US 2538538 A
Description (OCR text may contain errors)
Jan. 16, 1951 E, STEMPEL ET AL 2,538,538
PRESSURE GASOLINE SPORTSMANS STOVE Filed Aug. 4, 1945 2 Sheets-Sheet l l 33W 1 M33 W 35/ 37% l jd/ l I l I l l 5621/ 7 I 100 j r I Aiarweys Jan. 16, 1951 E. H. STEMPEL ET AL PRESSURE GASOLINE SPORTSMANS STOVE Filed Aug. 4, 1945 2 Sheets-Sheet 2 Patented Jan. 16, 1951 UNITED STATES PATENT OFFICE 'PRESSURE GASOLINE SPOETSMANS STOVE' Edward H. Stempel, York, 2a., and Sophus Rasmussen,'Albert Lea, Minn,, assignors to American Gas Machine Company, Albert Lea, Minn., a corporation of Minnesota Application August 4, 1945, SerialNo. 608,928
lClaim. (Cl. 126 -38) ";This invention relates to compact, readily port able, pressure stoves for burning gasoline and other hydrocarbon liquids which are particularly adapted for use by sportsmen, campers, tourists andthe like.
It is an object of our invention to provide a simplified, highly efficient and very compact sportsmans stove of theolass described-wherein the entire device, when carried, may be embodied in the; form of a substantially cylindrical package with the working parts thereof encased and protected and of such size and weight that it may be, conveniently supported from a belt, pocket or.- other parts of the wearing apparel of the user.
,. Another object is the provision of a sportsmans stoveof the class described comprising acom bination pressure tank and base with an upfstanding burner supported therefrom and with 7 a collapsible cooking utensil support associated with the. burner in combination with a dual pur- V ppse cap member which acts as a protective sheathing for the burner and its related parts and which further, serves the function of providing a cooking receptaele when our stove is pe dc c Another object is the provision'of an efiicient, compact sportsmans stove which may be readily startedout of doors and wherein the fiameproduced will not be materially affected by wind,
although no special shielding means; are provlded.
Still another object is the provision in a stove of the class described, of efficient but materially simplified regulating valve structure for controlling the mixturefed to the burner and utilizing certain of the stove parts, including the con-- duit which connects the fuel tank with the burner, as a part of the valve mechanism.
Another object is the provision of a very small compact pressure gasoline stove which when compacted, for portability, has its'burner and other parts encased, but which nevertheless, may
be very quickly set up, started and utilized for cooking purposes.
These and other objects and advantages of our, invention will be more apparent from the following description made in connection with the accompanying drawings, wherein like reference characters refer to the same parts throughout the several views, and in which:
Fig. l is a front elevation, showing an embodiment of our invention in operation;
Fig. 2 is a top plan view with the combination closure cap and cooking receptacle removed;
Fig. 3 is a side elevation of the device in compacted form, with the closure cap attached;
Fig. 4 is a rear elevation of the same;
Fig. 5 is a top plan view of the same;
Fig. 6 is an enlarged, vertical section taken axially through the sportsmans stove in condition for operation; and r 7 h Fig. 7 is a detail cross section, taken on the line 1l of Fig. 6, showingthe extensible handle for adjusting the regulating valve.
In the form of our invention illustrated, a
pressure tank orfount Ill is provided, of cylindrical shape and having, as shown, a convex bottom ma which is providedwith an axially disposed, internally threaded filling sleeve lllb in which a detachable closure plug II, is threadedly seated with sealing effect. The lower edge of tank to is preferably reinforced by connection with the annular marginal edge of the bottom file, to form an annular skirt I00, acting as the.
base 'or pedestal for the entire stove.
