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Патент USA US2116002

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May 3, 1938.
B. E. SHAW
2,116,002
REFRIGERA'TING SYSTEM
Filed Oct. l5, 1936
`
2 Sheets-Sheet l
¿y 5m), ¿ef/nm 5MM
May 3, 1938»
I B. E. sHAw
I
2,116,002
REFRIGERATING SYSTEM
Filed Oct. 15, 1936
2 Sheets-Sheet 2
î Patented May [3, 1938
2,116,002 " '_
UnlTED ` STATES PATENT “OFFICE
Manatre
'
, `mirare.Enrrrnm SYSTEM
Burton E. Shaw, Adel, Iowa, assigner to Penn
Electric Switch Co., Des Moines, Iowa, a cor
poration oi' Iowa
` Application October 15, 1936, Serial No. 105,683
22 Claims.
An object of my-presentinvention is _to pro-_
vide a refrlgerating system in which a-freezer
compartment can be automatically maintained
at a predetermined temperature and manually
set for being dropped to a lower temperature
interconnection between control switches is pro
vided rather than a mechanical one, as shown in
Figure 4.
`
the numeral it to indicate generally a housing.
when a new _batch of cream or the like to be
Within the housing l0, a support it is provided>
which carries a pivot pin il.` An armature i6 is
frozen is placed therein, the system being com
paratively simple ’and inexpensive from a manu
pivoted to the pin I 4 and is provided with con- '
facturing standpoint.
lll
A further object is to provide in connection
-with a batch freezer and an agitator therefor, a
‘
I motorfwhich may be energized by a manually
controlled switch, the switch edecting continu
ous operation oi' va refrigerant compressor while
the agitator motor is in operation.
A iurther object is to provide mechanical
means-and an equivalent electrical means in a
modined form `of construction for causing the
¿refrigerant compressor to operate continuously,
'it thisbeing accomplished automaticalkv whenever
the switch lor the freezer agitator motor is man
ually moved to closed circuit position.
, A' further object is to provide controls of this
character which, in addition to accomplishing
at: the results above outlined, still permit the auto
`wieoperation of safety features, such as over
~lo
protecting devices and excessive refrigerantY
pressure responsive devices.
r-other object is to provide an automatic
switch for a refrigerating mechanism and a man
ual switch for a freezer motor, the manual switch
being connected either mechanically or electri
cally with the `automatic control switch to render
it ineffective in its automatic capacity, while the
, freezer` motor is in operation, with thel exception
f of automatic safety devices still being operable
tocontrol the reirigerati'ngfmechanism.
- With these and other objects in view, my in
il)
vention consists in the construction, arrange
ment and combination of the various parts of the
device, whereby the objects contemplated are at
tained, as hereinafter more fully set forth, point
_ ed out in my claims, and illustrated in the ac
'thi
companying drawings, in which:
Figure l is a front elevation of a control switch
used in connection with my refrigerating system.
. Figure 2 isa sectional view on the line i-~i
Figure 3 is an enlarged sectional view on the
line 'i-t of Figure 2.
„
Figure d is a diagrammatical view showing the
sys
in control of the switch illustrated in Fig
ures l, 2, and 3; and
_
Figure 5 is a diagrammaticai view of' a modi-l
ned vform of construction in which an electrical
‘ -
On the accompanying drawings, I have used
i
tacts it for controlling an electric circuit. The
armature it is controlled automatically by a link ic'
2t connected with a bell c?ank it. The' bell
crank it is pivoted at 2t and is omrated auto
matically by a pressure bellows it opposed by an
adjusting spring 28. The bellows it has a capil
lary tube connection Zt with a temperature re 15
sponsive bulb il.
‘1. overload safety device is provided for the
switch contacts it and comprises the following
elements: A resistance heater if; aìbimetal latch
it responsive to the temperature thereof; a latch v20
` pin it carried by a latch lever it pivoted at il:
d a trip lever di pivoted on the pin it.
The trip lever t has a latch lug til cooperating
with a latch lug it on the latch lever t, and has
pivoted toit a reset lever it. For resettingpur Eb
poses a _reset knob i is provided having a pin
bi for ~operating the reset lever llt.
