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Патент USA US3098146

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July 16, 1963
H. l. STANBACK ETAL
3,098,136
CIRCUIT BREAKER
Filed June 9, 1955
2 Sheets-Sheet 1
July 16, 1963
H. l. STANBACK ETAL-
3,098,136
CIRCUIT BREAKER
Filed June 9, 1955
2 Sheets-Sheet 2
(4
"l ,
United States Patent 0 "ice
g?hhddh
Patented July 16, 1963
2
1
necting membersof the circuit breaker mechanisms now
to be described.
3,098,136
In one end of the insulating base 1, and supported on
CHRCUET BREAKER
Harris l. Stanhack and Ralph H. Kingdom, Birmingham,
barriers established by portions of the base, is a conducting
Mich, assignors to Square D Company, Detroit, Mich,
terminal strap 4 provided at its outside end with a ter
a corporation of Michigan
minal screw 5 and having secured thereto, at its inside end,
Filed .l‘uue 9, 1%5, Ser. No. 514,222
the current responsive trip mechanism 6 of the circuit
24» Qlaims. (Cl. Mill-88)
breaker. An adjustment screw 7 extends through a slot in
the base 1 and threadedly engages the conducting strap
This invention relates to apparatus for making and
breaking electrical circuits, particularly circuit breakers 10 4 in the interior of the base 1 with the head thereof operat
ing against the slotted portion of the base 1‘ to provide an
automatically operable in response to current overloads,
adjustment for the calibration of the automatic circuit
and more particularly to the current responsive trip de
breaker. The adjustment screw, in cooperation with the
vices incorporated within the circuit breaker.
engagement of the strap 4 with the barriers of the base 1,
An object of the present invention is to provide an im
proved current responsive trip unit for an automatic elec 15 also serves the additional purpose of maintaining the strap
within the base, thereby eliminating the need for a separate
tric circuit breaker of simple and economical construc
supporting stud or screw.
tion.
The conducting strap ‘4 bears at one end against a nib
A further object of the present invention is to provide
8 in the insulating base 1 and substantially at its mid point
an improved ambient temperature compensation arrange
ment within the current responsive trip section of an 20 against a shoulder 9 on a portion of the insulating base so
that rotation of the adjustment screw 7' operates to de
automatic electric circuit breaker.
termine the angular position of the trip mechanism 6 with
A further object of the present invention is to provide
in the interior of the base i. The terminal end of the
an improved magnetic trip mechanism for an automatic
conducting strap 4 is suitably supported between support
electric circuit breaker.
A further object of the present invention is to provide a 25 ribs molded into the base and cover as generally shown in
FIGURE 1.
trip mechanism for an automatic electric circuit breaker
The current responsive trip- mechanism 6 supported on
wherein parts of the trip mechanism constitute a latching
the interior end of the conducting strap-4 constitutes a
surface for the circuit breaker mechanism so as to present
bimetallic member 11 attached by suitable means, such as
a smooth durable latching surface for the mechanism
without additional machining operations.
30 welding, to the strap 4 at one end and has ?xed thereto at
its other end, by a means such as welding, a magnetic
A further object of the present invention is to provide
yoke member 12 of a generally U shape. The magnetic
an ambient temperature compensation limiting device for
yoke member is provided with a pair of vertically di
an automatic electric circuit 1breaker whereby the circuit
spose-d nibs 13‘ at which the weld to the bimetallic mem
breaker will be compensated for ambient temperature in
its normal range of operation, but wherein the compensa 35 ber is made and between which there is welded to the bi
metallic member 11 and yoke 12, at the same time, a
tion mechanism will be restricted from operation when
braided conductor or pigtail 14. The magnetic yoke mem
the surrounding atmosphere has caused the circuit breaker
to attain a predetermined temperature.
Further objects and features of the invention will be
readily apparent to those skilled in the art from the fol
lowing speci?cations and appended drawings illustrating a
certain preferred embodiment of the invention in which:
ber is provided with an offset lower extension 15 central
ly thereof and, at the uppermost ends thereof, the arms of
the U are formed into supported pivot arms 16 disposed on
the opposite side of the bimetal member 11 from that
side on which the yoke member and bimetal are welded
together. A. movable magnetic armature member 17
FIGURE 1 is a side View of the circuit breaker with the
having a central cutout 18 is pivotmly supported on the
side cover removed and showing the operating mechanism
45 pivot arms 16 of the magnetic yoke 12 by outwardly ex
in the ON position.
tending shoulders 19' with the armature body formed so
FIGURE 2 is a ‘vertical sectional view of the circuit
as to extend toward the lower end of the circuit breaker.
breaker taken along the lines ll———ll of FIGURE 1.
