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Патент USA US2411295

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Nov. 19, 1946.
E, sABALLUs ETAL
2,411,295 `
CONTROL MECHANISM
Filed Jan. 5, 1944
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Nov. 19, 1946.
E. sABALLUs ET AL
2,411,295
CONTROL MECHANI SM
' Filed Jan. 5, 1944
3 Sheets-Sheet 2
Nov. 19, 1946,
2,411,295
E. SABALLUS ET AL
CONTROL- MECHANI SM
Fil/ed Jan. 5, .1944
_ 3 Sheets-Sheet 3
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INVENToRs.
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BY darl W. I' c
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Patented Nov. 19, 1946
2,411,295
UNITED STATES PATENT UFFICE
2,411,295
CONTROL MECHANISM
Erwin Saballus and Carl W. Fischer, Chicago,
AIll., assignors to The Powers Regulator Com-v
pany, Chicago, Ill., a corporation of Illinois
Application January 5, 1944, Serial No. 517,026
`
1
'
13 Claims.
(C1. 236-87)
2
This invention pertains l'to «a thermostat and,
parts, but all bending or lost motion in the parts
more particularly, to an air stream thermostat
is eliminated.
for use in controlling the temperature of air de
Another object of the invention is to provide
livered t0 an enclosure,
a thermostat which can be made as a very small
In the old type of air stream thermostat, there Ul unit, which is `advantageous in that in some in
is a rlxed relation between the change of tem
stallations there is not much room for the mount
perature and the `change in control pressure (this
ing ofthe device.
ratio being called sensitivity), for example, for a
Another object of the invention is to provide >a
one degree change Yin temperature there is a set,
thermostat wherein when there is no temperature
vor fixed change in the pressure which cannot be lO change no air is being used from the compressor,
Varied for that degree without changing the con
thereby eliminating noise and the wear and tear
struction of the thermostat. In other words,
on the compressor.
after the installation of the device an adjustment
Another object of the invention is to provide Va
cannot be made in the ñeld. This is, of course,
thermostat wherein the points of application of
very disadvantageous, because the control cannot
the pressure to the valves or other control parts,
then be accurate. The temperature cannot be
due to temperature change, is in line with the op
steadily maintained and, consequently, va fluctu
erating member (Invar rod) whereby any change
ation in temperature occurs.
in `temperature causes »an immediate operation of
>In devices of this character the control member
the control valves so that there will always be a
gives only very small movements, that is, for a 20 response without delay for small temperature
one degree change the `control member, for ex
changes.
ample, may move only one and one half ten thou
Another object of the invention is to provide
sandths of an inch. The old devices made use of
a control operating through a lever, a linkage, _or
-a -thermostat which prevents cycling. For exam
a yoke, and, consequently, the control valves did
not operate for a one degree change in tempera
' the steam valve which is controlled by the ther
mostat, so that the steam coil will not be over
ture, as lost motion occurred in the linkage -or
lever, lor bending occurred in the yoke. In the old
device a lever Vwas desirable to operate the valve,
as otherwise enough motion could _not be attained
to close the valve, as the resilience of the lever
was ñxed, the sensitivity Was fixed, whereas in the
present device an object is to provide adjusting
means which increases the sensitivity.
Another object of the invention is to provide
means whereby the sensitivity of the thermostat
may be adjusted after installation without having
ple, there will not be ‘large or many changes in
heated and underheated in the air supply duct,
which ‘happens where a thermostat of fixed sensi
tivity is used. The increased sensitivity of the
present device and the fact that it can be ad
justed prevents this cycling from occurring.
VWith these _and various other objects in view,
the invention may consist of certain novel fea
tures of construction and operation -as will be
more fully described and particularly pointed out
‘in the speciñcation, drawings and claims append
ed hereto.`
^
to change the construction of the thermostat.
In the drawings, which illustrate an embodi
Another object ofthe invention is to provide a 40 ment of the device and wherein like reference
thermostat wherein the range of sensitivity is
characters are used to designate like parts
adjustable.
