US2385413A - Gas burner - Google Patents

Description

Spt. 25, 1945. P, s, HARPER GAS BURNER Filed Feb. 12, 1941 Fizz ' ffzz" er bolted to the tubes.

Patented Sept. 25, 1945 GAS BURNER Philip S. Harper, Chicago, Ill., assignor, by direct and mesne assignments, of one-fourth to Philip S. Harper and one-fourth to Carolyn L. Harper, both of Chicago, Ill., and one-fourth to Harris Trust and Savings Bank, an Illinois banking corporation, as trustee of the Philip S. Harper Trust, and one-fourth to said Harris Trust and Harper Trust Savings Bank, as trustee of the Carolyn L.

, Application February 12, 1941, Serial No. 378,533

' 9 Claims. (Cl. 158-116) The present invention relates to burners and particularly to gas range burners of the round or ring style. It has for its primary object the provision of new and improved burners of both the single burner or the double section type, the latter of which comprises simmer and main burner sections.

Burners oi the type to which the present in" vention pertains have heretofore been of three general types in so far as their construction is concerned. All three types utilize die cast aluminum burner heads. The first type consists of an aluminum top member having teeth on its underside adapted to rest on a cast iron base formed as a part of a mixing tube, the hose thus cooperating with the teeth to form the various gas outlet ports. In this ,type the top member is secured to the base by means of a screw thread connection. A. second type of burner head is also made oi a single piece of die cast aluminum. The bottom of the burner head is substantially entirely opento provide communication with the gas inlet passages in the cast iron mixing tube upon which it is supported. The bottom is also provided with an outer flange whereby it may be The third type of burner is made of two pieces of die cast aluminum held in assembled relation in screw threads.

The first type of burner referred to has the disadvantage that it requires accurate machining of the cast iron base, which must be provided with an accurately finished surface for receiving the burner teeth of the die cast top member. Furthermore, the base must be threaded to receive the top member.

The single piece construction of the second type of burner head, comprising an outer flange, requires alargfe surface on the mixing tube. The tube thus includes additional material which adds to the weight thereoi, and dimculties are encountered in casting the tube with a fiat surface. Furthermore, a considerable number of bolts are required for satisfactorily securing the burner head to the mixing tube.

The foregoing disadvantages of the single piece construction led to the development of a burner head having a relatively small surface for contact with the mixing tube. It was iound desirable to make these burner heads in two pieces and to join them by lnterengaging screw threads, as in the-third type of construction referred to above.

This construction has the disadvantage that the cutting of the threads involves a number-of machine operations. Furthermore, in view of the requirement oi close contact between the two parts of the head, sealing rings must ordinarily be used to seal the central partition between the two :burner chambers.

It isthe primary object o! the present inventionto provide a new and improved multiplepiece burner head wherein the several pieces are readily adapted to be made by die casting, and which pieces are readily adapted to be assembled to form a burner head and are securely held in assembled relation.

A more specific object of the present invention is to provide a burner oi the type mentioned wherein the parts of the head are held in assembled relation by press fits between a plurality of cooperatively associated portions, and, furthermore, wherein the parts held together by a press fit define burner chambers.

A further object of the present invention resides in the provision of a new and improved gas burner of the type specified, wherein a plurality of press fits 'are in opposed relationship to each other, thereby to provide a more effective arrangement for holding the parts secured to each other and more effective seals between the burner chambers.

Other objects and advantages of the present invention will become more apparent from the ensuing description, in the course of which reference is hadto the accompanying drawing in which:

Fig. l is a top plan view of a burner head constructed in accordance with the present inven-- tion;

Fig. 2 is a vertical crossfsectional view along the line 2-2 of Fig. 1; v

Fig. 3 is a diametral vertical cross-sectional view of a modified form of burner head; and

Fig. 4 is a fragmentary view similar to that of Fig. 3, showing a modified form of the burner head illustrated in Fig. 3.

