US1748416A - Oil burner - Google Patents

Description

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6 Sheets-Sheet l f OQO SNN @N Feb. 25, 1930. r-.|ul\Rl::u-1GE` ou. BURNER Filed July 5; 1922 Mh WIIHIJVNC NM, /N QQNQQN \N\ @QN F. HARDINGE Feb. 25, 1930.

OIL BURNER Filed July 5. 1922 6 Sheets-Sheet 2 F. HARDINGE OIL BURNER Feb. 25, 1930.

Filed July 3. 1922 6 Sheets-Sheet 3 l @MY .QQ www NGN. QW

F. HARDINGE Feb. 25, 1930.

OIL BURNER Filed July 5, 1922 6 Sheets-Sheet 4 Q /iz/ F. HARDINGE Feb. 25, 1930.

OIL BURNER Filed July 3. 1922 6 Sheets-Sheet 5 IMM/y? WM Y@ aL @y F. HARDINGE Feb. z5, 1936.

OIL BURNER e sheets-sheet 6 Filed July 3. 1922 M. El

Patented Feb. 25, 1930 UNITED STATES PATENT OFFICE 1 FRLNEIN HABDINGE, F CHICAGO, ILLINOIS, ASSIGNOR .T0 HARDINGE BROTHERS,

INC., OF CHICAGO, ILLINOIS, A'COBPOBATION OF ILLINOIS oIL :summa Application led .Tuly 3, 1922. Serial No. 572,455.

My invention relates to improvements in oil burners and is particularly concerned with, though not limited to, improvements in that type of oil burner comprising a rotary atomizing nozzle. A

The objects of my invention are to provide an oil burner comprising: first, a novel form of rotary atomizer so constructed as to prevent the carbonization of fuel upon its interior or spreading surface; second, an atomizing nozzle so constructed that the oil delivered thereto will not be vva'porized before it reaches the atomizing edge of the atomizer, eventhough an exceedingly small quantity 1s of oil isbemg burned; third, means for keeping the temperature of the atomizing nozzle and its associated parts below the temperatureat which oil, and particularly fuel oil and other heavier petroleum distillates and residuums, carbonize; fourth, means forcooling the interior parts ofthe atomizing nozzle fifth, means for preventing the flame and the heated air produced by the flame from being drawn or sucked into the atomizinfr nozzle;

sixth, means for preventin fuel oil rom contaminating the oil used or lubricating the n rotary support `of the atomizing nozzle; seventh, new and improved means for automatically varying `the supply of 4air to the atomized fuel to keep the air properly proportioned to the amount of fuel being burned. .i A still further object of my invention is to provide an oil burner, the various parts of which are so arranged that they can be easily and quickly assembled and replaced by a corresponding part. In carrying out the last object, I have so yarranged different parts of my burner that they can be removed as units. Among other things I have provided a -fuel pipe, a hollowspindle surrounding the fuel pipe and rotatably mounted in the head and an atomizer supported by the spindle, the construction of the head and spindle being such thatthe head and spindle, the bearings I for the spindle and other associated parts can be removed from the burner bed plate without disturbing` the remaining portions of the burner and be replaced by a similar unit. I have also rovided means whereby the motor .6 can be quickly and easily removed, and have also mounted the fuel pump, standpi e and strainer on a common supportso that t ey are readily accessible for replacement or repair.

A further object of my invention is to provide means causing the burner to operate so as to prevent'the accumulation of carbonized oil upon the rotary atomizing nozzle, and still another object is to provide means for automatically controlling the operation` of the burner so as to make it possible to maintain a given space or part at a substantially constant temperature.

The above and other objects of my invention -will appear as this description progresses, reference bein had to the accompanying drawings," in wich Figure 1 is a plan of my improved oil burner, certain portions thereof being broken Figure 2 is a side elevation, parts thereof being broken awa Figures 3 and 3g, taken together, constitute a vertical central longitudinal section of my improved oil burner;

Figures 4 and 5 are vertical transverse sections, respectively, taken on lines 4-4 and 5 5 of Figure 1;

Figure 6 is a central vertical section through a portion of the atomizing nozzle, its rotary support and associated parts,'this figure being made on a much larger scale than that employed in Figure 35 Figure 7 is a transverse section taken on the line 7-7 of Figure 6;

Figure 8 is a transverse section taken on the line 8- 8 of Figure 5;

. Figure 9 is a sectional detail showing certain features of construction of the head of my improved burner;

Figure 10 is a central vertical section through the improved fuel controlv valve forming a part ofmy invention Figure 10A is a diagrammatic view on an enlarged scale of the opening in the stem of the valve illustrated in Figure 10;

Figure 11 is a transverse section taken on the line 11-11 of Figure 10;

Figure 12 is a central longitudinal section through one of the strainers which I employ; and

Figure 13 is a sectional detail showing the details of construction of the means which I employ for stopping the motor in the event the iame becomes extinguished.

4Throughout the several views, similar reference characters are used for referring to similar parts, and the several sections are taken looking in the direction of the small arrows.

Referring to the drawings, my improved burner comprises the longitudinal side rails 15 and 16 which are connected at their opposite ends by the end plates 17 and 18 (see Fig. 2). A bottom plate 19 extends between the outer ends of the side rails 15 and, to-

- gether with the end plate 17 and the inclined intermediate wall 20, form a depression.- for receiving the electric motor 21. The upper edges of the rails 15 and 16 and the end plate 17 are respectively provided with the outwardly extending flanges 22, 23 and 24, the upper faces of which all lie in the same plane, and the intermediate wall 2O has an inwardly exten-ding trough-shaped extension 25 for receiving a corresponding outwardly extending extension 26 on the auxiliary bed plate, coniprising the side walls 27 and 28 (see Fig. 5), the inner end wall 29, the outer end wall 30 and the bottom plate 3 1, all of which together Y form a hollow or dish-shaped auxiliary bed plate for supportingl certain parts of my burner to be referred to later on.

The upper edges of the side walls 27 and 28 are respectively provided with the outwardly extending flanges 32 and 33 which extend over and are supported by the flangesv 22 and 23 respectively of the main bed plate. Dowel pins 35 received in registering openings in the flanges of the main and auxiliary bed plates, provide means for holding the two bed plates in proper position relatively to each other. Projecting laterally from the inner ends of each of the side rails 15 and 16 of the main bed plate are a pair of spaced brackets 36, each of which terminates in a cylindrical boss 37'. Each of these bosses receives the lower end of a post 38 which extends upwardly therefrom. These postsprovide a support for the neck ring 39,-the lower end of which is turned outwardly and then upwardly to provide a trough 40 (see Figs. 3 and 5). Lugs 41, extending outwardly from the trough 40, are supported by the upper ends of the posts 38.

To form a fire boX for my improved burner, I provide a plurality of sector-shaped sheet metal plates 42,the radial edges of which overlap each other, as shown at 43 in Fig. 1, to form a fiat annular support for the re bricks 44 and the fire clay 45, which together `form a circular lire boX in which the oil spray formed by my improved burner is burned. The plates 42 incline slightly toward the trough 440 so as to insure the drainage of any oil which may, under certain circumstances,

is provided with a bore in which is securedv the cylindrical boss 51 of the housing 51,

the set screw S being used for securing the,

boss in the bridge member. In the housing 51 is supported the aligned anti-friction bearings 52 and 53, which, in turn, support a short shaft 54, the outer end vof which is secured to the shaft 55 of the motor 21 by a suitable universal joint 56,' which, in this in-l stance, is illustrated as comprising a coil spring 57, the ends of which are secured to the collars 58 and 59, respectively, which, in turn, are secured to the shafts 54 and 55, respectively, by the pins 6() and 61. It will, of course, be apparent thatany suitable universal joint may be used for this purpose.

