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Патент USA US2132626

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Oct. l1, 1938.
J. G. JACKSON
v2,132,626
CIRCUIT BREAKER
Filed April 1, 1956
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Oct. 1l, 1938.
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CIRCUIT BREAKER
Filed April l, 1936
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Patented Oct. 11, 1938
2,132,626
UNITED STATES PATENT OFFICE
2,132,626
CIRCUIT BREAKER
l John G. Jackson, Damn, Mich., assigner to
'
Square D Company, Detroit, Mich.,.a corpora
tion of Michigan
Application Api-u 1, 193s, serial Na 12,034 '
11 claims. (ci. zoo-11s)
’I'his invention relates to apparatus for making tion two multi-circuit circuit breaker units 5 and
and breaking electric circuits and more particu
larly to electric circuit. breakers automatically
6 of identical form.
These units embody gener
ally cup-shaped' bases ‘I having metallic covers 8
operable to break the circuit in response to a
5 current overload and constitutes a modification
of the circuit breaker described and claimed in
sealably secured thereto as by means of rivets 9.
_applicant’s copending application, Serial No.
36,247, filed August 15, 1935.
through the covers 8. In the juxtaposed assem
bly of Figure 1 the adjacent handles on the two
One object of the present invention is to pro
10 vide a method of feeding a plurality of electric
circuits through a unitary sealable multi-circuit
circuit breaker embodying a sealable enclosure
with a plurality of individual circuit breaker
mechanisms within the enclosure and having
l5 electrically common current responsive elements.
Another object'of the present invention is to
provide an automatic multi-circuit electric cir
cuit breaker including a plurality of individual
automatic electric circuit breaker mechanisms
20 having electrically common current responsive
elements.
‘Anotherobject of the Vpresent invention is to
provide a multi-circuit circuit breaker having a
plurality'of individual automatic electric circuit
25 breaker mechanisms which include series _con
nected bimetallic elements with the bimetallic
elements provided with a common mounting
means.
.
'
Another object of the present invention is to
3o provide an improved multi-circuit circuit
breaker.
Another object of the present invention is‘to
provide an improved supporting means for
bimetallic elements in a circuit breaker.
35
Other objects and features of the invention
will be readilyA` apparent to those skilled in the
art from the following- specification and ap
pended drawings illustrating certain preferred
embodiments of the invention in which:
40
Figure 1 is a front elevational view of'a circuit
breaker assembly with the cover parts broken
away to show the internal mechanism.
Figure 2 is a vertical sectional view taken on
, the line II-II of Figure 1.
45
Figure 3 is a partial View similar to Figure 2
showing the parts in diiïerent position. '
In the assembly there is .shown an outer
metallic enclosing box I having an openable
cover 2.- Within the box is hingedly supported
50 a strap 3 of generally U-shape, having the leg
opposite the hinge closely embracing the cooper
ating side wall of the box and carrying a. stud
4 received within a slot in the side wall of the box
to maintain the strap in its interior position.
u 'On the strap are disposed in juxtaposed rela
'I'he individual circuit breaker mechanisms are 5 _
provided with operating handles II extending
units are joined together for common movement
by means of an element I2 carrying portions dis- 10
posed in openings in the handles as more fully
described and claimed in applicant’s copending
application, Serial No. 114,021 ñled December 3,
1936, and constituting adivision of application
Serial No. 72,035, iiled April l, 1936. It is noted l5
that in the assembly the exterior cover 2 has a
central opening to permit access to the operating
handles while the cover is in place and overlaps .
the covers 8 for the individual units as more par
ticularly shown in Figures 2 and 3.
'I'he individual mechanisms for the breakers
correspond in general to that disclosed in the
first mentioned copending application and em
body a iioating contact bar I3 having a notch I4
in its upper edge receiving the top edge of a
cooperating slot in one leg olf a rectilinearly mov
able member I5, generally U-shaped in cross
section. The opposite leg of this element is con
siderably shorter than the bar engaging leg and
constitutes a stop for the bar in its automatically tripped position. The element I5 is guided
for rectilinear movement at right angles to the
back of the base by means of suitable projections
within the base as is more fully explained in the
first mentioned copending application. The bar
I3 is provided at the end adjacent the ends of the
base with contact surface I 6 and at its opposite
end with the latching surface I1 adapted to coop
erate with a bimetallic element I8 having its free
20
25
30
35
end connected to a mid point on the bar by means 40
of a iiexible lead I9. Ledges 2| are provided on
the ends of the exterior of the base and connectors
22 carrying contact surfaces on the ends disposed
within the base interior are rigidly mounted on
the ledges by spun over ends of metallic inserts 45
23. Terminal studs are provided threaded into
the inserts 23. Fibre plates 2l are disposed at
the ends oi' the base and are maintained in place
by the overhanging portion of the covers 8 to
sealably enclose the interior against access. A 50
compression spring 25 is disposed between the
bottom edge of the bar I3 and the back of the
base
The base is provided with anv elongated central
_Supporting wall 26 upon which is supported a 55
2,132,626
conducting plate 21 having integral corner ex
tensions return bent to form spaced parallel por
tions 28 and intermediate connecting portions 29.
