US2499707A

US2499707A - Gas range top grate and burner

Info

Publication number: US2499707A
Application number: US548253A
Authority: US
Inventors: Harry L Warren
Original assignee: Southern California Gas Co
Current assignee: Southern California Gas Co
Priority date: 1944-08-05
Filing date: 1944-08-05
Publication date: 1950-03-07
Anticipated expiration: 1967-03-07

Description

March 7, 1950 H. WARREN GAS RANGE TOP GRATE AND BURNER 2 Sheets-Sheet -l Filed Aug. 5, 1944 March 7, 1950 W R 7 2,4993%? GAS RANGE TOP GRATE AND BURNER Filed Aug. 5, 1944 2 Sheets-Sheet 2 41 k 7 &

Patented Mar. 7, 1950 UNITED STATES PATENT OFFICE GAS RANGE TOP GRATE AND BURNER Application August 5, 1944, Serial No. 548,253

'7 Claims. 1

My invention relates to gas range top grates and burners, and among the objects of my invention are:

First, to provide a gas range top grate and burner which gives improved heat distribution and operates with greater efliciency than conventional burners.

Second, to provide a gas range top grate and burner wherein the grate is in the form of a smooth flat unperforated plate which is particularly easy to clean, and which protects the burner ports from liquid which may be spilled on the range during cooking.

Third, to provide a gas range top grate and burner which affords adequate support for both large and small utensils to minimize the possibility of spilling.

Fourth, to provide a burner and top grate which is so arranged that the burner flame does not come in direct contact with the bottom or side walls of the utensils.

With the above and other objects in view as may appear hereinafter, reference is directed to the accompanying drawings, in which Fig. 1 is a plan view of a gas range incorporating my top grate and burners.

Fig. 2 is an enlarged fragmentary sectional View thereof, taken through 22 of Fig. 1.

Fig. 3 is a plan view of my top grate adapted to an otherwise conventional burner, with a portion of the top grate broken away to show the burner thereunder.

Fig. 4 is a sectional view of the top grate and burner, taken through 4-4 of Fig. 3.

Fig. 5 is a bottom view of the top grate.

My top grate and burner may be adapted to various types and styles of gas ranges. For convenience the gas range I itself is represented more or less diagrammatically. The gas range includes a top plate 2 having a suitable burner opening 3 therein. Within each burner opening is a main burner 4 which includes an annular head 5. The head 5 is hollow and defines a mixing chamber 6. The upper annular end of the head 5 is provided with upwardly and outwardly directed burner ports 1. One or more vertically disposed Venturi tubes 8 communicate with the lower annular end of the head 5. At the lower end of each Venturi tube is formed an air chamber 9 in which is positioned as gas nozzle ID. The air chamber 9 is provided with air intake ports II, the areas of which may be adjusted to regulate the primary air supply by suitable means such as an air valve I2 in the form of a ported cylindrical sleeve surrounding the air chamber 9.

Within the space formed by the main burner 4 is positioned a simmer burner I3. The upper end of the simmer burner in this modification supports a top grate I4 in the form of a flat plate of uniform thickness except for a central threaded stem I5 which screw-threads into the upper end of the simmer burner I3. The simmer burner defines with the stem I5 a mixing chamber I6 having laterally directed ports I! located above the head 5 of the main burner 4. The simmer burner I3 includes a Venturi section I8, similar to the Venturi tubes 8.

At the lower end of the Venturi section I8 is an air chamber I9 into which extends a gas nozzle 20. Air intake ports 2| are provided in the side walls of the air chamber I9 and the areas of the intake ports 2I are regulated by an air valve 22, similar to the air valve I2.

It is preferred that the top plate 2 of the range be provided with an upturned rounded rim 23 around each opening 3. An annular burner guard 24 is provided with a curved outer flange 25 which fits over the rim 23, as shown best in Fig. 2. Each burner guard 24 curves downwardly and inwardly from its outer flange and terminates in an annular gutter channel 26 located below the burner ports I and radially within the periphery of the top grate I4. The top grate is set above the burner guard 24, to provide an annular clearance space 21.

