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Nov. 16, 1948.
2 Sheets-Shoat 1.
Original Filed June 25, 1943
\\\\\\w LVN-Er.,
Fred G.
Z 6M
H'is Abbor'ne?gi
‘Nov. 16, 1948..
_ cmcun BREAKER
2 sheets-sheet 2
original Filed June 25, 1943
Fred G. Von Hoor~n,
by 51f“; (5W '
His Attorney
K‘ 2,454,106
Patented Nov. '16, 1948
iunrrao s'rAras2,454,196
cmcm'r BREAKER _
Connq assignor
oorn, Bridgepo . a corporation 0
t FredRG. you HElectric Company,
to General
New York
Serial Non
vigil!!!v application vlune. 25, 1943,’dated
is‘ application - April
1 1941.
1,1941, Serial No. 139,185
5 Claims.v
101. zoo-11c) ‘
sisting of two links I! and 20, the‘ lower end of
The present application constitutes a division
ding application Serial No. 492,284
now Patent No. ‘2,422,508, is
sued June 11, 1947, and entitled Circuit breaker,
the link ,20 being pivotally connected by a pivot
end of the link I! is connected
by pivot
fixed 22
trip arm
. intermediate point
to open th
and which is assigned to the same “assignee as the
present application.
, breaker byv moving
handle the handle being
in rth'ea drawing,
an inverted U-shaped operating
My invention relates to circuit breakers, more
particularly to manually operated current respon
sive circuit break
member, only one arm 25 of which is seen, which‘
embraces the supporting 'framework i2 and has
of its arms pivoted on lateral projections
object a sim
ple and‘ reliablecircuitcircuit
28 secured to the rframework. A pair of helical
holding the ‘the event or an overload,
tension springs 21,‘ only
are provided on opposite
calibrating the
d a se
to the handle 25. Thus whenleft
the until
pivoted arm on the supporting frame
‘breaker which cooperates
d with the normally secured
‘the circuit breaker in such
29. The manually opened position of the mech
anism is illustrated in Fig. 4.
Normally the left-hand end 30 oi the arm 23
is secured by engagement with the end ofthe
a screw
die to prevent opening of the circuit
. I also provide an
left of the pivot 22.
the pivot 28- toward the left
thereby opening the circuit breaker. In its open
position the projection i3 rests against a stop pin
the cur
closing position,
is held by '
rent responsively held tripping member
which is shown.
the toggle. Each
one end
28 of the
and its other upper end connected
my invention ‘in one form I
2| to the operating projection ll,
electric shunt for the current
3! carried by a thermostat 32, whereby
is secured to the
23 is held against movement in a clockwise direc
responsive device, which‘ shunt
circuit breaker on the exterior of the casing so
tion about its pivot 32a by the force applied by
begreadily removed and changed to 80
the occurrence of a prede
of the circuit breaker.
32 moves toward ,the left
d the handle, I_ mount the
handle for spring pressed engagement with‘ a wall
of the enclosing casing.
far enough to release the arm 23 which effects
the -
arm to an open circuit
For more complete understanding oi my inven
tion, reference shouldbe had» to the accompany
ing drawingfFlg. 1
a circuit breaker pro
view mainly in section or Fig. 2 is a fragmentary
invention; the line 2-2 of Fig. 1
the mechanism is illus
looking in
Fig. 3 is
a fragmentary view or a part or the
ure 4 is a side elevation partially in section of the
circuit breaker shown in Fig. 1, but with the mech- ‘
anism in the manually
position; and Fig. 5
is a similar elevation partially in section or the
circuit breaker, but with the mechanism in the
overload tripped position.
In carrying‘ out my invention in one form I
provide a spring contact am Hi mounted on a
pivot ll between two upright sides of a support
ing ‘framework i2, only one side oi which is
shown, The arm comprises a
trated embodiment, a two link toggle is used,- only
the single link is is actually required, the second
link 20 being for-the purpose of increasing the
motion of the contact, arm 10 and the velocity of
motion of the moving contact when the link is
is snapped by the spring from one position to
order that the arm 23 may be held in the
shown in Fig. l of the drawing, even
‘ position
though it has been released by the thermostat, l’.
have provided .a lever 33 forming a connecting
member mounted on the fixed pivot 32a. The
lower end of this lever engages the operating
end arm
7 25 carrying the handle, while its
oted on the pivot H and provided with a stop
projection 13 and an
This member has secured to its
rivets ii, the spring arm ill on
is secured a movable contact 11 cooperating with
a stationary contact 18.
held in its
As shown in Fig. 1, the breaker a toggle con 60
closed circuit position by means of
in the illus-..
gages an
‘which are
(not shown) on the opposite side of the tram
work mounted also on the pivot 32a. The upper
ends of these arms are connected toiether by a
vertically extending portion 34 on the arm 23.
