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Dec- 7, 1943-
‘
v. WEBER ETAL
2,455,542
SAFETY DEVICE FOR FUEL BURNERS
FilQd April 1, @944
3 Shaeis-Sheet 1
INVENTORS.
Vzc TOR 602052 é
Eusssu. F. Gmwvak
Meir‘ ATTORNEY
Dec. 7, 1948.
2,455,542
v. WEBER ETAL
SAFETY DEVICE FOR FUEL BURNERS
3 Sheets—Sheet 2
Filed April 1, 1944
122 “a
120
126
124
12a
‘@9
: z?mm.
INVENTORS.
Vzcroe (ell-0E2 $5
1903551. 1. f1 Gan/v52
B
the/P ATTORNEY
Dec. 7, 1948.
~
V. WEBER
2,455,542
ET AL '
SAFETY DEVICE FOR FUEL BuRNERs
Filed April 1, 1944
5 Sheets-Sheet
I
VOW‘.
7w
I!
1
112
INVENTORS.
Vzc 7'02 céTEasef
,Pusszu. E Gan/v52
BY
'
WM\
15/18 '- ATTORNEY
2,455,542
’ Patented Dec. 7, 1948
UNITED ‘STATES PATENT OFFICE
2,455,542
SAFETY DEVICE FOR FUEL BURNEBS
Victor Weber. Greensburg, and Russell F. Garner,
Youngwood, Pa., asalgnors to Robertshaw
Fulton Controls Company, a corporation of
Delaware
Application April 1, 1944, Serial No. 529,201
8 Claims. (Cl. 158—117.1)
1
This invention relates to safety controls for
fuel burners and, more particularly, to' thermo
electric devices for controlling flow of gaseous
fuel to water heaters and like appliances.
Appliances of the type indicated have been
provided with electrically operated safety valves
2
Figs. 12 and 14 are partial sections taken on
line XII-Jill of Fig. 3 showing the different port
positions of the main control valve; and
Figs. 13 and 15 are partial sections taken on
line XIII-XIII of Fig. 3 showing the different
by-pass passage positions of the main control
which are energized by current generated by a
thermoelectric device exposed to the ?ame of the
valve.
such as excessive temperature or pressure in the
duces a flame which serves to heat a thermo
.
Referring more particularly to Fig. 1 of the
drawings, the main burner ill of a water heater
pilot burner. The safety valve iskthus operable
for shutting off the flow of fuel to the main and 10 i2 is supplied with gaseous fuel through a pipe
l4 and the pilot burner is for the main burner
pilot burners of the appliance when the pilot
is supplied with gaseous fuel through a pipe i8.
burner becomes extinguished. Various means
The fuel supplied to both the main and pilot
have also been provided to render the thermo
burners is controlled by the control device 2i of
electric device incapable of maintaining the
this invention and ‘which will be more fully de
safety valve open during the normal operation
scribed hereinafter. The pilot burner it pro
of the burners if a dangerous condition arises,
water being heated by the burners.
An object of this invention is to improve such
devices by providing positive acting means to
couple element 20 positioned adjacent thereto
shut-off the flow of fuel to the main and pilot
burners whenever a predetermined water tem
and upon extinguishment of the pilot burner
?ame the thermocouple 26 will cool and cause
the gas supply to the main burner it to be cut
off by operation of the control device 2i of this
perature is reached.
invention.
Another object of the invention is to accom
I
Referring now more particularly to Figs. 2, 3
and 4 of the drawings, the control device M of
this invention comprises a housing formed of two
main parts, namely/a valve body as and a
plish the shut-off by operation of the thermo
electric safety valve but independent of the cur
rent generated by the thermocouple.
‘ magnet body 26. These parts are suitably bolted
Another object of the invention is to insure
or otherwise secured together and sealed against
positive actuation of the safety valve to closed
position both in the event of pilot ?ame extin 30 leakage of gaseous fuel through the joints thus
formed.
guishment or excessive water temperature.
The valve body 24 is adaptedfor insertion in
Another object of the invention is to prevent
the pipe l4 by provision of an inlet 28 at one end
?ow of fuel to the main burner until the pilot
thereof and an outlet 30 at the opposite end
burner produces a ?ame.