,_„
A safety devicefor excess pressure in the high
side of a refrigeratingsystem is Aprovided for the
switch arm it and comprises the following ele d@
ments: A pressure bellows il; a lever tt operated
thereby and opposed by a spring i; a primary
over-center lever tt and a secondary over-center
lever tf both pivoted on a pin tt: a link connec
tion tt between the lever bt and the lever tt;
and. an over-center spring tt.
In my controller ll provide a manual switch A ,
which is an “oir”A and v"011” snap switch, the
operating handle thereof` being indicated at ll.
The switch Al is mounted within the housing ld 40,
and may be controlled from the outside of the '
housing by a control knob 'il connected with a
forked lever lt, the forked end of which strad
dles the operating handle it. The lever 'it is
eilective to modifyI the action of the bell crank if titi
through the medium of a rock shaft 'it having a
projection lt adapted to engage the lever if and
hold it in closed circuit position when the switch
A is adjusted to “on” position. This is accom
plished by connecting the rock shaft 'it with the d@
lever lt by means of a lever it on. the rock shaft,
and a link connection di between the levers it
and til.
The switch A is fully disclosed in Fat
ent No. 2,051,943, issued August 25, i936.
Referring to Figure i, a refrigerant compressor'
2
2,1 16,002
84 is illustrated driven by a motor 86.
'I'he con
denser coil of the refrigerating system is indi
cated at 88 and the evaporator thereof at 90.
The contacts I8 it will be noted are connected in
the circuit of the motor 86. 'I‘he bulb 30 is ar
ranged adjacent the evaporator 90 so as to be re
sponsive to the temperature produced thereby.
The safety bellows 54 is connected by tubing or
the like 92 to the high pressure side of the re
10 frigerant compressor. A compartment 94 is as
sociated with the evaporator- 90 to be chilled
thereby, and an agitator 86 for the contents of
the compartment is provided.
»
A freezer motor 98 operates the agitator 06
15 and is controlled by the switch A. The switch
A includes an overload feature shown diagram
matically in Figure 4 and comprises a resistance
heater |00 in the circuit of the motor 98, a bi
metal latch |02 and a lever |04 latched thereby
20 and adaptedto open the switch A whenever the
lever |04 is unlatched.
-
In Figure 5 I have shown a modification in
which individual switches B and C control the
motor 86.` The switch B is responsive to the tem
25 perature of the bulb 30 only, while the switch C
may be operated to break the circuit -either by
the safety bellows 54 or the overload blmetal
latch 34. The switch A is the same, and an ad
ditional wire indicated at |06 is utilized to pro
30 vide a connection with the switch A, which causes
the switch A, when closed, to shunt the switch B
out oi the circuit.
Thus with the form of invention shown in _
Figure 4, the control switch for the motor 86 is
35 mechanically retained in closed circuit position,
while, as disclosed in Figure 4, the switch B for
automatically controlling the refrigerant com
pressor 84 in response to the temperature pro
duced by the _evaporator 80 is shunted so that
40 even when it is open, the circuit for the motor 86
will be maintained as long as the switch A is
closed.
‘
'
.
Practical operation
In the operation of the- system shown in Figure
4, with the parts in the position illustrated by
full lines, the refrigerant compressor 84 is being
operated and is automatically controlled by the
temperature responsive bulb 30. This is desirable
in ice cream plants and the like where between
batches the compartment 94 should be kept at a
predetermined low temperature. When a batch
of cream is put in the compartment“ for freez
ing, in order to effect quick freezing, itis desirable
r55
to run> the refrigerant compressor continuously.
A_ switch must be provided for the agitator
lever 22 so that as illustrated in Figure 4, the bi
metal 34 can unlatch or the bellows 54 trip the
over-center lever 62 in a clockwise direction, all
as shown by dotted lines in Figures 4, thus sepa
rating the contacts I8.
,
'I‘he lever 62, when swung in a clockwise direc
tion, engages a cross bar |'| of the armature I6
to move it upwardly. If an overload in the cir
cuit of the motor 86 occurs, the right hand end
of the bimetal lever 34 in Figure 2 warps upward
ly, thus releasing the latch pin 36 so that a spring
43 (see Figure 3) can swing the trip lever 42 in a
clockwise direction to cause the reset lever 4l to
engage the cross bar l1. Releasing the latch pin
36 permits the right hand end of the vlatch lever
38 to drop and release the latch lug 44 of the trip '
lever 42 for this purpose.
