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Патент USA US2412934

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Dec. 17, 1946._
E. K. READ
2,412,934
CONTROL APPARATUS
Filed Dec. 12, 1942
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INVENTOR
Ernest K. Read.
2,412,934
Patented Dec. 17, 1946
UNITED STATES PATENT OFFICE
2,412,934
CONTROL APPARATUS
Ernest K. Read, Wilkins'burg, Pa., assignor to
Westinghouse Electric Corporation, East Pitts
burgh, Pa., a corporation of Pennsylvania
Application December 12, 1942, Serial No. 468,7.61
17 Claims. (Cl. 175—294)
2
This invention relates to switches for the con
relay with both coils deenergized and in the nor
trol of electrical apparatus and particularly for
the control of circuit interrupters.
mally open position; and
Fig. 3 is a diagrammatic view showing the relay
An object of the invention is to provide an im
connected in a control circuit for controlling the
proved arrangement for controlling the closing
operation of a circuit interrupter.
Referring particularly to Fig. 2 of the drawing,
the control relay comprises generally an electro
of a circuit interrupter which also prevents re
peated opening and closing or “pumping” of the
breaker.
Another object of the invention is to provide
' magnet H mounted on a base l3 of insulating
an improved control relay wherein a toggle is -
operable by an electromagnet to effect closing
of a control circuit, the toggle being rendered
non-responsive to the action of 'said magnet by
manually operable means.
Another object‘ of the invention is to provide
an improved control relay for controlling the
closing of a circuit interrupter wherein manual
means of screws 29.
anism for the relay contacts inoperative.
Another object of the invention is to provide
an improved control relay wherein the operating
mechanism for the relay contacts is operated by
an electromagnet with means for restraining the
operating mechanism in operative position, and
current-responsive means to effect opening of 02 .2,,
the contacts irrespective of the energized condi
tion of the electromagnet.
Another object of the invention is to provide
an improved control relay with means for latch
31
tion and manual means for rendering said toggle
inoperative at will.
Another object of the invention is to provide
an improved control relay having a magnetically
operated toggle for closing the relay contacts in "
which a thermal element is provided in the con
tact ll, an operating mechanism 19, a thermal
trip device 2| and a manual operating device 23.
The electromagnet l I includes a frame of mag
netic material comprising an upper frame mem
ber 25 and a lower frame member 21, both frame
members being rigidly secured to the base [3 by
means is provided to render the operating mech
ing the contact operating toggle in operative posi
material, a stationary contact l5, a movable con
Two side frame members
also of magnetic material are provided compris
ing plates 3| and 33 (Fig. l) which are secured
by means of screws 35 to the frame members 25
and 21. An intermediate frame member 31 of
magnetic material is suitably secured to the side
members 3| and 33 by screws (not shown). It
will be obvious that the frame of the electro
magnet H may be a one piece casting if desired.
A stationary core member 39 has a reduced upper
end which ?ts in an opening in the upper frame
member 25 of the magnet frame. The lower end
of the core member 39 is also reduced and ?ts
into the upper end of a tube 4| of non-magnetic
material. The tube 4! extends downwardly
through an opening in the intermediate member
31, and its lower end rests on a screw plug 43
threadedly engaging an opening in the lower
frame member 21 of the magnet frame. A look
nut 45 is provided to lock the screw plug 43 in
position. A portion 41 of the plug 43 projects
into the tube 4| and serves as a lower stationary
trol circuit to effect opening of the contacts irre
spective of the operation of the magnet, and man
ually operable means for resetting said toggle to
core member.
operative position.
tube 4| is a movable core member 49 having an
Disposed for reciprocable movement within the
The novel features that are considered char
operating rod 53 secured to the upper end thereof
acteristic of the invention are set forth in par
and projecting upwardly through an opening in
the stationary core 39. Energizing coils 55 and
51 surrounding the tube 4| and core members
are disposed respectively between the interme
diate frame member 3'! and the upper member
25, and between the intermediate member 37 and
the lower frame member 21. It may be noted here
ticular in the appended claims. The invention
itself, however, both as to structure and opera
tion, together with additional objects and advan
tages thereof, will be best understood from the
following detailed description of an embodiment
thereof when read in conjunction with the ac
companying drawing, in which:
Figure l is a top plan view of a relay embodying
the principles of the invention showing the relay
contacts in the closed position;
Fig. 2 is a vertical sectional view taken substan
tially on the line II—-II of Fig; 1 showing the
that the upper coil 55 has a greater number of
turns than the lower coil 51, so that when the
coils are energized simultaneously the upper coil
exerts the greater pull and moves the movable
core 49 upwardly against the stationary core 39.