Referring now to Figs. 1 and 2,, the burner illustrated therein may be seen to comprise a mixing tube, indicated generally by reference character l0, and a burner head, indicated generally by reference character I2. The mixing tube is a conventional cored iron casting having therein a small mixing tube l4 and a large mixing tube 16, these tubes being substantially parallel to each other and separated at all points by a wal1 Ill. The mixing tubes are provided with openings 20 and 22, respectively, for the reception of the nozzles of a conventional double gas cock, which has not been illustrated as such cocks are well-known to those skilled in the art. The openings 20 and 22 are substantially in axial alignment with their associated tubes. The entrance end of the mixing tube is provided with air inlet openings 24 and 26, the effective sizes of which may be controlled by shutters, not shown.

The burner supporting end of the mixing tube is provided with an upstanding portion, indicated by reference character 28, provided with a pair of relatively small arcuate openings 38 and 82 communicating with mixing tubes l4 and i8, respectively. The top surface of upstanding portion 28 is cast fiat to receive the fiat arcuate base portion of the burner head, which base portion is provided with gas inlet openings 84 and 88 of a size and shape to fit over the openings 30 and 32 in the mixing tube. The burner is readily secured to the mixing tube by the useof only two bolts, not illustrated, but which extend through suitable bosses in the mixing tube into tapped openings formed in bosses 88 formed integrally with the lower of the two hereinafter mentioned parts of the burner head, the bosses being shown in Fig. 1.

The burner head of the present invention comprises top and bottom members, indicated generally by reference characters 48 and 42, respectively, secured in assembled relation by a plurality of press fits. Both members may be readily formed by a die casting or similarprocess, and they are most conveniently provided with concentric cylindrical portions enga in ach ot er with press fits, whereby the burner head may be readily assembled from the two parts and whereby the interengaging parts define the burner chambers and effectively seal these chambers from each other and from the atmosphere.

The top member 48 comprises an imperforate top wall 44 inclined at an angle of approximately 20 to the horizontal. An annular outer wall provided with a plurality of radially disposed gas outlet ports 46 to define the main burner section extends downwardly from the outer edge of the top wall 44. This annular outer wall terminates in an annular flange 48, the inner surface of which is inclined slightly for a reason which will be made apparent hereinafter. The top member also comprises an annular intermediate wall 86-, the outer surface of which, at least, is inclined in a direction opposite to that of the inner surface of flange 48. The intermediate wall terminates at its lower end in a downwardly and inwardly extending portion 52 provided with a plurality of gas outlet ports 54 extending through bosses and defining the simmer section of the burner. A downwardly extending annular flange 56, defining an inner wall, is provided at the lower end of top portion 52. The inner surface of this flange is inclined slightly in a direction opposite to the inclination of the outer surface of portion 50. The top member may also be provided with a pair of segmental webs 58 immediately above the flange 56 to give the top member additional rigidity.

The bottom member 42 comprises an annular generally upwardly and outwardly extending portion 60 terminating in an upper edge 62, the outer surface of which is inclined slightly in a direction parallel to the inclination of the inner surface of flange 48. The bottom member also comprises an intermediate annular portion 64 inclined so as to be substantially parallel with respect to the intermediate wall portion 50 of the top member. The bottom member further comprises an inner annular portion 66, the outer upper end of which is inclined to be parallel to the inner surface of flange 58.

The interengaging portions of the top and bottom members, comprising the portions JG-e2, Eli-84, and lib-88, are so dimensioned as to engage each other with a press fit, whereby the two parts are securely held in assembled relation when brought into the position in which they are indicated in Fig, 2. The lnterengaging portions mentioned not only provide a means for holding the two parts together, but these portions also define the two burner chambers and 72. The first of these communicates with the smaller mixing tube 14 through the openings 84 and 3G, and the latter with the mixing tube l8 through openings 86 and 82. The first also is open to the gas outlet ports 54 of the simmer section, while the latter is open to the gas outlet portions 38 of the main burner section.

