US2486278A - Gas burner having removable cap structures - Google Patents

Description

Oct. 25, 1949. P, s, HAPER 2,486,278

GASv BURNER HAVING REMOVABLE CAP STRUCTURES Filed April 28, 1944 2 Sheets-Sheet l [f4 Y 20 00000 "ooooooogm I Oct. 25, 1949. P. s. HARPER 485,278

GAS BURNER HAVING REMOVABLE CAP STRUCTURES Filed April 28, 1944 2 sheets-sheet 2 Eatented Oct. 25, 1949 GAS BURNER HAVING REMVABLE CAP STRUCTURES Philip S. Harper, Chicago, Ill., assignor to Harper- Wyman Company, Chicago, Ill., a corporation of Illinois Application April 28, 1944, Serial N0. 533,159

19 Claims. (Cl. 158-116) The present invention relates to gas burners and particularly to burners of the type comprising detachably secured base and cap portions.

In the past, domestic gas range burners comprising base and cap or head portions have been held in assembled relation in various ways. Intertting screw threads have been used, as have been bolts and other means. However, none of these arrangements has produced a burner cap which could be readily removed for cleaning.

Screw threads invariably freeze as a result of alternate heating and cooling of the burner portions. Bolted constructions require the use of screw drivers or wrenches, are diicult to get at, and require considerable time for removal.

An improved gas burner construction, including fastening or securing means enabling the burner cap to be fastened to the base portion easily and also enabling it quickly to be detached for cleaning or other purposes, is disclosed in the copending application of myself and another Serial No. 379,618, filed February 19, 1941, which matured as Patent No. 2,386,113 on October 2, 1945. In the construction disclosed and claimed in this application, the cap and base portions are provided with cooperatively associated interengaging structure, whereby the head may be inserted into the base and then rotated a part turn to lock it in place.

The present invention has for its primary object a new and improved gas burner having securing means of the type including interengaging structure on the base and cap.

A further object of the present invention is the provision of a new and improved gas burner comprising detachable parts wherein the securing means requires no screws or bolts, and which requires only a few parts and can be manufactured readily.

A further object of the present invention is to provide a new and improved gas burner of the character aforesaid, wherein the securing means is of the bayonet Atype and of a character wherein "jamming of the fastening means is minimized, the cap may be moved through a greater vertical distance relative to the base, and which can be manufactured from thin, light material.

Another object of the present invention is the provision of Va new and improved gas burner including a burner base having an annular upwardly extending outer wall with spaced apart inward projections, a burner cap having a central dependent portion located centrally of the wall. and a securing member fastened to the dependent portion of the cap having opposed portions to engage the undersides of said projections, whereby the base and cap may be readily secured together and detached by relative rotation thereof.

Another object of the present invention is to provide a new and improved gas burner of the character set forth in the preceding paragraph, wherein the securing member is xedly fastened to the cap and is made of material which can yield or bend somewhat if occasion demands when the cap and base are assembled.

Another object of the present invention is to provide a new and improved gasV burner of the character set forth in the second preceding paragraph wherein the securing member is pivotally secured to the cap member.

Other objects and .advantages of the present invention will become apparent from the ensuing description, in the course of which reference is had to the accompanying drawings, in which:

Fig. 1 is a side elevation of one embodiment of a gas burner constructed in accordance with the present invention;

Fig. 2 is a top plan view, of the burner shown in Fig. 1;

Fig. 3 is a vertical cross-sectional view taken along the line 3-3 of Fig. 2;

Fig. 4 is a vertical cross-sectional view of the burner taken along the line 4 4 of Fig. 2;

Fig. 5 is a View similar to Fig. 2 of another embodiment of the present invention;

Figs. 6 and 7 are side elevational and crosssectional views of the fastening member utilized in the burner shown in Fig. 5, Fig. 6 being a View looking in the direction 6 6 of Fig. 5 and Fig.` 7 a view taken along the line I-'l of Fig. 5.

As heretofore indicated, the present invention partly broken away,

pertains particularly to the fastening means whereby the cap and base portions of the gas burner are detachably securedl together. The fastening means may be utilized in various types of gas burners and in the instant case it has been illustrated in conjunction with a gas burner I0 comprising two parts, a base I 2 and a cap or head I4 which are constructed in a manner disclosed and claimed in my copendlng application Serial No. 522,745, filed February 17, 1944, now abandoned.

pair of cooperating cam defining projections or vtively close together.

andere 3 lugs I3, preferably but not necessarily formed integrally with the outer wall of the base. The details of the securing means will be described in greater detail shortly after a brief description of the burner base and cap portions.

