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Патент USA US3035148

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May 15, 1962
J. E. SCARPA
3,035,138
MAGNETIC CIRCUIT BREAKERS
Filed Feb. 1, 1961
2 Sheets-Sheet 1
May 15, 1962
J. E. SCARPA
3,035,138
MAGNETIC CIRCUIT BREAKERS
Filed Feb. 1, 1961
2 Sheets~Sheet 2
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3,035,138
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Patented May 15, 10452
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having features of novelty enabling the circuit breaker to
withstand high shock loadings from any direction without
inadvertent tripping thereof.
‘It is another object of the present invention to provide
a magnetic circuit breaker that is relatively small in size,
light in ‘weight, e?icient in operation and relatively inex
pensive in manufacture.
3,035,138
Jerry E. Scat-pa, Anaheim, Calif, assignor to Hughes Air~
MAGNETIC CIRCUIT BREAKER
craft Company, Culver City, Calif, a corporation of
Delaware
Filed Feb. 1, 1961, Ser. No. 86,367
9 Claims. (Cl. 200—106)
A further object of the invention is to provide a mag
The present invention relates generally to circuit breakers
netic circuit breaker including means for withstanding
and relates more particularly to magnetically operated 10 high shock loading and which may be actuated or tripped
circuit breakers having high shock resistant character
in a comparatively short time interval during an electrical
istics. Speci?cally, the magnetically operable electric
overload condition.
circuit breaker of the present invention is intended for
Still another object of the invention is to provide a
use in situations and under conditions where there is a
magnetically operable circuit breaker having a plurality of
possibility or actual existence of high shock loadings 15 latch mechanisms so arranged and constructed to main
applied directly to the circuit breaker or to structure sup
tain electrical contacts in a closed position, even though
the circuit breaker and the latch mechanisms therein are
porting the circuit breaker.
It is required that electric circuit breakers be employed
subjected to high shock loadings from various directions
as safety devices in electric circuits and as a means for
and in excess of 1000 times gravitational force.
A further important object of the invention is to pro
circuits. Such circuit breakers are required to operate
vide a magnetic circuit breaker having features of novelty
when subjected to a 125% to 200% electrical overload
and mechanism to prevent maintenance of electrical con
beyond design and rated values thereof. Magnetically
tacts therein in a closed position when the circuit breaker is
operated circuit breakers are commonly used for this
subjected to an electrical overload.
purpose; however, prior circuit breakers have been unable 25 Other and further important objects of the invention
to withstand shock loadings in excess of approximately
will become apparent from the disclosures in the follow
25 G’s without inadvertent and undesirable tripping there
ing detailed speci?cation, appended claims and accompany
of to interrupt a circuit controlled thereby. This level
ing drawings, wherein:
of shock loading is common and, even though experienced
‘FIGURE 1 is a perspective view of the exterior of the
for only a relatively short time interval, has been sufficient 30 present magnetic circuit breaker;
the protection of electrical devices controlled by such 20
to render prior magnetic circuit breakers impractical for
many installational situations.
In instances where magnetic circuit breakers are sub
jected to forces and shock loadings induced by nearby
high explosives or by other means, shock loadings in ex
cess of 1000 G’s are common.
Shocks of this type may
be arti?cially induced as by, for example, mounting an
object to be tested on a platform and thereafter striking
the platform with a 400-pound hammer accelerated
FIG. 2 is an enlarged exploded isometric view showing
the various component parts of the present circuit breaker
and with the outer case removed;
FIG. 3 is a sectional view through the present circuit
breaker ‘as taken substantially as indicated by line 3--3,
FIG. 1 and with the case removed, the circuit breaker be
ing shown in an unlatched or tripped position;
FIG. 4 is an enlarged fragmentary sectional View show
ing portions of one of the latches and operating means
through an are having a radius of several feet. In prac 40 therefore, the parts being shown in a normal position prior
tice, such loadings are actually produced in the ?ring of
to setting the circuit breaker;
large guns, missile launchings and the like. In indus
FIG. 5 is a fragmentary view similar to FIG. 4 showing
trial applications, operation of drop hammers, certain
types of presses and forging machines, as well as in mobile
earth-moving equipment and the ‘like, such high shock
loadings are also experienced.
