US2748848A - Multi-flame gas burners - Google Patents

Description

June 5, 1956 J. H. FLYNN MULTI-FLAME CAS BURNERS 2 Sheets-Sheet 1 Filed Jan. 29, 1952 June 5, 1956 J. H. FLYNN MULTI-FLAME GAS BURNERS 2 Sheets-Sheet 2 Filed Jan. 29, 1952 United States Patent MULTI-FLAME GAS BURNERS John H. Flynn, New Rochelle, N. Y.

Application January 29, 1952, Serial No. 268,759

13 Claims. (Cl. 158 115) This invention relates to multi-fiame burners of the dual-pressure gas type, and more particularly to selfigniting burners of this type.

It is to this day the general practice to provide a separate pilot burner or burners alongside a multi-fiame utility burner or burners of this type for the ignition of the latter. This practice entails in all installations the costly provision and maintenance of a separate pilot burner or burners, and the latter also occupy in many industrial installations utility space which couldbe used to great advantage in bringing the multi-dame burner or burners into more effective heat-exchange'relation with work to be heated, or in simplifying conveyor equipment which carries the work to be heated past the multiflame burner or burners.

Accordingly, it is an object of the present invention to embody a pilot burner or burners directly in a multiflame burner of this type, thereby to eliminate the extra cost involved in the provision and maintenance of a separate pilot burner or burners, and also to obviate all practical inconveniences or diiiicuities heretofore encountered in the provision of a separate pilot burner or burners in many industrial installations.

It is another object of the present invention to have provisions in the gas-distributing casing or manifold of a dual-pressure gas burner of this type for the selective installation of a pilot burner tip or of a utility burner tip among the installed utility burner tips for the selective use of the multi-fiame burner with or without. a pilot burner.

A further object of the present invention is to have provisions in the gas-distributing casing' of a. burner of this type for the selective installation of a plurality of pilot burner tips or of utility burner tips at spaced places among the installed utility burner tips for the selective use of the multi-name burner with one or more pilot burners.

Another object of the present invention is to provide for the selective use in a burner of this type a pilot burner tip which consists of a utility burner tip identical with the other utility burner tips, and an exceedingly simple adapter which may readily and instantly be assembled with the utility burner tip into a pilot burner tip, or disassembled from the burner tip for further use of the latter as a utility burner tip.

It is another object of the present invention to have identical provisions in the gas-distributing casing of a burner of this type for the correct reception of utility burner tips only, even at the place or places Where a pilot burner tip or tips may be installed, and to have further provisions in the casing at the place or places designated for a pilot burner or burners for the selective reception thereat of the aforementioned adapter or adapters for pilot burner use, or of a plug-like fitting or fittings to permit the use of a utility burner tip or tips as such at the place or places designated for the selective use of a pilot burner tip or tips.

It is a further object of the present invention to have ice provisions in a multi-fiame burner of this type for the assured and rapid propagation of a momentary ignition flame or of a steady pilot iiame to all burner tips of the burner the instant they are supplied with gas.

Another object of the present invention is to provide on the outside of the gas-distributing casing of a burner of this type and between the burner tips thereof restricted channels to compel and accumulate therein highly flammable gas from the adjacent burner tips as' soon as the latter are supplied with gas, thereby to assure rapid propagation of a ame from one burner tip to all the remaining burner tips.

A further object of the present invention is to extend these fiame-propagation channels to the pilot burner tip or tips of the aforementioned combined utility and pilot burner of this type.

lIt is still another object of the present invention to cover the aforementioned fiamepropagation channels throughout their lengths not only to protect thein from dirt and other foreign matter, such as brushedol`f excess solder in the manufacture of can bodies, for instance, but also to provide for further and quicker accumulation of gas in these channels and accordingly accelerated and unfailing propagation of a iiame from one burner tip to all the remaining burner tips.

Further objects and advantages will appear to those skilled in the art from the following, considered in conjunction with the accompanying drawings.