The gas burner illustrated in` the drawings is actually the main burner section of a double burner, although the principles of the present invention may be utilized in the construction of other types of burners. The other section of the burner (the simmer section), which is located centrally of the illustrated section. has not been shown as it may take various conventional forms.

The base I2 is preferably made of cast iron. Gas is lead to it through a conduit defining lower portion 20, the bottom of which is machined so that it may be secured to a mixing tube (not shown) supplied with gas and primary combustion air in conventional manner.

The base is provided with an annular inner wall 22 defining a central opening, into which extends the cylindrical lower end 24 of the burner cap. 'Ihis central opening receives the previously referred to but not illustrated simmer section of the burner. 1n the illustrated embodiment, the inside diameter of the opening in wall 22 is machined within close limits and the outer diameter of the cylindrical lower end 24 of the cap is formed within close limits to provide an accurate and close slip fit seal between the two, thereby to prevent undesired leakage of gas from the burner chamber defined by the base and cap members. A close nt of the two members lis desirable as the illustrated cap is made of stainless steel, which has a coeillcient of expansion approximately equal to that of cast iron.

The burner cap I4 is, in accordance with the invention of my copending application, made from thin metal stock, such as stainless steel, preferably having a thickness of about .020 inch and having a port arrangement providing efficient operation of the burner. Metals, other than stainless steel, and other thicknesses may be used.

The requisite port area is provided by a large number of small diameter ports 23 located rela- These ports are formed in a portion 30 of the cap extending generally downwardly and outwardly, at an angle of about 15 degress from the vertical, from the top of the cap which, it may be noted, is connected to the central lower cylindrical portion by a flared portion 32. The ports are arranged in two horizontal rows and the two rows of holes are staggered.

A gas seal is provided at the outer line of contact between the base and cap members by a relatively narrow sealing surface 34 at the underside of an inwardly and downwardly curved peripheral ange on the cap which abuts against the upwardly and outwardly extending annular sealing surface 33 formed at the upper end of the outer base wall 33, which end, it may be noted,

is higher than the central opening 22 in the 4 ends are rounded and of narrow arcuate extent so that they may be readily inserted between the adjacent ends of the cam defining projections I3. Generally speaking, the member Il is diamond shaped. y

The bayonet lock member I3 is mounted on the burner cap so as to be substantially transverse of the conduit 23 when the cap is secured to the base portion. When thus located. it does not interfere to any material extent with the flow of gas into the burner chamber 23 and through the ports 2l.

In order to impart added strength to the bayonet member and to prevent it from cutting into the base member, its outer periphery is rounded to provide a downwardly extending peripherial flange 42. A similar flange 44 is provided at the central apertured portion of the bayonet member. In..some instances it is preferable to have an upturned flange 44 at the central aperture rather than a downwardly extending flange as illustrated. This is particularly true where the projection I3 is lowered somewhat so that its upper surface need not be machined when the sealing surface 36 is machined.

The bayonet member I6 is constructed and arranged to provide an adjusting or compensating action in the event there is some variation in the two cam surfaces 46 located at the undersides of the projections I8. This can be accomplished by a pivotal fastening between the bayonet lock member and the burner cap, as by staking the bayonet lock member to the cap, as indicated by the reference characters 48 (see particularly Fig 4). In order that the requisite pivotal movement be obtained, the inside diameter .of the central opening in the bayonet lock member is made slightly larger than the outside diameter of the central lower portion 24 of the burner cap. In other words, a loose fit is employed.

From the preceding detailed description of the present invention, it may be noted that the burner cap may be secured to and detached from the base member in a very simple manner. All that is necessary to secure the two in assembled relation is to place the cap over the base with the ends 40 of the bayonet lock member located between the ends of the projections I8. Then the cap is rotated to bring the ends 40 underneath the lugs I3 where they can contact the cam surfaces 46. Upon suiiicient rotation, the cap is securely locked to the base member with the sealing surfaces 34 and 36 in abutting relation.

Jamming of the bayonet lock is substantially eliminated because of the rounded edges on the bayonet lock member and a considerable vertical movement may be given to the burner cap for the same reason and because of the relatively narrow ends 40 of the lock member.