Prior magnetic circuit breakers have also included rel
atively complex arm, lever and latch mechanisms that
have been relatively expensive, difficult to calibrate and
align and relatively large in comparison to the rated char
the latch mechanism in a set or latched position;
FIG. 6 is a fragmentary sectional View also similar to
45 FIG. 4 and showing the latch ‘mechanism in a position
during which the circuit breaker is being subjected to an
electrical overload and at a moment just prior to trip
ping thereof; and
FIG. 7 is an enlarged fragmentary sectional view show
ing rotation limiting means for components of the circuit
breaker and taken substantially as indicated by line 7—7,
FIG. 3.
With reference to the drawings, the magnetic circuit
breaker of the present invention is indicated in FIG. 1
acteristics thereof. In some instances, thermal types of
circuit breakers have been employed and a portion of
these have been known to withstand high shock loading.
However, thermal types of circuit breakers are relatively
large and heavy, as well as requiring an excessive time
55 generally at 10. The circuit breaker is housed in a suita
interval, while being subjected to an overload, before
ble rectangular container 11 that may have an open top
they are tripped. Also, thermal circuit breakers require
as at 12, the container serving to surround the mecha
a time interval before they may be reset. In many in
nism of the circuit breaker and being secured to a frame
stances, a tripping time interval of from two to ?ve mil
13 as by suitable screws 14. A pair of terminal studs
liseconds at a 125% to 200% overload is necessary to
satisfy requirements for the protection of expensive equip
60 15 extend from the container 11 and serve as a means for
attachment of the circuit breaker in a circuit to be pro
ment controlled by circuits in which such circuit breakers
tected thereby.
are used. In still further prior circuit breakers, it has
As shown primarily in FIGS. 2 and 3, the terminal
been possible for uninformed or careless operators to
studs 15 are insulated from and extend through the frame
maintain the circuit breaker in a closed condition through 65 13. The terminal studs 15 are further connected by
manipulation or holding of an external handle, button,
means of leads 16 to contact members 17 that are car
knob or reset mechanism. To avoid possible damage of
ried ‘by tubular supports 18 which are, in turn, secured
equipment protected by a circuit breaker, it is therefore
to and depended from a lower portion of the frame 13.
necessary that the construction be such as to prevent any
As shown, the frame 13 has integral X-shaped frame
such adverse use thereof.
members 20 interconnecting an integral upper end por
It is therefore one important object of the present in 70 tion 21 and a lower end portion 22. The members 20
vent-ion to provide a magnetically operable circuit breaker
are depended from common lateral edges of the end por
3,035,138
35
tions 21 and 22, thus to de?ne a cavity for reception of
the balance of the mechanism of the circuit breaker. An
annular boss 23 is disposed from the inner area of the
frame members 2t), there being a supporting shaft 24
positioned coaxial with the boss 23. The ‘boss 23 is fur
ther provided with an annular recess 25, there being a
notch 26 in a wall of the recess 25 for reception of one
riphery of the inner rotor 4-0, the contacts 63 being faced
in a common circumferential direction.
The contacts,
63 are adapted for cooperation with the contacts 17 car
ried by the frame 13. As also shown in FIG. 2, the inner rotor 40 is provided with an arcuate slot 64 that is ins
tended for alignment with the slot 36 in the outer rotor
49. The slots 36 and 64 are adapted for reception of a.
limit pin 65 that is carried by and disposed from one.
of the frame members 20 of the frame 13, this particus
and within the recess 25.
10: lar association- b'eing shown in’ deail in FIG. 7.
As shown in FIGS. 2 and 3,Va formed coil 70 having at
An outer rotor, indicated Igenerally at 349, is adapted
central opening '71 is disposed about the boss 43 of the
for pivotal disposition in the cavity of the frame 13, the
inner rotor 46}, the outer periphery of the coil 70 being;
boss 23 being disposed within a central opening 31 in,
disposed within" the con?nes of the pole pieces 47 and
the outer rotor 34}. The outer rotor 3G is circular and
provided with a peripheral ?ange 32 disposed in one di 15' having a thickness substantially equal to the height of‘
the pole pieces 4-7 from the inner rotor 40. The coil 70.
rection from the rotor. The ?ange 32 has an inner
is shown as being wound from insulated wire; however,v
surface 33, there being a plurality of strike portions 34
the coil may also ‘be wound from anodized aluminum;
having notches 35 and disposed outwardly from the
foil, or the like.- Thev pins 55, depended from the inner‘
?ange 32. The strike portions 34 are shown as being
latch members 53, extend over a lateral surface of the:
four in number and arranged in an equally spaced angu
coil 70. The coil 70 has opposite ends of the leads therelar relationship and laterally diametrically opposite each
from, as indicated at 72 and 73, which are connected‘,
other about the ?ange 32. For a purpose to be here
end of an inner rotor torsional return spring 27. The
spring 27 is adapted for disposition about the shaft 24
inafter more fully described, the outer rotor 30 is fur
ther provided with an arcuate slot 36.
