US1796286A - Heater appliance - Google Patents

Description

March 17', 1931.-

F. A. GAUGER ET AL 1,796,236

HEATER APPLIANCE Original Filed Aug. 1'7, 1921 3 Sheets-Sheet l III INVENTOR. 'arank A.Gauqer By R0; W Johnson AT "NEY,

March 17, 1931. GAUGER ET AL 1,796,286

HEATER APPLIANCE Original Filed Aug. 17, 1921 3 Sheets-Sheet 2 INVENTOR. 'E-Erank lLGauqer By R0 W. Johnston.

March 17, 1931. 'F A. GAUGER ET AL HEATER APPLIANC E Original Filed Aug. 17, 1921 3 Sheets-Sheet 3 i f/l/l/l INVENTOR. v 62 14111! .A. Gauqer Roy W Johnston. BY

AT RNEY.

Patented Mar. 17, 19 3 1 UNITED STATES PATENT OFFICE I a r "FRANK A. GAUGER AND ROY W. JOHNSON, OF MILWAUKEE, WISCONSIN, ASSIGNORS, BY MESNE ASSIGNMENTS, TO-TIME-O -STAT CONTROLS COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF MARYLAND HEATER APPLIANCE Application filed August 17, 1921, Serial No. 493,161. Renewed November 29, 1926.

This invention relates to certain new and useful improvements in heater appliances and, while the same'refers more particularly to that type of heater generally employed for supplying hot water to a household, it may be applied toany type of heater utilizing a fuel burner.

The present type of automatic household heating device is subject to many objections among which are its expensiveness of operation and construction, and the dangers-incidental thereto, in that should the pilot light become extinguished, a manipulation of the fuel control valve'will permit the escape of fuel and as a result he a serious danger to the life and property of the household.-

Hence this invention has for one of its obj cots to provide a device of the class described in which the burner proper will be absolutely disconnected from its course of fuel supply as long as the burner pilot light is extinguishede It is another object of this invention to provide a pilot light arrangement which,

upon the connection of the burner vwith its source of fuel supply, flashes a jet of flame 7 toward the burner.

Another object of this invention isjto provide an improved valve construction disposed inthe burner fuel supply line and so 3 designed and constructed that upon flashing the pilot, the burner will be connected with the fuel supply or, in the event the pilot should be extinguished, a flashing of the pilot will not connect the burner with its fuel supply.

A further object of this invention is to provide a device of the class described so designed and constructed as to be capable. of application to heaters now in use upon drilling of butone hole in the casing wall thereof adjacent the burner, whereby cost of installation'is'reduced to a minimum and the services v of a skilled mechanic eliminated.

A still further object of this invention is to provide a pilot unit including thermostatic means which maintain the pilot supply open as long-as the pilot is'lit and which :closes the pilot supply upon the pilot'being extinguished .whereby a diaphragm valve connected with the burner is restrained from opening movement as long as the pilot is extinguished.

And a still further object of this invention resides in the provision of a single pipe arrangement for controlling the supply of fuel to. a burner, whereby the fuel supply will be positively disconnected from the burner upon extinction of the pilot.

With the above and other objects in view which will appear as the description proceeds, our invention'resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment ofthe herein disclosed invention may be made as come within the scope of the claims.

' In the accompanying drawings, we have illustrated one complete example of the physical embodiment of our invention constructed according to the best mode we have so far devised for the practical application of the principles thereof, and in which: a

Figure l is an elevational view of a water heating system equipped with our improved device;

Figure 2 is a view part in section and part in elevation taken longitudinally through the fluid actuated device and the fuel supply congrolling valve adapted to be actuated there- 3 Figure 3 'isa view part in section and part in elevation taken through the fuel control valve mechanism on the plane of line 33 of Figure 2 Figure '4: is a view part in sectionand part in elevation illustrating the construction of the improved pilot member and the thermostatic means operated thereby;

Figure 5 is a sectional view taken trans versely through the pilot unit on the line 5-5 ofFigure 4.

; Figure 6 is a view similar to Figure 1 illustrating the burner control as independent of-the water supply;

Figure 7 isan enlarged view, part in section and part in elevation illustrating the manner of connecting the control illustrated in Figure 6 with the fuel supply valve, and

Figure 8 is an enlarged detailed sectional -view taken on the line 88 of Figure 7. i

' I Referring now more particularly to the drawings, 6 designates a water tank of any well known construction and having a water supply pipe 7 connected therewith and an Ta'ipipe 12 and its upper end connected with the top of the tank by a pipe 13, and a burnerfue l-supply,by a pipe line 15 provided with outlet pipe 8. leading therefrom, near the top thereof, to a faucet 9. The water in tank 6.

