close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2409918

код для вставки
OCÍ- 22, 1946.
F. G. voN HOORN
'
2,409,917
CIRCUIT BREAKER
Filed Feb. 2e, 1943
ma#.wuz
H2
7
m»
l
Inventor:
by
m,
a/«yëfìm‘ëw
Pred G. von H o
His Attorney
2,409,917
Patented 'Oct 22, 1946
UNITEDY STATES PATENT OFFICE
2,409,917
CIRCUIT BREAKER
Fred G. von Hoorn, Nichols, Conn., assi'gnor to
General Electric Company, a corporation of
New York
Application February 26, 1943, Serial No. 477,222
11 Claims.
1
(Cl. 20D-_116)
2
slidably by means of a cylindrical button I3 se
cured to it and extending through a suitable aper
ture in the cover I4 for the casing. As shown
clearly in Fig. '6, the button I3 is secured to the
object a simple and reliable circuit breaker where
in means is provided for manually holding the Ul upper transverse portion of the operating mem
ber, as by a suitable bolt, there being an inverted
circuit breaker in a closed circuit position in
U-shaped guide member having parallel guiding
cluding switching means which short-circuits the
sides I5 and I6 secured to the operating member
thermal load responsive means.
with its base clamped between the button I3 and
In carrying out my invention in one form I pro
the carriage. The guides I5 'and IB are parallel
vide a slidably mounted operating member which
My invention relates to circuit breakers, more
particularly to manually operated thermal over
load responsive circuit breakers, and has for its
is manually operated and which, when moved
slidably to a predetermined closed circuit posi
with the button I3 and they lit loosely in slidable
relation in suitable shallow guides extending ver
tically, as seen in the drawing, in the inner sides
tion, is held in that position by a thermal load
of the walls II and I2. This is indicated clearly
responsive device. On this operating member is
in the drawing 'in which the guide I6 is shown
pivotally mounted intermediate its length a con
fitted loosely in the shallow groove I'I in the side
tact bar which normally is held by a spring in
wall of the casing.
a predetermined angular position on a carriage.
When the manual operating means is moved to
Thus the operating member I0 can be moved
its closed position to be held by the thermal
slidably downward by pressing on the button I3, .
device, one end of the bar engages a stationary 20 its left-hand end bearing, as shown in Fig. 3,
against an .electrically conducting bearing and
contact to close a circuit through the thermal
device. When the manual operating means is
latch member I8 secured to a suitable current re
moved Still farther against the force applied by
sponsive device, shown asa bimetallic thermo
the spring, the other end of the bar engages a
static strip I9 having its upper end secured as by
welding at 20 to an electrically conducting sup
second switch contact whereby the thermal de
vice is short-circuited and the switch can, there
port 2| secured to a side wall of the casing. Thus
when the operating member . II) is moved down
fore, be heldin this closed circuit position man
ward to the position shown in Fig. 2, the hook
ually forv an indefiniter length of time without
shaped latching extension 22 on the left-hand
damage to the thermal .element from excessive
current.
arm of the operating member IEJ is below the
For a more complete understanding of my in
member I3 carried by the thermostat, and the
vention, reference may be had to the accompany
thermostat, in accordance with its bias when at
ing drawing in which Fig. 1 is a View mainly in
a normal ambient temperature, springs toward
cross section of a circuit breaker embodying my
the right hand at its lower end thereby moving
invention showing the circuit breaker moved man- ' the latch member I8 in latch securing engage
ually to its extreme closed circuit position in
ment above the hook 22. Because of the fact
that the operating member I0 is constrained by
which the thermal device is short-circuited; Fig.
2 is a View similar to Fig. l but showing the con
the guides I5 and I6 to move slidably in a di
tact bar in its normal closed circuit position;
rection perpendicular to the engaging faces of
Fig. 3 is a view similar to Fig. 2 but showing the
the latch members I8 and 22, the operating mem
parts after automatic opening in response to an
ber is thus held by the thermostat, as shown in
overcurrent; Fig. 4 is a view taken along the line
Fig. 2, against movement in an upward direction.