The armature is iormed to provide ‘an armZl extending
FIGURE 3 is a vertical sectional view of the trip
beyond the bimetallic member '11 towardthe upper end
mechanism of the circuit breaker taken along the lines
of the circuit breaker at an offset angle away from the
Ill-Ill of FIGURE 2.
bimetallic member 11 and 'a helical coil spring 22' engages
FIGURE 4 is a sectional view through the trip mecha
the magnetic armature member 17 at the shoulders 19‘ and
nism of the circuit breaker taken along the lines IV——1V
about the arm 21 ‘at one end and, at the other end, oper
of FIGURE 3.
ates against the insulating base member 1 in a suitable
FIGURE 5 is a sectional view through the trip mecha
recess provided therein. To the lower end of the arma
nism of the circuit breaker showing the latch window insert
ture member 17 there is secured a U-shaped ambient
modi?cation of the present invention.
temperature responsive bimetal 23‘ having the upper por
The circuit breaker, as shown, comprises an open sided
tion of one end 24 thereof extending along the inner side
casing 1 of molded insulating material having molded
of the magnetic armature member 17 ‘and bent over at its
recesses and ribs for the support of the circuit breaker
mechanism and contacts therein.
A cover 2 of molded 60 extreme end ‘at 25 to extend along the lower surface of
the cutout >18 in the armature. The other leg 26 of the
‘insulating material, providing complementary recesses
and barriers, closes the open side of the casing 1 and is
mounted thereon by means of a plurality of rivets 3. Both
the base and side cover are provided with top and bottom
openings through which extend the operating and con
U-shaped bimetal 23 extends into cooperating relationship.
with the oifset extension 15 at the lower end of the mag
netic yoke member 12. An ambient temperature corn—
pensator limiter is provided in the trip mechanism 6 and
sesame
£1.
constitutes a hook shaped extension 36 formed on the
lower end of one leg of the U of magnetic yoke 12. The
hook shaped extension passes around the lower end of the
magnetic armature 17 allowing operating space between
the hook and armature and armature and yoke, but
limiting clockwise pivotal movement of the armature on
its support and operates in a manner to be more fully
describe-d hereinafter.
The operating mechanism of the circuit breaker con
stituting those parts which open and close the contacts
of the circuit breaker to make and break the circuit
‘ates to open the circuit breaker contacts in response to a
sustained moderate overload and in response to an in
stantaneous extreme overload in the manner which will
now be described.
The path of current through the circuit breaker is such
that current ?ows through the current responsive bi
metallic member 11 so that, upon sustained moderate
overload, the bimetallic member 11 de?ects about its
?xed engagement with the conducting strap 4 so as to
move the free end of the bimetallic member in a counter
clockwise fashion with respect to its ?xed end. Movement
of the bimetallic member 11 carries with it the magnetic
member 31 pivotally supported at one end of a leg 33
yoke member 12 moving the offset extension 15 and the
thereof on a hub 32, formed during the molding of base
bimetal 23 due to the cooperation with leg 26 of the U
1. The cradle 31 cooperates at the ‘extremity of the ‘other 15 shaped bimetal 23. The opposite end of the bimetal 23
through the device include a generally U-shaped cradle
leg 34 with the bent over portion 25 of the bimetal mem
ber 23 within the cutout 18 of the magnetic armature 17 .
A manual operator 35 having a handle portion at one end
thereof extending outwardly of the circuit breaker insulat
ing base 1 and a body portion extending inwardly into
the central recess of the base 1 provides a pair of legs 36
surrounding the cradle member 31 substantially at the
center thereof. Each of the legs 36 is provided with in
ward recesses 37 for support of a movable contact mem~
her, as will be described. The manually operable handle
35 is provided with a central trunnion 38 for cooperation
with suitable bearing recesses in the base 1 and case 2
for the pivotal support thereof.
is secured to the magnetic tar-mature member 17 so that
the armature is moved on sustained moderate overloads to
move the latching surface 25 from its cooperating engage
ment with the leg 34-‘ of the cradle member 31. Upon
release of the cradle member 31 from the latching surface
25, the cradle 31 is moved in a clockwise fashion about its
pivot 32 to carry the end of the coil spring 43 attached to
the cradle 31 at 4-4- to the other side of the pivotal engage
\ment ‘of the legs 42 within the recesses 37 of the operating
handle 35. Once the spring 43 has moved through this
line of pivot, the bias of the spring 4-3‘ becomes operative
to rotate the movable contact member 41 in a counter
clockwise fashion about its pivot in the recesses 37 of the
operating handle 35 to open the contacts 45 and 46 with
Pivotally supported to the manual operator 35 is ‘a
movable contact member 41 having a generally U-shaped 30 a snap action. In the same manner and upon the occur
cross section providing tw-o upwardly extending legs 42
rence of an extreme overload, the flow of cur-rent through
cooperating with the internal recesses 37 in the legs 36 of
the bimetallic member 111 sets up a magnetic ‘force in the
the operator 35. To the base of the U-shaped cross sec
magnetic yoke 12 which operates to attract the armature
tion of the movable contact member 41, :a helical coil
17 to instantaneously release the cradle member 31 ‘from
spring 43 is secured with the opposite end of the spring
its engagement with the latching surface 25, thereby caus
hooked to substantially the midpoint of the cradle mem
ing the same movements of the spring 43 and movable
ber 31 so that the tension of the spring maintains the
contact carrier 4-1 to open the circuit of the cont-acts 45
legs 42 spring biased into engagement with the recesses
and 46. It should be noted that the contacts 45 and 46
37 in the manual ‘operator 35. The spring 43 at the same
will be separated upon overload in the manner described,
time biases the leg 34 of the cradle 31 onto the latch sur 40 regardless of whether the manual operator 35 is held in its
face 25 in the window 18 in the armature :17. A contact
ON position or allowed to move with trip action making
45 is secured at the lowermost extremity of the movable
the circuit breaker trip free in action.