Other objects and advantages will become ap 35 thereof to which the pipe i4 may be threadedly
connected. Between the inlet 28 and the out
parent from the following description taken in
let 30 is a valve seat 32 with which a valve mem
connection with the accompanying drawings,
ber 34 is adapted to cooperate to control flow of
wherein
'
fuel from the inlet 28 to the outlet 30. The
Fig. 1 is a schematic view of a water heater
valve -member 34 is reciprocable toward and
having the safety control of this invention ap
away from the seat 32 by a stem 36 supported in
plied thereto;
the valve body 24 and is biased away from the
Fig. 2 is a plan view of the safety control;
seat 32 by a coil spring 38 extending between the
Fig. 3 is a. section taken on the line III-III of
body 24 and the valve member 34.
Pig. 2;
The valve stem 36 projects through the valve
Fig. 3a is a partial section taken ‘on .the line 45
member 34 into a valve chamber 40_ formed in
Illa-Illa of Fig. 2;
the valve body 24 in communication with the
Fig. 4 is a section taken on the line IV-IV of
inlet 28 and providing an opening 42 in the valve
Fig. 2;
body which is closed by the magnet body 28.
Fig. 5 is a partial section taken on the line
The valve body 24 is also provided with a
50
V-V of Fig. 2;
'
tapered valve seat '44 extending transversely of
Figs. 6 to '10 inclusive are plan and elevational
the inlet 28 and in which a tapered plug valve
views of details of a lever mechanism incor
member 46 is mounted for rotation. The plug
porated in the control;
valve 46 is provided with a port 48 extending
Fig. 11 is a longitudinal section through a
55 transversely therethrough and which may be
modified form of control;
2,405,542
3
4
moved into alignment with the.inlet 28 for pas
sage of fuel to the valve chamber 48. A dial 58
carrying the indicia “On," “Pilot” and “Off” is
supports on one side a coil spring 88 extending
between the armature 84 and the bottom of the
magnet 88. The coil spring 88 is stronger than
the spring 38 for the valve member 34 and acts
in opposition thereto for seating the valve mem
ber ‘34 as will be apparent hereinafter.
The end of the stem 88 projecting on the op
posite side of the armature 84 threadedly engages
secured to a stem 5I projecting from the larger
end of the plug valve 48 exterior of the valve
body 24 and provides manual means for rotating
the plug valve 48 in the valve body to selected
positions.
with a cap nut 98 which is located in valve cham
The larger end of the plug valve 48 is pro
vided with an arcuate groove 52 formed in its 10 ber 48 in proximate relation to the projecting
end of the valve stem 36 with which it is axially
surface and serving injselected positions of the
aligned. The cap nut 98 may beguided in an
valve to connect the opposite ends of a by-pass
apertured retained plate 92 which serves as a clo
passage 54 formed in the valve body and which
the tapered valve seat 44 intersects. One end
of the by-pass passage 54 communicates with the
inlet 28 and the opposite end communicates with
a passage 56 leading to a pilot valve stem cham
ber 58 (Fig. 4) extending axially in a boss 59 on
the magnet body 26 and communicating at one
end with the main valve chamber 48. Recipro
cably mounted in the valve chamber '58 in a valve
stem 68 provided with longitudinal recesses for
passage of fuel from the valve stem chamber-58
into an enlarged pilot valve chamber 82 which
overlies the chamber 58 and connects therewith.
The valve stem 88 has an end projecting into
the main valve chamber 48 and serving to sup
port a sealing device 83 to prevent fuel flow be
tween the main valve chamber 48 and the cham
ber 58. Passage of fuel between the valve stem
chamber 58 and the valve chamber 82 is con
trolled by a pilot valve member 84 secured to
the valve stem 88 and movable into and out of
engagement with a valve seat 88 formed on the
sure for the open end of the enlarged recess ‘I8
and also serves to secure a sealing gasket‘ 94
across the open end to prevent passage of fuel
from the valve chamber 48 into the magnet body
28.
