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Патент USA US2119459

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May 31, 1938.
'
M, GUETT
2,119,459
ELECTRIC cmcum BREAKER WITH OVBRLOAD-RELEASE
Filed April 27, 1956
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\NVENTOR
MONROE GUETT
BYv HIS
ATTORNEYS
2,119,459
Patented May 31,, 1938
UNITED STATES
PATENT OFFICE
2,119,459
ELECTRIC CIRCUIT BREAKER WITH OVER-
I
LOAD RELEASE
1
Monroe Guett, Hartford, Conn., assignor. to The
Arrow-Hart & Hegeman Electric Company,
Hartford, Conn, a corporation of Connecticut
Application April 27, 1936, Serial No. 76,691
25 Claims. (Cl. 200-416)
This invention relates to snap-acting electric
circuit breakers of the type having current re
sponsive means for tripping the breaker to open
mounted in a casing ID of insulating material,
the casing preferably being long and narrow and
having a wire terminal plate I2 secured to the
circuit position upon the occurrence of an over
bottom of the casing at the left end as viewed in
v5 load in the circuit. More particularly the in
vention relates to manually and automatically‘
operable snap-acting electric circuit breakers
which may be tripped to open position upon the
operation of a bimetallic current responsive de
vice.
'
In certain prior switches of the type to which
this invention relates there occurred a time de
lay between the operation of the thermal over
load device and the initial movement of the con
18 tact to open circuit position.
It is an object of my invention to provide a
circuit breaker of the above type in which actu
ation of the current responsive means trips the
overload mechanism and at once starts moving
20 the movable contact to open circuit position.
Another object of my invention is to provide a
circuit breaker of the above type with means
independent of the manual snap-acting mecha
nism, which will cause the contacts to start sep
25 arating immediately upon actuation of the cur
rent responsive device and which will operate
whether or not the manual operating means is
operative.
Other objects and ‘advantages of my invention
30 will become apparent as it is described in con
nection with the accompanying drawings.
In the
drawings—
-
-
_
Figure I is a side elevation view, partly in sec
tion, of a circuit. breaker embodying the prin
ciples of my invention. The parts are shown in
closed circuit position.
.
Figure 2 is a side elevation view of a circuit
breaker shown in Figure 1 with the parts in open
circuit position, certain of the parts being broken
40 away for the purpose of illustration.
Figure 3 is a view similar to Figure 2 but with
ing screw I6 is provided in the end of the termi
nal plate by means of which feed wires may be
connected to the breaker. Upon the other end 10
of the terminal plate I2 is mounted a ?xed con
tact button l8 with which cooperates a movable
contact button 20 which is mounted upon the
end of a movable contact arm 22 of conducting
material. This contact arm is ‘mounted upon a 15
pivoted contact carrier designated generally by
numeral 24, and is hereinafter more fully de
scribed.
'
At the right end of the casing there is mounted
a terminal member 26 stamped from sheet metal 20
in Z-shape. This member is secured to the casing
by a bolt 28 passing through the bottom of the
casing and taking into the upper horizontal por
tion of the terminal member. ‘A terminal screw
30 takes into a screw threaded aperture in the 25
lower horizontal portion 26b of the terminal
member for the connection of feed wires to the
terminal. A lateral extension 32 from the upper
horizontal portion of the terminal member 26
is bent upwardly at right angles to that hori
zontal portion.
To this upturned extension 32
an inverted U-shaped bimetallic member 34 has
the end of one of its legs riveted or otherwise suit:
ably secured. (See Fig. 1.) The end of the other
leg of this U-shaped bimetallic member is se
cured to a conducting angle member 36 by means
of
a rivet
or
other
suitable
means passing
through the vertical leg of the angle member. A
securing bolt 38 piercing the bottom of the casing
takes into the horizontal leg of the member 36 40
and holds it upon the bottom of the casing.
A
the parts in the position they take after the
?exible conductor 40 is electrically connected
breaker has been tripped .open by an overload
with the member 36 .by means of a screw 42.
This conductor 40 is also connected with the end
current.
45
Fig. 1. A screw l4, projecting through the bot
tom of the casing and taking into threaded ap
erture in the plate, secures it in place. The bind
’
Figure 4 is an end elevation view of my inven
tion, partly'in section, taken along the lines 4——4
of Figure 1.
Figure 5 is a horizontal section view of the
switch frame and associated parts, the section
50 being taken along line 5-—5 of Figure 1.