An inner rotor, indicated generally at 40*, is adapted
as shown, to the contact members 66. The windings of?
the coil 70 are therefore in series with the contacts 6131
and-the terminal studs 15.
g
_
As ‘further shown in FIGS. 2 and 3, an X-shaped
for surface engagement with the outer rotor 30 and has
armature 89 is positioned in contact with an outer end
a central bore 41 for reception of and pivotal disposition
surface of the boss 43 and has integral arm portions 81:
about the shaft 214.. A slot 42 in the face of the inner
which extend radially from a central area of the armature:
rotor 40 is adapted for reception of one end of the spring
27. Accordingly, the inner rotor 40 is rotatably biased 30 Sit. The central area of the armature 80 is further provided with an aperture 82 for reception of one end of
in the direction of the arrow 43, relative to the frame 13
the torsion spring 46, thus lightly biasing the armature.v
and within the outer rotor 34) by means of the spring 27.
80 in a direction indicated by the arrow 83. The arma~~
The inner rotor 40 is further provided with a central boss
ture iitl is further provided with pole pieces engaging:
43 in which there is a central recess 44, there being a
notch 45 in a wall of the recess 44. A torsion spring 46 35 members 84 that are depended integrally from outer‘
ends of the arm portions 81 and disposed substantially
is adapted for disposition in the recess 44, one end there
of being disposed in the notch 45.
normal to the arm portions 81.
The members 84 have‘ V
One lateral surface of the inner rotor 40 has a plural
inner edges 85 that are positioned adjacent the outer pe-
ity of magnetic pole pieces 47 disposed outwardly there
riphery of the coil 70, the members ‘84 being adapted?
for cooperation with the faces 5% of the pole pieces 47..
The arm portions 81 further have radially disposed edges
from. The pole pieces 47 are generally L-shaped and
each have a portion 48 that is spaced from and disposed
generally parallel to the surface of the inner rotor 4t},
86 that are adapted for cooperation with the pins 555
depended from the inner latch members 53.
the portions 438 of the pole pieces 47 has a planar end
The armature 80 is provided with a needle bearing:
surface 50 for a purpose to be hereinafter more fully 45 member 37 disposed from the central area thereof, the:
described. The portions 48 of the pole pieces 47 are
member 87 being adapted for disposition in and coopera
further provided with apertures 51 that are adapted ro
tion with a conical recess 38 formed in a central area of.‘
tatably to receive and support a shaft 52 that is depended
a latch receiver 9t} and a boss 91 disposed therefromw
from and connected to an inner latch member 53. The
Thus, the armature 84} is maintained in axial alignment.
member 53 is generally circular and has a ?at surface
with the other structures of the present circuit breaker...
54. A pin 55 is disposed laterally from an edge of the
The latch receiver 94) is generally circular and has ra~
member 53 diametrically opposite the ?at surface 54.
dially extending lugs 92 each with openings 93 there
The shaft 52 extends through the aperture 51 and into
through. The lugs @2 are adapted to overlie ?llet por-'
the area between the portion 43 of the pole pieces 47 and
tions 94 formed integrally in the frame 13, the latch
the surface of the inner rotor 40. The shaft 52 has an 55 receiver being secured to the ?llet portions 94 by means
outer latch arm 56 connected thereto and depended
of suitable screws 95 which threadably engage bores 96
radially outwardly therefrom. A torsion spring ‘57 is
in each of the ?llet portions 94-. The latch receiver 90:
also disposed about the shaft 52 and between the arm 56
has a peripheral ?ange 97 which extends toward the
and the pole pieces 47, there being suitable notches in
frame 13 and has inner and outer diameters substantially‘
these elements for reception of ends of the torsion spring 60 equal to the respective inner and outer diameters of the
57. The spring 57 serves rotatably to bias the outer
?ange 32 of the outer rotor 31!}; An inner surface of'
latch arm and the inner latch member in the direction
the ?ange 97 is provided with a plurality of semicircular
of the arrows 58. While only a single latch structure,
recesses 98 that are, as will be hereinafter more fully‘
including the inner latch member 53 and outer latch
described, adapted for cooperation with the inner latch.