As the voltage generated by the thermocouple
28 is relatively small, the spring 88' will serve to
maintain the armature 84 in its released posi
tion, as shown in Fig. 3, even if the magnet is
in energized condition. As is customary in such
devices, means areprovided for resetting the ar
mature 84 against the pole faces of the magnet
88 by a manual operation owing to the lack of
sufficient magnetizing force to attract it from re
leased position. To this end, a reset stem 96 is
mounted for reciprocation in a reset stem cham
ber 91 formed in the magnet body 26 on one side
of the magnet 88. The reset stem 96 carries a nut
'98 projecting on the exterior of the magnet body
28 and is urged outwardly from the chamber 91
by a coil spring I88. The outward movement of
shoulder intermediate the chambers 68 and 62.
35 the stem is limited by a collar I82 on the reset
_ stem 96 which engages with a flanged portion I83
The pilot valve member 84 is biased into en
of the magnet body 28 forming a guide for the
gagement with its seat 58 by a coil spring 88 ex
stem 98. Beyond the collar I82 the reset stern
tending between the valve member 84 and a cap
projects through an aperture into the valve
‘I8 which forms a closure for the chamber 62.
chamber 48 for the purpose of effecting actuation
Communicating with the chamber 82 is a passage
of- means for resetting the'armature 84 as de
12 formed in the magnet body 28 and leading to
scribed and also to maintain the control valve 34
a connection ‘I4 for the fuel supply pipe 88 of the
seated during the resetting operation.
pilot burner I6. A suitably apertured adjusting
The means for accomplishing this dual func
member ‘I8 for the pilot burner fuel supply may
be mounted for manual rotation in a boss ‘I? 48 tion includes a channel-shaped plate I84, shown
in detail in Fig. 6, which has its base secured to
formed on the magnet body 28 and having an
the magnet body 26 with the opposite sides there
axial opening intersecting the passage ‘I2. Ad
of projecting into the valve chamber 48. A pair
justment of the member ‘I8 which projects ex
of spaced slots I86, I88 are formed in each of the
teriorly of the magnet body serves to vary the
50 sides of the channel-shaped member I84 and a
ori?ce size of the passage ‘I2.
perforation H8 is provided invthe base thereof
As hereinbefore indicated, the valve mechanism
through which the projecting end of the reset
of the present invention is provided with an ar
stem 98 may extend. An operating lever II2,
rangement for causing both the control valve 34
shown in detail in Figs. 8 and 8a, is pivoted inter
' and the pilot burner valve 84 to move to closed
position upon extinguishment of the pilot burner,/55 mediate its ends in the slot I88 and is provided
with a raised portion H4 at one end which en
I6. This mechanism is mounted in the magnet
gages with the cap nut 98 on the end of the arma
.housing 26 which is provided with an enlarged
ture stem 86. The operating lever H2 is further
recess 18 opposite the opening .42 of the valve
provided with an elongated opening H6 within
chamber 48. A magnet 88 is secured in the recess
‘I8 and is of the horseshoe type having the usual 60 which a connecting lever I I8, illustrated in Fig. 9
of the drawings, is adapted to extend.
coils 82 positioned on each leg thereof and con
The connecting lever II 8 has a forked end I 28
nected to receive electric current generated by the
which extends on both sides of the operating lever
thermocouple 28. The thermocouple 28 may
comprise the usual pair of elements of di?erent
H2 at one end I2I thereof, this end being suit
thermoelectric properties which are joined at one
ably bent from the plane of the lever to facili
end to form a hot junction exposed to the flame
tate such engagement. A slot I22 is formed
of the pilot burner I8.
transversely in the end of the connecting lever
In the embodiment illustrated in Fig. 4 the
II8 opposite the forked end I 28 and is adapted
thermocouple 28 is of the tubular type but it
to receive an upturned portion I24 formed inter
will be understood that any other arrangement _
mediate the ends of a holding lever I26 illustrated
. which will provide su?lcient flow of current
in Fig. 10 of the drawings. One end of the hold
through the coils 82 to energize the magnet 88
ing lever I28 is pivoted in the slots I88 of the
may be provided. An armature member 84 is
channel-shaped member I84 and this end is also
provided for the magnet 88 and is carried on a
provided with an opening I28 for the reception of
stem 86 which projects on either side thereof and
the forked end I28 and the associated end I2I
2,485,842
5.
mediate its endsin the slot I 88 of the channel
shaped member I84. the opposite end of this
operating lever will move upwardly causing the
raised portion II4 engaging the cap nut 88 to
of the connecting and operating levers. respec
tively.