In the accompanying drawings, in which certain modes of carrying out the present invention are shown for illustrative purposes:

Fig. 1 is a front viewy of a burner embodying the present invention;

Fig. 2 is an enlarged end view of the same burner as viewed in the direction of the arrow 2 in Fig. 1;

Figs. 3, 4 and 5 arey enlarged cross-sections through the burner as taken on the lines 3 3, 4 4 and 5 5, respectively, of Fig. 1;

Fig. 6 is an enlargedl fragmentary section taken on the line 6 6 of Fig. 4;

Fig. 7 is a fragmentary front View of a modified burner;

Fig. 8 is an enlarged end-view, partly in section, of the modified burner of Fig. 7, the section being taken on the line 8 8 of Fig. 7;

Fig. 9 is a fragmentary front view of another modified burner;

Fig. 10 is an enlarged end view, partly inV section, of the modified burner of Fig. 9, the section being taken on the line 10 10 of Fig. 9; and

Fig. 1l is an enlarged end View, partly in section, of still another modified burner.

Referring to the drawings, and more particularly to Figs. 1 to 5 thereof, the reference numeral 2@ designates a dual-pressure gas burner which comprises a burner casing or manifold 22 and a plurality of burner tips 24. The casing 22, which may conveniently be cast, has bottom, front, top, rear and end walls 26, 28, 3d), 32 and 34, respectively, and an internal partition Wall 36 which divides the casing into a high-pressure gas chamber 38 and a low-pressure gas chamber 4th. The casing 22, which may be provided with suitable mounting pads 42, has also a boss 44 which is internally threaded at 46 for the reception of a conduit 48 that is in communication with a gas main or any other suitable supply of flammable gas under pressure. As shown in Fig. 4, the conduit 48 is in direct communication with the high-pressure chamber 38, and gas from the latter is admitted into the lowpressure chamber 40 through a valve opening St) in the internal partition wall 36. Cooperating with a seat portion 52 of the valve opening 50 is the beveled end 54 of a valve screw 58 which is threadedly received in the rear wall 32 of the burner casing and locked in axially adjusted position by nuts 60. While the beveled end 54 of the valve screw 58 is in normal use of the instant burner spaced from the seat 52 so as to admit gas from the highpressure chamber 38 into the low-pressure chamber 40, the valve screw 58 may, if desired for any purpose, be brought into engagement with the seat 52 of the valve opening 50 so as to prevent gas from the high-pressure chamber 38 from entering the low-pressure chamber 40.

The top wall 30 of the burner casing 22 is, in the present instance, smoothly rounded at the front, and is there provided with a plurality of identical parallel bores 62 which are preferably inclined as shown in Figs. 3 to 5. The bores 62, which in this instance are arranged in line, are adapted for the fitted reception of the heads 64 of the dual-pressure gas burner tips 24, respectively. Provided in the partition wall 36 of the burner casing 22 in axial alignment with the bores 62, except the bores 62a and 62b thereof (Fig. l), are bores,68 (Fig. 4) which are preferably tapped for the removable reception of the threaded Shanks 70 of burner tips 24, respectively. Bores 62 and 68 thus provide an axially aligned set of holes for reception of a burner tip in the casing. Each of the burner tips 24 has an intermediate body portion 72 seated in an annular recess 74 in the partition wall 36, and is also provided with a longitudinal through-passage 76 leading to the iame end 77 of the burner tip. Each burner tip 24 of the instant dual-pressure gas type is further provided in its head 64 with toothlike forma tions 80 to define in the respective bore 62 aplurality of secondary or low-pressure gas passages.