The previously described inclination of the various interengaging parts results in a more secure assembly and more efiective sealing of the chambers from one another and from atmos-- phere. If reference be had to Fig. 2, it may be noted that the portions 52 and 84 of the bottom member 42 are forced toward each other by their press fit relationship with the portions 48 and 50 of the top member. In similar manner the portions and- 86 of the bottom member are both so forced away from each other by reason of their relationship to the portions 58 and 58 of the top member. The two parts are also more securely held to each other and also provide better seals by reason of the slight resiliency of the relatively thin interengaging parts with which the burner head parts are fabricated.

Another feature of the construction illustrated in Figs. 1 and 2 resides in the utilization of the intermediate eng ing Portions and 64 to pro- 40 vide the mainholding action. This results from the fact that the interengaging portions of these two are made relatively long as compared to the inter-engaging P rtions of the other annular walls. The relative movement of the two parts toward each other when they are pressed together is determined by engagement of abutting portions of the flange 48 of the top member and of the upper edge 82 of the bottom member. If desired, the relative movement can be fixed by dimensioning the inner walls and 88 of the top and bottom members to abut. I

The burner head may be constructed with only two press fits between the top and bottom members instead of the three illustrated in the embodiment of Figs. 1 and 2. This type of construction is illustrated in Fig. 3, wherein the two press,

fits constituted by slightly inclined interengaging portions have been illustrated by reference characters" and 18. The third press fit has been eliminated by utilizing a slotted port construction for the main burner section. The slotted port construction comprises a plurality of spacedapart teeth-like portions 80 formed at the outer peripheral underside of the top member 82 and adapted to seat on the upper edge of the outer wall 84 of the bottom member 86. The top and bottom members of the burner head of this construction illustrated may be made by a die casting or similar process and the two parts held together in-assembled relationship by the wall defining portions secured by the press fits it and I8. 4

In assembly, the two members are pressed toward each other until the teeth 80 strike the outer wall portion 84 of the bottom member.

Gas is supplied, to an inner burner chamber 88 through a port 90 and to the burner chamber 92 through a port 94. These ports are preferably arcuate in shape. The burner head of Fig. 3 is adapted to be secured to a mixing tube by means of three bolts, one extending into the opening 96 formed in a boss extending in,-

wardly from the inner wall of the bottom member and into spaced apart openings 98, only one I of which is shown, likewise formed in bosses integral with the bottom member.

In the embodiment of Fig: 4,'the central or simmer section of the bumer is illustrated as being supplied with'gas through relatively widely separated slots, indicated by reference character W0, the construction otherwise being identical with that illustrated in Fig. 3.

From the foregoing it should be evident that the present invention may be embodied in widely varying forms of gas burner heads, and when utilized, it results in a burner head which may be manufactured and assembled both readily and economically.

The burner of the present invention may have associated with it flash lighting means, whereby the gas supplied to either the simmer or .main burner sections may be ignited. Since the particular form of the flash lighting means constitutes no part of the present invention; such means has not been illustrated.

What I claim as new and desire to secure by United States Letters Patent is as follows:

1. A double section gas burner, including in combination, a top member and a bottom memher, said top member having an outer downwardly extending annular wall, an intermediate downwardly extending annular wall and an inner downwardly extending annular wall, said top member being provided with a plurality of gas outlet ports between each pair of Walls, said bottom member having an upwardly extending outer annular wall adapted to engage the outer wall of said top member with a press fit, an intermediate upwardly extending annular wall adapted to engage the intermediate wall of the top member with a press fit, and an inner upwardly extending annular wall adapted to engage the inner wall of the top member with a press fit, said inner and intermediate walls constituting together with portions of the top and bottom members a burner chamber for one section of the burner and said intermediate and outer walls constituting together with other portions of the top and bottom members a burner chamber for the other section of the burner.

2. A double section gas burner as claimed in claim 1 wherein the engaging surfaces of the innor and outer walls are inclined in the same direction relative to the vertical axis of the burner and the engaging surfaces of the intermediate walls are inclined in the opposite direction.