' is heated by a device which maybe of the usual construction comprising an outer casing 10, a watercoil 11 having its lower end connected with the lower portion of tank 6 by 14 so arraiiged'thatdts flames play on the coil. a

The burner 14 is connected with a source of an Improved form of control valve construc- .tion adapted to be operated by the means depicted in Figures land 2 or by the means illustratedin Figures 6 to 7.

The valve. constructionis in the form of a two part casing 16 divided into an upper chamber 17 and a lower chamber 18 by a diahragm 19 carrying. a nippleor valve memer 20 arranged to normally, seat within a I counter-bored boss 21 providing a central outlet for-the lower chamber 18.

of thesection of pipe 15 in direct connec- "tion'with the burner 14' is connected with the chamber 18 outlet.

I The pressure end of the supply pipe 15 is 'connectedwith the lower chamber 18, as best shown in Figure 3, so that the full volume and i pressure of the gasat all times flows therethrough. The chamber 17 is of greater area 7 and volume than chamber 18 and said cham- I. bersareconnected by an adjustable bypass 22,

see Figure 3, whereby, by reason ofthe vari ance of the volume in-the chambers the diaphragm 19 will*'be'.normally urged toward chamber 18 to seat member '20 in the outlet and disconnect the fuel supply from the burner.

' The upper part'of the valve casing is pro.-

vided with abored enlargement 23 in whichisi posltioned an auxiliary, control valve 24 for Y the flow of fuel from chamber'17 toapilot light tip 25, to be later described. --The valve 2,4 is in the form, of an outer sleeve 26; havin 1 its inner end 27 normally slightly spaced from a seat 28 formed within the bore of enlarge? ment'23-whereb'y there'is at all times a slight leakageofxth'e fuel therepast which is con- 'f-ducted to the pilot tip 25 through a port 29 and pipe 30 in order thatasmall'fia-me may be constantly ma ntainedat the pilot tip. I To insure the maintaining, by the diaphragm 19, i n 7 'nqrmal volume 'Qf-fuel supplied to the pilot 'ofth e valve member 20 in closing position, the

- is less than that supplied chamber 17 through x bypass 22.. g

. That portion of, sleeve 26 adjacent port 29 1s annularly channeled and provided withe-a the sleeve central bore.

One endplurality of ports 31 in communicatio n with A valve member 32,

normally held in closing position by a spring I 33, has its stem slidably mounted in the sleeve bore and the outer end thereof has a'push button 34 thereon adapted to be engagedby the stem 35 of a fluid actuated plunger 36, to be later described. The valve'member 24 may I be of any special design and, in the present instance, the one illustrated is similar to that depicted in II. S. Patent No. 1,417,510, granted to us May 30, 1922.

The pilot light unit consists of a casting 37 counterbored to receive a hood or protecting cylinder 38, which is readily removably secured therein by'frictional engagement, and said casting has a securing stem 39, the outer end of which is reduced and threaded, as at 40, for insertion through an aperture 41 made-in the wall of-casing 10, a lock nut 42 making the casting fast. The stem 39 is provided with a bore 43 which is preferablydisposed on a plane slightly above burner 14, see Figure 4. The pipe 30 is connected with a centrally apertured lug or boss 44, in communication with the interior of cylinder 38 to one side of the center thereof and the flow of fuel through the pipe is controlled by a rod 45 having its lower end tapered, as at 46, to provide a valve member audits upper end threaded, as at 47, for readi-lys adjustable connection with a cap 48 mounted on the upper end of a tube 49, the lower end, of which is secured in casting 37, said tube and rod forming a thermostatic device as will be later described. Communieating with the interior of the tube 49,- outwardly of the rod end 46, is a bypass 50 in connection with the pilot tip 25,- which is also enclosed by the cylinder 38, said pilot tip having a jet or flash openingxfil in register with the stem bore 43. I

