US1762868A - Oil burner - Google Patents

Description

6 Sheets-Sheet `'une 10, 1930. A. KAIS oIL BURNER Filed oet. 3, 1927 A. K Als OIL BURNER June 10, 19,30.

Filed Oct. 3, 1927 6 Sheets-Sheet 'June 1o, 1930.

A. KAls 1,762,868

OIL. BURNER Filed oct. 3, 1927 @sheets-sheet 5 cg G June 10, 1930. A. KAls OIL BURNER Filed oct. s, 1927 6 Sheets-Sheet June 10, 1930. A. KAIS 1,762,868

y OIL BURNER Filed Oct. 3, 1927 6 Sheets-Sheet 6 liatentcd June l0, i930 trazas@ 'ATaNT Trice ACHILLE KAIS, 0F DETROIT, MICHIGAN OIL :BURNER Application led October 8, 1927. Serial No. 23,742.

This invention relates to oil burners and more particularly to a, novel construction and arrangement of parts tending to simplify, render more eiiicient, and improve the same generally.

y The invention has as one of its primary objects to provide a comprehensive and com plete automatically controlled mechanism functioning under every condition and emergency which may arise to fully control the burner. To this end the invention contemplates the provision'of mechanism and means operating to shut off the burner irrespective of the operation of the thermostat usually arranged in the room or chamber to be heated. Furthermore, they invention contemplates the provision of means and mechanism for controlling the burner upon theattainment of too great a steam pressure in the bolier; when the water supply in the boiler has fallen below a redetermined amount; or when the oil in t e burner has failed to ignite and oil kis accumulating owing to the fact that the oil supply has not been shut olf. y

In addition the apparatus vshown and described herein contemplates the provision of means for automaticallyl regulating the supply of air furnished to the burner particularly at each commencement of operation of the burner. This structure likewise provides means for automatic-ally igniting the fuel fed to the burner and for controlling the burner igniting circuit so as to'effect an economy in the power which it requires.

While with the structure about to be described the normal control of the burner is automatic and operates in dependence upon the operation of an electrically con- 40 trolled device, nevertheless this linvention contemplates the provision of means for positively mechanically controlhng the flow of oil to the burner upon failure of the thermostat; upon the attainment of a predeter- '45 mined steam pressure; upon the lowering of the water in the boiler or upon -an accumulation of oil in the burner.

In addition to the automatically controlled features generally referred to hereinbefore1 50 this invention contemplates novel details of the fuel control valve and the loperating construction, combinations, and arrangements of parts tending to simplify the construction, cheapen the cost of manufacture and facilitate assembly and upkeep.

The several objects, advantages and novel details of construction of the invention will be made more a parent -as this description proceeds, especia ly when considered in connection with the accompanying drawings wherein: y

-Figure* l is a side elevational view of a ,furnace and an automatic oil burner eonstructed in accordance with my invention;

Figure2 is anenlargedffragmentary side elevational View of the main control mechanism illustrated in Figure l;

Figure 3 is a top plan view of the structure illustrated in Figure-2; i

Figure 4 is a fragmentary sectional elevational viewl taken substantially on the plane 7% indicated by line 4--4 in Figure 3;

Figure 5 is a fragmentary sectional elevational view taken substantially on the planev indicated by line 5 5 in Figure 3;

Figure 6 is a detail sectional view taken substantially on the plane indicated by line 6-6 in Figure 3;

Figure' 7 is a vertical sectional view taken substantially on the plane indicated by line 7-7 in Figure 3 showing the safety switch mechanism Figure 8 is a detail sectional view taken substantially on the plane indicated by line 8-8 in Figure 3 showing the heating element control switch; 95

Figure 9 is a fragmentary vertical sectional View taken substantially on the plane indicated by line 9-9 in Figure 3 showing mechanism therefor;

Figure l() is a plan view of the burner showing the ignition element associated therewith;

Figure 11 is a fragmentary sectional view taken substantially on the plane indicated by line ll-ll in Figure 10; l

Figure l2 is a fragmentary detail sectional view taken substantially on the plane indicated by line 12-12 in Figure 3 showwe ing in detail the connection between the motor and fan housing; l

j Figure 13 is a detail vertical sectional viewtaken substantially on the plane indicated by line 13-13 in Figure 1; and

Figure 14 is a'. diagrammatic view of the wiring circuits.

