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Патент USA US3062459

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Nov. 6, 1962
c. wANTz ETAL
3,062,449
THERMOSTATICALLY CONTROLLED FLUID VALVES
Filed Oct. 8, 1958
5 Sheets-Sheet l
222
2o
/
ETE. J
Nov. 6, 1962
C. WA NTZ ETAL
3,062,449
THERMOSTATICALLY CONTROLLED FLUID VALVES
Filed Oct. 8, 1958
5 She‘mEs--Sheei'l 2 A
28
42
Nov., 6, 1962
c. wANTz ETAL
3,062,449
THERMOSTATICALLY CONTROLLED FLUID VALVES
Filed 001;. 8, 1958
5 Sheets-Sheet 5
Nov. 6, 1962
c. wANTz ETAL
_
3,062,449
THERMOSTATICALLY coNTRoLLED FLUID VALVES
Filed oct. a, 1958
5 sheets-sheet 4
Nov. 6, 1962
c. WAN-rz ETAL
3,062,449
THERMOSTATICALLY coNTRoLLEn FLUID VALVES
Filed oct. s, 195s
y
5 Sheets-Sheet 5
V-ZIS
Vran
ne
llnited States 'Patent @hice
3,052,449
Patented Nov. 6, 1962
1
3,062,449
TIERMOSTATICALLY CONTROLLED FLUID
VALVES
Clarence Wantz and William S. Kanzler, Greensburg, Pa.,
assignors to Rohertshaw-Fulton Controls Company,
Richmond, Va., a corporation of Delaware
Filed (1ct. 8, 1958, Ser. No. 766,017
9 Claims. (Cl. 236-99)
This invention relates to thermostatically controlled
FIG. 1 is a front elevation view of a control device
embodying this invention with the cover in dashed lines;
FIG. 2 is a top plan view of the device shown in FIG.
l with the cover removed;
FIG. 3 is a longitudinal sectional view of the device
shown in FIG. l;
FIG. 4 is an elevation view of a detail of the device
shown in FIG. 3;
FIG. 5 is an exploded perspective view of a portion
of the device shown in FIG. 3;
FIG. 6 is an exploded perspective View of another
Conventional thermostatic top burner control valves
portion of the device shown in FIG. 3;
have required large gas cocks to supply sufficient fluid
FIGS. 7a, 8a, and 9a are front elevation views show
to maintain the flame at the burner at all temperature set
ing the control dial in various positions;
tings of a dial. Except where two dials are used, they 15
FIGS. 7b, 8b, and 9b are fragmentary views with a
provide no adjustment of llame height to enable the user
member sectioned showing the cam mechanism and the
to select the flame size best suited to heating of a desired
sector plate and pin in various positions; and
cooking utensil. In those thermostatic valves providing
FIGS. 7c, Sc, and 9c are sectional views taken on line
flame height adjustment, one knob adjusts the tempera
C_C of FIG. 2 showing the valve members in various
ture setting and the second knob, usually concentric with 20 positions.
and at the center of the temperature knob, provides llame
Referring more particularly to the drawings, the con
height adjustment.
trol device indicated generally at 10 comprises a casing
Previous thermostatic values have incorporated screw
or valve body 12 having a cover 14 and being provided
fluid valves and more particularly to those which are used
in connection with gas range top burners.
threads as a means for effecting temperature adjustment.
with an inlet 16 and an outlet 18. The control li) may
Leads of screw threads are iixed and retain a rigid rela 25 be mounted on a range manifold (not shown) by means
tionship between angular rotation and axial movement.
of a flanged nipple 20 which has a passage 21 therein for
Therefore, while they effect changes in the control tern
communication with the inlet 16. The nipple 2li is
perature as the dial is rotated, they cannot be easily
threaded into the manifold and then attached to the valve
tailored to match each thermostatic sensing element
body l2 by a pair of screws 22 (FIG. 2) which extend
such that the actual change in control temperature will 30 through openings 24 (FIG. 5) in the valve body 12 and
match the indicated temperature on the dial. The use
corresponding openings (not shown) in the flanges of
of the screw thread type temperature adjustment also
nipple 20. A hood 26 is threaded onto the valve body
limits the flexibility and choice of dial markings.
12 over the outlet lâ and is adapted to supply fuel to the
It is an object of this invention to introduce greater
main burner of a gas range (not shown).
flexibility in the matter of choice of dial markings.
