US2805710A

US2805710A - Gas burner

Info

Publication number: US2805710A
Application number: US215220A
Authority: US
Inventors: Brumbaugh Isaac Vernon
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-03-13
Filing date: 1951-03-13
Publication date: 1957-09-10
Anticipated expiration: 1974-09-10

Description

' Sept. 10, 1957 l. v. BRUMBAUGH GAS BURNER 2 Sheets-Sheet 1 Filed March 15, 195] IZI INVENTOR.

m W A W B MM .lhV: Bj

ATTORNEY Sept. 10, 1957 l. v. BRUMBAUGH GAS BURNER 2 Sheets-Sheet 2 Filed March 13, 195] FIG.6

FIG.5

W02 0 ATTORNEY United States Patent Patented Sept. 10, 1957 GAS BURNER Isaac Vernon Brurnbaugh, Clayton, Mo.

Application March 13, 1951, Serial No. 215,220 7 12 Claims. (Cl. 158-116) This application is in part a continuation of my copending application Serial No. 745,138, filed May 1, 1947, now Patent No. 2,609,871 the burners shown herein being adaptations and improvements on the burner construction described therein and employing separators in similar fashion.

The inventions disclosed in this application relate to burners for gas cooking stoves both domestic and commercial and especially to burners of the type useful as top burners and commonly called cooking top burners. However, my improved burners can be used also in other heating apparatus such as water heaters, coffee urns, etc. Heretofore cooking top burners have usually been manufactured in three separate different designs for three difierent types of gas. Usually there has been manufactured a burner with small size ports and with a small total port area which is used for manufactured gases. Second, there has also been usually manufactured a cooking top burner with medium size ports and with a medium total port area for use with petroleum gases such as butane and propane, with butane-air, with propane-air and with the mixed gases but these medium size burners have not been very good for use with propane air and butane-air. Third, there has also been usually manufactured burners with large size ports with a large total port area for the natural gases.

It is highly desirable to design cooking top burners which are useful with all types of gases. However, if a burner is manufactured which has a relatively small total port area, it is subject to disadvantages such as a tendency to deposit soot which is often indicated by yellow tips of the flame or by a tendency for a lifting or blowing away of the flames. Therefore, a relatively large total port area is necessary especially where the burner is used with natural gases and propane-air and butane-air gases. The total port area in such cases should be at least about 2 /2 times the throat area of the burner. If large size ports are provided in order to secure large total area, such burners have a tendency to flash back and to cause an after pop as the flame is turned out, especially where the burner is used with manufactured gases and propane-air and butane-air gases. Especially in such cases, the diameter of any single drilled port should be preferably about 0.07". The diameter of such drilled ports should at all events be less than 0.1 and should be greater thant 0.05". Thus the reconciliation of these two opposing factors was one of the problems which I sought to solve in making the inventions here disclosed.

In some burners heretofore designed there have been produced a continuous flame, which is designated as a ribbon flame as distinguished from a series of separate flames which are not continuous through their length but are substantially contiguous adjacent to their base. A ribbon flame does not aerate well and heats the burner excessively because of the inability to convey heat away by conduction.

One of the objects of my invention, therefore, is the provision of a cooking top burner which is universal and adaptable for use with all types of gases.

A further object of my invention is the provision of such a burner which regardless of the type of gas used is not subject to the disadvantages of flash back and after pop on the one hand or the depositing of soot with yellow tips and the lifting or blowing of the flames from the ports on the other hand.

A further object of my invention is a provision of a burner which is economical to manufacture by reason of the fact it is manufactured of a relatively small number of parts.

A further object of my invention is the provision of a cooking top burner which has a satisfactory flame pattern consisting of a series of flames as distinguished from a ribbon flame.

A further object of my invention is the provision in such a burner of a cluster of center ports which provision overcomes the disadvantage of having a single or even a pair of center ports, such construction characterizing ports of burners which are difficult to light at times and which are likely to go out when the flame is turned low.

Further objects and features of my invention will be apparent from the following specification and claims when considered in connection with the accompanying drawings illustrating several embodiments of my invention.