Also, when both coils are deenergized, the mov
55 able core 49 is biased to a neutral or intermediate
2,412,934.
3
4.
position by a relatively weak coil spring 59 dis
posed in a spring seat in the plug 43 and bearing
sponse to the ?ow of current therethrough, they
de?ect upwardly releasing the toggle support link
89 to effect opening of the contacts |5—l'l as
against the oottom of the movable core mem
will be hereinafter described.
her as.
The manually operable member 23 is provided
The stationary contact i5 is mounted on the
for the purpose of reengaging the toggle support
lower end of a conductor El secured to the upper
link 89 with a latch I89 after the contacts have
portion of the base l3, the upper end of the con
been opened under the control of the thermal
ductor terminating in a connector (not shown)
trip device 2!. The member 23 may also be op
for connecting the contacts in an electrical cir~
cult. The movable contact I‘! is secured to a 10 erated to manually actuate the latch member Iii‘!
to thereby cause opening of the relay contacts
contact arm 63 pivotally supported on a pivot
l5—l'l independently of the coils 55—5'| and of
pin 65 mounted in a channel-shaped switch mem
ber El.
the thermal elements I03.
The switch member 6'! is pivotally
The cup-shaped member or knob 23 is made
mounted on a pivot pin 69 supported in a frame
comprising frame members ‘H and 13 (Fig. 1)
of insulating material and is rotatably and slid
of insulating material secured by means of screws
15 to the upper magnet frame member 25, and
ably mounted on a sleeve III also of insulating
material which is rigidly secured in a recess in
the cross member ll. The knob 23 has a rod H3
rigidly connected at their left-hand ends (Figs.
(Fig. 2) rigidly secured to the inner wall thereof.
The rod H3 projects through an opening in the
1 and 2) by a cross member Tl also of insulating
material. The cross member TI is secured to the
frames "H and 13 by means of screws 19 (Fig. 1).
cross member Ti, and a cam H5 is secured to
the rod on the inner side of the member 17. A
The frame comprising the members 1!,13 and
coil spring H? surrounding the rod H3 and dis
posed between the knob 23 and the cross member
'71 biases the knob 23, the rod H3 and the cam
H5 outwardly, which movement is limited by
Ti may be of one piece moulded insulating ma
terial if desired.
The operating mechanism 19 includes a toggle
comprising links BI and 83 which has one end
pivotally connected by means of a pivot pin 85
to the switch member 67, and the other end of
the toggle is pivotally connected by means of a
pivot pin 81 to a link 89 which is pivotally
mounted on a pivot pin 9! supported in the
frames H and 73. The toggle links 8! and 83 are
pivotally connected together by a knee pivot pin
93. The toggle link 8| has spaced sides rigidly
connected by a yoke Q5, and the toggle link 83
comprises a pair of parallel links. The link 89
supporting the left-hand end of the toggle 8 i—83
is U-shaped having its sides connected by an in~
tegral cross portion 91, the upper end of which is
formed over substantially as shown at 98 (Fig. 2).
Contact pressure is provided by a leaf spring
99 having an arcuate lower end bearing against
the pin 35. The upper end of the spring 9t bears
against the contact arm 63 and the mid-portion
of the spring 99 is borne upon by the connecting
part of the channel-shaped switch member 61 to
engagement of the cam I I5 with the cross mem
ber 11.
