US3806306A

US3806306A - Gas burner and flash tube assembly

Info

Publication number: US3806306A
Application number: US00307973A
Authority: US
Inventors: D Duperow; W Ferlin
Original assignee: Lincoln Brass Works Inc
Current assignee: Lincoln Brass Works Inc
Priority date: 1972-11-20
Filing date: 1972-11-20
Publication date: 1974-04-23
Anticipated expiration: 1991-04-23

Abstract

The body of a flash tube has a pair of longitudinal prongs inserted into an opening in the body of the gas burner. The tube body is longitudinally slit and stressed to urge notches in the prongs into tight locking engagement in the opening. The prongs are movable toward each other by squeezing the tube to facilitate assembly and disassembly of the tube and burner.

Description

United States Patent 1191 [11] i r 3,806,306 [451 Apr. 23, 1974 Duperow et a1.

[5 GAS BURNER AND FLASH TUBE ASSEMBLY [75] lnventors: Donald E. Duperow; William J.

Ferlin, both of Detroit, Mich.

[73] Assignee: Lincoln Brass Works, Inc., Detroit,

Mich.

22 Filed: Nov. 20, 1972 211 Appl. o.: 307,973

[52] US. Cl. 431/193 [51] Int. Cl. F246 3/10 [58] Field of Search 431/191, 192, 193, 194

[56] t References Cited UNITED STATES PATENTS 2,524,210 -10/l950 Reeves 431/193 2,537,692 1/1951 Mueller 43 1/191 X 1,060,906 5/1913 Kiefer 431/191 2,490,885 12/1949 Reeves....; ..431/193 Primary Examiner-Edward G. Favors [57 ABSTRACT The body of a flash tube has a pair of longitudinal prongs inserted into an opening in. the body of the gas burner. The tube body is longitudinally slit and stressed to urge notches in the prongs into tight locking engagement in the opening. The prongs are movable toward each other by squeezing the tube to facilitate assembly and disassembly of the tube and burner.

16 Claims, 7 Drawing Figures on the fitting with its open end aligned with charging ports in the burner body. Manufacture of the fitting and attaching it to the burner body adds significantly to the cost of the burner-flash tube assembly.

Moreover in conventional assemblies there is clearance or. tolerance between the interengaged elements of theflash tube and fitting which results in objectionable rattling when the assembly is used in a range mounted in a movable vehicle such as a mobile home.

The object of the present invention is to provide a gas burner andflash tube assembly wherein the attachment structure is relatively simple, inexpensive and improved to eliminate the conventional intermediate mounting bracket and also improved to provide a tight, nonrattling connection between the tube and burner.

Generally the invention contemplates the use of a pair of prong-like extensions of the burner tube body notched for direct locking interengagement within an opening in the burner body. The tube body is longitudinally slit and is stressed to urge the locking notches tightly against sides of the opening to eliminate rattling. By squeezing the tube the prongs can be moved toward each other to facilitate assembly and disassembly thereof relative to the burner body opening.

One form of the invention is illustrated in the accompanying drawings.

FIG. 1 is a top plan view of a gas range embodying structure according to the present invention, portions being broken away to illustrate structural details.

FIG.2 is an enlarged sectional view on line 2-2 of FIG. 1.

.FIG. 3 is a further enlarged sectional view on line 3-3 of FIG. 2.

FIG. 4 is a further enlarged fragmentary top plan view of prong structure illustrated in FIG. 3.

FIG. 5 is an end elevational view of the flash tube illustrated in FIG. 3.

FIG. 6 is a fragmentary elevational view taken in the direction of Arrow 6 of FIG. 2.

FIG. 7 is an enlarged sectional view on line 7-7 of FIG. 3.

Shown in thedrawings is a gas range 10 having a plurality of burners 12 distributed around a central pilot burner 14 positioned within a surrounding shield 16. A flash tube 18 isprovided for each burner 12. Each flash tube has an inner end portion 20 supported by shield 16 adjacent pilot flame F and has an outer end portion 22 connected to and supported by a burner 12 through an attachment 24 according to the present invention.

