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Патент USA US2105604

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Jan. 18,1938.
w. LEYHAUSEN
ELECTROMAGNETIC OVEHLOAD CIRCUIT BREAKER
Filed Dec. 1, 1933
‘2,105,604
2,105,604
Patented Jan. 18, 1938
UNITED STATES PATENT OFFICE
2,105,604
ELECTROMAGNETIC OVERLOAD CIRCUIT
BREAKER
Wilhelm Leyhausen, Nuremberg, Germany
Application December 1, 1933, Serial No. 700,579 -
In Germany October 18, 1933
10 Claims. (Cl. 200-89)
This invention relates to an electro-magnetic
overload circuit breaker in which the circuit is
broken between the end faces of two magnetic
coils, the spark gap being formed by ?re-proof
5 partitions which separate the contacts from the
coils and protect against ?ashing over of the
breaking spark. Co'nstructions'oi such circuit
breakers are already known in-which the release
is effected by an armature which is attracted
by the two separate magnet coils. The attract
ing force of the magnet coils is at the same
time extremely weak, so that the release can
only be caused‘at a multiple of the nominal cur
rent strength.
15
This objection is overcome by the invention in
that, at least one of the magnet coils has a
plunger which communicates with the releasing
device on the side remote from the magnet coils.
Thus, not only a better moment of attraction‘
20 of the magnet coils and a more rapid operation
is obtained, but it also'enables the blowing effect
of the coil to be increased in that the coil is
provided with a rigid magnetic connection, a
‘yoke or frame, for employing which a separate
switching magnet was hitherto required, whereby
the device was rendered complicated and ex- -
pensive.
Two embodiments of the invention are illus
trated by way of example in the accompanying
3 6 drawing in which:—
Fig. 1 shows the circuit breaker partly in side
elevation and partly in section.
Fig. 2 is a similar view of a modi?ed form of
construction.
Fig. 3 is a diagrammatic View of a switching
mechanism necessary for the circuit breakers
illustrated in Figs. 1 and 2.
4
In Fig. 1 contacts a and b are arranged be
tween magnet coils c and (Z, the outer poles of
which are magnetically connected to an iron
strap 2. The contacts are separated from the
magnet coils by ?reproof partitions e’ and d’.
moved into the cutting out position. The are
forming between the contacts is extinguished by
the magnet coils. By ?tting a spring counter
acting the force of attraction of the coil 11 on
the plunger f the strength of the switching out El
current can be regulated in known manner.
In Fig. 2 the iron strap e is extended to form
an iron frame 1', which serves at the same time
for ?xing the system on a base s. Contrary
to the form of construction shown in Fig. 1 the
bell crank lever g’ in Fig. 2 is made of iron and
one of its arms, to whicn the plunger 1‘ is ?xed,
0
forms a part of the frame 1‘. In other respects
the operation is the same as'that of the form
of construction shown in Fig. 1. The frame 1' 15
may be entirely closed and the bell-crank lever
g’ and plunger 1‘ constructed as illustrated in
Fig. 1.
'
The peculiar arrangement of the coils, con
tacts and magnetic release requires a special 20
switching mechanism. An advantageous form of
construction is shown in Fig. 3 on a switch with‘
two contacts.
The contacts a and b are resiliently mounted
on the base s and a contact bridge u is arranged 25
opposite the contacts on a switch bar t.
A toggle lever system consists of a bell crank
lever is, p of a-lever l pivotally mounted on a
rigid pin n, of two links it, i forming a toggle >
lever and pivotally connected with each other
by a pivot pin 0, the lever arm 72. connected with
the arm k of the bell crank lever by a pivot
pin m’ and the lever i with the lever l by a pivot
pin 1i’. The arm 1) of‘ the bell crank lever is
pivoted on a pivot pin n’ ?xed on the switch
bar t the lever being pivotally mounted on the
pivot pin 0. The arm p of the bell crank lever
is in?uenced by a spring q and pressed against
an abutment w.
m
If a switch lever a is swung in clockwise direc 40
tion, a pin a: eccentrically mounted on the switch
lever 2 acts on the lever -Z and brings the lever
system into the switching in position shown in
The coil 0 has a ?xed magnet core whereas the
dotted lines.
