US1649416A - Gas range - Google Patents

Description

Nov; 15, 1927.

H. w. ODOWD.

GAS RANGE Filed April 2) L925 3 Sheets-Sheet l t INVENTOR ATTORNE S Npv. 15, 1927.

1,649,416 H. w. .ODOWD I GAS RANGE I Filed April 2 2 I 3 Sheet-Sheet 2 IINVENTOR 77- 0 M I I 55 25 BY TromzYs Nov. 15, 1927.

H. w. o DOWD GAS RANGE Filed April 2, 1925 s Sheets-Sheet s.

AT ORNEYJ' Patented Nov. 15, 1927.

UNITED STATES PATENT OFFICE.

HENRY W. ODOWD, JERSEY CITY, NEW JERSEY, ASSIGNOR TO. STANDARD GA! EQUIPMENT CORPORATION, A CORPORATION OF MARYLAND.

GAS RANGE.

Application filed April 2, 1925. Serial No. 20,023. g

\ This invention, while capable of more general application, relates more particularly to ranges of the type covered by my prior Letters Patent No. 1,403,814. Generally speaking, these ranges include a closed smooth surfaced cooking top, a single combustion or heat generating chamber underlying the top and substantially co-extensive therewith, and a plurality of Bunsen burners-mounted exclusively in the forward part of the combustion chamber, said chamher having an inlet at the front for secondary air and an outlet at the back for the products of combustion, ,all as set forth in detail .in the above patent. The purposes and advantages of such an arrangement are.

also fully discussed in the patent, so that it will be superfluous to repeat them here.

The'primary object of the present invention is to increase the efliciency of gas ranges of this type, and the invention is directed to certain improvements in the various parts having that general object in view. One of the characteristic features is the provision of a burner plate arranged-between the burners and the cooking top and.

a lower secondary air chamber open at the front and containing the burners, which latter are arranged with their gas orifices in registry with the secondary air nozzles so as to direct the flame jets vertically through the openings of said nozzles into the combustion chamber and up against the forward portion of the cooking top. Actual practice has shown that a range constructed in this'manner is extremely eflicient, giving a maximum heating effect witha minimum consumption of fuel. Another chanad teristic feature is the provision of a novel form of flue which draws ofl the products of combustion in a manner which ensures the proper ventilation of the combustion chamber without involving any unnecessary wastage of heat. These and other improvmerits Will be fully set forth in the detailed description to follow.

In the drawings:

Fig. 1 is a vertical sect'on, taken on the line 11 of Fig. 2, of a gas range equipped with the, present improvements;

Fig. 2 is a top plan view taken on the line 2-2 of Fig. 1, parts being broken away;

Fig. 3 is a vertical longitudinal section taken at the front to show the burner ar rangement;

Fig. 4 is an enlarged fragmentary vertical section taken on .the line 4-4 of Fig. 5, showing the manner of supporting the bug ners; fr l I i.5isa a entar to an view showing further defils of the biirriiar mountmg;

Fig. 6 is an enlarged vertical cross-section taken on the line 66 of Fig. 4, showing the relation of the burner and burner plate;

Fig. 7 is a front elevation of the improved flue detached, parts being broken away to show the interior;

Fig. 8 is a section taken on the line 8-8 of Fig. 7; and

Fig. 9 is a front elevation of a modified form of flue, parts being broken away. i

The body of the range, denoted as a whole by reference numeral 1, may be of any suitable shape or design. In the present instance, the range comprises an oven 2 and a closed smooth surfaced top 3, the latter being arranged above and in spaced relation to the top wall 4 of the oven and extended rearwardly beyond the back wall '5. The rear extension of the cooking top carries a splasher 6 having the customary side arms 7 and the warming shelf 8, and at the rear of such splasher, it is formed throughout its length with a series of outlet openings orv vents 9 adapted to discharge into a fine, subsequently to be described, the products of combustion from both the top burners and the oven burner. At this point it may be noted that the products of combustion from theoven pass off through a top flue 10 communicating at the rear through openings 11 a narrow assage 13 registering with the vents 9.. he ocket 12 is constituted in part .by a box-like sheet metal structure 14 supported at the rear of the range and extending entirely acrossthe same from one side to the other; and located within this box-like structure is a sheet metal partition plate presenting a vertical portion 15, which constitutes the front wall of the pocket 12,