'
To reset the switch after an overload has oc
curred, the reset knob 60 is depressed for pushing
the reset lever 48 downwardly and thereby swing
ing the trip lever 42 against the'action of the
spring 43. The latch lug 44 thereupon engages a
corner 39 of the latch lever 38 to lift the. latch
pin 36 to relatched position.
With the construction shown in Figure 5, the
operation is the same except that instead of the
switch A holding the bell crank 22 in closed cir
cuit position, the switch B is shunted out of the '
circuit as long as the switch A is in closed cir
cuit position.
i
With both forms of the invention, the overload
mechanism |00, |02 and |04 associated with the
switch A is operable to open this switch when the
batch being agitated by the agitator 96 is frozen
to the desired degree, and therefore so stiff that 36
it throws an overload on the motor 88. With
either system it is obvious that the desired con
trol is had including a positive operation of the
refrigerant compressor 84, while the switch A is
closed except when either of the overload devices 40
or the high pressure safety device operates. The
circuit for the motor 86 is then broken.
Some changes may be__ made in the construc
tion and arrangement .of the- parts of my device
without departing from the real spirit and pur
pose of my invention, and it is my intention to
cover by my claims, any'modiñed forms of struc
ture or use of mechanical equivalents, which may
be reasonably included within their scope.
50
'
1. In a refrigerating system, a refrigerant com
pressor, a motor for driving said compressor, an
evaporator cooled by said compressor, a switch
in control of the circuit for said motor and re
sponsive to a predetermined low temperature pro 55
I claim as my invention:
duced by said evaporator to open said circuit, a
freezer compartment associated with said evapo
rator to be chilled "thereby, an agitator in said
By the mechanical connection, consisting of the freezer compartment, a freezer motor for operat
levers '|4 and 80, the link 82, the rock shaft 16 - ing said agitator, means for controlling said
60 and its cam 18, when the switch A is closed, the
freezer motor comprising a second switch in con
bell crank 22 is held in closed circuit position. trol of the circuit therefor and means rendered
Thus the refrigerant compressor 84 will continue operable by said second switch while it is in closed
to operate as long as the switch A is closed re
circuit position for positively retaining said first
gardless of the low temperature of the bulb 30 motor energized beyond said predetermined low 65
tending to move the bell crank 22 to open circuit 'temperature produced by said evaporator.
motor 88 so that it can be energized when a new
batch vof cream is placed in the compartment 34.
position.
f 2. In a refrigerating system, a refrigerant com
It is desirable, however, that the overload and
high pressure safety devices operate to break the
pressor, a motor for _driving said compressor, an
evaporator cooled by said compressor, a switch in
circuit through the motor 86 in the event of - control of the circuit for said motor and respon
70
either an overload in the circuit or excessive high sive to a predetermined low temperature pro
pressure on the high side of the refrigerant com
-duced by said evaporator to open said circuit,
pressor 84.
means in the circuit of said motor and responsive
to an overload therein for opening said circuit, a
`
The link 20 of the switch shown in Figure _1 is,
therefore. connected by a leaf spring 2| to the
freezer compartment Aassociated with said evapo
2,110,0oa
rator to be chilled thereby, an agitator in said
freezercompartment, a freezer motor for operat
ing said agitator, means for controlling said
freezer motor comprising a second switch in con
trol of the circuit therefor and means rendered
operable by said second switch while it is in closed
circuit position'for positively retaining said first
motor energized beyond >its normal cut-olf in re
sponse to said predetermined‘lowf temperature`
produced by said evaporator except upon an
overload in the circuit thereof.
`\ 3. In a refrigerating system, a refrigerant
it
compressor, a motor for driving said compressor,
an evaporator cooled by said compressor, a switch
in control of the circuit for said motor and re
sponsive to a temperature produced by said evap
orator, a freezer compartment associated ,with
said evaporator to be chilled thereby, an agita
-
3
orator, means in the _circuit of said motor and
responsive to an overload therein for opening
said circuit, means responsive to the high side
pressure of said refrigerant compressor for open
ing the circuit of said motor upon excess pressure 5
being generated, a freezer compartment asso
ciated with said evaporator to be chilled thereby, ~
an agitator in said freezer compartment, a freez
er motor for operating said agitator, means for '
controlling said freezer motor comprising a sec- 10
ond switch in control of the circuit therefor and
means rendered operable by said second. switch
while it is in closed circuit position for retaining
said first motor energized regardless of the tem--r
perature produced 'by said evaporator except upon 15
an overload in the circuit thereof and except
upon the generation of excess pressure in the
high side of the refrigerant compressor.
