US3117568A - Camp stove with sheet metal burner - Google Patents

Description

Jan. 14, 1964 H. HOENISCH 3,117,568

CAMP STOVE WITH SHEET METAL BURNER Filed March 21, 1961 5 Sheets-Sheet 1 INV EN TOR.

Jan. 14, 1964 H. HOENISCH 3,117,568

CAMP STOVE WITH SHEET METAL BURNER Filed March 21, 1961 5 Sheets-Sheet 2 INVENTOR. fldra/ #0 7773 6/? Jan. 14, 1964 H. HOENISCH 3,117,568

CAMP STOVE WITH SHEET METAL BURNER Filed March 21, 1961 5 Sheets-Sheet 3 Jan. 14, 1964 1-1. HOENISCH CAMP STOVE WITH SHEET METAL BURNER 5 Sheets-Sheet 4 Filed March 21, 1961 INVENTOR. flaro/J #00 71. .3 (/4 H. HOENISCH CAMP STOVE WITH SHEET METAL BURNER Jan. 14, 1964 5 Sheets- Sheet 5 Filed March 21, 1961 M W M J United States Patent 3,117,568 CAMP STOVE WITH SHEET METAL BURNER Harold Hoenisch, Albert Lea, Minn., assignor to King- Faeeley Thermos (1a., Ann Arbor, Mich, a corporation of Michigan Filed Mar. 21, 1961, Ser. No. 97,181 8 Claims. (Cl. 126-38) This invention relates to camp stoves, and more particularly to portable pressure stoves for burning gasoline and other hydrocarbon liquids.

It is an object of the invention to provide a novel and improved stove of this type which is extremely inexpensive to manufacture and in which a sheet metal burner manifold may be utilized without danger of excessive manifold temperatures which might detract from efficient stove operation.

It is another object to provide an improved stove of this nature which includes a novel burner ring construction creating eificient flame configuration with a minimum number of parts and which reduces the possibility of burner aperture clogging and further results in a lower temperature for the manifold on which the burner is mounted.

It is also an object to provide an improved stove having the above characteristics which incorporates means permitting the stove to be eificiently used at high altitudes where the combustion air requirements are great, at the same time providing for operation at lower altitudes by a simple adjustment.

Other objects, features, and advantages of the present invention will become apparent from the subsequent description, taken in conjunciton with the accompanying drawings.

In the drawings:

FIGURE 1 is a perspective view of the stove shown in its open position with the gasoline tank operatively mounted on the front of the casing;

FIGURE 2 is a top view of the stove when in open and operative position, showing the relative location of various stove components;

FEGURE 3 is a side elevational view in cross section taken along the line 33 of FIGURE 2 and showing the manner in which the generator tube is connected to the venturi inductor;

FlGURE 4 is an enlarged cross-sectional view taken along the line 4-4 of FIGURE 3 and showing the air adjustment for the venturi inductor;

FIGURE 5 is a front elevational view, partly in cross section, of the manifold assembly showing the air control valve for the auxiliary burner ring;

FIGURE 6 is a top elevational view of the manifold assembly partly in cross section and showing the burner ring construction;

FEGURE 7 is a cross-sectional view in elevation taken along the line 77 of FIGURE 5 and showing the manner of joining the upper and lower sections of the manifold;

FEGURE 8 is a top plan view of the lower manifold member; and

FIGURE 9 is a cross-sectional view in elevation taken along line 9-9 of FIGURE 6 and showing the manner in which the burner rings are secured to the upper manifold plate.

in general terms, the illustrated embodiment of the invention comprises a casing with a hinged upper lid and a gasoline tank mountable on the casing front with a generator-filter tube which projects into a venturi inductor. The latter in turn is connected to a burner manifold of elongated shape secured Within the casing, the manifold being fabricated of stamped sheet metal parts sealed together. Burner rings of inverted cup shape are mounted 3d N558 Patented Jan. 14, 1964 ice on the manifold, each burner ring having an annular depressed portion adjacent at the outer edge with radially extending slots having inner portions formed in the main horizontal burner ring section and an outer inclined section adjacent the depressed portion. A raised burner ring portion surrounds the depressed portion.

It has been found that the novel burner configuration of this invention reduces clogging, prevents excessive manifold temperature, and permits manufacturer of the burner with a minimum number of parts.