Figure 6 is-an exploded view showing, in per
spective, certain of the parts which are employed
to connect the movable contact with the actu
ating mechanism.
Referring to the drawings, the parts are
66
of contact arm 22 by a screw 44 thus completing
the electrical path through the breaker from the
terminal 26 through the bimetallic member 34
and its supporting bracket 36, conductor 40, mov
able contact arm 22 and movable and ?xed-con
50
tacts 20 and I8 to terminal I2.
The means for moving the contact 20 under
normal conditions manually are mounted upon a
frame designated generally by the numeral 50.
The frame may be stamped from sheet metal
providing parallel side plates 50“ and 50” which 55
2.
2,119,459
are connected at their left ends as viewed in
Figure 5 by a web 50°. For supporting the frame
upon the casing there are provided at the bottom
edges of the side plates 51‘!a and 50b out-turned
feet 50(1 which rest upon protuberances IOP from
the inside surfaces of the walls of the casing Ill.
For manually operating the switch there is pro
vided a hooked shaped lever 52 which is pivotally
mounted upon a pivot pin 54 secured in the side
plate 50a of the frame. A collar 58 is positioned
between the manual lever 52 and the plate 58a
to space the lever from the plate and position it
centrally in the frame and the casing. A handle
58 of insulating material is molded upon the up
15 per end of the manual lever. Snap-acting means
consisting of a coiled tension spring 60 is pro
vided for moving the movable contact with a snap
motion during manual operation of the breaker.
This spring 60 has its upper end secured to the
20 upper portion of the manual lever directly be
neath the handle 58 in any suitable fashion, while
the lower end of this spring 60 is secured to the
transverse portion of a flat U-shaped member or
yoke 62 which is stamped from sheet metal. The
25 ends of the legs of this yoke engage in inverted
complementary V-shaped bearing notches 64
which are provided in the side plates 508L and 51']b
of the frame.
‘
As the manual lever 52 is moved from the po
30 sition of Figure l to the position of Figure 2,
the line of action of the spring 60 passes through
the plane of the yoke 62 and causes the yoke
to move from its engagement with one side of
the V-notches into engagement with the other
35 side with a snap motion.
A reverse action takes
place in the movement of the leverv from the
Figure 2 position to the position shown in Fig
ure 1.
In order to transmit the motion of the yoke 62
40 to the movable contact a pair of identical trian
gular arms 6611 and 6B“ are secured to the legs
of the yoke 62 by means of outward extensions
of the legs of. the yoke passing through com
plementary apertures in the arms. These exten
of horizontally extending, vertically parallel
arms 8221 and 82b of a supporting bracket desig
nated generally by numeral 82.
This pivot 80
is ?xed with relation to the casing. A horizontal
web 820 joins the edges of arms 8211 and 82‘0 at
the ends away from pivot 80, and affords means
to mount the bracket 82 on the angle bracket
36.
The terminal screw 42 serves the double
purpose of attaching the conductor 40 and the
supporting bracket 82 to the angle bracket 36.
10
.
It may now be observed that as the yoke 62
moves from right to‘left, that is from the posi
tion of Figure 1 to the position of Figure 2 in re
sponse to the movement of the handle 58, the
arms 66 will rock in a'clockwise direction about
the axis of the yoke 62. This will carry the toggle
links 10 and 12 while in their straightened con
dition in an upward direction thereby exerting
clockwise pull upon the contact carrier 24 about
its pivot 80 thus causing the movable contact 20 20
to separate from the ?xed contact 18. Upon‘ re
verse movement of the handle back to the posi~
tion of Figure 1 the arms 66 will move counter
clockwise forcing the toggle links 10 and 12
downwardly and turning the contact carrier 24 25
counterclockwise about its pivot 80 thereby en
gaging the contact 20 with the contact l8.
In order to keep the toggle links in straight- _
a
ened condition they are mounted with the arm
12“ against the inside of arm ‘(0b and with the 30
arm ‘I2a against the outside surface of the arm
10“, and small circular protuberances ‘H and 13
are pressed out from the inner faces of the en
larged semi-circular portion of the arm 12“ in
positions spaced approximately 90° apart, one 35
of these protuberances (1|) being at the end
farthest removed from the pivot pin 18. These
protuberances may engage in a complementary
indentation ‘IT ‘in the'middle of arm 1011. In or
der to keep the arms 1013 and 12b and T0“ and .12’!
pressed against each other a compression springr
15 is wound around the pivot pin 14, and has its
opposite ends pressing against the arm ‘I2b and
the arm 10a. Movement of the toggle links be
- yond straightened position is prevented by the 45
nection between the yoke 62 and the arms 66a engagement of the edges of the cross bars ‘HI6
and 12° as may best be observed from Figures
and 66*’, with the arms in parallel planes per
2 and 4.
pendicular to the plane of the yoke.