The burner of the present invention also requires only a relatively few parts and is easy to manufacture. For instance, the pivoting action of rthe bayonet lock member I6 enables the cam surfaces 46 to be used in the as cast condition. Furthermore, few parts and no screws are required.

The principles of the present invention may be utilized in a construction wherein the cam surfaces are formed in the bayonet member, as Iillustrated in Figs. 5, 6 and 7. Herethe fastening means includes a generally cylindrical bayonet member 50 loosely staked to the central dependent portion 24 of the burner cap. The outer peripheral portion of member 50 is provided with opposed upwardly facing cam suramm.

faces 52, which can be done readily by a stamping operation, and preferably by a single stamping operation used in making the member.

The cam surfaces 62 cooperate with relatively narrow (in arcuate extent) inwardly extending projections 54 formed in the outer burner base wall. In order that the member I4. and the cap itself, may be properly placed relative to the base. the member is provided with slots Il of widths somewhat greater than the projections 54. Considerable vertical movement of the burner cap is provided by making the cam surfaces extend over about 90 of the surface of the member.

In order that gas may flow to the ports without being materially affected by the fastening member, the latter is provided with an annular series of perforations 58. y

Rigidity, strength, and prevention of cutting of parts is obtained by utilization of the downwardly extending outer and inner flanges 60 and 62 corresponding to flanges 42 and 44 of the first em- I bodiment. The member 50 may be pivotally staked to the cap, as indicated by reference characters 48, the stakingbeing so located that the member may pivot thereabout when the cap is being secured in place.

The embodiment of the invention possesses the advantages of the previously described embodiment and it is, therefore, believed unnecessary to repeat them at this point.

In accordance with another and important aspect of the present invention, the desired adjusting or compensating action. in the event there is some variation in the dimensions of the inwardly extending projections on the outer wall of the burner, may be provided by a securing member xedly secured to the burner cap but capable of bending. For instance, the securing member I6 of the first described embodiment may be xedly staked to the downwardly extending portion 24 of the burner cap and be made o! material suiiciently thin so that it will bend in the event the projections i8 are not of the same dimensions.

While but two embodiments of the invention have been illustrated and described in detail, it

not intended to be limitative of the invention, except in so far as set forth in the accompanying claims.

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

1. In a gas burner, the combination including, a burner base having a central opening defined by an inner wall and having also an outer wall spaced from-and extending higher than the inner wall, spaced apart projections extending a short distance radially inwardly from said outer wall, a burner cap overlying said burner base having structure defining an upwardly extending portion having a central opening and extending outward therefrom into abutting engagement with the top a burner base having a central opening dencd by an inner wall and having also an outewall, spaced apart projections extending radially inwardly from said outer wall, a/burner cap overlying said burner, base having structure denning an upwardlyA extending portion having a central openingand extending outward therefrom into abutting engagement with the top of the outer wall of the base and cooperating with the base to form a burner chamber, the inner wall of the base and the inner portion of said cap having adjacent mating sealing surfaces enabling the cap to be moved vertically relative to the base and resilient structure on the upwardly extending portion of said cap above its gas seal forming surface and extending outwardly :across the chamber and underneath said projections for yieldably and detachably fastening said burner cap to said base. j

3. In a gas burner, the combination including, a burner base having a central opening defined vby an inner wall and having also an outer wall,

spaced apart projections extending radially inwardly from said outer wall, a burner cap including structure cooperating with said base to form a burner chamber and having an inner wall defining a central opening and resilient structure on the inner wall of said cap and extending outwardly across the burner chamber and underneath said projections for yieldably and detachably fastening said burner cap to said base.

4. In a gas burner, the combination including.

e a burner base'having a central opening defined Lshould be understood that the details thereof are of the outer wall of the base and cooperating with the base to form a burner chamber, the inner wall of the base and the inner portion of said cap having adjacent mating sealing surfaces enabling the cap to be moved vertically relative to the base and fastening means on the upwardly extending por. tion of said cap above its gas seal forming surface and the inner wall of the base and extending y by an inner wall and having also an outer wall, spaced apart projections extending radially inwardly from said outer wall and having cam surfaces on their undersides, a burner cap overlying said burner base having structure defining an upwardly extendingportion having a central opening and extending outward therefrom into abutting engagement with the top of the outer wall of the base and cooperating with the base to form a burner chamber. the inner wall of the base and the inner portion of said cap having adjacent mating sealing 'surfaces enabling the cap to be moved vertically relative to the base, and means secured to the upwardly extending portion of said cap above its gas seal forming surface and extending outwardly across the chamber and underneath the cam surfaces of said projections for detachably fastening said burner cap to said base.