4_4 of Fig. 1 looking in the direction of the ar
Mounted on the operating member I0 and ex
rows; Fig. 5 is a View taken along the line 5--5
tending transversely with respect to the line of
of Fig. 3 looking in the direction of the arrows;
movement of the operating member is a current
while Fig. 6 is an exploded view of parts of the
carrying switch member, shown as a bar 23,
operating mechanism.
which is pivoted at a point intermediate its length
Referring to the drawing, I have shown my in
on the right-hand arm of the operating member
vention in one form as comprising a carriage or
so as to be pivotally movable about a pin 24 on
operating member I0 shown substantially as an '
this arm, while the left-hand portion of the arm
inverted U-shaped member. This operating
extends downward somewhat and into a slot
member I0 is mounted for slidable movement be
25 in the left-hand arm of the operating member,
tween the electrically insulating side walls II
the upper wall 26 of which slot forms a stop
and I2 of a suitable casing or enclosure for the
for the bar under certain conditions. Thus the
pivot 24 and the stop 26 are spaced apart trans
mechanism. The operating member is moved
2,409,917
3
4
versely of the line of movement of the operating
of the operating member is completed and, as the
member. The bar and operating member ID are
normally biased upward to an open circuit posi
tion, as shown in Fig. 3, by means of a helical
spring 21 having its lower end resting on the
lower wall 28 of the enclosing casing and its
upper end bearing on the lower edge oi the bar
23 at a point between the pivot 24 and stop 26.
'I'he right-hand end of the bar is provided with
operating member moves still farther downward
to its closed circuit position, the bar pivots coun
terclockwise about the stationary contact 33 and
also pivots counterclockwise about the pin 24
whereby the left-hand end of the bar moves down
ward with respect to the operating member out
of engagement with the stop 26. Thus, as shown
in Fig. 2, the spring 21 not only biases the parts
10 upward, but also it biases the left-hand end ol
the bar upward about the pivot pin E4 thereby to
force downward the right-hand end Contact 29
against the stationary contact 33. This assures
a ñrm engagement between the contacts.
a movable contact 29 arranged to engage a sta
tionary contact 30 mounted on a stud 3| extend
ing through the lower wall of the casing and pro
vided on the exterior with a screw detachable con
nection 32 which forms one terminal of the cir
cuit breaker. On its left-hand end the bar 23
carries a second movable contact 33 which, when
the button I3 is depressed to its extreme lower
position, as shown in Fig. l, engages a second
contact surface 34 secured on a contact stud 35
provided with an exterior terminal 33 forming a
second terminal for the circuit breaker.
For the purpose of including the thermostat I9
in the circuit of the switch, an electrically con
ducting strip or strap 31 is provided which is
seated in a suitable upright shallow groove 38
provided for it in one wall of the circuit breaker
enclosure, the lower end of this strap 31 being
bent laterally and secured to the upper end of
the stud 35. This strap 31 is provided with a lat
erally and upwardly extending arm 39 positioned 'I
between the inner walls of the enclosure. The
upper end of this arm 39 is bent over laterally
to form the support 2| for the upper end of the
thermostat I9. For the purpose of adjusting the
position of this arm 2|, and therefore the posi
tion and current response of the thermostat, a
screw 4U is provided in the end of the support
2 I, which screw bears on the lateral projection 4|
on the upper end of the strap 31, which projection
extends toward the observer, as seen in Figs. 1-3 40
Another feature of my invention is the pro
vision for manually holding the circuit breaker
closed despite the releasing tendency of the ther
mostat I9. This is carried out by pressing the
button I3 downward still farther to the position
shown in Fig. 1 in which the bar 23 has pivoted
counterclockwise about the stationary contact 33
and the pin 24 until its left-hand end has brought
the contact 33 downward into engagement with
the stationary contact 34. This, it will be ob
served, entirely short-circuits the thermostat, for
the circuit through the circuit breaker now is from
the terminal 35 directly to the movable contact 33,
thence through the bar 23, contacts 23 and 33 to
the other terminal 32. Therefore, no appreciable
current flows through the thermostat and it is
not heated. Thus the button may be operated to
hold the circuit breaker closed after it has been
opened automatically by the thermostat, as shown
in Fig. 3, in response to a heavy current or it may,
ci course, be immediately moved to this second
closed position if desired. The short-circuiting
of the thermostat is important in that it prevents
damage to the thermostat from the very high cur
rents which may flow through the circuit breaker.