In order to cause tripping of the breaker upon
Connected to the ends of the arms 56a and 6811
by a pivot pin 68 is one of a pair of toggle link occurrence of an overload there is provided an
members designated generally by the numerals overload member or a yoke designated generally
10 and 12 as best illustrated in Figure 6. These by the numeral 90. This yoke is symmetrical
links are metal stampings of irregular shape as having identical side plates, in the form illus
may be observed by a study of Figure 6. Link trated in Figure l which are joined by a trans
10 has parallel side arms ‘Illa and 10b which are verse portion 90b at their right ends. The over— 55
joined by a cross bar 70°, the arm ‘Illb having a load yoke 90 is pivotally mounted by a pin 92
large lateral semi-circular extension at one end. upon a supporting bracket designated generally
The link 12 has parallel arms '123 and 12” which by the numeral 94. The supporting bracket 94
are joined by a cross bar 72°, the arm ‘l2a having is a sheet metal stamping comprising a strip of
a large lateral semi-circular extension at one metal as wide as the web 50“ of the frame 50, the
end. The links 10 and ‘12 are pivoted together strip being bent into a right angle providing a
sions are peened over to make a permanent con
by a pin 14 passing transversely through the side
arms of the links concentrically with the semi
circular extensions. The link 12 is pivotally con
nected with the contact carrier 24 by a pin.'l8
transversely extending thru the end spaced from
pin 14. The contact carrier 24 is a U-shaped
metal stamping having side plates 24a and 24b
parallel to but within the arms of the link 12.
The side plates are connected by a transverse web
portion 24°. The transverse web portion 240
has mounted on it the movable contact arm 22
by a screw or other suitable means. The carrier
24 is pivotally mounted by means of a pivot pin
75 80 transversely extending thru the ends of a pair
vertical portion 940 riveted against the web 500
and a horizontal portion 94‘1 having a pair of
opposite lateral extensions bent up to form par
allel vertical mounting lugs 94a and 94b, The
pivot pin 92 passes thru these lugs and thru the
free ends of the overload yoke 90. A torsion
spring 95 is wound around the pivot 92 and tends
to rotate the overload yoke 90 in counterclock
wise direction as the device is viewed in Figures
1, 2 and 3. This tendency is resisted by a catch
900 which is rigidly secured to the center of the
transverse portion 91.‘!t of the overload yoke 90
and extends at right angles thereto. The catch
906 engages with the edge of a catch plate .345
3
2,119,459
which is secured to the transverse portion, of the
bimetallic element 34 and is suitably insulated
therefrom.
2. In an overload circuit breaker, a ?xed con
In order that counterclockwise movement of
the overload lever 98 may be transmitted to
the contact carrier 24, the upper ends of a pair
of identical links 96 are connected to the side
plates of the overload member 90 at points in
the midportio'ns of those plates. The lower ends
10 of the links ‘are pivotally connected to the con
tact carrier 24 by a pin 98 passing through the
lower ends of the links 96 and through the side
Plates 24B and 24b of the contact carrier. In
clined slots 245 are provided in the plates 2!“
15 and 24b in which the pin 98 works. Normally
the pin 98 will be very close to the upper end of
the slot so that at the instant the bimetallic mem
ber 34 ?exes to the right (see Figure 3) upon the
to
occurrence of overload and releases the overload
member 90, the motion of the overload member
will be transmitted through the links 96 to the
carrier 24. 'When the pin 98 is in its normal
closed circuit position in the upper end of the slot
245, a tripping ?nger 1.2% which extends laterally
from the arm 12*, lies on top of the pin 98 so
that before the pin 98 engages the upper end of
the slot it rotates the ?nger ‘l2t and toggle lever
12 counterclockwise to break the toggle. Thus
when ‘the pin 98 engages the upper end of the slot
the contact carriage 24 is free to pivot to open cir
cuit position.
'
It should be observed that during manual oper
ation of the switch the toggle is over-set ‘and the
action of the arms 66“ and 66'’ will tend to keep
the toggle in over-set or straightened position.
