US1722991A - Oil burner - Google Patents

Description

Afig.6,'1929. QQBECH 1,722,991

' OIL BURNER n l Filed y 5, 1925 5 Sheets-Sheet 1 ,4 TTORNE).

1929- c. O. BECH 1,722,991

OIL BURiNER i i Filed y 15, 1925 I 5 Sheets-Sheet 2 A TTURNEY.

(I. O. EECH OIL BURNER 1925 5 Sheets-Sheet Original Filed May 15,

4 TTORNE Y.

v paratiyely wide ran of heating c Patented Aug. 6, 1929.

PATENT OFFICE.

CHARLES O. BECK, OF NEW ROCHELLE, NEW YORK.

OIL BURNER.

Qriginal application filed May 15, 1925, Serial 110.

This invention relates to burners and more particularly to fuel oil burners adapted for domestic use, of type shown and described in the pending application for patent filed by me on May 15th, 1925, Serial No. 30,419, and of which this application is a division.

To certain features and phases of my invention not herein claimed, claims are made in my copending application Serial No. 283,481, filed June 7, 1928, which application is a division of said application Serial No. 80319.

One of the objects of the invention is to provide a fuel oil'burner which is particularly adapted for domestic use and which is automatically controlled thereby relieving the user from the almost constant care and attention that so many of the burners now on the market require. 7

Another object of the invention is to provide burner having safety features by means of which the supply of fuel to the burner is automatically cut-off in the event that the pilot light which is intended to burn continuously is blown out by a draft or otherwise, and to keep the fuel su ply cut off until the user or operator has relighted the pilot, and in the meantime has had a chance to examine the burner for other possible defect-s.

Still another object of the invention is to r I 'i" ..A. l n i PLOUQG a domestic burner capaoie oi.

COD]- reason of the increasing or decreasik3 &

A; further obg'ert is to provide a burner in which provision is made for more complete atomization of the air or steam and fuel than is custoinar i and in which the degree of atomization can be easily regulated and controlled. The burner is adapted to burn almost any kind or type of'oil by reason of the fact that the fuel, regardless of its character can be readily atomized. In the event that a very heavy oil is to be used, steam may be substituted for air as anatomizing agent in which case the heat from the steam aids further atomization.

A still further object is to provide a domestic burner which may be adj ustably mounted so that the burner may be easily moved from or into position in front of the furnace whenever it becomes necessary or desirable to clean Serial 2T0. 122,294.

30,419. Divided and this application filed .Tuly 14,

Renewed April 26, 1928.

or inspect either the burner or the furnace. Provision is made so the burner can be moved into or out of operative position without actually detaching the burner, or any of its connections.

Other objects, features, and advantages will appear as the description of the invention proceeds.

In the drawings F i 1 is a view in elevation of a burner and its mountings designed and constructed in accordance with the present invention.

F ig. 2 is a view of a vertical section taken on the line 2-2 of Fig. 8, a portion of the apparatus having been broken away.

Fig. 3 is a View in elevation, partially in section, taken on the line 3-3 of Fig. 1.

Fig. 4C is an enlarged sectional view taken on the line of 41 of Fig. 1.

Fig. 5 is a view of a horizontal View taken on the line 55 of F 8, a portion of the apparatus having been broken away, and

Fig. 6 is a view of a vertical section taken on the line 6-6 of Fig. 1.

Referring to the drawings, 10 represents an oil supply pipe leading to a suitable source of oil supply from which oil is pumped to the burner under a predetermined and variable pressure. 11 represents an air supply pipe which likewise leads to a suitable source of air and from which is pumped to the burner as required. Gas is continuously supplied through a pipe 12 for maintaining a pilot 13 constantly lighted. The air supply pipe 11 and the'gas supply pipe 12 are both threaded at their ends and are screwed into openings in a pipe section 14. The pipe section is formed with a central bore 15 extending throughout aportion of its length and with which the supply pipe 12, when threaded in the opening 16, is in direct and open communication. The air supply pipe 11 enters the pipe section 14- through another opening or port 17 which; connects with an independent and separate longitudinal bore 18 which extends from the port 17 to one end of the pipe section 14. It is understood that the bores 15 and 18 extend through only a portion of the pipe section, 18 terminating at one end of the section and 15 extending almost to the opposite end, the two bores being separated at their inner extremities by the wall 19.

