US2560777A - Sheet-metal oven gas burner - Google Patents

Description

July 17, 1951 H. M. REEVES ,5

SHEET METAL OVEN GAS BURNER Filed Jan. 26, 1945 2 Sheets-Sheet 1 July 17, 1951 H. M. REEVES SHEET METAL OVEN GAS BURNER 2 Sheets-Sheet 2 Filed Jan. 26, 1945 Patented July 17, 1951 SHEET-METAL OVEN GAS BURNER Herbert M. Reeves,

Kankakee, 11]., asslgnor to Florence Stove Company, Gardner, Mesa, a corporation 01' Massachusetts Application January 26, 1945, Serial No. 574,740

6 Claims. 1

The invention relates generally to burners for gaseous fuel cook stoves and more particularly to an improved burner especially suited for stove ovens, broilers and the like.

One object of the invention is to provide a burner of the above general character which is light in weight, efllcient, durable, and relatively inexpensive to produce 4 A more specific object is to provide an improved oven burner constructed substantially entirely of sheet metal parts adapted to be produced by simple stamping operations and at a much lower cost than conventional cast metal burners.

Another object is to provide a sheet metal oven burners in durability and performance.

Still another object is to provide a sheet'metal oven burner capable of functioning economically and efiiciently under all conditions normally encountered in the operation of gaseous fuel cook stoves from baking operations or the like requiring relatively low heat to broiling operations requiring maximum heat.

Another object is to provide a sheet metal burner having a novel arrangement of ports adapted to distribute the heat produced under high fire conditions uniformly over a relatively large area and capable of maintaining a stable flame under low fire conditions.

A further object is to provide novel means burner which is equal or superior to cast metal for insuring proper ignition of a. burner having groups of ports spaced from each other.

It is also an object of the invention to provide a sheet metal burner constructed and arranged in a novel manner to direct the flame from the burner ports for most eflicient operation and to effectually prevent obstruction of the ports by foreign material falling upon the burner.

Other objects and advantages of the invention will become apparent from the following detailed description of the preferred embodiment illustrated in the accompanying drawings in which:

Figure 1 is a perspective view of a burner embodying the features of the invention.

Fig. 2 is a fragmentary side elevational view of the burner.

Fig. 3 is an enlarged fragmentary perspective view of the head portion of the burner showing the form and relationship of the main elements entering into the construction of the burner.

Fig. 4 is a sectional view taken in a vertical plane substantially on the line 4-4 of Fig. 2.

' Fig. 5 is a vertical sectional view through one 2 corner of the burner head taken in a plane substantially on the line 5-5 of Fig. 1.

Fig. 6 is a transverse sectional view through the mixing tube end of the burner taken in a vertical plane substantially on the line 6-8 of Fig. 1.

Fig. 'l is a horizontal sectional view taken through said one corner of the burner head in a plane substantially on the line 1-1 of Fig. 5.

While the invention is susceptible of various modifications and alternative constructions, I have shown in the drawings and will herein describe in detail the-preferred embodiment, but it is to be understood that I. do not thereby intend to limit the invention to the specific form disclosed, but intend to cover all modifications and alternative constructions falling within the spirit and scope of the invention as expressed in the appended claims.

By way of illustration, the improved burner has been shown as comprising an elongated, generally rectangular burner head l0 having groups of burner ports I I (Figs. 1 and 2) extending along opposite sides and along one end. A gaseous fuel and air mixture is supplied to the head through a Venturi-shaped mixing tube l2 communicating with the other end of the head and, in this instance, disposed substantially at a right angle thereto. It will be understood, of course,

that the burner head and mixing tube may be formed as separate parts if desired and that the shape of those parts and their relationship may be varied to meet the particular requirements of the stove in which the burner is to be installed.