In the drawings:

Fig. l is a view in top plan of a burner constructed according to my invention showing flames issuing from two pairs of the ports and having parts broken 'away because of space requirements and to show the internal construction more clearly;

Fig. 2 is a view mainly in vertical section of the burner shown in Fig. l but having a small portion broken away and showing a flame issuing from each of two pairs of ports;

Fig. 3 is a fragmentary view in elevation of a portion of the burner illustrated in Figs. 1 and 2;

Fig. 4 is a view in top plan showing a modification, having however portions broken away to disclose more clearly the internal construction;

Fig. 5 is a view partly in elevation and partly in vertical section showing more completely the structure shown in Fig. 4; and

Fig. 6 is a fragmentary View in elevation of a portion of the burner shown in Figs. 4 and 5.

Following are some of the known facts which I have heretofore proved and some of the considerations which induced my development of the burners here disclosed.

As heretofore stated, there must be at least a certain minimum of total port area in order to insure proper combustion and prevent lifting and blowing away of flames. Therefore, a good burner has suflicient total port area. A good burner will also not flash back when consuming either the manufactured gases or any other gases. This means that the individual ports cannot be relatively large. I find that for cooking top burners, ports that are drilled should be not larger than about a No. 49 drill size (.073 inches diameter) when the wall thickness is about one quarter inch. Also, an oblong port should not be wider than about .060 inches, when the wall thickness is about a quarter inch. The above dimensions are used in the construction of the burners illustrated and described herein.

With relatively large ports, gas flames will light back through the ports and burn within the burner. This is called flash back. It usually occurs only when the burner is turned fairly low, such as that approachinga simmer flame. It may occur when lighting the burner if the ports are too large in diameter or width. Small ports (small width or small diameter) are necessary to prevent such iflash back or an after pop. Lifting and blowing of the flames from the ports occurs when the burner is turned on full. The flames ofslow burning gases such as the natural gases lift or blow away from the ports with burners not having enough total port area. Also, with small total port area, the flames of la butane-air and propaneair will not, only lift or blow away, but there is also yellow (i. e. yellow tips) in the flames which means a carbon or soot deposit therefrom.

Gas burners may be said to consist of a mixing tube and a burner head. The American :Gas Association de fines the Burner Head as that portion of a burner, beyond the outlet end of the mixer tube, which contains the ports. p

I repeat that to make good burnersthat burn properly with the natural gases and the butane-air and the pro; paneaair gases (that. is to say, burn without the flame lifting or blowing away from the. ports when the gas is fully turned' on), a relatively largenumber of portsor a relatively large total port area must be provided. With the narrow oblong ports which I use and with the No. 49 drill ports, there is no after pop when the gas is turned off. Such an after pop is annoying to some people and is most pronounced with the manufactured gases, butane-air and propane-air with inferior burners. Relatively small ports are necessary to prevent after pop or flashback. I

The objectionableflyellow tips" are usually encountered with propane and butane. Yellow tips are objectionable because the flame will carry soot to be deposited on the bottom of utensils being used. When the total port area is relatively large as in the burners described and disclosed herein, enough air is injected into the burner with the gas that there is no yellow in the flames. When a burner has enough total port area to prevent lifting and blowing away of flames and the ports are made small enough so that flash back and after pop does not occur, the yellow tip problem is automatically solved, Enough port, area with ports the proper dimensions and the ports properly located (i. e. spaced and grouped) and arranged are really the secrets that I have discovered which are back of designing a burner that can be used for all of the various fuel gasesr Aeration of flames is also very important because the burners have, to pass combustion tests and efficiency tests of the American Gas Association Testing Laboratories. My burners. are therefore also, designed so as to produce a series of flames, not a continuous or sorcfllled ribbon flame. A ribbon flame does not aerate as effectively as a series of flames. With my burners the. flame are contiguous to one another soas to accomplish instant spreading of the flames. from one of the peripheral ports, to the other, yet the spacing is such as, to provide for the access of the secondary air between the flames. This is conducive to proper combustion of the gas and to the spacing of the burners close to the utensil for good efiiciency.

I have provided clusters of center ports which are essential for good performance. Single center ports. or pairs of center ports will not light consistently even when there is a. utensil above the, burner. Single center ports or pairs of ports will not stay lighted when. the gas is turned down to a good simmer setting. When the center ports do not burn, it releases gas which is unpleasant and dangerous to health, so I hav grouped my center ports. I prefer at least four ports in a. group which ports should be spaced as close together as practical. I may use four, five or six center ports in groups. and also use from two, three or four groups of ports to accomplish the proper distribution over the bottom of the utensil. These center ports when drilled are made, in the embodiments shown, with a drill of about No. 49- drill size (.073 inch diameter). The width of the elongated peripheral slots should be about 0.06". It should be between 0.05 and 0.10.

tion 121 by means of a bolt 128.

