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Патент USA US2130368

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Sept. 20, 1938.
J. SACHS
2,130,368
AUTOMATIC CIRCUIT BREAKER
Filed Aug. 21, 1937
Fig.1 2
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Sept. 20, 1938.
J_ SACHS
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2,130,368
AUTOMATIC CIRCUIT BREAKER
Filed Aug. 21, 1957
2 Sheets-Sheet 2
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Inventor
iasfluf/é?ézjfs
J’ 851%
2,130,368
Patented Sept. 20, 1938
UNITED STATES PATENT OFFICE}
2,130,368
AUTOMATIC CIRCUIT BREAKER
Joseph Sachs, West Hartford, Conn., assignor to
Colt’s Patent Fire Arms Manufacturing Com
pany, Hartford, Conn., a corporation of Con
necticut
Application August 21, 1937, Serial No. 160,249
14 Claims. (Cl. 200-116)
This invention relates particularly to a circuit
breaker of the type disclosed in my Patent No.
1,812,843, dated June 30, 1931. In a circuit
breaker of this type there is provided at least one
stationary contact, a movable contact member
carrying at least one movable contact adapted to
engage the stationary contact, an actuator mov
ably connected with the contact member, an elec
troresponsive latch bodily movable with the con
tact member and normally connecting it with the
actuator for movement in unison therewith, and
an operating means, as for instance toggle links,
connected with the actuator for moving or holding
it and for thus moving or holding the contact
member.
As disclosed in my said prior patent and in my
other prior patents showing circuit breakers of
this general type the latch engages directly with
the actuator. In accordance with the present in
vention, however, the latch engages a movable
trip member which is separate from the actuator
but is normally mechanically connected therewith.
This makes it possible for the actuator and the
latch to be each located in the most advantageous
relationship to the contact member. The actuator
can be located so as to effectively enable the op
erating means to move or hold the contact mem
ber, the major portion of the necessary force being
transmitted directly to the contact member inde
pendently of the trip member and latch.
Preferably the reduction in force transmitted to
the latch is e?ected by mechanismproviding a
plurality of levers having force reducing ratios.
In the accompanying drawings two alternative
embodiments of the invention are shown but it will
be understood that the drawings are intended for
illustrative purposes only and are not to be con
strued as de?ning or limiting the scope of the in
vention, the claims forming a part of this speci?
v cation being relied upon for that purpose.
Of the drawings:
Fig. 1 is a central longitudinal sectional view
through a circuit breaker embodying the inven
tion.
Fig. 2 is a transverse sectional view taken along
the line 2--2 of Fig. 1.
Fig. 3 is a fragmentary transverse sectional view
taken along the line 3--3 of Fig. 1.
Fig. 4 is a view similar to Fig. l but showing the
w parts in the positions which they occupy when the
circuit breaker is opened automatically with the
handle held in closed-circuit position.
Fig. 5 is a view similar to Figs. 1 and 4 but show
ing the parts in open-circuit position.
Fig. 6 is a central longitudinal sectional view
i
through an alternative circuit breaker embody
ing the invention.
‘
Fig. 7 is a transverse sectional view taken along
the line 'I—'I of Fig. 6.
Fig. 8 is a view similar to Fig. 6 but showing the
parts in the positions which they occupy when the
circuit breaker is opened automatically with the
handle held in closed-circuit position.
Fig. 9 is a view similar to Figs. 6 and 8 but show
10
ing the parts in open-circuit position.
Referring to the drawings, particularly Figs. 1
to 5 thereof, I represents as an entirety a casing
or housing which is shown as molded from a suit
able insulating material. This housing is closed
at the sides and is substantially closed at the ends .'
and at the rear, but it is open at the front where
there is provided a removable insulating cover 2
normally held in place by screws 3, 3.
A contact 4 is mounted within the housing I
near the rear thereof, this contact being carried
by a resilient conductor 5 held in place by a screw
6 connected with a suitable wire connecting termi
nal such as a nut ‘I. The contact I is the rupture
contact, and ordinarily it is stationary or sub
stantially so. For convenience it will be herein 25
designated as the “stationary” contact. Also
mounted on the housing is a stationary conductor
8 held in place by a screw 9. Connected with the
conductor 8 is a suitable wire connecting terminal
30
such as a nut III.