In accordance with the present invention, the burner is constructed substantially entirely of sheet metal parts adapted to be produced by simple, relatively inexpensive manufacturing processes such as die forming or stamping operations. The use of sheet metal materially reduces the weight of the burner as compared to conventional cast metal burners thus facilitating the handling of the parts in the manufacturing processes and eflecting substantial savings in shipping charges. As herein shown, the burner comprises a, pair of complemental sheet metal stampings I3 and I4 adapted when assembled in superimposed relation to define the mixing tube I 2 .and the burner head It. A reinforcing member l5 of heavy gauge sheet metal and an elongated burner supporting bar it are mounted on the head portion of the burner and are rigidly secured to the members It and It by rivets II or the like.

Referring to Figs. 1 and 3 of the drawings, the

members or stampings l3 and II, constitute respectively the lower and upper members of the burner. Each member comprises a tube forming section |3a angularly related to a head forming section Ha both generally channel-shaped in cross section. The sections |3a defining the mixing tube |2 taper gradually toward their free ends and terminate in enlargements 2|] and 2| to form an air and gas inlet chamber. At their extreme ends, the members l3 and H are suitably shaped to provide a generally circular gas inlet opening chamber. The enlargement is also formed to provide an air inlet opening to the chamber. which may be fitted with the usual pivoted shutter 23 for controlling the air supply to the burner.

As will be seen by reference to Figs. 1 and 6, the tube forming sections |3a of the members l3 and H are provided with registering outwardly turned marginal flanges 24 and 25. The members may be rigidly secured together by spot welding these flanges or by crimping one of the flanges over the other as shown in Fig. 6 so as to provide a gas tight joint therebetween.

The head forming sections Ma of the members l3 and M are shaped to define an elongated, generally rectangular distribution chamber (Figs. 3 and 5) coextensive with the head In and opening at one end to the mixing tube l2. The lower member I3 is preferably formed with relatively deep side walls 3| having a continuous outturned marginal flange 32 extending along opposite sides and around one end. The flange is preferably bent downwardly at an angle to the side walls 3| except for short sections 32' on opposite sides adjacent the mixing tube which are disposed substantially at right angles to the side walls as shown in Figs. 1 and 3.

The head portion of the upper burner member I4 is preferably formed with side and end walls or flanges 33 adapted to extend over the flange 32 and disposed substantially parallel thereto. Adjacent the mixing tube section of the member, the flanges 33 merge into a horizontal flange portion 34 adapted to register with the flange 32'- of the lower member I3. A channel-shaped depression 35 stamped in one of the flanges 34 defines a lighter port opening from the distribution chamber 30 and adapted to cooperate with the usual flash tube provided in gaseous fuel cook stoves.

Oven burners installed in conventional cook stoves are required to operate under widely varying conditions. Thus for broiling and similar high temperature operations, the heat produced by the burner must be distributed uniformly over a relatively large area. At the same time, ,the total port area must be kept within predetermined limits in order to maintain a stable flame on low fire when the oven is used for low temperature baking or the like. In accordance with the invention, these widely varying requirements are effectually met by providing the burner with a plurality of well spaced ports accurately formed to uniform dimensions. I

In the exemplary burner, the ports H are deflned by the flanges 32 and 33 of the burner members l3 and M. For this purpose, one of the flanges, in this instance, the upper flange 33, is formed with a series of transverse generally semi-cylindrical indentations or corrugations 36 which coact with the adjacent flat surface of the companion flange 32 to define the burner ports. To maintain total port area within the required 22 at the end of the air and gas.

limits, the corrugations are formed on relatively small diameters, the dimensions being such as to provide ample port capacity for maximum heat requirements and yet produce a stable flame at low flre level. Moreover, the ports thus formed are of substantial length, thus insuring against flash back either at low flre or when the burner is turned off.

