CA2162297A1 - Multi-purpose, light-weight heating device - Google Patents
Multi-purpose, light-weight heating deviceInfo
- Publication number
- CA2162297A1 CA2162297A1 CA002162297A CA2162297A CA2162297A1 CA 2162297 A1 CA2162297 A1 CA 2162297A1 CA 002162297 A CA002162297 A CA 002162297A CA 2162297 A CA2162297 A CA 2162297A CA 2162297 A1 CA2162297 A1 CA 2162297A1
- Authority
- CA
- Canada
- Prior art keywords
- heating
- walls
- set forth
- oven
- heating chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/14—Stoves or ranges for gaseous fuels with special adaptation for travelling, e.g. collapsible
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/02—Stoves or ranges for gaseous fuels with heat produced solely by flame
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cookers (AREA)
Abstract
An all-metal, hand-portable, light-weight heating device serves as a self-contained oven, as a stove, or as a space heater. The box-like device comprises hollow sheet-metal back, side and tap walls and door. An enclosed heater chamber beneath the oven enclosure includes a removable, slide-in top closure plate, which channels hot air to the interior of the hollow walls when used as an oven or space heater; removal of the closure plate enables use of the device as a stove. The preferred material is sheet aluminum. A
portable gas bottle can be used as the fuel supply. Excess secondary air is available, induced by the operation of the gas burner. This induced flow of cool air creates a high thermal gradient between the inner and the outer heated wall surfaces, so that the outer surfaces of the device operate at a safe, non-searing temperature. The device can be used for camping, cook-outs, or for emergency situations, or for household use as a regular oven or stove in third world communities.
portable gas bottle can be used as the fuel supply. Excess secondary air is available, induced by the operation of the gas burner. This induced flow of cool air creates a high thermal gradient between the inner and the outer heated wall surfaces, so that the outer surfaces of the device operate at a safe, non-searing temperature. The device can be used for camping, cook-outs, or for emergency situations, or for household use as a regular oven or stove in third world communities.
Description
MULT I -F'UF;F'OGE , L I t~HT-~JE I C~HT HEAL' I h!G DEV I CE .
E~AGF::C~F,C7UhiD OF THE I NVE~!'r I ~i~l This invention is directed to a heating device, and in particular to a self-contained mufti-purpose, hand portable heating device that can be «sed as a cooking stove, as an oven, or- as a spaceheater.
DESG,Fi I F'T I t.Jl~1 CIF TWE PFi I OFi AFiT
Ther-a is a long history of effoats that have been made in the past to provide portabla coo~~ing apparatus.
Included in this are the following United Mates patents:
I?ahman: i58,C399 May i9s~4, which shows a k:nocE::-down oven having hollow walls for- purposes of insulation, held by removable snap fasteners; there appears to be no provision for air cir--culatian through the hollow walls;
Mc~r-i de: 1 , ~4b 1 , H8~? Jul y 19~:~, whi ch shows a removabl a oven havi ng hol 1 ow wal 1 s, f or- use over a stove burner-, wi thout any provision being made far- secondary and e:;cess air-, necessary for obtaining an effective thermal gradient between internal and e;:ternal oven surfaces, for- safety purposes;
Du k:es: ~,~~r5i',~i3 Oct.19~6, which shows a portable oven having an alcohol burner as its treat supply;
Horw;man: v, it i'', c~73~ Feb. 19:~ i', whi ch shows a pnr~tab 1 e, c:ann i ster-1 i k:e bake- .oven f or t~se wi th a gas or el ectr i c st ove;
Stanley: y,e:~ir,T-ii Apr. 193r, which shows a hollow wall oven f or- use upon an of 1 , gas or e1 ectr i c stove;
E~ar~tlebaugha :', 189,E3i ~ Feb. i94~:~, which shows a portable, hollow wal .1 ed oven havi ng a comp l e:; c i rcul atory ai r-- f 1 aw;
Fades: 2,5r=a1,9:~5 Mar.l~~r~a, which shows a portabla sheet metal oven far- use .aver an e:;ternal gas or ai 1 burner;
F::eel: Aug. 19&6 which shawl a portable camp stove toaster- hawing hol 1 ow wal 1 s;
Li tt 1 a et al : :~, KGB, Bra i' flar 196 i , wh i ch shows the wel 7.