35
The valve body l2 is provided with a boss 28 extend
It is another object of this invention to decrease the
ing upwardly from a central location on the bottom there
size of the control to provide a relatively inexpensive com
of. The boss 28 has a passage 3d extending centrally
pact item.
therethrough which communicates with inlet I6. A
It is a further object of this invention to provide a
frusta-conical opening is formed in casing l2 and extends
single dial for turning the iluid supply “on” or “oli” 40 through a boss 2S at right angles to the passage 30 to
controlling lluid flow to a burner for adjusting the llame
form a valve seat 32. A corresponding frusto-conical
height, and to select the desired cooking temperature.
shaped valve cock 34, having a passage 36 perpendicular
It is a still further object of this invention to com
to the longitudinal axis thereof, is inserted in valve seat
pensate for error in the temperature sensing apparatus
32. The valve plug 34 is rotatable for aligning or partial
due to ambient temperature variations.
ly aligning passage 36 with inlet 16' and passage 39. It
It is still another object of this invention to provide a
is apparent that the position of valve plug 34 determines
built-in overtravel relief for thermostatically controlled
the capacity of fluid flow to the valve body 12 thereby ad
fluid valves.
justing the llame size at the main burner.
It is still another object of this invention to provide a
Means is provided for rotating the valve plug 34.
control device which may be fully assembled outside 50 More particularly, the outwardly extending end of valve
the valve body and then inserted into the valve body as
plug 34 is provided with an axial recess 33 to receive the
a unit.
reduced end 40 of a cylindrical valve stem 42.
The
In the preferred embodiment of this invention, a con
cylindrical valve stem 42 is provided with a flattened por
trol device comprises a casing having a pair of valves
tion 46 on one side thereof. A D-shaped opening 48
disposed therein. The first valve is operated by a dial to 55 formed in an end 50 of a hub 52 is adapted to cooperate
control the capacity of flow to the fluid burner, thereby
with the flattened portion 46 in such a manner that when
controlling the size of a llame thereon. A second valve is
the valve stem 42 is rotated, hub S2 rotates also. The
thermostatically operated in response to a temperature of
hub 52 is also provided with a peripheral flange S4 form
a utensil on the burner to control the existence of a
ing a cam surface 55, the purpose and details of which
llame at the burner, thereby maintaining the utensil at a 60 will be described fully hereinafter.
desired temperature. The dial has a movement for oper
The hub 52 is positioned with respect to the valve body
ating the ñrst valve and a separate movement for oper
12 by a bearing guide 56 within which the hub 52 is
ating a cam-lever mechanism to select the desired utensil
rotatably mounted. The bearing guide 56 is provided
temperature. The cam mechanism is tailored to match
with ears 5S having openings 60 therein which cooper
the movement of the sensing element for the range of 65 ate with guide pins 62 on the valve body l2 to accurately
temperatures through which the dial is rotatable and the
lever mechanism is externally adjustable to calibrate
control.
Other objects and advantages of this invention will be
come apparent from the following detailed description 70
taken in connection with the accompanying drawings,
wherein:
locate the bearing guide S6 which is then firmly attached
to the valve body l2 by a pair of screws 64 (FIG. l).
The screws 64 extend through the ears 58 and into the
valve body l2. A dial or knob 66 (FIGS. 7a«9a), having
suitable indicia 68 thereon, is attached to the protrud
ing end of valve stem 42 and is manually operable to
rotate the same. Rotation of dial 66 is limited to less
4
than 360° by engagement of the tab 70 which is formed
on the tlange 54 of hub 52 with a pair of abutments 72,
74 (FIG. 1) formed on the face of valve body 12.
Means is provided for normally preventing separation
of the valve stem 42 from the valve plug 34 and the hub
52. More particularly, a spring clip 76 (best shown in
FIG. 6) is provided in a machined undercut in the valve
stem 42. The spring clip ‘76 is biased to protrude slightly
beyond the valve stem periphery so as to engage the end
50 of hub 52 to prevent further movement of the valve
stem 42 in the outward direction.