, A housing or fitting, designated as an entirety by the letter F, is axially mounted in the top of pressure tank l0, as shown, having a somewhat diminished, upstanding. nipple 12a which is externally threaded and extended through a, suitable, circular aperture in the top of the tank. Aninternally threaded clamping collar l3 engages the nipple lza'and clamps fitting F to the tank. Fitting F is provided with an axial passage of preferably circular cross section extending from its upper end (nipple l2a) to a point adjacent the lower endv thereof.
forms a small communication chamber IZb be tween the discharge end of 3. depending fuel pipe I l which. is connected at its upper and horizontally extending extremity Ma, with a suitable lateral port l5 formed in fitting F. A vertical,
restricting and cleaner-carrying rod l6 extends axially of fittingFand as shown, is affixed to the lower end thereof by threaded connection [5a with a suitable threadedfsocket tapped therein. Concentrically surrounding the upstanding rod 16 and disposed in slight, spaced relation thereto, is a conduit ll, defining in conjunction with the rod IS, an upwardly extending annular fuel passage and this conduit or sleeve ll, adjacent its' lower end, is externally threaded to engage and interfit the threaded lower portion of the interior of fitting F, above the lowermost communication chamber [2b. A frusto-conical valve seat I211 'of small dimensions, is provided in fitting F just above the communication chamber I 2 b, disposed concentrically of the axial pase In. the; form shown, the lower end of this axial passage and extending internally of nipple 12a and exters nally and in packing relation; to'condui-t: '11: a. plu rality of collars or annular washers I8, I81; and lab respectively, the medial one of" which as shown, is constructed of compressible liduid ime pervious material.
To the upper end of conduit I1, a torque-receiving nipple I9 is rigidly aflixedirsaid nipple hay-*- ing a hexagonal, channeled base portion [9m which is surrounded by the loop of a metalstr'ap" 20, provided with co-axial apertures in the outer and opposing endsthereof;- forr'ec'eivi-ng an extensiblehandlerod 2F which alsofits the'channel of element- Isa for securingthehandleand strap in operative position for' applying torque-to the conduit FF. The handle ZI is provided with a non-conductive finger-piece 2 tw t its outer end and is also provided with st'op coilars 2 th? aridflflc located respectively at the opposite end and at an' intermediate-portion thereof; for limitin the" extended and retracted position of the handle relative tostrap 2B. I
The burner and entire superstructure is' s'up ported by nipple t9. To this end'ra" sl'e' eve' fitting Zihasthreadedi engagement at? 22awith the um per ortion of nipple l'9 'and is eniarged-atits'upsper" portion to provide a wick-receiving well 225' for holding suitablewick material" 2'3 about and surrounding the-medial portion of the generator tube 21: sleeve fitting 22* carries at its upper end; aspider basket comprising a'piuralitw of radially extending, horizontal arms 25 which have rigidly" attached tothe outer-ends thereof; upstanding arm pivoting, sl'eev'e'f 2521' wherein: the dependingshanks 26a; of" inverted? li-shape, IlliBIiSiI'SlIDPOItr ing a'rms' 26 are' -pivotally and slidab'ly'disposed.