'
tor Vin said freezer compartment, a freezer motor
7. lin a refrigerating system, a refrigerantlcom
20 for operating said agitator, means for controlling pressor, a-motor for, driving said compressor, an
said freezer motor comprising a second switch evaporator cooled by said compressor, a switch in
in control of the circuit therefor, means in the `control of _the circuit for said motor and respon
circuit of said freezer motor and responsive to
an overload therein for opening the freezer mo-tor circuit and means rendered operable by said
second switch while it is in closed circuit position
only for retaining said iirst motor energized re
gardless of the temperature produced by said
evaporator.
_
il. In a refrigerating system, a refrigerant com
pressor, a motor for driving said compressor, an
_ evaporator cooled by said compressor, a switch
sive to a temperature produced by said evapora-.
tor, means responsive to the high side pressure
of said refrigerant compressor for opening the
circuit of said'motor upon excess pressure being
generated, a freezer compartment associated with
said evaporator to be chilled thereby, an agitator'
in said freezer compartment, a freezer motor for
operating said agitator, means -for controlling
said freezer motor comprising a second switch in
control of the circuit therefor, means in the cir
cuit of said freezer motor and responsive to an
in control of the circuit for said motor and reà
sponsive to a temperature produced by said evap Voverload therein for opening the freezer motor
orator, means responsive to the high side pressure circuit and means rendered operable by said sec- _
of said refrigerant compressor for opening the ond switch while it is in closed circuitposition
circuit of said motor upon excess pressure being only for retaining said first motor energized re
generated, a freezer compartment associated gardless of the temperature »produced by said
with said evaporator to be chilled thereby an evaporator except upon the generation of ex
agitator in said freezer compartment, a freezer cess pressure in the high side of the refrigerant ,w
motor for operating said agitator, means for con
trolling said freezer motor comprising a second
d. In a refrigerating system, a refrigerant com
switch in control of the circuit therefor and pressoir, a motor for driving said compressor, an.
means rendered operable by said second switch evaporator cooled by said compressor, a switch
ith while it is in closed circuit position for retaining in control of the circuit for -salti motor and ‘re
said first motor energized regardless of the tem
sponsive to a temperature produced hy said evap
compressor.
perature produced by said evaporator except
_upon the generation of excess pressure in the
high side of the refrigerant compressor.
5. ln a refrigerating system, a refrigerant com
pressor, a motor-for driving said compressor, an
evaporator cooled by said compressor, a switch
in control of the circuit for said motor and re-sponsive to a temperature produced by said evap
orator, means in the circuit of said motor and re
sponsive to an overload therein for opening said
.
_
orator, means in the circuit of said motor and re-"
sponsive to an overload therein for opening said
circuit, means responsive to the high side pres
sure of said refrigerant compressor 'for opening 5@
the circuit of said motor, upon- excess pressure
being generated, a freezer compartment asso
ciated with' said evaporator to be chilled there
by, an agitator in said freezer compartment, a
,freezer motor for operating said agitator, means 55
for controlling said freezer motor comprising a
second switch in control of the circuit therefor,
means in the circuit of said freezer motor and
responsive to an overload therein for opening
the freezer motor circuit, and means rendered to
operable by sai‘d second switch while it is in
circuit, a freezer compartment associated with
said evaporator to be chilled thereby, an agitator
in said freezer compartment, a freezer motor for
operating said agitator, means for controlling
said freezer motor comprising a second switch
in control of the circuit therefor, means in the closed circuit position only for retaining said first
circuit of said freezer motor and responsive to motor energized regardless of the temperature
an overload therein for opening the freezer mo f produced by said evaporator except upon an over
'tor circuit and means rendered operable by said load in the circuit thereof and except upon the oo
second switch while it is in closed circuit posi; generation of excess pressure in the high side of
tion Aonly for retaining said nrst motor energized the refrigerant compressor.
regardless, of the temperature produced by. said
evaporator except upon an overload in the cir
cuit thereof.