Figure 1 is a fragmentary sectional elevation
Another object of the invention is to provide a
through a form of duct thermostat embodying
thermostat which is inexpensive to make and can
the invention;
be readily substituted `for the old form of .thermo
Figure 2 is a plan View, partly in section, of the
stat in existing installations.
control
end lof the duct thermostat, the same
_Another object of the invention is to provide
being taken substantially inthe plane as indicat
a thermostat utilizing an Invar or like rod in the
ed by the line 2-2 of Figure 1;
control means, which rod causes actuation of the
Figure 3 is a plan view, partly in section, of the
control valves.
control end of the ,duct thermostat showing the
`Another object of the invention is to provide a
throttlíng' spring, the view being taken substan
thermostat wherein the operation is only by
tially in the plane as indicated by the line 3--3 of
compression or tension, that is, all beams, levers
Fig-ure 1;
`
and yokes are omitted so that not only can it be
Figure 4 is an enlarged sectional elevation of
_made 4more cheaply and accurately, and with less 55 the supply and exhaust valve assembly;
¿411,895
3
and the dial 82 is ñxedly mounted to the bushing
and cap. In the construction shown the calibra
tions indicated on the dial are each for 5° F. and
Figure 5 is a top plan view of the throttling
spring assembly;
Figure 6 is a sectional elevation taken substan
tially in the plane as indicated in line 6_6 of
Figure 5;
Ch
Figure 7 is an end elevation, looking toward the
' by loosening screw 83 the position of the dial
and member 68 can be changed so that as high as
500° F. and as low as _100° F. can be operative
to affect the thermostat. The dial calibrations,
which may be marked numerically, are read
against the fixed indicator member 84 iixedly
one form of installation of the thermostat shown lí supported on the ring 18 as at 86.
The dial is provided with the shoulders 88 and
in Figure 1;
'
Figure 9 is an elevation of a room thermostat _ y98 adapted to be moved to engage the stop 92'
which may be conveniently provided on the
used in the form of installation (and others) il
square headed screw 94. When the dial is moved
lustrated in Figure 8;
’
'
Y between the shoulders, threads 51 cause the stem
Figure 10 isA an enlarged sectional side >eleva- i
56 to move with respect to member 24 and conse
tion of the room thermostat shown in Figure 9;
top, of the throttling spring assembly illustrated
in Figure 5;
Figure 8 is a diagrammatic representation of
and_
,
.
,
Figure 11 is an enlarged sectional elevation> of I
the valve control or operating member shown in
Figure 8.
Referring ñrst of all more particularly to the
duct thermostatic device illustrated in Figures
quently to cause bushing 68 to move toward the
right or left as viewed in Figure 1. This then de
termines how far bushing 68 must be moved be
fore it affects the throttling spring assembly 96.
The square headed screw 94 is provided with
the throttling spring assembly 86 adapted to be
rotated thereby. The throttling spring assembly
is provided with the spring holder 98 which is
1 'to '1j inclusive', the device comprises the base
mounting I8 threaded as at I2 for the reception
ofcorresponding threads of the securing flange 25 riveted or otherwise secured as at |88 to the tops
of the top and bottom throttling springs |82 and
I4, said ñange being adapted to be fastened as at
|84, said throttling springs being provided with
I6 to one wall of the duct I8. The base mounting
the aligned cut-out portions |86 embracing the
is provided with the temperature sensitive (cop
operating stem 56 whereby the springs may be
per) tube 28 which extends into the duct and is
provided with the plug 22 secured to said tube 30 readily moved between two positions by the
screw 94.
land to the inner Invar rod 24 as at 26. A rein
The dial bushing 68 is provided with the boss
forcing tube 28 may be provided in the tube 28
adjacent the base mounting.
The tube 28 is
made-pressure tight and the rod 24 is provided
vwith the guide or bearing portion 38 extending
„through a complementary guide and spring seat
32 provided in the base mounting.
_
The base mounting is provided with a supply
fitting 34 (S) which is adapted to be connected
toa Vsource of pressure supply and communicates
|88 which overlies the spring |82 transversely
of the slot |86 and nut 18 overlies the slot |06
vof spring |84, whereby movement of the bushing
68 toward the right as viewed in Figure 1, causes
deflection of the springs, or in the event the
spring assembly has been rotated in a counter
clockwise direction as Viewed in Figure l, so that
the boss _|88 and nut 18 overlies the top or solid
pressure fitting 48 (R) adapted to be connected
part of the springs and holder, compression of
the top of the assembly is caused. When the
spring assembly is rotated counter-clockwise to
the solid position, the laction of the device be
to control means such as a steam valve (Figure
~ cornes positive, whereas when it is rotated in a
with a channel or passage 36 which communi
cates with the supply valve chamber 38. 'I‘he
base mounting is also provided with a control
_11), and said ñtting communicates with the
clockwise direction as viewed in Figure 2, the
channel Vor passage 42 which in turn communi
action becomes gradual.