An important advantage in forming the burner ports in the manner contemplated by the present invention is that the upper burner, member I4 may be of light gauge sheet metal, preferably of a heat resisting type such as chrome steel, in which the corrugations 36 may be readily stamped with the accuracy and uniformity necessary to produce a practical burner. The strength and rigidity required for the burner assembly is obtained by forming the lower burner member l3 of heavy gauge sheet metal and by the further provision of the reinforcing member I5. The two latter members are simple in form and may be stamped from heavy gauge sheet metal without difliculty. Moreover, they are not subject to excessive heat and may therefore be made from a relatively inexpensive grade of steel.

As herein shown, the corrugations 36 are formed along opposite side portions and the end portion of the flange 33 thus presenting outwardly facing groups of ports along two sides and one end of the burner head In. The corrugations of each group are suitably spaced apart so as to provide the optimum spacing between ports for even heat distribution. Due to the angular disposition of the flanges 32 and 33, the ports are directed outwardly and downwardly so as to produce a flame especially suited for broiling. It will be understood, however, that the disposition of the ports with respect to the burner head may be varied to meet the requirements of the particular oven in which the burner is to be installed.

As explained above, the corrugations 36 are provided in the two opposite side portions and in the end portion of the flange 33, thus producing three separate groups of burner ports |l facing outwardly at the sides and oneend of the burner head II].- To insure proper ignition of all burner ports, the space between each such group is bridged by a wide flame carrying port 31 (Figs. 5 and 7). The ports 31 in this instance are located at the corners of the burner head and are formed by the corner portions of the flanges '32 and 33 which are held in spaced relation by nibs 38 embossed in the upper flange 33 and adapted to bear against the lower flange 32 as shown in Fig. 5.

Means is provided for protecting the flame issuing from the burner ports from drafts and for preventing obstruction of the ports by foreign material falling on the burner. For this purpose, the outer edge portion of the flange 33 is bent upwardly and outwardly as at 40 so as to provide an overhanging cave-like guard for the burner ports. As a practical consideration, it has been found desirable to construct the upper burner member ll of chrome steel or similar metal capable of withstanding the high temperatures to which the guard flange is subjected, particularly in low fire operation where the fuel burns relatively close to the outlets of the ports Referring to Fig. 1 of the drawings, the reinforcing member |5 is in the form of a flat metal plate having depending flanges along opposite sides and one end adapted to closely overlie the member l4 and the corrugated flange 33 thereof.

.to engage the conventional The supporting bar It is preferably spot welded to the reinforcing member I! to strengthen the assembly and the several parts of the burner are permanently secured together by the rivets I! as explained heretofore. Spacing sleeves 45 encircling the rivets and interposed between the members l3 and I4 serve to maintain them rigidly flxed in the desired relationship. Support for the burner assembly is provided by the bar l6 which is formed at opposite ends with oppositely disposed hook portions 46 and 41 adapted burner supporting structure of the stove.

It will be apparent from the foregoing that the invention provides an oven burner of novel and advantageous construction particularly suit able for gaseous fuel cook'stoves. burner is inexpensive to manufacture since it may be constructed entirely of sheet metal parts produced by simple die forming or stamping operations. The parts required are few in number, there being two main parts or stampings which cooperate to define the fuel and air mixing tube and the burner head. Elements of the main burner members, in this instance, integrally formed flanges, coact to define the burner ports. The accuracy and uniformity of the ports is determined solely by the form of one of the burner members which can thus be made from light gauge sheet metal to facilitate production of such members by ordinary stamping operations. Strength and rigidity is provided by the companion member which, by reason of its simple form may be stamped from heavier gauge sheet metal.

The burner ports are advantageously spaced and directed so as to distribute the heat produced uniformly over a relatively large area, thus making the burner particularly suitable for high temperature broiling operations. Moreover, the ports are shaped and dimensioned so as to maintain a stable flame under low fire operation thus enabling the burner to function efficiently for low temperature baking operations. Proper ignition of the burner is insured by a novel built-in lighter port together with novel flame carrying ports between the groups of burner ports at the sides and end of the burner head. In general, the improved burner is inexpensive to produce, light in weight, and equal or superior to conventional cast metal burners in performance and durability.