Intermediate its ends, the shaft 54 is provided with a worm 62 which meshes with a I worm wheel 63 carried bythe pump shaft 64.

The shaft 64 is supported by suitable journals 65 and 66. The Vjournal 65 is supported in the cylindrical journal box 67 forming a part of the housing 51, and the journal `v66 is su ported by a similar journal box 68 carried y the cover 69 which closes the opening 70 in one side of the housing 51.

The lower part of the housing 51 is formed in the shape of a trough 51" which provides means for holding lubricating oil for oiling the bearings of the shaft 54, oil being supplied to this basin through the opening 71 which has a suitable closure 72.` The speed of the shaftr54 is sufficient to throw oil up onto the worm wheel 63 from which the oil drains down into the journals 65 and 66, thus lubricating these ournals and the shaft 64.

The inner end of the'shaft 54 is keyed to the shaft 73 by a suitable key 74 and co-acting sleeve 75, which is held in place vby a pin 76 extending through it and one end of the shaft 73. The inner end of the shaft 73 is secured to a stub shaft 77 by a key 78 andl co-acting sleeve 79. The sleeve 79 is held against displacement by a pin 7 9 extending through it and the adjacent end of the shaft 73. The stub shaft 77 is journaled in the self-centering bearing sleeves 80 and 81. The sleeve 81 is supported in a suitable bore 82 formed in the outer end cap 83 of thehollow head 83 and is held in place by means ofl a set screw 84. A collar 85, secured to the outer ,end of the shaft 77, limits the inward movement of the shaft 77 and the hub 86 of the bevel gear 87 limits the outward movement of the shaft. The gear 87 can be secured, to the inner end of the shaft 77 in any desired manner.

Journaled in'suitable bores in the upper and lower sides, respectively, of the hollow head 83 are the anti-friction bearings 88 and 89, respectively, the detailed construction of which will be referred to later on. The antifriction bearings 88'and 89 support a hollow spindle 90 upon the lower edge of which is secured the bevel pinion 91, which meshes with the bevel gear 87. The pinion 91 forms a stop for limiting the downward movement of the spindle 90. A collar 92, threaded on the spindle 90, abuts against the inner race of the anti-friction bearing 88 and prevents upward movement of the spindle 90.

A comparatively deep tubular or bellshaped atomizing nozzle 93, the upper open end of which is flared outwardly, as most clearly shown in Fig. 3, is secured to the upper end of the hollow spindle 90 by being threaded thereon, as shown at 94. For convenience in manufacture and assembly, I prefer to form this atomizing nozzle in two parts,-93 and 94-Which are threaded together, as shown at 93a. The bore of the atomizing tube increases in diameter towards its outer end so that any fuel oil discharged into the atomizing nozzle will travel, under the influence of centrifugal force, upwardly along the walls of the atomizer nozzle and be discharged from the atomizing edge 95 in a fine spray.

Heretofore much difficulty has been experienced in attempting to burn oil at a comparatively small rate in centrifugal atomizer burners; This diliculty has resulted from the deposition and accumulation of more or less solid masses of carbonized 'oil upon the inner surfaces of the atomizing nozzles. I have discovered that one of the causes of this trouble or difficulty is that the heat reflected from the inner walls of the furnace is absorbed by the atomizing nozzle and heats the atomizing nozzle up to a temperature favorable to the carbonization of the oil which causes a gradual accumulation of carbonized oil until the burner is made useless. l

Toprevent the diliculty pointed out above, I provide the exterior surface of my atomizing nozzle with a plurality of radiating ns which radiate the heat at a suliicient rate to prevent the temperature of the atomizing nozzle from reaching the point at which carbonization of the oil takes place. I preferably malrethese radiating tins in the form of flat rings 97, the inner edges of which have formed integrally therewith the spacing collars 98l` the internal diameters of which are such as 'to snugly fit the exteriors of the two parts 93 and 94 of the .atomizing nozzle. The radiating fins on the part 93 are held in assembled relation by a nut 99 and those on the part 94 are similarly held in position bya nut 100.

The fins 97. may be utilized for balancing the rotary atomizing nozzle 93 by unbalancing the radiating fins, as for instance, by boring openings 101 therein (see Fig. 6). These unbalanced rings can then be adjusted around the atomizing nozzle until it is completely balanced, whereupon the nuts 99 and 100 can be used for holding the tins in their adjusted positions.

I have discovered that the heating of rotary atomizing nozzlesof the type which I employ is due to a considerable extent to a partial vacuum being formed within the atomizing nozzle when it is rotated. The rotation of the atomizing nozzle and the friction between its inner walls and the air contained therein is sutlicient to cause the air to be eX elled from the atomizing nozzle under the in uence of centrifugal force, thereby reducing the pressure inside the atomizing nozzle and causing the heated air and flames in the fire box to be drawn downwardly in the center portion of the nozzle and then thrown out again along the side walls-thereof, thus causing a constant circulation of heated air within the atomizing nozzle which contributes to the heating of the atomizing nozzle and the accumulation of atomized oil on its interior walls. To prevent this action I have provided means for permitting the access of air to the lower end of the atomizing nozzle through the hollow spindle 90, as shown in Figs. 3 and 6. Any tendency toward the formation of a vacuum n the atomizing nozzle results in the flow of cold air up through the spindle and the atomizing nozzle and thus prevents the heated air of the furnace from being drawn into the atomizing nozzle.

In order to insure an adequate supply of air to the interior of the atomizing nozzle, I provide a centrifugal fan comprising the fan blades or vanes 102 (see Figs. 6 and 7), the lower ends of which are notched -to fit over the bottom ring 103 (see Fig. 6) and the upper ends of which are secured in radial slots 104 formed in the lower side of the annular trough-shaped ring 105, the blades be ing secured to the two rings by means of solder or in any other suitable way. By reference to Figures 6 and 7 it will be noted that the width of the blades or vanes 10QI is considerably less than the radius of the bore of the atomizing nozzle at this point, thus leaving plenty of room at the center of the fan for the access of air. To cause the fan to rotate with the atomizing nozzle, I provide a pin 106 which is secured in the atomizing nozzle and the inner end of which projects inwardly far enough to engage the outer edge of one of the fan vanes. When the atomizing nozzle is rotated, the fan rotates with it and draws air upwardly through the hollow spindle and throws it outwardly against the inner walls of the atomizing nozzle. The air travels upwardly along the walls and into the upper portion of the nozzle, thus relieving any tendency toward the formation hollow spindle, and the tapered exterior 109 thereof acts as a centering device for the fan, as will be apparent from an inspection of Figure 6.