. nular array of main burner ports32 and carryover ports 34 in alternatearrangement. Wall 28 has a shoulder 36 engaged against the top of a bottom closure plate 38 and side wall 28 continues in a skirt 40 below the closure plate. Skirt 40 at a number of circumferentially distributed locations is lancedand deformed inwardly under the bottom of plate 38 as at 42 to secure burner body or cup 25 to plate 38. Burner 12 is supported I within range 10 by a bracket 43.

Cup 25 and plate 38 define a chamber 44 which receives a mixture of fuel gas and primary air from a mixing tube 46 through an opening in plate 38. The fuel gas is injected into the mixing tube by a valve 48 having an operating handle 49.

Side wall 28 is provided with charging ports 50. When valve 48 is turned on, the gas mixture enters chamber 44 and issues through ports 50 into the adjacent open end 52 of flash tube 18 for ignition at the op.- posite open end 54 of the tube by pilot flame F. As is conventional, ignition flashes back through tube 18 to ignitegas issuing from ports 50. Side wall 28 is provided with chain ignition ports 56 above ports 50 which carry ignition from ports 50 upwardly to burner ports In accordance with the invention, attachment 24 comprises portions of the body of flash tube 18 at tached directly to portions of the body of burner 12. In the structure illustrated, flash tube l8has a longitudinal slit 58 with a circumferential enlargement 60 adjacent open end 52. Portions 61 of the tube body at opposite sides of the slit enlargement extend downwardly adjacent end 52 and then longitudinally to provide a pair of prongs 62 which project beyond end 52 and are surface 72. The prongs are flat and each has an upper I surface 74 and a lower surface 76.

Skirt portion 40 of side wall 218 has a pairof slot shaped openings 78 below closure plate 38. The web 79 between openings 78 serves only to leave a strengthening member for the relatively thin metal of skirt 40 and otherwise has no function. Functionally, the web could be eliminated so that instead of two slots 78 a single slot would result. Accordingly openings 78 will be treated herein simply as a single opening. The opening has upper surface portions 80, lower surface portions 82 and side portions 84. Prongs 62 are dimensioned and configured to be inserted into opening 78.

Prior to assembly of the flash tube and burner body, slit portions 58, 60 of the tube are open more widely than is illustrated in FIG. 3 with the result that prongs 62 are separated more widely. To assemble the flash tube and burner body the distancebetween prongs 62 must be decreased. This is done either by squeezing the tube in the direction of the arrows :in FIG. 3 or by forcing cam surfaces 72 against sides 84 of opening 78 or both. When shoulders 70 clear sides 84 the prongs are snapped outwardly under the stress of the constricted tube and hook over or engage the inner surface 86 of skirt 40. Shoulders 68 engage the outer surface 88 of the skirt to limit the extent of penetration of the prongs into the opening- The stress in the body of tube 18 urges socket bottoms 66 into tight engagement with I sides 84 of the opening. Top and bottom surfaces 74,

76 of the prongs engage top and bottom surfaces 80, 82 of opening 78 respectively to limit vertical movement of the prongs within the opening. I

Notch bottoms66, shoulders 68, and upper and

lower surfaces

74, 76 of prongs 62 may be regarded as four sets of shoulders which respectively engage four corresponding sets of

shoulders

84, 88, 86 and 80, 82 defined by inner and outer portions of skirt 40 and portions of opening 78. Interengagement of these sets of shoulders secures open end 52 of the flash tube 18 in the proper horizontal location both longitudinally and laterally of the tube and in a proper vertical location. The tight engagement between

shoulders

66 and 84 secures the interengaged parts of the flash tube and skirt 40 against relative movement and thereby prevents these parts from rattling such as when gas range is mounted in a moving vehicle.

Attachment structure 24 is very inexpensive in that depending portions 61- and prong portions 62 can be formed quickly and very inexpensively in a stamping operation. Opening 78 can be formed in skirt 40 in the same punching operation which results in charging ports 50 and chain ports 56.

The flexibility of tube end 22 to squeezing force applied thereto can be increased or decreased as desired by respectively increasing or decreasing the longitudinal extent of slit enlargement 60.