The end of the pipe section 14 throughwhich the bore 18 extends is provided with an annular flange 20 and a depending annular shoulder 21, the upper surface of the annular flange being inclined as at 22. The flange 20 and shoulder 21 are adapted to engage an annular shoulder 23 formed near one end of a T coupling 24, which coupling is provided with circular ports 25 and 26 in its ends and another port 27 intermediate its ends. The shoulder 21 fits into the port 25 and engages the inner face of the shoulder .23 while the flange 20 rests upon the upper .face of the shoulder 23. The T coupling is 'arovided at both ends with annular threaded shoulders and 29 of reduced tuiclrness so. that when the end of the pipe section 14 is fitted into the end of the "5" coupling 24 with the flange 2O resting upon. the shoulder an annular space is provided between the pipe section 14 and shoulder 28. Packing material 30 and a packing gland 31 are placed in this space and a hexagonal securing nut 32 is screwed onto the threaded shoulder 28 thus securing the packing 30 and gland 31 in operating position and forming a swivel connection between the pipe section 14 and the T coupling 24.

The T coupling 24 is formed with a second annular shoulder 33 which constitutes a seat for an annular washer 34. A pipe section which is formed at one end with an annular flanged portion is seated with its flange upon the washer 34 so that the main section of the pipe extends into the chamber in the T coupling 24 between the two shoulders 23 and 33. An externally threaded locking ring 37 is screwed into the end of the l' coupling 24 so as to hold the pipe section 35 securely in position, the locking ring 37 engaging one of the faces of the flange The locking ring 37 is provided with a number of key holes 38 into which a spanner wrench can be secured. for tightening up the ring against the washer.

Another pipe section 39 which is in the term of an elbow is formed and adapted to The rotatably mounted within one end of the T coupling 24. For this purpose the pipe section is formed at one end with an annular shoulder 40 which is adapted to engage the inner face ofthe locking ring 37, and with an annular flange 41 which is adapted to be seated upon the lower face of the locki 7 ring 37. The flange 41 s bevelled as at 42 so as to provide an annular space between the main section of the pipe section and the threaded shoulder 29. Packing material 43 is inserted in this space and a packin and 44 is provided for compressing the gazlring material tightly into the space. A securing nut 45 which is formed with a centrally disposed opening to permit its being slipped on over one end of the pipe section 39 is screwed onto the threaded shoulder 29 to lock the packing gland 44 in efiective position. The opposite end of the pipe section 39 is internally threaded and is adapted to receive the threaded end of the oil supply pipe 10. It will be noticed that the pipe sections 14 and 39 are so mounted as to permit the T coupling 24 and those parts which are rigidly secured thereto to freely rotate while the pipe sections 14 and 39 remain stationary. There is no rigid connection between the T coupling 24 and the pipe sections 14 and 39 so that the T coupling is free to rotate, the shoulders 23 and the locking ring 37 and the flanges 20 and 41, respectively, have contact- '.ng faces which constitute bearing surfaces and insure the free movement of the coupling 24 with respect to the fixed pipe sections.

As has already been pointed out the T coupling 24 is provided intermediate its ends with the opening or port 27. Into this port 27 which is internally threaded is screwed one end of a horizontally disposed air pipe 46 so that the pipe is in open communication with the interior of the T coupling 24 which in turn communicates with the source of air supply through the bore 18 of the pipe section 14 and the air supply pipe 11. The pipe 46 may be of any desired length. The opposite end of the pipe 46 is ernally threaded and is screwed into opening or port 47 in a burner casing 48.

The burner casing 48 is a chambered memher and is formed at one end with a tubular extension or throat 49 or" smaller diameter than the body of the casing. The casing is formed with a horizontally disposed oil delivery tube 50 open at both ends with one end extending through and somewhat beyond the end of the throat 49. The opposite end of the oil delivery tube is of somewhat greater diameter than the rest 01" the tube in order to provide a filter chamber 51. A tubular or cylindrical shaped filter 52 is positioned within the filter chamber 51 and is maintained therein by means of a threaded fitting 53 which extends through the length of the filter and is screwed into the open end of the delivery tube 50 which is, in fact, a port in the wall of the burner casing 48. The end of the delivery tube which extends beyond the end of the throat'49 is formed with an annula flange 54 threaded on its periphery and formed with a plurality ofair ports 55. A tapered oil nozzle 56 having a centrally dis posed orifice 57 is mounted in the end of the delivery tube 50.