Movably mounted within the housing I is a con
tact carrying member I I which as illustrated com
prises two insulating plates II“, II“ which are
spaced apart transversely. Although the inven
tion is not necessarily so limited, the contact 35
carrying member II is shown as being pivotally
movable. It is mounted upon a transverse pivot
pin I2 which extends transversely through the
insulating plates II", II“ and into holes in the
side wall of the housing I. Extending trans 40
versely between the plates II“, II‘ is a metallic
bar I3 which carries a movable contact I4 adapted
to engage the stationary contact 4 as shown in ‘
Fig. l.
The contact member I I is biased for movement 45
in the circuit-opening or contact disengaging di
rection, and as shown such biasing is effected by
means of a coil spring I5. This spring is contained
within a telescoping housing I6, one portion of
which is pivotally connected to the contact mem 50
ber and the other portion of which is seated in a
recess in the rear wall of the housing.
An actuator I1 is provided which is connected
with the contact member II so as to be movable
relatively thereto and so as to be also bodily mov
55
2
2,130,368
able therewith. The actuator may be variously
constructed, but it is shown as being of bell-crank
form and as being pivotally connected with the
contact member by means of a transverse pivot
pin l8 which extends through openings in the
side plates Ha, I I“ of the contact member. Bush
ings I9, I 9 serve to hold the actuator H in its nor
mal central position, As hereinafter explained
in detail the actuator is normally held against
10 pivotal movement with respect to the contact
member.
A suitable operating means is provided, this
means preferably comprising two links or mem
bers 20 and 2| pivotally connected with each
15 other at 22. The link or member 20 is formed to
also constitute a handle and it is pivotally
mounted on a transverse pivot pin 23 extending
into suitable holes in the side walls of the hous
ing l. A portion of the handle member 20 pro
20 jects through a suitable opening in the cover 2
so as to be conveniently accessible for manual
operation. The handle member is biased for
movement in the clockwise or circuit-opening
direction by means of a spring 24 surrounding
25 the hub 20“.
The link 2| of the operating means is pivotally
connected at 25 with one arm E1‘1 of the actuator
| 1. With the parts in the position shown in Fig. 1
the two members or links 20 and 2| constitute an
30 overset toggle which holds the contact member in
its contact engaging or circuit-closing position.
Movement of the links 20 and 2| beyond the
position shown in Fig. 1 is prevented by means
of a transverse stop rod 26 extending transversely
35 between the side walls of the housing.
Movably connected with the contact member
latch 29 is rigidly connected at one end with the
60 nected at the said end with the movable con
tact l4. The other end ofthe bi-metallic latch
29 is electrically connected with the aforesaid
stationary conductor 8 by means of a ?exible
conductor 30. Thus with the parts in closed cir
65 cuit position an electrical connection is established
from the terminal 1 through the conductor 5 and
the contacts 4 and i4 and thence through the bi
metallic latch 29 and the ?exible conductor 30
to the stationary conductor 8 and the" terminal Ill.
The herein disclosed construction wherein a
?exible conductor serves as the connection be
tween a stationary conductor and a bodily mov
able bi-metallic latch is not claimed in this appli
‘ cation.
The said construction is disclosed and
claimed in my co-pending application for Auto
and serve to normally hold the operating mem
beer in its closed-circuit position against the bias
in the circuit-opening direction exerted by the
20.
spring 24.
The toggle operating means 29, 2| can be manu
ally released by moving the operating member
20 in the clockwise direction suiliciently to break 25
the toggle. Thereupon the parts move to the
open-circuit position as shown in Fig. 5 under.
the influence of the springs i5 and 24. The
before-mentioned stop rod 26 engages the top
edges of the plates Ha, II{1 to limit movement in
the circuit-opening direction.