k::nawn Coleman foldable oven far use aver a camp stave;
E~alls: 3,3~4,8i8 ~iav. 196, which shows a partab7.a range incarpor-ating a firebo;; and a variable thick::ness oven bottom Dahlquist: :~,U6i,92Feb. l9ir, which shows a dissassembleable portable oven, secured by threaded rods and wing-nuts;
~larman: 4, <a~l , 8~ r' Uct. 19 r -i , whi ch shows an outer and a separate inner casing for use upon a camp stove;
Noh: a, 1i~1,~'iW Apr. 199, which shows a gas eaok::er having a mec!-~anism permitting use as an oven ar as a grill.
In considering and comparing portable type ranges and ovens wi th orthoda:; k:i tchen appl i antes, i t shawl d be barn i n mi nd that whereas the regular appliances ine2ude interval insulation, sa as to lower the sides and back:: temperatures sufficiently to enable the appliance to be s~-~ndwiched safely against adjoining cupboards, the portable type of device is not so protected, mainly an the bases of weight, cast and lie, and thereby, in the foregoing prior art embodiments, these operate at high surface temperatures, and require significant peripheral safety clearances to reduce the ranger of f i r--e ar-- i n jury , as they da not i ncarporate ai r coal i ng.
h While many of the ~ppear~ance ch~r-wcteristics of the present invention can be seen in the foregoing prior ~r~t, theme is na pr-iar tez~ching to le d one to provide the safety char~aoterwistics, partioul~r~ly ~~ relatively coal, ~ir~--cooled outer casing, that give the present i nvent i an i ts> une.; petted ch~r~acter~ and capabi 1 i t i es.
>.~UI"IMAF~Y OF THE ThfVENTIC1IV
It has rreen faL!nd that hat gas end coal o!!tside sir can be pissed from ~ heating chamber into a hallow w~11 strwcture such that one surface of the hallow w~11 structure is foe~ted to a high temper~t!.tre, while the ~d.j~cent other wall s!.!face is maintained at a substantially lower temperature, thereby establishing a stable, high ther~m~l gradient between adj~-~cent portions of ~ hallow wall.
The prwesent i nver!ti an pravi des a sel f--contai ned , hand-por~t~bl a light-weight, mufti-purpose heating device that may be used as a self-contained av~en, as a stave, ~.nd ~s a spaceheater.
The present device has hallow walls, which include the top of the ba;;-1. i k:e oven structure, that ire prefer-~-!bl y of sheet ~1 umi num, both far lightness end far high heat conductivity.
The hallow wills have internal connecting passagewE-!ys, farming mutually balanced canvectional flaw paths e;;tending upwards through the walls, and extending fr~am below the oven enclosure to ~n outlet gone located in the top will outer surface.
E:reneG~tl-! the oven ther--e is ~n enclosed heating ch~-~mber~, which cant~ins the inlets to the w~11 flaw paths, and the heat source, pr~ef erwla l y a gas burner . Al so, s!.!bst ant i al l y unobstructed ai r access is provided, referred to below.
".E
!=our supporting feet e:,tend beneath the heating chamber, mai nt ai ni ng the bottom of the heati ng chamber- wel 1 c 1 ear- of the supporting surface, for- ample air access and tn enable safe use of the device out of doors, even capon grassy surfaces.
t~ther~ forms of beating may also be !!tili~ed, including electrical elements, provided that the secondary and e::cess air supply is maintained, to assure ind~!ctive flow cooling of the outer walls.