A cover l I8 may be ap
plied to the base mounting, said cover not being
’air tight but preventing unauthorized tempering
ply and- exhaust valve body 46 is threaded as at
48 to the base mounting and provides a supply 50 with the setting members and also preventing
dirt and grease from entering the mechanism.
yvalve seat 49 in the chamber 38. The supply
In Figure 8 there is shown, more or less dia
valve 58 is urged toward seated position by means
grammatically, an application of the duct ther
of a spring 52 disposed in said chamber 3‘8, the
mostat described. In this application the wall or
’spring being seated at one end at the seat 32 and
room thermostat |38 (Figures 8, 9 and 10) is
at the other end on the spring seat 54 which
used to control the temperature of a space, for
floats or is loosely mounted on the operating stem
example a room, which receives its fresh air
56 which is threadably secured as at 51 to the
through duct |I2. Room thermostat |38 is nor
bearing portion 30 at its inner end, its outer end
mally set, for example at 75° F., and the duct
-being secured as at 58 to the dial bushing 68.
A resilient seal washer 62 is interposed between 60 thermostat assembly above described is set at 65°
F. to prevent air colder than this temperature to
the' spring seat 54 and the valve 58 and the
enter the room and cause drafts. In Figure 8 a
spring 52 tends to cause the seal washer to seize
duct |I2 is shown wherein a blower ||4 is
fthe stem 56 whereby leakage of the air in cham
mounted propelling the air in the direction of
ber 38 around the stem is prevented. The supply
_cates with the diaphragm chamber 44. The sup
valve 58 is provided with an exhaust valve 64’ 65 the arrow, that is, to the right as viewed in said
ñgure. Normally open steam control valve |I6
is connected through piping ||8 to'a steam inlet
to seat on the exhaust valve seat 66 of the ex
movable with the supply valve and being adapted
and is connected to the heating coils |28 mounted
haust valve body 68. Said exhaust valve body is
in said duct, the steam flowing in the direction
loosely contained within the head of the supply
valve body 46 and is secured as by theexhaust 70 of the arrow.
_ AThe steam control valve IIS is part of the
valve nut 18 to the diaphragm plate 12 and the
steam control valve assembly 39 shown in Figure
diaphragm 14, th'e diaphragm 14 being secured
11„_and the valve comprises the valve body I8|
as at 16 to the base mounting I8 through the dia
phragm ring 18.
`
The dial-bushing’68`is 'provided with a cap’88
provided with the seat |83 for valve dise |85, which
75 control flow from pipe I|8 connected at |81, to
5
2,411,295'
6
-coils y|29«¢':onnected at |09. Valve `stem l|lïconnected to the disc |95 extends through stuffing
mostat -|3|J`rgoes below 75? F., for example, due -to
the cooling of Vcoils |20 as they are cut off from
the source of heat supply, the supply val-ve of the
box‘l i3 and is Yoperated by the Sylphon or bellows
‘| |15 of the control member or motor |24. Spring
-|1|1 urges thefdisc |95 toward open position and
room thermostat-closes inasmuch as the disc |49
will contract permitting the assembly |55 to move
the bellows is Aenclosed in casing H9 which is
toward the left as viewed i-n Figure 1:0, whereupon
adapted ~to `be supplied with `an under pressure
thespring |8-| will close the supply valve |19. ‘The
from pipe |25 which is connected as at -|2| t0 the
pressure will then drop at the bellows H5, and
casing support ~| 23 provided on the valve casing.
the valve disc |05 will open, due to >the resiliency
‘ Beyond `the steam coils |20 the duct thermo 10 of the bellows | |5 and the spring «| l1.
stat‘assembly above described-'is'mounted as `at
It is understood, of course, that the control at
|22, theflange i4 being secured to the duct-and
this duct thermostat is inoperative for so long as
the `tube 29 being `disposi-2d in said duct. The boss
the air temperature in the duct is above 65° F. If
49 ofthe base «mounting is connected to the valve
the air temperature in the duct is above 65° F., an
control or control motor |24 >by `means of the 15 expansion of the outer tube 29 occurs. Then, in
piping |25 and the boss 34 is >connected through
asmuch as the rod 24 does not expand, it is moved
the piping `|23 to the wall-thermostat 'l 39, the wall
toward the right as viewed in Figure l causing
thermostat being `connected through the piping
the inlet valve 59 to be opened against the spring
Ul
4| 32 to the sourceof pressure supply (which is nor
mally fifteen pounds).
` 20
’The room thermostat |39 is >provided with the
usual controls whereby the piping |32 may be se
lectively connected or disconnected from the pip
ing |28, vdepending on the setting of said wall
thermostat. In -Figures 9 and 10 the room thermo
stat |39 is Villustrated comprising the base «I 33 pro
and consequently diaphragm 14 and valve body
68 will be moved toward the right. Inasmuch as
the valve -50 is open, air under pressure will be
permitted to ilow from the source of supply
25 through the passage 38 into the supply valve
vided with the temperature adjustment member
>|35 adapted to be rotated for adjustment and pro
vided with the index |31 readable against the scale
|39, The member |35 is -provided with the shaft 30
~| 4| threadedA into the base |33 so that rotation
of the shaft also causes reciprocation thereof.