Another feature of the invention is the provision of a venturi inductor at the generator-filter tube outlet, together with an adjustable air inlet for the inductor which is of large size, so that the stove may be used at high altitudes as well as near sea level.

Referring more particularly to the drawings, the stove is generally indicated at 11 and comprises a casing generally indicated at 12 with a lower portion 13 and an upper lid 14 hinged thereto at 15. The casing is of generally rectangular shape, and a grill 16 for supporting utensils is provided above the casing, this grill being swingable between a lower position as seen in FIGURE 1 and an upper position about hinges 15. Air deflector shields 17 are foldably mounted on the side edges of the grill and may be collapsed when the stove is being transported.

A subassembly generally indicated at 18 and comprising a gasoline tank 19, a valve body 21 and a generatorfilter tube 22 of known construction, is provided, this subassembly being mountable on the front of casing 13 by means of hooks 23 and beign storable within the casing when the stove is being transported. Tank 1% has a filler plug 24 and a pressure pump 25, while valve body 21 is provided with an air valve controlled by handle 26 and a fuel-flow control valve having a handle 27. When the tank is mounted on the front of the casing, generatorfilter tube 22 exends through and beneath grill 16 into the entrance of a venturi inductor tube 28, as seen in FIGURE 3.

Tube 28 is of generally U-shaped configuration, with an upper entrance of relatively wide circular shape which tapers down to a narrow main portion. An air inductor shield 29 is mounted on the entrance portion of tube 28 and extends rearwardly therefrom, as seen in FIGURE 3. This shield is of elongated inverted channel shape with a front wall 31 having an aperture into which the exit end of tube 22 extends. The underside of the entrance portion of tube 28 has an elongated air inlet 32, and a shutter 33 shaped as an incomplete ring is mounted within the tube entrance as seen in FiGURE 4. Shutter 33 is rotatable between positions opening or partially closing air inlet 32., and for this purpose a screw 34 is mounted on the shutter and extends upwardly through access slots in members 28 and 29.

The lower end of inductor tube 28 is secured to a burner manifold assembly generally indicated at 35. The construction of this manifold assembly is perhaps best seen in FIGURES 5 through 9. The manifold assembly comprises a lower manifold member 36 and an upper manifold member 37, these members being of generally elongated shape and preferably being stamped of sheet metal and sealed together around their edges by overlapping flanges 38 and 39 on members as and 37 respectively. Legs 41, which may likewise be fabricated of bent sheet metal, serve to support the manifold assembly above the bottom of casing 12 as seen in FIGURE 5.

The lower manifold member 36 has an outer flat portion and an elongated central depressed portion 42, as seen in FIGURE 8. The left hand section 43 of depression 42 as seen in this figure, is somewhat enlarged, and its rear wall 44 has an apertured portion 45 within which the lower end of inductor tube 23 is secured. An apertured portion re is provided in the bottom of the ri ht hand portion of depression 42, as seen in FIGURE 8, this apertured portion receiving an internally threaded bushing 47 seen in FIGURE 9 for purposes which will hereafter appear.

Upper plate 37 of manifold assembly 35 is of generally fiat shape, with central portions thereof having slightly raised ribs 48 for strengthening purposes. The left and right hand portions of plate 37, as seen in FIGURE 6, have annular raised portions 4% and 51 respectively, these raised portions being shown as having: the same diameter. A pair of threaded bolt receiving members 52 are secured beneath plate 37 inwardly of each raised portion 49 and 51 in order to accommodate bolts which hold down the burner rings to be later described. A plurality of fuelilow apertures 53 are provided in the central portion of the plate area within raised portion 49, as seen in FIG- URE 6. A single relatively large fuel-flow aperture 54 is provided in the por.ion of plate 37 within raised portion 51, aperture 54 being concentric with this raised portion.

A pair of burner rings generally indicated at 55 and a: are mounted on raised portions 49 and 51. respectively of plate 37, each of these burner rings being of identical construction and preferably fabricated of stamped and drawn sheet metal. Each burner ring is of generally inverted cup shape, with a cylindrical outer wall 57 adapted to fit immediately outside of raised portion 49 or 51. The upper portion of wall 57 is inwardly and downwardly curved so as to form an annular outer wall designated at 58. The lower portion of this outer wall is again reversely bent as indicated at 59, and is thereafter inclined upwardly and inwardly as indicated at 63. The central portion of each burner ring, indicated at 62, is relatively flat but is of a lower height than the top of Wall 58. Slightly raised stifienirig ribs 63 may be formed in this central flat portion, together with apertured portions for receiving bolts 64 which are threadable into members 52 for securing the burner rings in place.