The means for supplying fuel oil to the burner comprises a suitable force pump 110, which is here illustrated as being of the gear type and which is driven from the shaft 64 through a suitable clutch arrangement 111. The gear pump draws its supply of fuel from a supply tank 112 (see Fig. 2) through the intake pipe 113 which discharges into the strainer 114 which comprises an outer housing (see Fig. 12), in which is supported a cup-shaped screen 115, the upper end of which is secured to an annular nut 116 which is threaded into the Lipper end of a casing. The intake pipe 113, which in Figure 12 is shown shifted 90 degrees from its actual position, discharges into the upper end of the casing and the oil thus passes downwardly and through the screen 115 and out through the pipe 117. The other end of the pipe 117 communicates with a hollow boss 118 formed on one side of the hollow head 83. Extending transversely of the head 83 and formed integrally therewith and with the boss 118 is a conduit 119, one end of which communi-I cates with the interior of the boss 118 and the other end of which communicates with the corresponding boss 120 on the side of the head 83 opposite the boss 118. A return pipe 121 leads from the hollow boss 120, passes outwardly, then transversely across the machine, and then outwardly again beneath the pipe 117, and finally discharges into the intake side of the gear pump 110. A discharge pipe 122 leads from the discharge side of the pump 110 to afour-way union 123, from the top and bottom of which project pipe sections 124 and 125, respectively, the latter being comparatively long. A reducing union 126 is secured to the upper end of the pipe 124 and a pipe 127 is secured in the smaller portion thereof and projects downwardly through the union 123 and to a point adjacent the bottom of the pipe 125, as shown in dotted outline in Figure 4. A three-way union 128 connects the top of the pipe 127 with a pressure gauge 129 and the pipe 130 which discharges into a strainer 131, the construction of which is apparent lfrom an inspection of Figure 4.

A pressure regulating valve 132 is connected with the four-way union 123 by the pipe 133. This valve comprises a body member having a valve seat 134 formed therein, with which the valve 135 co-acts. A hollow plug 136 is screwed into one side of the body member and has an adjusting screw 137 threaded therein. The' inner end of this screw bears against a cap 138 which slides in the hollow stem 139 of the valve 135. A spiral spring 140 yieldingly transmits the pressure of the screw 137 on the cap 138 to the valve. From the above construction, it will be clear that by adjusting the screw 137 inwardly or outwardly, the pressure at which the Valve 135 will open can be controlled. A lock nut 137 provides means for locking the screw 137 in any of its adjusted positions.

The valve 132 discharges into a standpipe 141 which in turn discharges into the pipe 142 which returns the oil passing through the valve 132 to the supply tank 112. At its upper end the pipe 141 is provided with a cup 143 which is loosely closed by the screwthreaded plug 144. `This provides means for easily returning to the supply tank any oil which may escape from any part of` the burner while repairs are being made.

The oil which passes out through the strainer 131 flows through the short sections of pipe 145 and 146 connected by the threepart union 147 and into the body member of the oil-control valve 148 see Fig. 3A). The details of construction o this valve will be referred to later on. The oil passes from the valve 148 through the pipe ,149 and cut-0H valve 150, elbow 151, three-way union 152 and pipe153 to the block 154 which is secured to the bottom wall 31 of the auxiliary bed plate by screws 155. This block is provided with a horizontal bore 156 which -intersects and communicates with the vertical bore 157. The pipe 153 discharges into the bore 156 and from thence into the lower end of the standpipe 158, the lower end of which is provided with an opening 159 registering with the bore 156 and the open lower end of which is closed by the plug 160 in the block 154. At its upper end the standpipe 158 is provided with a detachable extension 161, the lower end of which is threaded into the upper end of the standpipe 158. This extension projects through the thimble 107 and upwardly into the lower part of the atomizing nozzle, as clearly shown in Figures 3 and 6. The upper end of the extension 161 is squared, as shown at 162, for receiving a socket wrench, or other means, whereby it can be unscrewed from the standpipe proper. The upper end of the extension 161 is closed, as indicated in Figure 6, but adjacent this end are a plurality of radially extending openings 163 which discharge the fuel oil in the radially extending grooves 164 in the cap 165 which surrounds the upper end of the extension k161 and rests upon the shoulder 168 formed on the extension just below the openings 163. The oil which is discharged outer side wall of the trough 105 is provided with aplurality of spaced apertures 169. When the oil flows from the lower edge of the flange of the cap 165, it practicall seals the opening between this flange and t e bottom of the trough 105 so that the oil flows from the cap to the trough in a practically uninterrupted film. This film is of importance becauseit, togetherr with the baiie action of the outer wall of the trough 105, the flange ofthe cap 165 and the inner wall of the trough 105', offers sufficient resistance to prevent the'fan from drawing air in through the space between the upper end of the extension 161 and the inner wall of the trough 105. It is, of course,vapparent that the standpipe 158 and its extension 161, as well as the cap 165, are stationary, whereas the trough 105 rotates with the atomizing nozzle. The

oil which flows into the trough 105 from the cap 165 passes outwardlythrough .the apertures 169 and is discharged onto the adjacent portions of the inner walll of the atomizing nozzle by centrifugal force. From these points the oil is carried by centrifugal force up the walls of the atomizer nozzle and discharged from this atomizing edge 95. The apertures 169 are of importance in that they cause the oil to be discharged from the trough 105 onto the inner wall of the atomizing noz` zle in a stream of comparatively small cross section and these streams do not, therefore, interfere with the free passage of air from the fan upwardly through the atomizing nozzle. Preferably the apertures 169 are placed directly over the upper edges of the blades or vanes 102 of the fan so as to cause the streams of oil to be projected outwardly directly above the upper edges of the fan blades 102v and thereby interfere in the least possible manner with the air discharged by the fan.

I shall noi-v describe the details of construction of the valve. which I employ for controlling the rate at which fuel is supplied to the atomizing nozzle. This valve comprises the body member 170A (see Figs. 10 and 11) having a lateral inlet port (not shown in Figs. 10 and 11, but clearly indicated as communieating with the pipe 146, Fig. 3A) and the discharge port 171. The latter port 1s coaxial with an opening in the opposite side of the body member 170 which receives the hollow threaded plug 172 in which is rotatably mounted the valve stem 1'7 3. A suitable gasket 17 4, bush 175 and gland 176 provide means for preventing undue escape of oil along the valve stem 173. A worm wheel 177 is slidably mounted upon the outer end of cate the adjustment of the valve.

the valve stem 173 and is feathered thereto by a key 178 operated in suitable grooves in the stem 173 and the worm wheel 177. A fibre washer 179 separates the Worm wheel 177 from the top of the gland 17 6.

The lower end of a spiral spring 180 bears upon the upper side of the Worm wheel 177 and its upper end bears against a flange 181 extending inwardly from the sleeve 182 which encloses the spring 180. A split rin 183 surrounding the reduced portion 184 o the valve stem acts as an abutment for the flange 181 ofthe sleeve 182 so that the tension of thespring 180 is communicated to the valve stem.

The body member of the valve has a laterally extending projection 185 which projects through an opening in the lower end of the bracket 186 and to which the bracket is firmly secured by means ofthe set screw 187, the inner end of which engages a flat 188 on the projection 185. At its upper end the bracket 186 is projected laterally, as shown at 189, to provide a support for the split bushing 189, which is internally and externally threaded, and the upper end of which is provided with a fiange 189a which is slotted at 1891 to secure the in 189c which holds it against rotation. T 1e bushing 189 supports the screw 190 in the lower end of which is secured a hardened steel ball 191, the lower side of which rests in a spherical cavity in the upper end of'the valve stem 173, this end of the stem being hardened. The extension 189 is bifurcated or; split on a plane passing through substantially the center of the screw 190, and a screw 192 provides means for adj usting the two bifurcations 'toward or from each other to exert suiiicient pressure upon the screw 190 to hold it in any of its adjusted positions.

