US2574153A - Combination baking and broiling gas burner - Google Patents

Description

Nov. 6, 1951 R. H. MEINERS COMBINATION BAKING AND BROILING GAS BURNER 2 SHEETS-SHEET 1 Filed April 5, 1945 INVENTOR.

RICHARD H. MEIN RS.

ATTo'NEY.

Nov. 6, 1951 R. H. MEINERS 2,574,153

COMBINATION BAKING AND BROILING GAS BURNER Filed April 5, 1945 2 SHEETSSHEET 2 INVENTOR.

RICHARD H. MEINERS.

BY J

" T TORNEY.

Patented Nov. 6, 1951 UNITED STATES PATENT OFFICE.

Richard H.1VIeiners, Milwaukee, Wis., assi'gnor to A. J. 'Lirrdemann & Hovers'on Gompany, Milwaukee', Wis., a corporation of Wisconsin Application April 5, 1945; Seri'alINO. 586 709 6 Claims; (01. 158299)- The improvements relate to gas burners and primarily to burners for use in cooking. ovens adapted to be employed for baking, pruning; roasting and other cooking-operations. They are; however, usable in other burners.

Among the objects of the improvementsare to produce a light, strong and simple burner of the character indicated; to reduce the manufacturingcost of thesame in material, labor, manufacturing operations and overhead; to economize the consumption of fuel thereby and increase its heat producing eificiency, and to adapt it for use either as a single baking and br'oiling burner, located in the lower part of the oven, or as two duplicate burners mounted in the upper and lower oven the upper to be employed for broiling and similar operations and the lower for baking, roasting, etc., the burner being so constructed that it will serve both purposes.

Other objects and advantages will be apparent to those skilled in the art from the following description and the accompanying drawings which illustrate an exemplary embodiment of the improvements, and in which:

Fig. l is a plan of the burner with the upper half broken away at the front end of the venturi to expose the fuel supply and mixing valve construction shown in horizontal medial section;'

Fig. 2 is a longitudinal side elevation of the burner; d I

Fig. 3 is an end view of the fuel supply'cohdu'it and the mixing valve cap;

Fig. 4 is an end elevation of the burner proper and Fig. 5 is a vertical section of the same substantially on the line 55 of Fig. l.

The entire burner construction, including'venturi and Bunsen mixing valve chamber is formed of two substantailly duplicate halves except for the positioning means and the connecting parts between the combustion jet supporting ports and these two halves are made of sheet metal stamped by suitable dies into the desired form and size, so that they can be fitted together and secured to form the complete burner accurate in every detail without measurement, finishing work or any tools or appliances, and when so assembled will constitute a relatively light, strong and highly efii-' cient article.

Referring to the said drawings, I is the upper member or half and 2 the lower member. The upper member has an aperture 3 located centrally of the burner proper and the lower a boss 4 fitting the same while the longitudinal horizontal flange 6 of the venturi or mixed fuel supply" conduit section 5 of the upper has a like aperture 1 and the similar section8 of the lower has a boss 9 on its flange It! fitting the same. This arrangement permits the two members to be brought together and accurately positioned for welding together and forming the finished burner.

The upper member around its peripheralflange 6" at the burner proper has a series of depressions with fiat bottoms ll spaced about36 apart and 2 these rest on the peripheral flange m" of the nwermemher leaving spaces [2' between the two flanges; forming" srots which provide the comb'ustion' supporting ports" of the burner in cornmuhicatich with the fiiel distributing charmer ['3 between the annular bulged portions Ill and I5 of upper and lower members respectively.