An; u standing; arm anchoring finger 211" pro-' vided fbreach of the supporting arms 26; prefer-- ably, constructed of resilient material and having thei'r upper' ends 27in preferably bentinwardlyf and with the extremities or upper. edges notched at with an outwardly flared; lower extremity having aitruncated conical, terminal flange for tightly seating against the extremity'of nipple [9. Generator tube 24 is clamped to the nipple shown, by an overhanging}, annular flanges internally provided" on sleeve fitting 22 which engages the upper edge of the" flared, lo'wererrd of generator tube 214 Generator tube 2'4 is constructed of suitable meta'l'havin-g goodiheat conductive quali ties; such as bronze or'copper' and as shown, has mounted therein, aspira'lly disposed" wire or small. spring 24a, to restrict surging or flash-backs dur"- ing combustion of the burner: The upper end or generator tube 24; is internally'threaded to ro ceive and support the externally threaded lower end of a' burner tip- Z'Bt'proVided with the usual axial orifice 280'. Art internally threaded sleeve ZQiisithre'adedly'securedtotheupp'er'end'ofigener a-ton tube 24 and is disposed concentrically in pin 35; is adaptedt'o cfaiirrsthe memlienfl t'o the supporting bracket 36 ravenous angularpo je'cting plug member" 3B? which 7 extends from 4 spaced relation, as shown, to burner tip 28 and has afi'ixed to the upper end thereof, an open top, upwardly flaring, burner shell 30, which is provided in its peripheral wall and adjacent the bottom thereof, with a plurality of relatively large air intake passages 38a. A flame spreader plate H of slightly (ion'cavo-corivex shapeis mounted at thetop'of shell by suitable means such as radially projecting arms 3m which have doWn-. turned extremities for engagement with the upper edge, of shell-30: Flame spreader 3| is made of a suitable metal or other material which will withstand, high temperatures. A vertical, shieldingring 3 2'. supported on the outer ends of i spider; armsz'fi andfmay be slipped into operative position between the resilient fingers 2'! and the severalt'upstand'l'ngi arm pivoting sleeves -25a. Burner shell 38 is provided with a bottom drain port 366 to supply fuel for starting to wick 23, below. v I
The orifice fees "the turner tip:-
provided witha fine', axially disposed cleaning needle tee secured to the upperend of" the rigid',-- Vernon-,- restricting for? It.
Our improved construction includesa dilal pur pos ecylindrical caper shell of approximately the diameter of pressure tank m: and havin a: height sufiicient; when inverted, tar-accommodate the entire super-structure off our stove;- Thus when the-supportingarms 26 are sligntlylirted from their anchoring fingers and intur-ned in close relationshi to theburnersh ee; cap member. maybea plied as showni"r-1--F'igs.-"3 and l; to
, eiic'lose and protectthe entire burner struettird supporting basket, handle 2 i retracted to the dotted line positicnsncwn.) andparts connecting the tank wit theburner; provided with a dual -purpos'e anchoring means in Uh'SfGIIIlQf a U-shapect strap all, pivotedflon a" pin 35 which: passes through the ends of strap rnern-loer 3?; and having sic and pin engagement with pin for longit'u n'al a j ustme'nt. clampin nutj 35o threadedl-y engaging oneend of" sitionssuch as the attachment position shown Fi gfi 4r and-'the heri'aon'tal handle position shown in F'ig. 1. Theiooped, outer portion of u shaped strap ee is-ada ted to engageov'era laterally p medialheigh-totpressur'e 'tank" [is shown, tank In is, provided with a very of fi'eient type or pressure pump-indicated aspen en;
tirety By tnel'etterP. The pump assh'own; com-=" -pri's'es a horizontally: disposed? cylinder 31- hat/=13 adjacent itsinner end; With-a coarse-preferably piston and to furthermore, engage an interna threaded seat provided-lava horizontal -fitting; 3 j which is secured to the inner end of pump? cylinder 3?. The fitting 39 isprovide'dwitlii an axial which urged: inward-1y into engagement with the valve seat Silltbya coil spring 41 interposed between the closedfencfofltheplug and the outer endof piston 40'? Gap member" 33 1s a The horizontal fitting 39 further provided,
with a radial and inwardly. extendingjair dis: charge p'ort 38cwhich is in communication with an annulargroove39d formed in the medial portion of fitting 39.
The combination protective cap and cooking utensil 33 is preferably provided with a depend ingjclip 33am resilient material attached 'to the top' thereof and extending compactly against the peripheral wall, by which our entire stove, when encased for carrying, may be attached to a belt, loop or article of clothing worn by the user.
Operation From the foregoing description, it will be noted that the entire stove maybe very compactly collapsed and encased, forming a substantially cylindrical package with all parts of the device protected.
Our improved structure enables a highly efficient stove to be constructed, having a height in its compact form, of less than "7 /2 inches and a diameter of approximately 3 inches.