Referring more particularl to the drawings wherein like reference c aracters indicated like parts, and more especially to Figure 1, it will be noted that there is illustrated a furnace 15 which may be of any desired type of construction although in the present instance there-is illustrated a hot water or steam furnace provided with a Water supply pipe 16.

Associated with the furnace 15 is a water level gauge 17 to the upper end of which a T-coupling 18 is connected. To this coupling is connected a fiexible hose or tube 19 which communicates with a chamber 20. This chamber is also connected at its lower end by means of a flexible tube or hose 21 with the lower end of the water `gauge 17. In this manner chamber 2O is supplied with steam and water and reiects the condition of the water supply and the steam pressure. The bracket 22 secured to the lower leg of the steam water gauge 17 is provided with a bracket arm 23 extending toward the chamber 20 and apertured for slidable engagement with a rod 24 adjustably connected to a lug 25 extending from the chamber 20. Bracket 22 is also provided with an o positely extending arm 26 on which a ever 27 is pivotally mounted, this lever being provided at one end with an adjustable Weight 28 and being pivotally connected as at 29, at its other end, by means of a link 30 to the lever 31. This lever kis pivotally mounted as at 32 to a lug 33 projecting upwardly from the cap 34 of chamber 20. Lever 31 is provided with an adjustable weight 35 and movement of this lever is limited in one direction by its engagement with a stop lug 36 also projecting from cap 34,a spring 37 engaging the other end of the lever beyond the pivot point 32 for normally urging leverv 31 into engagement with its stop lug 36..Lever 31 is connected by means of a rod 38 to a dia hragm 39 located between the cap 34 and c amber 20. This diaphragm 39 1s subject to the steam pressure in chamber 20 and when this steam .pressure exceeds. a predetermined limit,

' .willbe raised and through link 30 will oscillate lever 27 for a urpose to be more fully hereinafter'referre to.

Weight 28 on lever 27 acts to counterbalancce chamber 2O which is supported by meansl of the rod 24 and bracket 23 for vertical movement. This chamber is connected by means of a rod or the likel 39 to a. control lever 40 for a water control 'valve 41 located in water supply pipe 16. When the supply of Water in the boiler of the furnace falls below' a predetermined point the amount of waterl in chamber 20 will be accordin 1y decreased whereupon weight 28 will pre ominate, thus permitting chamber 2O to move upwardly, this resulting in an oscillation of lever'27 about its pivot also for a purpose to be more fullyhereinafter set forth. This upward movement of chamber 20 opens valve 41 through rod 39 and operates lever 40, thus permitting water to How into the boiler through water supply pipe 16 until the normal level is reached.

By referring also to Figures 2, 3 and 4 the main burner controlling mechanism will be described. The reference character 42 indicates generally a base or support rovided with an ,upright 43 having secure thereto a sleeve 44 carrying a plate member 45 to which a base plate 46 is secured. This base plate has a portion 47 for supporting a motor 48 and a portion 49 upon which a motor switch 50 is mounted.