To enable the operator to make a predetermined adjustment of the screw 190, and, consequently, of the valve stem 173, I provide a dial disc 193 which has a hub 194 which is secured to the stem 195 of the screw 190 by means of the set screw 196. The inner end of this set screw engages an elongated reduced portion 197 of the stem 195, thereby providing means for adjusting the dial 193 longitudinally of the stem. The outer edge of the dial 193 is beveled, as shown at 198, and may be provided with a suitable scale for co-acting with the index point 199 to indi- The knob 200 (see Fig. 3A), secured to the stem 195 by the set screw 196, provides means for permitting manual adjustment of the valve. By providing my valve with the removable bushing 189, which is threaded in a suitable opening formed in the bifurcations of the extension 189, I make it'possible to easily and quickly adapt my valve to control the supply of oil to various size burners. By removing the bushing 189 and its screw 190 and by replacing these elements with corresponding elements having coacting threads of a different pitch, I can either increase or decrease the extent of movement of the valve stem 173 eifected by a given angular movement of the screw 190. At the same time the bushing 189 and the screw 190 are changed. The valve stem 173 can, if desired, be replaced by one having a larger or smaller opening 226.

A'lever 205 is provided with a hub 206 (see Fig. 11) which is pivotally mounted upon- 215 with reference to the worm wheel 177, I

thread the plug 216 into one side of the bracket 186 and then secure the bracket to the plug by means of a screw 217, thereby locking it 1n its properly adjusted position. The lever 205 has a housing 218 formed integrally therewith which encloses the worm wheel at the point where it meshes with the worm. Secured to the outer end of the shaft 212 is a groove pulley 219A which is driven by the belt 220 (see Figs. 3A and 4), which belt is in turn driven by a groove pulley 221 secured to one en d of the clutch member 111. A guy rod 222, having one end secured to the screw 192 'at the end of the bifurcated extension 189 and its other end secured to a boss 223 projecting from the body member of the valve, providesmeans for preventing the extension 189 from springing away from the body member under the tension of the spring 180. This is very important, inasmuch as the slightest movement of the valve stem 173 in either directionproduces a large fluctuation in the flame produced by` the burner.

The lower end of the valve stem 173 is-provided withthe inwardly extending bore 225 (see Fig. 10) which communicates with a.

small opening 226 passing through the wall of the bore. This opening is, as shown in FigglOA, preferably triangular in shape with rounded corners. The radius of the fillet in the upper corner is preferably that of a circle which will accommodate the minimum flow of fuel under a predetermined pressure. This end of the valve stem is rotatably mounted in the cylindrical valve seat 227, the upper edge of which is beveled, as shown at 228, and the lower edge of which is provided with a flange 229 which is clamped to the annular seat 230 of the body member by the gland 231.

From the above description, it will be apparent that when the motor is in operation,

opening 226, and by thenproperly adjusting the vvalve 148, the supply of fuel to` the atomizer can be very accurately controlled.

Fuel oil of the character which my improved burner is particularly designedto burn, that is, fuel `oil from 24 to 28 degrees Baume, contains more or less dirt Aand sediment which may pass through both of the screens interposed between the supply and the control valve and will have a tendency to clog the small opening 226. It is, therefore, absolutely essential to the successful burning of such 'oil'that this opening not only beso kept open, but absolutely clear of any foreign matter or sediment which would tend to restrict the opening. This result is accomplished by the construction described because the friction ofL the bevel portion 228fupon such dirt or sediment is sufficient to hold it while the opening y226 moves away from it, and there is apparently no tendency for such dirt or sediment tofcollect uponthis' bevel port-ion, because it is 'v always found in the bottom of the valve chamber and I'have experienced no trouble .whatever from dirt clogging the opening 226. I prefer to provide this chamber with an opening through which the sediment can be flushed from the valve chamber. This opening may be closed by a suitable threaded plug 232.

The filters 114 and 131 are so positioned relatively to each other that the filter 114 removes all of the coarser particles of dirt from the oil before it passes through the filter 131. The meshes of this last-mentioned filter are made so fine that any particle of dirt passing therethrough will readily pass through the opening 226 when the valve is set inits minimum discharge position. In this manner the valve is protected against clogging by a particle of dirt larger than its effective openlng.

For the purpose of providing the proper quantity of air to be mixed with the oil spray discharged from the atomizing edge of the rotary atomizingnozzle so as tov produce al most eiiicient combustion of the oil, I provide the upper end of the atomizing nozzle with a plurality of radially extending fan blades or vanes 235, which are preferably under-cut, as shown at 236, as I find by this construction the fan blades work muchmore efficiently. Surrounding the' fan blades 236 lll is a fiat air-controlling ring 237 which is supported by the upper' end of the sleeve 238. The upper edge of this sleeve is provided with a plurality of spaced notches or openings 239. The upper end of the bore of the sleeve 238 is tapered outwardly, as clearly shown in Figure 3, to provide a seat for the correspondingly beveled boss 240 projecting downwardly from'the lower side of the air ring 237 for a purpose which will be referred to later on. The lower edge of the sleeve 238 is provided with a plurality of inclined cam surfaces 241 which ride upon the rollers 242 that are in turn mounted upon the neck ring 39 by the screws 243 (see Fig. 5). The sleeve 238 is further provided with a downwardly ext-ending lug 244, the lower end of which is secured to a bracket 245. A link 246 (see Figs. 1 and 5) is secured to the outer end of the barcket 245 by means of a pivot pin 247, so that, when the link 246 is moved in one direction, the cam faces 241 will ride upwardly on the rollers 242 and cause the notches or openings 239 in the sleeve 238 to be more or less uncovered at the upper edge of the neck ring 39,'thus permitting a larger or smaller .supply of air to be supplied to the flame under the natural draft through the furnace in addition tothe air supplied to the flame by the fan blades 235.

Asfthe air ring 237 is moved upwardly to .block off more of the fan blades 235, the volume of air discharged by the fan vanes is decreased although the Velocity may to a certain extent be increased. At the same time the raising of the air ring 237 increases the discharge air of the openings or ports 239 which permits aI greater liow of air'under natural draft. Thus when the air ring 237 is raised or lowered, the upper or forced draft will be varied oppositely to the lower or natural draft air supply. n

The means which I have provided for regulating the velocity of the air, as well as the quantity, is of very considerable importance, because, when a large quantity of oil is being atomized, it, of course, requires a greater I quantity of air for its complete combustion and at the same time the velocity of the air should bel increased to carry the oil spray away from the atomizing edge of the nozzle before lit becomes ignited so that the region of combustion is not immediately adjacent the oil burner, but at some distance therefrom, so as to relieve the atomizing nozzle of the intense heat of the flame. However, if no means are provided for changing the velocity of the air when the smaller quantity of oil is being burned, the result is that the flame is eXtinguished. Therefore, by providing means by which 'the velocity and volume of the air can be simultaneously increased or decreased, I have made it possible to efficiently adjust the quantity of air to the vquantity of oil being burned, thereby producing a most efficient combustion of the oil.

It will also be seen that I have provided means for supplying air to the llame under the natural draft of the furnace so that as upper face of the air ring 237 from running down into the sleeve 238 or the neck ring 39.

I shall now describe the operation of my burner thus far described. When the motor 21 is placed in operation, the atomizing nozzle will be caused to rotate at a high rate of speed, this speed varying with the diameter of the atomizing nozzle and the quantity of oil to be atomized. The gear pump will draw oil from the main supply tank through the hollow conduit 119 in the head of the machine, thereby cooling the hollow conduit and the associated parts of the machine. The oil then passes through the pump and the strainers and is forced out through the standpipe and onto the inner wall of the atomizing nozzle, as' described above. The oil then moves upwardly along the inner wall of the atomizing nozzle, spreading out into a thin film as it progresses and is finally discharged from the atomizing edge 95 in a thin spray. Here it meets with the air discharged from the fan blades 235 and forms a combustible mixture of oil and air, which, if necessary, receives an additional supply of air through the notches 239v under the natural draft of the furnace.