’
-
fi. )In a refrigerating system, a refrigerant com
presser, a motor for driving said compressor,(an
evaporator cooled by said compressor, a switch
in control of the circuit for said motor and re
rs sponsive to a temperature produced by
evap»1
El. lin a refrigerating system, a refrigerant com
presser, a motor for driving said compressor, an
evaporator cooled by said compressor, a switch in io
control of the circuit for said motor and respon
sive to a temperature produced by said evapo
rator, a freezer compartment associated with said
evaporator to he chilled thereby, an agitator in
said freezer compartment, a freezer motor for
4
operating said agitator, means for controlling' to a position of obstruction relative to said first
said freezer motor comprising a second switch in
control of the circuit therefor and means ren
switch to retain it in closed circuit position ex
cept upon the generation of excess pressure in
dered operable by said second switch while it is in
closed circuit position for retaining said first
motor energized regardless of the temperature
produced by said evaporator, said means rendered
operable by said second switch comprising an ele
ment movable by said second switch to a position
the high side of the refrigerant compressor.
'10 of obstruction relative to said first switch to re
tain it in closed circuit position.
y
10. In a refrigerating system, a refrigerant
compressor, a motor for driving said compressor,
an evaporator cooled by said compressor, a switch
in control of the circuit for said motor and re
13. In a refrigerating system, a refrigerant
compressor, a motor for driving said compressor.
an evaporator cooled by said compressor, a switch
in control of the circuit for said motor and re
sponsive to a temperature produced by said evap
orator, means inthe circuit of said motor and
responsive to an overload therein for opening said
circuit, a freezer compartment associated with
said evaporator to be chilled thereby, an agitator
in said freezer compartment, a freezer motor for
operating said agitator, means for controlling 15
said freezer motor comprising a second switch in
sponsive to a temperature produced by said evap
orator,vmeans in the circuit of said' motor and re ‘ control of the circuit therefor, means in the cir
sponsive to an overload therein for opening said cuit of said freezer motor and responsive to an
circuit, a freezer compartment associated'with overload therein for opening the freezer motor
20 said evaporator to be chilled thereby, an agitator circuit and means rendered operable by said sec 20
in said freezer compartment, a freezer motor for ond switch while it is in closed circuit position
operating said agitator, means for controlling only for retaining said first motor energized re
said freezer motor comprising a second switch in gardless of the temperature produced by said
evaporator, said means rendered operable by said
control of the circuit therefor and means ren
dered operable by said second switch while it is in second switch comprising an element moved by 25
closed circuit position for retaining said first said second switch to a position of obstruction
motor energized regardless of the temperature relative to said first switch to retain it in closed
produced by said evaporator, said means rendered circuit position except upon an overload in the
operable by said second switch comprising an circuit thereof.
14. In a refrigerating system, a refrigerant 30
80 element moved by said second switch to'a posi
tion of obstruction relative to said first switch to compressor, a motor for driving said compressor,
retain it in closed circuit position except upon an an evaporator cooled by said compressor, a switch
in control of the circuit for said motor and re
overload in the circuit thereof.
11. In a refrigerating system, a refrigerant sponsive to a temperature produced by said evap
35 compressor, a motor for driving said compressor,
an evaporator cooled by said compressor, a switch
in control of the circuit for said motor and re
sponsive to a temperature produced by said evap
orator, a freezer compartment associated with
said evaporator to be chilled thereby, an agitator
in said freezer compartment, a freezer motor
for operating said agitator, means for controlling
said freezer motor comprising a second switch ln
control of the circuit therefor, means in the cir
cuit of said freezer motor and responsive to an
overload therein for opening the freezer motor
circuit and means rendered operable by said sec
ond switch while it is in closed circuit position
only for retaining said first motor energized re
50 gardless of the temperature produced by said
evaporator, said means rendered operable by said
second switch comprising an element moved by
said second switch to a position of obstruction
relative to said ñr`st switch to retain it in closed
55
circuit position.