- tom members a annular wall defining portion, said top mem-'- her being provided with a plurality or gas outlet ports betweenthe intermediate and inner walls, said bottom member having an upwardly extending outer annular wall with its upper edge abutting against said teeth, an intermediate upwardly extending annular wall adapted to engage the intermediate wall or the top member with a press fit, and an inner upwardly extending annular wall adapted to engage the inner wall of the top member with a press fit, said inner and intermediate walls constituting, together with portions or the top and bottom members, a burner chamber for one section of the burner, and said intermediate and outer walls constituting together with other portions of the top and botsection of the 'burner, and the outer wall and said teeth and a portion of the top member constituting gas outlet ports for the other section of the burner.

5. A double section gas burner, including in combination, a top member and a bottom member, said top member having a plurality of down wardly extending radially disposed teeth extending downwardly from its outer edge, an intermediate downwardly extending annular wall and aninner downwardly extending annular portion having a plurality of radially disposed slots at its inner edge, said bottom member having an upwardly extending outer annular wall with its upper edge abutting against said teeth, an intermediate upwardly extending annular wall adapt ed to engage the intermediate wall of the top member with a press fit, and an inner upwardly extending annular wall with its upper end abutting agalnst the inner portion of the top member and engaging'the inner wall with a press fit, said inner and intermediate walls constituting together with portions of the top and bottom members a burner chamber for one section of the burner, said intermediate and outer walls constituting together with other portions of the top and bottom members a burner chamber for the other section of the burner,'the top of the outer wall of the bottom member and said teeth and a portion of the top member constituting gas outlet ports for one section of the burner, and the inner wall of the bottom member constituting together with said slots gas outlet ports for the other secion of the burner.

6. A gas burner head, including in combination, a top member and a bottom member, said top member having a plurality of radially spaced apart downwardly extending wall defining portions, said bottom member having a plurality of upwardly extending wall defining portions, the upwardly extending portions of said bottom member being radially spaced apart and dimensioned to interengage corresponding portions of the top member with a press fit, thereby to secure said top and bottom members in assembled relation by a plurality of press fit connections, and one pair of interengaging wall defining portions being continuous and in engagement over a considerable length vertically, thereby to provide the major securing action.

7., A double section gas burner, including in combination, a top member, said top member having a continuous intermediate downwardly ex-,

annular wall adapted to engage the intermediate I burner chamber for the other wall of the top member over a considerable vertical length with a press fit and an inner upwardly extending annular wall adapted to ens ae the inner wall oi the top member with a press fit, said inner and intermediate walls constituting together with portions oi the top and bottom members a burner chamber for one section oi the burner, said top and-bottom members having cooperating outer wall defining portions constituting together with said intermediate walls a burner chamber for the other section of the burner, and said top member being provided with portions defining ports through which gas may flow out of said burner chambers.

8. A gas burner head, including in combination, a top member and a bottom member, said top member having a plurality of radially spaced apart downwardly extending wall defining portions, said bottom member having a plurality of upwardly extending wail defining portions, the upwardly extending portions of said bottom memher being radially spaced apart and dimensioned to interengage corresponding portions of the top member with a press fit, thereby to secure said top and bottom members in assembled relation,

, burner.

one pair of interengaging wall defining portions being continuous and in engagement over a considerable length vertically, thereby to provide the major securing action, the pairs of interengaging wall defining portions being inclined in opposite directions relative to the vertical axis of the 9. A gas burner head, including in combination, a top member and a bottom member, said top member having a plurality of radially spaced apart downwardly extending wall defining portions, said bottom member having a plurality of upwardly extending wall defining portions, the

upwardly extending portions of said bottom memher being radially spaced apart and dimensioned to interengage corresponding portions of the top member with a press fit, thereby to secure said top and bottom members in assembled relation and to provide spaced apart burner chambers, and the interengaging surfaces of alternate pairs of said wall defining portions being inclined in opposite directions relative to the vertical axis of the burner.

PHILIP S. HARPER.

Images