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Патент USA US2409393

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w. A. RAY
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42,409,337 -
CONTROL DEVICE
Filed Féb. 15. 1943
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WILQAM AADAY.v
Gttornég.
Patented Oct. 15, 1946
2,409,387
UNITED STATES PATENT OFFICE
2,409,387
CONTROL DEVICE
William A. Ray, Los Angeles, Calif., assignor to
General Controls 00., a corporation
Application February 15, 1943, Serial No. 475,859
3 Claims.
1
(Cl. 200—138)
My present invention relates to condition-re
sponsive control devices, such as thermostats,
pressurestats, or the like, and has for an object
the provision of a pair of such devices, mounted
one upon, the other, having unitary means for
connecting the respective devices to apparttus to
.be controlled by them. This application is a con
2
ation, even although the electrical device would
then be inoperative.
Other objects and advantages of the invention
will be' found in the description, the drawing, and
the claims; and, for full understanding of the
invention, reference may be had to the following
detailed description and accompanying drawing,
tinuation-in-part of my copending application,
Serial No. 385,719, ?led March 28, 1941.
wherein:
Figure 1 is a lo-ngtiudinal'sectional view of
Another object is to provide an arrangement,
of the character described in the preceding ob
ject, wherein one of the devices has a portion
extended for connection to a relatively remote
apparatus to be controlled, such as a valve or
switch; the other of the devices being of the 15
condition-responsive apparatus embodying my in
vention shown by way of example, connected to
control the operation of a gas heating system
Figure 2 is a fragmentary transverse section
taken along the line 2—2 of Fig. 1.
trical conducting means which forms a unitary
part of the extended portion of the ?rst-men
shown in the lower portion of Fig. 1, the numeral
ll indicates a main' burner which is connected
electric-circuit-controlling type and having elec
illustrated in diagram; and
I
Referring ?rst to the burner control system
tioned' device.
by a conduit I2 to the outlet l3 of ,a ?uid pres
A more speci?c object is to provide an arrange 20 sure operated valve generally indicated at I4.
ment, of the character described in the preceding
Connected in series with and ahead of valve I4
object, wherein one of the devices is of the tem
is another valve [5 of the rotary plug type, to
perature responsive type and comprises a ther
the inlet of which is connected an electromag
mal bulb having a capillary tube portion extended
netically controlled safety valve generally indi
“
for connection to relatively remote ?uid pressure 26 cated at 16.
The valve 14 comprises a casing l‘l having an
operated means to be controlled; the other of
the devices, of the electric-circuit-controlling
opening in its top wall which is closed by a flex
type, having conducting means which forms a
ible diaphragm l8. Securing the diaphagm to
unitary part of the capillary tube of the ?rst
the casing, and providing a pressure chamber
30 thereabove, is a housing I9. Extending from a
mentioned device.
Another object is to provide, in an arrangement
pressure plate 20, secured to the underside of the
diaphragm, is a stem 2| which is pivoted at its
of the character described in the preceding ob
jects, means for automatically connecting the
electric-circuit-controlling device to the conduct
ing means upon mounting of the devices one
upon the other. By providing (1) conducting
means for the electrical device, which means
forms a unitary part of the extended portion or
capillary tube of the other device, and (2) means
lower end on an intermediate portion of an arm
22. This arm is pivotally mounted at one of its
ends on a pin 23 secured to the casing. Pivotally
connected to another intermediate portion of arm
22 is a stem 24 for a closure member 25, which
closure member is cooperable with a Valve seat
26 provided in the bottom wall of the casing. A
spring 21, compressed between a side wall of the
for automatically connecting and disconnecting
casing and the free end of arm 22, is arranged
the electrical device to and from the conducting
to e?ect snap-action of the closure member in
means when the devices are respectively united or
its opening and closing movements as arm 22
separated-the possibility of failure of the in
moves
past center. So that this snap-action may
staller to make or break such connection is ob 45
be fully effective, the upper and lower portions
viated. This is of particular importance when
of stem 2| are interconnected by a lost-motion
the electrical device is of the normally closed
device
49. Urging the diaphragm and the clo
circuit type and is employed as a safety or high
sure member upward, is a compression spring 28.
limit control, and hence failure to break the con
The safety valve It comprises a casing 29 hav
nection upon removal of the other device would 50 ing a ported partition 3t providing a valve seat
permit the establishment of an unsafe condition.
31. Cooperable with this seat is a closure mem
Likewise, if the electrical device is of the nor
ber 32 mounted on a rod 33, the free end of which
mally open-circuit type, failure to make the con
sealingly extends through a side wall of the eas
nection when the devices are assembled would
ing and is provided at its outer end with a com
not be apparent under normal conditions of oper 55 pression spring 34 which urges the closure mem
2,409,387
3
4
ing a sleeve 84 of woven wire which is electri
her 32 toward its seat. Mounted in the safety
cally insulated from the capillary tube by a sleeve
valve casing 29 is an electromagnet 35 compris
65 of rubber or other suitable material. Molded
ing a U-shaped core 36 which carries on one of
on the outer end portion of the thermal bulb,
its arms an energizing coil 31.