I claim as my invention:

1. An oven burner for gaseous fuel cook stoves comprising, in combination, a pair of complemental sheet metal members of generally channel-shaped cross section assembled in superimposed relation to define an elongated distribution chamber, the upper one of said members being formed of light gauge heat resisting metal,- regis tering marginal flanges formed on the respective members spaced apart to define burner ports opening from said distribution chamber, and a heavy gauge sheet metal member generally similar in cross section to and overlying said one member in closely fitting relation to reinforce the same.

2. A gaseous fuel oven burner comprising, in combination, a pair of complemental sheet metal members of generally channel-shaped cross section assembled in superimposed relation to define a fuel distribution chamber, an outwardly and downwardly turned marginal flange on the lower one of said members, a marginal flange on the upper one of said members overlying said first mentioned flange and having its outer edge por- The improved tion extending substantially beyond the same, and l indentations extending across the flange of said upper member and terminating inwardly of said edge portion operative in coaction with the flange of said lower member to-deflne a series of burner ports opening from said distribution chamber,

said edge portion of said flange being turned upwardly and outwardly to form a guard for saidv burner ports.

3. In a gas oven burner, in combination, a pair of complementally shaped sheet metal members assembled in superimposed relation to define an elongated straight distribution chamber and-.a

fuel and air-mixing passage communicating therewith, registering flanges formed on the side edges of said members, the flanges on said upper member having corrugations formed therein for coaction with the flanges of the lower member to define burner ports opening from said distribution chamber, said upper member being constructed of sheet metal resistant to the heat of the burner of a relatively light gauge to facilitate formation of said corrugations by die stamping, a member of heavy-gauge sheet metal overlying said light-gauge upper member to impart rigidity to the burner, and means securing said heavygauge member to the lower burner member to produce a rigid burner structure.

4. An oven burner for gaseous fuel cook stoves comprising, in combination, a pair of complemental sheet metal members assembled in superimposed relation to define an elongated generally rectangular fuel distribution chamber, an outwardly and downwardly turned flange extending along two sides and around one end of the lower of said members, a flange extending along two sides and around one end of the upper of said members and overlying said first-mentioned'flange, at least one of said flanges being formed with a plurality of transverse indentations defining burner ports opening from said distribution chamber at the sides and said one end thereof, the marginal edge portion of said second-mentioned flange extending beyond the outer ends of the burner ports and being turned upwardly to form a guard'for the ports.

5. An oven burner for gaseous fuel cook stoves comprising, in combination, a pair of complemental sheet metal members assembled in superimposed relation to define an elongated generally rectangular distribution chamber, downwardly and outwardly turned registering marginal flanges extending along both sides and around one of the ends of said members, and a series of transverse corrugations formed in each side portion and in the end portion of one of said flanges and operative jointly with the other flange to form groups of burner ports directed respectively laterally and longitudinally of the burner, the corner portions of said flanges being free of corrugations and spaced apart to define narrow flame-carrying ports connecting adjacent groups of burner ports.

6. An oven burner for gaseous fuel cook stoves comprising, in combination, a pair of complemental sheet metal members assembled in superimposed relation to define an elongated generally rectangular distribution chamber, registering marginal flanges extending along both sides and around one end of each member, said flanges projecting downwardly and outwardly with reference to said chamber and at least one flange having transverse corrugations cooperating with the other flange to define burner ports opening from the chamber, a sheet metal reinforcing member overlying the upper member of said pair in faceto-face engagementtherewith, and means securing. said members together in a unitary structure. HERBERT M. REEVES.

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

UNITED s'ra'ms PATENTS Number Name 1 Date 832,879 Roy Oct. 9, 1906 969,021 Wulfeck Aug. 30, 1910 1,675,899 Methudy July 3, 1928 2,186,607 Judge et a1 Jan. 9, 1940 Number Number

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