In order to reset the device after it has been
tripped by an overload, the handle is moved from
“on.” position, as shown in Figure 3, to the "oiT”
position shown in Figure 2 and a pair of cylin
drical bearing cams I 9.0, which project perpen
dicularly from the hand lever 52' beneath the
handle 58 engage with inclined or cam surfaces
905 of the overload member 90 to depress the
c'?/erload member or-move it in‘clockwise direc
tion‘ until the catch 90° engages with the_edge of
catch plate 345 of the bimetallic member again.
During this movement the line of action of the
spring 60 will have moved through dead-center
position and caused the yoke 62 to move to the
position of ‘Figure 2 thereby moving the arms 68“
and 66b to open circuit position and straightening
’ out the toggle links ‘Ill and ‘I2.
From the foregoing it will be observed that I
have provided a switch in which the overload
tripping mechanism is independent in its action
of the manual operating means and will operate,
whether or not the manual operating means
becomes stuck or inoperative. ' At the same time ‘
I have provided overload tripping means which
operates to break the toggle and to start separat
ing movement of the contacts with one movement
when the current responsive element moves to
release the overload operating mechanism.
Many modi?cations within the scope of my in
vention will occur to those skilled in the, art,
therefore I do not limit myself to the speci?c em
bodiment of the invention illustrated and de
scribed.
I claim—
said overload mechanism being operable while
said manual snapping spring remains stationary.
.
1. In an overload circuit breaker, a ?xed con
tact, a movable contact mounted‘ for movement
about a ?xed pivot, manually controlled snapping
mechanism including a spring for operating said
movable contact, overload mechanism for causing
movement of said movable contact‘ with a snap,
tact, a movable contact mounted for movement
about a ?xed pivot, manually controlled snapping
means for operating said movable contact, over
load operating means for causing separating
movement of said contacts with a snap, a collaps
ible connection between said manual means and
said movable contact, means for collapsing said 10
connection upon operation of said overload
means, means maintaining said connection in
operative condition while the breaker is being
manually operated, a lost motion connection be
tween said movable contact and said overload 15
snapping means. permitting movement of said
manual snapping means while said overload
means remains stationary.
3. In an overload circuit breaker, a ?xed con
tact, a movable contact mounted for movement 20
about a ?xed piviot, manually controlled snapping
means for operating said movable contact, over
load operating means for causing separating
movement of said contacts with.a snap, connect
ing means between said manual snapping means
and said movable contact permitting movement
of said overload means while said manual snap
ping means remains stationary.
4. In an overload circuit breaker, a ?xed con
tact, To), movable contact mounted for movement 30
about a ?xed pivot, manually controlled snapping
means for operating said movable contact, over
load operating means for causing separating
movement of said contacts with a snap, connect
ing means between said overload snapping means 35
and said movable contact permitting movement
of said manual snapping means while said over
load snapping means remains stationary, and
connecting means between said manual snapping
means and said movable contact permitting
movement of said overload snapping means while
said manual snapping means remains stationary.
5. In an overload circuit breaker, a fixed con
tact, a movable contact mounted for movement
about a ?xed pivot, manually controlled snapping
means for operating said movable contact, over
load operating means for causing separating
movement of said contacts with a snap, a lost mo
tion connection between said overload snapping
means and said movable contact permitting op 50
eration of the movable contact by said manual
snapping means while said overload snapping
means remains stationary, and connecting means
between said manual snapping means and said
movable contact permitting operation of the mov
able contact by said overload snapping means
while said manual snapping means
remains
stationary.
6. In an overload circuit breaker, a ?xed con
tact, a movable contact mounted for movement
about a ?xed pivot, manually controlled snapping
,means for operating said movable contact, over
load operating means ior causing separating
movement of said contacts with a snap, connect
ing means between said overload snapping means 65
and said movable contact permitting operation of
the movable contact by said manual snapping
means while said overload snapping, means re
mains stationary, 'anda collapsible connection be
tween said manual snapping means and said mov
70
able contact permitting operation of said mov
able contact by said overload snapping means
while said manual snapping means remains sta
tionary.