Since opening 78 is in that portion of skirt 40 which is below closure plate 38, attachment 24 involves no puncturing or penetration of the metal defining gas chamber 44 and consequently the attachment does not give rise to any sealing or leakage problem. Since prongs 62 are dispsed below

ports

50 and 56 the prongs protect the flames at these ports against the wiping action of strong updrafts of air when the burner is in heated condition.

To disassemble flash tube 18 and burner 12, tube 18 is again squeezed adjacent end 22 to force prongs 62 toward each other and thereby disengage inner shoulders 70 from inner surface 86 of skirt 40. The prongs are then withdrawn from opening 78. To reassemble the tube and burner, prongs 62 are reinserted into opening 78 by the procedure described above.

We claim:

1. In a gas burner and flash tube assembly wherein the burner has a top, a bottom wall and a side wall which contains charge porting, improved structure for attaching said flash tube to said burner with an open end thereof aligned with said porting which comprises,

a portion of one of said walls adjacent said porting,

said tube being defined by a body having a portion adjacent said open end,

said portions being respectively configured and dimensioned to form elements which are detachably interengaged,

said elements comprising interengaged aperture and insert means,

said wall portion being apertured and said tube por tion projecting away from said open end to form said insert means,

said aperture and insert means having a first set of shoulders which are interengaged to obstruct entry of said insert means into said aperture means beyond a predetermined distance,

said aperture and insert means having a second set of shoulders interengaged to obstruct withdrawal of said insert means from said aperture means,

said tube body adjacent said open end being resiliently variable in its diametral dimension to facilitate engagement and disengagement of the shoulders of said second set.

2. The structure defined in claim 1 wherein said aperture and insert means have a third set of shoulders interengaged to obstruct movement of said tube end laterally in a horizontal direction.

3. The structure defined in claim 2 wherein said aperture and insert means have a fourth set of shoulders interengaged to obstruct movement of said tube end laterally in a vertical direction.

4. The structure defined in claim 3 wherein one of said third and fourth sets of shoulders are urged toward firm interengagement by the resiliency of said tube'.

5. The structure defined in claim 4 wherein said one set of shoulders comprises said third set.

6. The structure defined in claim 1 wherein said tube body has a longitudinal slot extending through said portion thereof and away from said portion beyond said open end to facilitate said resilient variation.

7. The structure defined in claim 6 wherein said slot extends throughout the length of said tube body and has a circumferential enlargement which extends through said tube body portion and away from said portion beyond said open end.

8. In a gas burner and flash tube assembly wherein the burner body has a top, a bottom wall and a side wall which contains charging ports, improved structure for attaching said flash tube to said burner with an open end thereof aligned with said charging ports which comprises,

a portion of one of said walls disposed below and adjacent said charging ports, said tube being defined by a body having a portion adjacent said open end,

one of said portions extending in a generally vertical direction and having an opening with a top, bottom and sides,

the other of said portions having the shape of a pair of generally horizontally extending prongs each having an upper surface and a lower surface engaged respectively against the top and bottom of said opening,

each prong having a notch, the notches facing in opposite directions,

each notch having a bottom flanked by an outer and inner shoulder,

said bottom of each notch being engaged against a respective side of said opening with said outer and inner shoulders engaged respectively with outer and inner surfaces of said one portion adjacent said sides,

the body of which said other portion forms a part being stressed to urge said bottoms against said sides,

the latter said body being resiliently distortable to facilitate retraction of said notch bottoms from said sides and disengagement of said inner shoulders from said inner surfaces to facilitate withdrawal of said prongs from said opening.

9. The structure defined in claim 8 wherein said one portion comprises said portion of one of said walls and said other portion comprises said portion of said tube body.

10. The structure defined in claim 9 wherein said tube body has a longitudinal slot to facilitate said distortion thereof.

11. The structure defined in claim 10 wherein said prongs are moved closer together to so disengage said inner shoulders thereof.

12. The structure defined in claim 11 wherein said prongs have cam shaped free ends operable upon forcible engagement against said sides of said opening to move said prongs toward each other to facilitate insertion thereof into said opening.