an aperture at each en ,,
The lever 33 furthermore is so arranged that
when the arm 23 is in its normal secured posi-
tures the conduc ors 38 and 46 extend. Thus to
remove the shunt the nuts 49 and 50 are removed
pivot 26 so that the arm is in appreciable spaced
nuts 50 and BI tightly down against it so as to
,~ relation from the stop 38 It will be observed 23 term a good mechanical, and also good electrical,
that the forces arerapplied entirely by the helical
spring 21.‘ but since it is acting almost directly
on the arm 23, its force applied to the arm 23
the relatively
smallof amount
of toits 15
which opposes
the handle
connection at each end ‘between the shunt and
the conductors themselves. , The outer nut 43 on
the conductor 38 is the usual clamping nut for
nal electrical connection with an exter
ward the left hand. Therefore, the handle is
moved slightly away‘ from stop 38.
However, ii’ it is desired to hold the circuit
Also, adjustment of the current response oi’ the
thermostat, or rather of the amount of de?ection
required 01' the thermostat to release the arm 23,
done by moving the handle‘24 toward the right 20 It is contemplated, however, that this screw will
ment with the arm 23 moves the arm slightly in a I 25 effected by applying a suitable shunt 41
a ma
4 is held ?rmly in the exact position shown in 30 understood that any current value above the par- _
that the contact arm will be held against open~ 35 closed manually by means of the handle 24, as
ing movement
previously described.
The latching end 30 of the arm 23 is preferably a metal part which is secured to the end of
e electrically insulated from the arm 23
e mechan m as shown, is enclosed in
Another feature 01’ the circuit breaker is a dust
tight and substantially a - and liquid-tight seal
wt e aperture of e casing through which the
hand extends To provide for this seal, the
casing or housing 37 made of a molded electri-
handle is provided with an arcuate portion 52 ex
cally insulating material at the bot
or which
tending in the direction of its motion this arcu
e supporting framework I is secured Electri~
ate portion having for its center the pivot of the
cal connections are made with the circuit break- 45 handle on the projection 26. By means of a com~
mostat 32 whose lower end is electrically and 50 shown in Fig. 2, the arcuate portion 52 with the
contact "3 is mounted on a conducting strap 43 55 ridges in thewupper surface of the casing. Thus
secured to the conductor 39 ‘by a nut 44
as shown in Fig 2, e handle is provided with a
The circuit t rough the circuit breaker beridge 55 and groove 56 on each side of the aper
tween the external connectors 38 and 39 may be
ture through which the handle extend
traced from the connector 38 through the thero facilitate this mounting of the handle on
rnostat 32 to its upper end and then through a 60 the inverted U-shaped metal operating member
on the
of the casing
38 exterior
to the conductor
65 spring
in accordance
with ‘ the force applied by the
54. '
From the conductor 46 a ?exible conductor 48
leads‘ to the end of the Contact arm, and the
A second stop 59 limits ,the movement of the
arm 25 in a counterclockwise direction, and a
circuit then leads through the two contacts and
stop 60 is provided on the frame, against which
the conductor 39 to the exterior oftthe circuit 70 the end of the contact arm comes to rest in the
Calibration or change in the tripping current
value is effected v'ery conveniently from the ex~
open circuit position.
When the arm 23 is moved clockwise on over
load to open the circuit breaker, it can be brought
terior of the casing by interchanging the shunt
‘back with its end 30 in latching engagement with
:onductor 41 for one having a suitable electrical 75 the screw 3| by means of the handle, assuming
that the thermostat is allowed to cool and bring
back into
To direoeiiect
the handle
be moved
in either
when said operating member is held in its closed
3. A position.
circuit breaker comprising a trip arm
mounted on a tilted pivot, current responsive
when the trip arm 23 is' released by the ther- 5 means normally holding. said trip arm in a pre
mostat, the spring 21 causes it to move clockwise
about its pivot 32.. At the same time the trip
arm, by engagement with the cross rod 35, moves
the lever 33 clockwise so that the‘ lever a in turn
determined position, a link having a ?rst end
pivotally mounted on said trip arm at an inter
mediate point 01 said trip arm, a pivoted operat
ing member, an over-center spring having
moves the operating arm 25, counterclockwise l0 ends connected respectively to the other end of
about its pivot 26. This movement of the opersaid link and to said operating member whereby
ating member 25 carries the upper end 01 the
said operating member can be moved to snap
spring 21 toward the pivot 21, the pivot and the
said iink irom one position to another, circuit
spring moving toward each other. when the - control means operated by said link, said trip arm
pivot reaches a position to the right 0! the'center 15 when released by said current responsive means
line of the spring,-the spring snaps the toggle to
biased by said spring to move said ?rst end of
its broken position thereby opening the circuit
breaker. During this opening movement. the
said link toward said spring to e?ect automatic
operation of said circuit control means, and a
spring biases the handle toward the leit to a cen-
lever mounted on a fixed pivot having one end
tral position in which aproiection ii on the oper- 20 arranged for engagement with said operating
ating member it rests against a stop projection
member and its other end in engagement with
82 (Fig. 3) on the trip arm 23. The trip arm 23
. is brought to rest by the engagement oi the cross
said trip arm whereby said operating member
may be held to prevent movement of said trip
5. projection
. 03 on the / frame as 25 arm.