To each of the connecting portions 29 is Welded
or otherwise rigidly secured one end of the bi
metallic latching elements IB. Adjusting studs
3| may be threaded into the parallel portions 28
l and bear against the plate 21, thus providing
means for varying the angle of the connecting
10 portions 29 with respect to the plate and con
sequently for adjusting the position of the latch
ving ends of the bimetallic elements. A libre or
other insulating piece 32 may be provided over
the bimetallic mounting assembly to properly
_
15 insulate it from the cover 8.
The interior portions of the handles I I are pro
vided With cam surfaces 33 adapted to cooperate
with the tops of the members I5 to eiîect move
ment thereof to actuate the breaker mechanism.
20 The handles are mounted for rotary movement
upon shafts 35 disposed within recesses 36 in the
side walls of the base. Relatively light springs
34 are provided to bias the operating handles for
rotation toward the “oiî” position, thus forcing
25 the cam surfaces 33 against the members I5 and
holding the members I5 within the notches I4 in
the bars I3. These- springs enable the handles to
assume a definite “on” position as shown at the
30
left in Figure 2.
The circuit breaker mechanism shown at the
left in Figure 2 is in the “on” position with the
stationary and movable contact surfaces engaged.
To move the parts to the manual “oiî” position
the handle II is rotated counterclockwise to the
dotted line position there shown, whereupon the
parts will assume the position shown in reverse at
the right in Figure 2. The cam surface 33 trans
forms the rotary movement of the handle into
rectilinear movement of the element I5, where
40 upon the bar I3 is moved toward the back of the
base. For the major part of this movement the
bar I3 pivots about the engagement of its latch
ing surface I1 with the bimetallic latch I8 until
the contact carrying end of the bar engages the
45 back of the base or other stop, whereupon the
latching end of the bar is moved slightly beyond
'the latching tip of the bimetal. As the engage
ment between the camming surface and the mem
ber I5 is now substantially in line with the pivot
50 point for the handle, it is seen that this consti
tutes a stable position which the parts will main
tain. When the parts are in the “on” position, if
a current overload should occur, the correspond
ing bimetal will ñex or bend due to the heat gen
55 erated therein and the free end of the bimetal will
move out of engagement with the latching end of
the bar I3. This permits the bar to rotate under
the action of its biasing spring 25 into the posi
tion shown in Figure 3. This rotative motion is
60 limited by the engagement of the bar with the
shorter leg of the member I5. As the operating
spring 25 is many times stronger than the handle
biasing spring 34, release of the bar causes an
upward movement of the member I5 which ro
tates the handle into the position shown in Figure
3 which corresponds to a position of the exterior
part of the handle shown in dotted lines as a
clockwise rotation of the handle shown at the
left in Figure 2.
To reset the breaker mechanism after an auto
70
matic operation, the handle is rotated toward the
“off” position whereupon the cam surface 33
moves the parts to the position shown in Figure 2
corresponding to the manual “ofi” position. In
this movement the contact end of the -bar I3
ñrst engages the back of the box or other stop
and is then rotated about the engagement
of notch I4 within the member I5 into the po
sition shown at the right in Figure 2. To place
the parts again in the “on” position the handle
is rotated in the opposite direction whereupon
the latchlng end of the bar engages with the
bimetal, if it has in the meantime cooled suffi
ciently to assume its normal position, and the
movable contact surface on the bar will engage
with the stationary contact surface on the
connector 22.
While certain preferred embodiments of the
invention have been specifically disclosed, it is
understood that the invention is not limited 15
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‘:
_
20
1. In a multi-circuit, automatic electric cir
cuit breaker, a common base, a plurality of elec
trically common bimetallic latching elements
mounted on said base, a plurality of individual
automatic electric circuit breaker mechanisms 25
on said base including stationary and movable
contacts and means for automatically moving
the movable contact to a disengaged position
upon movement of the corresponding bimetallic
element, a cover sealably attached to said base to
form a sealable enclosure for the circuit breaker,
and circuit terminals readily accessible on the
outside of the enclosure and connected to said
stationary contacts.