The valve plug 34 is biased into leak-tight engagement
with valve seat 32 by a coil spring '78 which is disposed
around the valve stem 42. The bias of coil spring 78
is transmitted to the end of valve plug 34 through a
washer 80 and a sector plate 82. Sector plate 82 is
provided with a D-shaped opening 84 corresponding to
formed in a side wall 146 of valve body 1‘2 adjacent the
rear thereof and a threaded aperture 148 is formed in the
side wall 150 opposite the bore. The pivot pin 100 is in
serted into the threaded aperture 148 and the bore in side
wall 146. A retaining screw 152 is provided with a driv
ing slot 154 at one end and an internal recess 156 at the
opposite end for receiving the pivot pin 100. The retain
ing screw 152 is threaded into aperture 148 until the pin
100 is ñrmly held between the side wall 146 and the re
taining screw. Thus, one end of the subassembly is tixed
within the valve body 12. The Íree end of the sub
assembly is supported by a formed tab 158 which extends
outwardly from overshoot lever 102 and is adapted to
rest on a cam pin guide 160 which extends upwardly ad
jacent the front face of the valve body 12. A second
formed tab 162 extends outwardly from the overshoot
lever 102 and an aperture 164 is formed therein to anchor
one end of a biasing means which takes the form of an
the reduced end 49 of valve stem 42 and is inserted there
on to rotate with the valve stem upon manual operation
of dial 66. A pair of abutment surfaces 86, 88 are pro- ~
vided on the sector plate 82 and are adapted to cooperate
with an abutment pin 90 extending outwardly from a
radial point on the end of valve plug 34 to cause rotation
thereof. The abutting surfaces 86, 83 are formed on the
sector plate 82 approximately 210° apart so that the dial 25
overshoot spring 166 (FIG. 4). The other end of over
shoot spring 166 is hooked around pin 112 thereby re
straining clockwise rotation of overshoot lever 102 about
66 may be rotated through approximately this angle with
out causing rotation of valve plug 34. The purpose of
this lost motion connection will become apparent herein
body 12. The clamping plate 172 is positioned external
pin 110.
Means is provided for varying the position of the sub
assembly within the valve body 12. More particularly,
an adjusting screw 168 having a pointed end 170 extends
through a clamping plate 172 and the front face of valve
ly of the valve body 12 and acts to hold the adjusling
screw 168 in its set position and is provided with suitable
after.
indicia 174 disposed thereon. A driving slot 176 pro
A second valve seat 92 is formed in the valve body 12 30 vided on adjusting screw 168 cooperates with the indicia
by tapering the terminal portion of the upwardly extend
174 to indicate the rotational position of the adjusting
ing boss 28. A valve cavity 94 is formed in the valve
screw relative thereto. The pointed end 170 of adjusting
body 12 about valve seat 92 for the reception of a valve
screw 168 engages pin 112 of the pivot frame 96 so that
subassembly. This subassembly (best shown in FIG. 5)
axial movement of the adjusting screw will cause pivotal
comprises a pivot frame 96, a seat lever 98, an overshoot 35 movement of the subassembly about pin 100.
lever 102, and a bimetal lever 104. More particularly,
The seat lever 98 of the subassembly is adapted to pivot
the pivot frame 96 consists of a pair of substsntialÍy tri
counterclockwise about pin 100 to cause engagement of
angular-shaped sides 106, 103. The sides 106, 108 are
valve disc 134 with the valve seat 92 to prevent iluid tlow
held in opposed relation by a pair of pins 110 and 112
to the valve body 12. However, resilient means in the
which are staked to the sides at two of the three ex 40 form of a small coil spring 178 (FIG. 7c) is fixed in valve
tremities thereof. The third extremity of each side 106,
body 12 adjacent Valve seat 92 and is adapted to engage
108 is provided with a pierced hole 114. The pierced
the bottom of side 116 to normally bias seat lever 98 to an
holes 114 are adapted to receive pivot pin 100 thereby
open position.
pivotally mounting frame 96 thereon.
Means is provided for causing engagement of seat lever
The seat lever 98 consists of a pair of sides 116, 118,
104 with valve seat 92 in response to the temperature of
each having an ear 120 formed on one end.
The ears
120 are provided with pierced holes 122 which are adapt
ed to pivotally mount the seat lever 98 on pin 100 be
tween the opposide sides 106, 108 of the pivot frame 96.
a utensil on the main burner of a gas range. More partic
ularly, the valve cover 14, having thermostatic means
thereon, is firmly secured to the valve body 12 by four
screws 180 (only two shown in FIG. 1) which extend
50
A plate 124 is formed integral with the sides 116, 118 0f
through suitable apertures in the cover 14 and are thread
seat lever 98 and extends therebetween. An aperture
ed into apertures 182 in the valve body 12. A sealing
126 is disposed centrally in plate 124 and a portion of a
gasket 184 is placed between the cover 14 and the valve
ball bearing 128 is received therein on the underside of
body 12 to provide a duid-tight connection. The thermo
plate 124. The ball bearing 128 is held within the aper
static mean scomprises a threaded inner stud 186 which
ture 126 by a spring clip 130 which is provided with a
is locked into position on the cover 14 by a nut 188.