Gil nozzles such as 56 having orifices of diflerent sizes are providedso that by a su stitutionot nozzles the flow of oil through the burner may be easily controlled. The nozzles are each formed with a threaded boss through which the orifice 57 extends and by means of which the nozzle is screwed into the end of the oil delivery tube 50. The flat base of the nozzle 57 is adapted to be seated tightly upon the end of the oil delivery tube 50, thus preventing leakage of oil around the nozzle. The periphery of the nozzle is hexed so that a wrench or other tool can easily be applied to screw the nozzle tightly in posithe end of the throat 49 and this end is some what enlarged and is provided with an inter nally threaded annular groove in which packing material 60 is placed, and an annular packing gland 61 is screwed into the end of the nozzle to force the packing into eflective position thus forming a tight seal between the nozzle 59 and the throat 49. When the packing gland 61 is screwed into position the packmg material 60 forms such a tight seal that the control nozzle 59 is held firmly in position against inadvertent change of adjustment. The packing gland 61 and the enlarged end of the nozzle 59 are so formed that a wrench can readily be applied for turning them as may be necessary.

The other or outer end of the control nozzle 59 is formed with an internal annular flange 62 cast integral with the nozzle, the central hole 63 in the flange acting as an adjustable orifice to regulate the air supply. In operation the control nozzle 59 is so adjusted that the tapered face of the oil nozzle 56 partially projects through the central opening 68 in the flange 62 whereby air flowing through the oriflce 63 is caused to converge on the central stream of oil discharged through orifice 57 V and thus brings about a desired atomization.

At a point intermediate the inner and outer peripheries of the flange 62 there is formed or provided an annular groove or recess 64 and a plurality of lateral air ports 65 which extend through the flange and connect the groove 64L with the interior section of the Eontrol nozzle. Thus it will be seen that air entering the burner casing 48 from air pipe 46 passes around the oil delivery tube and through the throat 4-9, then passes through ports and divides, a portion of the air passing throu h the adjustable orifice 63 formed between the tapered face of the oil nozzle 56 and the edge of the annular flange 62, the other stream passing out through the plurality of lateral ports in the annular flange and flowing through the groove 6% on the exterior face of the flange.

A chambered member 66 formed with a threaded annular flange 67 is screwed into the internally threaded outer end of the con trol nozzle 59. At a point intermediate the inner and outer peripheries of theflange 67 there is formed or provided an annular groove or recess (68) and a plurality of lateral air ports 69 which extend through the flange, the groove 68 and ports 69 corresponding generally with the groove 64 and ports 65 in the flange 62 so that air passing through the ports 65 may pass directly through the flange 67 to the outer face of the flange. The body of the chambered member is externally tapered as at 70 and is provided with a centrally disposed orifice 71. The chambered portion of the member 66 constitutes an atomizing chamber wherein a thorough atomization of oil and air takes place.

The chambered portion of the member 66 has a conical shaped dome 72, the apex of i which projects through the flat top thus forming the central orifice 71 with a knife-like edge.

An externally threaded ring 73 is adapted to be screwed into the outer end of the controi nozzle 59 and is formed internally with a tapered face 74 so constructed as to form an outlet between it and the tapered exterior portion of the chambered member 66, the narrowest part of the outlet, due to a diflerence in the degree of angle forming the tapers, being provided at the outer end. By reason of this particular construction my burner can be efliciently run at a relatively low pressure, thus eliminating much of the noise usually caused by combustion in a flame traveling at high speed, and likewise permitting the use of heavier oil by reason of the fact that two separate and distinct streams of air intersect the ejected stream of oil at separated points, one within the atomizing chamber and the other without the chamber, thus providing a double source of air for atomization. If because of the low pressure employed there is any tendency for oil to drip, the conical shaped sheet like film of air passing out through the outer orifice will pick up such oil and carry it along to the fire and provide further and more complete atomization. It will also greatly increase the quantity of air carried into the flre for combustion because of its considerably larger surface area, which through frictional contact with the atmosphere, entrains with it much additional air.

Oil is supplied to the filter chamber 51 through a pipe 76 which at one end is in open communication with the filter chamber. The pipe 7 6 extends through the air pipe 46 and into the chambered portion of the T coupling 24. There the end of the pipe is connected by means of a curved pipe section 77 with the pipe section 35 so that an open line of cbmmunication is formed between the source of oil supply (not shown) and the filter chamber 51. Upon entering the filter chamber 51 the oil passes through the filter 52, then through the oil delivery tube 50, and finally out through the oil nozzle 56 into the atomizing chamber, where it mixes with the air in the manneralready described.