9 with an outlet chamber or pocket 12, having and a horizontal portion 16, which constitutes the top wall and which has an upturned portion 17 to provide the passage 13 above referred to. v

A burner plate 18- (preferably made of cast iron) is located in the space between the closed cookin top 3 and the oven top' wall 4 and provi es in effect an upper unobstructed combustion or heat generating chamber 19 and a lower secondary air chamber 20, the burner plate thus constituting the floor or lower wall of the combustion chamber and the upper wall of the secondary air chamber. As best shown in Figs. 1 and 3, the burner plate is arranged in close parallel relation to the overlying cooking top so as to provide a shallow combustion chamber which will serve to heat the entire top whether one or more of the burners are in operation at a time. For reasons which will presently appear, the burner plate is designed to exclude secondary air from the combustion chamber except that which is entrained by the flame jets; hence its front edge 21 and side edges 22 are turned upwardly to engage the under side of the cooking top (see Figs. 1 and 3). The rear edge 23 of the plate is not turned upwardly but rests upon the horizontal portion 16 of the partition plate above mentioned so as to allow the products of combustion from the chamber 19 to pass out through the vents 9 at the rear. Asa convenient means'of support, the side edges 22 of the burner plate are formed with: flanges 24 secured to the cooking top by bolts 25. As thus supported, the burner plate, being suspended from the top, may be removed therewith as a unit or, if desired, it may be removed independently of the top by unfastening the bolts 25. Beneath theburner plate 18 and within the secondary air chamber 20 are mounted a plurality of main heating Bunsen burners 26 (three in the present instance,see Fig. 3), which preferably are located exclusively in the part of the range forward of the longitudinal median line of the cooking top or the underlying combustion chamber (see Fig. 1). The burners may be of any suitable form and type, those herein shown being circular and each formed with a series of gas orifices or flame ports 28 which are vertically disposed so as to direct the flame jets upwardly at right angles to the top and thus allow the burners to be located in close proximity thereto. Extending forwardly from the respective burners are mixing tubes 29 provided with the customary primary air chambers 30 disposed in arow at the front of the range and into which gas is discharged from a common manifold 31 under the control-of separate valves or stop books 32. A small burner 33 is disposed toward the rear, although still within the air chamber 20, and is supplied with gas from the manifold 30 in the same manner. This burner 33 is employed simply to maintain a coffee percolator at the desired degree of heat, or for some similar purpose, and is too small to be used as a main heating burner. If desired, a pilot burner 34 of the swinging type shown or any other type may be employed to light the main burners.

Directly above the several Bunsen burners 26, the burner plate 18 is formed with localized secondary air inlets, one for each burner, these inlets in the preferred embodiment illustrated being in the form of series of nozzles 35 arranged in alignment with the gas orifices or flame ports 28 and having their bores or openings tapered upwardly, as shown in Fig. 6. Preferably and as shown, the gas orifices 28 terminate below, rather than project into, the lower ends of the air nozzles 35, this arrangement providing for the better aeration of the flame jets and enabling the inflowing air more effectively to insulate the gas orifices from the heat'of the flame jets and the hot walls of the air nozzles. As before intimated, the nozzles 35 constitute the sole means for admitting secondary air to the combustion chamber 19, so that the flame jets in being projected vertically through the nozzle openings are enabled to entrain whatever quantity of secondary air is required to support com-, 'bustion, and no more. The air chamber 20 being entirely open at the front will furnish an ample supply of secondary air under all conditions of use. It is pointed out (Figs. 1 and 4) that the secondary air nozzles 35 are formed upon depressed portions 36 of the burner plate, these depressions serving to catch and drain ofl grease and other substances which may fall into the combustion chamber from cooking utensils placed in the open spaces of the top. In this connection, 1

it may be noted that the cooking top as usual is provided above the burners with removable lids 3 which, when removed, enable the utensils to be exposed directly to the burner flames, if desired. Asimilar lid 3 is arranged above the percolator Burner 33, which latter is also adapted to project its flame jets into the combustion chamber through secondary air nozzles 37 While'the burners 26 may be supported in other ways, it is proposed to mount them in the following manner: The mixing tubes 28 are fitted over the fixed nozzles of the gas cocks 32 in the usual wayand receive support. at their front from the nozzles, from which the mixing tubes can be disengaged when the burners are to be removed by a burner plate 18. As best shown in Figs. 4

and 5, each burner 26 is provided at the rear with a thin upstanding lug 38 having an aperdifferent levels.