For operating the instant burner, the valve-screw 58 is so adjusted that the gas admitted into the low-pressure chamber 40 has sufficient pressure to sustain the secondary ames f' at the flame end 77 of each burner tip 24 to an extent like or similar to that indicated in dot-anddash lines in Fig. 4, while the pressure of the gas in the high-pressure chamber 38 is regulated, by a suitable valve in the conduit 48, for instance, so that a sharp and steady jet ame f of the desired length is emitted from the flame end 77 of each burner tip 24. Thesecondary flames f from each burner tip 24 serve the well-known purpose of sustaining the associated jet flame f.

The burner is, in the present instance, also provided with a built-in pilot burner unit 90 (Fig. 3) so as to render the burner selfigniting. In this instance also, the burner casing 20 has provisions at more than one place thereof for the selective reception of either a pilot burner unit 90 or a dual-pressure gas burner tip 24, thereby affording the opporunity to provide the burner with more than one pilot burner unit at different places thereof, or to provide the same with a single pilot burner unit at either one of these places. Further in accordance with the present invention, each pilot burner unit 90 comprises a dual-pressure gas burner tip 24 and a structurally simple adapter 92.

For the selective reception of a pilot burner unit or units 90, the bottom wall 26 and partition wall 36 of the casing 22 are provided with sets of bores 94 and 96, respectively, of which the bores of said sets are axially aligned with the bores 62a and 62b, respectively (Figs. 1, 3 and 5). The bores 94 in the bottom Wall 26 of the burner casing extend, in the present instance, through inclined bosses 98 and 100, respectively, on the casing, and are tapped for the removable mounting of an adapter 92.

The adapter 92 is cylindrical and has a threaded portion 99 for its removable mounting in either one of the tapped bores 94 in the casing. To facilitate the mounting of the adapter 92 in, or its removal from, the burner casing 22, the same is provided in this instance with a hexagonal head 101. An inner end length of the bores 62a and 62b is counter-bored at 102 and 104, respectively, to the same diameter as the aligned bore 96 in the partition wall 36. The non-threaded length of the adapter 92 is of the same diameter as either one of the bores 96 in the partition wall 36 of the burner casing, so that the mounted adapter in either one of the bores 94 effectively seals thereat the chambers 38 and 40 from each other and from the outside of the burner casing (Fig. 3). The adapter 92 is provided with a gas passage 110 which leads into a tapped socket portion 112 for the reception of the threaded shank 70 of a utility or dual-pressure gas burner tip 24. The outer end of the gas passage 110 in the adapter 92 is tapped for the reception of a conduit 114 which is in communication with any supply of flammable gas suitable for pilot burner purposes. The body portion 72 and part of the head 64 of the burner tip 24 is received in an enlarged end bore 116 in the adapter 92, and the remaining part of the head 64 of the installed burner tip is, in the example shown in Fig. 3, ttedly received in the bore 62a. When the pilot burner unit is installed as shown in Fig. 3, the body portion 72 of the burner tip 24 thereof is seated on an annular shoulder 118 in the adapter 92 so that only the longitudinal through-passage 76 in the burner tip 24 is in communication with the gas passage in the adapter 92 for sustaining a pilot flame f at the flame end 77 of the tip (Fig. 3).

As previously mentioned, either one pilot burner unit 90 may be mounted in either one of the bores 94 in the burner casing 22, or a pilot burner unit may be mounted in each of the bores 94 in the burner casing. In either case, the llame end of a pilot burner unit is in igniting proximity to the flame ends of the next adjacent utility burner tips 24, so that the latter will be lighted as soon as the gas to the burner casing 22 is turned on, and the arne from the thus ignited utility burner tips 24 will soon propagate to the remaining utility burner tips.

