US2711215A - Gas burner - Google Patents

Description

June 21, 1955 Filed April 7. 1948 H. A. SQUIRE ETAL GAS BURNER 4 Sheets-Sheet 1 June 21,1955 H. A. sQUlRE m 2,71 1

GAS BURNER 4 Sheets-Sheet 2 Filed April 7, 1948 FIG. 7

June 21, 1955 H. A. SQUIRE EI'AL 2,711,215

GAS BURNER Filed April 7, 1948 4 She etS-Sheet 5 flrraxnaya June 21,1955 H. A. SQQIRE Em GAS BURNER Filed April 7, 1948 4 Sheets-Sheet 4 0000601000000 cocoa 2 A? 6 i 0 "w 2 we V .1 6 m4 m i fiF mm 1 i. d i m n" #L d 1 w United States Patent GAS BURNER Harris A. Squire, Chagrin Falls, and Louis A. Sacha, In, East Cleveland, Ohio, assiguors to Perfection Stove Company, Cleveland, Ohio, a corporation of Ohio Application April 7, 1948, Serial No. 19,554

19 Claims. (Cl. 158-116) This invention relates to the class of gas burners. While it has to do, principally, with gas burners that are especially suitable for use in domestic cooking stoves and ranges, it is also applicable, in some forms, to gas burning heating stoves, furnaces, water heaters and the like.

One object of the invention is the production of a the provision of a gas burner comprising sheet metal :3:

parts, and wherein certain of said parts are arranged to form inner and outer walls, or multiple walls, that are spaced apart a distance substantially no less than the thickness of said walls and which walls contain the gas emitting ports. By such a multiple wall arrangement, $2.;

the requisite port depth, relative to port diameter, is effected in 'a sheet metal construction.

Another object is to provide a gas burner in which the portion of the burner head that is subjected to in tense heat, is of multiple, spaced, wall construction, to the end that the gas inside the burner head is kept relatively cool, and backfiring into the mixer is accordingly prevented to a large degree.

Another and similar object of the invention is to minimize fiash back, and what is known as noise of extinction, when the burner is turned 01f, by so constructing the burner head that a small chamber is provided wherewith the gas emitting ports communicate intermediate their inner and outer ends. The small quantity of gas thus segregated from the main body enclosed by the burner head gently issues from the ports after the gas supply to the burner is shut OE and is quickly and quietly consumed without explosive force sufiicient to cause flash back.

Another object of the invention is the economical production of a light weight, durable gas burner of relatively simple construction involving sheet metal parts that are capable of being easily and quickly produced with precision and readily assembled.

Another object is to provide a gas burner that responds readily to heating requirements in that it heats up quickly when lighted and cools rapidly when shut off. This results from the fact that the mass of the burner is of low heat retaining capacity.

All of the foregoing objects, with others that will appear as this description proceeds, are attained in the several embodiments of the invention illustrated in the accompanying drawings wherein similar reference characters designate like parts throughout the views.

In the drawings, Fig. 1 is a central vertical section through an assembly including one form of burner and mixer and a supporting frame, the burner being of the 2,711,215 Patented June 21, 1955 style having an annular head; Fig. 2 is a plan view of the burner shown in Fig. 1; Fig. 3 is a sectional detail on the line 3-3 of Fig. 2; Fig. 4 is a plan view of the mixer and supporting frame shown in Fig. 1; Fig. 5 is a horizontal section through the mixer on the line 55 of Fig. 1; Figs. 6 and 7 are central vertical sections through the annular heads and adjacent portions of the mixing tubes of burners similar to that shown in Fig. 1; Fig. 8 is a plan view, and Fig. 9 a side elevation, partly in section, of a circular head burner made in accordance with the invention, the latter view including a modified form of mixer and the gas supply parts associated therewith; Fig. 10 is a sectional detail on the line 10-10 of Fig. 8; Fig. 11 is a detail in elevation of the lower end portion of the mixing or venturi tube and the part of the mixer incorporated therein of the burner shown in Fig. 9; Fig. 12 is a similar View of the cylindrical shutter of the instant mixer; Fig. 13 is a horizontal section through said mixer on the line 1313 of Fig. 9; Fig. 14 is a central vertical section through the head and adjacent portion of the mixing tube of a modified form of the circular head burner; Fig. 15 is a plan of the burner shown in Fig. 14; Figs. 16 and 17 are views corresponding, respectively, to Figs. 14 and 15, of a further modified form of the invention; Fig. 18 is a fragmentary sectional side elevation, and