The disc lever |43 ineiîect is pivoted to the base
52 »but the exhaust valve 94 will remain closed as
he dial bushing 99 will be moved toward the -right
chamber 33, past the valve 59 into the diaphragm
chamber 44, tending to move the diaphragm 14
toward the left as viewed in Figure 1. Air under
pressure will also lflow through the passage 42 to
the piping |25 to tend to close the valve HG by
applying pressure to the control motor |24.
Air under pressure will be supplied to the dia
phragm chamber 44 until sufficient pressure ‘is
built -up to either deflect the springs |92 and |94
35 or to compress slightly the solid top of the spring
and the lower leg |45 is adapted to be moved by
the shaft |4| thereby moving the upper leg |41
which is adapted to engage and affect the ex
assembly, depending upon the setting of the throt
pansíon of the vapor disc |49. The harmonizing
tling spring assembly. When suñìcient pressure
screw |5| determines the eilective pivot of the
has been supplied to deñect said spring members
lever l|43 b_y movinglever |43 slightly. Spring |53
or to compress the top of the assembly, the nut 19
urges the leg |41 toward the right as viewed in 40 will be moved toward the left as viewed in Figure 1,
Figure 10 and consequently tends to compress the
permitting the valve 59 to close. Should then a
disc |49 between the leg |41 and the exhaust port
drop in temperature occur in the duct to cause the
seat assembly |55. Assembly |55 is provided
tube 29 to contract, the rod 24 will be moved to
with the diaphragm |51 secured to extension |59
ward the left as viewed in Figure 1 and the bush
of the base and the assembly is provided with the 45 ing 59 will be moved toward the left. Movement
exhaust valve seat 16| and exhaust outlet |63 to
of the bushing toward the left will permit the
the atmosphere. -Exhaust valve |65 is adapted
spring assembly 99 l‘to move toward its normal
to control the outlet 4| 93 and is urged toward open
position whereupon air pressure on the diaphragm
position by spring |51. Diaphragm |51 with the
14 will move it toward the left to open the éX
extension |59 forms an exhaust valve chamber |69 50 haust valve at the seat 66 whereupon the pres
communicating with passage i 1| which is con
sure in the diaphragm chamber will bleed out
nected to pipe |28 (Figure 8). Extension |59 is
along the operating stem inasmuch as there is a
also provided with the supply valve seat |13 inter
space between said stem and the exhaust valve
posed between supply valve chamber |15 and
body as shown at |34. Inasmuch as the pressure
passage |11 communicating with chamber |69. 55 is bled to the atmosphere (within the cover H9)
Supply valve |19 controls the seat |13 and is urged
the pressure will drop in the pipe |26 to control
toward closed position by spring l8| but said
member |24 and valve ||6 will open, whereupon
valve is provided with extension |83 contacting
steam will be supplied from the inlet to the coil
Valve |55 whereby when the disc |49 moves dia
|29 causing the temperature of the air in the duct
phragm |51 toward the right in Figure l0, valve 60 to Abe raised. Raising the temperature will then
|19 is opened. The supply chamber |15 com
cause the tube 29 to expand moving the rod 24
municates with passage |85 which in turn is con
tothe right as viewed in Figure l `to again open
nected t'o the supply line |32 (Figure 8).
the valve 50 and close ‘the valve 54, the diaphragm
Thus assuming that the room thermostat |39
moving toward its normal position through nut 19.
(Figures 9 and 10) is set‘for 75° F. and the duct 65 Air under pressure will then be supplied to the
thermostat |22 is set for 65° F., if the tempera
control vmember |24 to move the valve | | 9 toward
ture at the room thermostat |30 rises above `'75°
the closed position.
Ffthepressure line |32 is connected to line |28 as
The throttling spring assembly 96 is the means
the vapor disc |49 will expand, moving the ex
by which the sensitivity of the device is varied.
haust valve seat assembly |55 toward the right, 70 Further, it is noted that the action to .deflect
as viewed in Figure 10, causing the valve |65 to
the `springs |92 and |04, or to compress the top
open the valve |19. Line |28 will be connected
of the spring assembly, is in a straight line,
to'line |26, causing‘the .airpressure to tend to col
there being no intermediate levers or other mech
lapse, the bellows ||5 moving the valve disc |95 to
anism so that there is no lost motion or deflec
closedposition. *If the; temperature. at roomfther 75 tion 1 of . any zmember :which cannot `be controlled.