A large number of circumferentially spaced and radially extending iiame slots 65 are formed in each burner ring. These slots begin at a point somewhat inwardly of inclined portion 61, and extend through this inclined portion to the lowermost portion of depression 5%. Each slot thus has an inner horizontal portion and an outer inclined portion, the latter portion facing wall 58 which is in spaced relation therewith. A fuel control disc valve 66 is provided beneath circular aperture 54, this valve being mounted at the upper end of a threaded post 67 mounted in bushing 47. The lower end of post 67 carries a lever 63 secured thereto, this lever being roekable by a handle 69 which is pivoted thereto and extends forwardly therefrom to the front end of the casing as seen in FIG- URE 1. Rotation of lever 68 will cause post 67 to be raised or lowered, thereby shutting off or adjusting the amount of fuel-air mixture which may flow upwardly through aperture 54 to auxiliary burner 56.

in operation, pressurizing tank 19 and opening both the air and fuel flow valves will permit fuel-air mixture to flow through tubes 22 and 28 into the manifold and rent the manifold into the burner rings, where it may be ignited. After a short period of operation of main burner 55, tube 22 will be heated sufficiently to vaporize the liquid gasoline in the generator. This makes it feasible to permit air valve 2: to be closed, secondary air induced at venturi tube 28 being sufiicient to support com bustion. The amount of air flowing into the venturi tube may be adjusted by shutter 33.

Fuel flowing outwardly through slots 65 will burn in a manner such that clogging of the slots will be substantially reduced. Annular wall 58 will serve to prevent induction of air flow into the slots which might detract from air control and result in unstable burning. The construction is also such that very little heat will be carried back to the manifold itself, and the sheet metal manifold construction, fabrigata'ole at exceedingly low cost as compared with conventional cast versions, will thus still serve in a completely satisfactory manner.

While it will be apparent that the preferred embodiment of the invention disclosed is well calculated to ful fill the objects above stated, it will be appreciated that the V invention is susceptible to modification, variation and change without departing from the proper scope or fair meaning of the subjoined claims.

What is claimed is:

1. In a hydrocarbon-burning stove of the type having a fuel tank, a generator-filter tube leading from said tank, an inductor tube connected to the exit end of said generator-filter tube, a manifold connected to the exit end of said inductor tube, and a burner ring mounted on said manifold, said burner ring being of generally inverted cup-shaped configuration, the improvement comprising an annular depression adjacent the upper outer edge of said burner ring, and a plurality of slots in said burner ring extending radially inwardly a short distance from said depression, the inner wall of said depression being inclined upwardly and inwardly, the outer portions of said slots being formed in said inclined wall.

2. The combination according to claim 1, the top of the outer wall of said depression being higher than the portion of said burner ring inwardly of said depression.

3. The combination according to claim 1, said manifold comprising a plurality of sheet metal stampings sealed together, the lower edge of said burner ring being engageable with one of said stampings.

4. In a hydrocarbon-burning stove, a manifold comprising upper and lower sheet metal stampings sealed together along their edges, said lower stamping having a central depressed portion forming a chamber, the upper stamping being relatively flat, a burner ring having an annular substantially vertical side wall and a generally flat circular top, means securing said burner ring to said flat manifold stamping with the lower edge of said side wall engaging said stamping, apertured portions in said fiat manifold stamping beneath said burner ring for fuel flow, an annular depressed portion immediately inwardly of the juncture of said burner ring side wall and top, and a plurality of circumferentially spaced radially extending flame slots in said burner ring extending a short distance inwardly from said annular depressed portion, the inner wall of said depressed portion being inclined upwardly and inwardly, the outer portions of said slots being formed in said inclined wall.