The structure includes a reflective and pr--otective tray below the b~lrwer. The structure compri<~es three walls, a top, and a front with a dnor-, all of which readily assemble in mating re3ation, as a substantially cubic bo:,-lik:e construction. ~Jhen used as an oven the bottom closure sheet is inserted; a gas bottle connects with a removable b!.lrner- and its shielded mounting bar, to provide a high efficiency, clean-burning and safe appliance.
The component parts form a light--weight, compact package that is r--eadily traps>por-ted.
l-he walls and top of the device are hollow, being assembled in mutual, overlapped relation where their edges ad..ioin.
The device is arranged to achieve e::tremely clean burning, normally without the generatibn of carbon mono:;ide.
'l~he aehi evement of a hi gh thermal gradi ent between the i nner-- and the outer heated s!!rfaces enables the ,~!.!ter~ surface to operate at a safe, substantially lower temper-at~!re than the internal oven temperature. A burner mounting bar in combination with its underl ying heat shield provides a sofa support -For- the gas burner.
The structure ~.~ide walls incli!de supporting foot mear7s, to support the str!_!cture i n stabl a spaced r-el at i an upon a supparti ng surf ace, and to pravi de f ul 1 y ~deq~!ate ai r- access.
l-he de vi ce al so may be used over an e:; i st i ng gas r-i ng .
~Jse with polluting heat sol.!rces such as an open fire is sat recommended, due to probable fa!.!ling of interior passages.
The heating chamber has substantially unrestricted air access below i=he bottom edge of the hallaNa walls far floe unimpeded i ngr-ess of cambusti an ai r-- and ~ecandar~y coal i ng ai r .
A withdrawable closure sheet substantially isolates the head ng chamber- f r~am the oven i nter-i ar-, and when i. nser--ted i. n position serves to guide the hat gases and the induced flaw of secondary, cooling air to the stacked inlets of the interior~
convection -flaw paths, inside the walls.
It appearws prwabable that the hot combustion gases initially flaw upwardly aver the enclaced vertical surfaces of the inner 4aa1 1 s, whi 1 a the i educed f 1 aw of secondary, coal i ng ai r- most 1 y blankets the intervening interior space to the vertical outer wall portions, thereby creating a steep temperatur--e gradient, and mai ntai ns rel ati vel y cool the outer wal 1 s~.!r-f aces.
As a consequence the e;;ternal surface temperat!..!re of the device is normally about one q~!arter that of the interior, oven walls. Th~.!s, at e::tr-eme oven temperatures as highs as ~r!:~!=y F. degrees the e;.teriar s!.!rfaces da not nar-mally e~:reed about t5~~
F.a i.e. it does sat char paper- ar reach a flesh-searing heat;
and at normal oven cooking ternper-at~!r-es, in the ~!Jij F range, the e;;teriar wall temper-atur-e is abo!..!t 1~f:~ F., i.e. it can be briefly touched q at the 1 i mi t of camf art.
l~)hen used as a stove, having the door open and the closure street removed, the hot gases pass directly from the heating chamber- c.!p i nta the oven space, and es; i t through the open door, substantially by-passing the interior--wall passages, and 1 eavi ng the e;~-~.teri nr- surf aces of the devi ce q~.!i to coal. . The provision of e;;cess air- ensures e;;tremely clean burning, normal 1 y wi thaut the gener-at i an of carbon mono;; i de.
Thus there is provided a heating device inc:arparating a heat generat i ng means; a ba:.-1 i k:e enc 1 asur-e havi ng si de, bac hand top hallow walls and a daarR the walls and tnp having internal cannectir~g air vent passages far upward passage of heated gases therethrough, the tap wall outer surface being vented to atmasphere9 a heating chamber ventilated to atmospherwe located beneath the enclas!!re and separated therefrom by a closure sheep; the heating device and vent inlets to the air- vent passages being located within the heating chamber- whereby, in use, substantially balanced, uni-directional canvectianal flaw of hot ai r and cool i ng ai r i s obt ai ned tt-~r-a!.!gh the wal 1 s and tf ie top of the devi ce, to pr-ovi de a steep thermal gr-adi ent , and a rel at i vel y 1 ow outsi de surf ace temperat!.!r-e.