Fig. 19 a plan view, of another modification of the circular head burner; Fig. 20 is a central vertical section through the upper portion of a burner wherein the head is of triple wall construction, the walls containing the gas emitting ports being spaced equal distances apart; Fig. 21 is a view similar to Fig. 20 of a modification of the triple wall burner head; Fig. 22 represents a side elevation, partly in section, of an elongated oven burner construc ted in accordance with the invention; Fig. 23 is a bottom plan view of the burner of Fig. 22; Fig. 24 is a section on the line 24 24 of Fig. 22; Fig. 25 is a perspective view of a baffle employed in the oven burnerdisclosed in the previous views, and Fig. 26 is a fragmentary side elevational view of a modified form of oven burner.

In the assembly of Fig. 1, the burner unit is desig- 1 is made up of an outer inverted channel member or flanges or walls spaced from those of the outer shell ex-' cept where they flare outwardly and contact the flanges or walls of the outer shell or member some distance above the lower edges thereof. Inserted within the bottom of the outer member or shell with its inner and outer edges contacting the corresponding edges of the inner member a is an annular bottom wall 41. This wall is also shown as a shallow channel in that its inner and outer edges are curved upwardly, and at diametrically opposite locations, the bottom wall has elliptical apertures about which the material of the wall is turned downwardly to provide shallow bosses Q The foregoing elements of the burner head are bound tightly together by bolts a that are projected downwardly through vertically aligned apertures in the top walls or webs of the channel members or shells a and a and the bottom wall a and have nuts 11'' applied to their lower ends. As

or walls of the channel members or shells a and a and they are arranged in two circumferential rows, the ports of the two rows desirably being staggered with respect to each other. While the inner and outer end portions of the ports are shown in direct alignment, this is found to be unnecessary, so far as satisfactory performance of the burner is concerned. The inner walls or flanges er the members or shells a and a are shown as having a single row of ports n The ports may be punched or drilled in the sheet metal of which the members or shells at and a are made, and for the sake of durability, a metal is preferably used that will not deteriorate under intense heat, or corrode. Among metals especially suited for the purpose is stainless steel.

The mixing tube a is shown as generally Y-shaped, the branches thereof being curved, and gradually enurging toward their upper ends and assuming an elliptical shape and size that correspond in these respects with the bosses a of the bottom wall a to which said branches are butt welded. The stem of the mixing tube tapers downwardly and its circular lower end is also butt welded to the correspondingly shaped upper end of a frusto conical portion or bell (2 This portion terminates at its lower end in a cylindrical part that is fitted into a nestei' tube 0 to which said part is fastened, as by welding. The nester tube n has an outwardly extending flange 11 at its upper end. Please notice that the mixing tube (1 and the hell (1 constitute a venturi of common character. 7

The mixing tube 11 embracing the branches a and the tapered stem, is preferably constructed of two ide'n tical sheet metal stampings, the edges of which are abutted and welded together, thus forming, in effect, an integral unit. Accordingly the tube is shown crossha'tched in Fig. 1, notwithstanding the fact that the plane of section coincides with the area of contact between the two halves, as indicated by the line x in Fig. 2.

The supporting frame C is Hshaped, and is constructed of strap metal of suitable width and thickness. It includes side members 0 that have outturned feet 0 provided with apertures for suitable fastening means by which the frame may be attached to a part of a stove or 7 other structure. Each side member is turned outwardly at its upper end to form a lug c that is provided with a relatively large hole. The side members cf are tied together by a cross piece c which has its ends turned down and welded or otherwise fastened to the side mem ber's about midway between their upper and lower ends.