Mounted on the stem 38 of the plug valve is a C1 and surrounding the adjacent end of the capil
lary tube, is a head 65 of insulating material such
cam 39 which, in the rotation of the plug valve,
as Bakelite. Carried by this head is a pair of
is adapted to engage the outer end of rod 33 and
connector pins 51 which are cooperable respec
thereby move the closure member 32 away from
tively with the female connectors 80 and Bi and
its seat and into engagement with the pole faces
extend through suitable openings in cap 62; the
of the electromagnet core 35. The closure mem
pin which cooperates with the insulated connec
ber 32 is constructed wholly or in part of mag
tor So being connected by a wire 68 to the con
netic material so that when it is brought into
ducting sleeve 64, the other pin which cooperates
engagement with the core, while the same is
with the grounded connector 6| being connected
energized by passage of current through coil 31,
by a wire 69 to the capillary tube 53. By the ar
the closure member will be magnetically retained
rangement described, the thermostatic control de
in open position against the bias of spring 34.
vice constituted by the bimetallic member 48 is
The electromagnet 35 is so designed that the clo
automatically connected to the conducting means,
sure member is magnetically held only when it is
comprising sleeve 64 and capillary tube 53, when
?rst brought into engagement with the core, no
the thermal bulb is mounted on the ?tting 43.
attraction of the closure member through space
being contemplated. It will be noted that the
cam 39 is so arranged with respect to the plug
For the energization of the electromagnet 35,
there is provided a thermoelectric generating de
vice 10 comprising a pair, or plurality of pairs,
valve that the same is closed when the safety
of thermocouple elements contained within a pro
valve closure member is moved to its open posi
tecting sleeve 1|. The upper, or “hot junction”
tion. The general combination of plug valve and
end of this device is arranged to be heated by
safety valve, shown herein, is disclosed in Patent
the flame of a pilot burner 12 mounted on the
No. 2,297,718 granted to me October 6, 1942.
Referring now to the upper portion of Fig. 1
main burner ll, for the ignition of which it also
serves; the pilot burner being connected by a
and to Fig. 2, there is shown, mounted in a wall
45 of a boiler 46 heated by the main burner H, 30 pipe 11 to the outlet of the safety valve (6. One
lead of the thermoelectric generating device is
a combination thermostatic control device which
comprises a cylindrical thermal bulb 41 and a bi
connected by a wire 13 directly to one terminal of
metallic member 48. The thermal bulb is mount
the electromagnet coil 31; the other lead of the
ed in the boiler by means of a ?tting 49 threaded
device being connected by a clamp 14 to the
in a nipple 50 welded in an opening through the
capillary tube 53, and the other terminal of the
coil by a wire 15 and clamp 16 to the conducting
boiler wall; a gland nut 5|, threaded in the outer
end of the ?tting and closely surrounding the
sleeve 164. By these connections, the energizing
bulb, being provided for the compression of pack
circuit of the electromagnet is placed in series
ing material 52 which serves to sealingly hold the
with the contact members 56-51 of the bimetal~
bulb in position. The thermal bulb, the outer
lic thermostatic device, these members being in
end of which is ?uidly connected by a capillary
continuous engagement at all normal operating
temperatures of the boiler.
tube 53 to the valve housing I9, is of conventional
type, being of metal of high thermal conductivity
With the parts in the positions shown in the
and containing a volatile ?uid which, upon pre
drawing, fuel supply to both the main burner
determined rise of temperature of the boiler
H and the pilot burner 12 is obstructed by the
water, expands and thus produces a pressure
safety valve closure member 32. To initiate op
within housing l9 above the diaphragm is suiii
eration of the system, the plug valve 15 is ro
cient to move the same downward against the
tated from its open position, as shown, to a closed
bias of spring 28 so that the closure member 25
position wherein engagement of cam 39 with the
is brought into engagement with its seat.