Of course there would be no object in holding the
inclusive.
circuit breaker closed with currents of normal low
Thus the electric circuit through the circuit
value which would not cause the thermostat to
trip open the circuit breaker.
breaker can be traced from the terminal 35
through the bar 31 and the arm 33 to the upper
As shown in Fig. 3, the bar 23 is provided with
end of the thermostat and thence downward L: a V-shaped notch 45 in its upper edge the sides
through the thermostat to a flexible conductor
of which embrace the pivot pin 24. As shown,
42 which has one end secured, as by welding, to
the bar may be secured to the operating member
the latch member I8 at the point 43 and its other
by means of a partially open slot, one side
of
end secured to the bar 23 at the point 44. The
which is bent outward, the bar put in place in
circuit then leads from the flexible conductor
the slot, and then this side is bent back in place
through the right-hand end portion of the bar
so that the lateral projection 4l on its lower end
23 and when the circuit breaker is in its closed
loosely secures the bar. The upward pressure of
circuit position, as shown in Fig. 2, through the
the spring 21, of course, always holds the bar in
a lateral position in which the pivot pin 24 is
In the operation of the device, assuming that
seated at the bottom of the V notch 45.
it is in its normal closed circuit position as shown
While I have shown a particular embodiment ol
in Fig. 2, upon the occurrence of a current greater
my invention, it will be understood, of course,
than a predetermined value the thermostat I3
that I do not wish to be limited thereto since
is heated by the current passing through it suffi
many modiñcations may be made, and I therefore
ciently to move its lower end toward the left, 60 contemplate by the appended claims to cover any
enough to release the latch 22. The spring 21
such modiñcations as fall within the true spirit
thereupon moves the bar 23 and operating mem
and scope of my invention.
ber I0, together with the button I3, upward to
What I claim as new and desire to secure by
the open circuit position shown in Fig. 3. In this
Letters Patent of the United States is:
position the left-hand portion of the bar 23 is
l. A circuit breaker comprising an operating
contacts 29 and 30 to the other terminal 32.
forced upward into engagement with the stop 26
formed by the upper wall of the slot 25.
When the thermostat has cooled sufficiently so
that it will spring back and secure the operating
member, the circuit breaker may be closed again
by pushing downward on the button I3, as previ
member, supporting means for said operating
member mounting said operating member for
movement in a predetermined direction, a switch
member pivotally mounted intermediate its length
ously described, whereupon the parts assume the
positions shown in Fig. 2. During this downward
on said operating member, a stop on said operat
ing member for engagement by a first end of said
switch member, a spring bearing on said switch
member for biasing the switch member into en
movement the contact 29 engages the stationary
contact 3|) just before the downward movement
gagement with said stop and for biasing the
switch member and operating member to an open
2,409,917
5
circuit position, a stationary contact in position
to be engaged by the other end of said switch
member when said Yoperating member is moved
toward a predetermined closed circuit position
to compress saidy spring and thereafter cause
movement of said ñrst end away from said stop
upon. continued movement of said operating
member to said predetermined closed circuit po'
sition, and current responsive means for engag
ing »and holding said operating member in said
closed circuit position against .the force of said
spring.