I
'
When the lever mechanism described is posi
tioned in the valve chamber 48 the end of the
holding lever I28 opposite its pivot extends along
the underside of the operating lever I I2 and into
operative engagement with the projecting end of
the control ‘valve stem'88. Extending laterally of
the raised portion II4 on the operating lever H2
move the armature 84 toward the pole faces of
- the magnet 88. At the same time. the extended
arm I88 of the operating lever II2 will also move
upwardly causing engagement between the up=
turned end I 82 thereon with the projecting end of
is an arm I88 having an upturned end I82 which 10 the pilot valve stem .88. Thus, when the arma—
ture 84 isin the attracted position in engagement
is adapted to engage with the projecting end of
with- the pole faces of the magnet 88,- the pilot
the pilot valve stem 88 as illustrated in Fig. 4 of
the drawings.
control valve 84 is moved oil’ its seat against the
bias of the spring 88. Fuel may then how past
_
In addition to the features of the safety con
trol so far described, the embodiment of the pres
ent invention includes an arrangement for caus
15 the pilot control valve 84 and from the chamber
82 which it controls to the passage ‘I2 and to the
pilot connection ‘I4 and pipe I8 to the pilot burner
I8 at an amount controlled by the adjustment of
the pilot adjustment member 18. The pilot
water in the water heater I2 becomes excessive.
This arrangement includes means by which it is 20 burner may then be lighted and the ?ame there
from will impinge upon the end of the thermo
possible to move the armature 84 to its released
couple 28 which is connected with the coils 82 of
position and cause closure of the safety control
the magnet 88.
valve 84 independently of the current being
During this resetting operation, the connecting
generated by the thermocouple 20. To this end,
the magnet body 28 is provided with a cover I84 25 lever H8 pivots around the upturned portion I211
of the holding lever I28 as a fulcrum. The hold
within which an expansible and contractible ele
ing lever I28 is thus held stationary against the
ment I 88 of a thermally responsive device is
projecting portion of the control valve stem 88
mounted. Expansion and contraction of the
ing closure of the control valve 84 and the pilot
burner valve 84 when the temperature .of the
element I88 may be made responsive to the tem
while the raised portion I I 4 of the operating lever
I88 is carried on a stud I88 supported from
against the pole faces of the magnet. The reset
magnet body 28. The element I38 is thus free to
expand and contract as described and such move
ments will serve to reciprocate a pin I42 project
ing from the element I88 at the side opposite the
stud I88. The pin I42 projects through an aper
ture in the upper end of the magnet body 88 and
through an axially alignedaperture in the bottom
of the horseshoe magnet 88. The pin I42 is thus
arranged in axial alignment with the stem 88 of
the armature 84 and is adapted for engagement
therewith when the armature 84 is seated against
the pole faces of the magnet 88. In this con
dition of the armature 84 the spring 88 is com
pressed. When the armature 84 is in its released
position the spring 88 is extended and the stem
88 is spaced from the end of the pin I42.
In the operation of the device the dial is first
rotated from the “0i'f" position to the “Pilot"
position. The position of the plug valve port 48
and by-pass groove 82 in the "Off" position is
illustrated in Figs. 12 and 13. Until the “Pilot”
position is reached no fuel can pass the plug valve
48 and both the pilot and main burner control
valves are in closed position. In the "Pilot" posi
tion the fuel may ?ow from the inlet 28 by way
of the arcuate groove 82 to the pilot passage 84
to the pilot valve stem chamber 88. The reset
button 88 is then manually actuated to depress
the stem 88 and cause its engagement with the
of the stem 88 under the bias of spring I88. The
consequent release of pressure on the holding
lever I28, permits the control valve spring 35 to
move the control valve 38 to open position carry
46 ing with it the holding lever I28 which is pivoted
in the slots, I88 of the charmed-shaped support
I84. The dial 88 may then be rotated to the “On”
position shown in Figs. 14 and 15 permitting fuel
to ?ow from the pipe I4 through the inlet 28 to
50 the valve chamber 40 and past the valve seat 32
perature in the water heater I2 by the provision 80 II2 moves away therefrom in engagement with
the cap nut 88. The control valve 84 is thus held
of a capillary tube I88 connected at one end to the
?rmly against its seat 32 against the bias of its
element I88 and at the other end to a bulb I40
spring 88 to prevent fuel flow to the main burner
immersed in the water being heated. The bulb
should the plug valve 88 be positioned with its
I48, capillary tube I88 and element I88 may be
completely ililed with a fluid which remains 85 port 48 aligned with the inlet 28.