pair of prongs therefor and is ñxedly mounted on the un
An expansible diaphragm assembly 190 is attached to the
derside of plate 124 at 132 (FIG. 2). A valve disc 134 is
inner stud on the inner side of the cover 14 and a capillary
welded to the ball bearing 128 and is adapted to cooperate
tube 192 is attached to the inner stud on the external side
with valve seat 92 to prevent fluid ñow therethrough. It
is now apparent that the seat lever 98 forms a self-leveling 60 of cover 14. A sensing head 194 is carried by the capil
lary tube 192 and mounted at the main burner of the gas
valve assembly with valve seat 92.
range and adapted to engage a cooking utensil situated
A rectangular-shaped tab 136 extends from the plate
thereon to sense the temperature thereof. This assembly
124 of seat lever 98 at an angle thereto and is provided
is charged with a liquid which expands or contracts in
with a formed projection 138. The bimetal lever 10-4 is
adapted to have one end resting on the formed projection 65 response to variations in temperature to provide a hy
draulic motive power to the diaphragm assembly 190.
138 and a pair of indentations 140 on the other end are
This thrust is transmitted through outer stud 196 on the
adapted to receive a pair of pivot pins 142 which extend
diaphragm 190 to a formed projection 198 disposed on
upwardly from the overshoot lever 102. The overshoot
the bimetal lever 104. The overshoot spring 166 is rela
lever 102 is provided with upturned ears 144 which are
adapted to pivotally mount the overshoot lever on pin 110 70 tively strong so that upon receiving thrust from the
outer stud 196, the bimetal lever 104 pivots about the
between the opposed sides 106, 108 of pivot frame 96.
pivot pins 142 on overshoot lever 102. This transmits
It is now apparent that pivot frame 96, seat lever 98,
the thrust to seat lever 98 thereby pivoting the seat lever
bimetal lever 104, and overshoot lever 102 comprise a
about pin 100 against the bias of the coil spring 178 to
unitary subassembly on pin 100. To insert this sub
move the valve disc 134 into engagement with valve seat
assembly in the valve cavity 94, a bore (not shown) is
5
3,062,449
6
92. Upon norma] overshoot or if the sensing head 194 is
a temperature of approximately 425° F. will be required
suddenly subjected to extremely high temperatures, the
to operate the seat lever 98.
The control is calibrated by setting the dial at some
excess thrust created will be transmitted to the overshoot
lever 102 which will pivot about pin 110 against the bias
of overshoot spring 166 to prevent excessively stressing the
position, for example 200° F., and the sensing head 194
is immersed in a bath -of corresponding temperature.
Thus, the position of the outer stud 96 will be established.
It is desired that the projection 198 on bimetal lever 104
control parts.
Means is provided for setting the temperature at which
the seat lever 98 will be moved into engagement with the
engage the outer stud 196 for operating seat lever 98 at
valve seat 92. More particularly, a cam pin 200 is dis
posed in the cam pin guide 160 and is operable to engage 10 exactly this temperature to stop fluid flow through the
valve body 12. To this end, adjusting screw 168 is
the formed tab 158 to rotate overshoot lever 102 and bi
manipulated to cause the pointed end 170 thereof to ro
metal lever 104 thereby Varying the position of the formed
tate the pivot frame 96. Rotation of pivot frame 96
projection 198 with respect to the outer stud 196 on the
adjusts the position of projection 198 relative to outer stud
expandable diaphragm assembly 190. With a changed
position of projection 198, it is apparent that a different 15 196 and by proper manipulation of the adjusting screw
168, the valve disc 134 may be moved into engagement
sensed temperature will be required to cause engagement
with valve seat 92 at exactly the set temperature of
of the outer stud 196 with the projection 198 for pivot
200° F.
ing the seat lever 98 into engagement with valve seat 92.