In accordance with `a further aspect of the present invention, provisions are also made to permit the normal use of a dua1pressure gas burner tip 24 at one of the bores 62a or 62b in the burner casing if only one pilot burner unit 90 is used at the other one of these bores. Thus, assuming that only one pilot burner unit 90 is used in the present burner, and that the same is installed at the bore 62a in the burner casing (Figs. l and 3), recourse is had to a plug-type adapter 120 (Fig. 5) to permit the normal use of a dual-pressure gas burner tip 24 at the bore 62b. The adapter 120 has a threaded plug end 122 and a sleeve-like extension 124, of which the former is in this instance received in that tapped bore 94 in the burner casing which is in axial alignment with the'bore 62b therein, while the cylindrical sleeve exten- 'sion 124 is ttedly received in the aligned bore 96 in the partition wall 36 to seal the high-pressure chamber 38 from the low-pressure chamber 40. The adapter 120 is preferably provided with a hexagonal head 126 for its ready mounting in, or removal from, the easing 22. The sleeve extension 124 of the adapter 120 has an internal passage 128 which leads to a tapped socket portion 130 for the reception of the threaded shank 70 of a dualpressure gas burner tip 24. The sleeve extension 124 of the adapter 120 is further provided in its peripheral wall with one or more inlet duets 132 to provide communication between its passage 128 and the high-pressure chamber 38 of the casing. The sleeve extension 124 of the adapter 120 is of such longitudinal dimension that the burner tip 24 installed therein assumes the same position in the bore 62b (Fig. 5) as do all the other burner tips 24 in their respective bores 62 (Fig. 4). The burner tip 24 at the bore 62b, assembled with the adapter 120 as described and mounted as shown in Fig. 5, performs like any of the other burner tips 24, with the exception of the burner tip used in conjunction with the adapter 92 of the pilot burner unit 90. Thus, the through-passage 76 in the burner tip 24 at the bore 62b is in communication with the high-pressure chamber 38 of the burner casing 22 via the ducts 132 and passage 128 in the adapter 120, while the secondary gas passages 82 along the head 64 of this burner tip are in communication with the low-pressure chamber 40.

The bores 62 in the burner casing 22 are so spaced from each other, 'and the flame ends 77 of the installed utility burner tips 24 are so exposed to the outside of the casing 22, that the flame ends 77 of these burner tips, including that of the burner tip of the pilot burner unit 90, are in igniting proximity to each other. cordingly, with the pilot burner lighted, all the other burner tips 24 will be lighted on admitting gas into the chambers 38 and 40 in the casing.

Reference is now had to Figs. 7 and 8, which show another feature of the present invention. Thus, the burner casing 22 may on its outside be provided with widthwise restricted grooves or channels 140 which lengthwise extend between successive bores 62, respectively, and serve for quick llame propagation from one burner tip to the others. On admission of gas into the casing 22 and according escape of gas from the burner tips 24, some gas will immediately accumulate in the channels 140, and the gas thus accumulated therein will quickly ignite and the flame thereof propagate to all lburner tips if one of these burner tips is lighted. This particular feature of the present invention is advantageous regardless of whether the burner is or is not provided with a pilot burner unit. Thus, if the burner is provided with a pilot burner unit or units, the llame or iiames thereof will immediately propagate to all remaining burner tips on admission of gas into the casing 22. However, if the present burner should not be provided with a pilot burner unit, the flame from any one of the utility burner tips 24, ignited in any manner whatsoever, will propagate to the remaining burner tips and ignite the same just as rapidly as if the burner were provided with one or more pilot llames. Further, the instant flame-propagation channels in the burner casing 22 are fully as advantageous if the utility burner tips should be single-pressure gas burner tips used for many purposes other than the ones for which the instant dual-pressure gas burner tips are especially applicable.

For more rapid accumulation of gas in the channels 140 in the burner casing 22 and accordingly accelerated flame propagation to the various burner tips, the channels 140 may be covered, except at their ends, as shown in Fig. 10. In the present instance, the flame-propagation channels 146 are covered by a shield block 142 which is suitably mounted `at 144 on the outside of the burner casing 22, and provided with llame openings 146 which are in axial `alignment with the mounted burner tips 24, respectively (see also Fig. 9). The burner tips 24 are thus effectively protected from dirt and other foreign matter, such as wiped-off solder in the manufacture of can bodies, for instance. The shield block 142 may, if desired, be provided with a multiplicity of cooling ribs 148.