The pilot tip 25 'is also provided with a top jet 52 of a less area than jet 51, whereby a small flame, as illustrated by dotted linesv in Figure 4, will at all times subject the tube 49 to its heat and, consequently expand the same to free the rod end 46 from. the opening of lug 44. The pilot light is guarded by" a frusto-conical sleeve'or eylinder53 provided in its 'side walls with a plurality of jet apertures 54 one of which registers with the jet 51 and bore 43. The rod 45 is preferably solid and formed of Bessemer steel,

however rod end 46 is' preferably so adusted as to be slightly-off seat when tube '49 is fully contracted; I

v The pipe line 8 leading from tank 6 to the faucet 9 is medially disconnected and has one end 55 thereof connebted with the through an opening in wall 57 of "the casing nearest the valve 16 and has its extreme outer end positioned adjacent cap34, a stufling box or gland '61 surrounding the stem to prevent the leakage of the fluid therepast. With this construction, it will be obvious-that a movement of the plunger 36 from left to right, with reference to Figure 2, will cause stem to engage cap 34 and move valve 32 inwardly to permit an excess flow of fuel g) the pilot, as will be hereinafter describe such-movment of the plunger being yieldably resisted by a spring 62 coiled about stem 35 and confined between wall 57 and the valve head portion or boss 63 of the plunger.

The inlet 56" has a partition 64 dividing,

the same from that portion of the casing in whichthe plunger is mounted and said partition has a large and a small port 65 and 66, respectively, the port 65 communicating with the side of the plunger nearest partition 60 and the porti66 communicating with the other side thereof when the plunger is in its position freeing the port 60 to permit flow of fluid through the casing from pipe section 55 to section 58. The port 65 is of such an area that, when the faucet 9 is fully open, the'flow'of fluid through pipe section 55' will be of such volume as to more than fill said port-area as a result of which the pressure acting on the rear of plunger 36, by reason of the port 66 communicating therewith, will become greater than the force of spring 62 and move the plunger to the right with reference to Figure 2. v

As the plunger moves to the right, th area of port decreases and the pressure thus exerted on the outer face of the plunger is materially increased to apply the extra force necessary to overcome the increased tension of spring 62 as the same is eompressed. The plunger 36 moves against the action of spring 62 until it almost completely closes port 65 and prevents any substantial flow of fluid from one part of pipe 8 to the other and at the same time opens Valve 24 in the manner hereinbefore described to light burner 14.

As long as faucet 9 is fully open, plunger 36 holds valve 24 open and when the operator 1% is of theopinion that the water within tank 6 is sufficiently hot, the faucet is closed. Upon closing the faucet, springs 62 forces plunger 36 to'its normal position and the fluid between the plunger and easing end wall 67 passes through a minute equalizing hole 68 in the plunger and the valve 24 is closed by its spring 33. The operator may then open the faucet to any point up to that wherethe volume of water passing through. pipe 8 is not greater than the area of port 65 to obtain the heated water within the tank.

The operation of'the device is adjustable as wall 67 is in the form of a threaded plug secured in the outer end wall of the casing 57 and carries a threaded stem 68' having its inner end abutting plunger 36 when in its normal position, said stem being provided with a knurled head for convenience in 0b taining instant adjust-ment. I

A stuliing box or gland 70 surrounds stem 68' at its point of passage through the end cap to prevent leakagetherepast. The valve member 16 and casing 57 are readily detachably secured together in proper alignment by a bracket member 71 one end of'Which is secured to the valve casing and the other end to the casing 57.

From the foregoing description taken in connection with the accompanying drawings, it Will be readily appreciated that when plunger 36 is actuated by manipulation of faucet 9, as heretofore described, to compress valve spring 33, a full flow of fuel is permitted from valve chamber 17 to the pilot light, which is materially greater in volume than that flowing through bypass 22 and consequently the pressure within chamber 17 is decreased to a degree less than that in chamber 18 and the diaphragm raised upwardly to register ports 20 of valve 20 with chamber 18 and permit the fu l to flow to the burner. However, should he pilot light be out, tube 49 will have become chilled and contracted to bring the rod end 46 to almost seating position so that the opening of valve 24 will not permit the flow of fuel from chamber 17 through pipe 30 at a rate greater than that through bypass 22, whereby actuation of plunger 36.will not connect burner 14 with the fuel supply through chamber 18.

. In order to insure the necessary supply of oxygen for the burning of the pilot, casting caping from jet 51 burns in a common flame with that escaping from jet 52 to maintain 37 is provided with a plurality of bottom for actuation to light the burner.

tube 49 at a temperature sufficient to insure proper opening of the port 44.