5. In a gas burner, the combination including, a burner base having a central opening defined by an inner Wall and having also an outer wall, spaced apart projections extending radially inwardly from said outer wall, a burner cap over-l lying said burner base having structure defining an upwardly extending portion having a central opening and extending outward therefrom into abutting engagement with the top of the outer wall of the base and cooperating with the base to form a burner chamber, the inner wall ofthe wardly from said outer wall, a burner cap including structure cooperating with said base to i'orm a burner chamber and having an inner wall deiining a central opening, the inner wall of the base and the inner wall of said cap having adjoining surfaces arranged to form a gas seal, and resilient structure of thin bendable material secured to the structure of said cap above its gas seal forming surface and having opposed arms extending outwardly across said chamber and underneath said projections for yieldably and detachably fastening said burner cap to said base.

7. In a gas burner, the combination including, a burner base having structure deilning spaced apart inner and outer walls, a burner cap having inner wall defining structure and structure cooperating with said base to form a burner chamber. the inner walls of said base and cap having adjacent annular concentric portions and said base and cap having vertically aligned abutting surfaces, whereby the cap can be placed on the base and rotated relative to the base with said abutting surfaces in-engagement, and means for detachably securing said cap to said base by limited rotation oi said cap relative to said base, said securing means including angularly spaced apart relatively short radially inwardly extending projections on and below the top of the outer wall of said base, and fastening structure on the inner wall of said cap having portions extending across the burner' chamber and underneath said projections and engageable therewith upon rotation of said cap.

8. In a gas burner, Athe combination including, a burner base having structure defining spaced apart inner and outer walls and a gas inlet passageway, a burner cap having inner wall dei'lning structure and structure cooperating with said base to form a burner chamber, the inner walls of said base and cap having adjacent annular concentric portions and said base and cap having vertically aligned abutting surfaces, whereby the cap can be placed on the base and rotated relative to the base with said abutting surfaces in engagement, and means for detachably securing said cap to said base by limited rotation of said cap relative to said base, said securing means including a pair of diametrically opposite relatively short radially inwardly extending projections on and below the top of the outer wall of said base, and resilient fastening structure secured to the inner wall of said cap having opposed arms extending across the burner chamber and underneath said projections and engageable therewith upon rotation of said cap, said projections being located so that said arms are substantially transverse of the inlet passageway when the cap is secured to the base.

9. A detachable gas burner cap having an annular generally vertical wall defining a central opening, top structure extending generally outwardly from said wall and terminating in an outer rim portion, said wall and structure adapted to comprise part of a burner chamber wall, and resilient burner cap attaching structure extending radially outwardly from said annular wall to the region of the vertical projection of the rim.

10. A detachable gas burner cap having an annular generally vertical wall deilning a central opening, top structure extending generally outwardly from said wall and terminating in an outer rim portion, said wall and structure adapted to comprise part of a burner chamber wall. said vertical wall having an annular continuous outwardly facing sealingsurface, and resilient burner cap attaching structure secured to said annular wail above said sealing surface and extending radially outwardly from said annular wall to the region of the vertical pro- Jection of the rim.

11. In a gas burner, the combination including. a burner base having structure defining an inner portion and a wall spaced radially outwardly of and above said inner portion, a burner cap having inner, intermediate and outer portions and cooperatively associated with said base to form a burner chamber, the inner portions of said base and cap having apertured concentric portions and said intermediate portion of said cap being spaced from said base wall and said outer portion oi' said cap seating on the top of said base wall. whereby the cap can be placed on the base and rotated relative to the base with said concentric portions intertted and said outer portion abutting against the top of said base wall. and means for detachably securing said cap to said base by limited rotation of said cap relative to said base, said securing means including angularly spaced apart structures below the top of said base wall and extending radially inward from said wall and cooperating fastening structures on said cap extending radially outwardly therefrom and underneath said structures.