Operation
The cam pin 200 and cam pin guide 160 form part of a
follower assembly which is situated in a bore 202 provid 20
After calibration, the control is mounted on a range
manifold by means of the flanged nipple 20 and the sens
ed in the valve body 12 adjacent the front face thereof and
positioned above flange 54 of hub 52. A reduced portion
ing head 186 may be mounted in the main burner of the
range for contact with any suitable cooking utensil placed
204 is provided in bore 202 adjacent the bottom thereof
thereon. Initially, the dial 66 is in the “off” position and
and slidably mounts a cam button 206. The cam button
206 is of cup-shaped configuration and has an outwardly 25 the parts are situated as shown in FIGS. 7a, 7b, and 7c,
with the valve plug 34 in position to cut off fluid flow
extending flange 208 (FIG. 6) which is adapted to en
through the valve body 12. Dial 66 is rotated in a
gage the shoulder formed by the junction of the bore 202
counterclockwise direction to “HI” position, as shown
and the reduced portion 204 to prevent extraction of the
in FIG. 8a, whereby tab 70 engages abutment 74. The
cam button. The cam pin guide 160 has the bottom
thereof fixed within the upper portion of bore 202 and the 30 sector plate 82 rotates with the dial 66 and the abutting
surface 86 thereon rotates through an angle of approxi
cam pin 200 extends through an aperture 210 disposed
mately 210° before it engages pin 90 to rotate the valve
centrally therein. The other end of cam pin 200 is seated
plug 34 to the position shown in FIG. 8b for permitting
within the cup-shaped cam button 206. A coil spring 212,
a washer 214, and a seal 216 are disposed around the
cam pin 200 and the spring 212 is compressed between
the cam button 206 and the washer 214. This compresses
seal 216 which is positioned between the washer 214 and
the cam pin guide 160 to form a slidable leak-tight con
fluid flow through the valve body. Fluid now flows
f through inlet 16 and valve plug passage 36 -to a pilot
nection with the cam pin 200 and also urges the cam
butìon 206 into engagement with the cam surface 55 40
formed on the perimeter of hub flange 54. The cam
passage 220 (FIG. 7c) for-med in the valve body 12.
The pilot passage 220 communicates with the pilot
outlet 222 situated on the side of casing 12. Suitable
means (not shown) is attached to pilot outlet 222 for
supplying fluid to a pilot burner (not shown) which is
customarily situated in igniting relationship with the main
burner. A screw 224 (FIG. l) is threaded into the front
face of valve body 12 and communicates with pilot pas
sage 220 and is adjustable to selectively restrict the fluid
flow therethrough. The seat lever 98 is normally biased
sively increases when proceeding in a clockwise direction
until a point is reached adjacent the other side of tab 70. 45 by coil spring 178 away from valve seat 92 thereby also
allowing fluid flow through outlet 18 to the main burner.
As shown in FIGS. 7a and 7b, when the “off” position
After ignition of the main burner, the dial 66 is rotated
of indicia 68 on dial 66 is adjacent a reference point 218,
in a clockwise direction to the desired temperature set
which may be suitably positioned on the valve body 12
ting indicated on indicia 68. Note that 4during the tem
or a bezel (not shown) inserted on the bearing guide 56,
surface 5S of circular hub flange 54 is substantially in the
form of an involute. The radius of the cam surface 55 is
comparatively small on one side of tab 70 and it progres
the cam pin 200 rests on the lower level of the cam sur
face 55. Thus, the cam pin 200 is in its low position and
protrudes only slightly from the cam pin guide 160. The
50 perature setting movement, the position of the valve plug
34 is not affected due to the lost motion connection be
tween pin 90 and the abutting surfaces 86, 88 of sector
plate 82. However, if a small cooking utensil is positioned
overshoot spring 166 urges overshoot lever 102 in a coun
terclockwise direction to maintain the formed tab 158 in 55 over the burner and a flame height less than the full in
put is desired, the dial is rotated from “HI” in a clockwise
engagement with the cam pin. This rotation of overshoot
direction to the graduated portion 226 of indicia 68. This
lever 102 positions the formed projection 198 on bimetal
moves
abutting surface 88 of sector plate 82 through an
104 such that a low sensed temperature will cause engage
angle of approximately 210° into engagement with pin
ment of the outer stud 196 with the projection 198 to
cause pivotal movement of the bimetal lever 104 about 60 90. The operator then adjusts the flame height visually
or by the markings on the indicia 224 to the desired
the pivot pins 142. The thrust is then transmitted to
flame height. Reduced flame height is caused by rota
projection 138 causing rotation of the seat lever 98 about
tion of valve plug 34 to a position limiting fluid flow
pin 110 to engage with valve seat 92.
to the casing as shown in FIG. 9c. A notch 228 is pro
Counterclockwise rotation of the dial 66 raises the cam
vided on the valve plug 34 to insure adequate pilot ñow
pin 200 causing clockwise rotation of overshoot lever 102 65 in this reduced flow position.
against the bias of overshoot spring 166 to move the pro
After the flame height adjustment has been made, the
jection 198 away from the outer stud 196. Hence, a
dial 66 is then rotated counterclockwise to the desired
higher sensed temperature will be required to move outer
temperature setting. It should again be noted that the
stud 196 into engagement with the projection 198 to cause
movement to the temperature setting position does not
operation of the seat lever 98. The cam pin 200 is con 70 affect the position of the valve plug 34 since abutting
surface 88 merely moves away from pin 90 and the
tinually raised as the dial 66 is rotated in the counter
rotation is not sufficient to bring abutting surface 88 into
clockwise direction until the tab 70 engages the abutment
contact with the pin 90.
