said sur
faces providing passage for are gases, individual
3
movable contact surfaces cooperating with said
stationary surfaces and carried by elongated
conducting members oppositely extending toward
the ends of the base, individual manual and auto
matic operating means for moving said members,
insulating walls alongside and below said contact
surfaces, and spaced barrier walls between said
operating means and contact surfaces and ex
tending adjacent to the top of the base, said
barrier walls having restricted slots adjacent 10
their bottom portions receiving said members.
7. In an electric circuit breaker, a conducting
element carrying a contact surface thereon, a
movable switching element having a contact sur
face cooperating with said first mentioned con 15
tact surface, and an opening through said con
ducting element adjacent to said first mentioned
contact surface providing passage for are gases
generated by an arc drawn between said contact
surfaces.
20
8. In an electriccircuit breaker, a base, a sta
tionary contact plate mounted on said base and
having spaced contact surfaces thereon, an open
ing through said plate between said surfaces pro
viding passage for are gases, movable members 25
carrying contact surfaces cooperating with said
first mentioned surfaces, and individual manual
and automatic means for moving said members.
9. In an electric circuit breaker, a base, a con
ducting plate spaced from the main body of the 30
base and carrying spaced contact surfaces facing
toward the main body of the base, an opening
through said plate between said surfaces pro
viding passage for are gases, movable contact
surfaces disposed between the main body of the
base and said first mentioned surfaces, and man“
ual and automatic means for moving said mov
able contact surfaces.
10. In an electric circuit breaker, a generally
cup-shaped base, a stationary contact surface 40
spaced from and facing the bottom of said base,
a movable contact member carrying a contact sur
face disposed between said stationary contact
surface and the bottom of the base, manual and
automatic operating means for moving said 45
member, insulating walls on opposite sides of said
movable contact surface, an insulating plate be
tween said walls in the path of said movable
contact surface, and a slot in said plate through
which said. movable surface passes in engaging 50
and disengaging said stationary surface.
11. In an electric circuit breaker, a generally
cup-shaped base, a stationary contact surface
spaced from and facing the bottom of said base,
a movable contact member carrying a contact 55
surface disposed between said stationary contact
surface and the bottom of the base, manual and
automatic operating means for moving said
member, insulating walls on opposite sides of said
movable contact surface,ian insulating plate be
tween said walls in the path of said movable
contact surface, a slot in said plate through which
said movable surface passes in engaging and
disengaging said stationary surface, and a bar
rier wall disposed between said operating means 65
and contact surfaces and having a restricted slot
adjacent its bottom portion receiving and guiding
said member.
12. In an electric circuit breaker, a generally
cup-shaped base, a pair of electrically connected 70
stationary contact surfaces disposed between the
ends of said base and spaced from and facing
'the bottom of the base, movable conducting
members disposed between the stationary con
tact surfaces and the opposite ends of the base,
2,182,627
said members carrying contact surfaces at their
inner ends cooperating with the stationary con
tact surfaces, individual manual and automatic
operating means for moving said members, a
face limiting said extreme position.
v
18. In an automatic electric circuit breaker, a
transverse insulating plate disposed across the
stationary contact plate having spaced contact
path of movement of said movable contact sur
surfaces thereon, movable members extending in
faces, and slots in said plate through which said
opposite directions and carrying contact surfaces
movable surfaces pass in engaging and disen
at their adjacent ends cooperating with said, sta
tionary surfaces, indvidual manual and auto
matic means for moving said members, elongated ;
gaging said stationary surfaces.
10
movable surfaces, and an insulating plate dis
posed over said joining portion to provide a sur
13. In an electric circuit breaker, a generally
cup-shaped base, a stationary contact plate
spaced from the bottom of the base and having
contact surfaces thereon facing the bottom of
the base and spaced toward the ends of the base,
15 an opening through said plate ‘between said sur
faces providing passage for are gases, individual
movable contact surfaces cooperating with said I
stationary surfaces and carried by elongated con
magnetic plates common to both sets of cooper
ating contacts and contact surfaces and dis
posed on opposite sides of the path of movement
of said adjacent ends of said members and a
magnetic portion joining substantially the middle 3
portions of the edges of said magnetic plates re
mote from said contact plate.