Conduit means for supplying gas to the burner includes an elbow c and a threaded nipple 0 the latter being projected upwardly through a central opening c in the cross piece a of the supporting frame. The flanged end of the elbow c engages the other side of said cross piece while a nut that is threaded onto the nipple c is screwed down tightly against the cross piece to clamp the 'parts firmly to the supporting frame. Screwed onto the nipple c is a nozzle 0 of usual character having a gas emitting orifice 0 An outer stationary member b of the mixer B consists of a cylindrical cup-like element having a flat bottom wall :5 provided with a central opening that is surrounded by an internal boss b that receives the nozzle e The upper end of said cup-like element is flanged outwardly and shaped to provide arms b and lugs b (Fig. 4). The outer ends of the arms 12 overlie the lugs l: of the supporting frame C and have holes aligned'with those of said lugs and extended through the holes of both are so-called push rivets, e that serve to firmly but detachably connect the mixer to the supporting frame.

The shutter 12 of the mixer B is in the form of a cylindrical sleeve that has an easy working fit within the cylindrical portion of the outer stationary cup-like member b and at its upper end is provided with an outwardly extending flange b Surrounding the shutter b and welded theretointermediate its ends is a ring-like member 12 which includes laterally extending lobes I2 having equal to the radial spacing of threaded apertures in the' lugs b of the outer member b of the mixer. Screws 12 extend through the slots I1 and are threaded into the apertures of the lugs b and by holding engagement of the heads of these screws with the adjacent parts of the lobes Z1 the shutter may be immovably secured to the outer member 12 in any adjusted position. The cylindrical wall of the member b is provided with slots b (Fig. 5) that override the slots I2 of the shutter b Thus it will be seen that, by rotating the shutter by means of the lobes I1 upon loosening the screws b the slots 11 may be brought into any desired overlapping relation to the slots 11 of the outer mixer member 12, thereby to properly proportion the air supply to the gas supply issuing from the orifice 0 In order to obtain an accurate minimum air supply, each of the slots 11 is graduated by forming a rounded notch I7 in an end wall thereof.

The burner is properly positioned with respect to, and.

evident from this that the burner may be lifted out of the assembly and returned thereto without disturbing the adjustment of the shutter.

in the form of the invention illustrated in Fig. 6, and generally designated A, the burner head is made up of an outer channel-like shell (1 and an inner channel-like shell a the radially spaced flanges or walls of the former diverging for a part of their depth and then continuing to their lower edges in substantially cylindri cal form. The inner and outer walls or flanges of the respective shells are spaced apart excepting where the lower edges of those of the inner shell are curved toward and engage those of the outer shell at about the junction of the tapered and cylindrical portions of the latter. The top walls or webs of the two shells are shown in contact and as bound together by rivets a. A bottom wall a, in the form of a shallow downwardly opening channel,

fits within the bottom of the outer shell n the lower edges of the radially spaced walls ofthe latter being welded to the adjoining flanges of the bottom Wall.

a of the bottom wall a.

walls or flanges of the shells n and n and with a single row of ports a in the inner walls or flangesthereof.

Another manner of constructing an annular burner head in accordance with the invention is shown in Fig.

7, where an inner channel member or shell a is nested within an outer channel member or shell a. Here, the

burner is designated, generally, by the reference charac The side walls 'or flanges of the inner shell are ter A spaced from those of the outer shell, excepting where the former are flared outwardly at their lower ends into contact with the adjacent portions of the outer shell; the inner wall or flange of the inner shell being shown somewhat deeper than the outer wall or flange thereof. Engaged upwardly within the outer member or shell a is an annular bottom wall a, the peripheral portion of which} l is curved upwardly into engagement with the outer wall 7 or flange of the inner member or shell 21 The deeper" inner Wall or flange of the inner shell meets the adjacent flat edge portion of the bottom wall a.

forming the lower edge portion c1 of the outer wall or flange of the outer shell downwardly about the complementarily curved peripheral portion of the bottom wall a. The shells a fand n have gas emitting ports Y arranged as in the previously described forms of the invention.