contact member 41 and at the ‘opposite end of the base
of the U-shaped cross section thereof from the sides de~
?ning the legs 42. Movable contact 45 cooperates with a
stationary contact 46 secured to the base of a U-shaped
spring jaw clip 47 having the lower end 4-8‘ thereof extend
ing beyond the base '1 of the circuit breaker. The ?exible
conductor or pigtail 14 secured at one end, as has been
described, to the bimetallic member 11, is also secured
by means such as welding at its other end to the movable
contact member 41 so that when the movable contact
45 engages stationary contact 46 a circuit is complete
Ambient temperature compensation is provided in the
current responsive trip mechanism 6 of the circuit
breaker through the construction of the U-shaped mem
ber 23 of a bimetallic material so arranged that its leg
26 moves away from the leg 24 on high ambient condi
tion and toward the leg 24 on lower ambient condition.
The movement of the ambient temperature responsive bi
metal 23 permits the latching surface 25 to remain sub
stantially in the same position at all ambient temperatures
by letting the leg 26 move substantially the same dis
tances as the free end of the current responsive bimetal
from the spring clip jaw 48 through the circuit breaker cur
11 will move due to an increase or decrease in ambient
rent responsive overload mechanism to the terminal 5. 55 temperature. An ambient temperature compensation
In the trip section latch modi?cation, as shown in FIG
limiter 31} is provided to insure operation of the circuit
URE 5 of the drawings, a latch piece 61 is inserted in the
breaker under extremely high ambient conditions, it be
window 18 of the magnetic armature v17 so as to produce
ing apparent that when an extremely high ambient tem
a smooth, hard latch surface for the cradle member 31.
perature exists, the ambient temperature bimetal 23 may
The latch piece 61 is of ‘double ended construction with
bend to an extreme angle such that the passage of over
each end formed similarly so that during assembly of the
load current through the current responsive bimetal 11
circuit breaker the insert may be positioned without
while causing ?exure thereof will not cause enough
concern for selection of ends. When mounted in the
window 18 and ?xed as by welding to the armature 17, the
lower end of the insert Wraps around the lower end of the
armature 17 and provides at that point a smooth, hard
movement to ensure cooperation of extension 15 of the
magnetic yoke member 12 with the leg 26 of the ambient
temperature bimetal 23. Under a condition of this sort,
an overload condition could continue through the circuit
surface for cooperation with the face of the cradle 31 at
breaker until damage had occurred in the protected load.
the latch end 34 as it moves to released position and, par
To insure against such a condition, the magnetic yoke 12
ticularly, as it is moved back to latched position in re
is provided with a hook shaped extension 36 cooperating
latching movement. With the modi?cation of this ?gure, 70 with
the magnetic armature 17 at the side thereof away
the wear on the latch end 34 of the cradle 31 is greatly
from
the current responsive bimetal. The extension 30,
reduced so as to maintain the latching areas in desirable
under normal conditions, allows the armature to operate
operating condition throughout the useful life of the cir
in the manner as has previously been described; how
cuit breaker.
ever, when a high ambient and overload current exists,
The current responsive overload trip mechanism 6 oper
the movement of the current responsive bimetal entail
3,098,136
ing like movement of the magnetic yoke brings the hook
extension 36)‘ into operative relation with the armature
1'7 and, should the extension 15 of the yoke not engage
the leg 26 of the bimetal 23, the armature will be moved
by the hook extension to trip the breaker.
The construction of the ‘U-shaped member 23 from bi
yoke supported near one end upon the free end of said
current responsive bimetallic member and having its body
portion extending toward the ?xed end of said cur-rent
responsive bimetallic member, a magnetic armature
member supported at one end on said yoke member and
extending substantially parallel to said yoke, said arma
ture member having a latching surface formed thereon
for said releasable means, and an ambient temperature
trip mechanism ‘6 of the circuit breaker in that the end
responsive bimetallic member ?xed to the unsupported
of the leg 24 bent over and cooperating with the cutout
portion 18 in the magnetic armature .17 to form the latch 10 end of said armature member, said ambient temperature
responsive bimetallic member being movable in response
surface 25 provides at the latch surface an extremely
to
movement of said current responsive bimetallic mem
smooth and hard latching surface for the leg 34 of the
metallic material provides an additional feature in the
cradle 31. In this manner an additional manufacturing
her to move said armature member to release said re
leasable means to effect separation of said contacts in re
sponse to current overloads through said circuit breaker.
15
magnetic armature 17 is eliminated and a uniform latch
4. In a trip unit for an automatic electric circuit
surface is provided in all circuit breakers as manu
step of hardening and machining the latch surface in the
factured.