50 end of rod 33 moves closure member 32 away
The bimetallic member 48 is curved on an are
from its seat and into engagement with the pole
substantially concentric with the thermal bulb
faces of core 36, whereupon fuel can ?ow through
and is secured at one end to a boss 54 provided
pipe 11 to the pilot burner 12 where it is lighted.
on the outer end portion of the ?tting 49 so that
The plug valve is manually retained in safety~
it is in good heat-transfer relation to the bulb—
valve-opening position until the thermoelectric
the ?tting 49 being of material having high ther
device 19 has become sufficiently heated by the
mal conductivity, such as brass. Insulatingly se
pilot burner flame to generate current in an
cured to the free end of the bimetallic member
amount sufficient to cause the electromagnet to
is a short metallic strip 55 which carries an ad
hold the armature-closure member 32 in the po
justable contact screw 5'5 cooperable with a ?xed (ii) sition shown by the broken lines, When this
contact member 51 secured to another boss 58
occurs, the plug valve may be returned to its
formed on the outer end portion of fitting 49; the
open position, fuel then passing to the automatic
contacts 56 and 51 being in continuous engage
valve i4 which, if the water in the boiler is rel
ment under normal conditions. The contact
atively cold, will be
open position on account
screw 56 is electrically connected by the strip 55
and a wire 59 to a female electrical connector
60 insulatingly mounted on the flange portion
of ?tting 49; a similar female connector 6|,
mounted directly on an adjacent portion of the
?tting ?ange, serving as electrical connecting
means for the grounded contact member 51. En
closing the bimetallic member is a cap 62 which
is attached to the ?tting 49 by three screws 53.
Around the capillary tube 53 of the thermal
bulb 41 is electrical conducting means compris
“ of the contraction of the ?uid in the thermal
bulb 41.
Fuel can therefore then flow to the
main burner H where it is ignited by the pilot
burner ?ame. When the temperature of the
boiler water reaches a predetermined degree, the
pressure of the fluid in the thermal bulb, ap
plied to the diaphragm l3, effects closure of the
automatic valve and hence extinguishment of the
main burner. Upon resultant cooling of the wa
ter, the automatic valve reopens under the force
75 of spring 28 due to reduction of ?uid pressure
2,409,887
5
above the diaphragm; recycling of the valve
maintaining the temperature of the water be
tween predetermined limits.
If, due to faulty operation of the automatic
valve or its control means, or from other causes,
6
invention does not depend entirely upon the pro
vision of the separable connectors 60—6| and 61,
since, if manually connectible means, extending
between the bimetallic unit and the conductor
means 64, 53, were substituted therefor, these
connections would have to be broken in order to
remove the thermal bulb. Obviously, other
the temperature of the water rises to an abnor
mal degree, resultant outward warping of the bi
means could be provided for eii’ecting the safety
metallic member 48 effects disengagement of the
disconnection, such as for instance means car
contact. members 56—51 and thereby deenergi
ried by the thermal bulb and cooperating me
zation of electromagnet 35. The safety valve clo
chanically with the bimetallic member.
sure member 32 is thus permitted to return to its
While I have herein shown and described a
seat under the force of spring 34. Fuel ?ow to
speci?c embodiment of my invention, I wish it to
both the main and the pilot burner is therefore
be understood that modifications may be made
obstructed and the system must be “manually
reset” as described above in order to reinitiate 15 without departing from the spirit of the inven
tion, and that I intend therefore to be limited
operation after the cause of the failure has been
only by the scope of the appended claims.
corrected. The bimetallic member, being in inti
I claim as my invention:
mate thermal contact with the ?tting 49 and in
1. In combination: a ?rst temperature-respon
sulated from the surrounding atmosphere by the
sive control device comprising a thermal bulb
cap 62, is at all times substantially at the tem
having a metallic capillary tube extending there- perature of the boiler water. By the angular ar
from for connection to relatively remote ?uid
rangement of contact member 51, a wiping action
pressure operated means to be controlled by the
occurs in the relative movement of the contacts.
device, a second temperature-responsive device
An additional safety feature is provided by the
pilot-burner-heated thermoelectric generating 2.5 adapted to control an electric circuit and mount
ed on said thermal bulb in good heat-transfer
device. If the pilot burner should be accidentally
relation thereto so that both of said devices are
extinguished, upon cooling of the thermo-electric
substantially equally thermally affected, and a
device the resultant cessation of current genera
pair of electrical conductors for connecting said
tion effects deenergization of the electromagnet
and the safety valve closes.
30 second device in said circuit, one of said electri
cal conductors being formed in part by'said cap
If for some reason the thermal bulb is removed
illary tube and the other comprising an element
from the ?tting, the electrical circuit of the bi
insulatingly supported by the tube.
metallic thermostatic device is automatically bro
2. The combination de?ned in claim 1 wherein
ken, thereby effecting release of the safety valve
closure member 32 to closed position. If such au-, 35 said other of said electrical conductors comprises
conductive material encircling said capillary tube
tomatic disconnecting means were not provided,
and electrically insulated therefrom.
and if one were to fail to‘ break the circuit of the
3. The combination de?ned in claim 1 wherein
safety valve in some other way, upon cooling of
_ said other of said electrical conductors comprises
the thermal bulb the valve 14 would open and
heat would be supplied to the boiler, with the pos 40 a sleeve of woven wire encircling said capillary
tube and electrically insulated therefrom.
sibility that the same would be damaged, since
the water would then be below the level of the
WILLIAM A. RAY.
thermostat ?tting. This safety feature of the
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