Butt welded to shallow bosses af ofthe bottom wall in this case, the two shells and the bottom wall are held together 'byf a are the upper ends of the branches of a Y-shaped mixing tube a, the present tube differing from those previously described in that edge flanges a are formed on the two sheet metal halves of the tube and are spot welded together.

In the form of the invention next to be considered, and which is illustrated in Figs. 8 to 13 and is designated, generally, by A a circular burner head (as distinguished from the annular type previously described) is constructed of an outer shell a and an inner shell a The lower edge portion or" the former is flared outwardly to produce an annular horizontal flange that is curled downwardly at its periphery, while the corresponding portion of the inner shell :1, which inner shell is of considerably less depth than the outer shell, is curved outwardly into contact with the adjacent wall portion of the outer shell, thereby to properly space apart the major portions of the peripheral walls of the two shells. A circular bottom wall a has its edge portion curled upwardly so that the diameter of said wall is approximately the same as that of the perimeter of the inner shell (1 Now, with the inner shell nested within the outer, and the bottom wall a engaged within the outer shell and against the edge of the inner shell, the parts are bound together by two bolts 11 that are extended through aligned apertures in the shells and bottom wall and have nuts a (Fig. applied to their threaded lower ends. The tapered head of each bolt seats within a depression formed by countersinking the portion of the top wall of the outer shell about the aperture through which the bolt extends, such countersunk 3 portion being accommodated by an enlarged aperture in the top wall of the inner shell. The burner head is provided with gas emitting ports a, shown as arranged in two rows that extend circumferentially about the head and penetrate the peripheral walls of the two shells, the ports in one row being staggered with respect to those in the other.

Surrounding a central opening in the bottom wall a is a boss a This boss is formed by flanging the sheet metal of said wall downwardly about the above mentioned opening, the boss being slightly downwardly convergent to closely embrace the reversely tapered upper end of a mixing tube (1 This tube, which continues to taper to a somewhat smaller diameter at the bottom, is formed of two sheet metal halves having edge flanges @2 and a, respectively, that are engaged face-to-face and spot Welded together, the flanges stopping short of the upper end of the tube to permit the above described connection between the tube and bottom wall at, the joint between the tube and said wall being welded.

Fitted into the lower end of the mixing tube i1 and welded or otherwise secured thereto, is the appropriately shaped upper end of a bell a that is desirably drawn from sheet metal and has a cylindrical extension a (Fig. 11) at its lower end that forms a part of the mixer designated, generally, by the reference character B. Rotatable upon the extension a is a cylindrical cup-like shutter b having diametrically opposed slots b in the peripheral wall that are adapted to override slots a in the extension a of the mixing tube. The slots b are shown as extending above the slots a (Fig. 9) and, at one of their top corners, as extending beyond the corresponding end of said slots 11 to accommodate screws b These screws are threaded into holes a in the extension a so that the heads of the screws overlie the adjacent part of the shutter and serve, When the screws are drawn up tightly, to lock the shutter in position.

The bottom wall of the shutter b has a central aperture for the reception of a gas supply nozzle 0 incorporated in conduit means that is attached to a support e These parts may be the same as the supporting frame and gas supply means previously described, and illustrated in Fig. 1.

It is apparent from the foregoing that, in the present case, the mixer B is carried by the burner, and is removable and replaceable therewith on occasions of inspection and cleaning of the burner. However, with the shutter [1 locked to the extension a of the mixing tube assembly, its adjustment need not be disturbed during the removal, handling and replacement of the burner.

The head of the burner A illustrated in Figs. 14 and 15, ditters only slightly from the circular burner head last described. The present construction is somewhat simpler than the former in that the outer shell a has a straight, downwardly divergent peripheral Wall, and the annular bottom wall a is flat and bears upwardly against the perimeter of the inner shell a when the latter and said bottom wall are inserted into the outer shell and are bound thereto by bolts 11 These bolts are extended through aligned apertures in the two shells and bottom wall, and the rounded heads thereof bear directly upon the top wall of the outer shell. Nuts a' are threaded onto the lower ends of the bolts and bear against the bottom wall a The upper end of a mixing tube a projects through a central opening of the bottom wall a that is surrounded by a depending flange n to which the tube is welded. The gas emitting ports of the burner head are designated a.