The present invention thus provides a light-weight hand-par-table, mufti-purpose heating device comprising: a ba:;lik:e enclosed str-uct!.lre having an access door- giving access to an upper oven chamber portion of the device; a heating chamber- beneath the upper- chamber- a the per-i pheral wal 1 s of the heat. i ng chamber havi ng b hollow nipper- wall portions, with apertures providing airw flaw access from within the heating chamber to the interior of the hollow walk, and lower- wall portions giving 4cnimpeded access to ot-~tside atmosphere, to admit excess sir to the heating chamber" a heating means located within the heating chamber-; end ~ closure plate subst~nti~lly separ-~7ting the upper- chamber from the heating chamber and serving in use to deflect hot gas in heating relation and induced ~~ir- flaw in cooling relation into the hallow wal k , to establish a high thermal gradient then--ein, wherein the inner w~11 surfaces of the hollow wells are ~t a high temper~.~tstr-e, end the outer- will s~ ~r-f aces of the hal 1 ow w~l 1 s .~r-e at a substant i ~1 1 y coal er temperature. The L~TIJ rating of the device depends upon the rwated flow capacity of the gas admission orifice, such that by selecting an orifice of unduly large BTU c~p~city the desirahle safe e::ternal temper~atur~es may be e;<ceeded.
For bath safety and comfort the device is best iac~ted to provide acceptable safety clearances, such as ~baut three inches peripheral clear~~nce.
In use, the radiant and canvectional heat gener-~ted by the device will heat the local environment.
Cln grounds of safety, ~n ~dequ2te supply of outside fr~esh ~ir-should always be assured, when using the device in an enclosed space such as i ndaor-s ar i n a trai 1 er--, to pr--avi de about :~6 square inches of opening to outside ~.~tmasphere. Also, a chimney for hot gases is adviseable far indoor- use, due to the i carbon dio:;ide being generated.
The structure has suppar~ting foot means attached to the side walls of the devi ce.
In use as a range, having the doorw in a lowered pa~itiorv gives unhindered access to the interior of the device, and a removable grwill mesh provides support far cao6::ing and heating utensils, such as N::ettles, saucepans and fry--pans in direct contact with the burner flame. In such use, the e:;cess heated air and e~:haust gases tend to leave the interior of the device primarily by way of the open door, togetfnerw with steam and other vapour, so that the temperatLrre of the outer casing surwf ace r ~emai ne camparat i vel y 7. aw, and 1 i tt 1 a ai r f 1 aw occurs in the walls.
Fares use as an oven, the bottom closure sheet is inserted in superposed relation with the burner, in virtual. sealing relatiar~ with the oven, to isolate the head ng chamber beneath the oven. There the available copious supply of secondary airy ensures complete combustion of the fuel within the heating chamber, while promoting the induced flow of cooling air aver the i nteri ores s~.erf aces of the outer wa1 1 .
The closure sheet serves as a batfle and is heated directly by the burner, thereby pr~crvidi~tg radiant heat to the oven.
The hat r_ombustian gases, together with a significant volume of indur_ed secondary air C-~re guided by the closure sheet to the adJaining air passage inlets, which are located high up within the heating chamber.
Tt appears that the hot gases are in substar7tially stratified r~el ati vn wi th the i nduced f 1 aw of outsi de coal ai r , whereby a hi. gh thermal gradient is established.
The gases pass through the respective walls in mutually balanced flow relation to the e::haust vent located in the top outer surface of the oven.
Use of the device in a totally enclosed area, or one with i nadequate f rash ~-ti r suppl y i s not advocated. In such instances, the use of a chimney to conduct away the oven and heater hot e:; i t gases i s strwongl y recommended, to avoi d bui 1 d-up of carbon di a;; i de. Despi to such recommended e;,haust i ng of the hat combustion and secondary air, the device retains a relatively higi-~ efficiency, both as an oven and as a stove.