The top grate I4 provides a smooth flat easily cleaned surface upon which to set cooking vessels. The grate is large enough to support the larger vessels and provide full support for the smaller vessels. By reason of the fact that the top grate extends radially, a considerable distance beyond the burner ports I, no flame comes into direct contact with the utensils, whether large or small. The hereinbefore described structure eliminates one of the difiiculties inherent in the standard type of gas burners; namely, the problem of heat distribution at low burner input while avoiding concentration of heat at the center of the utensil. If in the conventional type of burner a simmer burner is incorporated, low burner heat input is possible but the heat is concentrated at the center of the utensil. If the simmer burner is omitted and the main burner is employed, it will be difiicult to turn it low enough to function for simmering purposes without danger of blowout; in any event the burner input is higher than desirable. Tests have shown that the heat distribution by operation of the simmer burner alone is evenly distributed over the surface of the top grate illustrated.

Both iron and brass plates have been employed to form the top grate l4 and both provide an evenly distributed heat pattern Over the entire surface.

Reference is now directed to the construction shown in Figs. 3, 4' and 5. The burner structure per se herein illustrated may be considered as conventional. That is, I have found it possible to add a top grate to a conventional burner of at least one particular styleand accomplish results which were comparable to those obtained by means of the first described structure. The burner indicated generally by 31 is commercially available. It comprises a mainconduit 32 which has two passages therein, one-terminating inan upturned simmer branch 33; and a simmer burner 34 is mounted at the extremity of the simmer branch 33.

A mainburnerbranch 35; which may be-separated from the conduit 32; but which extends upwardly from the: other passage contained in the conduit 32 anditerminatesina ringchamber 36 disposed concentrically with respect tothe simmer burner 34'. Thering chamber 355 isopen at itsupper end and is adapted tobe closed by a' cover plate 3-! having a hollow stem 38 which.

is externally threaded for connection with an internally threaded wall of the ring chamber 35.-

The outer periphery of' the cover plate 31 at its underside forms with thecorresponding sideof thering chamberxiifia series of laterally-di rectedupwardly inclined burner ports 39; A burner grate 40, incorporating the features of the top grate: l4 inthe firstldescribed structure, is mounted -on.the cover plate 37 The burner grate in this modification comprises-a top plate member 4!" havinga plurality of feet SZ-adapted to support the grate upon the burner plate 3'! and is attachedthereto by screws 43.

An annular burner'guard 2 such asshown in the above described. structure, may be pro vided under the periphery of the burner grate 40.

It should be pointed= out that the cover plate 3'! and theboss' 42 may bemadeintegral witheach' other, instead: of separated, as shown.

The operation. of" the burner grate shown in Figs. 8, 4 and fi isessentially the same as-that shown in the previously described structure; andthe advantages gained by the top grate M are likewise gained by the'burner grate 40.

Many other embodiments of the invention may be resorted to without departing from the spirit of the invention.

I claim:

1. A gas range device of the class described, comprising: a range top sheet having a burnerreceiving opening, the margins of said opening at first curving upwardly from the normal level of the top sheet to form a raised outer rim and then curving downwardly and terminating in an upturned inner rim depressed below the normal level of said range top sheet; a burner structure for said opening including an annular outer main burner and an inner simmer burner; and a utensil-supporting grate plate in the-form of a fiat unperforated disk carried by said burner structure and extending radially beyond said main burner and over the depressed margins of said opening in spaced relation therewith and into contiguous relation with said upraised outer rim to define therewith an uninterrupted annular outlet.