With reference to the head of the burner A illustrated in Figs. 16 and 17, an inner shell 01 is nested within an outer shell a the lower edge of the peripheral wall of the former being flared outwardly into contact with the adjacent portion of the corresponding wall of the latter, whereby said wall of the inner shell is held in spaced relation to the peripheral wall of the outer shell. The two shells are fastened together by rivets that extend through aligned apertures in the top walls of the shells. A circular bottom wall a has an upstanding peripheral flange n that is engaged with and welded to the underside of the outwardly flanged lower end (I of the outer shell. In order to reduce the gas space of the. present burner head, so as to avoid an undesirably large quantity of gas being present therein, the bottom wall a is made re- 75 flange a of the outer shell.

entrant throughout its central region, and a central opening of said wall is surrounded by 21 depending flange a. to which the upper end of a mixing tube a is butt welded. Figs. 18 and 19 show a burner A wherein the head is constructed of an outer shell 1 and an inner shell a the former being gradually flared outwardly at its lower end into a horizontal flange. The major portion of the peripheral wall of the inner shell is spaced from the corresponding wall of the outer shell, while adjacent its lower end the inner shell is flared into contact with, and follows the contour of, the outer shell. (1 is a circular bottom wall that is formed about its edge to fit within the flared lower end of the inner shell. The edge portion of the outer shell extends beyond the corresponding portions of the inner shell and bottom wall and is crimped thereabout to bind the shells and bottom wall firmly together. Gas emitting ports a extend through the spaced peripheral walls of the shells in two circumferential rows. To a shallow boss (1 that surrounds a central opening in the bottom wall 42 is butt welded the upper end of a mixing tube at.

The burnerA shown in Fig. 20, is characterized by a triple wall head composed of an outer shell a an inner shell a and an intermediate shell a The top walls of the three shells are engaged one with another and are held together by rivets a while the major portions of the peripheral walls of the shells are spaced apart. At their lower ends, the peripheral walls of the intermediate and inner shells are flared outwardly into contact with the adjacent portion of the corresponding wall of the outer shell, and below the bottom plane of the inner shell, said Wall of the outer shell curves outwardly and merges into a'horizontal flange a the outer edge of which is curved downwardly. a is a circular bottom wall which has an upstanding edge flange a that is engaged with and welded to the underside of thehorizontal The bottom wall has a central opening surrounded by a depending flange a to which is butt welded the upper end of a mixing tube r1 Gas emitting ports continue through the peripheral walls of the three shells from the interior to the exteriorof the burner head, the ports being designated r1 Fig. 21 shows a burner, designated A incorporating another form of triple wall burner head that is made up of nested outer and inner shells (1 and ri respectively, and an inverted cup-like member a The shells (1 and (1 correspond to the outer and intermediate shells of the form of the invention last described, while the inverted cup-shaped member a corresponds to the inner shell. It includes a perforated cylindrical wall through which the gas is fed from the interior of the burner head to the space between the member a and the inner shell c Gas emitting ports are formed in the inner and outer shells, as indicated at a and the top walls of the member a and the two shells are fastened together by rivets a A bottom wall a similar to .the one last described, is welded to the horizontal flange of the outer shell, and the upper end of a mixing tube a is butt welded to a flange surrounding a central opening in said wall.