I
45 coil d is provided with a plunger 1‘. This latter ‘
During this movement the pivot pin 0 of the
is connected to a bell-crank lever g the free
toggle lever h, 1‘ moves in a straight line and
end of which can- act upon the switching mecha
nism h. The connection between the switching
-mechanism and ‘the contacts has been omitted
50 from the drawing for the sake of clearness. In
the switching in position the contacts a and b
touch one another.
If the current exceeds a
certain strength, the plunger f is attracted caus
ing the bell crank lever g to strike against the
55 switching mechanisms whereby the switch is
always at the same distance from the bell crank
lever g e?ecting the release, so that it always
strikes against the lever h in the- same position
and with the same force in the event of short- '
ing or ‘overload. The device therefore forms a
free release with an ideal manner of operation,
no matter whether the releasing lever is electro
magnetically or thermally controlled.
In
the
,
2
2,105,604
present instance the device is of particular im
portance because the movement of the releasing
lever can be limited to the smallest size so that
the switching speed is increased and the magnet
parts can be placed in the most favorable posi
tion from the outset.
'
breaker, magnet coils, contacts between the'end
faces of said coils, a release mechanism consist
ing of a toggle, an electro-magnetically controlled
bell crank for breaking said toggle, one arm of
said bell crank lever being connected to be actu
ated by energization of one of said magnets, a piv
In order to attain the rectilineal movement of
the pivot pin 0, the levers k and Z are of the same
length and also the two links it and i of the tog
said bell crank, said pivoted arm and said other
arm of said bell crank being connected together
the pivot pin m’ must therefore approach and
by means of said toggle, whereby the joint of 10
the toggle is uniformly distant from the electro
10 gle lever. During the switching in movement
move away from the engaging surface of the
releasing lever g in the same proportion as the
oted arm equal in length to the other arm of
pivot pin 12' moves away ‘from and approaches
magnetically controlled bell crank lever in all
positions of the toggle while its arms are in aline
ment.
3. In an overload circuit breaker, a pair of ax
constructed so that the pivot pin 0, during the
ially alined and spaced magnet windings, circuit
contacts between the adjacent ends of the wind
15 the same. Thus, by differently dimensioning and
mounting the levers k and l, the device can be
switching in operation changes its distance from
the releasing lever g to a predetermined extent,
being desirable in certain instances.
The bell crank lever is, p is also of particular
importance for‘the device. By suitably shaping
and arranging the same the horizontal move
ment of the toggle lever h, i can impart a vertical
26 movement to the switch bar i, so that the switch
may be of compact construction and space and
material is saved.
The automatic breaking of the circuit is effect
ed as follows. The device is shown in circuit
80 closing position by dotted lines in Fig. 3. If a
short-circuit or an overload occurs, the lever o
presses against the pivot pin 0. The toggle lever
h, iis thereby bent, and the bell crank lever is, p,
swings under the pressure of spring q, thereby
35 lifting the switch bar t and causing contact bridge
u to lift from contacts aand b and break the
. circuit.
At the same moment the coil of is clean
ergized so that the lever 9 may return to its posi
tion of rest. The toggle lever h, i may hence
return to its alined position under the force of
its own weight, so that the position of the indi
vidual parts is now that shown in Fig. 3 in
straight lines, that is, in open circuit position.
This is permitted because the resetting lever z
45 is normally in position shown by full lines and
the arm b can thus freely swing to the right and
offers no substantial resistance to the dropping
of the pivot. pin 0. With the parts in the full
line position, it is merely necessary to move the
-50 resetting lever z to the dotted line position where
upon the toggle will push the lever arm k to
the left and cause the lever arm 9 to swing
downwardly to depress the bar t and bridging con
tact u so that the latter again bridges the con
tacts a and b'. The resetting lever 21 may now be
swung to full line position, thus leaving all parts
ready for the next operation.
Both coils instead of only one may be provided
with plungers if a stronger force is necessary for
the releasing. The magnet core of the coils may
likewise be divided and one part thereof be fixed
whereas the other part forms the plunger.