'opening 43 into which the slot leads, and depressed shoulders 44 arranged on opposite sides of the slot at the front of the rectangular opening. When the parts are assembled, as shown in Fig. 4, the lug 38 is arranged in the slot 42 with its apertured ear piece 39 projecting above the burner plate, the Wing portion 40 seats upon the .depressed shoulders 44, and the wing portion 41 engages the under side of the burner plate at the rear of the opening 43, the parts being held in this position by a cotter pin 45 passed through the ear piece 39 and engaging the rear upwardly sloping wall of the plate depression 36. By removing the cotter pin 45, the burner may be shifted rearwardly to disengage the parts, such movement placing the wing portion 40 in the rectangular opening .43 clear of the depressed shoulders 44 and disengaging the mixing tube from the gas nozzle, whereupon the burner is afforded no further support and may be lowered into the air chamber 20 and taken out the front. In replacing the burner, the operation is reversed, that is to say, the wing portion 40 is lifted up through the opening 43 and then carried forwardly over the depressed shoulders 44 and locked in place by the reinsertion of the cotter pin 45. It will be understood that the mounting of the mixing tubes 28 upon the gascock nozzles is such as to permit the fore and aft shifting of the burners in the manner above mentioned. This arran ement is not only useful in facilitating the removal and replacement of the burners, but is also advantageous in ensuring the proper relation between the burners and the burner plate, it being important. that the gas orifices and the nozzle openings be maintamed in properly spaced and centered relation with respect to each other.

It willnow be seen that in the operation of the range,'the flame jets of the several Bunsen burners are projected up through the secondary air nozzles into the combustion chamber and up against the under side ofthe forward portion of the cooking top, whlch is thus heated by'direct contact with the burner flames. However, the products of combustion in passing out through the rear portion of the combustion or heat generating chamber, areraused to give up their heat to the overlying or rear portion of the cooking top, which may thus be said to possess a secondary calorific surface available for slow cooking and warming up or keeping hot such food as may already have been cooked. The heating capacity of the escaping products of combustion is greatly increased by the shallow character of the heat generating chamber due to the close proximity of the burner plate to the cooking top, the products being caused to pass between the two without expansion in a stratum of substantially uniform character, which imparts practically the whole of its heat to the cooking top on the one hand and the burner plate on the other. The burner plate, becoming hot, will in turn radiate its heat to the overlying cooking top and aid further in promoting the heating efliciency of the range in this respect. Moreover, some of the heat radiated from the burner plate will be imparted to the air entering the underlying secondary air chamber and hence enable the air to be more effectively entrained at the flame ports. The effect above described will take place whether one or more of the burners are in operation at the same time, although necessarily the maximum heating effect will be obtained by the use of all the burners simultaneously. Once the cooking top is heated, one burner alone will keep it hot, since the combustion or heat generating chamber is substantially co-extensive with the top and allows the heated products of combustion to be distributed uni formly throughout the entire undersurface of the top. Again, the shallow character of the heat generating chamber becomes important in bringing about such uniform heating of the'top, the heated products ofv combustion being prevented from expanding unduly or in' a way which would dissipate the heat units. The unobstructed character of the heat generating chamber is important in bringing about the above results and it is also important in providing for the proper expansion of the burning gases within said chamber, such expansion avoiding back pressure upon. the flame ports or gas ori-- iices as well as the secondary air discharge openings and thus allowing both primary and secondary air to be properly supplied to and mixed with the gas in a manner conducive to the greatest heating efficiency.

As above stated, the secondary air nozzles constitute the sole means for admitting air into the combustion chamber, and this feature is not only useful in securing the advantages above noted, but also provides for the thorough aeration of the flame jet-s. In other words, the flame jets, when projected through the nozzle openings, automatically control the quantity of air admitted into the combustion chamber, entraining only so much air as is required to support combustion. The action is that of an ejector, the secondary air openings functioning as ejector throat openings and the flame ports as ejector nozzles, with the result that the secondary air-in beingv entrained by the flame jets is actually forced into the'heat generating chamber so as to ensure the proper aeration of the flame jets for complete combustion without rendering it necessary to resort to the use of a forced chimney draft with its attendant objections. The air thus entrained is in its pure atmospheric condition and is in no way contaminated by the products of combustion. The burners, being protected from the heat of the products of combustion, have less tendency to cause an excessive expansion of the contained gas'and hence the entraining of the primary air at lge gas cocksis kept substantially uniform a all times. It is also pointed out that due to the restricted character of the nozzle open ings, the pressure of the products of combustion at the burner orifices, notwithstanding the shallow character of the combustion chamber, is reduced to a minimum, thereby lessening the tendency to back pressure. These and other advantages will now be readily apparent to those skilled in the art.