A fan housing 51 is secured to the motor 48 in a manner which is most clearly seen from Figures 3 and 12. The fan housing is divided longitudinally providing two half sections fastened together by securing bolts 52, one of these sections being provided with studs 53 projecting from one wall thereof. These studs 53 register with the embossed portions 54 of the motor through which the usual bolts for securing in place the motor casing pass. Two of the studs 53 indicated particularly by the reference character 53a are recessed as at 55 to receive the heads 56 of the motor casing securing bolts. The other two motor casing securing bolts are removed and the corresponding studs 53 indicated b the reference character 53h are made of tu ular formation to receive bolts 57 passed therethrough from the inside of the fan housing, the ends of these bolts 53 being internally threaded for en agement with the usual threaded studs 58 wich normally the -securing bolts 56 engage. The heads of the bolts 57 are countersunk so as not to interfere with the rotation of the fan within the `fan housing. By this construction simple but satisfactory means is provided for mounting the fan housing 51 upon the motor. It will be obvious that the motor shaft extends into the fan housing for rotating the customary impeller blades or fan.

The motor switch 50 has a shaft 59 upon which several controlling cams are mounted.

By reference more particularly to Figures 3, 4 and 5 it will be noted that these cams comprise a main control cam 60 and an ignitlon circuit control cam 61. Cam member 61 is provided with an eccentrically arrangedv pm 62 working in a slot 63 of a lever 64.

main part 64, the lever being connected to a shutter 66 pivotally mounted upon the fan casing as at 67. This shutter controlsthe air inlet of the fan housing 51 and when in closed position permits only a limited amount of air to be forced through the air supply conduit 68 to the burner, yet to be referred to in detail. The pin and slot 62 and 63 betweencontrol cam 61 and lever 64:.

actsasa lost motion connection which permits a limited movement of the cam 61 before the shutter is operated. Thus when the burner is being ignited at the commencement of its periods ofoperation theamount of air fed'thereto is restricted for a urpose to be more fully hereinafter referre to.

The referencecharacter 69 indicates a fuel supply pipe supported by the sleeve bracket 44, this supply pipe being 'provided with a horizontal leg 70 which extends substantially parallel to the blower or air conduit 68 and extends in through the furnace door to the burner. A short length of pipe 71 is connected to the fuel supply pipe 70 and located below the same and is provided with a removable end cap 72 whereby this sec-y tion of pipe 71 may be employed as a sediment trap to receive-dirt or other solid matter from the fuel.v By providing the removable cap 72 this sediment may be conveniently cleaned out. v

Mounted upon the fuel supply pipe 70 and branch pipe 71 is a bracket 73 provided with an arm 74 carrying a bearing sleeve 75.

J ournaled in the bearing sleeve 7 5 is a shaft 76 to one end. of which a cam lever 77 engageable with-cam is attached. Mounted on the. other end of shaft 7 6 is a lever 78. As the cam lever 77 and lever 78 are both ke ed to shaft 76 they rock in unison.

ocated in fuel supply pipe is a valve indicated generally by the reference character 79. This valve is shown more par-Y ticularly in detail in Figure 9 and consists essentially of a valve port 80 closed by the end of a valve stem 81 passing upwardly.

through a sleeve 82 threadedly engaging the externall threaded nipple 83 formed on 'the casing o the valve 79. The upper endl of valve stem 81 passes through a guide disk 84 arranged in sleeve 82 and surrounding the end of valve stem 81 is a spring 85 which bears on the one hand against guide disk 84 and on the other hand against a nut 86 threaded on the end of the valve stem. Spring normally urges valve stem 81 upwardly to open valve port 80.

Secured to the upper yend of sleeve 82 is a bracket 87 to which a valve operating lever 88 is pivotally connected. The free end of this lever is apertured and passing therethrough isa rod 89. The end of rod 89 is threaded for the reception of a nut 90 constituting an adjustable abutment whereby vdownward. movement of rod 89 will be imparted to lever 88.. Rod 89 passes through an aperture 91 in the short end of lever 7 8. vA spring 92 is arranged between the lever 7 8 and an abutment 93 carried on the end of rod 89. so that any movement of lever 7 8 in excess of that necessary to operate the valve compresses spring 92, thus firmly holding valve 81 in closed position. An adjustable stop in the form of a screwl 94: is threaded into a lug 95 carried by sleeve 82, this screw passing through an aperture in lever 88 and being provided with a washer or head 96 whereby the upward movement of lever 88 is limited. It will be obvious that with the herein described structure that when the short end of lever 78 is rocked downwardly as viewed in Figures 2 and 9 valve operating lever 88 will be moved downwardly thus forcing valve member 81 downwardly against the action of spring 85 to close port 80 -to cut olf the supply of fuel being fed to the burner.