1. In any electro-magnetic overload circuit
' breaker, magnet coils, contacts between the end
faces of the ‘coils, a plunger in one of the magnet
coils, a releasing mechanism for opening the
contacts, a transfer means between the plunger,
and the release mechanism, said transfer means
including a toggle, a pivoted arm linked to one
end of the toggle, a bell crank lever connected to
the other end of the toggle, and a switch bar fas
tened to the free end of the said bell crank lever
and displaceable crosswise of the axis of the coils.
2. In
an
electro-magnetic overload
circuit -
ings, one of said contacts being fixed and a second
of said contacts being movable transversely of
the ?eld between said windings, a frame mag 20
netically connecting the remote ends of said
windings, a lever having one end pivoted to the
frame and projecting upwardly therefrom, a bell
crank lgver pivoted at its angle to said frame and
having a depending arm, a pair of pivotally
jointed links constituting a toggle, said toggle
having its ends connected respectively to the
?rst lever and the depending arms of the bell
crank lever, a lift rod pivoted to the remaining
arm of the bell crank lever and carrying the mov- '
able contact, a spring'urging said bell crank lever
to move the lift rod to open circuit position, and
means actuated by energization of said windings
to engage and flex the toggle at its joint.
4. In an overload circuit breaker, a pair of
axially alined and spaced magnet windings, cir
cuit contacts between the adjacent ends of the
windings, one of said contacts being ?xedtand a
second of said contacts being movable trans
versely of the field between said windings, a ~10
frame magnetically connecting the remote ends
of said windings, a lever having one end pivoted
to the frame and projecting upwardly therefrom,
a bell crank lever pivoted at its angle to said
frame and having a depending arm, a pair of
pivotally jointed links constituting a toggle, said
toggle having its ends connected respectively to
the first lever and the depending arms of the bell
crank lever, a lift rod pivoted to the remaining
arm of the bell crank lever‘and carrying the mov
able contact, a spring urging said bell crank lever
to move the lift rod to open circuit position, a
second bell crank lever pivoted to said frame and
having one arm below the joint of the toggle and
its other arm depending across the remote end ‘
of one of said windings, and a magnetic core in
the last mentioned winding and connected to
the depending arm of the second bell crank lever.
5. In an overload circuit breaker, a pair of
axially alined and spaced magnet windings, cir 60
cuit contacts between the adjacent ends of the
windings, one of said contacts being fixed and
a second of said contacts being movable trans
versely of the ?eld between said windings‘, a
frame magnetically connecting the remote ends
of said windings, a lever having one end pivoted
to the frame and projecting upwardly therefrom,
a bell crank lever pivoted at its angle to said
frame and having a depending arm, a pair of
pivotally jointed links constituting a toggle, said
toggle having its ends connected respectively to
the first lever and the depending arms of the bell
crank lever, a lift rod pivoted to the remaining
arm of the bell crank lever and carrying the
movable contact, a spring urging said bell crank 75
2,105,804 ,
3
connected being also of equal length.
the ?rst lever and the depending arms of the
bell crank lever, a lift rod pivoted to the remain
ing arm of the bell crank lever and carrying the
movable contact, a spring urging said bell crank
lever to move the lift rod to open circuit posi
tion, a second bell crank lever pivoted to said
axially alined and spaced magnet windings, cir
toggle and its other arm depending across the
lever to move the lift rod to open circuit posi
tion, and means actuated‘by energization of said
windings to engage and ?ex the toggle .at its
joint, said links being of equal length and the
Cl lever arms to which the ends of the toggle is
6. In an overload circuit breaker, a pair of ' frame and having one arm below the joint of the
cuit contacts between the adjacent ends of the
10 windings, one of said contacts being ?xed and
a second of said contacts'being movable trans
versely of the ?eld between said windings, a
frame magnetically connecting the remote ends
of said windings, a lever having one end'pivoted
to the frame and projecting upwardly therefrom,
a bell crank lever pivoted at its angle to said
frame and having a depending arm, a pair of
plvotally jointed links constituting a toggle, said
toggle having its ends connected respectively to
20 the ?rst lever and the depending arms of the
bell crank lever, a lift rod pivoted to the re
maining arm of the bell crank lever and carry
ing the movable contact, a spring urging said
bell crank lever to move the lift rod to open
remote end of one of said windings, a magnetic
core in the last mentioned winding and con 10
nected to the depending arm of the second ,bell
crank lever, and a resetting lever pivoted to the
frame and provided with a pin for engaging the
?rst lever to move the same to circuit closing
15
position.