While the best results may be obtained by the use of secondary air nozzles, arranged and functioning in the manner above described, some of the advantages might be derived by employing secondary air inlets of some other form. For instance, while the best results may be accomplished by providing a separate secondary air discharge opening for each of the flame ports, obviously substantially the same results may be obtained by making each secondary air d1scharge opening large enough to serve two or more flame ports, so long as the relation between the enlarged air opening and the associated flame ports is such as to produce the ejector effect previously noted. Similarly, the combustion or heat generating chamber might be constituted in some other way than by the use of the burner plateherein shown and described, so long as the chamber is enabled to function in the manner above pointed out. As to these matters, the scope of the invention is to be determined by the appended claims, which specifically set forth the novel arrangement or combination of parts.

The products of combustion in escapmg from the vents 9 pass into a flue or chimney supported upon the cooking top 3 behind the splasher 6. This .flue or chimney, in the preferred embodiment illustrated, is made up of two sheet metal sections and 51 (Figs. 8 and 9), having their opposite edges bent inwardly, as at 52, and then arranged in face to face contact to providereinforcing webs 53 connected together by seams.

The bending of the edges of the two sections 50 and 51 is carried out in such mannenas to provide within the flue end walls 54: WlllCll rise a short distance from the opposite sides of the closed top 3 and then curve upwardly and inwardly to a point near the top of the flue, where they extend vertically in parallel relation to form an exit 55 of restricted cross-sectional area (see particularly Figs. 3

and 8). The lower edges of the two sections 50 and 51 are bent inwardly to provide two parallel flanges 46 and 47 arranged at opposite sides of the vents 9 and serving to give direction to the products of combustion as they pass from the vent-s into the flue. Bracket plates 48 (Figs. 7 and 8) are also interposed between the front and back walls of the flue to brace them and hold them in properly spaced relation. As the flue is thus constructed, it is of substantially nozzle-like form, having a broad base extending en,- tirely across the cooking top from one end to the other so as to communicate with the underlying combustion chamber throughout its length. ,In this way, the products of combustion are drawn off from the combustion chamber in straight parallel lines, avoiding dead ends or pockets, which are so common in the use of a centrally located flue. Due to the curved end walls of the flue, the direction of flow of the products of .combustion will not be abruptly changed, but will be led toward the center without caus' ing undue disturbance in the flow, the action being somewhat in the nature of a venturi effect which induces a rapid evacuation of products along paths which conform generally to the natural paths of the heat currents. As a result, the drawing off of the products of combustion may be regulated to a nicety, the flue acting to ensure the proper ventilation of the combustion chamber, although without creating an excessive draught which would involve an unnecessary wastage of the heat units. Owing to the rapid evacuation .of the products, the flue exit may be of smaller cross-sectional area than would otherwise be the case, which is an added advantage. The location of the flue at the rear of the splasher 6 is also advantageous in that the whole surface of the cooking top in front of the splasher'is left entirely clear and unobstucted. By way of contrast, it may be stated that heretofore it has been the practice to locate the flue in front of the splasher, which arrangement materially limits the available cooking space of the top.

Fig. 9 shows a modified form of flue comprising front and back walls and 61 and straight upwardly and inwardly inclined end walls 62 and 63, the latter being constituted by separate plates held between the front and back walls. As thus constructed, the flue will function in somewhat the same manner as the flue above described, although to the precise construction shown and described, nor to any particular construction by which the same may be carried into effeet, as many changes may be made in the details without departing from the main principles of the invention and without sacrificing its chief advantages. It should be understood, therefore, that the invention is not limited to any specific form or embodiment, except in so far as such limitations are set forth in the appended claims. It should also be understood that while the several features set forth mutually cooperate in a peculiar way in attaining the general object sought, they or some of them might be used alone or in connection with other features as well. For instance, the improved flue arrangement could be applied to ranges of other kinds to very good 'advantage, and the same is true of the improved burner plate.