member 56, have been described, it is to be understood 65 members 53.
that, as shown, there are four of these structures and
With reference to FIGS. 1, 2 and 3, the present circuit
that the construction thereof is identical.
breaker is provided with an external toggle lever 100
The inner rotor at} is further provided with a pair
which extends through a boss 161 and into the cavity de~
of L-shaped contactmembers at} that are secured in angu
?ned within the frame 13. The toggle lever 1th} is
lar spaced relationship to the surface of the inner rotor 70 pivoted on a pin M32 disposed laterally through the boss
as by suitable screws 61, there being an insulating mem
Lttltl. The inner end of the toggle lever 100 is generally
ber 62 positioned between the contact members 64} and
L-shaped whereby to dispose an arm portion 103 thereof
the surface of the inner rotor (it). The contact mem
adjacent a side of the outer rotor 3h remote from the
bers 60 carry contacts 63 that are carried by portions of
strike portions 34. A free end of the arm 103 is bifur
the contact members extending radially from the pe 75 cated as at The and adapted for cooperation with a pin
whereby to de?ne an open area therebetween.
Each of
3,035,138
5
5
105 depended from the outer rotor 30. Accordingly,
as the toggle lever 100 is moved in the directions of the
arrow 106, the outer rotor 30 will also be moved in
3t} and inner rotor 4i} respectfully cooperate with the
the directions of the arrow 107.
limit pin 65 carried by the frame 13 to limit angular
movement of the inner and outer rotors about the sup
porting shaft 24.
Having thus described the invention and the present
Operation of the present circuit breaker is illustrated
primarily in FIGS. 4, 5 and 6 and in conjunction with
FIGS. 2 and 3. In FIG. 4, the mechanism of the circuit
embodiment thereof, it is desired to emphasize the fact
breaker is shown as being in condition to be cocked or
set. It is to be noted that the ?at surface 54 of the inner
claims.
latch member 53 is substantially parallel to the inner 10
surface 33 of the ?ange 32 of the outer rotor 30 and that
the outer latch arm 56 is slightly engaged in the outer
end of the notch 35 in the strike portion 34, also carried
by the outer rotor 30. Upon operation of the toggle
lever 10%), the outer rotor 30 will be rotated in the direc
tion of the arrow 110, FIG. 4, whereby to move the
inner rotor 46, storing torsional force in the spring 27.
As shown, the inner latch member 53 is biased in the
direction of the arrow 58 by the torsion spring 57 and,
when the inner rotor 40 reaches the position shown in
FIG. 5, the inner latch member 53 will rotate as shoWn
into the recess 98.
Also, the outer latch arm 56 will move
to the base of the notch 35 in the strike portion 34.
When the components are in the position shown in FIG.
5, the contacts ‘63 will be in engagement with the contact
17, whereby to complete a circuit from one of the ter
minal studs 15, through one lead 16, one set of contacts
17-63, through the coil '70, the other set of contacts
l7—63, the other lead 16 and the other terminal stud 15.