By adjusting the screw 190 of the'control oilregulating valve, the quantity of oil supplied to the atomizing nozzle can be controlled, as desired, and by properly adjusting the sleeve 238 by means of the link 246, the quantity and velocity of the air supplied to the oil spray canalso be properly controlled so that a practically white flame with no smoke and no appreciable odor can be produced.

The oil in passing through the hollow bosses 118 and 120 and the conduit 119 of the head absorbs the heat from the head, thereby cooling it and causing the oil to be rendered more liquid so that it can be more readily atomized by the burner.

In order to make it possible to automatically control the temperature of a building or other structure heated by my improved burner, I provide means whereby a thermostatically-controlled motor or any other thermostatically-controlled means can be used for automatically varying the quantity of oil consumed. It has heretofore been proposed to thermostatically control oil burners so as to produce alternate intervals of time during which the burner does or does not operate, as the case may be, Ain which case pilot lights or equivalent means are provided for lighting the oil'spray each time the burner is placed in operation. Such a system is objectionable, iirst,because it requires the use of a pilot light or some other equivalent device. This method of igniting the oil spray has not proved entirely reliable and has been the cause of explosions and other disagreeable incidents, such as the flooding of a furnace with the fuel oil'. I have also discovered that the coating of the interior of an,

atomizing nozzle with carbonized oil is produced generally by the drying of a thin film of oil left upon the rotary atomizer each time the flame is extinguished. Whenever the rotary a'tomizer is stopped, a thin film of oil remains upon the inner wall of the atomizer and there is usually suicient heat left in the atomizing nozzle itself and in the walls of thev furnace to .cause this thin film of oil to bake upon the inner wall of the atomizing nozzle, and every time the atomizing nozzle is put in operation and then stopped, an additional layer of carbonized oil it added to that already deposited upon the burner, until, in due course of time, unless some other means are used for preventing it, a thick deposit lof oil will accumulate upon the atomizing nozzle and render it useless. The ideali way to operate an oil burner would be to have it supply just the amount of heat required at any instant, which would permit the burner to be burned continuously and not givenany opportunity for a film of oill to bake upon its inner wall. It is, however, 1mpracticable to regulate an oil burner so that it supplies just exactly the right amount of heat required where this amount is a varying quantity, and I have, therefore, 'provided means whereby the burner can be operated continuously, but at two different rates, one causing a minimum rate-of consumption of oil and the other causing a maximum rate of consumption of oil, the two intervals being so controlled that the average temperature produced will be approximately that .required. This means that part of the time theburner must be consuming less oil than is required for the purpose in zhand and at another time burning more oil than is required, thus making it possible to continuously operate the burner and thus prevent the formation of carbonized oil deposits upon the atomizing nozzle., In carrying out this scheme, I provide means for. not only changing the oil flow from a maximum to a minimum quantity, and vice versa, but also for correspondingly changing the supply of air to the burner, so that at all times the proper quantity of air for most efficient combustion is being furnished to the burner.

In carrying out the above idea, Isecure a cap 250 to the top of the stem 195 of the valve adjusting screw 190 and provide it with ka transverse bore for receiving one end of the rod 251 which is adjustably held in the bore by a suitable set screw 252. Slidably mounted upon the rod 251 is a sleeve 253 which is held in any adjusted position by means of a set screw 254. The sleeve 253 has a laterally extending boss 255 which carries a pivot pin 256, to the lower end of which is secured a sleeve 257 `for adjustably receiving the link 258. The link is held in its adjusted position by means of a set screw 259 extending through the wall of the sleeve and pressing against the link. The other end of the link 258 forms a pivot connection with the upwardly offset end 246 of the link 246, thereby establishing a link connection between the air and the oil controlling means. The link 246 is guided in its movement by a pair of spaced rollers 260 which are rotatably mounted upon pins 261 extending upwardly from the bracket 262. The bracket 262 is `in turn mounted upon a switch box 263. The switch box 263 is carried by a bracket 264 which is secured to the flange 23 of the side rail 16-of the main bed plate. The bracket 262 extends laterally, `as shown in Figures 1 and 4, and at its outer end provides a bearing for the lower end of the rod 265, the lower end ofthis rod being rounded where it is journaled in the bracket 262. A sleeve 266 is adjustably mounted upon the rod 265 and held in adjusted position by a set screw 267. An arm 268 is secured to and projects inwardly from the sleeve 266. A link 269 is pivotally connected with the inner end .of the arm 268, as shown at 270. The other end ofthe link 269 is pivotally connected with the link246, as shown at 271. From the above construction, it will be seen that when the rod 265' is rotated in one direction, Ait will cause the link 246, by reason of the latters link connection with both the air and oil-controlling means, to diminish the supply of air and oil to the burner and that when the rod 265 is rotated in the opposite direction, the supply of air and oil to the burner will be increased. It will also be seen that if theA movement of the rod 265 in each direction is limited, then the extent to 'which the oil-control valve is opened or closed will be determined by the adjustment of the rod 251 relatively to the stem of the valve adjusting screw and the l adjustment of the' link 258 relatively to the .ment of the burner, I provide an electric motor having a housing 272, through the opposite ends of which theshaft 273 of the motor projects. This housing also contains suitable electrically controlled switches for causing the motor alternately to revolve the shaft 273 predetermined distances in opposite directions, these switches being controlled by the thermostat 274. The construction of the thermostat and the switch mechanism contained in the housing 272 is well-known and need not be further described, except to state that when the temperature measured by the thermostat falls to a predetermined low degree, the motor will cause the shaft 273 to move in one direction and when it rises to a predetermined high degree, the thermostat will cause the motor to rotate a predetermined dist-ance in the opposite direction. Se,- cured tothe opposite ends of the shaft 273 are a pair of grooved pulleys 275 to which are secured the lower ends of chains 276. The vupper ends oit these chains pass around pulleys 277 and then in a substantially horizontal direction to the opposite ends of the lever 278. The lever 278 is mounted intermediate its ends upon the upper end of the rod 265 which is journaled in a suitable support 279. From the above construction, it will be apparent that when the motor rotates in one direction, the lever 278 will be rotated in the horizontal plane inthe corresponding direction, and that when the direction of rotation of the motor is reversed, the lever,278 will correspondingly change the direction of its movement. By this means I have been able to 4cause the burner to operate during successive intervals of time at either a predetermined minimum or predetermined maximum rate, and the thermostat 274 will so control these intervals of time as to preserve approximately constant temperature. The valve 150 is to be used for completely shutting ofi' the supply of fuel oil. to the burner.

To provide means for 'automatically stopping the burner in the event the blaze should for any reason become extinguished, and to thus prevent the furnace from becoming completely flooded with unconsumed oil, I provide the annular trough with a spout 280` (see Figs. 1 and 3) into which the oil from` the trough 40 can run through the opening 40. The spout 280 is supported from the trough 40 by means of the threaded bolt 281. The discharge end of the spout 280 isso arranged that any oil passing therethrough will drop into the bucket 282 which is supported upon the inner end of the lever 283. `This lever 283 is pivotally mounted upon a pin 284, which is secured to a slide 285 which is confined between a guide plate 286 and one end of the switch box 263 (see Figs. 3A and 13). The pin 284 projects through a slot 287 formed in the guide plate 286. A spring pressed plunger 288, carried by a. bracket 289 secured to the lower end of the switch box 263, yieldingly holds the lever 283 in its uppermost position. The outer end of the lever 283 is offset downwardly, as shown at 283 (Fig. 3A), so that when its inner end is held in its uppermostposition, the outer end will just clear the pin 290 which projects from one side of the grooved pulley 221. When, however, oil draining down through the fire bed of the furnace runs into the trough 40 and then into the spout 280 and drops into the bucket 282, the inner end of the arm 283 will descend, thus causing the outer end 283 of the lever to be positioned in the path of the pin 290. The pin, upon encountering the end of the lever, pushes it bodily inwardly and thus causes the lateral extension 285 of the slide 285 to move in a direction to press the switch button 291 inwardly, thus operating the switch to cut o the supply of current to the motor and thus stopping the motor. The extension 285 of the slide 285 is provided with an adjustable screw 292 which can be adjusted to make contact with the end of the switch button 291. AThe details of construction of the switch comprising the button 291 are not illustrated, as any of the well-known types of two-button switches can be placed in the housing 263 and used for the purpose described.