While certain preferred embodiments of the invention
have been speci?cally disclosed, it is understood that the
breaker having separable contacts and means releasable
to effect separation of said contacts, a current responsive
bimetal, a current responsive magnetic yoke supported
invention is not limited thereto, as many variations will 20 upon said bimetal, a magnetic armature supported upon
be readily apparent to those skilled in the art, and the in.
vention is to be given its broadest possible interpretation
within the terms of the following claims:
What is claimed is:
1. In an automatic electric circuit breaker having sep
arable contacts and means releasable to effect separation
of said contacts, current responsive means for effecting
the release of said releasable means upon the passage of
said magnetic yoke, an ambient temperature responsive
bimetal having one end ?xed to said armature and its
other end movable by movement of said current respon
sive bimetal, said ?xed end of said ambient temperature
responsive bimetal cooperating with said armature to
form a smooth, hard latching surface ‘for said releasable
means.
i
5. In an automatic electric circuit breaker having
separable contacts and means releasable to effect sepa
an overload current through said circuit breaker com
ration of said contacts, current responsive means for
prising a bimetallic member ?xed at one end Within said
effecting the release of said releasable means upon the
circuit breaker and adapted to be heated in response to
passage of an overload current through the circuit breaker
the ?ow of current through said circuit breaker, a mag
comprising a bimetallic member ?xed at one end Within
netic yoke supported near one end upon the free end of
said circuit breaker and adapted to be heated in response
said current responsive bimetallic member, said magnetic
to
the flow of current through said circuit breaker, a
35
yoke having a body portion extending toward the ?xed
magnetic yoke supported near one end upon the free end
end of said current responsive bimetallic member, a mag
of said current responsive bimetallic member and having
netic armature member supported upon said yoke mem
ber and extending generally parallel to said yoke, an
ambient temperature responsive bimetallic member ?xed 40
to the unsupported end of said armature member and
extending beyond the said armature at the unsup
its body portion extending toward the ?xed end of said
current responsive bimetallic member, a magnetic arma
ture member supported upon said yoke and extending
generally parallel to said yoke, said armature being
formed to provide a latching area for said releasable
means, an ambient temperature responsive bimetallic
bimetallic member being movable in response to move
member ?xed to the unsupported end of said armature,
ment of said current responsive bimetallic member to ef
said ambient temperature responsive bimetallic member
fect release of said releasable means.
45 having a portion of its ?xed end extending into said
2. In an automatic electric circuit breaker having sep
latching area to form a latch surface and having its free
arable contacts and means releasable to effect the separa
end extending beyond said armature at the unsupported
tion of said contacts, current responsive means for effect
end thereof, said ambient temperature responsive bime
ing release of said releasable means upon the passage of
tallic member being movable in response to the movement
an overload current through said circuit breaker compris
of said current responsive bimetallic member to release
ing a bimetallic member ?xed at one end within. said cir
said releasable means to effect separation of said contacts
cuit breaker and adapted to be heated in response to the
in response to current overloads through said circuit
flow of current through said circuit ‘breaker, a magnetic
breaker.
yoke supported near one end upon the ‘free end of said
6. In an automatic electric circuit breaker having
current responsive bimetallic member and having its 55 separable
contacts and means releasable to effect separa
body portion extending toward the ?xed end of said cur
tion of said contacts, current responsive means effecting
rent responsive bimetallic member, a magnetic armature
the release of said releasable means upon the passage of
member supported upon said yoke member and extending
ported end thereof, said ambient temperature responsive
an overload current through said circuit breaker com
substantially parallel to said yoke, an ambient tempera
prising a bimetallic member ?xed at one end within said
ture responsive bimetallic member ?xed to the unsup 60
circuit breaker and adapted to be heated in response to
ported end of said armature and extending beyond said
the flow of current through said circuit breaker, a mag
armature at the unsupported end thereof, said ambient
netic yoke supported near one end upon the free end of
temperature responsive bimetallic member cooperating
said current responsive bimetallic member and having its
with a portion of said magnetic yoke near said supported
end whereby movement of said yoke causes movement of 65 body portion extending toward the ?xed end of said
current responsive bimetallic member, a magnetic arma
said ambient temperature responsive bimetallic member
ture member supported upon said yoke member and ex
to effect release of said releasable means.
tending generally parallel to said yoke member, said
3. In an automatic electric circuit breaker having sep
armature being formed to provide a latching area for
arable contacts and means releasable to‘ effect separation
of said contacts, a current responsive means for effecting
the release of said releasable means upon the passage of
an overload current through said circuit breaker compris
ing a bimetallic member ?xed at one end within said cir
cuit breaker and adapted to be heated in response to the
?ow of current through said circuit breaker, a magnetic
said releasable means, an ambient temperature responsive
bimetallic member ?xed at one end to the unsupported
end of said armature, said ambient temperature respon
’ ‘sive bimetallic member having a portion of its ?xed end
extending into said latch area to form a latch surface
and its free end extending beyond said armature at the
3,098,136
unsupported end thereof, said ambient temperature re—
sponsive bimetallic member cooperating with a portion
of said magnetic yoke near said ?xed end whereby move
ment of said yoke causes movement of said ambient tem
perature responsive bimetallic member to release said re
leasable means to effect separation of said contacts in
response to current overloads through said circuit breaker.