Attached to the bottom of the burner casing 48 is a gas pilot control unit which consists of a chambered housing 7 8 having therein two chambers 7 9 and 80 separated by a wall 81 in which there is a centrally disposed annular and internally threaded hole or opening 82. A threaded plug 83 is screwed into the hole or opening 82. The plug 83 is cored out in one face as at 84 and a plurality of lateral p rts85extend through the plug from the cored out portion to the opposite face. The edge of the core is bevelled as at 86 and forms a seat for a tapered valve 87. The valve is secured on one end of a valve stem 88 which extend through the plug 83 and is threaded at its opposite end to receive an ad ustable nut 89 which can be so adjusted as to provide proper contact with a flexible diaphragm 90- which constitutes a dividing partition between the chamber 79 and the chambered portion of the burner casing 48, or in other words the portion of the burner casing normally filled with air. The spring seat 91 is secured to the valve stem 88 at a point intern'iediate its ends and constitutes a stop for one end of a coil spring 92,,the opposite end of which is seated upon the plug 83. The plug 83, valve 87. stem 88, spring 92, and spring seat 91 constitute a single unit assembly, removable at will. lVhen in operative position the coil spring 92 exerts sutiicient force against the spring seat 91 to normally hold the valve 87 in closed position upon the valve seat 86. An adjustable set screw 93 extends through the bottom of the housing 78 and the end of the screw acts as a stop limiting the downward motion oi the valve 87 as will hereinafter be more fully explained.

The housing 78 is formed with an externally threaded boss 94 which is provided with a longitudinal orifice or opening 95 which extends through the housing and communicates with the chambered portion thereof. The elongated tubular member 13 which is internally threaded at one end is screwed onto the threaded boss 94 and provides a device for furnishing a Bunsen flame to the pilot. Near the threaded end of the member 13 air ports 96 are provided. The housing 7 8 is likewise provided with an internally threaded boss 97, the interior of which is in open connnunication with the chamber through an orifice or opening 98. An elongated tubular member 99. somewhat longer than the member 13 and which is externally threaded at both ends is screwed into the internally threaded boss 97, its op osite end projecting somewhat beyond the irce end of the member 13. A cap 100 is screwed on the free end of the tubular member 99 and is provided with an inclined gas outlet port 101. The cap 100 is screwed into position so that when gas escapes through the outlet port 101 the stream of gas will communicate with the Bunsen flame and the column of flame will then pass upwardly past the nozzle 66 thereby igniting the atomized fuel escaping from the burner. Threaded ports or openings 102 and 103 extend through the wall of the housing 7 8 and intersect the threaded openings 95 and 98. Screws 104 and 105 are screwed into the threaded openings 102 and 103 respectively and serve as means for controlling the passage of gas through the ports 95 and 98. The screws can be turned in sufiicientlyto completely out off the flow of gas through the ports 95 and 98 or may be adjusted so that any desired amount of gas may pass through these ports.

The upper end of the pipe section 14 is exteriorly machined and at its very end there is formed a threaded boss 106. A lateral port 107 extends through the machined portion of the pipe 14 and commimicates directly with the port 15. A T shaped member 108 in which the opposite ports have been machined is slipped on over the machined end of the pipe 14. The T shaped member is formed with an internal annular recess 109 so that regardless of the particular position of the T shaped member 108 the gas entering the port 107 from the port 15 can always pass freely out through the third port of the T shaped member. The boss 106 is not a perfect circle in cross section but has a flattened face, and an annular washer 110.having a centrally disposed opening corresponding in configuration to that of the boss 106 is slipped over the boss, and finally a nut 111 is screwed into position on the boss to retain the washer in posi tion. Thus, it will be seen that while the pipe section 14 remains stationary, the T shaped member 108 is free to turn on the machined end of the pipe, while the washer 110 and boss 106 prevent the T shaped member from slipping oil the machined end of the pipe 14. By reason of the peculiar shape of the boss 106 and the opening in the washer 110 there is no tendency for the washer to rotate as the T shaped member rotates so that once the nut 111 is screwed into position it will remain secure. A gas pipe which is exteriorly threaded is screwed into the third port of the T shaped member 108 and leads to and communicates with the chamber 7 9 within the housing 78. If desired, an intermediate pipe section 113 may be interposed between the pipe 112 and housing 78 and may be wound. once or more times around the air pipe 46 as is clearly illustrated in Figure 1. Thus, it will be seen that gas which is introducet through the supply pipe 12 passes through the bore 15, pipes 112, and 113,'and into the gas chamber 79. It will further be noticed that the machined faces of the T shaped member 108 and the end of the pipe 14 form a swivel connection.