Also carried by bracket 73 is a switch box indicated generally by the reference character 97. One section of this box carries a safety. control switch adapted to cooperate with the usual thermostatic switch to close the main circuit for starting theburner and. 1

acting further to close a second circuit' to I stop theoperation ofthe burner irrespective.,

98R', 99B and 100W and with aA fourth binding post 101B. f A spring cont-act memz ber 102 is connected to binding post 98R`1 and as seen in Figure 7 normally contacts with an extension of binding' post 101R.'

Another spring contact member 103 is -connected to binding post 100W. Extending through the casing is. an actuating arm- 104 usually formed of fibre or some other none.

conductor. This operating arm 104 operates through a slot 105'formed in the casing and is carried on a rod 106 slidabl mounted in guides 107. Rod 106 is provi ed with a collar 108 against which the forked end 109,

of lever 78 engages. Rodi-106 is connected by flexible member such as a chain 110 or the like to the end of lever 27 hereinbefore referred to, this chain passing over such idle pulleys 111 or the like as may be necessary. .As also previously pointed out lever 27 is caused, under several varying conditions, to rock about its pivot so as to move its outwardly weighted extending end downwardly and this movement transmitted through the flexible element 110 will cause rod 106 to be moved upwardly. By reason of the engagement of the collar 108 with the forked end 109 ofjlever`78 any upward movement of rod 106 will cause a downward movement of the short end of this lever to-thus close the fuel 'control valve. The upward movement of l es rod 106 also moves fibre control arm 104 upwardly through its slot 105 to thus move spring contact member 102 from its full line to its dotted line position as seen in Figure 7 or in other words, out of engagement with binding post 101B and into engagement with spring contact element 103 and also in engagement with contact 112 carried by binding post 99B. Y

Another section of the switch casing V'97 carries a mercury switch 113 controlling the'` ignition element circuit. This mercury switch 113 is carried by an arm 114 mounted on a shaft 115 journaled in the switch casing 97, this shaft extending to the outsde f this housing and carrying an operating arm 116 enga able with cam 61 hereinbefore referred to. spring 117 normally urges operating arm 116 into the periphery of cam member 61. This cam disk is provided with recessed -portions 118, one of which is larger than the other. When the end of operating arm 116 engages -either of these recesses mercury switch 113 has been rocked into a position opposite to that shown in Figure 8 wherein the mercury closes contacts 119. During the rotation of' cam disk 61 in the direction of the arrow Aindicated in Figure the circuit to the ignition element will first be closed'for a period equal to the time it takes arm 116 to traverse the larger recess 118 whereupon the switch will be opened as the arm engages the peripheral portion 119 and thereafter the switch will again be closed as the arm traverses the smaller recess 118, but in the.latter instance the circuit will be closed for a much shorter period and will subsequently be again opened and remain open as long as the operating arm 116 engages the concentric eriphery of the cam disk 61 as shown in igure 5.

For shutting off the oil supply and operating the safety control switch when oil has accumulated as a result of the failure of the burner to properly igniteI provide the following construction. The reference character 120 indicates a return pipe for conducting the oil accumulated in the burner therefrom. This return pipe empties into a bucket or container 121 supported on the end of an arm 122 pivotally mounted on bracket 73 as at 123. The other end 124 of this arm or lever 122 is weighted and engages the lower end of rod 106. The weighted end of lever 122 is sufficient to counter-balance the weight of container 121 but whenoil has accumulated in this'container it will overbalance the Weighted end 124` and rock this lever about its pivot 123 to thus raise rod 106 and also rock lever 78 which in turn actuates the valve control mechanism to close the fuel supply valve. Lever 122 is provided with a lug or projection 125 which normally engages against a stop pin 126 in r the normal position of these parts.