7. An automatic electric circuit breaker comprising a
current responsive bimetallic element and circuit con
8
and having its body portion extending toward said ?xed
end of said current responsive bimetallic member with
the legs of said yoke surrounding said bimetallic mem
ber, said legs of said yoke member at said extending end
presenting posts on the opposite side of said bimetallic
member from the side on which said yoke is ?xed there
to, a magnetic armature member pivotally supported at
said hinge posts and extending generally parallel to said
bimetallic member and to the ends of said legs of said
trolling parts controlled thereby, a current responsive
magnetic yoke, said magnetic yoke having a pair of nibs 10 U-shaped yoke, an ambient temperature responsive bi~
metallic member ?xed to the unsupported end of said
on one surface thereof disposed with respect to each
armature and extending beyond said armature at the
other and de?ning a valley therebetween, and a ?exible
unsupported end thereof, said ambient ‘temperature re
conductor, said conductor being connected at one end to
sponsive bimetallic member cooperating with a portion
said circuit controlling parts, said current responsive bi~
metal, magnetic yoke and other end of said ?exible con 15 of said magnetic yoke near said ?xed end whereby move
ment of said yoke causes movement of said ambient tem
ductor being ?xed together with said ?exible conductor
perature responsive bimetallic member to release said re
between said yoke and said bimetal and in said valley
leasable means to effect separation of said contacts in
de?ned by said nibs.
response to current overloads through said circuit breaker.
8. An automatic electric circuit breaker comprising a
11. In an automatic electric circuit breaker having
current responsive bimetal element and circiut controlling
separable contacts and means releasable to effect separa
parts controlled thereby, a current responsive magnetic
tion 'of said contacts, current responsive means for ef
fecting the release ‘of said releasable means upon the pas
sage of an overload current through said circuit ‘breaker
25
comprising
a bimetallic member ?xed at one end within
conductor being connected at one end to said circuit
yoke, said magnetic yoke having a pair of nibs on one
surface thereof disposed with respect to each other and
de?ning a valley therebetween, a ?exible conductor, said
controlling parts, said current responsive bimetal, mag
netic yoke and other end of said ?exible conductor being
?xed together with said ?exible conductor between said
yoke and said bimetal and in said valley de?ned by said
nibs, a magnetic armature member supported upon said
yoke, an ambient temperature responsive bimetal having
said circuit breaker and adapted to be heated in response
to the ?ow of current through said circuit breaker, a
U-shaped magnetic yoke supported near one end upon
the free end of said current responsive bimetallic mem
ber and having its body portion extending toward the
?xed end of said current responsive bimetallic member
one end ?xed to said armature and its other end movable
with the legs of said yoke surrounding said bimetallic
9. In an automatic electric circuit breaker having sep
arable contacts and means releasable to effect separation
parallel to said tbimetallic member and to the ends of
member, said legs of said yoke member at said extended
by movement of said current responsive bimetal, said
end presenting hinge posts on the opposite side of said
?xed end of said ambient temperature responsive bimetal
cooperating with said armature, and forming a smooth, 35 bimetallic member from the side on which said yoke is
mounted thereto, a magnetic armature member pivotally
hard latching surface within said circuit breaker for said
supported at said hinge posts and extending ‘generally
circuit controlling parts.
the legs of said U-shaped yoke, said armature being
40 formed to provide a latch area for said releasable means,
of said contacts, current responsive means for effecting
an ambient temperature responsive bimetallic member
release of said releasable means upon the passage of an
?xed to the unsupported end of said armature, said am
overload current through said circuit breaker comprising
bient temperature responsive bimetallic member having
a bimetallic member ?xed at one end within said circuit
a portion of its ?xed end extending into said latch area
breaker and adapted to be heated in response to the ?ow
of current through said circuit breaker, a U-shaped mag
netic yoke ?xed at one end upon the free end of said
current responsive bimetallic member and having its body
portion extending toward the ?xed end of said current
responsive bimetallic member with the legs of said yoke
surrounding said bimetallic member, said legs of said
yoke member at said extended end presenting hinge posts
on the opposite side of said bimetallic member from the
side on which said yoke is ?xed thereto, a magnetic
armature member pivotal-‘1y supported at said hinge posts
and extending generally parallel to the said bimetallic
member and the legs of said U-shaped yoke, and an
ambient temperature responsive bimetallic member ?xed
to form a latch surface therein and having its free end
extending beyond said armature at the unsupported
end thereof, said ambient temperature responsive bimetal
lic member being operable in response to movement of
said current responsive bimetallic member to release said
releasable means to effect separation of said contacts in
response to overload current flow through said circuit
breaker.