that many modi?cations may be resorted to in a manner
limited only by a just interpretation of the following
I claim:
1. A magnetic circuit breaker comprising: a frame
structure; electrical terminals carried by and insulated
from said frame structure; ?rst electrical contacts con
nected to said terminals; a latch receiver carried by said
frame structure in spaced relationship thereto; an outer
rotor; an inner rotor, said outer and inner rotors being
disposed intermediate said frame structure and said latch
receiver; strike means carried by said outer rotor; latch
means carried by said inner rotor and cooperable with
said strike means; latch receiving means in said latch
receiver, said latch means also being cooperable there
with; second electrical contacts carried by said inner ro
tor and adapted for engagement with said ?rst contacts;
means disposed ‘between said frame structure and said
inner rotor for biasing said second contacts in a direction
away from said ?rst contacts; a coil disposed adjacent
said inner rotor, said coil being connected in series with
said terminals through said ?rst and second contacts; mag
netic pole pieces carried by said inner rotor and dis
Thus the circuit is complete through the circuit breaker. 30 posed about said coil; a rotatable armature positioned
adjacent said latch receiver and cooperable with said pole
When an electrical overload condition is experienced,
pieces to move said armature in response to an increased
an increased ?ux density will be manifest in the coil 7%
flux density in said coil beyond a rated value thereof, a
and magnetically cause the armature 80 to be rotated
portion of said armature ‘being cooperable with said
to the position shown by the solid lines in FIG. 6 and
latch means upon said movement thereof; and means for
the pole piece engaging portions $4 to engage the face
moving said outer rotor whereby to rotate said inner
So of the pole piece 47. Also, at this time, torsional
rotor through said strike and latch means, engage said
force is stored in the torsion spring 46 and the edge 86
latch means with said latch receiving means and engage
of the armature arm portions 81 will engage the pin 55
said ?rst and second contacts, said increased ?ux density
thereby to rotate the inner latch member 53, shaft 52,
serving to move said armature, disengage said latch means
and outer latch arm 56 in a direction to remove the
outer latch arm 56 from the notch 35 in the strike 34 and
further to rotate the inner latch member 53 out of en
gagement with the recess 98. With the latching action
against rotation of the inner rotor 4% being removed,
the force stored in the torsion spring 27 will rotate the
inner rotor 40 in the direction of the arrow 111, FIG.
6, to dispose the components in the positions shown by
from said latch receiving means and said strike means,
thereafter to permit separation of said contacts by action
of said biasing means.
2. A magnetic circuit breaker comprising: a frame
structure; electrical terminals carried by and insulated
from said frame structure; ?rst electrical contacts con
nected to said terminals; a latch receiver carried by said
frame structure in spaced relationship thereto; an outer
rotor; an inner rotor, said outer and inner rotors being
disposed intermediate said frame structure and said latch
the dotted lines in FIG. 6. At this time, the contacts
63 will be separated from the contacts 17 whereby to
open the circuit across the terminal studs 15.
50 receiver; strike means carried by said outer rotor; latch
As long as an electrical overload condition exists, the
means carried by said inner rotor and cooperable with
toggle lever 1% may be moved in the directions of the
said strike means; latch receiving means in said latch
arrow 1%, to rotate the outer rotor 38. However, the
receiver, said latch means also being cooperable there
latch components will remain in the position shown by
the solid lines in FIG. 6, thus to prevent resetting of the
with, said strike, latch and latch receiving means being
circuit breaker under such conditions.
While the operation of the present circuit breaker has
been described in association with a single set of latching
components, it is to be understood that all of the indi
vidual latches disposed about the periphery of-the inner
rotor 40 operate identically and simultaneously. Loca~
tion of the four latches is such that while high shock
loadings in any one direction may have the effect of un
latching one or two of the latches, the balance of the
contacts carried by said inner rotor and adapted for
engagement with said ?rst contacts; means disposed be
latches serve to maintain the circuit breaker in a cocked
or set position with the loading forces acting to increase
the holding force of these latches. Further, the use of
the rotary sliding construction between the inner latch
members 53 and the notches 98 of the ?ange 97 of the
arranged in diametrically opposed pairs; second electrical
tween said frame structure and said inner rotor ‘for bias
ing said second contacts in a‘direction away from said
?rst contacts; a coil disposed adjacent said inner rotor,
said coil being connected in series with said terminals
through said ?rst and second contacts; magnetic pole
pieces carried by said inner rotor and disposed about said
coil; a rotatable armature positioned adjacent said latch
receiver and cooperable with said pole pieces to move
said armature in response to an increased flux density in
said coil beyond a rated value thereof, a portion of said
armature being cooperable with said latch means upon
said movement thereof; and means for moving said outer
latch receiver ht), high holding force against rotation of 70 rotor whereby to rotate said inner rotor through said
the latches out of the notches is maintained while very
strike and latch means, engage said latch means with
little force is required on the pins 55, as exerted by the
said latch receiving means and engage said ?rst and sec
armature S0, to rotate the inner latch members 53 out of
ond contacts, said increased flux density serving to move
engagement with the notches 98. As described herein
said armature, disengage said latch means from said latch
before, the arcuate slots 36 and 64 in the outer rotor
receiving means and said strike means, thereafter to per
3,035,138
7
mit separation of said contacts by action of said bias
ing means.