2.- A gas range device of the class described,

comprising: a range top sheet having a plurality of burner receiving openings, each bordered by an upwardly curved rim; an annular burner guard including an upwardly curved outer margin conforming to the marginal rim of said opening and a depressed channel bordering its inner margin and forming an upturned inner rim above said channel but below the normal surface of said top sheet; a burner unit for each burner opening, said burner unit including an annular main burner projecting above the inner rim of said burner guard'and having radially directed burner orifices, an inner simmer burner projecting above said main burner and having radially directed burner orifices; the-burner orifices of said main and simmer burner being between the planes definedby the upwardly curved outer marginal portion and upturned inner rim of said burner guard; and a utensil-supporting grate plate in the form of a fiat disk. carried by said burner structurasaid plate projecting radially beyond said main burner and: positioned above said burner guard, and terminating in spacedrelation with the outer margin: of said'burneir guard' to form an uninterrupted' annulardischarge opening for the products of combustion.

3. A gas range device of the class described, comprising: a range topsheet' having aplurality of burner receiving iopenings; each. bordered. by an' upwardly curved' rim; an annular" burner guard having an outer margin conforming to the margin of said opening. and. a: depressed inner rim depressed below the outer. rim and defining an: upwardly facing channel; a'. burner unit for each burner opening, said burner unit including an annularmain; burner-projecting above the inner rim of said burner guard andhaving radially directed burner: orifices. an innersimmer burner projecting above-said main burner andhaving radially directed. burner orifices, the burner orifices of said mainand' simmer burner being between the' planes' defined by. the upwardly curved outer marginal portion and upturned inner rim ofrsaid burnen-guard; and a utensilsupporting'grate? plate in theform of a flat disk carried by said burner-structure, said plate projecting radially beyond said main burner and positioned above said burnenguard, and terminating in' spaced relation with the-outer margin of said burner guard' to form: an uninterrupted annular discharge openingaior the products of combustion.

4. A gas'range structure comprising: a main burner of annular form-having radia ly directed burner ports; asimmer'burner extending upwardly through and spaced from the main burner, said simmer burner having radially directed burner portsdocated above'the upper end of the main burner; an imperforate grate plate mounted on said. simmer burner and extending over andbeyond the'outerperiphery of saiclmain burner in spaced relation therewith; 'an:annular burner guard ring surroundingsaid main burner and spacedfrom said' main burner and grate plate to define therewith a combustion zone; said guard ring having'an upturned inner marginal rim disposedbelow the ports of said-main burner, and an upturned outer marginal rim disposed above the level of said main burner ports and radially outward'ofa the periphery of said grate plate.

5. A gas range structure comprising? a main burner of annular form having radially directed burner ports; a simmer burnersof' relatively small diameterflextendings upwardly through, the annulus formed by the main burner and spaced from the walls thereof to define therewith an annular air passage, said simmer burner having ports directed radially outwardly over said main burner; an imperforate grate plate supported by said simmer burner and extending over and beyond the main burner in spaced relation therewith, thereby to define with the main burner a radially directed combustion zone for said simmer burner and ignition passage through which an ignition flame may travel between said burners; an annular burner guard ring surrounding said main burner and spaced from said main burner and grate plate to define therewith a combustion zone; said guard ring having an upturned inner marginal rim disposed below the ports of said main burner, and an upturned outer marginal rim disposed above the level of said main burner ports and radially outward of the periphery of said grate plate.

6. A gas range device as set forth in claim 1, wherein: said simmer burner projects above the outer burner unit and is provided with outwardly directed burner jets; and said utensil-supporting grate plate is carried by said simmer burner.

6 utensil-supporting grate plate is carried by said main'burner and defines therewith lateral apertures for escape of the products of combustion from, said simmer burner.

HARRY L. WARREN.

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

UNITED STATES PATENTS Number Name Date 527,566 Wallace Oct. 16, 1894 1,671,192 Kahn May 29, 1928 1,959,657 Chambers May 22, 1934 2,059,534 Pratt et a1 Nov. 3, 1936 2,088,652 Hobson Aug. 3, 1937 2,148,777 Schneider Feb. 28, 1939 2,166,442 Kahn July 18, 1939 2,196,339 Noe Apr. 9, 1940 2,285,278 Hennessy June 2, 1942 2,337,095 Frick Dec. 21, 1943 FOREIGN PATENTS Number Country Date 324,657 France Dec. 19, 1902 785,164 France Mar. 13, 1935 859,286 France Dec. 14, 1940