As already stated the latch 29 is responsive to
current in the circuit, being preferably connected
electrically to form a part of the circuit. Upon
the attainment of excess current conditions in 35
the in?uence of the spring l5 as soon as the trip
member 21 is released by the latch 29. This will
be more readily apparent when itis observed from
an inspection of Fig. 1 that the pressure nor
mally transmitted through the link 2| tends to
move both the actuator and the trip member in
the clockwise direction, such clockwise move
have shown a latch which consists of a bi-metallic _
transverse bar i3, being thus electrically con
the contact l4 by the contact 4 are transmitted
through the link 2| to the operating member 20
shown in Fig. 4, the contact member will move
As concerns the present invention I do not
narrowly limit myself as to the exact character
50 of the electro-responsive latch but I prefer and
nected to form a part of the circuit and to be
the trip member between the ends thereof and
pivotally connected at 33 with they arm |1b of
the actuator.
With the parts in closed-circuit position, as
shown in Fig. 1, the overset toggle 20, 2| prevents
circuit-opening movement as the result of the
bias of the spring l5. The pressure exerted by
the said spring l5 and the pressure exerted on
automatically to its open-circuit position under
contact member and which releasably engages
the trip member.
directly heated bythe current. As shown the
As shown, the connecting
rearward so that the latch bar 29*3L is disengaged
45 electro-responsive latch which is carried by the
gages with the trip member 21. Preferably, but
55 not necessarily, the latch 29 is electrically con
?xed relationship.
means is a link 3| pivotally connected at 32 with
from the trip member 21. If the operating mem
ber is manually held in closed-circuit position as 40
end they are normally connected by means of an
thermally responsive strip 29. This strip carries
The actuator i1 is suitably connected with the
trip member 21 so that the actuator is held in
?xed relationship with the contact member so
long as the latch 29 holds the trip member in
‘the circuit the bi-metallic latch is heated by
reason of the current therein, and it is de?ected
H is trip member 21. In the construction. as
illustrated the trip member is movable about
the same axis as the contact member itself and
40 is mounted upon the same pivot pin i2. Bush
ings 28, 28 hold the trip member in central posi
tion. Normally the trip member is held in ?xed
relationship with the contact member and to this
a transverse latch bar 29a which normally en
matic circuit breaker Serial No. 152,020, ?led
July 6, 1937.
ment being resisted solely by the latch 29. When
the latch releases the trip member such clock-l
wise movement takes place, and the contact mem
ber moves to its open-circuit position.
If the operating member 20 be released after
the parts have reached the position shown in 55
Fig. 4, the said operating member will be auto
matically moved by the spring 24 to its open
circuit position as shown in Fig. 5 and it will
carry with it the parts 2|, I1, 3| and 21 thus
e?’ecting re-engagement, of the latch with the 60
trip member, assuming that the latch has cooled
su?iciently to permit such re—engagement. It will
be understood that ordinarily the operating mem
ber is not held in its closed-circuit position as
shown in Fig. 4 and that the operating member 65
moves to its open-circuit position practically
simultaneously with the movement of the con
tact member to its open-circuit position. Thus
in normal overload operation the parts move
automatically from the closed-circuit positions 70
shown in Fig. 1 to the open-circuit positions as
shown in Fig. 5 rela'tchingtaking place automati
cally as soon as the bi-metallic latch cools.~
It will be apparent that the provision of an
' actuator separate from the trip member enables
3
2,130,368
the actuator to be conveniently located in the
most advantageous relationship with respect to
the contact member. With a pivoted contact
member as shown in Figs. 1 to 5 the actuator can
be located at a considerable distance from the
pivotal axis, the trip member being located at the
axis when that is found to be desirable. The
major portion of the pressure, stress or force
necessary to move and hold the contact member
10 is transmitted directly from the actuator to the
contact member, the trip member and the latch
being subjected to only a small force which is
merely sufilcient to normally prevent movement of
the actuator with respect to the contact member.
15
As shown the effective length a of the arm i1“
is approximately one-half of the effective length
b of the arm I1", and therefore the force trans
mitted to the link 3| is reduced by about one-half
on account of the ratio between the said effective
20 lengths. The force transmitted to the latch is
still further reduced by reason of the connection
of the link 3| at a point between the ends of the
trip member 21. As shown the distance 0 is about
one-half of the total length d of the trip member,
25 and therefore the force transmitted to the latch
291s reduced to about one-halfof that in the link
31. By reason of this double reduction, the force
at the latch is only about one-fourth of the total
force which is transmitted through the link 21
30 and which is necessary to move and hold the
contact member. The actual ratio between the
force exerted by the link 2| and that applied to
the latch 23 can be readily varied as required, by
changing the ratios between the effective lengths
35 a, b, and c, d.