,
'7. In an overload circuit breaker, a ?xed con
75
2,119,459‘
tact, a movable contact mounted for movement
about a ?xed pivot, manually controlled snapping
means for operating said movable contact, over
load operating means for causing separating
movement of said contacts with a snap, a lost
motion connection between said overload snap
ping means and said movable contact permitting
operation of the movable contact by said manual
snapping ‘means while said overload snapping
10 means remains stationary, and a collapsible con
circuit opening position, a lost motion connection
between said overload snapping means and said
movable contact permitting operation of the mov
able contact by said manual snapping means
while said overload snapping means remains sta
tionary, and a collapsible connection between said 10
nection between said manual snapping means and
manual snapping means and said movable con
said movable contact permitting operation of said
tact permitting operation of said movable ‘con
tact by said overload snapping means while said
manual snapping means remains stationary.
movable contact by said overload snapping means
while said manual snapping means remains sta
15
about a ?xed pivot, manually controlled over
center spring means for snapping said movable
contact into and out of engagement with said
?xed contact, overload operating means biased to
tionary.
-
'8. In an overload circuit breaker, a ?xed con
tact, a movable contact mounted for movement
about a ?xed pivot, manually controlled over- .
13. In an overload circuit breaker, a ?xed‘con
tact, a movable contact mounted for movement
about a ?xed pivot, manually controlled over
center spring means for snapping said movable
center spring means for snapping said movable contact into and out of engagement with said
contact into and out of engagement with said ?xed contact, overload operating means biased to
?xed contact, overload operating means biased ' circuit opening position, a collapsible connection
to, circuit opening position, connecting means between said manual snapping means and said
between said manual snapping means and said movable contact, means for collapsing said con
movable contact permitting movement of said nection and simultaneously separating said mov
able contact from said ?xed contact by the ini
26 overload means while said manual snapping
means remains stationary.
9. In an overload circuit breaker, a ?xed con
tact, a movable contact mounted for movement
about a ?xed pivot, manually ,controlled over
center spring means ‘for snapping said movable
contact into and out of engagement with said
?xed contact, overload operating means biased
to circuit opening position, connecting means be
tween said overload snapping means and said
movable contact permitting movement of said
manual snapping means while said overload snap
ping means remains stationary, and connecting
means between said manual snapping means and
said movable contact permitting movement of said
40 overload snapping means while said manual
snapping means remains stationary.
10. In an overload circuit breaker, a ?xed con
tact, a movable contact mounted for movement
tial movement of said overload means.
14. In an overload circuit breaker, a ?xed con
tact, a movable contact mounted for movement
about a ?xed pivot, manually controlled over
center spring means for snapping said movable
contact into and out of engagement with said
?xed contact, overload operating means biased to
circuit opening position, a collapsible connection
between said manual snapping means and said
movable contact, means for collapsing said con
nection and simultaneously separating said mov
able contact from said ?xed contact by the initial
movement of said overload means and means to
maintain said collapsible connection in operative
condition during manual operation of the breaker.
15. In an overload circuit breaker, a fixed con
tact, a movable contact mounted for movement
about a ?xed pivot, manually controlled over
center spring means for snapping said movable
contact into and out of engagement with said
Contact into and out of engagement with said . ?xed contact, overload releasable means biased to
?xed contact, overload operating means biased to I circuit opening position, current responsive means
about a ?xed pivot, manually controlled over
center
spring means for snapping said movable
45
circuit opening position, a lost-motion connec
tion between said- overload snapping means and
50
said movable contact permitting operation of the
movable contact by said manual snapping means
while said overload snapping means remains sta
tionary, and connecting means between said man
ual snapping means and said movable contact
restraining the bias of said overload means, a
collapsible connection between said manual snap
ping means and said movable contact, means to
collapse said connection and separate said mov
able contact from said ?xed contact by the move
ment of said overload releasable means.
'
16. In an overload circuit breaker, a ?xed con
tact, a movable contact mounted for movement
about a ?xed pivot, manually controlled over
center spring means for snapping said movable
contact into and out of engagement with said
11. In an overload circuit breaker, a ?xed con
tact, a movable contact mounted for movement‘ ?xed contact, overload releasable means biased
to circuit opening position, current responsive
about a ?xed pivot, manually controlled over
center spring means for snapping said movable means restraining the bias of said overload
contact into and out of engagement with said means, a collapsible connection between said
?xed contact, overload operating means biased to manual snapping means and said movable con
tact, means to collapse said connection and sepa
circuit opening position, connecting means be
tween said overload snapping means and said rate said movable contact from said ?xed contact
65 movable contact permitting operation of the mov
by‘ the movement of said overload releasable
able contact by said manual snapping means means and means to maintain said collapsible
connection in operative condition during manual
while said overload snapping means remains sta
tionary, and a collapsible connection between said operation of the breaker.