The terms front and rear, etc. used in the specification and claims .are employed in a relative sense only and are not intended to refer to any particular direction.

Having thus described my invention, its construction and mode of operation, what I claim and desire to secure by Letters Patent of the United States is:

1. A gas range including in combination, a closed cooking top, a burner plate supported below and in close spaced relation to the top and forming in connectiontherewith a shallow, unobstructed heatgenerating chamber substantially co-extensive with the top and having an outlet for the products of combustion, and a plurality of Bunsen burners, each formed with a series of flame ports, located at different isolated points below the burner plate and removable independently of said plate and of each other, the said burner plate being formed with a plurality of groups of secondary air discharge openings, one group for each burner, and the form and relation of the said air openings and the flame ports being such that the latter will act as ejector nozzles and the former as ejector throat openings when the range is in use; whereby the flame jets when projected through the burner plate openings will alone .automatically entrain whatever secondary air is required to support combustion under all effective conditions of use, thereby avoiding the necessity of a chimney draft, and supply the air to the bases of the flame jets; and whereby the burning gases-will be permitted to expand within the heat generating chamber without creating back pressure at the flame ports or the secondary air openings, and the products of combustion will be given a free and unimpeded flow in passing from the heat generating chamber.

2. A gas range including in combination, a closed cooking top, a burner plate supported below and in close spaced relation to the top and forming in connection therewith a shallow, unobstructed heat generating chamber substantially co-extensive with the top and having an outlet for the products of combustion, and a Bunsen burner located 7 below the burner plate and removable independently thereof said burner being formed with a series of flame ports and the burner plate with a cooperating series of secondary air discharge openings, the form and relation of these parts being such that the flame ports will act as ejector nozzles and the air openings as ejector throat openings when the range is in use; whereby the flame jets when projected through the burner plate so openings will alone automatically entrain whatever secondary air is required to support combustion under all effective conditions of use, thereby avoiding the necessity of a chimney draft, and supply the air to the bases of the flame jets; and whereby the burning gases will be permitted" to expand within the heat generating chamber without creating back pressure at the flame ports or the secondary air openings, and the products of combustion will be given a free and unimpeded flow in passing from the heat generating chamber.

3. A gas range including in combination,

a closed cooking top, a burner platearranged below and in close spaced relation tothe top and forming in connection therewith a shallow, unobstructed heat generating chamber substantially co-extensive with the top and closed at the front and sides 1 and open at the rear, an exterior flue communicating with the rear open end of the heat generating chamber, and a plurality of Bunsen burners, each formed with a series of flame ports, located in laterally 1 5 spaced relation beneath the'burner plate at the front of the range and removable independently of said plate and of each other, the said burner plate being formed above each of the burners with a group of secondaryv air discharge openings, the form and relation of said openings. and the flame ports being such that the latter will act as bases of the flame jets; and whereby the burning gases will be permitted to expand within the heat generating chamber without creating back pressure at the flame ports or the secondary air openings, and the products of combustion will be given a free and unimpeded flow rearwardly throughout the to the top and forming in connection therewfiatever secondary air is required to sup with a shallow, unobstructed heat generating chamber substantially co-extensive with the top and closed at the front and sides and open at the rear, an exterior flue communication with the rear open end of the heat generating chamber, and a Bunsent burner formed with a series of flame ports and located beneath the burner plate at the front of the range and removablle independently of said plate, the burner plate being formed above the burner with a group of secondary air discharge openings, and the form and relation of said openings and the flame ports being such that the latter will act as ejector nozzles and the former as ejector throat openings when the range is in use; whereby the burner plate openings constitute the sole means for admitting secondary air into the heat generating chamher; and whereby the flamejets in projectthrough said openings will alone entrain port combustion under' all efiective-conditions of use, without the necessity of a chimney draft, and supply the air to the bases of the flame jets; and whereby the burning gases will be permitted to expand within the heat generating chamber without creating back pressure at the flame ports or the secondary air openings, and the products of combustion will be given a free and unimpeded flow rearwardly throughout the extent of the heat generating chamber and effectively heat all portions of the cooking top at the rear of the burner in escaping to the flue. 1

5. A gas range including in combination, a closed cooking top, a substantially flat burner plate supported below and in close parallel relation to the top and forming in connection therewith a shallow, unobstructed heat generating chamber substantially co-extensive with the top, a take-0E flue communicating with the heat generating chamber, and a Bunsen burner located beneath the burner plate and formed with a series of flame ports constituting ejector nozzles, the said burner plate being formed above the burner with a series of corresponding individual secondary air openings located in the plane of the plate and through which the flame jets project.