~
After the contacts [5-11 have been operated
to the open position by the action of the thermal
trip device 2|, releasing the support link 89, the
link may be reengaged with the latch I09 by
pressing the knob 23 inwardly. At this'move
merit, the inner end of the rod H3 engages the
pivot pin 8'! and rotates the link- 89 clockwise to
reengage the end 93 of the link with the latch
H19. Also during the inward movement of the
knob 23, projection H9 on the inner part thereof
engages a slot [2! in the sleeve III to prevent
rotation of the knob 23 and consequently of the
cam H5.
The purpose of the cam I l 5 is to manually dis
engage the latch lll9 from the support link 89 to
thereby render the device non-responsive to the
electromagnet H. The manual operation of the
latch ID‘! iseffected by rotation of the knob 23
and, therefore, of the cam I I5 in either direction.
During this rotation, the cam H5 engages and
tension the spring in a direction to bias the con
tact arm 63 in contact closing direction. When
raises the latch member l9‘! to disengage the
latch its from the end 93 of the link 8.‘), thus
rendering the relay inoperative to close the, cone
the switch arm 6'‘! is in the open position (Fig.
2), the clockwise movement of the contact arm ,
53 about its pivot 65 is limited by a projection I09
thereon striking the pivot pin 85 which connects
the toggle link 8! to the switch member 5?.
tacts or to hold the contacts closed. In this man;
ner, the relay contacts may be opened and held
The switch member 61 is biased in a counter
clockwise or opening direction by a coil spring llll
having one end hooked over the right-hand end
of the frame members 7! and 13 and the other
in the open position irrespective of the energiza
tion of the coils 55-5l and operation of the
the latch We normally prevents counterclockwise
latching position.
rod 53.
When the knob 23 is rotated in order to render
the closing mechanism ineffective to close the con
end bearing against the switch member.
tacts, the projection H9 on the knob is moved
The thermal trip ‘device 2| is provided to cause
automatic separation of the contacts l5—|1 in 60 away from the slot i2! in the sleeve in order to
prevent inward movement of the rod H3. This
the event that the relay remains energized too
prevents movement of the rod to actuate the link
long, or if the current traversing the circuit of
89 to relatching position While the latch I0? is
the device is of too great a value. The trip device
held in unlatching position by the cam H5. In
comprises a pair of bimetal elements “33 secured
order to reset the device, the knob 23 is ?rst ro
by means of screws I05 to the insulating frame
tated to align the projection E £9 with the slot I25.
‘13 and extending inwardly therefrom (Fig. 1).
This moves the cam H5 out of engagement with
At their inner ends, the bimetal elements I63
the latch member H37, and the resilience of the
carry a latch member Hl'l of conducting material
bimetal elements H33 moves the latch member
suitably rigidly secured thereto and having a
llll downwardly until the latch Hi9 rests upon the
latching projection I09 normally in engagement
top of the projection 98. The knob 23 may now
with the formed end 98 of the support link 89.
be thrust inwardly to actuate the link 89 to re
The engagement of the end 98 0f the link' 89 with
Hi3 are heated a predeterminedramount in re
.
The relay is shown in Fig. 2 with the coils 55
rotation of the link. When the bimetal elements
75
and El deenergized and the contacts in the nor-_
2,4'12,934 .
7
tively movable relay contacts, an operating toggle
operatively associated with said contacts, a pair
8
releasable member to effect opening of the relay
contacts irrespective of the energized condition of
said electromagnet, and manually operable means
of electromagnets having an armature for actu
ating said toggle to close said relay contacts, a
to reset said releasable member.
control circuit, said electromagnets being con U!
5. In a control relay, the combination of rela
nected to be energized by said control circuit, one
tively ‘movable relay contacts, a toggle having
of said electromagnets having a greater attractive
one end operatively associated with said relay
force than the other, means operated by the clos
contacts, a releasable member supporting the
ing of the circuit interrupter to deenergize said
other end of said toggle, electromagnetic means
one electromagnet and permit the other of said 10 comprising an electromagnet for operating said
electromagnets to attract and restrain the arma~
toggle to close the contacts, a bimetallic latch
ture in inoperative position, and a thermal ele
normally engaging and restraining said releas
ment releasably restraining said toggle in oper
able member in a ?xed position, said bimetallic
ative position, said thermal element being heated
latch being operable in response to predeter
in response to the current in the control circuit
mined abnormal conditions to release said releas
and operable to release said toggle to thereby
able member to thereby eiTect automatic opening
cause opening of said relay contacts and deen
of the relay contacts irrespective of the energized
ergization of said closing means irrespective of
condition of said electromagnetic means, and
the energized condition of said electromagnets.
manually operable means movable to one posi
2. An electrical apparatus, the combination of
tion to engage and reset said releasable members
a circuit interrupter having closing means, a re
and settable to another position to engage and
lay for controlling the energization of said cir
render said bimetallic latch permanently ine?ec
cuit interrupter closing means including rela
tive to restrain said releasable member.
tively movable relay contacts, operating mecha
6. In a control relay, normally open contact
nism for said relay contacts, a pair of electro— 25 means, a toggle operatively associated with said
magnets having an armature for actuating said
contacts, electromagnetic means for operating
operating mechanism to close said relay contacts,
said toggle to close the contacts, thermally re
one of said electromagnets when energized having
sponsive means for engaging and‘ releasably re
a greater attractive force than the other, a, con
straining said toggle in operative position, said
trol circuit, said pair of electromagnets being 30 thermally responsive means being operable in
connected to be energized by said control circuit,
response to predetermined abnormal conditions
means operated by the closing of said circuit
to release said toggle, and manual means oper
' interrupter for deenergizing said one electromag
able on one direction to engage and reset said
net to permit the other of said electromagnets to
toggle to operative position and operable in an
attract and restrain the armature in inoperative 35 other direction to actuate said thermally re~
position, a trip device including a thermal ele
spo-nsive means to release said toggle.
ment heated in response to the current in the
7. In an electrical apparatus, the combination
control circuit and operable when heated a pre
determined amount to cause opening of said relay
contacts irrespective of the energized condition
of said pair of electromagnets, and manually op
erable means for resetting said trip device.
3. In an electrical apparatus, the combination
of relatively movable relay contacts for control
ling the energization of an operating device, a
control circuit for energizing said operating de
vice, operating mechanism for said relay con
tacts including a toggle operable to close said
relay contacts, means for releasably restraining
one end of said toggle in operative position, means '
comprising an electromagnet having an armature
for actuating said toggle to close the relay vcon
tacts, a trip device including a bimetal element
heated in response to the current of said control
Of a switch member movable to a closed and an
open position for controlling the energization of '
a circuit interrupter operating device, a control
circuit for energizing said operating, device, op
erating mechanism for said switch member in
cluding a toggle operatively associated with said
switch member, means comprising a current re
sponsive element for engaging and restraining
said toggle in operative position, electromagnetic
means comprising a pair of windings operable
when energized to operate said toggle to an un
derset position to move said switch member to
closed position, and to hold said switch member
in closed position only when said magnetic means
is energized, said current responsive means op
erable in response to the current of the control
circuit to release said toggle and thereby effect
circuit, said bimetal being operable to effect open
movement of said switch member to open position
ing of the relay contacts irrespective of the ener
to deenergize the operating device, and a rotat
gized condition of said electromagnet, and man
able member for operating the current respon
ual means for resetting said restraining means,
sive element to release the toggle.
said manual means being settable to a position to
8. In a control relay, the combination of rela~
permanently render the toggle ineffective to close 60
tively movable contacts for closing and opening
the relay contacts.
a control circuit, a switch member movable to
4. In an electrical apparatus, the combination
close and open said contacts, operating mecha
of an operating device, a control circuit for ener
nism for said switch member including a toggle,
gizing said operating device, relatively movable
relay contacts for controlling said circuit, operat
means comprising a thermal element for engag
ing mechanism for said contacts including a tog
ing and releasably restraining said toggle in op
gle having one end operatively associated with
erative position, electromagnetic means for op
said contacts, the other end of said toggle being
erating said toggle including a pair of windings,
supported on a releasable member, electromag
one of said windings when energized exerting
netic means for operating said toggle to close the
a greater force than the other of said windings,
contacts, means comprising a bimetal element for
means for deenergizing said one winding to per
restraining said releasable member in ?xed posi
mit the other of said windings to effect opening
tion, said bimetal element being heated by the
movement of the toggle and said switch member,
current of the control circuit and operable when
said thermal element being operable in response
heated a predetermined amount to‘ release said
to predetermined ‘conditions in the control cir
2,412,934.?
mally open position, When both coils are'ener- ,
gized the .attractive force produced by the upper
coil predominates and moves the core 49 upwardly
against the stationary core 39, thereby thrusting
the spring IOI to actuate the switch member 67‘
to the open contact‘ position. The movable core
49 will be held against the lower stationary core
41 as long as the control switch I53 is held closed,
BI—83. Since at this time the link 85 is latched
energizing the coil 51, thus holding the energizing
circuit for the interrupter operating winding I25
against counterclockwise movement, the thrust
open.
the rod 53 upwardly to straighten the toggle
of the toggle rotates the switch arm 5? clockwise .
to close the contacts. The upward Or straighten
If the circuit interrupter i2? is closed while
an abnormal circuit condition is present in the
' ing movement of the knee of the toggle 8I—83 is 10 main circuit, the circuit interrupter will be tripped
to open position, thereby opening the auxiliary
limited by‘the yoke 95 engaging a pin I23 mounted
inv and extending between the toggle links 53 to
the left of the knee pin 93. The limiting stop I23
limits upward movement of the toggle to a slightly
underset position in which the knee pin -93 is 15
switch I37. If the control switch I43 is in closed
position at this time, the coil 55 is again ener
gized, but the attractive force of the coil 55 is not
slightly below a line joining the pivot pins 85—8‘I.
and the stationary core 5?, and the relay contacts
Consequently, when the coils 55—5'I are deener
gized and the core 45. and rod 53 resume their
normal position, the spring It! acts to move the
switch arm 51 to open position, the toggle til-83
collapsing to the position shown in Fig. 2.
Referring to Fig. 3, the operating winding I25
of a circuit interrupter, shown schematically at
I2‘! is connected in series with a control circuit
I2;9——I3I, the circuit extending from the con
ductor I29 through the winding i525, over a wire
I33, thru the bimetal elements I03 and latch
member IIJ'I, a flexible shunt conductor I35 con
necting one of the bimetals £53 to the movable
contact I7, the contact l5 to the conductor 53!.
The coils 55 and 5'! are connected in series relation
across the conductors l25—i5l. An auxiliary
switch I3? is operated by the circuit interrupter
I2? and is employed to short circuit the upper or
great enough to move the core 45 from the coil 5‘!
I5-l'l will remain open as long as the control
switch M3 is held closed.
.
,
When the control switch I43 is opened, both of
the coils 55 and 5'! are deenergized and the spring
59 moves the core 49 to its neutral position as
shown in Fig. 2.
By the use of the toggle iii-83, a mechanical
advantage is gained which permits the use of less,
force for closing the relay contacts. The relay is,
therefore, of a design which provides a longer
interval of time before the magnetic flux falls to
the point where the relay contacts will open.
This is a desirable advantage because is provides
sufficient time delay after the relay closing coil
55 is shunted out to permit the circuit interrupter
to be moved to full closed position and latched
closed before the operating winding l 25 is deener
gized by opening of the control relay contacts
relay closing coil 55 when the circuit interrupter 35
Another advantage of the invention resides in
I2? is in closed position, the contacts of the aux
the provision of the thermal trip device which
iliary switch I31 being connected to opposite sides
functions to cause opening of the relay contacts,
of the coil 55 by means of Wires I39 and ME. A
if the relay stays closed too long or if the current
control switch I53 is connected in series with the
coils 55--5'I.
.
40 is too} great in the control circuit. The relay
contacts will be tripped open in response to oper
The circuit breaker l2? may be tripped open by
ation of the thermal trip device irrespective of
means of a trip coil Itia'energized by any suitable
the position of the closing mechanism, and irre
means, for instance, a protective relay‘ (not
spective of energization of the relay closing coil
shown), in response to abnormal conditions in the
55, thus protecting the operating winding I25
circuit controlled by the breaker I21. With the
from damage resulting from abnormal circuit
circuit interrupter l2‘? in open position and the
conditions in the contact circuit. The bimetal
control relay contacts l5—l'l open, as shown in
element I03 is calibrated to de?ect and release
Fig. 3, it is necessary to close the contacts i5—i'l
the toggle in response to prolonged flow of normal
of the relay in order to energize the interrupter
operating winding I25. This is eifected by clos 50 current in the control circuit.
In addition, there is provided manually op
ing the control switch :53 to simultaneously ener
erable means for resetting the trip device follow
gize the coils 55—57. Because the coil 55 produces
a greater magnetic force than the coil 57, the mov
ing an automatic opening or the contacts in re
able core 55 will, upon energization of the coils,
sponse to abnormal conditions. The manually
be attracted upwardly to effect closing of the
operable means is also operable to effect opening
contacts I5--ll in the previously described man
of the relay contacts irrespective to the position .
ner to complete the circuit to the operating wind
or energized condition of the relay closing coil 55
ing I25. Upon energization of the Winding I 25,
and also to render the operating mechanism' of
the circuit interrupter I21 is operated to its closed
the relay non-responsive to the coil 55 to close
position where, under normal conditions, it re 60 the contacts so that the relay cannot be oper
mains latched against an accelerating spring I55
ated to close the contacts as long as the knob 23
which biasesithe interrupter to open position due
is in looking position.
to the overcenter condition of an operating toggle
Having described a preferred embodiment of
the invention in accordance with the patent stat
Toward the end of the closing movement of the 65 utes, it is to be understood that various changes
circuit interrupter I27, the auxiliaryswitch I37
and modi?cations may be made therein without
closes the circuit that shunts out the relay closing
departing from some of the essential features of
coil 55. shunting out the coil 55 causes the mag
the invention. It is, therefore, desired that the
netic ?ux of the core 39 to fall to a point where
language of the appended claims be interpreted
the still energized coil 57 will attract the movable
as broadly as the prior art permits.
I47.
'
‘
core 59 and move the core 49 and the rod 53 to
the lowermost limit of their downward travel
wherein the movable core 49 is held against the
I claim as my invention:
1. In an electrical apparatus, the combination
of a circuit interrupter having closing means, a
stationary core 41 (Fig. 2) '. The downward move
relay for controlling the energization of said cir-~
ment of .the rod, as previously, described, permits .75 cuit. interrupter closing means including rela
'. 9
2,412,934
cuit to release the toggle to thereby e?ect open
ing movement of the toggle and the switch mem
ber irrespective of the energized condition of
said windings.
9. In a control relay, the combination of rela- '
tively movable contacts, a switch member op
erable to close and open said contacts, operating
mechanism for said switch member, means for
10
to actuate said thermal element to a permanent
non-restraining position.
13. In a control relay, the combination of rela- ‘
tively movable contacts, a toggle movable to an
underset position to close said contacts, electro
magnetic means for moving said toggle to close
said contacts and hold said contact closed only
when said electromagnet is energized, means for
causing energization of said electromagnet, said
eiectromagnet comprising a pair of windings one
of said windings having a greater force than
the other for moving said toggle to close the
contacts, switch means operable upon closure of
able core member including a pair or“ windings,
one of said windings when energized exerting 15 said contacts for effecting deenergization of said
one winding, said other winding upon deener
a greater force than the other winding on said
gization of said one winding attracting and mov
movable core member, means for deenergizing
ing said armature to permit movement of said
said one winding to permit the other winding
toggle to open said contacts.
to attract and restrain the movable core member
14. In a control relay, the combination of rela
in inoperative position, and manually operable
means for operating the restraining means to 20 tively movable contacts, a linkage movable to an
underset position to close said contacts, an ar
permit movement of' the operating mechanism
mature for moving said linkage to said underset
and the switch member to open position irrespec
position, and an electromagnet comprising a pair
tive of the energized condition of said windings.
of windings for actuating said armature, means
10. In a control relay, the combination of re1a~
for effecting simultaneous energization of said
tively movable contacts,’ a switch member mov 25 windings, one of said windings having a greater
able to close and open said contacts, operating
attractive force than the other winding for op
mechanism for said switch member including a
erating the armature to close the contacts, means
toggle operable to an underset position to move
operable upon closure of said contacts to eifect
the switch member to close the contacts, electro 30 deenergization
of said one winding, said other
magnetic means for actuating said toggle to move
winding upon deenergization of said one winding
said switch member to closed position, said toggle
attracting and moving the armature to thereby
holding said switch member in closed position
permit movement of said linkage to open the
only when the electromagnet is energized, and
contacts.
releasably restraining the operating mechanism
in operative position, a movable core member
operable to actuate the operating mechanism to
move said switch member to closed position,
electromagnetic actuating means for said mov
manual means operable to render said electro~
magnetic means permanently ineffective to move
the switch member to close the contacts irrespec
tive of the energized condition of said electro
magnetic means.
11. In a control relay, contact means, operat
15. In a control relay, the combination of rela
tively movable contacts, a toggle movable to an
underset position to close said contacts, an ar
mature for moving said toggle to said underset
position, electromagnetic means including a pair
of windings, switch means for energizing said
ing mechanism for said contacts, electromagnetic
windings, one of said windings exerting a greater
means operable when energized to actuate said
attractive force than the other for operating
’ operating mechanism to close the contacts, said
said
armature to close the contacts, switch means
operating mechanism being capable of holding
for deenergizing said one winding, said other
said contacts closed only when said electromag 45 winding
upon deenergization of said one winding
netic means is energized, thermally responsive
moving
the
armature to a position to permit
means releasably restraining said operating
movement of the toggle to open the contacts,
mechanism and operable in response to prede
a thermally responsive element operable to effect
termined abnormal conditions to release the oper
opening of said contacts irrespective of the ener
ating mechanism and eifect opening of the con
gized condition of said windings.
tacts irrespective of the energized condition of
16. In a control relay, the combination of rela
the electromagnetic means, and manually op
tively movable contacts, a toggle movable to an
erable means movable in one direction for actu
underset position to close said contacts, an ar
ating said thermally responsive means to effect
mature for moving said toggle, electromagnetic
release of the operating mechanism and opening
means including a pair of windings, switch means
of the contacts irrespective of the energized con
operable to energize said pair of windings, one
dition of the electromagnetic means, said man
of said windings exerting a greater attractive
ually operable means being movable in another
force than the other winding for operating said
direction to reset said operating mechanism to
armature to close the contacts, a switch operable
operating position.
60 to cause deenergization of said one winding, said
12. In a control relay, the combination of rela
other winding upon deenergization of said one
tively movable contacts, a switch member‘ mov
winding
moving the armature to permit move
able to close and open said contacts, operating
ment of said toggle to open said contacts, a ther
mechanism for said switch member including a
mally responsive element operable to e?ect move—
linkage, electromagnetic means for operating said
ment of said toggle to open said contacts irre
linkage to an underset position to move said
spective of the energized condition of said wind
switch member to close the contacts, said linkage
ings, and manual means for resetting said toggle.
holding the contacts closed only when said elec
17. In a control relay, the combination of rela
tromagnet is energized. a thermal element re
leasably restraining said operating mechanism 70 tiveiy movable contacts. a toggle movable to an
underset position to close said contacts, an ar
and operable in response to predetermined ab
mature for moving said toggle, electromagnetic
normal conditions to effect movement of said
means including a ‘pair or" windings, a switch for
linkage and said switch member to open the
effecting energization of said windings, one of said
contacts irrespective of the energized condition oi
windings exerting a greater attractive force than
the electromagnet, and manual means operable
the other winding for operating said armature
2,412,934
11
to close the contacts, a switch operable to deenergize said one winding, said other winding
upon deenergization of said one winding operating the armature to a position to permit movement of said toggle to open said contacts, a 5
thermally responsive element operable to eifect
‘movement of said toggle to open the contacts
12
irrespective of the energized condition of said
windings, andmanual means operable to reset
said toggle, said manual means being also oper
able to e?ect movement of said toggle to an in
operative position.
'
ERNEST K. READ.
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