. While I have shown only two levers having force
reducing ratios, that is the actuator l1 and the
trip member 21, it will be understood that the in
vention is not limited to any speci?c number of
40
45
such levers.
‘
The circuit breaker shown in Figs. 6 to 9 is simi
lar in principle to that shown in Figs. 1 to 5, but
di?ers essentially in that the contact member
moves rectilinearly instead of pivotally. It also
di?ers in that there are two stationary contacts
and two movable contacts thus providing for two
separate breaks in the circuit.
Referring particularly to Figs. 6 to 9, 34 repre
sents as an entirety a casing or housing which is
50 shown as molded from a suitable insulating mate
rial. This housing is closed at the sides and is
substantially closed at the ends and the rear. but
is open at the front where there is provided a
removable insulating cover 35 normally held in
55 place by screws 36, 36.
Two stationary contacts 31 and 38 are mounted
within the housing 34 near the rear thereof, these
contacts being carried by resilient conductors 39
and 40. The conductors 39 and 40 are held in
60 place by means of ?anged metallic tubes or hollow
rivets 4i and 42. These are interiorily threaded
to receive screws 43 and 44 which constitute wire
connecting terminals.
Within the housing 34 is a movable contact
65 carrying member 45 which as illustrated com
prises two insulating plates 45“, 458 which are
spaced apart transversely. The contact member,
instead of being pivotally mounted as shown in
Figs. 1 to 5, is rectilinearly movable toward and
70 away from the rear wall of the housing. The
plates 45“, 458L are rectangular and their end edges
are guided by the end walls of the housing. Ribs
46, 46 formed on the housing also engage the
plates to guide them.
Extending transversely between the insulating
plates 45", 45a is an insulating plate 41. The said
plates 45“, 45a are also connected by two trans
verse metallic bars 48 and 49 which respectively
carry movable contacts 50 and 51 adapted to en
gage the respective stationary contacts 31 and 38
as shown in Fig. 6.
The contact member 45 is biased for movement
in the circuit-opening or contact disengaging di
rection, and as shown such biasing is ‘effected by
means of a coil spring 52. This spring is posi 10
iioned in part within a recess in the rear wall of
the housing and it reacts at the front against the
said insulating transverse plate 41. The spring
52 is preferably enclosed in a tubular member 53
which is in telescopic relationship with the recess 15
in the housing.
An actuator 54 is provided which is connected
with the contact member 45 so as to be movable
relatively thereto and so as to be also bodily mov~
able therewith. The actuator as shown is of hell 20
crank form and it is pivotally connected with the
contact member by means of a transverse pivot
pin 55 which extends through openings in the
side plates of the said member. Bushings 56, 56
serve to hold the actuator 54 in its normal central 26
position.
A suitable operating means is provided, this
means preferably comprising two links or mem
bers 51 and 58 pivotally connected with each
other at 59. The link or member 51 is formed to 30
also constitute a handle and it is pivotally
mounted on a transverse pivot pin 60 extending
into suitable holes in the side walls of the housing.
A portion of the handle member 51 projects
through a suitable opening in the cover 35 so as 35
to be conveniently accessible for manual opera
tion. The handle member is biased for move
ment in the clockwise or circuit-opening direction
by means of a spring 6| surrounding the hub 51'‘.
The link 58 of the operating means is pivotally 40
connected at 62 with one arm 54‘1 of the actuator
54.
With the parts in the position shown in
Fig. 6 the two members or links 51 and 58 con
stitute an overset toggle which holds the contact
member in its contact engaging or circuit-closing 45
position. Movement of the links 51 and 58 be—
yond the position shown in Fig. 6 is prevented by
means of a transverse stop rod 63 extending
transversely between the side walls of the
housing.