13. The structure defined in claim wherein said one wall portion comprises a portion of said side wall below said bottom wall.

14. In a gas burner and flash tube assembly wherein the burner has a topga bottom wall and a side wall which contains charge porting, improved structure for attaching said flash tube to said burner with an open end therof aligned with said porting which comprises,

a portion of one of said walls adjacent said porting,

said tube being defined by a body having a portion adjacent said open end, i

said elements comprising interengaged aperture and insert means, i

said aperture and insert means having a first set of shoulders which are interengaged to obstruct entry of said insert means into said aperture rneans beyond a predetermined distance,

i said tube body adjacent said open end being resil iently variable in its diametral dimension to facilitate engagement and disengagement of theshoulders of said second set. i

15. The structure defined in claim 14 wherein said wall portion is apertured and said tube portion projects away from said open end to form said insert means.

16. The structure defined in claim 14 wherein said side wall being below said bottom wall and beneath said charging ports.

Claims

1. In a gas burner and flash tube assembly wherein the burner has a top, a bottom wall and a side wall which contains charge porting, improved structure for attaching said flash tube to said burner with an open end thereof aligned with said porting which comprises, a portion of one of said walls adjacent said porting, said tube being defined by a body having a portion adjacent said open end, said portions being respectively configured and dimensioned to form elements which are detachably interengaged, said elements comprising interengaged aperture and insert means, said wall portion being apertured and said tube portion projecting away from said open end to form said insert means, said aperture and insert means having a first set of shoulders which are interengaged to obstruct entry of said insert means into said aperture means beyond a predetermined distance, said aperture and insert means having a second set of shoulders interengaged to obstruct withdrawal of said insert means from said aperture means, said tube body adjacent said open end being resiliently variable in its diametral dimension to facilitate engagement and disengagement of the shoulders of said second set.

4. The structure defined in claim 3 wherein one of said third and fourth sets of shoulders are urged toward firm interengagement by the resiliency of said tube.

8. In a gas burner and flash tube assembly wherein the burner body has a top, a bottom wall and a side wall which contains charging ports, improved structure for attaching said flash tube to said burNer with an open end thereof aligned with said charging ports which comprises, a portion of one of said walls disposed below and adjacent said charging ports, said tube being defined by a body having a portion adjacent said open end, one of said portions extending in a generally vertical direction and having an opening with a top, bottom and sides, the other of said portions having the shape of a pair of generally horizontally extending prongs each having an upper surface and a lower surface engaged respectively against the top and bottom of said opening, each prong having a notch, the notches facing in opposite directions, each notch having a bottom flanked by an outer and inner shoulder, said bottom of each notch being engaged against a respective side of said opening with said outer and inner shoulders engaged respectively with outer and inner surfaces of said one portion adjacent said sides, the body of which said other portion forms a part being stressed to urge said bottoms against said sides, the latter said body being resiliently distortable to facilitate retraction of said notch bottoms from said sides and disengagement of said inner shoulders from said inner surfaces to facilitate withdrawal of said prongs from said opening.

13. The structure defined in claim 10 wherein said one wall portion comprises a portion of said side wall below said bottom wall.

14. In a gas burner and flash tube assembly wherein the burner has a top, a bottom wall and a side wall which contains charge porting, improved structure for attaching said flash tube to said burner with an open end therof aligned with said porting which comprises, a portion of one of said walls adjacent said porting, said tube being defined by a body having a portion adjacent said open end, said portions being respectively configured and dimensioned to form elements which are detachably interengaged, said elements comprising interengaged aperture and insert means, said aperture and insert means having a first set of shoulders which are interengaged to obstruct entry of said insert means into said aperture means beyond a predetermined distance, said aperture and insert means having a second set of shoulders interengaged to obstruct withdrawal of said insert means from said aperture means, said tube body adjacent said open end being resiliently variable in its diametral dimension to facilitate engagement and disengagement of the shoulders of said second set.

16. The structure defined in claim 14 wherein said one wall comprises said side wall, said portion of said side wall being below said bottom wall and beneath said charging ports.