74 on the face of the valve body 12. This corresponds
Movement of dial 66 to the desired temperature setting
to the “HI” position of the dial as shown in FIG. 8a and 75
position causes rotation of the cam surface 55 to position
3,062,449
the height of cam pin 200 thereby adjusting the relative
position between projection 198 and outer stud 196.
Hence, when the cooking utensil reaches a selected tern
perature, for example 300° F. as shown in FIG. 9a, the
outer stud 196 will be moved against projection 198 and
the bimetal lever 104 will pivot about pins 142I on over
shoot lever 102. This transmits movement of the bimetal
disposed in said passage to regulate the flow of gas
through said passage to maintain a selected temperature
adjac-ent a gas burner operatively connected to said valve
assembly for control thereby, and a plug valve disposed in
said passage for rotative adjustment between a fully
closed position and a fully open position to regulate the
flow of gas through said passage to maintain a selected
fiame height at said burner; the improvement comprising
lever 104 to the seat lever 98 causing pivotal movement
a dial shaft mounted in said housing for rotation between
of the same about pin 100 to move valve disc 134 into
angularly spaced end limits of rotation, first one-way ro
engagement with valve seat 92 to stop ñuid fiow to the 10 tary coupling means engageable between said shaft and
main burner.
said plug valve when said shaft is within a first angular
When the temperature of the utensil as sensed by head
range of movement terminating at one of said end limits
194 decreases below the set temperature of 300° F., the
for rotating said plug valve toward its fully opened posi
outer stud 196 will move away from the projection 19S
tion upon rotation of said shaft within said ñrst range
and the valve disc 134 will be moved away from valve 15 toward said one end limit, second one-way rotary coupling
seat 92 to permit fluid flow to the main burner. Fluid
means engageable between said shaft and said plug valve
flowing tothe main burner will be ignited by the pilot
when said shaft is within a second angular range of move
and the cooking utensil will again be heated until the tem
ment terminating at the other of said end limits, said first
perature thereof reaches 300° F. It is apparent that an
and said second angular ranges of movement being spaced
intermittent flame will be produced at the main burner 20 from each other by an intermediate angular range of
to maintain the temperature of the cooking utensil at that
movement, said second coupling means being operable
set on dial 66.
Should the ambient temperature of the control device
when engaged to rotate said plug valve toward its fully
closed position upon rotation of said shaft within said sec
increase, such as due to the use of adjacent burners, this
ond range toward said other of said end limits, and cam
will cause an increased expansion of the diaphragm assem 25 means on said shaft coupled to said thermostatic valve for
bly 190. However, bimetal lever 104 will also be heated
adjusting said thermostatic valve to select the temperature
and will warp in such a manner as to compensate for the
to be maintained adjacent said burner in accordance with
the angular position of said shaft within said intermediate
in the ambient temperatures have no appreciable effect
angular range of movement whereby said plug valve may
30
on the calibration or control afforded at a given dial
be moved to an adjusted rotated position and said
setting.
thermostatic valve may be subsequently adjusted to the
While a single embodiment of this invention has been
desired temperature setting independently of the adjusted
shown and described particularly in connection with gas
rotated position of said plug valve.
variance in the sensing device.
Consequently, changes
range surface burners, it is apparent that there may be
3. In a device fo-r controlling the flow of fiuid in ac
changes in the application thereof as well as in the struc 35 cordance with temperature variations, the combination
ture and operation without departing from the scope of
comprising a casing having a valve seat situated therein,
this invention as defined by the appended claims.