12. In an automatic electric circuit breaker having
separable contacts and means releasable to e?ect sepa
ration of said contacts, ‘current responsive means ‘for ef
fecting the release of said releasable means upon the pas
sage of an overload current through the circuit ‘breaker
comprising a bimetallic member ?xed at one end within
to the unsupported end of said armature and extending
said circuit breaker and adapted to be heated‘ in response
beyond said armature at the unsupported end thereof,
said ambient temperature responsive bimetallic member 60 to the ?ow of current through said circuit breaker, a
U-shaped magnetic yoke supported near one end upon
being movable in response to movement of said current
the free end of said current responsive bimetallic member
responsive bimetallic member to release said releasable
and having its body portion extending toward said ?xed
means to e?ect separation of said contacts in response
end of said current responsive bimetallic member with
to overload current ?ow through said circuit breaker.
10. In an automatic electric circuit breaker having 65 the legs of said yoke surrounding said bimetallic mem
ber, said legs of said yoke member at said extended
separable contacts and means releasable to effect separa
end presenting hinge posts on the opposite side of said
tion of said contacts, current responsive means for effect
bimetallic member fro-m the side on which said yoke is
ing the release of said releasable means upon the pas
mounted thereto, a magnetic armature member pivotally
sage of an overload current through said circuit ‘breaker
comprising a bimetallic member ?xed at one end within 70 supported at said hinge posts and extending generally
parallel to said bimetallic member and to the end of said
said circuit breaker and adapted to be heated in response
legs of said U-shaped yoke, an ambient temperature
to the ?ow of current through said circuit breaker, a
responsive bimetallic member ?xed to the unsupported
U-shaped magnetic yoke ?xed near one end upon the
end of said armature and extending beyond said arma
free end of said current responsive bimetallic member
ture at the unsupported end thereof, said ambient tem
aoearse
perature responsive bimetallic member cooperating with
a portion of said magnetic yoke near said fixed end
whereby movement of said yoke causes movement of
said ambient temperature responsive bimetallic member
to release said releasable means to effect separation. of
said contacts in response to overload current ?ow through
said circuit breaker.
13. A trip unit for an automatic electric circuit breaker
lb
so ‘as to eliminate said ambient temperature compensa
tion above a preselected ambient condition.
16. In an automatic electric circuit breaker having sep
arable contacts and means releasable to effect separation
of said contacts, current responsive means for effecting the
release of said releasable means upon the passage of an
overload current through said circuit breaker comprising
a bimetallic member ?xed at one end Within said circuit
breaker and adapted to be heated in response to the flow
having separable contacts and means releasable (to effect
separation of said contacts, said trip unit comprising a ID of current through said circuit breaker, a magnetic yoke
supported near one end on the free end of said current
current responsive bimetal, a current responsive mag
responsive bimetallic member, said magnetic yoke having
netic yoke supported on said bimetal, a magnetic arma
a body portion extending toward the ?xed end of said
ture supported on said magnetic yoke, an ambient temr
current responsive bimetallic member, a hook extension
perature responsive bimetal having one end ?xed to said
on the ?xed end of said magnetic yoke, a ‘magnetic arma
armature and its other end operable by movement of
said current responsive bimetal, said ambient tempera
ture responsive bimetal having its high expansion side
facing the high expansion side of said current respon
ture member supported upon said yoke member and
extending generally parallel to said yoke, said magnetic
sive bimetal and mounted so that substantially all of
armature member being arranged to provide a ‘latch sur
face for said releasable means, an ambient temperature
arable contacts and means releasable to e?ect the sep
to effect release of said releasable means, said hook ex
said ambient temperature bimetal is disposed away from 20 responsive bimetallic member ?xed to the unsupported
end of said armature member and extending beyond said
said current responsive bim-etal, said ?xed end of said
armature at the unsupported end thereof, said ambient
ambient temperature responsive bi-metal cooperating with
temperature responsive bimetallic member being movable
said armature to form a smooth, hard latching surface
in response to movement of said current responsive bi
for said releasable means.
metallic member to move said magnetic armature member
14. In ‘an automatic electric circuit breaker having sep
aration of said contacts, current responsive means for
effecting the release of said releasable means upon the
passage of an overload current through said circuit breaker
comprising a current responsive bimetallic member fixed
at one end within said circuit breaker and adapted to be
heated in response to the ?ow of current through said cir
cuit breaker, a magnetic yoke supported near one end
upon the free end of said current responsive bimetallic
tension being in cooperating alignment with said mag
netic armature ‘at the unsupported end thereof and ‘at the
side away from the said yoke and movable with said
current responsive bimetallic member to e?ect release of
said releasable means so as to eliminate said ambient tem
perature compensation.