2. In a multi-circuit, automatic electric circuit 35
breaker, a common base, a plurality of individual
circuit breaker mechanisms on said base includ
ing stationary and movable contacts, a member
releasable to eiîect movement of the movable con
tact and current responsive means for releasing 40
said member, a cover sealably attached to said
base to form a sealable enclosure for the circuit
breaker, one terminal for each of said mecha
nisms being readily accessible on the exterior of .
the enclosure, the other terminals for said mecha
45
nisms being sealed within the enclosure and at
least electrically connected together, said other
terminals being connected to the corresponding.
current responsive means of the mechanisms.
3. In a multi-circuit, automatic electric circuit
breaker, a common base, a plurality of individual
circuit breaker mechanisms on said base includ
ing stationary and movable contacts, a member
releasable to eiîect movement of the movable con
tact and current responsive means for releasing
said member, a cover sealably attached to said
-base to form fa sealable enclosure for the circuit
breaker, one terminal for each of said mecha
nisms being readily accessible on` the exterior
of the enclosure, the other terminals for said 60
mechanisms comprising a cluster of electrically
connected supporting means for the current re
sponsive means of the mechanisms, said cluster
being mounted within the sealable enclosure.
4. In a multi-circuit circuit breaker, a sealable 65
enclosure, a plurality of individual automatic
electric circuit breaker mechanisms within said
enclosure including stationary and movable
contacts, a member releasable to eiîect move
ment of the movable contact and a seriescon
nected, bimetallic element for releasing said
member, one terminal for each of said mecha
nisms being readily accessible on the exterior of
the enclosure, the other terminals for said
` mechanisms including a conducting element
2,132,626
carrying adjustable means for supporting the bi- »
metallic elements and mounted within the en
closure.
~
5. In a multi-circuit circuit breaker, a common
base, a common cover sealably attached to said
base to form an enclosure sealed from access, a
plurality of individual circuit breaker mecha
nisms within said enclosure each including sta
tionary and movable contacts, a member releas
10 able to eiîect movement of the movable contact-
3
metallic elements, a coversealably secured to
said base, and an exterior circuit terminal con
nected to each of said stationary contacts.
8. In a multi-circuit circuit breaker, an elon
gated sealable enclosure, electrically connected
bimetallic elements mounted within and sub
stantially midway between the ends of said en
closure, at least one circuit breaker mechanism
mounted between the bimetallic elements and
each end of the enclosure and including separable
and a series connected bimetallic element for , contacts and a member releasable by the corre
releasing said member, one terminal for each of sponding element to cause separation of the con
said mechanisms being connected to its sta
tionary contact and extending to and readily tacts, and an external terminal for each of said
15 accessible at the exterior of the enclosure, the mechanisms on the outside ends of said en
closure.
other terminals for said mechanisms being elec
trically common and inaccessible within the en
closure and connected to the bimetallic elements.
6. In a multi-circuit circuit breaker, an elon
20 gated base, a cluster of electrically connected
bimetallic elements mounted substantially cen
trally of the base, stationary contacts mounted
adjacent to the opposite ends of the base, a
movable contact bar extending from a bimetallic
25 element to each contact and carrying a contact
surface adjacent to one end cooperating with
said contact, said bar latching at its opposite end
to a bimetallic element, and biasing means for
each of said bars for moving them to a contact
disengaged position when released by the bi
metallic elements.
7. In a multi-circuit circuit breaker, an elon
gated base, a cluster of electrically connected
bimetallic elements mounted substantially cen
35
trally of the base, stationary contacts mounted
adjacent to the opposite ends of the base, a mov
able contact bar extending from a bimetallic
element to each contact and carrying a contact
surface adjacent to one end cooperating with
40 said contact, said bar latching at its opposite
end to a bimetallic element, biasing means for
each of said bars for moving them to a contact
disengaged position when released by the bl
9. In an electric circuit breaker, supporting
means for a bimetallic element comprising a con
ducting strap having a return bent portion, a
bimetallic element rigidly secured at one end to
said portion and an adjusting screw cooperating
with said strap and return bent portion for
changing the position of said element.
10. In an electric circuit breaker, supporting
means for a bimetallic element comprising a
main body portion having an integral portion in
spaced relation thereto, a bimetallic element
rigidly secured to the portion joining said ñrst
mentioned portions, and an adjusting stud
threaded in one of said iirst mentioned portions
and bearing against the other of said portions
to provide means for moving the bimetallic ele
ment.
l
11. In an electric circuit breaker, supporting
means for a bimetallic element comprising a
conducting plate having a plurality of integral
portions disposed in superposed, spaced relation,
a bimetallic element integrally connected at one
end to each ofthe portions joining said spaced
portions to the plate, and adjusting screws
threaded into said spaced portions and bearing
against the plate for changing the positions of
said elements.
JOHN G. JACKSON.
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