50
Movably connected with the contact member 45
is a trip member 64 which is carried by the con
tact member and pivotally connected therewith
by means of a transverse pivot pin 65 extending
between the side plate of the said member. Bush 55
ings 66, 66 hold the trip member in central posi
tion. The trip member is normally held in ?xed
relationship with the contact member by means
of an electro-responsive latch 61 which is prefer
ably similar to the latch 29 already described in 60
connection with Figs. 1 to 5. The bi-metallic
strip or latch 61 is rigidly connected at one end
with the transverse bar 49, being thus electrically
connected at the said end with the movable con
tact 51. The other end. of the bi-metallic latch 65
is electrically connected with the other trans
verse bar 48 and hence with the other movable
contact 50 by means of a flexible conductor 68.
Thus with the parts in closed-circuit position an
electrical connection is established from the ter 70
minal 43 through the conductor 39, contacts 31
and 50, to the ?exible conductor 68 and the latch
61 and thence. through the contacts 5| and 38
and the conductor 40 to the terminal 44.
The actuator 54 is suitably connected with the
4
trip member 6% so that the actuator is held in
?xed relationship with the contact member so
long as the latch 6'? holds the trip member in
?xed relationship. As ' shown, the connecting
means is a link 89 pivotally connected at ‘lit
with the trip member and pivotally connected at
‘it with the arm 5% of the actuator.
With the parts in closed-circuit position as
shown in Fig. 6, the overset toggle 51!, 5d prevents
W circuit-opening movement as a result of the bias
of the spring 52. The pressure exerted by the
said spring 5'2 and the pressure exerted by the
contacts 31 and 38 on the contacts 50 and 5t are
transmitted through the link 58 to the operating
15 member 51 and serve to hold the operating mem
ber in its closed-circuit position against the bias
in the circuit-opening direction exerted by the
spring 6|.
The toggle operating means 51, 58 can be man~
20 ually released by moving the operating member
51 in the clockwise direction su?iciently to break
the toggle. Thereupon the parts move to the
open-circuit position as shown in Fig. 9 under the
influence of the springs 52 and Si. The before
25 mentioned stop rod 63 and another stop rod 1|
engage the top edges of the plates 45“, 458 to limit
movement in the circuit-opening direction.
The automatic opening as the result of overload
is very similar to that already described in con
nection with Figs. 1 to 5 and detailed repetition is
unnecessary. It is su?icient to point out that
upon release of the trip member 64 by the latch 61
the trip member and actuator move in the coun
ter-clockwise direction sumciently to break the
toggle at 51. 58 and at the same time to permit
the contact member to move forward. If the
operating member be held in closed position the
‘parts will assume the relative position shown in
Fig. 8; but if the operating member is not held
the parts will move to the relative positions shown
in F18. 9.
-
As already pointed out in connection with Figs.
1 to 5, the construction makes it possible for the
actuator to be located in the position which is
most advantageous; and with a rectilinearly mov
able contact member it is preferred to have the
actuator at or near the center of the- contact
member as is shown. The trip member can be
located wherever required to accommodate itself
to the position of the latch. The force transmit
ted to the latch can be reduced as desired by
properly determining the relationship of the parts
all as explained in detail in connection with Figs.
1 to 5.
What I claim is:v
_;
_
1. An automatic circuit breaker comprising in
combination, a stationary electric contact, a mov
able contact member biased. in the circuit-open
ing direction and including an electric contact
engageable with the stationary contact, an actu
ator, connected with the contact member for
movement bodily therewith and also for move
ment relative thereto, operating means engaging
ator and to thus permit automatic circuit-open
ing movement of the contact member.
2. An automatic circuit breaker comprising in
combination, a stationary electric contact, a mov
able contact member biased in the circuit-open
ing direction and including an. electric contact
engageable with the stationary contact, an ac
tuator connected with the contact member for
movement bodily therewith and also for pivotal
movement relative thereto, operating means en 10
gaging the actuator to control it, a separate trip
member pivotally movable relatively to the con
tact member, an electro-responsively controlled
latch normally connecting the contact member
and the trip member to maintain them in ?xed 15
relationship, the said latch being adapted upon
the attainment of abnormal current conditions
in the circuit to automatically move so as to re
lease the trip member for independent pivotal
movement, and a link pivotally connected with 20
the actuator and with the trip member and nor
mally serving to hold the actuator in ?xed rela
tionship with the contact member, the said link
serving upon release of the trip member to permit
relative movement of the actuator and to thus
permit automatic circuit-opening movement of
the contact member.