`
‘
12. In a refrigerating system, a refrigerant
compressor, a motor for driving said compressor,
an evaporator cooled by said compressor, a switch
in control of the circuit for said motor and ren
60 sponsive to
a temperature produced by said
evaporator, means responsive to the high side
pressure of said refrigerant compressor for open
ing the circuit of said motor upon excess pressure
being generated, a freezer compartment associ
ated with said evaporator to be chilled thereby,
an agitator in said freezer compartment, a freezer
motor for operating said agitator, means for con
trolling said freezer motor comprising a- second
switch in control of the circuit therefor and
means rendered operable by said second switch
while it is in closed circuit position for retaining
said first motor energized regardless of the tem
perature produced by said evaporator, said means
rendered operable by said second switch com
76 prising an element moved by said second switch
orator, means in the circuit of said motor and 35
responsive to an overload therein for opening said '
circuit, means responsive to the high side pres
sure of said refrigerant compressor for opening
the circuit ofsaid motor upon excess pressure be
ing generated, a freezer compartment associated 40
with said evaporator to be chilled thereby, an
agitator in said freezer compartment, a freezer
motor for operating said agitator, means for con
trolling said freezer motor comprising a second
Switch in control vof the circuit therefor and
means rendered operable by said second switch
while it is in closed circuit position for retaining
said first motor energized regardless of the tem
perature produced by said evaporator, said means
rendered operable by said second switch compris
50
ing an element moved by said second switch to a
position of obstruction relative to said ñrst switch
to retain it in closed circuit position, except upon
an overload in the circuit thereof and except upon
the generation of excess pressure in the high side
of the refrigerant compressor.
15. In a refrigerating system, a refrigerant
compressor, a motor for driving said compressor,
an evaporator cooled by said compressor, a
switch in control of the circuit for said motor 60
and responsive to a temperature produced by
said evaporator, means responsive to the high
side pressure of said refrigerant compressor for
opening the circuit of said motor upon excess
pressure being generated, a freezer compartment
associated with said evaporator to `be chilled
thereby, an agitator in said freezer compartment,
a freezer motorl for operating said agitator,
means for controlling said freezer motor com
prising a second switch in control of the cir
cuit therefor, means in the circuit' of said freezer
motor and responsive to an overload vtherein
for opening the freezer motor circuit and means
rendered operable by said second switch while
it is in closed circuit position only for retaining 75
2,116,002
said ñrst motor energized regardless of the tem
perature produced by said evaporator, said
means rendered operable by said second switch
comprising an element moved by said second
switch to a position of obstruction relative to
said first switch to retain it in closed circuit
position except upon the generation of excess
pressure in the high side of the refrigerant
compressor.
10
‘
y
~
16. In a refrigerating system, a refrigerant
. compressor, a motor for driving said compressor,
an evaporator cooled by said compressor, a
switch in'\` control of the circuit for said motor
and responsive to a temperature produced by
5
pressure of said refrigerant compressor for open
ing the circuit of said motor upon excess pres
sure being generated, a freezer compartment as- Y
sociated with said evaporator to be chilled there
by, an agitator in said freezer compartment, aA 5
freezer motor for operating said agitator, -means
for controlling said freezer motor comprising a
second switch in control of the circuit therefor
and means rendered operable by said second
switch while it is in closed circuit position for re- 10
taining said first motor energized regardless of
the temperature produced by said evaporator ex
cept upon the generation of excess pressure in
the high side of the refrigerant compressor, said
15 said evaporator, a freezer compartment asso-v
means rendered operable by said second switch l5
ciated with said evaporator to be chilled there
comprising a shunt circuit through said second
by an agitator in said freezer compartment, a -switch and shunting the‘ñrst switch.
freezer motor for operating said agitator, means'
20. In a, refrigerating system, a refrigerant
for controlling said freezer motor comprising a ` compressor, a motor for driving said compressor,
20 second switch in control of .the circuit therefor
an evaporator cooled by said compressor, a switch 20
and means rendered operable by said second in control of the circuit for said motor and re
switch while it is in closed circuit position for i sponsive to a temperature produced by said evap
retaining said first motor energized regardless
of the temperature produced by said evaporator,
said means rendered operable by said second
switch comprising a shunt circuit through said
_ second switch and shunting the iirst switch.