After the two members are placed together they are united by s ot welding through the bottoms of the depressions H and the flange H1" and the; longitudinal flanges 6" and H), as indi- C'atd" at .15} and the fabrication of the burner is complete;

The length and width ofthe slots |;2- ha es definite relation to the width a'nd spacing of the depressions ll since it is very desirable that a substantially unbroken ring of combustion shall be maintained around the burner for satisfactory results). and it has been found that the slots should he more thandouble the width of the depressions and should be about 3; inchin width. 3111; theinterruptions in the slot portsf'ormed by depressions sho'uld he not mere than ln 8 1l in order to have the jets of combustion overlapthem and merge to'forni a continuous ring of flame at h'al'f or full fuel" valv'openifig. Slots 1 inches in length aha hi h mtr'rup an have been found satisfactory. The width of the slots can be accurately gauged by fixing the portions of the dies bywhicli the depressions ll are formed to" produce the desired spacing betweenthe upper and lower members at the slots and this width can be varied only slight changes in the dies, as for'ju'se with atural or refined 01-1 well casing or othergas, at will. It has been found also thatwi th this burner" construction the res sure variations in thegas mains are well taken care of. Asmost'oven burners are under'thermo static control it is impdrrahti that the burners shall be fully responsive to' normal as well as abnormal variations inpressure; v I v The fuel distributing channel t3 is flattened at its top and gradiially reduced in areatoward theportion farthest from the venturi inlet as indicated at f6, so as to prevent" the-lossof pressure at that v p'art by" the" venting of the gas be-' tween it and the veiituri tube and a consequent uneven flame or a fail'ure of the flametheh under low gas supply. By providing this reduction at the top of chanhel and above the orifices [2 the gaseous fuel isdirbtd towardtheseports" and aneven supply of fuel throughout'the cir cumferehqe of tlieurner hea-d' is" insured.

It will be noted that the flange 6 of the u per member at-the ports: [2 extends beyond the outer edge of the flange H1 and that the two flanges are downwardly inclined. This not only' prdvi'des a' ve ih 'which th f-l'lel' willb Held? for quick 11 iii-g and for even combustion at low valve pressu e all ar'oiihdthe burner but shields the ombustion against up amdown drafts by deflecting the" air away from the or'ific'e' It also d'ir'e'cts th jets of the flamedowm war'dly andspreads it laterallyandedownwardly to some extent, so that when the burner is used for broiling it will project the flame properly and when it is used for baking it will be retarded to a certain extent and diffused before passing to the oven above. In this manner the burner is adapted to be used both as a broiling and a baking burner and will dispense with the use of an upper broiling burner. It is therefore in efiect a two-purpose burner. The central portion H, I8 of the burner head is closed and consists of a flat plate or diaphragm composed of the two central plates of the complemental members, surrounded by the annular fuel distributing conduit l3 and preventing the passage of air or combustion products through the interior. The aperture 3 in the disk portion l1 and the boss 4 in the disk portion l8 are located in the exact center of their respective members, and fit together snugly, so that the outer edges of the flanges 6 and III as well as the other parts in radial relation thereto are accurately positioned.

When the burner is used as a top burner for frying, boiling and other purposes, the flanges forming the combustion supporting slots may be disposed horizontally or turned upwardly to a cer tain degree, and other orifices for the distributing channel may be provided. The structure and methods and materials used in producing it, however, will be the same.

The mixing chamber is formed by the duplicate recesses l9 and 20 of the members and 2 provided with air admission slots l9 and 20 respectively controlled by a rotatable cap 2| fitted on the exterior of the chamber thus formed and provided with recesses 2| adapted to register with said slots or partly close the same according to the position to which the cap 2| is rotated. This cap 2| is secured over the end of the chamber by a set screw 22 passed through the curved slot 2| of the cap and threaded into the end of the portion 20. The portions of the cap around opening 29 in the chamber are turned inwardly as shown at 30 to form a ring in which the tubular valve seat member 24 is fitted.

The controlled inlet for gas fuel comprises this tubular valve seat member 24 having a rotating nut 25 on its outer end, the valve plug member 26 extending therethrough and normally into proximity to the valve seat 21 and the gas supply tube 28 on the exterior of which the tubular part 24 is threaded. The valve plug member is fixed in the gas supply tube 28 and extends centrally through its portion 28', on which part 24 is threaded, having at its inner end a conical plug 26, which by being made to approach or recede from the seat 21 will regulate the amount of gas admitted to the mixing chamber surrounding it and extending into the venturi 5.