The upper end of the housing 78 is formed with ahorizontally disposed flange 114 which extends a shortdistance out and over the pipes 13 and 99, and extending forwardly th refrom is an extension arm 115. A metal plate 116 is disposed directly beneath the flange 114 and arm 115 and is suitably secured thereto, a sheet of asbestos or other heat resisting material 117 being interposed between before the plate is secured to the arm and flange. On the underside of the flange 114 there is formed a boss 118 to which is pivotally secured at a point nearer one end than the other, a relatively narrow strip of metal 119 the longer end of which extends to and a short distance beyond the side of the flange 114, terminating at that end in an upwardly projecting portion 120 being in substantially the form of a semi circle. Another metallic strip 121, grooved in form and wider at one end than at the other, is rigidly secured to the underside of the forward. end of the extension arm as at 122, while the rear or narrow end is pivotally connected to the short end of the metal strip 119 as at 123. The metal strip 121 is formed of a metal having a suflicient coefficient of expansion so that when heated the metal will become extend-ed to operate the mechanism described. It is apparent that as the forward end of the metal strip is rigidly secured to the extension arm 115 the expansion can take place only in one direction, which means that the rear or narrow end of the strip will move as the metal contracts and expands. As has already been explained, this rear end of the metal strip is secured to the metallic strip 119 which in turn is fulcrumed at 103 and any movement of the strip 121 is consequently transmitted to the strip 119; The pilot light 13 which is directly beneath the metal strip 121 is kept burning continuously and consequently keeps the metal strip hot and in expanded position.

A switch box 124 containing an electricswitch controlled by a lever 125 is suspended on a bracket 126 which is secured to the air pipe 46 and to the gas pipe 112. The bracket .126 not only supports the switch box 124 but lends rigidity to the entire structure. extension arm 127 is soldered or otherwise secured at one end to the lever 125, its opposite end terminating just short of the flange 114. An adjustable screw 128 is mounted in an arm 129 which is formed integral with the flange 114. The screw 128 can be so adjusted that its end and the upwardly projecting portion 120 of the metal strip 119 form a support for the extension lever 127. A weight 130 is positioned upon the extension lever 127 so that if the support is removed from beneath the end of the lever. the weight will tend to throw the switch downward and to break the electrical contact normally maintained in the switch for purposes which will be presently explained. The switch controls an electrical circuit which in turn operates a motor, not shown. The motor operates air and oil pumps, not shown, by means of which air and oil are pumped to the burner.

The operation of the apparatus is as follows: The pilot 13 is kept burning continuously and consequently the metal strip 121 is maintained in heated conditionas long as the burner is lighted. Consequently the strip isnormally in expanded position and acts on the metal strip 119 to force the outer end and having the upwardly projecting portion 120 towards the screw 128 so that the screw and the upwardly projecting portion 120 touch or nearly touch one another. lVith the extension lever 127 supported between the projection 120 and the screw 128' the switch is in closed position and the motor (not shown) is maintained in operation whereby the air and oil pumps are kept operating continuously forcing the oil and air to the burner through the pipes 10 and 11 respectively. If, by accident, the pilot light is blown out or otherwise extinguished, the expansible metal strip 121 contracts and acts upon the strip 119 so as to pull the portion 120 away from the screw 128 suiiiciently to let the weighted lever 127 drop to throw off the switch and break the electrical circuit, thereby stopping the operation of the motor and the pumps. Thereafter the burner cannot be put into operation again until the pilot has been lighted and the lever arm 127 raised and placed in position upon the screw 128 and the end 120 of the metal strip 119.

Assuming that the pilot is lighted and the thermostatic control is properly adj ustcd the motor operates to work the oil and air pumps. Oil is pumped in through the pipe 10 and through the piping which has already been described to the atomizing chamber (36 where it is intermixed with the air which has been pumped in by the air pump, first through pipe 11 and then through the piping described. After the pumps have been started a slight pressure is created in the chambered portion of the burner casing 48 which as has been previously stated, is separated from the gas chamber 79 merely by the flexible diaphragm 90. This pressure tends to force the diaphragm downwardly and in so doing likewise forces the valve stem 88 downwardly and displaces the valve 87 from the valve seat 86. Thus communication is established between the chambers 79 and and the gas which is supplied to the chamber 79 is permitted to flow freely through the ports to the chamber 80 and then through the port 98, pipe 99 and out through the inclined port 101. Passing out through the inclined port 101 the gas becomes ignited by the pilot light 13 and a stream of flame passes upwardly and ignites the atomized gaseous products which are being continuously forced under a slight pre sure from the burner.