Figs. 22 to 25 show the invention incorporated in a burner A having an elongated head and which is of the class used in ovens, although a burner of this type may have more general application. Here the burner head consists of an outer shell 61 and an inner shell a each in the form of a long narrow pan. The shells are nested one within the other, and the peripheral wall of the inner shell is spaced from the corresponding wall of the outer shell. The peripheral walls of the two shells terminate at their tops in flat horizontal flanges arranged with the one on the inner shell overlying that of the outer shell, and both flanges, and accordingly the shells, are held firmly together by the crimped over edge portion 4: of a top wall a Gas emitting ports 41 extend through the peripheral wall of the shells. The upper end of a mixing tube a is welded to the bottom wall of the outer shell about a central opening a therein that registers with an opening a in the bottom wall of the inner shell. To better distribute the gas throughout the length of the head, and in order to avoid too much gas issuing from the ports in the immediate vicinity of the mixing tube, a baflle 11 is disposed Within the head, the same being shown in the form of a channel (Fig. 25) the web of which has an opening [1 that registers with the openings in the bottom walls of the shells. The bathe is suitably connected, as by welding, to the inner shell.

The mixing tube is shown as curved and as terminating at its ends remote from the burner head in a hell 4: having a cylindrical extension on which is mounted a cylindrical cup-like shutter a of a mixer B similar to that shown in detail in Figs. 9 and ll to 13.

A modification of the so-called oven burner, shown in Fig. 26 and designated A includes an elongated burner head practically identical with the one last described. To the bottom wall of an outer shell a near one end of the burner head, is attached a mixing tube (1 In this case, the ports a extend along the sides of the burner head and about the end thereof remote from the mixing tube but not around the end adjacent the latter, as otherwise a preponderance of gas would escape from the burner head in the immediate vicinity of said tube. Consequently, there is no need of a baflle in the present head, as was the case with the previously described modiflcation.

In connection with those embodiments of our invention incorporating the horizontal flange that surrounds the lower portion of the burner head (as disclosed herein in Figs. 9, 16, and 18, for example), we may explain that said flange serves as a drip rim, as well as asupporting part for the burner in certain kinds of installations. It, in no way affects the operation of the burner.

Having thus described our invention, what we claim is:

1. A gas burner including a hollow head comprising thereto.

an outer'endless channe'l'member and a similar inner;- channel member nested within the former channel .mem-J her, the webs of the channel members being engagedwith each other while the flanges of the inner. channel mom-1 her are spaced from the flanges of the outer member, the flanges of the inner and outer members being provided with gas emitting ports, and an annular wall closingv the.

open sides of the channel members and, with the inner channel member, enclosing the gas space of the burner.

head, the head including means for admitting a gaseous mixture to said space. 2. A gas burner including a head comprising a down side of the outer member, a bottom wall occupying the.

open side of the outer channel member and having its edge portions engaged with the flanges of the inner channel member whereby said bottom wall and the innerv channel member enclose the gas space of the burner head, and means for securing the channel members and.

bottom wall together, the head including means for ad-, mitting a gaseous mixture to said gas space.

3. A gas burner according to claim 2, wherein the outer edge of the bottom wall is :curved upwardly into contact with the outer flange of the inner channel member, and the edge portion of the outer flange of the outer channel member is contracted about the outer edge por-.

tion of the bottom wall thereby to bind the channel members and bottom Wall together.

4. A gas burner including a head comprisingadown-i wardly opening annular outer. channel member and a similarly shaped and arranged inner channel member nested, within the outer channel member, the webs of: the members being engaged with each other while the fianges'of the inner channel member are spaced from the flanges of the outer member, the flanges of the inner and outer members being provided with gas emitting; 1

ports, the inner channel member havingthe edge portions of, itsflanges flared toward and engaged with the flanges of the outer member in spaced relation to the open side of the outer member, and an annular bottom wall occupying the open side of the outer channel mem-.

her and having its edge portions engaged with the flanges of the inner channel member, and means for securing the channel members and bottom wall together, the bottom wall having substantially diametrically opposed tubev openings for the application of a branched mixing 5. A gas burner according to claim 4, wherein the openings in the bottom wall are elliptical with their shorter axes extendingdiametrically of the burner head.