Before the operator can again start the motor, it is necessary for him to remove the oil from the bucket and move the outer end of the lever 283 out of the path of the pin 290 and to then move the entire lever bodily outwardly so as to cause the lateral extension 285 to permit the operation of the switch to close the circuit of the motor.

To lubricate the moving parts contained in the head of the burner, I provide the head with the removable closure 293 which, when in place, assists in forming a well for a supply of lubricating oil which will submerge the anti-friction bearing 89, and when the machine is not in operation, will also submerge the pinion 91. For the purpose of permitting the lubricating oil to circulateso as to make it possible to keep a' comparatively large quantity of lubricating oil in the head, I provide one side wall of the head with a depression orconcavity 294 (see Fig. 5) which opens into the interior of the head and into which lubricating oil is thrown by the teeth of the gear 87. A retaining wall 295 prevents the direct return of the oil to the interior of the head and directs it through an opening 296 in the inner wall 297 of av conduit 298 formed integrally with the enclosure 83 of the head and extending transversely thereof, as indicated in dotted outline in Figure 5. At a point lying approximately below the shaft 77, the inner wall is provided with a second opening 299 of considerably smaller size than the opening 296 which returns the oil from the conduit 298 to the interior of the head. In this manner a somewhat considerable quantity of oil can be kept in constant circulation so that dierent portions of it will be effective in lubricating the various moving parts contained in the head, but at no time will there be any considerable quantity of oil in contact with the teeth of the gear 87 and the pinion 91. I thereby eliminate the loss of` any considerable amount of power caused by the gears 487 and 91 threshing arlound in a considerable body of lubricating o1 Some of the oil thrown 0E the gear 87 will drain down into the passageway 300 formed in the end closure 83 and lubricate the two sleeves 80 and 81 and the shaft 77. Another portion of the oil thrown off the top of the gear 87 will thoroughly lubricate the upper anti-friction bearing 88.

The upper end of the spindle 90 is provided with an enlargement 90 having facets for co-acting with the jaws of a wrench so that the spindle 90 can be held stationary v while the atomizing nozzle is being unscrewed therefrom and I have discovered that these 'facets act as fans and cause more or less of a vacuum adjacent thereto, which causes the oilto be drawn upwardly from the bearings 88. To prevent this I provide the upper end of the spindle 90 with an annular shoulder 301 having a sharpened edge which tends to throw oil off the spindle. I also cut away .the facets, as shown at 302, to lessen the fan action. A collar 303 holds the anti-friction bearing 88 in place.

To prevent the contamination of the lubricating oil inthe head by the accident-al mixture therewith of any fuel oil which might by accident drain downwardly through the spindle 90 from the atomizing nozzle 93, I interpose between the spindle and the standpipe a thin walled tube 304 which is held in place by the collar 305 threaded into the lower side of the head. I make the space between the tube 304 and the standpipe 158 as large -as ossible to permit an adequate supply of air eing drawn up through the spindle and the tube 304 to the atomizing nozzle as heretofore described. A thimble 306 supported bytube 304. To supply lubricating oil to the l head, I provide the pipe 310 which has a three-part union 311 intermediate its end, the outer end of which is provided with a suitable cup 312 for receiving the lubricating oil and conducting it to the pipe 310. This cup 312 also acts as an overfiow to limit the level of the lubricating oil in the head of the burner.

The part of my machine which receives the most wear and which may, therefore, have to be replaced from time to time is the spindle 90 and its bearings. To facilitate the repair of the machine when this becomes necessary, I have provided the detachable connection between the shafts 73 and 77 and placed the union 311 in the pipe 310. Corresponding unions 313 and 314 are placed in the pipes 117 and 121, respectively, so that when it becomes necessary to replace the spindle or its bearings, the detachable connection between the shafts 73 and 77 can be disconnected. The several unions 311, 313 and 314 can be opened and the head completely removed from the machine. Before this can be done, it is, however, necessary to remove the atomizing nozzle, the ring 237 and the extension 161 of the standpipe from the machine, whereby the head and the contained spindle can be lifted upwardly, leaving the standpipe 158 in place, and thence outwardly from beneath the furnace. The head itself is supported by a pair of brackets 315 and 316 pins 317 and 318 which connect the brackets 315 and 316 with the flanges 33 and 32, respectively, (see Fig. 5). Screws 319 may also be-used for securing the brackets to the flanges 33 and 32.

An inverted trough-shaped cover 320 may be used for enclosing the shaft 73.

It is a comparatively dicult matter in the commercial manufacture of a machine of this type to exactly align the two antifriction bearings 88 and 89 and heretofore there has always been more or less binding upon the elements of these bearingsvwhich resulted in more or less objectionable heatingI of the bearings. I have, therefore, provided means for permitting these bearings to properly align with each other and thus relieve them of the strains heretofore imposed thereon and from the consequent heating. This construction is Iclearly illustrated in Figures 6 and 8, in which the outer race 320 is yieldingly supported by a flexible ring 321 having the alternating lugs 322 and 323 extending therefrom in opposite directions. The outwardly extending lugs engage the seat 324 formed in the head, and the inner lugs engage the outside of the outer race 320.

This -construction permits the portions of so that the two anti-friction bearings 88 and l 89 are yieldingly, but freely, supported so that they can align with each other without subjecting the parts thereof to stresses tending to cause heating This type of suspension also results in a quieter operating machine. v

Branch pipes 325 andr 326, respectively, leading from the discharge pipe 149 from the regulating or control valve, and from the end ure 3), can be placed around the enlarged portion 90 of the spindle and the outer end lof the wrench held stationary by engagement by said rails, the central portions of said auxiliary bed plate being depressed, a hollow head supported from said auxiliary bed plate, said hollow head comprising a cooling duct, an atomizing nozzle rotatably supported by said hollow head, a pump supported by said table, connections extending from said pump to said cooling duct and said atomizing nozzle, and a motor for driving said pump and atomizing nozzle, said motor being mounted in the depression in said bed plate.

2. An oil burner comprising an elongated bed plate one end of which comprises a depression, the longitudinal sides of which are extended in the form of a pair of parallel rails, a table projecting laterally from one of said rails, an auxiliary bed plate supported by said rails, the central portions of said auxiliary bed plate being depressed, a hollow head supported from said auxiliary bed plate, an atomizing nozzle rotatably supported by said hollow head, a pump supported by said table, connections extending from said pump to said atomizing nozzle, and a motor for driving said pump and atomizing nozzle, said motor being mounted inthe depression in said bed plate.

3. An oil burner comprising an elongated bed plate one end of which comprises a depression, the longitudinal sides of which are extended in the form of a pair of parallel rails, an auxiliary bed plate supported by said rails, the central portions of said auxiliary bed plate being depressed, a hollow head supported from said auxiliary bed plate, an atomizing nozzle rotatably supported by said hollow head, a pump, connections extending from said pump to said atomizing nozzle, and a motor for driving said ump and atomizing nozzle, said motor eing mounted in the depression in said bed plate.