2,411,295.
opening thereof, said exhaust valve body having
By rotating the adjusting screw 94 in a clock
wise direction, toward “G,” the boss |08 is moved
away from the top of the assembly, that is, is
moved toward the position where the cantilever
beam is the longest, thus the deflection of the
springs is the greatest.
Assuming a balanced condition of the control,
a bore therethrough communicating with the at
mosphere when the exhaust valve is open whereby
said diaphragm chamber is connected to at
mosphere when said exhaust valve is open, said
base mounting having a supply ñtting communi
eating with said supply valve chamber and a
control fitting communicating with said dia
namely, where the valves 50 and 64 are closed
and assuming a rise in temperature to open the
phragm chamber, a temperature sensitive ex
pansible tube connected at one end tosaid base
mounting and closed at the opposite end, a non
valve 50 permitting pressure to be supplied to
the diaphragm chamber 44, in the event the least
sensitivity is desired, the screw 94 is moved in
a clockwise direction where the boss |08 is at the
lowest point of the slots |06. This establishes
the condition where there is less pressure change
needed in the chamber 44 to close the supply valve
50, that is, the deflection of the members |02
and |04 arethe greatest. In this position of the
duct thermostat there is the shortest amount
oi travel of the control motor |24 for any given
change of temperature. ThisI minimizes hunt
expansible member disposed in said tube and
connected at one end to the closed end of said
tube, an operating stem connected to the other
15 end of said non-expansible member for relative
movement with respect thereto, said stem ex
tending through said base mounting, said valves
and said diaphragm, and being provided with a
bushing secured to said stem, and means of`
varying
ñexibility interposed between said dia
20
phragm and bushing and movable with respect
ing, or cycling as would be caused by that con
dition where there is an appreciable amount of
to said bushing for selectively and variably re
sisting movement of said bushing by said tube.
2. In a thermostat, the combination of a base
time lag between the time the valve position is
changed and the time the resultant temperature 25 mounting having a diaphragm chamber and a
supply chamber spaced from and communicat
is felt at the thermostat tube 20.
ing with said diaphragm chamber, said mount
Movement of the screw 94 in a counter-clock
ing having a supply passage to said supply cham
wise direction where the boss |08 is at the top
ber and said mounting having a control passage
point of the slots |06, that is, overlying the solid
portion of the assembly establishes the condition 30 to said diaphragm chamber, a supply valve for
controlling supply from said supply chamber to
of greatest sensitivity, that is, more pressure
change is needed in the chamber 44 to close the
supply valve 50, therefore, there will be longer
travel of the operating member |24. This set
said diaphragm chamber, resilient means for
urging said valve to closed position, a diaphragm
closing said diaphragm chainbpr, an exhaust
ting is valuable where there are great tempera 35 valve member communicating with said dia
phragm chamber and atmosphere, said exhaust
ture changes at the entrance of the duct ||2
valve member having an exhaust valve seat, an
but a small time lag exists between the time
exhaust valve movable with said supply valve
the valve is changed and the result of the change
and opening and closing said exhaust valve seat
is felt at tube 20.
Intermediate positions of the assembly of the 40 for controlling exhaust from said diaphragm
chamber to atmosphere, and control means for
throttling spring assembly vary the pressure con
controlling operation of said diaphragm and ex->
ditions necessary in the diaphragm chamber 44
haust valve, said control means including a tem
to close the exhaust valve 50, or in `other words,
perature sensitive expansible member secured
intermediate sensitivities are obtained between
the two extreme positions of the spring assembly; 45 to said base mounting, a non-expansible member movable by the expansible member, means of
It is to be understood that we do not wish to be
selective and variable resistance for resisting ex
limited by the exact embodiments of the device
pansion of said vexpansible member, and means
shown, which are merely by way of illustration
carried by said non-expansible member adjust
an'd not limitation, as various and other forms
able to vary the compression between said last
of the device will, of course, be apparent to those
named means and said means of variable resist
skilled in the art without departing from the
ance for varying the sensitivity of said thermo
spirit of the invention or the scope of the claims.