55
permitting operation of the movable contact ‘by
said overload snapping means while said manual
snapping means remains stationary.
70 manual snapping means and said movable con
tact permitting operation of said movable con
tact by said overload snapping means while said
manual snapping means remains stationary.
12. In an overload circuit breaker, a ?xed con
75 tact, a movable contact mounted for movement
1'7. In a circuit breaker, a ?xed contact and
a movable contact engaged therewith, a manual
operating lever, pivotal contact actuating means
including an over-center spring movable by said
lever to operate said movable contact with a
snap, in combination with an overload lever
2,119,459
,pivotally connected with said movable contact
and biased to open circuit position, current re
sponsive means holding said overload lever
against said bias, and a spring providing said bias
of said overload lever and causing said overload
lever and movable contact to move to open cir
cuit position on the occurrence of an overload
without the necessity of movement of said over
center spring.
10
18. In a circuit breaker, a ?xed contact and a
movable contact engaged therewith, a manual
operating lever, pivotal contact actuating means
including an over-center spring movable by said
lever to operate said movable contact with a
15 snap, in combination with an overload lever
pivotally connected with said movable contact
and biased to open circuit position, current re
sponsive means holding said overload lever
against said bias, said overload lever starting
20 open-circuit movement of said movable contact
with its own open circuit movement upon release
by said current-responsive means.
19. In a circuit breaker, a ?xed contact, and a
movable contact engaged therewith, a manual
25 operating lever, pivotal contact actuating means
including an over-center spring movable by said
lever to operate said movable contact with a snap,
in combination with an overload lever mounted
on a ?xed pivot and having a movable pivotal
30 connection with said movable contact, a second
spring biasing said overload lever to open circuit
position and causing said lever and movable con
tact to move to open circuit position upon the
occurrence of an overload without the necessity
35 of movement of said over-center spring, and
current-responsive means holding said overload
lever against said bias.
'
20. In a circuit breaker, ?xed and movable con
5
overload, said overload means including a lever
pivoted about a ?xed pivot and having a movable
pivotal connection with said movable contact,
means biasing said overload lever to open circuit
position independently of said manual operating
means.
22. In a circuit breaker, ?xed and movable
contacts, manual operating means for moving
said movable contact into open circuit position
with a snap, overload operating means for mov
10
ing said movable contact to open circuit position
with a snap independent of said manual operat
ing means, said manual and overload operating
'means having separate springs urging said con
tacts apart, said manual and said overload oper 15
ating means having separate pivotal connections
with said movable contact.
23. In a circuit breaker, ?xed and movable con
tacts, manual operating means for moving said
movable contact into open circuit position with a
snap, overload operating means for moving said
movable contact to open circuit position with a
snap independent of said manual operating
means, said manual and overload operating
means having separate springs urging said con 25
tacts apart, said overload operating means in
cluding a lever having a pivotal connection with
said movable contact, said movable contact hav—
ing a separate pivotal connection with said
30
manual operating means.
24. In a circuit breaker, ?xed and movable
contacts, manual operating means ‘for moving
said movable contact between open and closed
circuit positions, overload operating means sepa
rate from said manual means for moving said
movable contact to open circuit position with a
snap on overload, said overload means including
a lever pivoted about a ?xed pivot and having a
tacts, manual operating means for moving said
movable pivotal connection with said movable
movable contact to open circuit position with a
snap, overload operating means separate from
said manual means for moving said movable con
contact and means biasing said overload lever 40
to open circuit position.
tact to open circuit position with a snap on over
tacts, manual operating means for moving said
movable contact between open and closed circuit
positions, overload operating means separate from 46
load, said overload means including a lever pivot
ed about a ?xed pivot and having a movable
pivotal connection with said movable contact,
and means biasing said overload lever to open cir
cuit position.
21. In a circuit breaker, ?xed and movable
50 contacts, manual operating means for moving
25. In a circuit breaker, ?xed and movable con
said manual means for moving said movable con
tact to open circuit position with a snap on over
load, said overload means including a lever
pivoted about a ?xed pivot and having a movable
pivotal connection with said movable contact and
said movable contact to open circuit position with
means biasing said overload lever to open circuit
I a snap, overload operating means separate from
position independently of said manual operating
said manual means for moving said movable
contact to open circuit position with a snap on
means.
MONROE GUE'I'I‘.
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