It will be noticed that my burners consist of a member having a burner head portion and a mixing tube portion, a burner cap member (one or both members being formed with teeth or ribs) and a spacer between the members. So made, it is not very costly to manufacture. I prefer, especially for the peripheral ports, the flame pattern consisting of a series of separated flames extending around the periphery of the burner as shown in Fig. 1. However, I prefer that the gas from the ports above and below each other merge together and form a single flame, as shown in Figs. 1 and 2. When there is a thin wall of, for example, less than 0.06 and preferably having a thickness of about 0.012 between the upper and lower ports, the gas issuing from each of the ports forms a common single flame with one inner cone as shown in Figs. 1 and 2 of the drawings. The peripheral flames, however, should be separated at their tips and throughout most of their lengths in order to insure proper aeration but should be contiguous at their bases in order that the flame may spread readily. Thus there should be a greater space (e. g. about .08") between each pair of ports (consisting of an upper and lower port) and the next adjacent pair (consisting also of an upper and lower port). As stated above, however, the distance between the two portsof the pair should be less than 0.06". This minimum distance between ports of a cluster applies as well to the center top ports as to the peripheral ports.

These peripheral ports as formed in my burners are free from clogging. Boils, overdrips, etc. do not fall into the ports. By my construction of providing lugs or teeth on one or both of the cooperating mixing tube member and burner cap membenl insure adequate port area with contiguous separated flames and at the same time provide the minimum width of the ports essential to the prevention of flash back and after pop. It is clear that by means of my economical spacer construction I assure doublethe port area while maintaining the vertical width of the ports at the necessary minimum.

Referring especially for a detailed description to Figs. 1-3, inclusive, of the drawings, it may be seenthat I have shown therein, a cooking top burner generally designatedv of which there is a burner head portion 121, and a mixing tube portion 122. The burner head portion has an upper member or burner cap 123. Associated with burner 120 is a nozzle extension 124 of a burner control valve and an orifice cap 125 provided therefore. The burner 120 is provided with an air adjusting plate. 126 held in adjusting position by a screw 127. The burner cap, 123 is secured to the burner head por- When the burner cap 123 is secured tothe burner head 121, there is formed a closed annular space which is supplied with a mixture of air and gas, from the passageway in the mixing tube. Thismixturefof gas and air may flow upward through a plurality of clusters of openings such as are shown at 131, at 132 and, at,.133, each of the clusters being drilled in one of a plurality of bosses secured to or formed integrally with upper member 123.. Such gases may also flow out through any. one of a plurality of peripheral openings 134. and 135. The

peripheral openings

134 and 135 are formed by the cooperation of ribs, such as 136, 137, 138, 139, 140, 141 142, 143, 144, etc. whichare formed on and extended downward from a circular flange of the burner cap 123; and a corrugated separator ring or spacer member 145 interposed between the burner cap 123 and the burner head 121. The ribs 36, 37, etc. extend all of the way around the periphery of the circular flanges of the burner cap123. Slots such as 134 are thus formed by the contact with the separator ring of ribs such as the ribs 136,137,138, 139 and 1.40 which are formed on and extend down from the periphery of the burner cap 123 to contact with the separator member. Slots, such asthe slot 135, are also formed immediately below the slots 134 by the spacing of the corrugated separator 145 from the smooth annular rim of the raters" burner head portion 121. Each pair of the

slots

134 and 135 are thus parallel to each other and are separated only by the width of the corrugated separator 145. The flames of the gases issuing from each pair of such slots merge into a single flame as shown at 146 in Fig. 2. The width of the slots, the distances between the slots in this embodiment as well as in all of the following embodiments conform tothe dimensions and distances previously discussed above. Thus the distance between the upper and lower slots of each pair of

slots

134 and 135 is relatively small so that the two flames merge as at 146, but the distance between the slots 34 and 35 and the next adjacent pair of slots is greater so that the flames are separated throughout most of their length but are contiguous adjacent to their bases as shown at 147 and 148. There is thus provided a series of pairs of upper and lower parallel relatively narrow and long horizontal slots extending around the circumference of the two flanges and providing a series of fingers of flames. The burner moreover has adequate port area and the individual ports have the required restriction in size and are spaced for proper aeration. The cap 123 is properly aligned with the burner head 121 when bolt 128 is tightened.