We claim:
'
1. In a thermostat, the combination of a base
mounting having a diaphragm chamber, a dia
phragm closing one end of said chamber, said
base mounting having a supply valve chamber
spaced from and communicating with said dia
phragm chamber, a supply and exhaust valve
body in said mounting interposed between said 60
chambers and having a bore therethrough
through which said chambers are in communica
tion, said exhaust valve body having a supply
valve seat in said supply valve chamber, a supply
valve disposed in said supply valve chamber,
resilient means urging said valve to seated posi
tion, whereby when said valve is seated com
munication between said chambers is cut off, an
exhaust valve connected with said supply valve
for movement therewith, an exhaust valve body
movable with said diaphragm and providing a
seat for said exhaust valve, movement of the
diaphragm toward the exhaust valve causing»
closing of the'exhaust valve, movement of the
diaphragm away from the exhaust valve causing 75
stat.
»
3. In a thermostat, the combination of a base
mounting having a diaphragm chamber and a
supply chamber spaced from and communicating
with said diaphragm chamber, said mounting
having a supply passage to said supply chamber
and said mounting having a control passage to
said diaphragm chamber, a supply valve for con
trolling supply from said supply chamber to said
diaphragm chamber, resilient means for urging
said valve to closed position, a diaphragm closing
said diaphragm chamber, an exhaust valve seat
member movable with said diaphragm and com
municating with said diaphragm chamber and at
mosphere, said exhaust valve seat member having
an exhaust valve seat, an exhaust valve adapted
to seat on said exhaust valve seat for controlling
exhaust from said diaphragm chamber to atmos
phere, and control ‘means for controlling opera
tion of said ~diaphragm'and exhaust valve, said
control'me'ans including' a temperature sensitive
expansible member secured to said base mounting,
a non-expansible member movable by the ‘expan
2,411,295
sible member,- mea-ns of `select-ive and variable re
sistarlce for resisting expansionof said expansible
member, and means `carried by said non-ex
pansible member adjustable to vary the com
pression between said last named means and said
means of variable resistance for varying >the `sen
sitivity `of said thermostat.
4. In a thermostat, the combination of a base
mounting having a diaphragm chamber and a
1'0
silient means for urging said valve to closed po
sition, a diaphragm closing said diaphragm cham
ber, an exhaust valve member communicating
with said diaphragm chamber and atmosphere,
said exhausting valve member having an exhaust
valve seat, an exhaust valve movable with said
supply valve for controlling exhaust from said ,
diaphragm chamber to atmosphere, and control
means for controlling operation of said dia
supply chamber spaced from and communicating
with said diaphragm chamber, said mounting
having a supply passage to said supply chamber
phragm and exhaust valve, said control means
including a temperature sensitive expansible
and said mounting having a control passage to
said diaphragm chamber, a supply valve for con
expansible member movable by the expansible
member `secured to said base mounting, a non
member, means of selective and variable resist
trolling supply from said supply chamber to said 15 ance for resisting expansion of said expansible
diaphragm chamber, resilient means for >urging
member, means carried by said non-expansible
said valve to closed position, a diaphragm closing
member adjustable and operative in alignment
said diaphragm chamber, an exhaust valve seat
member movable with said diaphragm and com
municating with said diaphragm chamber and
atmosphere, said exhaust valve seat member hav
ing an exhaust valve seat, an exhaust valve mov
with said non-expansible member and said valves
to vary the compression between said last named
means and said means of variable resistance for
varying the sensitivity of said thermostat,
able with said supply valve and adapted lto seat
7. In a thermostat, the combination of a base
mounting having a diaphragm chamber and a
on said exhaust valve seat for controlling ex
supplyrchamber spaced from and communicating
haust from said diaphragm chamber to atmos 25 with said diaphragm chamber, said mounting
phere, and control means for controlling opera
having a supply passage to said supply chamber
tion of said diaphragm and exhaust valve, said
and said mounting having a control passage to
control means including a temperature sensitive
said diaphragm chamber, a supply valve for con
expansible member secured to said base mount
trolling supply from said supply chamber to said
ing, a non-expansible member movable by the
diaphragm chamber, resilient means for urging
expansible member, means of selective and
said valve to closed position, a diaphragm closing
variable resistance for resisting expansion of said
said diaphragm chamber, an exhaust valve seat
expansible member, and means carried by said
member movable with said diaphragm and com
non-expansible member adjustable to vary the
municating with said diaphragm chamber and
compression between said last named means and
‘said means of variable resistance for varying the
sensitivity of said thermostat.