It will be under-~stvod that the device may be used with piped natural gasp bottled propane ar natural gas, ar other suitable comb~.cstible gas sources, while an electrical heating element may also be used.
In an embodiment featuring the oven, having appro:,imate dimensions of lr-inches width, lay 1:~-inches depth, by 18-i ncl-~es hei ght , and made of 18-gauge ~l umi num sheet i ng , the device weighs 1&-lbs and is readily 1-~and--carried by an average adult.
E~Fv 1 EE DE~CFv I F'T I 01~ OF THE DRAW T hff~~
~erwtain embodiments of the invention are described by way of illustration, without limitation of the invention thereto other than as set forth in the accompanying claims, reference r.w., bei 'ng made to the ~acampanying dra!~aings, wherein;
Figure 1 is ~ perspective view from above of a Beating device ~coor-di ng to the present i nventi an , the door- bei ng omi i~ted;
Fig!-!r-e ~ is a front perspective view from off-centerw of the subaect device, having the elements thereof in e;;pladed r-elatiana Fi g~_!r--e 3 i s a f rant perspect i ve vi ew of the f rant panel ~~nd daor of the device;
Figure ~ is ~.n inside view in perspective of the tap of the s~,!b jec i~ devices Fig!-!re ~ is an inside view, in perspective of ~. side w~17. tthe gas inlet side) of the device; and, Fi gore 6 i s ~ per sped i ve vi ew of the i nsi de of ti- a rear- w~l 1 of the devi ce.
DETi-'~ 1 t_E~I7 DE:SCF T ~'T 1 Olvl QF 1-HE I NVENT 1 C?N
Fiefer-ri ng to Fi gore 1 , the "cube-1 i k:e" head ng devi ce 12 i s Shawn i n i is ~ssembl ed state, h~-!v~. ng the door- thereof r-wmoved f or ease of i 11!-!s'~r~tian.
Fief err--i ng to both F i gl.!r-e 1 and Fi gG!re ", the i 1 1 ustr-wted devi ce 1~
comprises left-side w~11 pardon 14g right-side wall portion ib;
r--e~r- w~-!11 portion 18; fror5t wall portion ~y!-3 end door portion ~;
tap portion "'4~: b!!rner support bar- ~b; b!!rner 2~3 and control valve '~c~~. ~l gas batt 1 a tnat Shawn ) ~~yay be connected to the control v~l ve :3!?. The door- pard on ~~ his ~ hand l a ~' .
The device 1~ is elevated upon feet 19, depending from side walls 14 and ib.
l-he si de w~l 1 s 14, 16 each his ~ recess '~1 , ~3 ad j~.~.cent thei r 1!i 5.....5~~..
front edges tsee F=ig!~r~es ~. and ~i7 into which arwe inserted the protruding end portions ~5 of the franc wall porwtian ~r~~. The side walls 1~., 1.b also have veri_ical recesses 41 e:;tending the full length of their rear edges, which receive the ad~laining edges of the rear wall portion it3 in inserted relation therein. In the i 1 1 castrated embad i ment si :; p i votal l atches 1. i , of wh i ch f our can be readily seen, and theirw associated headed latch pinss 1i', secure the tap and the front wall portions :~'~, ~r~~ respectively to the si de wal 1 s 14, 1b.
The frar7t wall par~tian 'i3 has a viewirrg apertc.cre ~9 through which the Flame setting of the burner ~8 can be viewed.
A pivotally mounted cover plate ~9'precludes blow-out.
The burner suppar-t bar ~~ fiis within rectangular blind r-~ecesses ~E~ ' 1 acated i n mutual. 1. y al i gned rel at i on ad jai n i ng the bottoms of the respective rear wall 1~3 and the front wall 2<a. The burwnerw support bar "~'6 has a ref 1 ectarlshi el d pl ate '~1 secured therebeneath, e:,tending beneath the burner ~~~ to shield from any undue heating the surface upon which the device 1? may stand. The plate '~1 may be of significantly larger area.