The following five features of this embodiment of my invention should be noted: (1) The

slots

134 and 135, etc. are formed at least in part by the ribs 136-144, inclusive, etc. The ribs 136-144 being formed on the lower surface of the burner cap 123 cooperate with the toothed separator ring or spacer member 145 to form the slots. This separator ring 145 is formed with indentations. The indentations in the separator ring member 145 are about one-half the depth of the ribs 136-144, etc. and consequently the teeth of the spacer member 145 extend only about one-half way into the slots formed by the ribs 136-144, etc. dividing the space into a series of pairs of parallel slots; (2) The flange of the burner head has no ribs, but on the contrary has a plane upper surface. Obviously (although in practice preferably not) some or all of the ribs could alternatively be formed on the mixing tube member. If only some of the ribs were formed on the burner head member then the remainder of the ribs would be formed on the cap; (3) The spacer member 145 is formed with a series of indented (i. e. pressed in) teeth so as :to cooperate with the ribs on the burner cap to form the slots; (4) The burner cap 123 is. secured to the burner head member 121 by a screw 128; (5) The separator member 145 is positioned and held in position by a plurality of pins or rivets such as for example the rivet 151 which extends hole 151a.

In Figs. 4-6 inclusive, I show several slight modifications of the burners shown in Figs. l-3, inclusive.-

Therein like and similar parts are indicated by the same numerals as in Figs. 1-3, inclusive, with the addition of 100. It will be noticed that the burner of Figs. 4-6, inclusive, differs mainly in five respects: (1) The ribs 236-244, inclusive, etc. are about as deep as :the ribs 136-144, and are formed on the burner cap member 223; (2) The ribs 236-234, inclusive, etc. are also formed with vertical slots such as 261-269, inclusive; (3) The flange of the burner head member has no ribs, but on the contrary, has a plane upper surface; (4) The separator member 245 is formed with indentations each about half the depth of the ribs 236-244 so as to form a series of separated parallel slots in a mannersimilar to the structure of Figs. 1, 2 and 3; (5) The burner cap 223 is secured to the burner head 221 bybeing screwed into threads formed in the center of the burner head as at 228.

The slots 261-269, inclusive, provide a series of shorter through a rivet I flames between each of the longer flames formed by the adjacent pairs of horizontal slots. It produces an attractive flame pattern consisting of a series of longer flames that are interposed with a series of Shorter flames. The longer flames and the shorter flames are contiguous with one another adjacent to their bases so that proper spreading of the flames occur when lighting the burner.

Burners constructed according to my invention are designed for use for all kinds of fuel gases without any variation in the size of the ports. This means that they are made only one way for all kinds of gases which includes manufactured gases, natural gases, bottle gases (liquified petroleum gases) such as propane and butane, the propane-air and the butane-air gases, and mixtures of these gases of all heating values and also for the various reformed gases, including manufactured gases to which propane and butane have been added. A burner that will operate properly with all of the gases mentioned above may be known as a universal burner. My burners are also very economical to manufacture because of the small number of pieces by which they are formed.

My burner caps are preferably die cast from an aluminum alloy in which case their melting point would be about 1150 F. Aluminum, however, softens at a much lower temperature. So, it is important to not overheat the cap. Consequently, the ribs are spaced approximately as shown so as to conduct the heat from the burner cap through the separator and into the burner head which is obviously always much cooler than the cap. The separator is thus an intermediary heat conductor between the cap and the burner head. While the cap is made of an alloy or metal having a relatively low melting temperature, the separator is made from sheet steel which has.

a relatively high melting temperature.

In the operation of the burners disclosed gas is introduced into the mixing tubes (tube 122, or tube 222) and there mixed with primary air which flows into an annular space and thence issues through the peripheral ports (

ports

134, 135, or

ports

234, 235, 261-269) and the.

clusters of center ports (clusters of

ports

131, 132 and 133 and 23.1, 232, and 233) where because of the small dimensions of the ports there is no tendency for flash back or after pop. Because of the small distances be tween the upper and lower port of each pair of upper and lower peripheral ports, such pair of ports forms a single flame as shown in Fig. 3. Because the ports are spaced peripherally apart a sufficient distance, no ribbon flame is formed but instead my burner forms a series of flames that are readily aerated as indicated in Fig. 1'. Because of the relatively large number of relatively small ports, sufficient port area is provided to fulfill the requirements of the port area necessary to eliminate yellow flames, carbon deposit, flash back, and lifting or blowing of the flames from the ports. Because of the unique construction, the necessary total port area with the necessarily relatively small ports is provided in a construction which is eflicient, inexpensive to manufacture and wholly satisfactory.