4. An oil burner comprising an elongated bed plate-one end of which comprises a depression, the longitudinal sides of which are extended in the form of a pair of parallel rails, a hollow head supported from said bed plate, an atomizing nozzle rotatably supported by said hollow head, a pump, connections extending from said pump to said atomizing nozzle, and' a motor for driving said pump and atomizing nozzle, said motor bing mounted in the depression in said bed p ate.

5. An oil burner comprising a hollow spindle having a hollow centrifugal atomizing nozzle mounted on one end, a fuel supply stand pipe extending through said spindle in spaced relation thereto and projecting into the inner end of said atomizing nozzle, said stand pipe having a discharge port adjacent its outer end, means located at the bottom of said atomizing nozzle for creating a draft of air between said standpipe and hollow spindle and lout through said nozzle comprising, a plurality of radially extending fan vanes, the inner edges of which are spaced from said standpipe to form a space for the entry of air, an annular collar surrounding said standpipe and securing the outer ends of said vanes together, said collar having an annular groove cut in its outer face, and openings formed in its outer wall and communicating with said groove, and a cap mounted on the outer end of said fuel supply pipe in position to receive the oil discharged from the port in said fuel supply pipe, the flange of said cap extending to a position adjacent the bottom of said groove.

6. An oil burner comprising a hollow spindle having a hollow centrifugal atomizing nozzle mounted on one end, a fuel supply stand pipe extending through said spindle in spaced relation thereto and projecting into the inner end of said atomizing nozzle. said stand pipe having a discharge port adjacent its outer end, means located .at the bottom of said atomizing nozzle for creating a draft of air between said standpipe and hollow spindle and out through said nozzle comprising, a plurality of radially extending fan vanes, the inner edges of which are spaced from said standpipe to form a space for the entry of air, a cap mounted on the outer end of said fuel supply pipe in position for receiving the los supply pipe, and means for receiving oil from said cap and transferring'it in a stream io the inner surfaceA of said atomizing nozzle so as said openings to be uncovered.

not to interfere with the outward discharge of air from said fan vanes.

7 An oil burnervcomprising a hollow spindle having a hollow centrifugal atomizing nozzle mounted on one end, a fuel supply stand pipe extending through said spindle in spaced relation thereto and projecting into the inner end of said atomizing nozzle, said stand pipe having a discharge port adjacent its outer end, and means located at the bottom of said atomizing nozzle for creating a draft of air between said standpipe and hollow spindle'and out through said nozzle comprising, a plurality of radially extending fan vanes, the inner edges of which are spaced from said standpipeto form a space for the entry of air.

8. An oil burner comprising a hollow rotary atomizing nozzle having fan vanes extending therefrom adjacent its atomizing edge, a neck ring surrounding said atomizing nozzle in spaced relation thereto, anadjustable air ring reciprocable in said neck ring, the outer edge of said air ring being provided with openings, an air diverting ring surrounding said fan vanes and mounted on the outer edge of said air ring, said air lring having a rib extending downwardly in said air ring and partially closing said openings, and means for moving said air ring in and out in said neck ring to cause more or less of 9. An oil burner comprising a hollow rotary atomizing nozzle having fan vanes extending therefrom, a neck ring surrounding said atomizin nozzle in spaced relation thereto, an adjustable air ring reciprocable in said neck ring, the outer edge of said air ring being provided with openin s, an air diverting ring surrounding said an vanes and mounted onthe outer edge of said air ring, and means for moving said air ring inA andout in said neck ring to cause more or less of said openings to be uncovered.

10. An oil burner comprising a rotary hollow spindle, an atomizing nozzle secured to one endof said spindle and having an opening through its bottom, a fuel standpipe extending through said hollow spinde and said opening, and provided with an opening for discharginl fuel into said atomizing nozzle, a support or said spindle having an oil well communicating with the bottom offsaid spindle, and a tube secured to the bottom of said oil well and extending between said spindle and standpipe and in spaced relation to said standpipe to form an air passage. e .f

11. 'An oil burner comprising an elongated tubular atomizer nozzle, the upperendk of which is provided with an outwardly extending flange, air vanes secured to said atomizer nozzle beneath said flan e, a plurality'ofy spaced annular radiator `.ns secured to said atomizer nozzle below said air vanes, a neck ring surrounding said atomizer in spaced relation thereto to form an annular air conduit between it and said atomizer nozzle, a sleeve carried by'said neck ring, means for adjusting said sleeve up and down relatively to said neck ring, anair controlling ring surrounding said air vanes and supported by said sleeve, means for rotating said nozzle, means for supplying oil to the lower end thereof, an air conduit communicating with the lower end of said atomizing nozzle, and means carried by said atomizing nozzle for inducing a flow of air through said conduit and said atomizing nozzle.

l2. An oil burner comprising a rotary atomizer nozzle having a dischargeedge, air vanes secured to said atomizer nozzle beneath said discharge edge, a plurality of radiator iins secured to said atomizer nozzle below said air vanes, a sleeve surrounding said atomizer in spaced relation thereto to form an annular air conduit between it and said atomizer nozzle, means` for. adjusting said sleeve up and down, an air controlling ring surrounding said air vanes, means for supporting said air controlling ring on said sleeve and in spaced relation to a part thereof to form a natural draft passageway, means for rotating said nozzle, and means for supplying oil to the lower end thereof.'

13. An oil Aburner y comprising a tubular atomizing nozzle having an outwardly flaring end, an air ring surrounding saidatomizing nozzle to form an annular air conduit, a sleeve adjustably supported on said ring, an air controlling ring adjustably supported on the upper side of said ring and in spaced relation thereto to form anatural draft passageway, means carried by said atomizer nozzle outwardly beyond said passageway, for inducing a draft of air past the atomizing edge of said atomizing nozzle, and means for supplying fuel to the interior of said atomizing nozzle.

14. An oil burner comprising a tubular atomizing nozzle, a neck ring surrounding said atomizing nozzle to form an annular air conduit, a sleeve adj ustably supported on said l neck ring, an air controlling ring adjustably supported on the upper side of said ring and 1n spaced relation thereto to form a natural draft passageway, means carried by said atomizer nozzle for inducing a draft of air past the atomizing edge of said atomizing nozzle, and means for supplying fuel to the interior of said atomizing nozzle.

.' 15. An oil burner comprising a rotary spindle, an atomizing nozzle secured thereto,

a plurality of annular radiator fins adjustably mountedupon said spindle in spaced relation to each other, said radiator fins being heavier on one side than the other, whereby so that the two anti-friction bearings 88 and 89 are yieldingly, but freely, supported so that they can align with each other without subjecting the parts thereof to stresses tending to cause heating This type of suspension also results in a quieter operating machine. I

Branch pipes 325 andr 326, respectively, leading from the discharge pipe 149 from the regulating or control valve, and from the end ure 3), can be placed around the enlarged portion 90 of the spindle and the outer end foi the wrench held stationary by engagement with a pin 333 extending upwardly from a bracket 334 forming a part of the outer cover plate 83, the wrench handle preferably being provided with an opening for receiving the pin 333. l

What I claim as new, and desire to secure by Letters Patent of the United States, is:

1. An oil burner comprising an elongated bed plate one end of which comprises a depression the longitudinal sides of which are extended in the form of a pair of parallel rails, a -table projecting laterally Afrom one of said rails, an auxiliary bed plate supported by said rails, the central portions of said auxiliary bed plate being depressed, a hollow headsupported from said auxiliary bed plate, said hollow head comprising a cooling duct, an atomizing nozzle rotatably supported by said hollow head, a pump supported by said table, connections extending from said pump to said cooling duct and said atomizing nozzle, and a motor for driving said pump and atomizing nozzle, said motor being mounted in the depression in said bed plate.