5. In a hydrocarbon-burning stove, a manifold having a flat top, a burner ring of generally inverted cup shape secured to said flat top, said burner ring having a substantially vertical annular side wall the lower edge of which engages said manifold top, an annular depressed portion in said burner ring immediately inwardly of the upper edge of said side wall, said depression having an upwardly and inwardly inclined inner wall and a substantially vertical outer wall of greater height than said inner wall, and a plurality of circumferentially spaced flame slots in said burner ring extending a short distance inwardly from said depressed portion.

6. In an integral burner ring construction for a hydrocarbon-burning stove, an annular upwardly extending sidewall having an exposed downwardly facing lower edge, a reversely and downwardly bent annular portion integrally formed with the top of said side wall, a second reversely' and upwardly bent annular portion integrally formed with: the bottom of said downwardly bent portion and a substantial distance above the lower edge of said side Wall, a substantially flat circular portion integrally formed with and extending inwardly from the upper end of said second reversely bent portion, and a plurality of circumferentially spaced slots in said circular portion extending a short distance inwardly from the depression formed by said second reversely bent portion.

7. In an integral burner ring construction for a hydro-- carbon-burning stove, an annular upwardly extending side wall having an exposed downwardly facing lower edge, a reversely and downwardly bent annular portion integrally formed with the top of said side wall, a second reversely and upwardly bent annular portion integrally formed with the bottom of said downwardly bent portion and a substantial distance above the lower edge of said side wall, a substantially fiat circular portion integrally formed with and extending inwardly from the upper end of said second reversely bent portion, and a plurality of circumferentially spaced slots in said circular portion extending a short distance inwardly from the depression formed by said second reversely bent portion, the inner wall of said second reversely bent portion being inclined upwardly and inwardly, the outer portions of said slots being formed in said inclined inner wall.

8. In a portable hydrocarbon-burning stove of the type having a casing, a burner manifold within said casing, a fuel tank detachably mountable on said casing, and a generator-filter tube extending inwardly from said fuel tank over said burner manifold, the combination with said stove of a venturi inductor tube having a relatively wide horizontal entrance portion. and a narrow portion leading therefrom to said burner manifold, an air inductor shield of elongated inverted channel shape having a front wall with an apertured portion into which the exit end of said generator-filter tube extends, an elongated air inlet on the underside of said entrance portion of the venturi inductor tube, a shutter shaped as an incomplete ring mounted within said entrance portion and in rotatable sliding relation therewith between positions opening or partially closing said air inlet, access slots in registry on said entrance portion and shield, and a screw mounted on said shutter and extending through said access slots.

References Cited in the file of this patent UNITED STATES PATENTS 390,352 Doty Oct. 2, 1888 401,783 Kahn Apr. 23, 1889 427,666 Bucklin May 13, 1890 761,098 Porter May 31, 1904 1,005,431 Huber Oct. 10, 1911 1,551,788 Benson Sept. 1, 1925 2,302,880 Nelson et al. Nov. 24, 1942 2,499,556 Zink Mar. 7, 1950 2,638,976 Vixler May 19, 1953 2,711,215 Squire et al. June 21, 1955 2,744,809 Falligant May 8, 1956 2,815,070 Lamar Dec. 3, 1957 2,824,605 Dolby Feb. 25, 1958

Claims (1)

1. IN A HYDROCARBON-BURNING STOVE OF THE TYPE HAVING A FUEL TANK, A GENERATOR-FILTER TUBE LEADING FROM SAID TANK, AN INDUCTOR TUBE CONNECTED TO THE EXIT END OF SAID GENERATOR-FILTER TUBE, A MANIFOLD CONNECTED TO THE EXIT END OF SAID INDUCTOR TUBE, AND A BURNER RING MOUNTED ON SAID MANIFOLD, SAID BURNER RING BEING OF GENERALLY INVERTED CUP-SHAPED CONFIGURATION, THE IMPROVEMENT COMPRISING AN ANNULAR DEPRESSION ADJACENT THE UPPER OUTER EDGE OF SAID BURNER RING, AND A PLURALITY OF SLOTS IN SAID BURNER RING EXTENDING RADIALLY INWARDLY A SHORT DISTANCE FROM SAID DEPRESSION, THE INNER WALL OF SAID DEPRESSION BEING INCLINED UPWARDLY AND INWARDLY, THE OUTER PORTIONS OF SAID SLOTS BEING FORMED IN SAID INCLINED WALL.

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