5. In a thermostat. the combination of a base
mounting having a diaphragm chamber and a
supply chamber spaced from and communicating
with said diaphragm chamber, said mounting
having a supply passage to said supply chamber
Y atmosphere, said exhaust valve seat member hav
ing an exhaust valve seat, an exhaust valve
adapted to seat on said exhaust valve seat .for
controlling exhaust from said diaphragm cham
ber to atmosphere, control means for controlling
operation of said diaphragm and exhaust valve,
said control means including a temperature sen
ber, a supply valve for controlling supply from
sitive expansible member secured to said base
mounting, a non-expansible member movable by
the expansible member, means of selective and
said supply chamber to said diaphragm chamber,
variable resistance for resisting expansion of said
and a control passage to said diaphragm cham
resilient means for urging said valve to closed -
expansible member and means carried by said
position, a diaphragm closing said diaphragm
non-‘expansible member adjustable and operative
chamber, an exhaust valve seat member com
in alignment with said non-expansible member
and said valves to vary the compression between
said last named means and said means of variable
resistance for varying the sensitivity of said ther
mostat.
municating with said diaphragm chamber and
atmosphere'said exhaust valve seat member hav
ing an exhaust valve seat. an exhaust valve for
said exhaust valve se'at for controlling exhaust
from said diaphragm chamber to atmosphere,
control means for controlling operation of said
diaphragm and’ exhaust valve,v said control means
including a temperature sensitive expansible
member secured to said base mounting, a non
expansible member' movable by the e'xpan'sibl‘e
member, means of selective and variable resist
ance for resisting expansion of said expansibl'e
member, and means carried by said non-ex
pansible member adjustable and operative in'
alignment with said non-expansible member and
said valves to vary the compression between .said
last named means and said means of variable re
sistance for varying the sensitivity of said ther
mostat.
6. In a thermostat, the combination of a base
mounting having a diaphragm chamber and a
8. In a thermostat, the combination of a base
mounting having a diaphragm chamber and a
supply chamber spaced from and communicating
with said diaphragm chamber, said mounting
having a supply passage to said supply chamber
and a control passage to said diaphragm cham
ber, a supply valve for controlling supply from
said supply chamber to said diaphragm chamber,
“ resilient means for urging said valve to closed
position, a diaphragm closing said diaphragm
chamber, an exhaust valve seat member movable
with said diaphragm and communicating with
said diaphragm chamber and atmosphere, said
exhaust valve seat member having an exhaust
valve seat, an exhaust valve movable with said
supply valve and adapted to seat on said exhaust
valve seat for controlling exhaust from said dia
supply cham-ber spaced from and- communicating
with said diaphragm chamber, said mounting
f phragm chamber to atmosphere, control means
having a supply passage to said' supply chamber
and a control passage to‘said diaphragm chamber,
a supply valve for controlling supply from said
temperature' sensitive expansible member se
supply chamber to said diaphragm chamber, re
member movable by the expansible member,
for controlling operation of said diaphragm and
exhaust valve, said control means including a
cured toA said- base mounting, a non-expansible
2,411,295
means of selective and variable resistance for re
12
with said diaphragm chamber, said vmounting
having a supply passage to said supply chamber
and said mounting having a control passage to
said diaphragm chamber, a supply valve for Vcon
non-expansible member and said valves to vary 5 trolling supply from said supply chamber to said
diaphragm chamber, resilient means for urging
the compression between said last named means
said valve to closed position, a diaphragm closing
and said means of variable resistance for varying
said diaphragm chamber, an exhaust valve seat
the sensitivity of said thermostat.
member movable with said diaphragm and ,com
9. In a thermostat, the combination of a base
mounting having a diaphragm chamber and a 10 municating with said diaphragm chamber and
atmosphere, said exhaust valve seat member hav
supply chamber spaced from and communicating
ing an exhaust valve seat, an exhaust valve
with said diaphragm chamber, said mounting
adapted to seat on said exhaust valve seat for
having a supply passage to said supply chamber
controlling exhaust from said diaphragm cham
and said mounting having ya, control passage to
said diaphragm chamber, a supply valve for'con 15 ber to atmosphere, and control means for con
trolling operation of said diaphragm andexhaust
trolling supply from said supply chamber to said
valve, said control means including a temperature
diaphragm chamber, resilient means for urging
sensitive expansible member secured to said base
said valve to closed position, a diaphragm closing
mounting, a non-expansible member movable by
said diaphragm chamber, an exhaust valve seat
member movable with said diaphragm andY com zo the expansible member, an adjustable member
movably connected tosaid non-expansible mem
municating with said diaphragm chamber and
ber and disposed in alignment therewith and
atmosphere, said exhaust valve seat member hav
adjustable toward and away from said dia
ing an exhaust valve seat, an exhaust valve mov
phragm, and resilient means of selectable and
able with said supply valve and adapted to seat
on said exhaust valve seat for controlling exhaust 25 variable resilience interposed between said dia
sisting expansion of said expansible member,
means carried by said non-expansible member
adjustable and operative in alignment with said
from said diaphrag-mchamber to atmosphere,
phragm and adjustable member for resisting
movement of said non-expansible member to
control means for controlling operation of said
thereby variably transmit the movement of said
diaphragm and exhaust valve, said control means
expansible member to said diaphragm.