6. A gas burner according to claim 4, wherein the outer 7 it edge of the bottom wall is curved upwardly into contact with the outer flange of the inner channel member, and the edge portion of the outer flange of the outer channel member is contracted about the outer edge portion of the bottom wall thereby to bind the channel members and 1, bottom wall together. 7. A gas burner including a hollow head comprising an outer downwardly opening, annular sheet metal channel member, a similar inner channel member nested within the outer channel member and having its flanges spaced inwardly from those of the outer member, the flanges of the inner and outer members being provided with gas 1 emitting. ports, the inner channel member being of less depth than the outer channel member and having theedge portions of its flanges flared toward and in contact 5 with the flanges of the outer member, the webs of the,

channel members being engaged with each other, an annular bottom wall within the open bottom of the outer channel member and having inner and outer edge flanges secured to the flanges of the outer member, said bottom wall having substantially diametrically opposed openings, and depending flanges surrounding said openmgs.

8. In a gas burner, a hollow head comprising two annular sheet metal elements, the first of said elements being of channel formation and including a top wall, a peripheral wall, and an inner wall, the second of said elements constituting a bottom wall having its outer edge connected to the lower edge of said peripheral wall and its inner edge joined to the lower edge of said inner wall, and a sheet metal ring-like member nested in the first mentioned element and having an annular portion engaged with and secured to said top wall and a depending peripheral wall substantially parallel to the surrounding portion of the first mentioned peripheral wall and in contact therewith adjacent the lower edge of said member, said peripheral walls being provided with gas emitting ports.

9. In a gas burner, a hollow head comprising two annular sheet metal elements, the first of said elements being of channel formation and including a substantially flat top wall, a downwardly diverging peripheral wall, and an inner wall, the second of said elements constituting a bottom wall having its outer edge connected to the lower edge of said peripheral wall and its inner edge joined to the lower edge of said inner wall, a sheet metal ring-like member nested in and secured to the first described element and having a substantially flat annular portion engaged with said top wall and a downwardly divergent peripheral wall substantially parallel to and spaced from the surrounding portion of the first mentioned peripheral wall and flared outwardly adjacent its lower edge into contact with the latter, said peripheral walls being provided with gas emitting ports.

10. In a gas burner, a hollow head comprising two annular sheet metal elements, the first of said elements being of channel formation and including a substantially flat top wall, a downwardly diverging peripheral wall, and an inner wall, the second of said elements constituting a bottom wall having its outer edge connected to the lower edge of said peripheral wall and its inner edge joined to the lower edge of said inner wall, a sheet metal ring-like member nested in the first described element and having a substantially flat annular portion engaged with said top wall and a downwardly divergent peripheral wall substantially parallel to and spaced from the surrounding portion of the first mentioned peripheral wall and flared outwardly into contact therewith adjacent the lower edge of said member, said peripheral walls being provided with gas emitting ports, the top wall and underlying portion of said ring-like member having registering apertures that are spaced apart about the head, and fastening means extending through said apertures and binding said member to the top wall.

11. In a gas burner, a hollow head comprising two annular sheet metal elements, the first of said elements being of channel formation and including a substantially fiat top wall, a downwardly diverging peripheral wall terminating at its lower end in a cylindrical portion, and an inner wall that extends generally downwardly and inwardly from the top wall, the second of said elements constituting a substantially flat bottom wall having a depending peripheral flange that fits within the lower end of said peripheral wall and is joined thereto, the inner edge of said bottom wall being connected to the lower edge portion of the aforesaid inner wall, and a sheet metal ring-like member nested in the first element and having an annular flat portion engaged with and secured to said top wall, and a downwardly divergent peripheral wall substantially parallel to and spaced from the surrounding portion of the first mentioned peripheral wall and flared outwardly at its lower end into contact with 10 the adjacent portion of said first mentioned peripheral wall, said peripheral walls being provided with gas emitting ports.