3. An automatic circuit breaker comprising in
combination, a stationary electric contact, a
movable contact member biased in the circuit 30
opening direction and including an electric con
tact engageable with the stationary contact, an
actuator connected with the contact member for
movement bodily therewith and also for move
ment relative thereto, operating means engaging
the actuator to control it, a separate trip mem
ber movable relatively to the contact member, a
bodily movable bi-metallic latch electrically con
nected in the circuit and normally mechanically
connecting the contact member and the trip 40
member to maintain them in ?xed relationship,
the said latch being adapted upon the attain
ment of abnormal current conditions therein to
automatically de?ect from its normal relation
ship so as to disengage the trip member and per~
mit independent movement thereof, and means 45
normally enabling the trip member to hold the
actuator in ?xed relationship with the contact
member and serving upon release of the trip
member to permit relative movement of the
actuator and to thus pemiit automatic circuit 50
opening movement of the contact member.
4. An automatic circuit breaker comprising in
combination, a stationary electric contact, a
movable contact member biased in the circuit
opening direction and including an electric con
55
tact engageable with the stationary contact, an
actuator connected with the contact member for
movement bodily therewith and also for move
ment relative thereto, a separate trip member
movable relatively to the contact member, an 60
electro-responlsively controlled latch normally
connecting the contact member and. the trip
the actuator to control it, a separate trip member . member to maintain them in ?xed relationship,
movable relatively to the contact member, an the said latch serving upon the attainment of
electro-responsively controlled latch normally abnormal current conditions in the circuit to
connecting the contact member and the trip release the trip member for independent move
member to maintain them in ?xed relationship, ment, means normally enabling the trip member
the said latch serving upon the attainment of ab
to hold the actuator in ?xed relationship with ~
70 normal current conditions in the circuit to release the contact member and serving upon release of
the trip member for independent movement, and the trip member to permit relative movement of 70
means normally enabling the trip member to hold the actuator, and toggle links connected with
the actuator in ?xed relationship with the con
the actuator to control it and adapted when in
tact member and serving upon release of the trip overset relationship to normally hold the actu
75 member to permit relative movement of the actu
ator and the vcontact member in their closed 75
5
2,130,368
circuit positions, the said links being normally
rent conditions in the circuit to automatically
held in their said overset relationship by pres
deflect from its normal relationship so as to re
sure transmitted from the contact member and
lease the trip member for independent move
ment, and a mechanical connection between the
being biased for movement to their open-circuit
relationship when such pressure is reduced by
reason of the relative movement of the actuator
upon release of the trip member.
5. An automatic circuit breaker comprising in
combination, a stationary electric contact, a piv
otally movable contact member biased in the cir
cult-opening direction and including an electric
contact engageable with the stationary contact,
an actuator connected with the contact member
for movement bodily therewith and also for piv
15 otal movement relative thereto about an aXis
separated from the pivotal axis of the said mem
ber, operating means engaging the actuator to
move it, a separate trip member movable rela
tively to the contact member, an electro-re
20
sponsively controlled latch normally connecting
the contact member and the trip member to
maintain them in ?xed relationship, the said
latch being adapted upon the attainment of ab
normal current conditions in the circuit to auto
25 matically move so as to release the trip member
for independent movement, and means normally
enabling the trip member to hold the actuator
in ?xed relationship with the contact member
and serving upon release of the trip member to
permit relative pivotal movement of the actu
ator and to thus permit automatic pivotal cir
cuit-opening movement of the contact member.
actuator and the trip member normally serving
to hold the actuator against relative movement
and serving upon release of the trip member to
permit such relative movement and to thus per
mit automatic circuit-opening movement of the
contact member, the said connection being so 10
related to the actuator and the trip member that
the force transmitted from the actuator to the
latch is substantially less than the total force
transmitted from the operating means to the
15
actuator.