The spot weldings indicated at :1: along the flanges 6, l0, 6 and I, and located in the depressions H of 6', may be varied in number as may be required or found advisable to secure a tight joint between the two sections, and line welding may be employed to unite the flanges 6 and I0. These latter flanges terminate at the chamber portion I9, 20, so that the said portion presents a smooth exterior on which the cap 2| is snugly fitted. The central aperture 3 and boss 4 of the burner head in cooperation with the aperture 1 and boss 9 of the flanges 6 and HI have been found suflicient to position the two warping and give added strength to the structure. Other variations in details of construction may be made without departing from the invention. The term loop-shaped in the appended claims is not limited to a round or rounded loop.

The combination of the closed interior of the burner head and the peculiar formation of the flange forming the combustion supporting orifices produces an important result, in addition to insuring absolute accuracy in these parts, due to the fact that all unheated air passing upward from below the burner must pass around these orifices. through the combustion issuing therefrom laterally and downwardly and become mingled with the highly heated products of combustion. The downward inclination of the upper portion of the fuel distributing channel is also of importance and has been found to have a peculiar effect in connection with the form and location of the orifices and the specific gravity of the fuel. There are also other peculiar functions and advantages of the construction and arrangement shown and which the elements specified in the claims cooperate to produce.

What I claim is:

l. A combined baking and broiling oven gas burner comprising two substantially horizontal and coextensive sections secured together face to face and made of stamped sheet metal having opposed complemental upper and lower recesses forming between them an air and gaseous fuel admission and mixing chamber, a Venturi tube extending therefrom and in communication therewith at one end and a loop-shaped mixed fuel supply and distributing channel in communication with the opposite end of said tube, said channel being tapered from proximity to said tube to its portion farthest removed therefrom by an inclined flattened top of the upper channel forming recess to equalize pressure in said channel, peripheral downwardly inclined flanges on said sections surrounding said channel sections accurately, but additional connections forming recesses, at least one of the sections having spaced downward projecting portions in its said flange around its channel forming recess and between said recess and the flange periphery, the latter being substantially parallel with said recess, the said flange of the other section being in contact with said projections whereby points of securement and fuel port slots between them are formed, and the upper of said flanges extending well beyond the periphery of said lower flange and overhanging the orifices of said slots whereby the said slots are protected against up and down drafts and the fuel issuing therefrom is given an outward and downward direction when under relatively high pressure and under lower pressure is distributed laterally t fill the space around the burner evenly under all pressures.

2. A combined baking and broiling oven gas burner comprising two substantially horizontal and coextensive sections secured together face to face and made of stamped sheet metal having opposed complemental upper and lower recesses forming between them an air and gaseous fuel admission and mixing chamber, a Venturi tube extending therefrom and in communication therewith at one end and a loop-shaped mixed fuel supply and distributing channel in communication with the opposite end f said tube, peripheral flanges on said members surrounding said channel forming recesses, at least one of the sections having spaced projecting portions in its said flange around its channel forming recess and between said recess and its periphery the latter being substantially parallel with said recess, the said flange of the other section being in contact with said projections whereby points of securement and fuel port slots between them are formed, and the upper of said flanges extending downwardly and well beyond the periphery of said lower flange and overhanging the orifices of said slots whereby the said slots are protected against up and down drafts and the fuel issuing therefrom is given an outward and downward direction when under relatively high pressure and under lower pressure is distributed laterally to fill the space around the burner evenly under all pressures, the said spaced downward projections being of relatively narrow width with respect to the length of the slots and welded to the contacting flange portion.