It is to be understood that the above described embodiments of my invention are for the purpose of illustration only and various changes may be made therein without departing from the spirit and scope of my invention,

Iclaim:

1. A burner head for gas burners comprising an upper member; a lower member, one of said members being formed with an annular surface having a plurality of spaced ribs forming a plurality of spaced channels therebetween, the other member being formed with an annular surface having a substantially plane face opposed to said ribbed surface; and a separator ring having two opposed faces interposed between said upper and lower members, said ring being formed with a plurality of spaced projections formed on and projecting from the face of said ring faced toward said ribbed member and forming a plurality of spaced indentations therebetween and being formed with a plurality of spaced grooves within the other face of said ring and positioned opposite to said projections; said projections corresponding in number to the number of, but not being aligned with, said ribs, cor- -7 responding in width substantially to the width 'of, and aligned with, the channels formed between said ribs, and having a height less than the height of said ribs; and said projections being arranged to embrace (said ribs within the indentations formed between said projections so as to form a pair of substantially parallel series of ports producing a series of peripheral flames, each of the ports of each series being separate from and spaced laterally from each other port of the same series and aligned vertically with and spaced vertically from the corresponding port of the adjacent series and so arranged that the flow of gas to each port is augmented by the flow of gas to the vertically aligned port to, produce asingle series of spaced peripheral flames. r p

, 2. A burner head for gas burners comprising an upper member formed with an annular surface having a plurality of spaced ribs forming a plurality of sp'aced'channels therebetween; a lower member formed with an annular surface having a substantially plane. face opposed to said ribbed surface; and a separator ring having two opposed faces interposedbetween said upper and lower members which said ring is formed with a plurality of projections formed on and projecting from the upper face of said ring forming a plurality of spaced indentations therebetween and is formed with a plurality of spaced grooves within the lower face of said ring positioned opposite to said projections; said projections corresponding in number to the number of, but not aligned with, said ribs, corresponding in width substantially to the width of, and aligned with, the channels formed between said ribs, and corresponding in height to about one half the height of said ribs; and said projections being arranged to embrace said ribs within the indentations formed between said projections so as to form a pair of substantially parallel series of ports producing a series of peripheral flames, each of the ports of each series being separate from and spaced laterally from each otherport of the same series and aligned vertically with the corresponding port of the adjacent series and so arranged that the flow of gas to a each port is augmented by the flow of gas to the vertically aligned port to produce a single series of spaced peripheral flames, each having a single inner cone.

3. A burner head for gas burners comprising; an upper member formed with an annular surface having a plurality of spaced ribs forming channels therebetween, each said rib having a width substantially less than its height; a lower member formed with an annular surface having a substantially plane face opposed to said ribbed surface;

and a separator ring formed by corrugating a thin metal strip of a thickness substantially less than, the width of said ribs, having, an upper face and a lower face, and

being interposed betweensaid upper and lower members,

said ring being formed with a plurality of projections formed on and projecting from the upper face of said ring, thus forming a plurality of spaced indentations there between, and being formed with a plurality of spaced grooves within the lower face of said ring positioned opposite to said projections; said projections facing toward said ribs, corresponding in number to the number of, but not aligned with, said ribs, corresponding in width substantially to the width of, and aligned with the channels formed between said ribs, and having a height less than the height of saidribs; and said projections being arranged to embrace said ribs withinthe indentations formed. be-

tween said projections so as to form a pair of substan tially parallel series of'ports producing, a series. of. peripheral flames, each of the ports of each series being series and so arranged that the flow of' gas from each port is augmentedbytheflow of gas from the vertically aligned port to produce asingleseries of spaced peripheral flames whichare contiguous at their-bases but spaced substantially throughout the :trest. of their lengths 4. A burner head for gas burners comprising; a mixing tube member; a burner cap member; each said member being formed with a circular flange, one of said flanges being formed with a plurality of spaced ribs forming a plurality of spaced channels therebetween, and the other flange being formed with a substantially plane face opposed to said ribbedsurface; and a separator member having two opposed sides interposed between said flanges, said separator member being formed with a plurality of projections formed on and projecting from one side of said member and forming a plurality of spaced indentations therebetween and said separator member being formed with a plurality of spaced grooves within the other side of said member positioned opposite to said projections; said projections facing toward said ribs, corresponding in number to the number of,,but not aligned with, said ribs, corresponding in width substantially to the width of, and aligned with, the channels formed between said ribs and having a height less than the height of said ribs; and said projections being arranged to embrace said ribs within the indentations formed between said projections so as to provide a pair of substantially parallel series of ports producing a series of peripheral flames, each series being separated from the adjacent series by said separator member interposed between said flanges, and each of the ports of each series being separate from and spaced laterally from each other port of the same series and aligned vertically with and spaced vertically from the corresponding port of the adjacent series and so arranged that the flow of gas to each port is augmented by the flow of gas to the vertically aligned port to produce a single series of spaced peripheral flames.