A withdrawable closure-sheet ~~ is shown in F=ig!rre i, being inserted, as illustrated to close--off the underlying combustion chamberw gone 3:~ tpartially indicated by a Batted line in Figure ~:') when the device 1'~ is in use as an oven or space heater.
F,ef err i ng to Fi gores i and Vii, the si de wal 1 port i ons I ~, 1 fa each t-,ar~ a lower rack: support 3~ of U-section, and an upper rack:
support 3i of L-section.
1-he 1 awes 1 egs of supports 3~ s!..lpport the c 1 osure-sheet ~, when it is slid~bly inserted far use of the device 1~ ~s an oven ar ~s sp ce he~.ter~; the upper legs of supports 35 support a grill rack:
(not sl-~own > of the usual gadded type, when the devi ce 1 ~ i s used as c~ stove.
A thr--e~ded r-ecept~cl a :~sz' secured to the si de ib recei ves the control valve :~f~ in hind-tightened secured rel~~tion. The supply pi pe of burner ?8 i s s1 i d i nto the r-ecept~cl a :~~'~' i n connected relation with the control valve The upper- r-~ck: supports ~i may be used with the grill rack: ~s an !_!pper shelf far- purposes of b~k:ing in the oven. Fief erring also to Figures 4, ~ end b, the side walls 14, ib end the r-e~r- wall 18 h~~ve inlet apertures ~4, 36, ~8, which lie within i=he cambusti an ch~mber~ one :~~. These i nl et ~per-tures connect wi th the hallow interiors of the respective walls 14, ib and 18.
The walls 14, ib, end 18 have upper outlet apertures The tap -~4 tFigure 4) his a per-ipher-c~l skirt portion 40, farming with the hollow central portion 4~' a channel ~3 into which the upper portions of -the side z-~nd rear- walls 14, ib and 18 e;;tend.
The i nner surfaces of the b~c:k: and si des of channel ~~ have i nl et openings 44, 4b that are in registry with the outlet apertures :~9 of the wills 14, ib end 18.
-The tap :'4 (Fi gure 1 7 has ~n out 1 et vent ~ catnpri si ng a number of small ~pertur-es in its upper- surface.
Tn Figure '~ there is illustrated a protective saver 5!0, to prevent accidental (or deliberate? covering of the cutlet vent ~.'~, which s~~.~. ;' 3E.
might result in incomplete combustion, and possibly, in the generati on of carbon mono:; i de.
l'he device 1~ is assembled, with the rear wall i8 enterwed into the slots 4i of the two side walls 14, ib. The front end of the bur~r~ter~ support bares ~f~ i s 1 orated i n the bl i nd aperture ~6' 1 orated on the inside fbottorn) of the front wall The rear end of the burner support bares r.~6 i s l orated i n the aperture ~6' located on the inside (bottom) of the rear wall 18, and the front wa1 1 ~Ca has i is end porwti ons ':"5 1. orated wi ti-~i n the recesses ~1. The top ~~ sits in encompassing relation with the walls 14, ib and the back: 1~, so that the interwnal convection passages thereof are in registry.
The components are held by latches ii, to secure the assembly.
Tt is evident that the assembly may be riveted. In use, with the closure sheet :~~ positioned on rack: support :~5, thereby cl.osi.ng of f the combusti on chamber one ~:~, wherei n are 1 orated the ci reul ati on i nl et apertures 34, ~~r, .'38, the operwat i on of burwner ~W
causes floe upward passage of combustion gases through the !tpper~
row of the inlet apertures 34,3b, ~8 upwardly along the inner wall interior surface, to heat the adjoining oven space, by radiation and convection. The lower rows of aper~tur°~es 34, 3~, '~B admit an induced flow of cool secondary and e:;cess air into the interior of the walls, to blanket the hot gases, thereby estab).ishing a steep thermal gradient across the thick:nes of the walls, between the inside and the outside of the hollow walls, to maintain relatively coal the outer oven surfaces. The rising gases pass laterally through the interconnecting apertures ~9, 44 end 46, into the hol 1 ow central porti an 4~ of the tap ~4, to er, i t to ~-~tmaspher-e by way of the outlet vent 25.
in addition to the use of gas in battled ar other- farm as fuel, the use of a n~.~phtha gas generator- of the well-known Coleman (Tr-wdemar-v: ) type i s a1 sa passi b1 e.