19. In an automatic electric circuitbreaker', a
ducting members oppositely extending toward ' base, separable contacts and automatic and man
Eli the ends of the base, individual manual and auto
matic operating means for moving said members,
insulating walls alongside of and below said con
tact surfaces, a transverse insulating plate dis
posed across the path of movement of said mov
able contact surfaces, and slots in said plate
through which said movable surfaces pass in en
ual means for actuating said contacts mounted
on said base, a cover for said base, an operating
handle projecting through an enlarged opening
in said cover which provides substantial clear
ance between the cover and the handle, and a
stationary thin insulating sheet separating said
cover from the base and having a smaller open
gaging and disengaging said stationary surfaces.
ing relatively closely receiving said handle to
14. In an automatic electric circuit breaker,
electrically connected stationary contact. sur
substantially prevent the blowing out of arc gases
through the cover opening.
faces, movable contact surfaces cooperating
therewith, individual manual and automatic
means for moving said movable'contact surfaces,
substantially cup-shaped base, separable contacts
and spaced magnetic plates common to both sets
of contact surfaces anddisposed on opposite sides
85 of the path of movement of both said movable
contact surfaces.
>
15. In an automatic electric circuit breaker,
electrically connected stationary contacts, mov
able members extending in opposite directions
and carrying contact surfaces at their adjacent
ends cooperating with said stationary contacts,
individual manual and automatic means for mov
20. In an automatic electric circuit breaker, a
and automatic and manual means for actuating
said contacts mounted on said base, a cover for
said base, an operating handle projecting through
an enlarged opening in said cover, and a station
ary thin sheet of insulation lining said cover and
having a smaller opening closely embracing said
handle, said insulating sheet thus closing the
enlarged cover opening about the handle and in
hibiting the blowing out of arc gases generated
within the circuit breaker interior.
21. In an automatic electric circuit breaker, a
ing said members, and spaced magnetic plates
substantially cup-shaped base, separable con
common to both sets of cooperating contacts and
contact surfaces and disposed on opposite sides
tacts and automatic and manual means for actu
ating said contacts mounted on said base, a me
tallic cover for said base, an operating handle
of and with their planes substantially parallel
to the path of movement of said movable contact
surfaces.
16. In an automatic electric circuit breaker,
projecting through an enlarged opening in said
iii) electrically connected stationary contacts, mov
able members extending in opposite directions
and carrying contact surfaces at their adjacent
ends cooperating with said stationary contacts,
closely embracing said’ handle, the opening in
individual manual and automatic means for
55 moving said members, spaced magnetic plates
common to both sets of cooperating contacts and
contact surfaces and disposed on opposite sides
of and with their planes substantially parallel
to the path of movement of said movable con
tact surfaces, and a transverse magnetic portion
joining said plates beyond the extreme position of
said movable surfaces.
17. In an automatic electric circuit breaker,
electrically connected stationary contacts, mov
able members extending in opposite directions
and carrying contact surfaces at their adjacent
ends cooperating with said stationary contacts,
individual manual and automatic means for mov
ing said members, spaced magnetic plates ‘com
70 mon to both sets of cooperating contacts and
contact surfaces and disposed on opposite sides
of and with their planes substantially parallel to
the path of movement of said movable contact
surfaces, a transverse magnetic portion joining
75 said plates beyond the extreme position of said
cover, and a stationary thin sheet of insulation
lining said cover and having a smaller opening
said sheet being smaller than said handle and.
the edges thereof being bent against and interi
orly of said handles to prevent blowing out of
arc gases.
' 22. In an automatic electric circuit breaker,
a base, electrically connected stationary contacts,
aplurality of individual movable contacts, indi
vidual manual and automatic operating means
for moving said movable contacts, a cover for
said base, said means including handle portions
extending through said cover, the cover open
ings being substantially larger than said handle
portions to provide clearance thereto, and a sta
tionary thin ?bre sheet provided with openings
closely embracing said handle portions, said ?bre
sheet thus closing the cover openings about the
handle portions and inhibiting the blowing out
of arc gases generated within the circuit breaker
interior.
23. In an electric circuit breaker, a generally
cup-shaped base, a stationary contact surface
disposed within said base, a movable contact
member carrying a contact surface adapted to co
operate with said stationary contact surface,
manual and automatic operating means for mov
amass?
ing said member to perform the switching opera
tion, a barrier wall disposed between said cooper
ating contact surfaces and said operating means
and having a slot adjacent its bottom portion
receiving said member, said wail being slidably
5
,
cup-shaped base, electrically connected station
ary contact surfaces disposed substantially in
termediate the ends of the base, aligned movable
contact members carrying contact surfaces
adapted to cooperate with said stationary con
tact surfaces, individual manual and automatic
operating means for moving said members to
interlocked with formations within the base to
restrict movement thereof except forwardly at
right angles to the back of the base, and cover perform the switching operations, there being
means sealably attachable to said base and main
at least one member and operating means dis
taining said plate in position therein.