6. A gas range including in combination, a closed cooking top, a burnerplate supported below and in close spaced relation to the top and forming in connection therewith a shallow, unobstructed heat generating chamber substantially co-extensive with the top, a take-off flue communicating with the heat generating chamber, a Bunsen'burner located beneath the burner plate and formed with a series of flame ports constituting ejector nozzles, the said burner plate being formed above the burner with a series of secondary air discharge openings acting as ejector throat openings for the ejector nozzles constituted by the flame ports, and the said flame ports terminating below the lower ends of the air openings, as and for the purpose described.

7. A gas range including, in combination, a closed cooking top provided with removable lids, a burner plate arranged below and in spaced relation to the top and having depressed portions located beneath the top lids, aseries of restricted secondary air discharge openings formed in the depressed portions of the burner plate with their upper ends flush with the bottoms of the depressed portions so as to drain ofl grease or other substances collecting therein, and a Bunsen burner located beneath the burner plate and arranged to project its flame jets upwardly through said openings.

8. A gas range including, in combination, a closed cooking top a burner plate arranged below and in spaced relation to the top, a burner located beneath the burner plate, and means for detachably suspending the burner from the burner plate, the said means including interlocking parts arranged partly on the burnerand partly on the burner plate and adapted to be engaged and disengaged by the bodily shifting of the burner in a plane parallel with the burner plate.-

9. A gas range including, in combination, a closed cooking top, a burner plate arranged below and in spaced relation to the top, said plate being formed with the narrow slot 42-, the rectangular opening 43, and the depressed shoulders 44, and a burner located beneath the burner plate and provided with the supporting lug 38 formed with the ear piece 39 to enter the slot and the wing portions 40 and 41 to seat on the depressed shoulder, said parts being constructed and arranged substantially as shown and describedu 10. A a closed cooking top, an underlying heat generating chamber having vents throughout its length, a Bunsen burner for said chamber and an upright narrow flue for drawing off the products of combustion from the heat generating chamber and having a wide base to communicate with all of said vents;

11. A gas range including, in combination,

a closed cooking top, an underlying heat generating chamber, a Bunsen burner therefor, and an upright narrow flue for drawing ofi the products of combustion from sald chamber, said flue having its base communieating with the heat generating chamber throughout the length of the same and presenting side and end walls, the latter being curved upwardly and inwardly from the base to a point near the top and then extending upwardly in parallel relation to said top, substantially as shown and described.

12. A gas range including, in combination, a closed cooking top, an underlying heat generating chamber having vents throughout its length, a Bunsen burner for said ch amber and an upright narrow nozzle-like fluehaving a base wide enough to cover all of said vents for drawing off the products of combustion from the heat generating chamber through said vents.

13. A gas range including, in combination, a closed cooking top, a burner plate arranged below and in close relation to the top and forming in connection therewith a closed shallow, unobstructed heat generating chamber extending beneath the cooking top for substantially its entire extent and open at the rear throughout its length for the dis? charge of the products of combustion, the said burner plate being formed with a group of secondary air ejector-throat openings extending therethrough, a Bunsen burner located beneath the burner plate and formed with a series of flame ports constituting ejecter nozzles disposed in cooperative relation to said openings, and an upright narrow flue for drawing off the products of combustion from said heat generating chamber, said flue having a Wide base co-extensive with the heat generating chamber and communicating therewith throughout the length of said chamber, and having side walls converging upwardly towards each other and terminating in a restricted discharge opening. 14. In a gas range, the combination of a closed cooking top, a burner plate arranged below and in spaced relation to the top, a burner located beneath the burner plate and provided with a mixing tube, 'a fixed gas nozzle extending into the mixing tube to support the burner at the front, the said mixing tube being adapted to be disengaged from the nozzle to permit the removal of the burner, by a bodily shifting of the burner in a fore-and-aft direction, and means for detachably supporting the opposite end of the burner from the burner plate, said means including interlocking parts on the burner and burner plate, respectively, adapted to be engaged and disengaged by said fore-and-aft bodily shifting of the burner.

In testimony whereof, I have affixed my signature hereto.

HENRY W. ODOWD.

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