3. A combined baking and broiling oven gas burner comprising two substantially horizontal and coextensive sections secured together face to face and made of stamped sheet metal having opposed complemental upper and lower recesses forming between them an air and gaseous fuel admission and mixing chamber, a Venturi tube extending therefrom and in communication therewith at one end and a loop-shaped mixed fuel supply and distributing channel in communication with the opposite end of said tube, peripheral flanges on said sections extending from the Venturi forming recesses in contact and welded together and other peripheral flange surrounding said channel forming recesses, at least one of the sections having spaced projecting portions in its said flange around its channel forming recess and between said recess and its periphery the latter being substantially parallel with said recess, the said flange of the other recess being in contact with said projections, whereby points of securement and fuel port slots between the members are formed, the upper of said flanges extending downwardly and well beyond the periphery of said lower flange and overhanging the orifices of said slots whereby the said slots are protected against up and down drafts and the fuel issuing therefrom is given a lateral direction, all of said members being formed by the said two sections and the parts forming them being integral with their respective sections.

4. An oven gas burner comprising two substantially horizontal and coextensive sections secured together face to face and made of stamped sheet metal having opposed complemental upper and lower recesses forming between them an air and gaseous fuel admission and mixing chamber, Venturi tube extending therefrom and in communication therewith at one end and a loop-shaped mixed fuel supply and distributing channel in communication with the opposite end of said tube, peripheral flanges on said sections on both sides of said Venturi tube and surrounding said channel forming recesses in contact each with the flange opposite and welded thereto one of said nanges being spaced from the other at intervals around its channel forming recess, whereby iuei port slots between it and the opposite flange are formed, each of said members being an integral piece of sheet metal and each having a 018K surrounded by said loop-shaped channel in radial contact with the dish of the other, a central pro ection on one disk and an a ei cure Pi'OvlLiBCl in the other of a size to reeerie and enga e said projection, whereby the sections are positioned and aligned.

5. 1-1 gas burner comprising two substantially horizontal and coextensive sections secured together and made of stamped sheet metal having opposed complemental recesses forming between them a Venturi tube and a loop-shaped mixed fuel supply and distributing channel in communication with the inner end of said tube, peripheral laterally extending flanges on said sections surrounding said channel forming recesses, spaced circumferential projecting portions on at least one of the said flanges between said recess and its periphery, the said flange of the other being in contact with said projctions and welded thereto, whereby separated fuel port slots between the flanges are formed, and one of said flanges extending downwardly and well beyond the periphery of the other flange and the orifices of said slots whereby the said slots are protected against up and down drafts and the fuel issuing therefrom is given an outward and oblique direction, the spaced projections being of relatively narrow width with respect to the circumferential length of the slots each of which extends from one projection to the next and has its vertical Width fixed by the vertical extent of said projections.

6. An oven gas burner comprising two substantialy horizontal and coextensive sections secured together face to face and made of stamped sheet metal having opposed complemental upper and lower recesses therein forming between them, a mixed fuel supply conduit in communication with a source of fuel gas and air at one of its ends, a continuous mixed fuel distributing channel in communication with the opposite end of said tube and surrounding a rigid central portion, flat radially contacting parts of said sections comprising said central portion, peripheral flanges on said members surrounding said channel forming recesses each in contact with the opposite flange and secured thereto, one of said flanges being spaced from the other at intervals and united with the other at intervening intervals around its channel forming recess, whereby fuel ports slots between it and the opposite flange at least partly guaged and secured by said flat parts are formed and air rising from beneath the burner is directed over the orifices of said ports.

RICHARD H. MEINERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 377,547 Daniels Feb. 7, 1888 562,410 Moon June 23, 1896 623,518 Crook Apr. 25, 1899 969,021 Wulfeck Aug. 30, 1910 1,486,668 Kielberg Mar. 11, 1924 1,488,677 Hoffman Apr. 1, 1924 1,602,206 Possons Oct. 5, 1926 1,837,549 Herwig Dec. 22, 1931 2,074,531 Becvar Mar. 23, 1937 2,348,011 Koppel May 2, 1944 2,372,953 Hurlbut, et al Apr. 3, 1945 2,386,978 Ruhl Oct. 16, 1945 2,396,800 Mills Mar. 19, 1946 2,454,229 Sparrow Nov. ,16, 1948 FOREIGN PATENTS Number Country Date 8,625 Great Britain of 1886 210,301 Great Britain Jan. 31, 1924 487,445 Great Britain June 21, 1938

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