While any preferred or acceptable form of burner may be employed I have found that a burner constructed Vsubstantially in accordance with the disclosure in my Patent No. 1,598,528 dated August 31, 1926, works with complete satisfaction. In the present instance I have however lslightly modified some of the details of the burner shown in my aforesaid patent. struction for instance upon the outer guard ring 127 I mount an inner ring 128 substantilly of the form illustrated in Figures and 11 and I provide a refractory lining member 129, the upper surface of which,

is substantially flush with the upper surface of ring 128. Formed in ring 128 is an annular groove for receiving a ring of refractory material 130 in a circular groove of Which'I arrange my ignition element 131 which as I have shown consists of a resistance element or coil. The two ends of this ignition element are connected to binding posts 132 connected in circuit with the murcury switch 113 hereinbefore referred to. The resistance element 131 is located below the path of the fuel and air thrown radially outwardly by the fuel and air supply means of the burner. The fuel which is thrown outwardly by centrifugal force b the rotating part of the burner runs bac down the inclined surface formed by the refractory member 129 and inner ring 128 and through spaced depressions 133 formed in annular rib 134 and thus into engagement at spaced points with the ignition element 131. Thus this fuel becomes ignited at several points circumferentially of the heater and the complete ignition of the burner in an expeditious manner is assured. Located between the fuel and air ejecting means and the ignition element 131 are a plurality of spaced fuel arresting elements 134a formed preferably of chromium steel wire. These members intercept a portion of the fuel and deposit it upon the ignition element to further insure ignition.

The operation of m improved apparatus will now be describe particular reference being had to Figure`14 which shows diagrammatically the rwiring circuits.

As is vcustomary a thermostatically controlled switch 135 is arranged in the room or chamber to be heated and in general a three-wire system is employed, the wires thereof extending through vswitchv 97 to the motor switch 50. This motor switch is of the general type now in commercial use and extensively employed in connection with automatic oil burner systems and the like. As this switch forms no part of my present invention vit is not described in detail. However, this switch comprises a mechanism whereby shaft 59 carrying cams and 61 is rotated 180 when one of the circuits thereto is closed and the other 180 In the present conv meas i' current and connection is made `with this,

outlet boxl by means of a plu 138 connected by wires 139 to the motor switch 50,

As first mentioned the circuit from the thermostat 135 is a three-wire system, the wires of which are generally designated by colors, there being an electric wire. 140,

I usually white, connected to terminal 141 on the thermostat andto binding post 100W' on the safety control switch 97. This binding post is connected b wire 142 to binding post 143 of motor switch 50. This is the white ywire of the system which to ether with either of the other two wires is a a ted to complete a circuit to the'motor switc -to Start or stop the operation of the burner.

The red wire 144 is connected to binding post 145 on ythe thermostat and to binding post 98E on the safety control switch 97.

yThis circuit then passe's through spring contact element 102 to binding post 101B and then by wire 146 to binding post 147 on the motor switch. With the safety control.

switch in the' position illustrated in Figure 7 the circuit to the motor switch 50 will be `te close the circuit between the red' and White conduits at the thermostat. Blue wire 148 is connected to the other binding post 149 at the thermostat and to binding post 99Bv at the safety control switch. A wire v150 extends from binding post 99B to binding post 151 at the motor switch and this blue conduit together with the' white closes circuit to the motor switch whichcauses it to make another one-half revolution which shuts of the oil burner.