Reference is now had to Fig. l1 which shows a modied arrangement of the name-propagation channels or grooves. In this instance, no flame-propagation channels are provided in the burner casing 22, and they are instead provided at 140' in the shield block 142 between successive flame openings 146 therein, respectively.

The invention may be carried out in other speciic ways than those herein set forth Without departing from the spirit and essential characteristics of the invention, and the present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming Within the meaning and equivalency range of the `appended claims are intended to be embraced therein.

I claim:

l. A dual-pressure gas burner, comprising a casing having separate chambers for high-pressure Iand lowpressure gas, respectively; a row of upwardly inclined dual-pressure gas burner tips in said casing, each of said burner tips having a flame end exposed to the outside of saidcasing in substantial igniting proximity to the ame ends of the next adjacent burner tips, and separate gas passages leading to said flame end and communicating with said chambers, respectively; and a shield block mounted on the outside of said casing and having flame openings in line with said burner tips, respectively, said shield block having adjacent said casing widthwise restricted grooves longitudinally extending between adjacent flame openings, respectively, 'and serving for quick arne propagation to `all burner tips.

2. A dual-pressure gas burner, comprising a casing having an outer wall and separate chambers for highpressure and low-pressure gas, respectively; a row of upwardly inclined dual-pressure gas burner tips in said casing, each of said burner tips having a ame end exposed to the outside of said casing in substantial igniting proximity to the flame ends of the next adjacent burner tips, and separate gas passages leading to said flame end and communicating with said chambers, respectively; and a shield block mounted on the outside of said casing and having flame openings in line with said burner tips, respectively, said outer casing wall being provided with gro-oves of restricted widths longitudinally extending between the iiame ends of adjacent burner tips, respectively, and serving for quick llame propagation to all burner tips, and said grooves being covered, except at their ends, by said shield block for greater accumulation of gas therein and accordingly accelerated flame propagation to all burner tips.

3. A self-igniting dual-pressure gas burner, comprising a casing having separate chambers for high-pressure and low-pressure gas, respectively; a row of upwardly inclined dual-pressure gas burner tips in said casing, each of said burner tips having a flame end exposed to the outside of said casing in substantial igniting proximity to the ame ends of the next adjacent burner tips, and separate gas passages leading to said ame end and cornmunicating with said chambers, respectively; a pilot burner tip in said casing, said pilot burner tip having a flame end exposed to the outside of said casing in substantial igniting proximity to the flame end of an adjacent dual-pressure gas burner tip, and a gas passage out of communication with said chambers; and a shield block mounted on the outside of said casing and having flame openings in line with said burner tips, respectively, said shield block having adjacent said casing widthwise restricted grooves longitudinally extending between adjacent iiame openings, respectively, and serving for quick flame propagation to all dual-pressure gas burner tips.

4. A self-igniting dual-pressure gas burner, comprising a casing having an outer wall and separate chambers for high-pressure'and low-pressure gas, respectively; a row of upwardly inclined dual-pressure gas burner tips in said casing, each of said burner tips having a flame end exposed to the outside of said casing in substantial igniting proximity to the flame ends of the next adjacent burner tips, and separate gas passages leading to said iiame end and communicating with said chambers, respectively; a pilot burner tip in said casing, said pilot burner tip having a ame end exposed to the outside of said casing in substantial igniting proximity to the iiame end of an adjacent dual-pressure gas burner tip, and a gas passage out of communication with said chambers; and a shield block mounted on the outside of said casing and having ame openings in line with said burner tips, respectively, said outer casing wall being provided with grooves of restricted widths longitudinally extending between the ame ends of adjacent burner tips, respectively, and serving for quick flame propagation to all dual-pressure gas burner tips, and said grooves being covered, except at their ends, by said shield block for greater accumulation of gas therein and accordingly accelerated flame propagation to all dual-pressure gas burner tips.