In Figures 6 to 8 we have illustrated the use of our invention inde endent of the water supply actuated means w ere a control memsupply, a burner connected with sand. supher is positioned at some convenient place In this form of our invention the valve 24 is elimihated and an outlet 71 leads from the valve chamber 17 and is connected with an auxiliary control valve 72 by a pipe 73. The valve 72 consists of a casing 74 having an inlet 75 and an outlet 76, a rotatable valve member 77 being operable .to connect and disconnect said inlet and outlet. A handle 78 is carried by'the valve member and provided with a pointer adapted to register with the designation off when the inlet and outlet 75 and 76 are disconnected and with the designation-on when the inlet and outlet are a in connection.

A pipe 79.1eads from the outlet 76 to one H end 'of a passage way 80 formed in a boss '81 on the Valve casing 16 and-to the other end of which is connected the pipe 30 hereinbefore described: The normally constant supply of fuel to the pilot light is obtained by a bypass 82 which leads from the port 71 to the passage way 80,'the'volume of fuel passing through the bypass being controlled by an adjustable needle valve 83.

This f orm of our inventionis substantially thesame as that illustrated in' Figures 1 to 4, in that the volume of the fuel passing from the, chamber 17 to the pilot through pipe 30,

passage 80, bypassv 82 and outlet 71, is less than that'entering chamber 17 throughb pass 22. owever, upon turning handle 8 y to register with designation on pipes 73 and 79 are connected and I the fuel within chamber 17 flows through outlet 71, pipes-73 and 7 9, passage 80 and pipe30 .to the pilot in a volume greater than that entering chamber '1 17 through bypass 22, as a result of which the pressure on the under side of the diaphragm 19 becomes greater than that on the upper side and the valve member 20 raises to permit the egress of the fuel outwardly to the burner From the fore oi'n'g description taken in connection with t e accompanying drawings it-will'be readily apparent to those skilled in E with its supply without being lit.

,What is claimed is:

1. In a device of the class described, a fuel supply, a burner connected with said supply, 1 a valve for controllingthe flow of fuel to the light and means operating substantially fol lowing the flashing of the pilot light to operate said valve to supply fuel to'the burner. 2. In a device of the class described, a fuel ply, a valve for controllingthe How of fuel to the burner, a pilot light, a pilot light valve normally maintaining a minimum volume of fuel to the pilot light and adapted upon'actuation to supply an increased volume of fuel thereto and flash the pilot light, and fluid actuated means for simultaneously actuating the pilot-light valve to flash said light an operating said first-named valve to supply fuel to the burner.

3. In a device of the character described,

a fuel supply, a burner connectible with said supply, a valve controlling the flow of fuel to the burner, a pilot light, means supplying a minimum volume of fuel to the pilot light,

a normally closed valve adapted, upon open: ing movement, to supply an increased volume of fuel to the pilot, and means operable by the increased volume of fuel passing through said second mentioned valve upon the opening thereof to open the first-mentioned valve and connectthe burner with the fuel supply.

4. In a device of the character described, a fuel supply, a burner connectible with said supply, a valve controlling the flow of fuel to the burner, a pilot light, means supplying aminimum volume of fuel to the pilot light,

a normally closed valve adapted, upon opening movement, to supply an increased volume of fuel to the pilot, means operable upon opening of said second mentioned valve to open the first mentioned valve and connect the burner with the fuel supply, and means preventing opening movement .of the firstnamed valve while the pilot light is extinguished.

5. In a device of the class described, a control valve positioned within a fuel supply for controlling the'flow of fuel to' a burner, said valve comprising a casing, a diaphragm.

dividing said easing into two chambers into one of which said fuel supply discharges, an outlet leading from said last mentioned casing chamber, a valve member carried by said diaphragm. for controlling said outlet, a bypass connecting said casing chambers whereby the pressure on the side of the dia-' phragm remote from the chamber into which the fuel supply discharges will be greater than that on j-the other sidethereof to norlight for thelburner, meansconnecting said "pilot light with the'chamber on'the side of m'ally maintain said outlet closed, a .pilot ing the supply of fuel to the pilot light. to a volume greater than that passing through said bypass whereby the pressure on the side: of the diaphragm with which the pilot light supply is connected is decreased to an amount less than that on the other side of the diaphragm-to permit openingof the fuel outlet. j

6. 'In a device of the class described, a control valve positioned within a fuel supply for controlling the flow of fuel to a burner, said Valve comprising a casing,'a diaphragm dividing said casing into two chambers into one of-which said fuel supply discharges, an outlet leading from said last mentioned casing chamber, a valve member .carried by said diaphragm for controlling said outlet, a bypass connecting'said casing chambers whereby the pressure on the side of the diaphragm remote from the chamber into which the fuel supply discharges'will be greater than that on the other side thereof to normally maintain said outlet closed, a

pilot light for the burner,- means connecting said pilot light with the chamber into which the fuel supply discharges whereby a normal supply of fuel of less volume than that passing throu h said bypass is furnished the pilot light, and means for increasing the supply of fuel to the pilot light to a volume greaterthan that passing through said bypass whereby an increased amount of fuel is supplied to the pilot light to flash said light to play on said burner and the pressure on [the side of the diaphragm with which the pilot light. supply is connected is decreased to an amount less than that on the other side of the diaphragm to permit openingof the fuel outlet.