12. In a gas burner, the combination including. a burner base having structure dening an inner portion and a wall spaced radially outwardly of and above said inner portion, a burner cap having inner, intermediate and outer portions and cooperatively associated with said base to form a burner chamber, the inner portions of said base and cap having apertured concentric portions and said intermediate portion of said cap being spaced from said base wall and said outer portion of said cap seating on the top of said base wall, whereby the cap can be placed on the base and rotated relative to the base with said concentric portions intertted and said outer portion abutting against the top of said base wal1, and means for detachably securing said cap to said base by limited rotation of said cap relative to said base. said securing means including angularly spaced apart structures on said radially outwardly spaced base wall located below the top of said base wail and radially inwardly from the abutting portions of said cap and wall and cooperating fastening structures on said cap extending radially outwardly therefrom and underneath said structures.

13. In a gas burner, the combination including, a burner base having structure deiining a central opening and a wall located radially outwardly from and above the opening, spaced apart projections disposed below the top of said wall and extending radially inwardly therefrom, a burner cap cooperating with said base to form a burner chamber and having structure dening a central opening and concentrically located relative to the opening defining base structure and a top portion adapted to abut on the top of said base wall, the cap and base being spaced from each other in between said concentric and abutting portions and the concentric portions of said base and cap interitting in such manner that the cap can be moved both vertically and angularly relative to the base when the cap is placed on the base, and fastening means for detachably securing said cap and base by limited relative angular movement between them, said fastening means in- 76 cluding camming portions on said cap between its opening dening structure and abutting portion extending radially outwardly across the space between the top and base wall and under-- neath said projections on the wall.

14. In a gas burner, the combination including, a burner base having structure defining an inner portion and a chamber wall portion spaced radially outwardly of and above said inner portion, a burner cap cooperating with said base to form a burner chamber and having vertically spaced apart inner and outer portions cooperatively associated with said inner and Wall portions of the base, respectively, said cap having a portion intermediate its inner and outer portions spaced from said base wall portion and said base and cap having vertically aligned abutting surfaces, the inner portions of said base and cap having intertting apertured concentric portions, whereby the cap can be placed on the base and rotated relative t the base with said concentric portions intertted and with said abutting surfaces in engagement, and means for detachably securing said cap to said base by limited rotation of said cap relative to said base, said securing means including angularly spaced apart structures below the top of said base wall ,v portion and extending radially inward from said Wall portion and cooperating fastening structures on the intermediate portion of said cap-extending radially outwardly therefrom across said space and underneath said angularly spaced apart structures.

15. A burner cap assembly including a burner cap and a bayonet member for detachably securing the burner cap to a burner base, said cap having a central annular dependent portion, and raid bayonet member comprising a generally diamond shaped member of resilient material and having a central aperture with a continuous annular surface and surrounding and secured to the dependent annular portion of the cap.

16. A burner cap assembly as claimed in claim 15, wherein the periphery of the aperture in s aid member is flanged and the outer periphery of said member has a rounded downwardly extending flange.

17. A burner cap assembly including a burner Y cap and a bayonet member for detachably securing the burner cap to a burner base, said cap having a central dependent portion and said bayonet member comprising a generally circular, centrally apertured member surrounding and secured to the dependent portion of the cap, said member having oppositely located cam delining portions, and an annular series of perforations therethrough.

18. A burner cap assembly as claimed in claim 17, wherein the periphery of the aperture in said member is flanged and the outer periphery of said member has a rounded downwardly extending flange.

19. A burner cap assembly including a burner cap and a bayonet member for detachably securing the burner cap to a burner base, said cap having a central annular dependent portion and an outer rim portion, and said bayonet member comprising structure having a central aperture and surrounding and secured to the dependent annular portion of the cap, said structure including also angularly spaced apart bayonet type fastening members of resilient material extending from said dependent portion outwardly to the region of the vertical projection of the rim.

PHILIP S. HARPER.

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

UNITED STATES PATENTS Number p Name Date 1,144,040 Keller June 22, 1915 1,463,263 Grayson July 31, 1923 1,620,071 Chapelle Mar. 8, 1927 1,805,562 Begue et al May 19, 1931 1,843,361 Hageman Feb. 2, 1932 1,923,337 Stant Aug. 22, 1933 2,009,271 Moecker July 23, 1935 2,107,575 Matthews et al Feb. 8, 1938 2,386,113 Harper et al. Oct. 2, 1945

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