3. A magnetic circuit breaker comprising, in combina
tion: a frame structure; electrical terminals carried by
and insulated from said frame structure; stationary elec
5. A magnetic circuit breaker comprising, in combina
tion: a frame structure; electrical terminals carried by
and insulated from said frame structure; stationary elec
trical contacts connected to said terminals; a latch receiv
er carried by said frame structure in spaced relationship
trical contacts connected to said terminals; a latch re
thereto; an outer rotor; an inner rotor, said outer and
ceiver carried by said frame structure in spaced rela—
tionship thereto; an outer rotor; an inner, rotor, said outer
inner rotors being rotatably disposed intermediate said
frame structure and said latch receiver; plural strike
means carried by said outer rotor; plural latch means
carried by said inner rotor and cooperable with said strike
and inner rotors being rotatably disposed intermediate
said frame structure and said latch receiver; plural strike
means carried by said outer rotor; plural latch means
carried by said inner rotor and cooperable with said
strike means; latch receiving means in said latch receiver,
said latch means also being cooperable therewith, said
strike, latch and latch receiving means 'being arranged in 15
means, said latch means having a circular latch member;
semicircular latch receiving recesses in said latch receiver,
said latch means also being cooperable therewith, said
strike and latch means and said latch receiving recesses
being arranged in lateral diametrically opposed pairs;
lateral diametrically opposed pairs; movable electrical
movable contacts carried by said inner rotor and adapted‘
contacts ‘carried by said inner rotor and adapted for en
gagement with said stationary contacts; means disposed
‘between said frame structure and said inner rotor for
biasing said movable contacts in a direction away from 20
means disposed between said frame structure and saidv
'inner rotor for biasing said movable contacts in a direc-
for engagement with said stationary contacts; spring
tion away from said stationary contacts; a coil disposed
said stationary contacts; a coil disposed adjacent said
adjacent said inner rotor, said coil being connected in
inner rotor, said coil being connected in series with said
series with said terminals through said movable and sta
terminals through said movable and stationary contacts;
tionary contacts; magnetic pole pieces carried by said
magnetic pole pieces carried by said inner rotor and dis
inner rotor and disposed about said coil; a rotatable.
posed about said coil; a rotatable armature positioned 25 armature positioned adjacent said latch receiver and coadjacent said latch receiver and cooperable ‘with said
operable with said pole pieces to move said armature in
pole pieces to move said armature in response to an
response to an increased ?ux density in said coil beyond a
rated value thereof, a portion of said armature being oper
able to engage and rotate said latch means and said cir—
with said latch means upon said movement thereof; 30 cular latch member upon said movement thereof; manual
increased ?ux density in said coil beyond a rated value
thereof, a portion of said armature being cooperable
manually operable means for pivotally moving said outer
ly operable means for pivotally moving said outer rotor
rotor whereby to rotate said inner rotor through said
strike and latch means, engage said latch means With
said latch receiving means and engage said movable and
whereby to rotate said inner rotor through said strike and
latch means, engage said latch means with said semicir
cular latch receiving recesses and engage said movable
stationary contacts, said increased ?ux density serving to 35 and stationary contacts, said increased flux density serv
move said armature, disengage said latch means from
ing to move said armature, disengage said latch means
said latch receiving means and said strike means, there
from said latch receiving recesses and said strike means,
after to permit separation of said contacts by action of
thereafter to permit separation of said contacts by action
said biasing means; and means for limiting angular rota
of said biasing means; ‘and means for limiting angular
tion of said rotors.
40 rotation of said rotors.
4. A magnetic circuit breaker comprising, in combina
6. In a magnetic circuit breaker having electrical termi
tion: a frame structure; electrical terminals carried by
nals, contacts movable into and out of engagement, a
and insulated from said frame structure; stationary elec
movable rotor for supporting movable elements of said
trical contacts connected to said terminals; a latch re
contacts, a coil, a frame and means biasing said contacts
ceiver carried by said frame structure in spaced relation
toward an open position, the combination with said cir
ship thereto; an outer rotor; an inner rotor, said outer and 45 cuit breaker of a latch arrangement between said frame
inner rotors being rotatably disposed intermediate said
and said rotor, said latch arrangement comprising: a
frame structure and said latch receiver; plural strike
plurality of latches carried by said rotor, said latches be
means carried by said outer rotor; plural latch means
ing disposed in lateral opposed relationship; latch receiv
carried by said inner rotor and cooperable with said
ing recesses in a portion of said frame, portions of said
strike means, said latch means having a circular latch 50 latches being pivotally engageable with said recesses; and
member; semicircular latch receiving means in said latch
means operable upon an increased ?ux density in said
receiver, said latch means also being cooperable there
coil to rotate said latch portions out of engagement with
with; movable contacts carried by said inner rotor and
said recesses, said biasing means thereafter serving to
adapted for engagement with said stationary contacts;
move said rotor to separate said contacts.