In av short time the thermocouple 28 generates
liquid at elevated temperatures such as chiorin
sufilcient current to energize the magnet and
ated diphenyl.
maintain the armature 86 in its attracted position
As shown more clearly in Fig. 3a, the element
an arm I48 mounted on the upper end of the 40 button 88 may then be released causing retraction
- to the oulet 88 connected with pipe id to the
_ main burner I8. In this position of the plug valve
48 it will be observed that the arcuate groove 62
permits fuel to ?ow to the pilot burner through
the same passages as in the "Pilot" position. As
55 the spring 88 of the main control valve 84 is
stronger than the spring 68 of the pilot control
valve the operating and holding levers are main
60
65
tained in raised position and the pilot valve 84
is held open during normal running of the burner.
In the event that the pilot burner is extin
guished. the thermocouple ceases to generate
current causing deenergizatlon of the electro
magnet. Movement of the armature 84 away
from the pole faces of the magnet 80 will then oc
cur.
Such movement of the armature 84 is
caused by the spring 88 which being stronger than
the spring 38 of the control valve 34 moves the
operating and holding levers downwardly about
their pivots and causes closure of the control
connecting lever II8. Furtherpressure applied 70 valve 34 and the pilot valve 84. Thus, when the
to the reset button "88 will cause the stem 88 to
move the forked end I2Il'of the connecting lever
'pilot burner is extinguished for any reason the
safety mechanism operates to close both the
main control valve and the pilot control valve
giving a complete shut~off of fuel to both ‘main
III downwardly carrying with it the associated
end I2I of the operating lever II2.
As the operating lever H2 is pivoted inter 75 and pilot burners.
2,455,542
8
lever I26. The rocker then pivots on its pin sup
port compressing the spring I 64 until the arma
ture 84 is seated against the pole faces of the
quent operation of the safety control described,
magnet 80. The pilot burner may then be lighted
an excessive temperature may occur in the water
being heated in the water heater I2. Upon oc 5 and the thermocouple will generate suilicient cur
rent to retain the armature in attracted position
currence of this condition, the thermal element
while the dial 50 is released. Movement of the
I36 will ‘undergo an expanding action and move
reset stem under bias of spring I52 will relieve
the pin I42 connected thereto toward the arma
the holding pressure of rocker end I60 on holding
turestem 86. As the pin I42 is in engagement with
lever I26 and permit valve spring 38 to open the
the stem 86 in the attracted position of the arma
control valve 34 as in the previous embodiment.
ture, the magnetic force tending to hold the
The following operations to bring the control into
armature against the pole faces of the magnet is
It the burner continues to operate without ex
tinguishment of the pilot burner I6 and conse
running condition are as previously described in
overcome and the spring 88 will move the arma
netic force between the magnet 80 and its arma
ture 84 is thus entirely independent of the cur
connection with the preferred embodiment.
It will be understood that many" changes may
be made in the arrangement and combination of
parts and in the details of construction herein dis
rent generated by the thermocouple 20. It will
be apparent that this positive release of the
without departing from the spirit of the inven
ture 84 to its released position. This action of
the thermal element I36 in overcoming the mag
closed within the scope of the appended claims
armature 84 and consequent closure of the con- 20 tion.
We claim:
trol valve 3| and the pilot valve 64 may occur
1. An electromagnetic device comprising an
under conditions of excessive temperature in the
electromagnet member and an armature member
water heater even though the pilot ?ame has not
movable relatively thereto between attracted and
been extinguished and thermoelectric current is
released positions, means for establishing mag
still being generated.