7 J Ina device of the class described for lise sh the sametoward the burner,a thermostatic member controlling the supply of fuel to the pilot light and adapted upon extinction of the pilot light to substantially shut the said supply means, a'common guard housing for said pilot light and thermostatic memher, and a sleeve mounted within said housing and surrounding the pilot light to shield the same.

8. Inadevice of the class described, a pilot light, means for constantly supplying a nor-. mal amount of fuel to the pilot light, means for supplying a greater amount of fuel to the pilot light to flash the same toward a burner, said pilot light having a jet opening in its tip and a jet opening in the side thereof, and a frusto-conical member surrounding said pilot with its reduced open end aligning with the jet opening in the ti of thepilot and the opening in the side t ereof communicating with the jet opening in the side of said pilot a from which said pilot flashes.

9. In a device of the class described, a pilot tip having ajet opening in its top and a jet opening in the side thereof with its axis at right angles to the axis of the top jet opening, said side jet opening being of greater area than said top jet opening, means for supplying a normal amount of fuel to said pilot tip whereby a constantly burning pilot flame will be maintained, the'fuel escaping from said side jet opening passing upwardly to burn in a common flame with the fuel escaping from said top jet opening, and means for supplying a reater amount of fuel to the pilot tip where y a jet of flame will be flashed from said side jet opening by reason of the same being of greater area than said top jet opening.

10. In a device of the class described, a pilot tip having a jet opening in its top and a jet opening in the side thereof, said side jet opening being of greater area than said top jet opening, mal amount 0 fuel to said pilot tip whereby a constantly burning pilot flame will be maintained, the fuel escaping from said jet opening passing upwardly to burn in a common flame with the fuel escaping from said top jet opening, means for supplying a greater amount of fuel to the pilottip wheremeans for supplying a nor-' by a jet of flame will be flashed from said side jet opening by reason of the same being of greater area than said top jet opening, anda casting including a base and a tubular stem part, a fuel supply passage leading into'the base and having its end therein counterbored to provide a valve seat, a tube having a comparatively high coefiicient of expansion, the lower end of said tube being secured to the base with its bore in register with the counterbored part of, said fuel supply, a rod carried by said tube andpositioned therein, said rod having a relatively low coefficient of expansion and the lower end thereof engaging sa1d valve seat when said tube is contracted to close the fuel supply, a pilot tip mounted on the base, and a bypass connecting the pilot tip with the fuel supply at a polntabove the valve seat, the-pilot, when lit heating the tube to expand theisame, the end of sa1d rod being held free of the valve seat when the tube is expanded, said tubec'ontracting upon extlnction of the pilot light to engage the rod end with the valve seat to disconnect the pllot from the fuel supply. I

12. In a device of the character descrlbed, a casting includin a substantially cup-shaped part and a tubu ar stem part, the bore of in register with the counterbored part of said fuel supply, a rod carried by said tube and positioned therein, said rod having a relatively low coefficient of expansion and the lower end thereof engaging said valve seat when the tube is contracted to close the fuel supply, a pilot tip mounted in said cup shaped portion, a bypass connecting the pilot tipwith the fuel supply at a point above said valve seat, the pilot,'when lit-,heating the tube to expand the same, the end of said rod being held free of the valve seat when thetube is expanded, said tube contracting upon extinction of the pilot light to engage the rod end with the valve seat to disconnect the pilot from the fuel supply, and a. guard carried by the cup-shaped portion of the casting and enclosing said tube and pilot.