A protective casing or shield 131 is removably secured to the flange 114 so as to provide a protection for the pilot light and to prevent excessive draughts of air from blowing out the light. The protective casing also acts as a shield for the pipe 13 and 99.

Apparatus of preferred form and construction has been illustrated and described for the purpose of showing a way in which this invention may be practiced, but the inventive thought upon which this invention is based is broader than the illustrative embodiment thereof and no limitations are intended other than those imposed by the appended claims.

What I claim is:

1. Burner control mechanism in combination with a main burner, a pump for supplying the burner with a combustible mixture and a switch controlling operation of the pump, said mechanism comprising a pilot burner, a housing therefor, a thermostatic plate of substantial length supported in the housing substantially parallel to the pilot burner and receiving heat therefrom a pivotally mounted detent having a short arm connected to the'free end of said thermostatic plate and having a long arm provided with a detent member, a stop, a switch arm normally supported by said detent member and stop, and means normally impelling the switch arm to inactive position whereby in absence of normal heat from the pilot burner the thermostatic plate contracts and withdraws the detent member and releases the i switch arm from said member and the stop.

2. Burner control mechanism in combination witlLa main burner, a'pump for supplying the burner with a combustible mixture and a switch controlling operation of the pump, said mechanism comprising a pilot burner, a housing therefor, a thermostatic plate of substantial length supported in the housing substantially parallel to the pilot burner and receiving heat therefrom, a pivotally mounted detent having a short arm connected to the free end of said thermostatic plate and having a long arm provided with a detent member, an adjustable stop, a switch arm normally supported by said detent member and stop, and means normally impelling the switch arm to inactive position whereby in absence of normal heat from the pilot burner the thermostatic plate contracts and withdraws the detent member and releases the switch arm from said member and the stop.

3. A combined main and pilot burner structure, comprising a main burner body having an air chamber, a pilot burner body having a gas chamber, said bodies being connected together'with open portions of said chambers adjacent, a diaphragm secured between the bodies and separating said chambers, a main burner nozzle, an air supply therefor and an air passage to the main burner from said air chamber, a main pilot burner having gas supply connection with said gas chamber, an auxiliary pilot burner, a second gas chamber adjacent the first named and connected for supply of gas to said auxiliary pilot burner, and a valve controlling supply of gas from'the first named to the second named gas chamber under control of said diaphragm.

4. A combined main and pilot burner structure, comprising a main burner body having an air chamber, a pilot burner body having a gas chamber, said bodies being connected together with open portions of said chambers adjacent, a diaphragm secured be tween the bodies and separating said chambers, a main burner nozzle, an air supply therefor and an air passage to the main burner from said air chamber, a main pilot burner having gas supply connection with said gas chamber, an auxiliary pilot burner, a second gas chamber adjacent the first named and connected for supply of gas to said auxiliary pilot burner, a valve controllin supply of gas from the first named to the second named gas chamber under control of said diaphragm, and a spring normally urging said valve to closed position, the valve normally being held open by air pressure in said air chamber.

5. A combined main and pilot burner structure, comprising a main burner body having an air chamber, a pilot burner body having a gas chamber, said bodies being connected together with open portions of said chambers adjacent, a diaphragm secured b tween the bodies and separating said chambers, a main burner nozzle, an air supply therefor and an air passage to the main burner from said air chamber, a main pilot burner having gas supply connection with said gas chamber, an auxiliary pilot burner, a second gas chamber adjacent the first named and ccnnected for supply of gas to said auxiliary pilot burner, a valve cont-rolling supply of gas from the first named to the second named gas chamber under control of said diaphragm, and an adjustable stop for regulating the amount of opening of said valve.

6. In an oil burner the combination of a switch box containing an electric switch connected to a circuit ontrolling the operation of the devices for supplying oil and air to the burner, the switch having a lever proj ecting to the outside of the box, an extension arm secured to said lever, a weight upon said extension arm, a pilot light burner for the oil burner, a thermostat carried by the burner adjacent the pilot light, and a retaining lever pivotally mounted on the burner and having one end connected to the 5 position by arm, whereupon the Weight can act on the extension arm to operate the switch lever and 10 open the switch.

In testimony that I claim the foregoing as my invention, I have sginecl my name hereto.

CHARLES O. BECH.

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