e 4. A circuit breaker comprising a ' trip arm
35 with the
11 the handle it after this automatic opening
mounted on a med pivot, current responsive
is moved toward the left, the engagement oi the
means normally holding said trip arm in a pre
proieotion 8i with the projection 01 on the trip
determined position, a link having a ?rst end
arm 21 effects counterclockwise movement oi the
pivotally mounted on said trip arm .at an inter
am until its leit-hand end is moved downward 30 mediate point of said trip arm, a pivoted operate
to its latching position. On the other hand, it
ing member, an over-center tension spring hav
the handle is moved toward theright hand irom
this central position, its engagement with the
ing its ends connected respectively to the other
end of said link and to said operating member
lever 33 causes this lever to reset the lever 21
whereby said operating member canbe mov
while at the same time the circuit breaker is 35 snap said nk from one position to another, cir
mereleased'by said current
While I have shown a particular embodiment
trip arm when
01 my invention, it will be understood, oi‘ course,
sive means being biased by said spring to move
that I do not wish to be limited thereto since
said ?rst end of said link/toward said spring to
many modifications may be made, and 1 there- 4“ e?ect automatic operation oiv said circuit control
iore contemplate by the appended claims to cover
means, and a lever mounted on said pivot 01
, any such modi?cations as {all within the true
trip arm having one end in engagement with said
spirit and scope oi! my invention
‘What I clai
new an
perating member and its other end arrang
esire to secure y
engagement with said trip arm wh
Letters Patent oi the United states is:
1 The combination in a
pivoted trip arm norm
5 erating member
rcui breaker 01
by said op
eld to prevent move
m ment 0! said trip arm and whereby movem t o
held by a current re-‘
said trip arm hen released
said current re
sponsive means in a predetermined angular posi-
sponsive means produces movement of said oper
tion, means tor moving said trip arm when re-
ating member and said spring toward
by breaker‘,
(1 current
means member
to open 50 end
link. breaker provided
' .
the circuit
a pivoted
5. oi
In a circuit
with a trip
movable in the same angular direction to close
member normally held by a current responsive
the circuit breaker as said trip arm moves to open
means in a predetermined angular position
said circuit breaker, and a lever pivotally
an operating member movable between closed
unted at an intermediate point of said lever ' 55 and open‘ circuit positions to open and close the
and having its ends arranged tor abutting encircuit breaker, the combination therewith of a
gagement with said trip arm and said operating
movabiy mounted connecting member to -
member respectively for causing simultaneous
and said
trip member
operat- '
2. The combination in a er.
circuit breaker or a w ing member is in its closed circuit position so ‘
pivoted trip arm normally held by current responsive means in a predetermined angular p0- sition, means for moving said trip arm when released by said current responsive means to open
that when said operating member is held in its
closed circuit position said trip member is see
against movement when released by said current
responsive means.
the circuit breaker as said trip arrnmoves to open
said circuit breaker. and 6-16"! NW“?! mounts
The following references are of record in the
ed at an intermediate point oi said lever on the
me 0; this
trip arm and via: its ends ar- q},
‘I ranged
with said nip
arm andtor
member respectively
Home ,
> Date
preventing tripping movement oi said trip arm '
Geno ... ......... ..- June 18, 1939
Certi?cate of Correction
Patent No. 2,454,106.
November 16, 1948.
It is hereby certi?ed that error appears in the printed speci?cation of the above
numbered patent requiring correction as follows:
Column 6, line 15, claim 3, after “means” insert the word being;
and that the said Letters Patent should be read with this correction therein that the
same may conform to the record of the case in the Patent O?ice.
Signed and sealed this 29th day of March, A. D. 1949.
Assistant Commissioner of Patents.
Certi?cate of Correction
Patent No. 2,454,106.
November 16, 1948.
It is hereby certified that error appears in the printed speci?cation of the above
numbered patent requiring correction as follows:
Column 6, line 15, claim 3, after “means” insert the Word being;
and that the said Letters Patent should be read with this correction therein that the
same may conform to the record of the case in the Patent Of?ce.
Signed and sealed this 29th day of March, A. D. 1949.
Assistant Gommissioner of Patents.
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