If, however," the thermostat throughfailure to operate or some other condition keeps the o n circuit closed the safety control switch 97 may function to break the white and red circuit and close the White and blue circuite thus causing the motor switch 50 to operate tol shut i the burner. Under these conditions rod 106 is raised throuf'rh any one of the instrumentalities hereinlbefore referred to this movement of rod 106 raising control arm 104 to thus move spring contact element 102 olf of binding post 101B and into engagement with contact element 103 as shown by the lines in Figure 7, and also in engagement with contact 112 carried by binding post 99B. v lThe blue and white 'circuit is then closed through the safety control switch and the motor switch will opery lever.

causes diaphragm 39 to force rod 38 upwardly to thus rock -lever 31 which through of water falls below a predetermined point lweight 128 will overbalance member 20 and also raise rod 106. In a like manner an accumulation of oil in the overflow receptacle 121 will rock lever 122 and raise end 124 and thus force rod'106 upwardly. Any upward movement of rod 106 will rock lever 78 about its pivot 76 by reason of the engagement of collar 108 with the foked end 109 of the Thus the short end of lever 78 is moved downwardl and through rod89 and the associated mec anisln closes fuel control valve 81.

When the red` and white circuit is closed through the thermostat and through the safety control switch motor switch 50 will operate to cause shaft 59 to rotate 180.V This positions the recess in cam 60 under the end of lever 77 and rocks shaft 76 so as to rock lever 78 in a direction in which its short end moves upwardly to open the fuel control valve and its other end moves downwardly. This moves. rod 106 downwardly and lowers operating arm 104 so that spring contact member 102 rests on binding post 101B and completes the on circuit through the safety control switch 107. At the. same time cam 61 is rotatedto operate the mercury switch 113 which controls the circuit to the ignition element 131. This mercury switch is connected by wires 152 to binding posts 153. From one of these binding posts a wire 154 connects to binding post 132 of ignition element 131. A wire 155 extends from the other binding post 132 rough the casing of the mercury switch and then into the motor switch 50.

When cam 61 is operated the end of lever 116' first comes into engagement with the larger recess 118 and rocks mercury switch so that contacts 119 are closed and the cirlink 30 rocks lever 27 whichA through exible member 110 raises rod 106. 1f the supply ,cuit completed to the ignition element. This circuit is maintained closed for a period suiicient to bring the coil to a white or red heat whereupon.. the arm comes in contact with surface 119 and the circuit is opened. During this time the coil 131 cools slightly but before the same is completely cool the switch is closed again by reason of engagement of the arm 116 with the other recess 118. By opening and closing the circuit to the ignition element a saving in electrical energy is obtained and at the same time the element is kept sufiiciently hot to quickly ignite the oil.

At the outset it is not eicient to supply a large quantity of air to the burner as this' air will act to cool the ignition element 131 and prevent the ready ignition of the fuel. Therefore the shutter 66 is maintained closed during the first portion of the rotation Vof shaft 59 or until such time a's the oilhas operation of the bur-ner this shutter is yin open'position anda maximum supply of air is furnished the burner.

When the thermostat subsequently closes the white and blue circuit or when rod 106 is `raised by any one of the instrumentalities capableof effecting this operation then the motor switch completes another 18.0 operation and at the same time opens .the circuit to the blower motor 48 which was previously closed. Rotation of shaft 59 moves cam 60 from the position shown in Figure 5 to a osition where the lever 77 has moved out ofp the recess, which movement rocks shaft 76 and lowers the short end of lever 78 to close the fuel supply valve. At the same time cam 61 is rotated and through the lever 64 closes shutter 66. It will be understood that prior to the completion of the rotation of cam disk 61 on the previous operation lever 116 had moved to the concentric surface of this cam member to thus move the mercury switchto the ofi' position illustrated in Figure 8.

It will be immediately apparent to those skilled in this art that while one embodiment of this invention has been described and illustrated herein somewhat in detail that various modifications may be made in many of the esssential and all of the non-essential details of this invention without departing from the spirit and scope thereof and to this end reservation is made to make such changes as may'come within the purview of the accompanying claims.