17. in an automatic electric circuit breaker having sep
arable contacts and means releasable to effect separation
member, said magnetic yoke having a body portion ex 35 of said contacts, current responsive means for e?ecting
the release of said releasable means upon the passage of
tending toward the ?xed end of said current responsive bi~
an overload current through said circuit breaker com
metallic member, a magnetic armature member supported
prising a bimetallic member ?xed at one end within said
on said magnetic yoke ‘and extending generally parallel to
circuit breaker and adapted to be heated in response to
said yoke, and said magnetic armature member being ar
the flow of current through said circuit breaker, a mag
ranged to provide a latching surface for said releasable
netic yoke supported ‘near one end upon the free end of
means and being movable in response to current overload
said current responsive bimetallic member, said magnetic
through said circuit breaker to effect release of said re
yoke having a body portion extending toward the ?xed
leasable means, means for compensating said circuit
end of said current responsive bimetallic member, a mag
breaker current responsive means for ambient tempera
netic armature member supported upon said yoke mem
ture and operatively related with said magnetic ‘armature
ber and extending generally parallel to said yoke, ‘a hook
and bimetallic member to restrict relative movement be
extension on the ?xed end of said magnetic yoke, said
tween said magnetic ‘arma'ture and bimetallic member
hook being in cooperating alignment with said magnetic
through one range of ambient temperature, ‘and means
armature at the unsupported end thereof and at the side
operatively related with said magnetic armature and bi
thereof ‘away from said yoke, an ambient temperature
metallic member to restrict relative movement between
responsive bimetallic member ?xed to the unsupported
said magnetic armature and bimetallic member upon the
end of said armature member and extending beyond said
occurrence of temperatures higher than said one range
armature at the unsupported end thereof, said ambient
of temperature.
temperature responsive bimetallic member being mov
15. ‘In an automatic electric circuit breaker having sep
arable contacts and means releasable to e?iect separation 55 able in response to the movement of said current respon
sive bimetallic member to move said magnetic armature
of said contacts, current responsive means for effecting
Ll ember to effect release of said releasable means, said
the release of said releasable means upon the passage of
hook extension being movable with said current respon
an overload current through said circuit breaker compris
sive bimetallic member to move said magnetic armature
ing a bimetallic member ?xed at one end within said
member to effect release of said releasable means so as
circuit breaker and adapted to be heated in response to
to eliminate said ambient temperature compensation.
the flow of current through said circuit breaker, a mag
18. in an automatic electric circuit breaker having
netic yoke supported near one end upon the free end of
separable contacts and means releasable to effect separa
said current responsive bimetallic member, said magnetic
tion of said contacts, current responsive means for effect
yoke having a body portion extending toward the ?xed
ing the release of said releasable means upon the passage
end of said current responsive bimetallic member, a mag_
of an overload current through said circuit breaker com
netic armature member supported upon said yoke mem
prising a bimetallic member ?xed at one end within said
ber and extending generally parallel to said yoke, an
circuit breaker and adapted to be heated in response to
ambient temperature responsive bimetallic member ?xed
the how of current through said circuit breaker, a 'U
to the unsupported end of said armature member and ex
shaped magnetic yoke ?xed near one end upon the free
tending beyond said armature at the unsupported end
end of said current responsive bimetallic member and
thereof, said ambient temperature responsive bimetallic
having its body portion extending toward the ?xed end
member being movable in response to movement of said
of said current responsive bimetallic member with the
current responsive bimetallic member to effect release of
legs thereof surrounding said bimetallic member, said
said releasable means, and means integral with said yoke
legs
of said yoke‘ member at said extended end present
and adapted to engage said magnetic armature member 75
ill
7
ing hinge posts on the opposite side of said bimetallic
member from the side on which said yoke is ?xed thereto,
a magnetic armature member pivotally supported on said
hinge posts and extending generally parallel to said hi
metallic member and the legs of said U-shaped yoke,
an ambient temperature responsive bimetallic member
?xed to the unsupported end of said armature and extend
ing beyond said armature at the unsupported end thereof,
said ambient temperature responsive bimetallic member
lg
separable contacts and means releasable ot effect separa
tion of said contacts, current responsive means for effect
ing the release of said releasable means upon the passage
of an overload current through the circuit breaker com~
prising a bimetallic member ?xed at one end within said
circuit breaker and adapted to be heated in response
to the ?ow of current through said circuit breaker, a mag
netic yoke supported near one end upon the free end of
said current responsive bimetallic member and having its
being movable in response to movement of said current
responsive bimetallic member to eit‘ect release of said 10 body portion extending toward the ?xed end of said cur
rent responsive bimetallic member, a magnetic armature
releasable means to etfect separation of said contacts in
member
supported upon said yoke member and extend
response to overload current ?ow through said circuit
ing generally parallel to said yoke, said armature being
breaker, and means on one of said legs or" said magnetic
formed to provide a latching recess for said releasable
yoke extending into engage‘able alignment with said mag
means,
a resilient latch piece inserted in said latching
netic armature at the unsupported end thereof and at
recess and having an extending end bent over around
the side thereof away from said yoke, said means being
the free end or“ said armature, said releasable means
movable with said magnetic yoke and being spaced from
resting
upon said latch piece in latched condition and
said armature at normal 1ambient condition whereby said
riding on said extending end in movement to latched con
means engages said armature at high ambient conditions
dition, an ambient temperature responsive bimetallic
so as to limit said ambient temperature compensation
member
?xed at one end to the unsupported end of said
and eifect release of said releasable means.