a seat lever pivotally mounted in said casing for coopera
We claim:
tion with said valve seat to regulate fluid flow there
l. In a gas oven burner control valve assembly includ
40 through, resilient means normally urging said seat lever
ing a valve housing having a gas flow passage there
to an open position, an overshoot lever also pivotally
through, an adjustable thermostatic valve disposed in said
mounted in said casing, biasing means being stronger than
passage to regulate the ñow of gas through said passage
said resilient means for urging said overshoot lever in
to maintain a selected temperature adjacent a gas burner
one direction, cam means for urging said overshoot lever
operatively connected to said valve assembly for con
against the action of said biasing means, another lever
trol thereby, and a plug valve disposed in said passage 45 suspended between said seat lever and said overshoot
for rotative adjustment between a fully closed position
and a fully open position to regulate the flow of gas
through said passage to maintain a selected llame height
at said burner; the improvement comprising a dial shaft
lever, thermally responsive means attached to said casing
and engaging said suspended lever in response to tempera
ture variations to pivot said seat lever into engagement
with said valve seat, said overshoot lever pivoting against
mounted in said housing for rotation in opposite first and 50 the action of said biasing means to absorb overtravel of
second directions, adjusting means on said shaft cooper
said thermally responsive means, and said cam means
able with said thermostatic valve within a given range
being operable to move said suspended lever relative to
of angular movement of said shaft to adjustably select
said thermally responsive means thereby determining the
the temperature to be maintained by said thermostatic
temperature at which said thermally responsive means
valve in accordance with the angular position of said shaft 55 will engage said suspended lever to pivot said seat lever
within said given range, plug valve opening means oper
into engagement with said valve seat.
able by rotation of said shaft in said first direction beyond
4. In a device for controlling the flow of ñuid in accord
one end of said given range to rotate said plug valve to
ance with temperature variations, the combination com
ward its fully open position, said valve opening means
a casing having a valve seat situated therein, a seat
being ineffective to vary the position of said plug valve 60 prising
lever
pivotally
mounted in said casing for cooperation
during rotation of said shaft in said second direction,
with said valve seat to regulate fluid flow therethrough,
and plug valve closing means operable by rotation of said
resilient means normally urging said seat lever to an open
shaft in said second direction beyond the other end of
position, a frame pivotally mounted in said casing having
said given range to move said plug valve toward its
closed position, said valve closing means being ineffective 65 an overshoot lever pivotally mounted thereon, biasing
means being stronger than said resilient means for urging
to vary the position of said plug valve during rotation of
said overshoot lever in one direction, cam means situated
said shaft in said first direction whereby said plug valve
in said casing for urging said overshoot lever against the
may be moved to an adjusted rotated position by rotation
action of said biasing means to restrain pivotal movement
of said shaft in one direction and said thermostatic valve
may be adjusted independently of the position of said 70 of said frame in one direction, adjustment means engaging
said frame for restraining pivotal movement thereof in
plug valve by subsequent rotation of said shaft in the op
the other direction, another lever suspended between said
posite direction.
seat lever and said overshoot lever, thermally responsive
2. In a gas oven burner control valve assembly having
means attached to said casing and engaging said suspended
a valve housing, means defining a gas flow passage
through said housing, an adjustable thermostatic valve 75 lever in response to temperature variations to pivot said
9
3,062,449
seat lever into engagement with said valve seat, said over
shoot lever pivoting against the action of said biasing
means to absorb overtravel of said thermally responsive
means, said cam means being operable to move said sus
pended lever relative to said thermally responsive means
thereby determining the temperature at which said ther
mally responsive means will engage said suspended lever
to pivot said seat lever into engagement with said valve
10
with respect thereto to control fluid ñow therethrough, a
second valveseat in said casing, a seat lever pivotally
mounted in said casing for cooperation with said second
valve seat to regulate the fluid flow therethrough, resili
ent means normally urging said seat lever to an open
position, a pin extending outwardly from an end of said
first valve member, manually operable means including a
plurality of abutment surfaces, said manually operable
seat, and said adjustment means being operable to pivot
said frame thereby also moving said suspended lever rel 10 means being rotatable in one direction to cause engage
ment >of one of said abutment surfaces with said pin t0
ative to said thermally responsive means to adjust the
temperature at which said seat lever will engage said
valve seat.
5. The device of claim 4 wherein said thermally re
open said first valve and being rotatable in the other di
rection to cause engagement of another of said abutment
surfaces with said pin to move said iirst valve member
sponsive means comprises an assembly charged with a 15 to a controlling position, a frame pivotally mounted in
said casing having an overshoot lever pivotally mounted
temperature sensitive fluid and having a diaphragm mount
thereon, biasing means being stronger than said resilient
ed on said casing and Ia sensing element adapted to be
means for urging said overshoot lever in one direction,
remotely situated, said suspended lever being of bi
cam means associated with said manually operable means
metallic construction and adapted to warp to compensate
and being operable thereby for urging said overshoot lever
for variations in fluid expansion due to ambient tempera 20 against the action of said biasing means to restrain piv
ture variations.