In utilizing our stove, the clamping nut 35a is released, the retaining member swung out of engagement with the plug 36a and the cap then removed from the stove proper. In doing this; the combination retaining member and handle 34 may be swung to a position radial of the cap 33.
The utensil-supporting arms 26 may then be swung outwardly in positions radial to the burner and lifted slightly and anchored in the notches 21b of retaining fingers 21. The valve regulating handle 2| may then be extended and turned slightly, whereupon gasoline or other hydrocarbon fuel from tank It, is forced by pressure, through the depending conduit [4, the lower end of which, it will be noted, is disposed adjacent the peripheral interior wall of the tank at its lower portion. The gasoline will be directed through the orifice 23a overflowing the annular dam about the burner and some thereof, will find its way downwardly through port 30b, along sleeve 29 and conduit 2%, to the wick 23 at the top of fitting 22. When a small amount of fuel has so accumulated, handle 25 may be turned to again'seat'the valve Ha against an'nularseat [2d at the lower end of the conduit H. The gasoline then may be ignited by a match and after burning for some time, will heat generator tube 24 sufficiently to boil the hydrocarbon fuel, whereafter the regulating valve may be opened by turning handle-2| and the mixture ignited at the orifice 0f the burner. The intensity of the flame may, of course, be controlled by regulation of handle 2| which applies torque to the valve-forming conduit I1. p
A frying pan or other cooking utensil may be supported above the burner and the radial arms 25 and distribution of intense heat from the flame is effected throughout a large area of the supin this connection, the pump plunger is first released by unscrewing the same from its threaded 6 inner end engagement with '*the"h'orizontal fitting 38. In disengaging theplunger fromstationary fitting the rounded threads 38a are in engagement with the several parts of the pump piston and the piston-may then be reciprocated to force air through the axial air port 39a, open-' ing the disc valvedfla and discharging air under pressure into the tank. Whenthe desired pressureis obtained, the plunger is again. thrust to its extreme inward position and. then' turned clockwise to again lock the threads 38a with fitting 39. In doing this, it will be noted that the inner extremity of plunger rod 38 is of conical formation, tightly fitting an annular valve seat, afforded by the axial passage or air port 39a of the fitting whereby a positive closure valve in addition to the check or disc valve 40a, is provided for sealing the air in the tank. It will of course be understood that the aperture in plug 31a and through which rod 38 works is sufficiently large to permit the supply of air from atmosphere to the pump cylinder'on the back stroke of the piston.
In lighting or starting our stove as well as in the normal operating combustion, the burner as well as starting wick 23, is shielded from wind by the simple expedient of the removable vertical shielding ring 32.
The said shielding ring 32 may be readily removed for cleaning and the interior of the burner shell may be readily cleaned by removing the flame spreader 3| from the upper edge of the shell.
From the foregoing description, it will be seen that we have provided an exceedingly compact sportsmans stove comprising a minimum number of parts associated and combined to have, in many instances, dual functions and providing for a complete encasing and protection of all working parts in a compact form for carrying or attachment to the apparel of the user.
It will of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts without departing from the scope of my invention.
What is claimed is:
A sportsmans stove having in combination a base, a burner structure supported on said base and projecting thereabove, radial outwardly projecting members carried by said burner structure in spaced relation below the upper portion thereof, upstanding sleeves carried by the outer ends of said members, L-shaped utensil supports having horizontal and vertical arms, the vertical arms being pivotally mounted in said sleeves for swinging movement of the horizontal arms into inwardly swung relation over said burner structure and for outwardly swung cooking vessel supporting relation projecting radially outwardly from said burner structure, and
retainers for anchoring said horizontal arms in outwardly swung relation, said retainers being of spring construction and being secured to said of said retainers as the horizontal arms are outwardly swung. I
EDWARD H. STEMPEL. SOPHUS RASMUSSEN.
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