i7. lin a refrigerating system, a refrigerant
compressor, a motor ior driving said compressor,
30' an evaporator cooled by Asaid' compressor, a
switch in control of thecircuit for said motor
and responsive to a temperature produced by
said evaporator, me ns in the circuit oi said mo
tor and responsa to an overload therein for
orator, means in the circuit of said motor and
responsive to an overload therein for opening
said circuit, a freezer compartment associated 25
with said evaporator to _be chilled thereby, an
agitator in said freezer compartment, a freezer
motor for operating said agitator, means for
controlling said freezer motor comprising a sec
ond switch in control of the circuit therefor, 30
means in the circuit of said freezer motor and
responsive to an overload therein for opening
the freezer motor circuit and means rendered
operablel by said second switch while it is in
35/ opening said circuit, a freezer compartmentas- „
closed circuit position only for retaining said S5
sociated with said evaporator to be chilled there- " iirst motor energized regardless of the tempera
(s
by an agitator in said freezer compartment, a
freezer motor for operating said agitator, means
for controlling said freezer motor comprising
a second switch in control of the circuit there
for and means rendered operable by said second
switch while it is in closed circuit position for
retaining said first motor energized regardless
of the temperature produced by said evaporator
dit except upon an overload in the ci'rcuit thereof,
ture produced by said evaporator except upon
an overload in the circuit thereof, said means
rendered operable by said second switch com
prising a shunt circuit through said second switch 40
and shunting the ñrst switch.
21. In a refrigerating system, a refrigerant
compressor, a motor for driving said compressor, _
an evaporator cooled by said compressor, a switch
in control of the circuit for said motor and re- 45
said means rendered operable by said second
switch comprising a shunt circuit through said
sponsive to a temperature produced by said evap
second stch and shunting the ñrst switch.
responsive 'to an overload therein ?for openingr
said circuit, means responsive to the high side
i8. lin a reirigerating system, a refrigerant
btt compressor, a motor tor driving said compressor,
an evaporator cooled by said compressor, a
switch in control or the circuit for said motor
and responsive to a temperature produced by
said evaporator, a freezer compartment asso
dd ciated with. said evaporator to be chilled thereby,
an agitator in `said freezer compartment, a
rreezer motor for operating said agitator, means
tor controlling said freezer ymotor comprising
.a second switch in control of the circuit there
titi tor, means in the circuit of said freezer motor
and responsive to an overload therein for open)
ing the freezer motor circuit and means rendered
operable by 'said second switch while it is in
closed circuit position only _tor retaining said
' ili‘st motor enerd regardless of the tempera
orator, means in the circuit of said motor and
pressure of said refrigerant compressor for open- 50
ing the circuit of said motor upon 4excess pres
sure being generated, a freezer compartment as
sociated with said evaporator to be chilled there
by, an agitator in said freezer compartment, a
freezer motor for operating said agitator, means 5a
for controlling said freezer motor comprising la
second switch in control -of the circuit therefor
and means rendered operable by said second
switch 'while it is in closed circuit position ,for
retaining said ñrst motor energized regardless o0
of the temperature produced by'said evaporator
except upon an overload yin the circuit thereoi`
and except upon the generation of excess pres
sure in the high side of the refrigerant com'
pressor, said means rendered operable by said c5
second switch comprising a shunt circuit through
said second switch and shunting the iirst switch.
22. In a refrigerating system, a refrigerant
compressor, a motor for driving said compressor,
ture produced by said evaporator, said means
rendered operable by said' second switch com
pulsing a shunt circuit through said second
switch and shunting the first switch.
iii, lil. lin a refrigerating system, a refrigerant ,i an evaporator cooled by said compressor, a switch 7o compressor, a motor for driving said compressor,
an evaporator cooled by said compressor, a switch
in control of the circuit for said motor and re
sponsive ‘ to a temperature produced» by said
evaporator, means responsive to the thigh side
in control of the circuit for said motor and re
sponsive to a temperature'produced by said evap- y
orator, means responsive to the high side pres
sure of -said refrigerant compressor for opening
the circuit oi” said motor upon excess pressure 'y
6
2,116,002
being generated, a freezer compartment associ ' circuit position only for retaining said iirst mo
ated with said evaporator to be chilled thereby, tor energized regardless of the‘temperature pro
an agitator in said freezer compartment, a. freezer duced by said evaporator except upon the gen
motor for operating said agitator, means for eration of excess pressure in the high side of the
controlling said freezer motor comprising a sec-v refrigerant compressor. said means rendered op
ond switch in control of the circuit therefor, erable by said second switch comprising a shunt
means in the circuit of said freezer motor and circuit through said second switch and shunt
responsive to an overload therein for opening the ing the ñrst switch.
freezer motor circuit and means rendered oper
« able by said second switch while it is in closed
BURTON E. SHAW.
10
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