otal movement of said frame in one direction, adjustment
6. In a control device, the combination `comprising a
means engaging said frame for restraining pivotal move
casing having a passage therethrough for the llow of Huid,
ment thereof in the other direction, another lever sus
a valve seat intercepting said passage, a plug valve mem
pended between said seat lever `and said overshoot lever,
thermally responsive means attached to said casing en
gaging said suspended lever in response to temperature
said casing passage, an end of said plug having a recess
variations to pivot said seat lever into engagement with
disposed centrally therein and a pin protruding from a
said second valve seat, said overshoot lever pivoting
radial point thereon, a shaft having a pair of abutment
against the action of said biasing means to absorb over
surfaces associated therewith and being rotatably mount 30 travel
of said thermally responsive means, said manual
ed in said recess, a dial attached to said shaft and being
ly operable means being operable to move said suspend
rotatable in one direction to :cause engagement of one
ed lever relative to said thermally responsive means
of said abutment surfaces with said pin to align said plug
thereby
determining the temperature at which said ther
passage with said casing passage `and lbeing rotatable in
mally responsive means will engage said suspended le
ber having a passage therethrough and being rotatably
mounted in said seat for aligning said plug passage with
the other direction to cause engagement of the other of 35
ver to pivot said seat lever into engagement with said
said abutment surfaces with said pin to partially align
said plug passage with said casing passage, said abutment
surfaces being displaced from each other whereby said
dial is rotatable independently of said plug valve member.
second valve seat, said abutment surfaces being displaced
from each other whereby said manually operable means
moves said suspended lever independently of said first
valve member, and said adjustment means being oper
7. In a control device, the combination comprising a 40 able to pivot said frame thereby moving said suspended
casing having a passage therethrough for the ñow of
lever relative to said thermally responsive means to ad
fluid, a first valve seat intercepting said passage, a plug
just
the temperature at which said seat lever will engage
valve member having a passage therethrough and being
said second valve seat.
rotatably mounted in said first valve seat for aligning
9. In a device for controlling the flow of fluid in ac
said plug passage with said casing passage, an end of 45
cordance with temperature variations, the combination
said plug having a recess disposed centrally therein and
comprising a casing having a normally open valve posi
a pin protruding from a radial point thereon, a shaft hav
tioned therein for controlling the Huid flow through said
ing a pair of abutment surfaces associated therewith and
casing, overtravel means pivotally mounted in said cas
'being rotatably supported in said recess7 cam means asso
ciated with said shaft for operation thereby, a second 50 ing and including biasing means for urging said overtravel
means in one direction, manually operable means for
valve in said casing, lever means operatively connected
urging said overtravel means against the action of said
to said cam means and said second valve, thermally re
biasing means, bimetallic means forming an operative
sponsive means operable to engage said lever means in
connection between said valve and said overtravel means
response to temperature variations for moving the same
to
compensate for ambient temperature variations, and
to cause actuation of said second valve, a dial attached 55 thermally responsive means engaging said operative con
to said shaft and being rotatable in one direction to cause
nection in response to a predetermined temperature to
engagement of one of said abutment surfaces with said
close said valve, said overtravel means being adapted to
pin to align said plug passage with said casing passage
pivot against the action of said biasing means to absorb
overtravel of said thermally responsive means, said man
gagement of the other of said abutment surfaces with 60 ually operable means being operable to move said oper
said pin to cause partial alignment of said plug passage
ative connection relative to said thermally responsive
with said casing passage, said lever means being selec
means thereby determining the temperature at which said
tively positioned relative to said thermally responsive
thermally responsive means will engage said operative
and being rotatable in the other `direction to rcause en
means in response to movement of said dial thereby set
connection to close said valve.
ting the temperature at which said thermally responsive 65
means will engage said lever means to actuate said sec
References Cited in the tile of this patent
ond valve, said abutment surfaces `being displaced from
each other whereby said dial is operable to position said
lever means independently of movement of said plug
70
valve member.
8. A control device comprising -in combination a cas
ing having an inlet and an outlet, a iirst valve seat in
said casing and a first valve member rotatably mounted
UNITED STATES PATENTS
1,977,552
2,004,597
2,006,930
2,099,171
2,393,841
2,987,257
Grayson _____________ __ Oct. 16,
Birtch ______________ __ June 11,
Newell et al. __________ _.. July 2,
Matthews ____________ __ Nov. 16,
Titcomb _____________ __ Jan. 29,
Sherlock _____________ __ June 6,
1934
1935
1935
1937
1946
1961
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