2. A circuit breaker comprising an operating
member, supporting means for said operating
member mounting said loperating member for
movement in a predetermined direction, a switch
member extending across said direction of move
ment, pivot supporting means on said operating
6
electric circuit between said stationary contacts
when said operating member is in said interme
diate position.
l
5. A circuit breaker comprising an operating
member, supporting means for said operating
member `mounting said operating member for
movement in a predetermined direction, a switch
member pivotally mounted intermediate its ends
on said operating member, a stop on said oper
ating member for engagement by a iirst end of
said switch member, .a spring bearing on said
switch member for biasing said switch member
into engagement with said stop and for biasing
said switch member and operating member to an
open circuit position, a stationary contact in po
sition to be engaged by the other end of said
switch member when said ope-rating member is
moved to compress said spring and thereafter
cause movement of Said ñrst end away from said
member for pivotally supporting said switch
member on said operating member at a point in 20 stop upon continued movement of said operating
member to a predetermined closed circuit posi
termediate the ends of said switch member, a
tion, thermal current responsive means for re
stop on said operating member for a ñrst end of
s-aid switch member, said stop being spaced from
said pivot transversely of said movement` a spring
bearing on said switch member at a point be
tween said pivot and said stop for biasing said
switch member into engagement with said stop
and for biasing said switch member and oper
ating member to an open circuit posi-tion, a sta
tionary contact in position to be engaged by the ‘
other end of said switch member when said op
erating member is moved toward a predetermined
closed circuit position to compress said spring,
said switch member thereafter upon continued
movement of said operating member «to said closed
circuit position pivoting on said contact and said
pivot so that said ñrst end is moved away from
said stop against the force applied by said spring,
and means for engaging and holding said operat
ing member in said closed circuit posi-tion against
the force of said spring.
3. A circuit breaker comprising a slidably
mounted. operating member, a switch member
mounted on said operating member, a pair of
stationary contacts, said switch member being
movable by said operating member into engage
ment with said stationary contacts, means for
biasing said switch member and said operating
leasably holding said operating member in said
closed circuit position, and a second stationary
contact engaged by said first end of said switch
member when said operating member is moved in
a »circuit closing ldirection beyond said closed
circuit position whereby said switch member es
tablishes a circuit between said stationary con
tacts independent of said thermal device,
6. A circuit breaker comprising an operating
member, supporting means mounting said oper
ating member for sliding movement in a prede
termined direction, a switch bar pivotally
mounted at an intermediate point thereof on said>
operating member, a stop on said operating mem
ber for a iirst end of said bar, a movable electric
contact on the other end of said bar, a spring
bearing on said bar at a point between said in
termediate point and said ñrst end of said bar
applying a force to said bar in a direction to hold
said iirst end of said bar against said stop and
to bias said bar and operating member to a pre
determined open circuit position, manual means
' for slidably moving said operating member and
bar to other positions against the force applied
by said spring, a stationary contact on said sup
port in position to be engaged by said contact on
said bar when said bar is moved manually against
member to an open circuit position, current re
the force of said spring to a predetermined posi
sponsive means for holding said operating mem
tion whereupon said bar pivots on said operating
ber in an intermediate position in which one end
member upon continued movement of said oper
only of said switch member is held by said bias
ating member, current responsive means for en
ing means in engagement with one of said sta
gaging said operating member upon such con
tionary contacts, and connections for including
said current responsive means in an electric cir 55 tinued movement of said operating member
thereby to hold said operating member in a pre
cuit between said stationary contacts when said
determined position when said manual operating
operating member is in said intermediate posi
means is released whereby said contact is held
tion.
by said spring in engagement with said station
4. A circuit breaker comprising a slidably
mounted operating member, a switch member 60 ary contact.
'7. A circuit breaker comprising an operating
pivotally mounted on said operating member at
member, supporting means mounting said oper
a point intermediate its length, a pair of station
ating member for sliding movement in a prede
-ary contacts, said switch member being movable
termined direction, a switch bar pivotally
by said operating member into engagement with
said stationary contacts, a spring bearing on said 65 mounted at an intermediate point of said bar on
said operating member, a stop on said operating
switch member for biasing said switch member
member for a ñrst end of said bar, movable ñrst
to a predetermined position with respect to said
and second electric contacts on said first and the
operating member and said switch member and
second ends of said bar, a spring bearing on said
said operating member to an open circuit posi
bar at a point between said intermediate point
tion, and current responsive means for holding
and said first end of said bar applying a force to
said operating member in an intermediate posi
said bar in a direction to hold said first end of
,tion in which only one end of said switch member
said bar against said stop and to bias said bar
is held by said spring in engagement with one
and operating member to a predetermined open
of said stationary contacts, and connections for
circuit position, manual means for slidably mov
including said current responsive means in an
2,409,917
7
8
ing said operating member and bar to other posi
tions against the force applied by said spring, a
stationary contact on said support in position to
still further whereby said bar forms an electrical
connection between said stationary contacts.