'
9. In an overload circuit breaker, a pair of
'
axially alined and spaced magnet windings, cir
cuit contacts between the adjacent ends of the
windings, one of said contacts being ?xed and
‘a second of said contacts being movable trans 20
versely of the ?eld between said windings, a
frame magnetically connecting the remote ends
of said windings, a lever having one end pivoted
to the frame and projecting upwardly therefrom,
25 circuit position, a second bell crank lever pivoted
a bell crank lever pivoted at its angle to said
of the toggle and its other arm depending across
the remote end of one of said windings, and a
otally jointed links constituting a toggle,vsaid tog
gle having its ends connected respectively to the
to said frame and having one arm below the joint ‘ frame and having a depending arm, a pair of piv
magnetic core in the last mentioned winding and
30 connected to the depending arm of the second
bell crank lever, said links being of equal length
and the lever arms to which the ends of the tog
gle is connected being also of equal length.
'7. In an overload circuit breaker, a pair of
axially alined and spaced magnet windings, cir
cuit contacts between the adjacent ends of the
windings, one, of said. contacts being ?xed and a
second of said contacts being movable trans
versely of the ?eld between said windings, a
40 frame magnetically connecting the remote ends
of said windings, a lever having one end pivoted
to the frame and projecting upwardly therefrom,
a bell crank lever pivoted at its angle to said
frame and having a depending arm, a pair of
45 pivotally jointed links constituting a toggle, said
toggle having its ends connected respectively to
the ?rst lever and the depending arms of the bell
crank lever, a lift rod pivoted to the remaining
arm of the bell crank lever, and carrying the
.50 movable contact, a spring urging sail bell crank
lever to move the lift rod to open circuit position,
means actuated by energization of said windings
to engage and ?ex the toggle at its joint, and a
resetting lever pivoted to the frame and provided
with a pin for engaging, the ?rst lever to move
the same to circuit closing position.
8. In an overload circuit breaker, a pair of
axially alined and spaced magnet windings,~ cir
cuit contacts between the adjacent ends of the
60 windings, one of. said contacts being ?xed and
a second of said contacts being movable trans—
versely of the ?eld between said windings, a
?rst lever and the depending arms of the bell
crank lever, a lift rod pivoted to the remaining
arm of the bell crank lever and carrying the
movable contact, a spring urging said bell crank
lever to move the lift rod- to open circuit position,
means actuated by energization of said windings
to engage and ?ex the toggle at its joint, said 35
links being of equal length and the lever arms
to which the ends of the toggle are connected be
ing also of equal length, and a resetting lever piv
oted to the frame and provided with a pin for
engaging the ?rst lever to move the same to cir
40
cuit closing position.
10. In an overload circuit breaker, a pair of
ax‘ally alined and spaced magnet windings, cir
cuit contacts between the adjacent ends of the
windings, one of said contacts being ?xed and
a second of said contacts being movable trans
versely of the ?eld between said windings, a frame
magnetically connecting the remote ends of said
windings, a lever having one end pivoted to the
frame and projecting upwardly therefrom, a bell 50
crank lever pivoted at its angle'to said frame
and having a depending arm, a pair of pivotally
jointed links constituting a toggle, said toggle
having its ends connected respectively to the ?rst .
lever and the depending arms of the bell crank 55
lever, a lift rodipivoted to the remaining arm
of the bell crank lever and carrying the movable
contact, a spring urging said bell crank lever to
move the lift rod to opencircuit position, a sec
ond bell crank lever pivoted to said frame and
having one arm below the joint of the toggle and
its other arm depend‘ng' across, the remote end
frame magnetically connecting the-remote ends _of one of said windings, a magnetic core in the
last mentioned winding and connected to the de
of said windings, a lever having one end piv
pending arm of the second bell crank lever, and 65
oted to the frame and projectingupwardly there
from, a bell crank pivoted at its angle to said a resetting lever pivoted to the frame and pro
frame and having a depending arm, a pair of vided with a pin for engaging the ?rst lever to '
,
pivotally jointed links constituting a toggle, said move the same to circuit closing position.
WILHELM LEYI-IAUSEN.
toggle having its ends connected respectively to
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