5. A self-igniting dual-pressure gas burner, comprising a casing having an outer wall and an internal partition wall dividing said casing into first and second chambers for high-pressure and low-pressure gas, respectively, said casing also having substantially parallel first and second sets of axially aligned holes of which those of said first set extend through the outer wall of said second chamber and through said partition wall, respectively, and the holes of said second set are of larger cross-sectional dimensions than those of said first set and extend through said partition wall and through the outer walls of said chambers, respectively; a first utility burner tip received with its outer flame end and with its inner end in the holes of said first set in the outer wall of said second chamber and in said partition wall, respectively, and having separate first and second gas passages leading to said flame end and communicating with said first and second chambers, respectively; another utility burner tip identical with said first burner tip; and a sleeve-type adapter extending through said chambers and holes of said second set and removably mounted in the latter in closing relation therewith, and having a gas passage out of communication with said chambers, said adapter internally removably receiving said other burner tip with said first and second gas passages thereof in and out of communication, respectively, with said adapter gas passage and with its tiame end exposed to the outside of said casing in igniting proximity to the flame end of said first burner tip, wherefore said other utility burner tip serves as a single gas pressure type pilot burner tip.

6. A dual-pressure gas burner as set forth in claim 5, in which an outer length of the hole of said second set through the outer wall of said second chamber is reduced to the same cross-sectional shape and dimension as the hole of said first set through the same outer wall of said second chamber and fittedly receives the tiame end of said other burner tip, and said adapter is fittedly received in the cross-sectionally non-reduced remainder ot the hole having said reduced length.

7. A dual-pressure gas burner, comprising a casing having an outer Wall and an internal partition Wall dividing said casing into first and second chambers for highpressure and low-pressure gas, respectively, said casing having axially aligned holes in said partition wall and the outer walls of said chambers, respectively; a plug-type adapter extending through said first chamber and mounted in said hole in the outer wall of said first chamber in closing relation therewith, said adapter being provided with a sleeve extension iittedly received in said hole in said partition wall and having an aperture providing communication between said iirst chamber and the interior of said sleeve extension; and a burner tip received with its inner end in said sleeve extension, said burner tip having an opposite flame end fittedly received in said hole in the outer wall of said second chamber, and separate gas passages leading to said liame end and communicating with the interior of said sleeve extension and said second chamber, respectively.

S. A dual-pressure gas burner as set forth in claim 7, in which said plug-type adapter is threadedly received in said hole in the eater wall of said first chamber, and the inner end of said burner tip is threadedly received in said sleeve extension, so that said adapter and burner tip may bc removed from said casing and from each other.

9. A gas burner, comprising a gas-distributing casing having an outer wall; holes through said outer wall and burner tips disposed therein each having a flame end exposed at said outer wall to the outside of the casing, said outer casing wall being provided with a groove of restricted cross-sectional arca longitudinally extending between the flame ends of said tips; and a cover over said groove to define with the latter a conduit open at its opposite ends, said conduit ends terminating substantially at the points of their intersection with adjacent burner tip holes in said casing.

lti

10. A self-igniting dual-pressure gas burner, comprising acasing having wall means defining separate first and second chambers for high-pressure and low-pressure gas, respectively, said wall means including a partition wall between the chambers and having formed therein a first set of axially aligned holes, one of the holes of said set extending through said partition wall and another through an exterior wall of said casing, whereby said holes provide communication between said chambers and between one of them and the outside of said casing; said wall means also having formed therein a second set of axially aligned holes adjacent said first set and parallel thereto, the holes of said second set extending through said partition wall and through oppositely disposed exterior walls of said chambers to provide communication between said chambers and between each of them and the exterior of the easing; a first utility burner tip mounted in said first set of holes, said burner tip having a tiame end disposed in the hole opening on the exterior of said casing and separate first and second gas passages leading to said flame end and communicating with said first and second chambers, respectively; another utility burner tip identical with said first tip and mounted in said second set of holes; and a sleeve-type adapter extending in said second set of holes through said chambers, said adapter being snugly received by the peripheries of said holes in gastight engagement therewith, said adapter internally receiving said other burner tip with the flame end thereof exposed to the outside of said casing in igniting proximity to the flame end of said first burner tip, said adapter having a gas passage out of communication with said chambers and in and out of communication with said first and second gas passages, respectively, of said other burner tip, wherefore said other utility burner tip serves as a single gas pressure type pilot burner tip.