5. A burner head for gas burners comprising; an upper member formed with an annular surface having a plurality of spaced ribs forming a plurality of spaced channels therebetween; a lower member formed with an annular surface having a substantially plane face opposed to said ribbed surface; and a separator member having two opposed sides interposed between said upper and lower members, said separator member being formed with a plurality of spaced projections formed on and projecting from one side of said member, forming a plurality of spaced indentations therebetween, and said separator member being formed with a plurality of spaced grooves within the other side of said member positioned opposite to said projections; said projections facing toward said ribs, corresponding'in number to the number of, but not aligned with, said ribs, corresponding in width substantially to the width of, and aligned with the channels formed between said ribs, andhaving a height less than the height of said ribs; and said projections being positioned' to embrace the said ribs within the indentations formed between said projections so as to provide a pair of substantially parallel series of ports producing a series of peripheral flames, each of the ports of each series being separate from and spaced laterally from each other port of the same series by said ribs and aligned vertically with and spaced vertically from the corresponding port of the adjacent series by said separator member which is interposed between said upper and lower members and soarranged that the flow of gas to each port is augmented by the flow of gas to the vertically aligned port to produce a single series of spaced peripheral flames.

6. A burner head for gas burners comprising; an upper member; a lower member, each said member being formed with a substantially circular flange, one of said flanges being formed with a plurality of spaced ribs forming a plurality of spaced channels therebetween, and the other flange being formed with an annular surface having a substantially plane face opposed to said ribbed surface; and a separator member having two opposed sides interposed between said flanges, said separator member being formed with a plurality of projections formed on and projecting from one side of said separator member, faced toward-said ribbed member, and forming a plurality of spaced indentations therebetween, and said separator member being formed with a plurality of spaced grooves within the opposite side of said separator member which are positioned opposite to said projections; said projections corresponding in number to the number of, but not aligned with, said ribs, corresponding in width substantially to the width of, and being aligned with, the channels formed between said ribs, and having a height less than the height of said ribs; and said projections being positioned to embrace said ribs within the indentations formed between said projections; whereby said separator member cooperates with said upper and lower members to form a pair of substantially parallel series of ports producing a single series of peripheral flames, each of the ports of each series being substantially in vertical alignment with a corresponding port of the other series and each port being separate from and spaced laterally from each other port of the same series and aligned vertically with and spaced vertically from the corresponding port of the adjacent series, and the flow of gas from each port being augmented by the flow of gas from the vertically aligned port to produce the single series of spaced neripheral flames.

7. A burner head for gas burners comprising; an upper member; a lower member, each of said members being formed with a substantially circular flange, one of said flanges being formed with a series of ribs forming a series of channels therebetween; and a separator member having two opposed sides, formed of a metal having a higher melting temperature than the metal of the cap, said separator member being formed with a series of projections formed on and projecting from one side of said member, and forming a series of indentations therebetween, and said separator member being formed with a series of grooves within the opposite side of said member positioned opposite to said projections; said projections corresponding in number to the number of, but not aligned with, said ribs, corresponding in width substantially to the width of, and aligned with, the channels formed between said ribs, and having a height about onehalf the height of said ribs; said separator member being interposed between said flanges and cooperating therewith to form a pair of substantially parallel series of ports producing a single series of peripheral flames, each of the ports of each series being substantially in vertical alignment with a corresponding port of the other series and each port being separate from and spaced laterally from each other port of the same series and aligned vertically with and spaced vertically from the corresponding port of the adjacent series, and the flow of gas from each port 'being augmented by the flow of gas from the vertically aligned port to produce the single series of spaced peripheral flames.