8. The combination in an automatic circuit
breaker, of a stationary electric contact, a mov
able contact member biased in the circuit-open
ing direction and including an electric contact
engageable with the stationary contact, a sepa 20
rate trip member movable relatively to the con
tact member, an electro-responsively controlled
latch normally connecting the contact member
and the trip member to maintain them in ?xed
relationship, the said latch serving upon the at 25
tainment of abnormal current conditions in the
circuit to release the trip member for independ
ent movement, an actuator separate from the trip
member and connected with the contact member
for bodily movement therewith and also for
movement relative thereto, toggle links con
nected with the actuator to move it and adapted
to assume an overset position corresponding to
6. The combination in an automatic circuit
breaker, of a stationary electric contact, a mov , the closed-circuit position of the contact mem
ber, and a mechanical connection between the 35
able contact member biased in the circuit-open
ing direction and including an electric contact
engageable with the stationary contact, an actu
ator connected with the contact member for
bodily movement therewith and also for move
ment relative thereto, operating means engaging
40 the actuator to control it, a separate trip mem
ber movable relatively to the contact member,
an electro-responsively controlled latch normally
connecting the contact member and the trip
member to maintain them in ?xed relationship,
45 the said latch serving upon the attainment of
abnormal current conditions in the circuit to
release the trip member for independent move
ment, and a mechanical connection between the
actuator and the trip member normally serving
50 to hold the actuator against relative movement
and serving upon release of the trip member to
permit such relative movement and to thus per
mit automatic circuit-owning movement of the
contact member, the said connection being so
related to the actuator and the trip member that
the force transmitted from the actuator to the
latch is substantially less than the total force
transmitted from the operating means to the
60
actuator.
.
actuator and the trip member normally serving
to hold the actuator against relative movement
and serving upon release of the trip member to
permit such relative movement and to thus per
mit automatic circuit-opening movement of the 40
contact member, the said connection being so
related to the actuator and the trip member
that the force transmitted from the actuator to
the latch is substantially less than the total
force transmitted from the toggle links to the 45
actuator. '
'
9. The combination in an automatic circuit
breaker, of a stationary electric contact, a mov
able contact member biased in the circuit open
ing direction and including an electric contact 50
engageable with the stationary contact, a bell
crank connected with the contact member for
bodily movement therewith and also for pivotal
movement relative thereto, the said bell-crank
having arms of unequal effective lengths, oper 55
ating means engaging the shorter arm of the
bell-crank, a separate trip member movable rela
tively to the contact member, an electro-respon
sively controlled latch normally connecting the
contact member and the trip member to main 60
tain them in ?xed relationship, the said latch
serving upon the attainment of abnormal cur
7. The combination in an automatic circuit
breaker, of a stationary electric contact, a mov
able contact member biased in the circuit open , rent conditions in the circuit to release the trip
ing direction and including an electric contact member for independent movement, and a me
chanical connection between the longer arm of 65
engageable with the stationary contact, an actu
65
the bell-crank and the trip member normally
ator connected with the contact member for
serving to hold the bell-crank against relative
bodily movement therewith and also for move
ment relative thereto, operating means engaging pivotal movement and serving upon release of
the actuator to move it, a separate trip member the trip member to permit such pivotal move
ment and to thus permit automatic circuit 70
70 movable relatively to the contact member, a
bodily movable electro-responsive bi-metallic
latch normally mechanically connecting the con
tact member and the trip member to maintain
them in ?xed relationship, the said latch being
75
adapted upon the attainment of abnormal cur- I
opening movement of the contact member.
10. The combination in an automatic circuit
breaker, of a stationary electric contact, a mov
able contact member biased in the circuit-open
ing direction and including an electric contact
menace
cngageahle with the stationary contact, an elec=
tro-responsively controlled latch bodily movable
with the contact member and also separately
movable upon the attainment of abnormal cur=
rent conditions in the circuit, an operating rnem=
her, and mechanism connecting the operating
member with the contact member for normal
control thereof and having releasable engage=
ment with the latch whereby independent cir»
cult-opening
movement or the contact member
it)
is permitted upon separate movement of the
latch as aforesaid, the said mechanism serving
to effect a double reduction in the force trans
mitted from the operating member to the latch.