What I claim as my invention is 1. In an oil burner control system, a thermostat switch, a motor switch, electric circuits includin said thermostat and motor switches, an a1r control shutter, a fuel control valve and an ignition element circuit and means operable by said motor switch for controlling said shutter, element circuit. Y

2. In an oil burner control system, a thermostat switch, a motor switch having a rotatable shaft, electric circuits including said thermostat and motor switches, an air control shutter, a fuel control valve and a switch controlling an ignition element cirvalve and ignition vsaid burner comprisin said rotatable shaft for controlling said shutter, valve and ignition element switch.

3. In combination, an oil burner, an automatic electric switch device for controlling the same, an ignition device associated wit an electrical resistance element, an electr1c circuit Afor supplying current thereto,- a switch in said circuit and means operated by said switch device for alternately closing and opening said switch duringthe active period of said resistance element. v

4;. In combination, an oil burner, an automatic electric switch device for controlling the same, an ignition device associated with said burner comprising an'electrical resistance element, an electric circuit for su plycurrent thereto, a switch in sai cuit and cam and lever means actuated by said switch device for alternately closing and opening said switch during the active period of said resistance element.

5. In combination, an oil burner, an automatic electric switch device for controllin the same, an ignition device -associated with said burner comprising an electrical resistance element, an electric circuit for supplying current thereto, a switch in said circult, cam and lever means actuated by said switch device for controlling said ignition circuit switch, said cam being designed to alternately close and open said switch during active period o f said resistance element.

6. The combination with an oil burner, of an ignition element therefor comprising an electrical resistance element, a circuit for supplying electric current thereto, a switch controlling said circuit and means for alternately closing and openingl said circuit during element.

the active period of said resistance cir- 7. In combination, a boiler, an oil burner,

control mechanism therefor, a chamber member, means for slidably mountin said chamber member, a pressure actuate diaphragm in said chamber member, a counter-balancing lever, means connectin said lever to said chamber member and diap agm, means connecting said control mechanism to said counter-balancing lever and means connecting said chamber member to the steam and water chambers whereby said diaphragm is actuated in accordance with changes in steam pressure and said chamber member moved in accordance with said water level to move said counter-balancing lever in accordance therewith.

8. The combination with a boiler and an oil burner therefor, of control mechanism for said burner, including a movably mounted chamber connected to the water chamber of the boiler, a pressure responsive device within said chamber, a control switch and fuel valve and means connecting said chamber and pressure response device to said control switch and fuel valve for operating the i latter in dependence upon the water lever and steam pressure in said boiler. I

9. The combination with a boiler and an oil burner therefor, of a control mechanism including a movably mounted chamber connected to the water chamber of said boiler, a pressure responsive device within .said chamber, means for counter-balancing said chamber including a lever, a second lever connected thereto and operatively connected to said pressure responsive device, a control switch and fuel valve, and means connectin said irst mentioned lever to said contro switch and fuelwalvefr 'the purpose set forth.

10. In an automatic oil burner construction, the combination with -an oil burner, of a motor switch, an ignition control cam operated thereby,'an air blower, a shutter for said blower and slotted lever and pin means operatively connecting said cam to said shutter, for the purpose set forth.

l1. The combination with an oil burnei` having a motor driven air blower, a-motor switch, and electric circuits including said motor switch, of a shutter memberfor controlling the air delivered by said blower, and a slotted lever and pin means connected to said motor switch whereby said shutter is automatically actuated by said switch.

12. The combination with an oil burner having a motor driven air blower, a motor switch, and electrical circuits including said motor switch, of a shutter member for con' trolling the air delivered by said blower, and means for controlling` the said shutter comprising a lever connected thereto and provided with a slot and a rotatable cam pin associated with said motor switch and engageable with said slot for actuating said shutter during a portion of the rotation thereof.

In testimony whereof I aiiix my signature.

ACHILLE KAIS'.

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