12. In a gas burner, a hollow head comprising two annular sheet metal elements, the first of said elements being of channel formation and including a substantially fiat top wall, a downwardly diverging peripheral wall terminating at its lower end in a cylindrical portion, and an inner wall that extends generally downwardly and inwardly from the top wall, the second of said elements constituting a substantially flat bottom wall having a depending peripheral flange that fits within the lower end of said peripheral wall and is joined thereto, the inner edge of said bottom wall being connected to the lower edge portion of the aforesaid inner wall, and a sheet metal ring-like member nested in the first element and having an annular fiat portion engaged with said top wall, and a downwardly divergent peripheral wall substantially parallel to and spaced from the surrounding portion of the first mentioned peripheral wall and flared outwardly at its lower end into contact with the adjacent portion of said first mentioned peripheral wall, said peripheral walls being provided with gas emitting ports, the top wall and underlying portion of said ring-like member having registering apertures that are spaced apart about the head, and fastening means extending through said apertures and securing said member to the first mentioned element.

13. In a gas burner, a hollow head comprising an outer relatively thin sheet metal shell including a flat wall portion and a peripheral wall that extends from the edge of, and entirely about, said flat wall portion and is disposed at an angle thereto, and an inner relatively thin sheet metal shell nested within the outer shell and surrounding the gas space of the burner head and having a substantially fiat wall portion engaged with said flat wall portion of the outer shell, the inner shell including a peripheral wall that extends entirely about and from the edge of its flat wall portion in substantially parallel relation to the peripheral wall of the outer shell and that is spaced a uniform distance substantially no less than its thickness from the last mentioned wall, the shells being in contact with each other entirely about the burner head adjacent the edge portion of the peripheral wall of the inner shell remote from its flat wall portion, the

spaced apart substantially parallel portions of the periph- Y eral walls of the shells being provided with gas emitting ports, the ports of one of said wall portions registering with those of the other wall portion through the intervening space, each port in the inner shell having a cross sectional area substantially equal to that of the registering port of the outer shell, the space between said peripheral walls providing a gas diflfusing chamber, and a wall disposed across and closing the open sides of the shells, the burner head having an opening for admitting a gaseous mixture to said gas space. 7

14. In a gas burner, the combination and arrangement of parts set forth in claim 13, wherein each of said shells is dish-shaped.

15. In a gas burner, the combination and arrangement of parts set forth in claim 14, wherein the edge portion of the peripheral wall of said outer shell is flared to provide an exposed flange that surrounds the burner head.

16. In a gas burner, the combination and arrangement of parts set forth in claim 14,'wherein the edge portion of the peripheral wall of the inner shell is flared to provide a flange wherewith is engaged the marginal portion of the wall that is disposed across the open sides of the shells, the edge portion of the peripheral wall of the outer shell being crimped about said marginal portion and the aforesaid flange of the inner shell and shaped adjacent thereto to conform to the corresponding portion of the inner shell.

' 17. In a gas burner, the combination and arrangement of parts set forth in claim 13, wherein each of said shells is in the form of a relatively narrow elongated pan.

18. In a gas burner, the combination and arrangement of parts set forth in claim 17, wherein the edge portion of the peripheral wall of each shell is flared to provide a flange that is in a plane substantially parallel to the plane of the fiat wall portion of the shell, the flanges of the shells being engaged with each other, and the marginal portion of the wall that is disposed across the open sides of the shells is crimped about said flanges.

19. In a gas burner, the combination and arrangement of parts set forth in claim 17, wherein the opening for admitting a gaseous mixture to the gas space of the burner head is located with its projected axis intermediate opposed side portions of the peripheral wall of the inner shell a substantial distance from each end of the burner head, and baffie parts disposed between said opening and the ports in the adjacent opposed side portions of the peripheral wall of said inner shell.

Jackson Jan. 20, 1885 Dean Nov. 8, 1892; Petersen et a1 June 27, 1905 Park May 25, 1909 Benson June 18, 1918 Torrey Aug. 30, 1921 Keith Apr. 25,1922 Bierce Jan. 20, 1925' McCoy Jan. 5, 1932 Forberg Jan. 26, 1937' Hurlbut et al Apr. 3, 1945 Pratt May 15, 1945- Bechtold May 2, 1950 FOREIGN PATENTS 1 Great Britain of 1898 Great Britain Jan. 25, 1917 Great Britain June 21, 1938 1

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