armature, said ambient temperature responsive bimetallic
19. In an automatic electric circuit breaker having sep
member having a portion of its ?xed end extending into
arable contacts and means releasable to effect separation
said latching recess to form a latch surface and having
of said contacts, current responsive means for effecting the
its free end extending beyond said armature at the un
release of said releasable means upon the passage of an
overload current through said circuit breaker comprising
supported end thereof, said ambient temperature respon~
sive ‘bimetallic member being movable in response to the
a bimetallic member ?xed at one end within said circuit
movement of said current responsive bimetallic member
breaker and adapted to be heated in response to the
?ow of current through said circuit breaker, a magnetic 30 to release said releasable means to effect separation of
said contacts in response to current overloads through
yoke supported near one end upon the free end of said
said circuit breaker.
current responsive bimetallic member and having its body
22. in an automatic electric circuit breaker having sep
portion extending toward the ?xed end of said current re
arable
contacts and means releasable to effect the separa
sponsive bimetallic member, a magnetic armature mem
tion of said contacts, current responsive means for ef
ber supported at one end on said yoke member and ex
r’ectino the release of said releasable means upon the
tending substantially parallel to said yoke, said armature
passage
of an overload current through said circuit
member having a latching surface formed thereon for
breaker comprising a bimetallic member ?xed at one end
said releasable means, a latch piece overlying said latching
within said circuit breaker and adapted to be heated in
surface, an ambient temperature responsive bimetallic
member being ?xed to the unsupported end of said arma 40 response to the ?ow of current through said circuit break
er, a magnetic yoke supported near one end upon the
ture and extending beyond said armature at the unsup
ported end thereof, said ambient temperature responsive
bimetallic member being movable in response to move
ment of said current responsive bimetallic member to
move said armature member to release said releasable
means to eifect separation of said contacts in response
to current overloads through said circuit breaker.
26. In an automatic electric circuit breaker having
separable contacts and means releasable to e?ect separa~
tion of said contacts, current responsive means for e?ecting
the release of said releasable means upon the passage of an
overload current through said circuit breaker comprising a
bimetallic member ?xed at one end Within said circuit
breaker and adapted to be heated in response to the flow of
current through said circuit ‘breaker, a magnetic yoke
supported near one end upon the free end of said current
free end of said current responsive bimetallic member,
sai magnetic yoke having a body portion extending to
ward the ?xed end or" said current responsive bimetallic
member, a magnetic armature member supported on said
yoke member and extending generally parallel to said
yoke, a cutout Window in said magnetic armature de
?ning a latch suriace, a latch piece inserted in said win
dow and adapted to cooperate with said releasable means
to provide a hard latch surface therefor, said magnetic
armature being movable in response to current overload
through said circuit breaker to elfect release of said re
leasable means, means for compensating said circuit
breaker for ambient temperature, and means on said yoke
adapted to cooperate with said magnetic armature for
limiting said ambient temperature compensation.
23. The method of joining a bimetal, ?exible conductor
and magnetic yoke in an automatic electric circuit breaker
extending toward the ?xed end of said current responsive
by welding to provide good electrical contact and to pre
bimetallic member, a magnetic armature member sup
ported at one end on said yoke member and extending
vent fatigue failure due to ?exing, comprising expressing
substantially parallel to said yoke, said armature mem 60 at least a pair of nibs from said magnetic yoke to de
ber having a latching recess formed thereon for said
?ne a valley therebetween, placing said ?exible conductor
releasable means, a latch piece inserted in said latching
between said nibs and within said valley, assembling said
recess, said latch piece being ?xed to said armature and
bimetal, ?exible conductor and magnetic yoke with said
having one end thereof extending beyond said armature,
?exible conductor between said yoke and said bimetal
1an ambient temperature responsive bimetallic member 65 and in said valley, squeezing said assembly to press said
being ?xed to the unsupported end of said armature and
nibs into the associated surface of said bimetal, and
extending beyond said armature at the unsupported end
passing a welding current through said assembly to fuse
thereof, said ambient temperature responsive ‘bimetallic
responsive bimetallic member and having its body portion
member being movable in response to movement of said
said bimetal, ?exible conductor and yoke.
24. A circuit ibreaker having separable contacts, a mov
current responsive bimetallic member to move said arma 70
able
trip member having an opening therein, means on one
ture member to release said releasable means to effect
side of said trip member releasable to effect separation of
separation of said contacts in response to current over
said contacts, said releasable means having a latch por
loads through said circuit breaker.
21. In an automatic electric circuit breaker having
tion extending into said opening in said trip member, an
ambient temperature responsive bimetal element mounted
3,098,136
13
on said trip member on the side thereof opposite said
releasable means and having a latching surface extending
into said opening in said trip member for engaging said
latch portion to releasably restrain said releasable means,
a trip device comprising a current responsive bimetal
element for moving said trip member in response to over
load currents, and said ambient temperature responsive
bimetal element ?exing to compensate said trip device
for changes in ambient temperature.
14
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,568,423
2,619,561
2,624,816
2,656,437
2,703,351
2,813,167
Walker et al. ________ __ Sept. 18, 1951
Swingle _____________ __ Nov. 25,
Bingenheimer __________ __ I an. 6,
Allen _______________ __ Oct. 20,
Hulbert _____________ __ Mar. 1,
1952
1953
1953
Bingenheimer et a1 _____ __ Nov. 12,
1957
1955
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