25
netic force between said members su?icient to
In the embodiment shown in Fig. 11 a modified
maintain said attracted position, and an expan
form of resetting device is disclosed. As the other
sible element operatively engageable with one of
elements of the construction are identical in all
said members and being movable therewith rela
respects with those previously described, similar
reference numerals have been applied to the cor so tive to the other said member upon expansion of
said element to exert a force on said one of said
responding parts. In this embodiment, the plug
valve 46 is provided with stem I44 movable axially
members suf?cient to overcome said magnetic
force and cause movement to said released
thereof and carrying the dial 50. The stem “4
position.
'
and dial are biased from the valve body 26 by a
coil spring I46 extending between the underside 35 2. An electromagnetic device comprising an
electromagnet’having an armature movable rela
of the dial 50 and a cover I48 which limits axial
tively thereto between attracted and released
movement of the valve stem Ill.
positions, means for energizing said electro
The reset stem I50 of this embodiment is lo
magnet to establish magnetic force between said
cated intermediate the plug valve 46 and the mag
net 80 and is mounted in a chamber I5! formed 40 electromagnet and armature suf?cient to prevent
said relative movement, and temperature respon
in the magnet \body26. _ As in the previously de
sive means having an actuating portion opera
scribed embodiment, a coil spring I52 serves to
tively engageable with said armature and being
urge the reset stem I50 outwardly from the mag- .
movable therewith relative to said electromagnet
net body but the reset button of the previous em
bodiment is dispensed with. In place thereof an 45 upon suf?cient variation in temperature to cause
said movement to said released position by over
actuating arm I54 is mounted on the reset stem
I50 exterior of the magnet body 26 and projects
coming said magnetic force.
3. An [electromagnetic device comprising an
I into position to be engaged by the dial 50 upon
electromagnet having an armature movable rela—
axial movement thereof. The opposite end of
the reset stem I50 projects into the valve cham 50 tively thereto between attracted and released
positions, means for biasing said armature to said
ber 40 and is formed'with a cup-shaped end I56
which is preferably rectangular in cross-section.
released position, means for overcoming said
A pin extends transversely through the rectangu
biasing means and causing said movement to
lar end I56 and through downturned ears formed
attractedv position, means for energizing said
on a rocker I58 which takes the place of the con
55
necting lever of the previous embodiment. The
rocker I58 pivots on the pin and is provided with
electromagnet to establish magnetic force be
tween said electromagnet and armature sufficient
to prevent said relative movement from attracted
position, and temperature responsive means hav
ing an actuating portion operatively engageable
> a depending end I60 and an opposite depending
end I62. A coil spring I64 extends between de
pending end I62 and the end I56 of the reset 60 with said armature and being movable therewith
stem. A projection I66 on end I62 of the rocker
relative to said electromagnet upon, sui?cient
is adapted to engage one end of the operating
variation in temperature, said temperature re
lever'II2'Tvhich~rnay»be similar to that described
sponsive means being cooperable with said bias
in the previous embodiment. The opposite end
ing means to cause said relative movement to re
I60 of the rocker is adapted to engage with the 65 leased ' position by overcoming said magnetic
holding lever I26 which also may be similar to
force.
4. An electromagnetic device comprising an
that described in the previous embodiment.
The operation of the embodiment shown in Fig.
electromagnet having an armature movable rela
11 differs from that previously describedv only in
tively thereto‘ between attracted and released
the resetting operation. In the “Pilot” position
positions, means for biasing said armature to said
70
the dial 50 is pushed inwardly toward the valve
releaseiipqsltio?n, means for overcoming said
body by a manual operation and serves to move
biasing means amausing said movement to
the reset stem I50 do
rdlyasvvieweddii’li‘lg.