8. A burner for gas comprising a burner head having an upper member and a lower member each formed with a substantially circular flange and one of the flanges being formed with a series of ribs and having a separator member interposed between said flanges, said separator member having a plurality of projections formed on and projecting from the side of said member facing toward said ribs forming :a plurality of indentations therebetween and said separator member being formed with a plurality of grooves within the opposite side of said member positioned opposite to said projections, said indentations formed between said projections corresponding in number to the number of ribs, corresponding in width substantially to the width of said ribs, having a depth less than the height of said ribs, each positioned to embrace one of said ribs and said separator member cooperating with said flanges to form a series of horizontally extending ports producing a single series of peripheral flames, each of the ports of each series being separated from the adjacent port of the same series by one of said ribs and each rib being separate from and spaced laterally from each other rib of the same series and each port 10 a being aligned vertically with and spaced vertically from the corresponding port of the adjacent series, and the flow of gas from each port being augmented by the flow of gas from the vertically aligned port to produce the single series of spaced peripheral flames.

9. A burner for gas comprising a burner head having an upper member comprising a burner cap made of aluminum and a lower member each formed with a substantially circular flange and one of said flanges being formed with a series of ribs and said burner having a separator member made of sheet metal having a series of projections formed on and projecting from the side of said separator member, facing toward said ribs and forming a series of indentations therebetween which indentations are spaced equally with said ribs and each shaped and positioned to embrace a portion of one of said ribs, said separator member being formed with a series of grooves within the opposite side of said member positioned opposite to said projections, said separator member being interposed between said flanges and cooperating therewith to form a pair of substantially parallel series of ports producing a single series of peripheral flames, each of the ports of each series being separated from the adjacent port of the same series by one of said ribs and each port being aligned vertically with and spaced vertically from the corresponding port of the adjacent series, and the flow of gas from each port being augmented by the flow of gas from the vertically aligned port to produce the single series of spaced peripheral flames.

10. A burner for gas comprising a burner head having an upper member and a lower member each formed with a substantially circular flange and one being formed with a series of ribs in each of which there is provided a vertically extending slot through which gas issues to form a vertically extending flame and having a separator member including a series of projection-s formed on and projecting from the side of said separator member facing toward said ribs and forming a series of indentations therebetween which indentations are spaced equally with said ribs and each shaped and positioned to embrace a portion of one of said ribs, said separator member being formed with a series of grooves within the opposite side of said member positioned opposite to said projections, said separator member being interposed between said flanges and cooperating therewith to form a pair of substantially parallel series of ports producing a single series of peripheral flames, each of the ports of each series being substantially in vertical alignment with a corresponding port of the other series and each port being separate from and spaced laterally from each other port of the same series and aligned vertically with and spaced vertically from the corresponding port of the adjacent series, and the flow of gas from each port being augmented by the flow of gas from the vertically aligned port to produce the single series of spaced peripheral flames.

11. A burner for gas comprising a burner head having an upper member and a lower member each formed with a substantially circular flange and one being formed with a series of ribs forming a series of channels therebetween, each rib having a port through which gas issues to form a peripherally extending flame, and having a 'separator member interposed between said flanges and including a series of hollow projections formed on and projecting from one side of said separator member and forming a series of indentations therebetween and said separator member being formed with a series of grooves in the opposite side of said member positioned opposite to said projections, said projections facing toward said ribs, corresponding in number to the number of, but not aligned with, said ribs, corresponding in width and shape substantially to the width and shape of, and aligned with, the channels formed between said ribs, and having va height less than the height of said ribs; said projections being positioned to embrace said ribs within the chan- 11 nels formed between said projections, whereby said separator member cooperates with said upper and lower member to form a pair or substantially parallel series of ports, each of the ports of acli series being substantially in vertical alignment with the corresponding port of the other series and each-port being separate from and spaced laterally from each other port of, the same series and aligned vertically with and Spaced vertically from the corresponding port of the adjacent series.

12.. A burner for gas comprising a burner head having an upper member and a lower member each formed with a substantially circular flange, one flange being formed with a substantially smooth surface, and the other flange being formed with a series of ribs and each said ri-b being formed with a vertically extending slot which gas issues to form a peripherally extending flame, and the ribs of the one flange contacting and cooperating with the smooth surface of the other flange to provide a series of peripheral ports, each of which ports is horizontally interposed between a pair of said ribs and thus between a pair of said-vertically extending slots and through each of which ports gas issues to form a peripherally extending flame.

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