means disposed between said frame structure and said 55
7. In a magnetic circuit breaker having electrical termi
inner rotor for biasing said movable contacts in a direc—
nals, contacts movable into and out of engagement, a
tion away from said stationary contacts; a coil disposed
movable rotor for supporting movable elements of said
adjacent said inner rotor, said coil being connected in
contacts, a coil, a frame and means biasing said contacts
series with said terminals through said movable and sta
toward an open position, the combination with said cir
tionary contacts; magnetic pole pieces carried by said 60 cuit breaker of a latch arrangement between said frame
inner rotor and disposed about said coil; a rotatable arma
and said rotor, said latch arrangement comprising: a
ture positioned adjacent said latch receiver and cooperable
plurality of latches carried by said rotor, said latches be
with said pole pieces to move said armature in response
ing disposed in lateral opposed relationships; latch receiv
to an increased flux density in said coil beyond a rated
ing recesses in a portion of said frame, portions of said
value thereof, a portion of said armature being operable 65 latches being pivotally engageable with said recesses;
to rotate said latch means and said circular latch mem
means operable upon an increased flux density in said coil
ber upon said movement thereof; and manually operable
to rotate said latch portions out of engagement with said
means for pivotally moving said outer rotor whereby to
recesses, said biasing means thereafter serving to move
rotate said inner rotor through said strike and latch
said rotor to separate said contacts; and means externally
means, engage said latch means with said latch receiving 70 of said frame and operable through said latches to re
means and engage said movable and stationary contacts,
engage said contacts only when said ?ux density is reduced
said increased ?ux density serving to move said armature,
below a predetermined level.
disengage said latch means from said latch receiving
8; In a magnetic circuit breaker having electrical ter
means and said strike means, thereafter to permit separa
minals, contacts movable into and out of engagement, a
tion of said contacts by action of said biasing means.
movable rotor for supporting movable elements of said
3,035,138
9
10
.
contacts, a coil, 21 frame and means biasing said contacts
rality of latches carried by said rotor and disposed pe
ripherally about said coil, said latches having semicircular
portions and being disposed in lateral opposed relation
toward an open position, the combination with said cir
cuit breaker of a latch arrangement between said frame
and said rotor, said latch arrangement comprising: a plu
ship; semicircular latch receiving recesses in a portion of
rality of latches carried ‘by said rotor, said latches having 5 said frame peripherally disposed about said latches, said
semicircular portions and being disposed in lateral opposed
semicircular portions of said latches being pivotally en
relationship; semicircular latch receiving recesses in a
gageable with said recesses; armature means operable upon
portion of said frame, said semicircular portions of said
an increased ?ux density in said coil to engage and to ro
latches being pivotally engageable with said recesses; and
tate said latch portions out of engagement with said
armature means operable upon an increased ?ux density 10 recesses, said biasing means thereafter serving to move
in said coil to engage and to rotate said latch portions out
said rotor to separate said contacts; and means externally
of engagement with said recesses, said biasing means there
of said frame and operable through said latches to re
after serving to move said rotor to separate said con
7 engage said contacts only when said ?ux density is re
tacts.
duced below a predetermined level.
9. In a magnetic circuit breaker having electrical ter
minals, contacts movable into and out of engagement,
References Cited in the file of this patent
a movable rotor for supporting movable elements of said
UNITED STATES PATENTS
contacts, a coil, a frame and means biasing said contacts
1,576,276
Hedges et al ___________ __ Mar. 9, 1926
toward an open position, the combination with said cir
2,603,729
Ball ________________ __ July 15, 1952
cuit breaker of a latch arrangement between said frame 2
and said rotor, said latch arrangement comprising: a plu
2,705,272
Dobes et al ____________ __ Mar. 29, 1955
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