1l. A self-igniting dual-pressure gas burner as set forth in claim l0, in which said adapter is removably mounted in said second set of holes, and said other burner tip is removably received by said adapter, so that said other burner tip and adapter may be removed from each other and from said casing.

l2. A self-igniting dual-pressure gas burner comprising a casing having wall means defining separate highpressure and low-pressure gas chambers, said wall means including a partition wall between the chambers and having formed therein a plurality of sets of holes, the holes of each set being axially aligned, one hole of each set extending through said partition wall and another through an exterior wall of said low-pressure chamber, said sets lof holes being spaced along the burner and providing communication between the chambers and between the low-pressure chamber and the exterior ot said casing; at least two of said sets of holes comprising pilot burner sets and said wall means having at each of these locations a hole through an exterior wall of said high-pressure chamber in axial alignment with the other holes in the respective sets, whereby said two sets of pilot burner holes provide communication between said chambers and between 'each of them and the exterior of said casing, said pilot burner holes being separated by a plurality of the other sets of holes in said casing; a burner tip mounted in each set of holes, each tip being identical in construction with the others and each having a flame end exposed to the voutside of said casing in igniting proximity to the flame ends of the next adjacent burner tips, and separate first and second gas passages leading to said flame end and, 'except for the tips in said pilot burner holes, communicating with said high and low pressure chambers, respectively; a sleeve-type adapter extending through both said chambers and mounted in the holes of one of said sets of pilot burner holes in closing relation therewith, said said tip communicates with said adapter gas passage, whereby said one burner tip serves as a self-contained single-pressure gas pilot burner tip; and another plug-like adapter removably mounted in, and in gas-tight engagement with, the holes in said high-pressure chamber and partition wall of the other set of pilot burner holes, said plug-li e adapter having a socket for the removable reception of the burner tip therein, whereby the second gas passage of said last said burner tipv communicates with said low-pressure chamber while said rst gas passage thereof communicates with said socket, and said plug-like adapter has an aperture formed through its wall to provide communication between its socket and said highpressure chamber.

13. A gas burner, comprising an enclosed gas-distributing casing having an outer wall part; holes through said outer wall part; burner tips disposed in each having a llame end exposed at said outer wall part to the outside of said casing; a cover part on said wall part having flame apertures spaced to coincide with said holes in said outer wall part; one of said parts being provided with a laterally open narrow groove of restricted cross-sectional area extending longitudinally of said casing between adjacent burner tips; said parts defining between them covered flame propagating conduit means open only at the intersection of said conduit means with said burner tip holes.

References Cited in the le of this patent UNITED STATES PATENTS 791,923 Machlet June 6, 1905 1,151,327 Andreas Aug. 24, 1915 1,204,359 Kemp et al Nov. 7, 1916 2,038,749 Martn Apr. 28, 1936 2,059,360 Keith Nov. 3, 1936 2,533,143 Scharbau et al. Dec. 5, 1950 2,547,276 Marsh et al Apr. 3, 1951 2,596,229 Flynn May 13, 1952 2,599,457 Jones June 3, 1952 2,633,190 Kerwin et al. Mar. 31, 1953 2,648,377 Bodey Aug. 11, 1953 FOREIGN PATENTS 51,010 Denmark Dec. 9, 1935

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