attracted position, a source of eleEtric current,
means for conducting current from said source to
, vllwl'llhe’prdiection I66 of rocker I58 pivots the
operating lever H2 in support I04 while the de
pending end I60 restrains movement of holding
75
said electromagnet to establish a magnetic force
2,455,042
10
attracted position, a temperature responsive de
vice movable in accordance with temperature
variations, and means for transmitting movement
of said temperature responsive device to said
armature for overcoming said magnetic force and
causing said relative movement to released posi
means to establish a magnetic force sufilcient to
prevent said relative movement from attracted
position, a control device operatively associated
with said electromagnetic means for controlling
flow of fuel to the burner in accordance with said
positions, a ‘temperature responsive device mov
able in accordance with temperature changes
tion by said biasing means.
caused by operation of the burner, and motion
' sumcient to prevent said relative movement from
-
transmitting means extending between said tem
5. An electromagnetic device comprising an
electromagnet having an armature, means for 10 perature responsive device and said armature for
transmitting movement of said temperature re
supporting said armature for movement relative
sponsive device to said armature for mechanically
to said electromagnet between attracted and re
overcoming said magnetic force for effecting said
leased positions, means for biasing said armature
relative movement to released position by said
means carried by said support for moving said 15 basing means.
8. Safety control apparatus for heating appli
armature to attracted position against said bias
ances having main and pilot burners and means
ing means, a source of electric current, means for
for supplying fuel thereto, comprising electro
conducting current from said source to said elec
magnetic means having an armature movable
tromagnet to establish a magnetic force su?lcient
to prevent movement of said armature from at 20 relatively thereto between attracted and released
positions, thermoelectric means responsive to a‘
tracted position, an expansible element mounted
?ame at the pilot burner for energizing said elec
on said support, and movement transmitting
tromagnetic means to establsh a magnetic force
means connecting said element to said armature
sumcient to prevent said relative movement, a
in the attracted position thereof, said element
being adapted upon expansion thereof to exert a 25 control device operatively associated with said
electromagnetic means for controlling ?ow of fuel
force on said armature su?icient to overcome said
to the main burner in accordance with said posi
magnetic force and cause movement of said
tions, and means responsive to temperature
armature to released position by said biasing
to said released position, manually operable
changes caused by operation of the main burner
means.
6. Safety control apparatus for heating appli
30 and operatively engageable with said armature
for movement therewith relative to said electro
magnetic means for effecting said movement to
ances having a burner and means supplying fuel
thereto, comprising electromagnetic means hav
released position 'by mechanically overcoming
ing an armature movable relatively thereto be
tween attracted and released positions, means for
said magnetic force.
VICTOR WEBER.
energizing said electromagnetic means to estab 35
RUSSELL I". GARNER.
lish a magnetic force sumcient to prevent said
relative movement, a control device operatively
REFERENCES CITED
associated with said electromagnetic means for
controlling flow of fuel to the burner in accord
The following references are of record in the
ance with said positions, and means responsive to 40 file of this patent:
temperature changes caused by operation of the
UNITED STATES PATENTS
burner and operatively engageable with said
armature for movement therewith relative to said
Number.
Name
Date
electromagnetic means for effecting said move
2,217,785
Beta et a1. _______ __ Oct. 15, 1940
ment to released position by mechanically over 45 2,285,294
Lange ____________ _- Dec. 9, 1941
coming said magnetic force.
2,273,127
McGoldbrick et al. ___ Feb. 17. 1942
7. Safety control apparatusfor heating appli
2,276,909
2,283,903
ances having a burner and means supplying fuel
thereto, comprising electromagnetic means hav
ing an armature movable relatively thereto be
tween attracted and released positions, means for
biasing said armature to said released position,
means for overcoming said biasing means and
50
Alfery ___________ __ Mar. 17, 1942
Ashcroft _______ __ May 28, 1942
2,288,890
Denison ____-----_....- July ‘I, 1942
2,299,654
Ray _____________ __ Oct. 20, 1942
2,303,701
2,809,709
2,340,234
Manta ..____..-_______ Dec. 1, 1942
Paille _--_._-----..._- Feb. 2, 1948
Thornbery et a1. ----.. Jan. 29, 1944
causing said movement to attracted position, a
2,850,978 source of electric current, means for conducting as 2,301,277
current from said source to said electromagnetic
Alfery ---------__.. J1me 13, 1944
Manta _---.._ ____ -; June 19, 1944
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