2. An oil burner comprising an elongated bed plate one end of which comprises a depression, the longitudinal sides of which are extended in the form of a pair of parallel rails, a table projecting laterally from one of said rails, an auxiliary bed plate supported by said rails, the central portions of said auxiliary bed plate being depressed, a hollow head supported from `said auxiliary bed plate, an atomizing nozzle rotatably supported by said hollow head, a pump supported by said table, connections extending from said pump to said atomizing nozzle, and a motor for vdriving said pump and atomizing nozzle, said bed plate one end of which comprises a depression, the longitudinal sides of Which are extended in the form of a pair of parallel rails, an auxiliary bed plate supported by 'said rails, the central portions of said auxiliary bed plate being depressed, a hollow head supported from said auxiliary bed plate, an atomizing nozzle rotatably supported by said hollow head, a pump, connections extending from said pump to said atomizing nozzle, and a motor for driving said ump and atomizing nozzle, said motor ein-g mounted in the depression in said bed plate.

4. An oil burner comprising an elongated bed plate one end of which comprises a depression, the longitudinal sides of which are extended in the form of a pair of parallel rails, a hollow head supported from said bed plate, an atomizing nozzle rotatably supported by said rhollow head, a pump, connections extending rom said pump to said atomizing nozzle, and a motor for driving said pump and atomizing nozzle, said mot-or bing mounted in the depression in said bed p ate.

5. An oil burner comprising a hollow spindle having a hollow centrifugal atomizing nozzle mounted on one end, a fuel supply stand pipe extending through said spindle in spaced relation thereto and projecting into the inner end of said atomizing nozzle, said stand pipe having a discharge port adjacent its outer end, means located at the bottom of said atomizing nozzle for creating a draft of air between said standpipe and hollow spindle and out through said nozzle comprising, a plurality of radially extending fan vanes, the inner edges of which are spaced from said standpipe to form a space for the entry of air, an annular collar surrounding said standpipe and securing the outer ends of said vanes together, said collar having an annular groove cut in its outer face, and openings formed in its outer Wall and communicating with said groove, and a cap mounted on the outer end of said fuel supply pipe in position to receive the oil discharged from the port in said fuel supply pipe, the flange of said cap extending to a position adjacent the bottom of said groove.

6. An oil, burner comprising a hollow spindle having a hollow centrifugal atomizing nozzle mounted on one end, a fuel supply stand pipe extending through said spindle in spaced relation thereto and projecting into the inner end of said atomizing nozzle, said stand pipe having a discharge port adjacent its outer end, means located at the bottom of said atomizing nozzle for creating a draft of air between said standpipe and hollow spindle and out through said nozzle comprising, a plurality of radially extending fan vanes, the inner edges of which are spaced from said standpipe to form a space for the entry of air, a cap mounted on the outer end of said fuel supply pipe in position for receiving the supply pipe, and means for receiving oil from said cap and transferring itin a stream io thc inner surface of said atomizing nozzle so as not to interfere with the outward discharge of air from said fan vanes.

7 An oil burner comprising a hollow spindle having a hollow centrifugal atomizing nozzle mounted on one end, a yfuel supply stand pipe extending through said spindle in spaced relation thereto and projecting into the inner end of said atomizing nozzle, said stand pipe having a discharge port adjacent its outer end, and means located at the bottom of said atomizing nozzle for creating a draft of air between said standpipe and hol- 10W spindleand out through said nozzle comprising, a plurality of radlally extending fan vanes, the inner edges of which are spaced from said standpipeto form a space for the entry of air. I

8. An oil burner comprising a hollow rotary atomizing nozzlehaving fan vanes eX- tending therefrom adjacent its atomizing edge, a neck ring surrounding saidl atomizing nozzle in spaced relation thereto, an adjustable air ring reciprocable in said neck ring, the outer edge of said air ring being provided with openings, an air diverting ring surrounding saidffan vanes and mounted on the outer edge of'said air ring, said air ring having a rib extending downwardly in said air ring and partially closing said openings, and means for moving said air ring in and out in said neck ring to cause more or less of said openings to be uncovered.

9. An oil burner comprising a hollow rotary atomizing nozzle having fan vanes extending therefrom, a neck ring surrounding said atomizin nozzle in spaced relation thereto, an adjustable air ring reciprocable in said neck ring, the outer edge of said air ring being provided with openings, an air diverting ring surrounding said fan vanes and mounted on the outer edge of said air ring, and means for moving said air ring in and'out in said neck ring to cause more or less of said openings to be uncovered.

10. An oil burner comprising a rotary hollow spindle, an atomizing nozzle secured to one end of said spindle and having an opening through its bottom, a fuel standpipe eX- tending through said hollow spinde and said opening, and provided with an opening for discharginl fuel into said atomizing nozzle, a support or said spindle having an oil well communicating with the bottom of said spindle, and a tube secured to the bottom of said oil well and extending between said: spindle andstandpipe and in spaced relation to said standpipe to form anair passage.

11. An oil burner comprising an elongated tubular atomizer nozzle, the upper end of which is provided with; an outwardly extending flange, air vanes secured to said atomizer nozzle beneath said Han e, a plurality of spaced annular radiator ns secured to said atomizer nozzle below said air vanes, a neck ring surrounding said atomizer in spaced relation thereto to form an annular a'ir conduit between it and said atomizer nozzle, a sleeve carried by'said neck ring, means for adjusting said sleeve up and down relatively to said neckring, anair controlling ring surrounding said air vanes and supported by said sleeve, means for rotating said nozzle, means for supplying oil to the lower end thereof, an air conduit communicating with the lower end of said atomizing nozzle, and means carried by said atomizing nozzle for inducing a flow of air through said conduit and said atomizing nozzle.

12. An oil burner comprising a rotary atomizer nozzle having a discharge edge, air vanes secured to said atomizer nozzle beneath said discharge edge, a plurality of radiator fins secured to said atomizer nozzle below said air vanes, a sleeve surrounding said atomizer in spaced relation thereto to form an annular air conduit between it and said atomizer nozzle, means for adjusting said sleeve up and down, an air controlling ring surrounding said air vanes, means for supporting said air controlling ring on said sleeve and in spaced relation to a part thereof to form a natural draft passageway, means for rotating said nozzle, and means for supplying oil to Athe lower end thereof.

13. An` oil -burner comprising a tubular atomizing nozzle having an outwardly flaring end,an air ring surrounding saidatomizing nozzle to form an annular air conduit, a sleeve adjustably supported on 'said ring, an air controlling ring adjustably supported on the upper side of said ring and in spaced relation thereto to form a natural draft passageway, means carried by said atomizer nozzle outwardly beyond said passageway, for inducing a draft of air past the atomizing edge of said atomizing nozzle, and means for supplying fuel to the interior of said atomizing nozzle.

14.1,. An oil' burner comprising a tubular atomizing nozzle, a neck ring surrounding said atomizing nozzle to form an annular air conduita sleeve adj ustably supported on said A neck ring, an air controlling ring adjustably supported on the upper side of said ring and 1n spaced relation thereto to form a natural draft passageway, means carried by said atomizer nozzle for inducing a draft of air past the atomizing edge of said atomizing nozzle, and means for supplying fuel to the interior of said atomizing nozzle.

15. An oil burner comprising a rotary spindle, `an atomizing nozzle secured thereto, a plurality of annular radiator fins adjustably mounted upon said spindle in spaced relation' to each other, said radiator fins being heavier on one side than the other, whereby

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