A thermometer may be readily set in the front face of the char '~.
The use of a si rnp 1 a chi mney secured aver- the vent ~~.r by way of simple siat-and-tag provisions is contemplated. The protective b~r~r-ier ~to which m~.y be provided, ~s spawn in Figure : only, to prey 1 ude acc i dental b 1 ac k: i ng of f of the vent ~~, may be p~r-f orated and str-~dd1 ed by such ehi mney, or atl-ier-wi se removed to f ~-~c i 1 i tote chimney attachment. However, retention of barrier ~t~~ is preferred an grounds of safety. It ie contemplC~ted that the subject walls and back:: portions of the device may be e:: tended downw~r~dly to form storm skirt, for- use outdoor--s under windy car~ditians. E~y ampl y perforating such sk:ir-t to ensure fully adequate, e:;cess air ventilation, the skirt may taN::e the place of the feet i.9.
For pur-pases of lightness, law cast, ther-m~~l characteristics, nan-a;;id~tian ar c~r--bani:~atian, the use of aluminum sheeting far the m~_iar- sur~f~~ces is preferred. Sheet tin may al sa prove satisfactory.
GC7MMEhG 1 AL UT 1 L 1 TY
t~ widespread m~rk:et far this new product is envisaged, including r-ecr~eatican.~l use such as c~.~mping and coo6::-ants; domestic camplement~ry caok:ing, and emerwgency coaN::ing and supplemental , incidental heating in case of disaster s~.~r_h as earwthquak:es, war etc; Al sa, farwse i n f i r~e-f i ghter~ camps q and far mi 1 i tar~y ~.~se~
i~
,.~';
E~AGF::C~F,C7UhiD OF THE I NVE~!'r I ~i~l This invention is directed to a heating device, and in particular to a self-contained mufti-purpose, hand portable heating device that can be «sed as a cooking stove, as an oven, or- as a spaceheater.
DESG,Fi I F'T I t.Jl~1 CIF TWE PFi I OFi AFiT
Ther-a is a long history of effoats that have been made in the past to provide portabla coo~~ing apparatus.
Included in this are the following United Mates patents:
I?ahman: i58,C399 May i9s~4, which shows a k:nocE::-down oven having hollow walls for- purposes of insulation, held by removable snap fasteners; there appears to be no provision for air cir--culatian through the hollow walls;
Mc~r-i de: 1 , ~4b 1 , H8~? Jul y 19~:~, whi ch shows a removabl a oven havi ng hol 1 ow wal 1 s, f or- use over a stove burner-, wi thout any provision being made far- secondary and e:;cess air-, necessary for obtaining an effective thermal gradient between internal and e;:ternal oven surfaces, for- safety purposes;
Du k:es: ~,~~r5i',~i3 Oct.19~6, which shows a portable oven having an alcohol burner as its treat supply;
Horw;man: v, it i'', c~73~ Feb. 19:~ i', whi ch shows a pnr~tab 1 e, c:ann i ster-1 i k:e bake- .oven f or t~se wi th a gas or el ectr i c st ove;
Stanley: y,e:~ir,T-ii Apr. 193r, which shows a hollow wall oven f or- use upon an of 1 , gas or e1 ectr i c stove;
E~ar~tlebaugha :', 189,E3i ~ Feb. i94~:~, which shows a portable, hollow wal .1 ed oven havi ng a comp l e:; c i rcul atory ai r-- f 1 aw;
Fades: 2,5r=a1,9:~5 Mar.l~~r~a, which shows a portabla sheet metal oven far- use .aver an e:;ternal gas or ai 1 burner;
F::eel: Aug. 19&6 which shawl a portable camp stove toaster- hawing hol 1 ow wal 1 s;
Li tt 1 a et al : :~, KGB, Bra i' flar 196 i , wh i ch shows the wel 7.