11. The combination in an automatic circuit
15
breaker, of a stationary electric contact, a mov
able contact member biased in the circuit-open
ing direction and including an electric contact
engageable with the stationary contact, an actu
20
ator connected with the contact member for
bodily movement therewith and also for move
ment relative thereto, operating means engag
ing theactuator to control it, a separate trip
member movable relatively to the contact mem
ber, an electro-responsively controlled latch nor
mally connecting the contact member and the
trip member to maintain them in ?xed relation
ship, the said latch serving upon the attainment
of abnormal current conditions in the circuit to
release the trip member for independent move
30
ment, and a mechanical connection between the
actuator and the trip member normally serving
to hold the actuator against relative movement
and serving upon release of the trip member to
35
permit such relative movement and to thus per
mit automatic circuit-opening movement 01' the
contact member, the said connection being so
related to the actuator that the force trans
mitted to the connection is substantially less
than that transmitted from the operating means
to the actuator and the said connection being so
related to the trip member that the force trans
mitted to the latch is substantially less than
that transmitted from the actuator to the con
nection.
.
12. In an automatic circuit breaker, the com
bination of a stationary electric contact, a recti
linearly movable contact member biased in the
circuit-opening direction ‘and including an elec
tric contact engageable with the stationary con
tact._ an actuator connected with the contact
member for movement bodily therewith and also
for movement relative thereto, operating means
engaging the actuator to control it, a separate
trip member connected with the contact mem
ber for bodily movement therewith and also for
movement relative thereto, an electro-respon
sively controlled latch normally connecting the
contact member and the trip member to main
tain them in ?xed relationship, the said latch
‘ serving upon the attainment of abnormal current
conditions in the circuit to release the trip mem
bar for independent movement, and means men
chanically connecting the actuator with the trip
member to normally hold the actuator against
relative movement and serving upon release of
the trip member to permit such relative move
ment and to thus permit automatic circuit-open
ing movement oi the contact member.
.
13. In an automatic circuit breaker, the com
bination oi’ two stationary electric contacts
spaced apart, a rectilinearly movable contact
member biased in the circuit-opening direction
and including two electric contacts engageable
with the respective stationary contacts, an actua
tor connected with the contact member for bod
ily movement therewith and also for movement
relative thereto, operating means engaging the
actuator to control it, a separate trip member
connected with the contact member for bodily 16
movement therewith and also for movement rela
tive thereto, a bodily movable bi-metallic latch
electrically connected between the movable con
tacts and normally mechanically connecting the
contact member and the trip member to main 20
tain them in ?xed relationship, the said latch
serving upon the attainment of abnormal current
conditions therein to automatically de?ect so as
to release the trip member for independent move
ment, and means mechanically connecting the ,
actuator with the trip member to normally hold
the actuator against relative movement and
serving upon release of the trip member to per
mit such relative movement and to thus permit
automatic circuit-opening movement of the con- ‘
tact member.
'
14. In an automatic circuit breaker, the com
bination of two stationary electric contacts
spaced apart, a rectilinearly movable contact
member biased in the circuit-opening direction
and including two electric contacts engageable
with the respective stationary contacts, an actua
tor connected with the contact member for move
ment bodily therewith and also for movement
relative thereto, operating means engaging the
actuator to control it, a separate trip member
connected with the contact member for bodily
movement therewith and also for movement rela
tive thereto, a bodily movable bi-metallic latch
electrically connected between the movable con
tacts and normally mechanically connecting the 45
contact member and the trip member to main
tainthem in ?xed relationship, the said latch
serving upon the attainment of abnormal cur
rent conditions therein to automatically de?ect
so as to release the trip member for independ 50
ent movement, and a mechanical connection be
tween the actuator and the trip member normally
serving to hold the actuator against relative
movement and serving upon release of the trip
member to permit such relative movement and 55
to thus permit automatic circuit-opening move
ment or the contact member, the said connection
being so related to. the actuator and the trip
member that the force transmitted from the actu 60
ator to the latch is substantially less than-the
total force transmitted from the operating means
to the actuator.
JOSEPH salons. '
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