13. In a device of the character described, a casting including a base and a tubular stem part, a fuel supply passage leading into the base and having its end therein counterbored to provide a valve seat, a tube member having a comparatively high coefficient of expansion, the lower end of said tube being secured to the casting with its bore in register with the counterbored part of the fuel supply, a rod carried by said tube and positioned therein,

said rod having a, relatively low coefficient of expansion and the lower end thereof engaging said valve seat when the tubeais contracted to close the fuel supply, a pilot tip mounted on the base, and a' bypass connecting the pilot. tip with the fuel supply at a point above said valve seat, the pilot, when lit, heating the tube to expand the same, the end of said rod being held free of the valve seat when the tube is expanded, said tube contracting upon extinction of the pilot light toengage the rod end with the valve seat to disconnect the pilot from the fuel supply, said pilot tip having a jet'opening 1n its side registering with the bore of the tubular stem and a jet openingin its top'whereby a jet of flame is played on the thermostat and through said tubular stem to ignite a burner.

14. In a device of the character described, a casting including a substantially cupshaped portion and a tubular stem part, the bore of which communicates with the interior of the cup-shaped portion, a fuel supply passage leading into saidcup-shaped portionv and having its end therein counterbored to provide a valve seat, a tube having a comparatively high coefficient of expansion, thelower end of said tube being secured to the casting with its bore in register with the 'counterbored part of the fuel supply, a rod ing inits carried by said tube and positionedtherein, said rod having a relatively low'coeflicient 'of expansion and thelower end thereof en-' gaging 'said valve seat when the tube is contracted to close the fuel supply, a pilot tip mounted in said cup-shaped portion a bypass connecting the pilot tip with the fuel supply at a point above said valve 'seat, the

pilot, when lit heating the tube to expand.

the same,

fuel supply, a guard carried by the cupshaped portion of the casting and enclosing 1 said tube and pilot, said pilot tip having a jet opening in its side registering with the bore of the*tub ular stem and a jet openis played on the thermostat and through the tubular stem to play on a burnerto. be ignited and a frusto-conical shield within said guard having an aperture in'its side wall thereofin register with the jet opening in the side of the pilot tipand an opemng in its side to'permit the pilot to burn through the jet openingin the top thereof.

15. In a .heatlng system of the class idescribed, the combination of a water receptacle having an outlet valve and fuel burners adapted to heat. thefcontents of said receptacle, a source of fuel supply for said burners, a valve controlling thesupply of fuel to the burners, 'a pilot light, means for su'p-' plying a minimum volume of fuel to the the endof said rod being held free of the'valve seat when the tube is expanded, I

top whereby a jet of flameslight, said outlet valve adapted upon ppening movement to control the supply of an increased volume of fuel to the light, and

means operable upon the opening of the first-mentioned'valve to open the second I mentioned valve and connect the burner with theifuel supply.

16. In a heating system of the class described, the combination of a water receptacle having an outlet valve and fuel burn-- ers adapted to heat the contents of said re ceptacle, a source of fuel supply for said burners, .a valve controlling the supply of fuel to the burners, a. pilot .light',.means for supplying'a minimum volume of fuel to the light, means operable upon the opening movement of the outlet valve'to increase the "volume of fuel; to the pilot light second means operable upon the opiling of and a.

the first mentioned valve to open the secondmentioned valve and connect. the burners with the fuel supply.

17 In a system of the character described, a main burner, a'm'ain supply linetheref'or, a main valve in the supply line, a pilot burner, a control valve, thermdstatic means associated with the pilot burner for operat- 7 ing said control'valve and means operable in accordance with the opening and closing of said control valve for opening and closing the main valve.

18. In a system of the character described, a main burner, a supply line therefor, a main valve in said supply line, a control valve remote from said main valve, a fluid pressure motor for controlling the position of said main valve and connections between said remote control valve and said fluid pressure motor for causing a' variation in pressure in the motor and thereby actuating the same upon the opening and closing of said remote control valve.

19. In a system of the class described, a main burner, a supply line therefor, a main valve in said supply line, a control valve, means operable in response to variations in gas pressure for operating said main valve and connecting means between said pressure operated means and said control valve for causing variations in pressure in said pressure operated means in accordance with movement of said control valve.

20. In a system of the class described, a main burner, a main valve controlling the supply of fuel to the burner, a pilot burner for igniting the main burner, a pilot valve independent of said main valve for controlling the supply of fuel to the pilot burner, a thermostat for operating said pilot valve, said thermostat being associated with said pilot burner to be influenced by heat pro duced thereby and so isolated as to be substantially unaifected by heat produced by combustion at the main burner and means for operating said main valve upon the operation of said pilot valve.

In testimony that we claim the foregoing we have hereunto set our hands at Milwaukee, in the county of Milwaukee and State of Wisconsin.

FRANK A. GAUGER. ROY W. JOHNSON.

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