posed between said stationary contact surfaces
24. In an electric circuit breaker, a generally and each end of the base, a barrier wall between
cup-shaped base, a stationary contact surface ‘said stationary contact surfaces and the oper
disposed within said base, a movable contact ating means at each end of the base, said barrier
member carrying a contact surface adapted to walls having slots adjacent their bottom por
cooperate with said stationary contact surface, tions receiving said members, a cover for said
manual and automatic operating means for mov
base, said barrier walls being slidably interlocked
ing said member to perform the switching oper- ‘ with said base to restrict relative movement ex
ation, a barrier wall disposed between said co . cept at right angles to the back of said base and
operating contact surfaces and said operating being maintained in position by said cover, said
means and having a slot adjacent its bottom por
walls cooperating to form an arcing chamber
tion receiving said member, said wall being slid
about said contact surfaces.
ably interlocked with formations within the base.
28. In an electric circuit breaker, a generally
to restrict movement thereof except forwardly at cup-shaped base, electrically connected station
right angles to the back of the base, and cover ary contact surfaces disposed substantially in
means sealably attachable to said base and main
termediate the ends of the base, aligned mov
taining said plate in position therein, said wall able contact members carrying contact surfaces
extending to said cover to substantially isolate adapted to cooperate with'said stationary con
the cooperating contacts and any arcs drawn tact surfaces, individual manual and automatic
therebetween from the operating means.
operating means for moving said members to
25. In an electric circuit breaker, a generally perform the switching operations, there being
cup-shaped base, a stationary contact surface at least one member and operating means dis
disposed within said base, a movable contact posed between said stationary contact surfaces
member carrying a contact surface adapted to and each end of the base, a barrier wall between
cooperate with said stationary contact surface, said stationary contact surfaces and the oper
manual and automatic operating means for mov
ating means at each end of the base, said barrier
ing said member to perform the switching oper
walls having slots adjacent their bottom portions
ation, a barrier wall disposed between said co
receiving said members, a cover for said base,
operating contact surfaces and said operating ‘said barrier walls extending substantially to the
means and having a slot adjacent its bottom cover to form an arcing chamber enclosing said
portion receiving. said member, said wall being contact surfaces and substantially isolated from
slidably interlocked with formations within the said operating means, and a restricted opening
base to restrict movement thereof except for ‘at the junction of said cover and base for the
wardly at right angles to the back of the base, venting of arc gases generated within said
cover means sealably attachable to said base and
maintaining said plate in position therein, said
wall extending to said cover to substantially iso
late the cooperating contacts and any arcs drawn
therebetween from the operating means, and a
restricted opening between said cover and base
providing for the venting of any gases generated
by an are drawn between said cooperating contact
surfaces.
.
26. In an electric circuit breaker, a generally
cup-shaped base, electrically connected station
' V ary contact surfaces disposed substantially inter
mediate the ends of the base, aligned movable
contact members carrying contact surfaces
adapted to cooperate with said stationary con
tact surfaces, individual manual and automatic
operating means for moving said members to
10
15
20
25
80
35
40
chamber.
29. In an electric circuit breaker, a generally 45
cup-shaped base, stationary and movable con
tacts and manual and automatic operating
means for moving said movable contact to perform the switching operation, said contacts and
operating means being disposed within said base,
and a flat cover plate sealably attached to said
base to enclose said means from exterior access
except for a manual operator projecting through
the cover, and a restricted opening formed at the
juncture of said cover plate and base and serv
ing for the venting of arc gases generated within
the base.
50'
,
30. In an electric circuit breaker, a generally
cup-shaped base, stationary and movable con
tacts and manual and automatic operating 00
perform the switching operations, there being‘ means for moving said movable contact to per
at least one member and operating means dis
form the switching operation, said contacts and
posed between said stationary contact surfaces operating means being disposed within said base,
and each end of the base, a barrier wall between i insulating formations within said base forming
said stationary contact surfaces and the operat-' an arc chamber about said contacts and sub
ing means at each end of the base, said barrier stantialiy shielding said operating means, a
walls having slots. adjacent their bottom por
cover plate seaiably attached to said base to pre
tions receiving said members, a cover for said
vent access to the interior thereof, and a re
base, said barrier walls ‘extending substantially
stricted opening formed at the juncture of said
to the cover to form an arcing chamber enclosing
cover plate and base and in communication with I
said arc chamber to vent to the exterior of the
base are gases generated within the chamber.
JOHN G. JACKSON.
said contact surfaces and substantially isolated
from said operating means.
27. In angelectric circuit breaker, a generally
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