9. A circuit breaker comprising a pair of sta
tionary contacts, movably mounted switch con
tact means, means biasing said switch contact
means in disengaged relation with said stationary
contacts, said switch contact means being mova
be engaged by said second contact on said bar
when said bar is moved manually to a predeter
mined position whereupon said bar pivots on
said operating member upon continued movement
of said _ operating member, current responsive
ble into engagement with said stationary con
means for engaging said operating member upon
tacts to form a circuit between them, current re
such continued movement of said operating mem 10 sponsive means for holding said switch contact
ber thereby to hold said operating member in a
means in a predetermined position in engagement
predetermined position when said manual oper
with only one of said stationary contacts, and
ating means is released whereby said second con
electric connections including said current re
tact is held in engagement with said stationary
sponsive means in an electriccircuit through said
contact, and a second stationary contact on said 15 switch contact means.
support in position to be engaged by said ñrst
10. A circuit breaker comprising a movably
contact when said manual means is moved still
mounted operating member, means biasing said
further whereby said bar forms an electrical
operating member to a predetermined position, a
connection between said stationary contacts.
pair of stationary contacts, switch contact means
8. A circuit breaker comprising an inverted 20 actuated by said operating member normally in
U-shaped operating membery a support mounting
disengaged relation with said stationary contacts
but movable into engagement with said contacts
said operating member for sliding movement in
a direction substantially parallel with its legs, a
first leg of said U-shaped member being extended
and provided with a slot, a switch bar pivotally
to form a circuit between them by movement of
said operating member against its bias to a pre
mounted at an intermediate point of said bar on
the end of the second of said legs and having a
means for holding said switch contact means in
a third position in engagement with one of said
first end extending into said slot, movable first
stationary contacts, and electiic connections in
determined second position, current responsive
and second electric contacts on said iirst and the
cluding said current responsive means in an elec
second ends of said bar, a spring bearing on said 30 tric circuit through said switch contact means.
bar at a. point between the legs of said U-shaped
il. A circuit breaker comprising a movably
member and applying a force to said bar in a
mounted operating member, means biasing said
direction to hold said first end of said bar against
operating member to a first predetermined posi
the upper wall of said slot and to bias said bar
tion, switch contact means mounted on said oper
and U-shaped member to a predetermined open 35 ating member, a pair of stationary contacts, said
circuit position, manual means for slidably mov
operating member being movable to a second pre
ing said U-shaped member and bar to other posi
determined position against its bias to bring said
tions against the force applied by said spring, a
switch contact means into engagement with only
stationary contact on said support in position to
one of said stationary contacts, current respon
be engaged by said second contact on said bar 40 sive means ior holding said operating member in
when said bar has been moved manually to a
said second predetermined position with said
predetermined position whereupon said bar pivots
switch contact means in engagement with said
on said other leg of said U-shaped member upon
one of said stationary contacts, connections for
continued movement of said U-shaped member,
including said current responsive means in
current responsive latching means for engaging
an electric circuit through said switch contact
the end of said extended leg upon such continued
means, and additional switch contact means car
movement of said U-shaped member thereby to
ried by said operating member and electrically
hold said U-shaped member in a predetermined
position when said manual operating means is
released whereby said second movable contact is
held in engagement with said stationary contact,
and a second stationary contact on said support
in position to be engaged by said first movable
contact when said manual means is depressed
connected to said ñrst switch contact means for
engaging both oi said stationary contacts when
said operating member is moved to a third pre
determined position thereby to establish an elec
tric connection between said stationary contacts
independent of said current responsive means.
FRED G. voN HOORN.
Документ
Категория
Без категории
Просмотров
0
Размер файла
776 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа