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Патент USA US2362207

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Nov. 7, 1944.
<;_ w_ KUHN
2,362,207
CIRCUIT CONTROLLING DEVICE
Filed Jan. 29, 1934
2 Sheets-Sheet l
Nov. 7, 1944.
2,362,207
C. W. KUHN
CIRCUIT CONTROLLING DEVICE
Filed Jan. 29, 1934
2 Sheets-Sheet 2
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Patented Nov. 7, 1944
2,362,207
UNITED STATES PATENT OFFICE
2,362,207
CIRCUIT CONTROLLING DEVICE
Clarence W. Kuhn, Milwaukee, Wis., assignor to
Cutler-Hammer, Inc., Milwaukee, Wis., a cor
poration of Delaware
Application January 29, 1934, Serial No. 708,804
25 Claims. (01. 200-815)
This invention relates to circuit controlling de
vices and is particularly applicable to devices for
controlling electric translating apparatus such
as motor driven domestic refrigerators.
The invention has among its objects to pro
Figs. 4, 5, 6 and 7 are enlarged detail sectional
views of the switch unit shown in Fig. 1.
Fig. 8 is a sectional view taken substantially
on line 8—8 of Fig. 4.
Fig. 9 is a sectional view on line 9—9 of Fig. 8.
vide a compact, e?lcient and rugged control de
vice ior motor driven apparatus such as electric
Fig. 10 is a sectional view taken substantially
on line Ill-40 of Fig. 'I, and
refrigerators.
Fig. 11 is an exploded perspective view of cer
Another object is to provide a control device
tain of the parts of the switch unit shown in
for apparatus of the aforesaid character includ 10 Fig. 1.
ing an improved manually operated switch of the
The control device illustrated in Figs. 1 and 2
includes an insulating box-shaped enclosing cas
free tripping overload type, or in other’ words, a
switch which is automatically opened under over
ing I having a switch unit 2, and a fluid condi
load conditions even though its manual operat
tion responsive device 3 mounted therein, said
ing means “is deliberately held in circuit closing 15 casing being provided with a removable side
position.
wall 4 shown in Fig. 3. As hereinafter set forth,
Another object is to‘ provide a switch of the
the switch unit 2 is adapted to be controlled by
aforesaid character which operates with a snap
the ?uid condition responsive device 3 _to effect
action when actuated either manually or auto
starting and stopping of an electric refrigerator,
20 and device 3 is shop adjusted to provide prede
matically.
/
I Another object is to provide a free tripping
termined normal cycles of operation of the refrig
overload switch which is adapted to be reset by
erator and is also adjustable by rotation of a
movement of its manual control means in a di
knob 5 mounted upon the front wall of casing
rection to effect closure of the switch.
i to provide for modi?cation of such cycles. Also
Another object is to provide a switch of the
as hereinafter set forth, the switch unit 2 has
aforesaid character which is closable only upon
an overload responsive mechanism associated
resetting of its associated overload responsive
therewith which is responsive to effect stopping
of the refrigerator under predetermined over
mechanism.
'
Another object isto provide a free tripping
load conditions in the power circuit thereof, and
overload switch of the aforesaid character hav 30 said unit is provided with an operating knob 6
ing improved ?uid condition responsive means
mounted upon the front wall of casing l, which
associated therewith for effecting cyclic operation
is movable axially to start and stop the refrig
erator at will, and to also effect resetting of the
Another object is to provide an improved re
overload mechanism upon response thereof.
i'rigerator control device consisting of a relatively 35
The switch unit 2 is provided with an insulat
small number of parts which can be readily man
ing base 1 and the same includes a pair of sta
uiactured and assembled to provide a compact,
tionary contacts 8 and 9 arranged upon opposite
emcient and durable control unit.
sides of said base as shown in Fig. 3 and a co
Various other objects and advantages of the
operating bridging contact to. Bridging contact
invention will hereinafter appear.
40 I0 is provided with a snap operating mechanism
The accompanying drawings illustrate an em
which is carried by a bracket ll ?xed to insu
bodiment of the invention which will now be de
lating base ‘I. As shown in Fig. 8 said operat
scribed, it being understood that various modi?
ing mechanism includes a pair of oppositely ar
cations may be made in the embodiment illus
ranged U-shaped levers l2 and I3 pivotally
‘trated without departing from the spirit and 45 mounted upon bracket H, and a tension spring
scope of the appended claims.
l4 connected between the free ends of said le
In the drawings,
vers and arranged between the side arms there
Figure l is a side elevatio-nal view of a control
of. Bridging contact I0 is loosely mounted upon
device embodying the invention, a cover associ
the lower end of lever l2 and is insulated there
ated with an enclosing casing for the device be 50 from, and lever I3 is operatively connected to
ing removed.
knob 6.
'
Fig. 2 is a vertical sectional view of the device
-More speci?cally, insulating base 1 is secured
shown in Fig. 1.
‘
to the. side wall I5 of casing I by a screw l6 and
thereof.
>
I
Fig. 3 is a fragmentary sectional view taken '
substantially on line 3-3 of Fig. 1.
said base is recessed as shown in Fig. 3 on the
55 Side adjacent said wall to receive bracket II and
aseaao'r
the parts carried thereby. Bracket II is con-'
tructed as shown in Fig. 11, the same being pro
vided with a horizontally arranged body portion
I‘I having depending side projections I3 and I3
and a depending front projection 20. Bracket II
is secured to the insulating base ‘I by screws 2I
and 22 which extend through said base into
tapped openings in the side projections I3 and
I9. As shown in Figs. 4 and 8 the upper ends
thereof is located slightly to the right of the
pivot of lever I2.
'
The above described switch mechanism is
provided with an overload responsive mecha
nism including an electro-thermal device 43 and
a cooperating latch 43. Electro-thermal device
45 includes an electric heater 41 of helical form.
arranged within a recess 43 in insulating base
‘I, a tubular member 43 ?xed within an opening
of the arms of lever I2 are provided with bear 10 in said base and having one end surrounded by
said heater and a ratchet pin III located within
ing portions 23 which seat within notches in the
said tubular member. Heater 41 is connected
underside of the body portion I‘! of bracket II,
between contact 8 and a rearwardly extending
while the lower ends ‘of the arms of lever I3 are
terminal member 3| fixed to insulating base ‘I
provided with bearing portions 24 which seat
and as shown in Fig. 10 one end of ratchet pin
within notches in the upper side vof the body por
33 is connected to the tubular member 43 by a
tion of said bracket directly above the bearing
portions 23.
‘
Bridging contact I0 is loosely mounted upon
solder connection 52, while the opposite end
thereof is provided with an enlarged toothed
head 33 to be engaged by the latch 48.
a pin 28 secured to the lower end of lever I2 and
Latch 43 cooperates with the upper side of the
is guided by an insulating block 21 interposed be
toothed head 53 on ratchet pin 30, and as shown
tween the same and said lever. As shown in Fig.
in Fig. 10 the under side of said latch rides upon
9, the rear face of block 21 is recessed to receive
aligned bearing parts 54 and 55, the former hear
bridging contact I0 and the front face of said
ing part being formed on insulating base 1 and
block is recessed to receive lever I2 and is also
the latter comprising a pin secured to the side
provided with a center projection 23 which ex 25 projection I3 of bracket II. Latch 43 is biased to
tends into an opening in said lever. Also as shown
move forwardly and also downwardly by a spring
in Fig. 9, block 21 is provided with a center open
56 having one‘ end connected to said latch and its
ing for receiving pin 26 and one end of said
opposite end connected to the lower end of pro
pin is riveted over a metal washer 23 which is
jection 20 on bracket II. The under side of latch
30
insulated from lever I2 by an insulating washer so
46 is provided with struckout portions forming a
while the other end of said pin is provided with
an enlarged head 3| which fits loosely within an
tooth 51 for engaging head 53 of the ratchet pin
and a stop 53 for engaging bearing part 55. and
opening in bridging contact I0 and engages block
the front end of said latch is provided with a pro
21 to hold the same in place upon lever I2.
35 jection 59 for engaging the spring I4. Said latch
Lever I3 is operatively connected to knob 3
is also provided with a forwardly extending pro
through the medum of a slider 32 mounted upon
jection 30 arranged to cooperate with the shoul
bracket II. Slider 32 is provided with a ver
der portion 40 on slider 32 and the rear end
tically arranged side arm 33 (Fig. 11) and the
thereof is provided with a surface 3| arranged to
upper end of said arm is provided with a right
cooperate with a downwardly extending cam pro
angle extension 34 having a slot 35 therein for
jection 62 on the rear end of the body portion I‘!
receiving lever I3, while the' lower end of said
of bracket II.
arm is provided with a hook projection 33 which
The operation of the aforedescribed overload
is guidedrwithin a slot 31 in the side projection II
responsive mechanism will now be described.
of bracket II. The side arm 33 of slider 32 is also ‘ Latch 46 is normally held in the position shown in
provided with a forwardly extending projection
Fig. 5 against the action of spring 56 by engage
38 which is guided within an opening 39 in the
ment of its tooth 51 with the toothed head 53 of
depending front projection 20 of bracket II.
ratchet pin 50. With latch 46 in the position
Projection 33 is bent with respect to the side arm
33 to provide a shoulder portion 40 (Fig-11)
and the same has an opening 4I therein for re
ceiving a connecting member 42 which is secured
to the inner end of knob B by a rivet 43.
In connection with the foregoing it will be noted
that slider 32 is movable by knob 6 to effect .
shown in Fig. 5 its projection 59 is located out of
the path of movement of spring I4 and its pro
jection B0 is located above the shoulder 40 on
slider 32. The switch can thus be opened and
closed as hereinbefore described without disturb
ing said latch.
As will be understood, when the switch is in
movement of lever I3 in opposite directions be
closed position heater 4‘! is connected in the
tween the positions illustrated in Figs. 4 and 5.
power circuit of the apparatus controlled by the
With lever I3 in the position shown in Fig. 5
switch and upon given overload conditions said
the axis of spring I4 is located to the right of the
heater effects fusing of the solder connection 52
pivot of lever I2 and said latter lever is there 60 to permit rotation of ratchet pin 50 within the
fore biased to hold bridging contact II) in en
tubular member 49. Latch 46 is thus released to
gagement with its cooperating stationary con
move forwardly under the action of spring 56 into
a position shown in Fig. 7 wherein stop 53 en
tacts 3 and 9. Upon outward movement of knob
gages bearing part 54. During movement of said
6 lever I3 moves the spring I4 into a position
latch into the position shown in Fig. 7 the pro
wherein the axis thereof is located to the left
jection 59 thereon engages spring I4 and bends
of the pivot of lever I2. As soon as spring I4
the same so that the axis thereof assumes a posi
assumes a position wherein the axis thereof is
tion to the left of the pivots of levers I2 and I3.
located slightly to the left of the pivot of lever
I2 said lever moves with a snap action into the
, position shown in Fig. 4 to disengage bridging
contact I0 from its cooperating stationary con
tacts 8 and 3. Upon inward movement of knob
3 bridging contact I0 moves with a snap action
into the closed position shown in Fig. 5 when
spring I3 assumes a position wherein the axis
Lever I2 then operates with a snap action to
move its associated bridging contact III into open
position, and as is apparent the latch 46 will
cause said lever to operate even though push
button 6 is held in on position. On the other
hand, if push button 6 is released lever I3 oper
ates under the action of spring I4 to move said
3
aaoaaor
push button and the slider 32 outwardly into ‘of!
may be connected to the low pressure side of
the refrigerator to provide for operation of the
bellows by pressure in that part of the apparatus
position.
It will be noted in connection with Fig. 7 that
when latch 46 is released spring 53 is located to
or it may contain an expansible gas and be ar
the left of bearing parts 54 and 55 and the front
end of said latch is thus biased downwardly to
provide for engagement of projection 30 with
ranged at a point contiguous to the refrigerating
apparatus where the temperature and conse
quently the pressure within the pipe and bel
the upper edge of the shoulder portion 40 on
slider 32. However, upon movement of knob 5
.and slider 32 into oil.’ position the shoulder por
tion 40 moves out of engagement with latch 48.
The front end of latch 46 then moves downwardly
under the action of spring 56 into engagement
with a stop 63 on the side arm 33 of slider 32, and
as shown in Fig. 6 the front end of the projection
60 on said latch is then positioned to engage with
lows varies in accordance with operations of the
refrigerator. The front end of bellows ‘HI bears
against a vertically arranged pivoted lever 12
having an adjustable spring ‘I3 associated there
with which opposes expansive movements of the
bellows, and said lever has a snap operating
mechanism associated therewith for effecting op
the rear face of the shoulder portion 40 on said
bracket 14 havinga vertical leg 15 provided with
slider.
an opening for receiving the front end of bel
lows 10 and a horizontal leg 16 arranged below
eration of bridging contact I 0.
.
As will now be set forth, latch 48 is reset and
the switch is reclosed by movement of knob 6 '
inwardly into on position.
As is apparent from
Fig. 6. upon inward movement of slider 32 by
knob 6 the shoulder portion 40 on said.slider
engages the front end of projection 60 on latch 46
to slide said latch inwardly over the bearing parts ~
54 and 55. During inward movement of said
latch from the position shown in Fig. 6, the sur~
face 6! thereon engages the cam projection 62 on
bracket Ii to tilt said latch upon the bearing
parts 54 and 55 into a position wherein the front
end of projection 60 disengages the shoulder por
tion 40 on slider 32. Latch 46 is disengaged from
slider 32 before spring H is moved into a position
to effect closure of the switch and upon disen
gagement of said latch from said slider spring 56
is'located to the rear of bearing parts 54 and 55
and acts to move the tooth 51 of said latch into
engagement with the toothed head 53. The latch
is thus reset in the position shown in Fig. 5 and
during ?nal movement of knob 6 into on position
lever i2 and the contact lil'carried thereby moves
into circuit closing position with a snap action.
In connection with the foregoing it should be
noted that unless the electro-therrnal device 46 is
in condition to retain the latch 46 in the position
shown in Fig. 5 when the same is disengaged from
:
said bellows. The upper end of leg 15 is arranged
within a recess formed in the top wall of easing
i and the rear end of leg 16 is provided with a
projection 11 which is secured to casing I by a
screw 18. Lever 12 has its upper end mounted
upon a pin 19 carried by bracket 14 and the lower
end of said lever is provided with a projection
80 which extends rearwardly below the leg 18
of bracket 14. The spring ‘13 associated with
lever 12 is held under compression between said
lever and a nut 8| mounted upon a threaded
stem 82 which is fixed to knob 5 by a screw 82‘.
Nut 8! is recessed to receive a horizontally ar~
ranged rib 83 on wall i5 of casing I, said rib
being shown in dotted lines in Fig. 2 and the
: stem 8! is rotatably mounted within an opening
in the'front wall of easing i and is held against
forward movement by a shoulder portion at
thereon which engages the rear face of said wall.
Thus upon rotation of knob 5 nut Bi moves
40 axially upon the threaded stem 82 to vary the
degree of compression of spring 13. As shown in
Fig. 2, the inner face of knob 5 is provided with
a channel for receiving a projection 85 on the
front wall of casing l and a stop 86 Within said
ta)
slider 32, said latch will immediately return to
the position shown in Fig. 7 to prevent reclosure
of the switch by knob 6. It should also be noted
that if the switch is opened manually or auto»
matically a portion of the knob 6 which is nor~
.
More speci?cally, lever 12 is carried by a
Fill
mally concealed within the opening in the front
wall of casing i will be exposed to indicate that
the switch is in open position.
To facilitate connection of the aforedescribed
switch unit in the power circuit of the refrig
erator, stationary contact 9 and terminal mem
ber 5i are provided with rearwardly extending
portions which project through openings in the
rear wall of casing in, as shown in Fig. 3, and are
provided with terminal portions 9a and 5|“ ar
ranged upon the rear face of said casing. Said
terminal portions are enclosed by a terminal box
65 having a conductor opening in the upper side
channel cooperates with saidprojection to limit
rotation of said knob in opposite directions.
The snap operating mechanism associated with
lever 12 includes a vertically arranged lever 81
and an over center spring 88. Lever 81 has its
upper end pivoted upon a pin 89 carried by the
leg 16 of bracket 14 and said lever is provided
with a. rearwardly extending projection 90 adja
cent the lower end thereof. Spring 88 is held
under compression between cup washers 9| and
82 and the former cup washer rides upon a
pointed projection 93 ?xed to extension 39 of
lever 81 while the latter cup washer rides upon
a pointed projection 94 ?xed to projection 80
of lever 12. The lower end of lever 81 is mov
able in opposite directions between the rear face
of insulating base 1 of the snap operating mecha
nism and a threaded stop 95 carried by the bush
ing 6‘! and is arranged to operate the bridging
thereof, and as shown in Fig. 2 said terminal box .
contact i0 through the medium of a slidable in
sulating bar 96. The bar 96 is slidably mounted
is secured to casing l by screw 86 which threads
into a bushing 61 secured within therear wall of
is arranged to be engaged by lever 81 whilethe
easing I.
As hereinbefore stated, the above described
switch unit is adapted to be controlled by a ?uid
condition responsive device 3. As shown in Figs.
1 and 2 said device includes a bellows 10 secured
adjacent the upper end of the rear wall of cas
ing I and having a communicating pipe exten
sion ‘II on the rear end thereof. The pipe 1| 75
within a recess in base ‘I and the rear end thereof
front end thereof is arranged to engage bridging
contact in.
With lever 12 in the position shown in Fig. 1
spring 88 is positioned so that the force thereof
acts on a line located in front of~pivot pin 89
of lever 81 and said spring thus acts to hold
lever 81 in engagement with its associated stop
3!. Bridging contact I0 is thus adapted to be
4
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‘
.
9,869,907
switch element out of closed position, one of said
held in closed position as shown in Fig. 1 under
the action of spring II to establish an energiz- .
ing circuit for the refrigerator driving motor.
With the driving motor in operation the tem-,
devices being responsive to predetermined pres
perature within the refrigerator decreases and
upon a predetermined temperature drop deter
mined by the degree of compression of spring 13
sure conditions and the other being responsive
to predetermined overload conditions, said latter
device being responsive free from interference
by said operating member and being resettable
by said operating member upon movement of the
of bridging contact l0 from stationary contacts
out of closed position against the action of said
latter in a direction to move said switch element
bellows l0 permits lever 12 to move rearwardly
into closed position.
under the action of said spring towards the posi
3. In a circuit controlling device, in combina
tion shown in Fig. 2. During such inward move 10
tion, a movable switch member pivoted about a
ment of lever 12 spring ll assumes a position
?xed axis, a, manual operating member there
wherein the force thereof acts on a line located
for, an overcenter spring permanently connect
to the rear of the pivot pin I9 and said spring
ing said members and providing for snap move
then acts to move lever 81 with a snap action
from the position shown in Fig. 1 into the posi 15 ments of said switch member between open and
closed positions upon movement of said operat
tion shown in Fig. 2. Upon movement of lever
ing member in opposite directions, a pressure
81 into the position shown in Fig. 2 bar 8| is
device responsive to move said switch member
moved forwardly to effect snap disengagement
The 20' overcenter spring and to permit reclosure there
of under the action of said spring and an over
temperature within the refrigerator then in
load device responsive to move said spring with
creases and upon a predetermined temperature
respect to said operating member and said switch
increase bellows 10 moves forwardly against the
member to provide for snap movement of said
action of spring 13 into a position wherein spring
switch member into open position independently
88 is positioned so that the force thereof acts
of said operating member, said overload device
on a line located in front of the pivot pin 89.
being resettable by said operating member.
Spring 88 then returns lever 81 with a snap ac
4. In a circuit controlling device, in combina
tion into the position shown in Fig. 1 and bridg
tion, a movable switch member, manual operat
ing contact l0 reengages its cooperating sta
tionary contacts 8 and 8 under the action of 30 ing means therefor including a spring operating
connection for moving said switch member into
spring II to effect restarting of the refrigerator.
8 and 8 for stopping of the refrigerator.
As hereinbefore stated, the temperature at
which the refrigerator is started and stopped is
determined by the degree of compression of
spring 13. In practice the nut 8| is shop ad 85
justed with knob i in a given angular position
to provide for starting and stopping of the re
and out of closed position and for biasing said
member to said position when operated thereto,
a device responsive to predetermined conditions
to move said switch member out of closed posi
tion against the action of said spring operating
connection and to permit return thereof to
frigerator at predetermined temperature values
closed position under the action of said spring
to effect what may be termed “normal” cycles of
operating connection, and an overload device re
the refrigerator is started and stopped or to ef
fect what may be termed “non-normal” cycles
means.
operation of the refrigerator. Upon rotation of 40 sponsive to move said switch member out of
closed position through the medium of said
knob 5 out of said predetermined angular posi
spring operating connection, said overload device
tion the degree of compression of spring 13 is
being resettable by said manual operating
changed to vary the temperature values at which
5. In a circuit controlling device, in combina
tion, a movable switch element pivoted about a
?xed axis, manual operating means therefor in
also shop adjusted, and as is apparent such ad
cluding a spring for moving said element into
Justment provides for variation of the point at
and out of circuit closing position, said‘element
which bridging contact in is opened during
movement of lever 12' inwardly from the posi 50 when moved into such position being yieldingly
‘held therein by said spring, a temperature re
tion shown in Fig. 1 to thereby e?ect variation
sponsive device for moving said element out of
of the range of temperature drop required to
circuit closing position against the action of said
eifect stopping of the refrigerator.
spring and an overload device responsive to
What I claim as new and desire to secure by
55
move
said element out of circuit closing posi
Letters Patent is:
tion through the medium of said spring, said
1. In a circuit controlling device, in combina
overload device being re-settable by said manual
tion, a movable switch element, manual oper
of operation of the refrigerator. The stop 85 is
operating means.
ating means therefor including an overcenter
spring for moving said element into and out of
closed position with a snap action and for bias
6. In a circuit controlling device, in combina
60 tion, a movable switch element having biasing
means associated therewith to yieldingly hold
the same in closed position, a lever movable
about a ?xed axis between opposite extreme po
sitions and arranged to open said switch element
action of said spring and an overload device re
sponsive to move said element of out closed po 65 against the action of said biasing means during
final movement into one of said extreme posi
sition through the medium of said spring, said
tions, and to permit reclosure of said switch ele
overload device being resettable by said manual
ment during initial movement out of said latter
operating means.
extreme position, an over-center spring for mov
2. In a circuit controlling device, in com
bination, a movable switch element, a manual 70 ing said lever in opposite directions between said
ing said element to said position when operated
thereto, a pressure responsive device for moving
said element out of closed position against the
'
operating member therefor, said switch element
when moved into closed position being movable
into and out of such position free from inter
ference by said operating member, and a plu
rality of devices for automatically moving said 76
extreme positions with a snap, and a fluid con
dition responsive device acting directly upon said
spring to effect snap operation of said lever.
7. In an adjustable control device, in combina
tion, amovable switch element having biasing
5
2,869,207
means associated therewith for yieldingly hold
ing the same in closed position, a pivoted lever
movable in opposite directions between givan
limits and arranged to open said switch element
against the action‘oi said biasing means during
?nal movement into one 01‘ said limits and to
permit reclosure of said switch element during
initial movement out of said latter limit, an over
the same in opposite directions between given
extreme positions with a snap, said lever being
arranged to open said circuit controlling device
during final movement thereof into one of said
extreme positions and to e?ect closure of said
‘device during initial movement out of said latter
extreme position, a second lever pivotally mount=
ed upon said bracket and operatlvely connected
directions between said limitsv with a snap, a
to said former lever through the medium of said
spring, a pressure operating bellows mounted
pressure responsive element acting directly upon
said spring to ei’i'ect snap operation of said lever,
spring means acting in opposition to said pres
sure responsive element, a range adjusting ele
ment for varying the tension of said spring
means mounted on one of the side walls of said
center spring for moving said lever in opposite
__ M means and a differential adjusting element asso
ciated with said lever for varying one of the
limits thereof.
upon said enclosing casing and engaging said lat:
ter lever on said side thereof, a spring engaging
the opposite side of said lever to oppose operation
thereof by said bellows and manual adjusting
enclosing casing for varying the tension of said
spring, for effecting resetting of said thermal
overload means upon response thereof, and for
e?ecting opening and reclosure of said circuit
combination, a substantially rectangular box-like‘ 20 controlling device at will.
11. In a. circuit controlling device, in combine.”
enclosing casing, a circuit controlling device
tion, a, pivoted switch member, a manual operat»
mounted within said casing and having thermal
ing member therefor, an over-center spring per
overload means associated therewith for effect
8. In a controller for electric refrigerators, in
ing circuit opening operation thereof, an. operat
ing lever pivotally mounted within said casing
manently connecting said members and providing
upon'response thereof, and for effecting opening
operating member.
for snap movement of said switch member be»
tween circuit opening and circuit closing posiand having an over-center spring associated
tions upon movement of said operating member
therewith for moving the same in opposite direc
between opposite extreme positions, and an elec
tions between given extreme positions with a
tro-thermally controlled device of the solder type .
snap, said lever being arranged to open said cir
cuit controlling device during final movement 30 having a spring biased part releasable automatiu
cally under given electrical conditions to move
into one of said extreme positions and to effect
said spring with respect to said members to pro
closure of said device during initial movement
vide. for snap movement of said switch member
out of said latter extreme position, a second lever
. out of circuit closing position free from inter
pivotally mounted within said casing and ar
ference by said manual operating member and
ranged to operate said former lever through the
to also provide for movement of said manual
medium of said over-center spring, a pressure op
operating member into circuit opening position
erated bellows engaging said latter lever and
upon release thereof, said spring biased part
secured to a wall on one side of said casing, a.
when released being engageable by said operat
spring arranged between said latter lever and a
wall on the opposite side of said casing, and man 40 ing member to e?ect resetting thereof upon move
ment of said operating member in a direction
ual control means‘ mounted on said last men
to effect reclosure of said switch member and
tioned wall for varying the tension of said spring,
said part when reset being disengaged from said
' for effecting resetting of said overload means
12. In a circuit controlling device, in combina
and reclosure of said circuit controlling device at 45
tion, a movable circuit controlling member, a
will.
'
snap operating mechanism therefor including an
9. In a controller for electric refrigerators, in
operating member manually shiftable between
combination, a substantially rectangular box-like
open
and closed circuit positions, said mechanism
enclosing casing, a circuit controlling device
mounted within said casing and having thermal 50 permitting movement of said circuit controlling
member out of circuit closing position free from
overload means associated therewith for eifecting
interference by said operating member, and a
circuit opening operation thereof, a snap operat
. spring biased latch member normally held in a
ing mechanism for said device including a pivoted
given position and releasable upon overload to
lever movable in opposite directions between
given extreme positions to open and close said 55 move said circuit controlling member out of cir
cult closing position independently of said oper
device, a pressure operated bellows engaging said
amng member and to also return said operating
lever and mounted upon a wall on one side of
member to open circuit position upon release
said casing, a, spring for opposing movement of
thereof, said latch member when released being
said lever by said bellows, said spring being ar
resettable in normal position by said operating
ranged between said lever and a wall on the
opposite side of said casing, and manual control - 60 member upon va given movement of the latter
out of open circuit'position, and said latch mem
means carried by said latter wall for varying the
ber when reset in normal position being discon
tension of said spring, for effecting resetting of
said overload means upon response thereof and
nected from said operating member.
'
13. In a. circuit controlling device, in combina
for effecting opening and reclosure of said circuit 65
tion, a switch member movable about a fixed axis
controlling device at will.
.
between open and closed circuit positions, an op‘
10. In a controller for electric refrigerators,
erating member manually shiftable between open
in combination, a substantially rectangular box
and closed circuit positions, an over-center spring
like enclosing casing, a circuit controlling device
mounted within said casing and having thermal 70 connecting said members and providing for snap
movement of said switch member between open
overload means associated therewith for e?ecting
and closed ‘ positions 'by said operating member,
circuit opening operation thereof, a supporting
bracket fixed within said casing, a lever pivotally
and a. spring biased latch member normally held
mounted upon said bracket and having an over
in a. given position and releasable upon overload
rcenter spring connected therewith for moving 76 to move said spring into a. position for e?ectlng
6
2,862,907
movement of said switch member to open circuit
position and for also restoring said operating
member to open circuit position, said latch mem
ber when released being resettable in normal po
sition by movement of said operating member to CI
ward circuit closing position and said latch mem
ber when reset in normal position being movable
out of such position free from interference by said
operating member.
14. In a circuit controlling device, in combina
movable about a fixed pivot to open and close the
circuit, an operating member movable between an
"on” and an "of!" position about a fixed pivot
adjacent the ?xed pivot of said contact element,
a spring connected at one end to actuate said con
tact element and connected at its other end to
said operating member, said spring being mov
sponsive device associated with said operating
mechanism including a latched tripping part nor
mally held in a given position and releasable upon
given overload conditions to eifect movement of
able across both of said pivots upon movement of
said operating member and said spring chang
ing the direction of the bias exerted on said con
tact element and on said operating member as it
crosses their respective pivots, and means re
sponsive to a predetermined condition for apply
ing a force to said spring at a point spaced from
the end thereof connected to said operating mem
vber for moving said spring across both of said
pivots and at the same time increasing the stress
thereof even though the end of the spring con
nected to said operating member is held in "on"
position, said spring after being moved across said
pivots by said means biasing said contact element
said switch member into open circuit position in
to move to and to stay in open circuit position and
tion, a movable circuit controlling member, a snap
operating mechanism therefor including an oper
ating member manually shiftable between open
and closed circuit positions, said mechanism per
mitting movement of said circuit controlling
member into open position free from interfer
ence by said operating member, an overload re
biasing said operating member to move to "01!”
dependently of said operating member, means for
position, and said operating member at some time
connecting said tripping part to said operating
member to provide for resetting thereof upon 25 after operation of said means responsive to a pre
determined condition being operable by a single
movement of said operating part out of open cir
cuit position, and means for disconnecting said
movement from “off" to "on” position to reclose
the circuit.
tripping part from said operating member prior
18. In a circuit interrupter not capable of be
to full movement of said operating member into
closed circuit position.
30 ing set to reclose automatically, means for open
15. In a circuit controlling device, in combina
tion, a switch member movable about a ?xed axis
between open and closed circuit positions, an op
erating member therefor manually shiftable be
tween open and closed circuit positions, an over
center spring connecting said members and pro
viding for snap movement of said switch mem
ing and closing thecircuit including a contact
element movable between two positions, an oper
ating member movable between two positions, a
spring connected at one end to move said con
_ tact element and connected at its other end to
said operating member, said spring biasing said
operating member to whichever of its positions it
ber between open and closed circuit positions by
has been moved and in each case biasing said con
said operating member, an overload devicevin
tact element to its position corresponding to the
eluding a latched tripping part releasable upon 40 position of said operating member, and means re
sponsive to a predetermined condition for apply
ing a force to laterally move said spring at a point
position for moving said switch member into open
position and for restoring said operating member
spaced from the end thereof connected to said
to open circuit position, means for connecting
operating member and said lateral motion of
said tripping part to said operating member to
said spring causing it to change the direction of
provide for resetting thereof upon movement of
its bias applied to said contact element when it
has been moved to a predetermined point and
said operating member out of open position and
means for disconnecting said latched tripping
then acting to move said contact element to the
member from said operating member prior to full
other position and to remain in such other posi
movement of said operating member into circuit 50 tion even though the end of the spring connected
closing position.
to said operating member is held in its original
16. In a circuit interrupter not capable of be
position, and said spring when moved laterally by
ing set to reclose automatically, means for open
said current responsive means to a predetermined
ing and closing the circuit including a contact ele
point also changing the direction of its bias ap
ment movable about a pivot to open and closed 55 plied to said operating member and tending to
positions, a pivoted operating member, a spring
move it away from the position which it former
ly occupied.
connected at one end to move said contact ele
ment about its pivot and connected at its other
19. In electrical apparatus requiring manual -
overload to move said over-center spring into a
end to said operating member, said spring being
operations for setting and resetting thereof,
movable by said operating member back and forth 60 means for opening and for closing a circuit, said
across the pivot of said contact element to there
means being actuated to the open and to the
by alternately bias said contact element to move
closed position by a member having one point
to open and close the circuit with a snap action,
thereof movable to actuate said means to the
and means responsive to a predetermined condi
open and to the closed position and being sup
tion for applying a force to said spring at a point 65 ported at a second point thereof, manually mov
spaced from the end thereof connected to said
able means exerting a force having a line of ac
operating member for moving said spring across
tion normally lying to one side of said second
the pivot of said contact element and thereby
point at which said actuating member is sup
causing said spring to bias said contact element
ported, and a second force exerting means re
to move to and to. stay in open position even 70 sponsive to a predetermined condition for auto~
though the end of the spring connected to said
matically producing relative movement between
operating member is held to prevent movement of
said line of action and said'second point, where
said end of the spring.
by said line of action is moved to and caused to
remain on the opposite side of said second point‘
1'7. In a circuit interrupter notcapable of being
set to reclose automatically, a contact element 75 pending manual movements of said manually
\
2,868,207
movable means, the iorce for e?ecting relative
movement of said line of action and said second
point being supplied by said force exerting means
position until there has been suillcient relative
movement 01' said second point and said line of
responsive to a predetermined condition at a
said opposite side of said point, and said move
point spaced from the point at which said first
means exerting a force is manually movable, said
means for opening and for closing the circuit
ment of said line of action in response to said -
remaining in the closed position until there has
been Su?lcient relative movement of said second
action to cause said line of action to lie on the
predetermined condition causing said operating
member to move to its open position if not held
and the reclosing of said means for opening and
closing the circuit then requiring no movement
point and said line oi’ action to cause said line 10 of‘the operating member other than a movement
to closed position.
oi! action to lie on the said opposite side or‘ said
22. In a circuit interrupter not capable oi’
point.
being set to reclose automatically, switching
20. In electrical apparatus, means for opening
means actuable about a ?xed pivot to cause open
and for closing a circuit, said means being actu
ated to the open and to the closed position ~by 15 ing and closing of the circuit, a pivoted operat
ing member, a biasing spring connected at one
a member having one point thereof movable to
end to actuate said switching means and at the
actuate said means to the open and to the closed
other end in engagement with one point on said
position and being Supported at a second point
pivoted operating member, said operating mem
thereof, means exerting a force having a line of
action normally lying to one side of said second 20 ber being movable about its pivot to'carry the
line of action of the biasing spring across the
point at which said actuating member is sup
?xed pivot oi’ the switching means to move the
ported, an operating member directly engaging
switching means to open and closed positions
said means exerting a force and movable between
an open and a closed position for causing move
with a snap action, and current responsive means
operable upon the occurrence of a predetermined
ment of said line of action back and forth across
condition to act on said biasing spring at a sec
said second point to open and close the circuit
ond point and move the line of action thereof
at will under ordinary conditions, and a second
across the fixed pivot of said switching means
force exerting means responsive to a predeter
mined condition and operable independently of
and to cause it to remain there, even though said
the position in which said operating member may 30 operating member may be held in closed posi~
be held for automatically producing relative
movement between said line of action ~and said
second point, whereby said line of action is moved
to the opposite side of said second point and
caused to remain there pending movement and
resetting‘ of said operating member, the force
for eii‘ecting relative movement of said line of
action and said second point being supplied by
said force exerting means responsive to a prede
termined condition, said means for opening and
for closing the circuit remaining in the closed
position until there has been su?lcient relative
movement of said second point and said line oi.’
action to cause said line of action to lie on the
tion, and cause said biasing spring to initiate
movement of said switching means to open the
circuit.
a
-
23. In a circuit interrupter not capable of be
ing set to reclose automatically, a contact mem
ber, mounted to move about a ?xed pivot for
opening and closing the circuit, a pivoted operat
ing member, a tension spring connected at one
end to actuate said contact member and at the
other end to said pivoted operating member, a
handle member for moving said operating mem
ber about its pivot and thereby move the direc
tion of the bias of said tension spring across said
?xed pivot of the contact member to normally
45 move it to open and closed positions with a snap
action, and current responsive means operable
21. In electrical apparatus, means for open
upon the occurrence of a predetermined abnor
ing and for closing a circuit, said means being
mal condition to apply a force to said tension
actuated to the open and to the closed position
spring at a point spaced from the end of the
by a. member having one point thereof movable
to actuate said means to the open and to the 50 spring connected to the pivoted operating mem
ber and move the direction of its bias on said
closed position and being supported at a second
contact member across the‘pivot of said contact
point thereof, means exerting a force having a
said opposite side of said point.
member, said contact member remaining in
line of action normally lying to one side of said
closed position after movement of said current
second point at which said actuating member is
supported, an operating member movable be 55 responsive means until said tension spring has
moved across the pivot of said contact member
tween an open and a closed position for causing
to bias it to open position and then moving to
movement of said line of action back and forth
and remaining in open position even though said
across said second point to open and close the
handle member may be held in closed position.
circuit at will under ordinary conditions, and a
24. In a circuit interrupter not capable of be
second force exerting means operable only in re 80
ing set to reclose automatically, a contact'mem
sponse to a predetermined condition and inde
ber mounted to move about a ?xed pivot for
pendently oi the position in which said operat~
opening and closingthe circuit, apivoted oper
ing member may be held for beginning to exert a
ating member, a tension spring connected at one '
biasing force tending to produce relative move
ment between said line of action and said second 65 end to actuate said contact member and at the
other end to said pivoted operating member, a
point, whereby said line of action is moved to
handle member for moving said operating mem
the opposite side of said second point and caused
ber about its pivot and thereby move the direc
to remain there pending movement of said oper
tion of the bias of said tension spring across said
ating member from closed position toward open
position and return toward closed position, the 70 ?xed pivot of the contact member to normally
move it to open and closed positions with a snap
force for eil'ecting relative movement of said line
of action and said second point being supplied by
said force exerting means responsive to a prede
termined condition, said means for opening and
for closing the circuit remaining in the closed 75
action, and current responsive means operable -
upon the occurrence of a'predetermined abhor;
mal condition to apply a force to said tension
spring and move the direction of its bias on
8
9,868,907
said contact member across the pivot 01 said con
tact member, said contact member remaining in
closed position after movement oi! said current
responsive means until said tension spring has
moved across the ?xed pivot of the contact mem
ber to bias it to open position and then moving
to and remaining in open position even though
said handle member may be held in closed posi
tion, said handle member when released after be
ing held in closed position being automatically
‘ moved to open position by said tension spring
and the circuit interrupter then requiring no
manual movement of the handle member other
than a movement to closed position to return
15
the contact member to closed position.
25. In a circuit interrupter not capable of be
ing set to reclose automatically, switching means
movable about a ?xed pivot to cause opening and
closing of the circuit, a pivoted operating mem
erating member being movable about its pivot to
carry the line of action 0! said biasing spring
across the ?xed pivot of said switchina means,
said biasing spring changing the direction oi’ the
bias exerted on said switching means immedi
ately upon each crossing of said iixed pivot to
move said switching means to open and closed
positions with a snap action, current responsive
means operable upon the occurrence of a prede
termined condition to move the direction oi’ the
biasing force exerted on said switching means
across the ?xed pivot of the switching means to
move it to open the circuit and to maintain the
circuit open even though said operating member
is held in closed position, said operating mem
ber when released after being held in closed po
sition being moved by said biasing'spring to open
position, and the circuit interrupter then being
operable by movement or the operating mem
ber, a biasing spring connected at one end to 20 ber to closed position to move said switching
means to close the circuit.
actuate said switching means and at the other
CLARENCE W. KUHN.
end to said pivoted operating member, said op
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