including a temperature sensitive expansible
l2. In a thermostat, the combination of a baseV
member secured to said base mounting, a non 30
mounting having a diaphragm chamber anda
expansible member movable by the expansible
supply chamber spaced from and communicating
member, an adjustable member movably con
with said diaphragm chamber, said mounting
nected to said non-expansible member and dis
having a supply passage to said sup-ply chamber
posed in alignment therewith and adjustable
toward and away from said diaphragm, and 35 and a control passage to said diaphragm cham
ber, a supply valve for controlling supply from
resilient means of selectable and variable resili
said supply chamber to said diaphragm chamber,
ence interposed between said diaphragm and ad
resilient means for urging said valve to closed
justable member for resisting movement of said
non-expansible member to thereby variably
position, a diaphragm closing said diaphragm
transmit the movement of said expansible mem 40 chamber, anexhaust valve seat member com
municating with said diaphragm chamber and
ber to said diaphragm.
atmosphere, said exhaust valve seat member hav
10. In a thermostat, the combination of a base
ing an exhaust valve seat, an exhaust valve for
mounting having a diaphragm chamber and a
said exhaust valve seat for controlling exhaust
supply chamber spaced from and communicating
with said diaphragm chamber, said mounting 45 from said diaphragm chamber to atmosphere,
having a supply passage to said supply chamber „ control means for controlling operation of ksaid
diaphragm and exhaust valve, said control means
and a control passage to said diaphragm cham
including a temperature Sensitive expansible
ber, a supply valve for controlling supply from
member secured to said base mounting, anon
said supply chamber to said diaphragm chamber,
resilient means for urging said valve to closed 50 expansible member movable by the expansible
member, an adjustable member movably con
position, a diaphragm closing said diaphragm
nected to said non-expansible member and dis
chamber, an exhaust valve seat member com
posed in alignment therewith and adjustable
municating with said diaphragm chamber and
toward and away from said diaphragm, and resil
atmosphere, said exhaust valve seat member hav
ing an exhaust valve seat, an exhaust valve for 55 ient means of selectable and variable resilience
interposed »between said diaphragm and adjusta
said exhaust Valve seat for controlling exhaust
ble member for resisting movement of said non
from said diaphragm chamber to atmosphere,
expansible member to thereby variably transmit
control means for controlling operation of said
the movement of said expansible member to said
diaphragm and exhaust valve, said control means
including a temperature sensitive expansible 50 diaphragm, and means whereby said adjustable
member is relatively moved with respect to said
member secured to said base mounting, a non
non-expansible member for obtaining wide limits
eXpansi-ble member movable by the expansible
of calibration of the thermostat.
member, an adjustable member movably con
13. In a thermostat, the combination of a base
nected to said non-expansible member and dis
posed in alignment therewith and adjustable 65 mounting having a diaphragm chamber and a
supply chamber spaced from and communicating
toward and away from said diaphragm, and
with said diaphragm chamber, said mounting
resilient means of selectable and variable resili
having a supply passage to said supply chamber
and a control passage'to said diaphragm cham
non-expansible member to thereby variably 70 ber, a supply valve for controlling supply from
said supply chamber to said diaphragm chamber,
.transmit the movement of said expansible mem
ber to said diaphragm.
resilient means for urging said valve to closed
position, a diaphragm closing said diaphragm
11. VIn a thermostat, the combination of a base
mounting having a diaphragm chamber and a
chamber, an exhaust valve seat member com->
ence interposed between said diaphragm and ad
justable member for resisting movement of said
supply chamber spaced from and communicating 75, municating with said diaphragm chamber and
2,411,295
13
14
atmosphere, said exhaust Valve seat member hav
member movable by the expansible member,
ing an exhaust valve seat, an exhaust Valve for
said exhaust valve seat for controlling exhaust
from said diaphragm chamber to atmosphere,
and control means for controlling operation of
said diaphragm and exhaust valve for controlling
exhaust from said diaphragm chamber to atmos
phere, said last named control means including
a temperature sensitive expansible member se
cured to said base mounting, a non-expansîble l0
means of selective variable resistance for resisting
expansion of said expansible member, and means
carried by said non-expansible member adjusta
ble to vary the compression between said last
named means and said means of variable resist
ance for varying the sensitivity of said thermo
stat.
ERWIN SABALLUS.
CARL WM. FISCHER.
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