k::nawn Coleman foldable oven far use aver a camp stave;
E~alls: 3,3~4,8i8 ~iav. 196, which shows a partab7.a range incarpor-ating a firebo;; and a variable thick::ness oven bottom Dahlquist: :~,U6i,92Feb. l9ir, which shows a dissassembleable portable oven, secured by threaded rods and wing-nuts;
~larman: 4, <a~l , 8~ r' Uct. 19 r -i , whi ch shows an outer and a separate inner casing for use upon a camp stove;
Noh: a, 1i~1,~'iW Apr. 199, which shows a gas eaok::er having a mec!-~anism permitting use as an oven ar as a grill.
In considering and comparing portable type ranges and ovens wi th orthoda:; k:i tchen appl i antes, i t shawl d be barn i n mi nd that whereas the regular appliances ine2ude interval insulation, sa as to lower the sides and back:: temperatures sufficiently to enable the appliance to be s~-~ndwiched safely against adjoining cupboards, the portable type of device is not so protected, mainly an the bases of weight, cast and lie, and thereby, in the foregoing prior art embodiments, these operate at high surface temperatures, and require significant peripheral safety clearances to reduce the ranger of f i r--e ar-- i n jury , as they da not i ncarporate ai r coal i ng.
h While many of the ~ppear~ance ch~r-wcteristics of the present invention can be seen in the foregoing prior ~r~t, theme is na pr-iar tez~ching to le d one to provide the safety char~aoterwistics, partioul~r~ly ~~ relatively coal, ~ir~--cooled outer casing, that give the present i nvent i an i ts> une.; petted ch~r~acter~ and capabi 1 i t i es.
>.~UI"IMAF~Y OF THE ThfVENTIC1IV
It has rreen faL!nd that hat gas end coal o!!tside sir can be pissed from ~ heating chamber into a hallow w~11 strwcture such that one surface of the hallow w~11 structure is foe~ted to a high temper~t!.tre, while the ~d.j~cent other wall s!.!face is maintained at a substantially lower temperature, thereby establishing a stable, high ther~m~l gradient between adj~-~cent portions of ~ hallow wall.
The prwesent i nver!ti an pravi des a sel f--contai ned , hand-por~t~bl a light-weight, mufti-purpose heating device that may be used as a self-contained av~en, as a stave, ~.nd ~s a spaceheater.
The present device has hallow walls, which include the top of the ba;;-1. i k:e oven structure, that ire prefer-~-!bl y of sheet ~1 umi num, both far lightness end far high heat conductivity.
The hallow wills have internal connecting passagewE-!ys, farming mutually balanced canvectional flaw paths e;;tending upwards through the walls, and extending fr~am below the oven enclosure to ~n outlet gone located in the top will outer surface.
E:reneG~tl-! the oven ther--e is ~n enclosed heating ch~-~mber~, which cant~ins the inlets to the w~11 flaw paths, and the heat source, pr~ef erwla l y a gas burner . Al so, s!.!bst ant i al l y unobstructed ai r access is provided, referred to below.
".E
!=our supporting feet e:,tend beneath the heating chamber, mai nt ai ni ng the bottom of the heati ng chamber- wel 1 c 1 ear- of the supporting surface, for- ample air access and tn enable safe use of the device out of doors, even capon grassy surfaces.
t~ther~ forms of beating may also be !!tili~ed, including electrical elements, provided that the secondary and e::cess air supply is maintained, to assure ind~!ctive flow cooling of the outer walls.
The structure includes a reflective and pr--otective tray below the b~lrwer. The structure compri<~es three walls, a top, and a front with a dnor-, all of which readily assemble in mating re3ation, as a substantially cubic bo:,-lik:e construction. ~Jhen used as an oven the bottom closure sheet is inserted; a gas bottle connects with a removable b!.lrner- and its shielded mounting bar, to provide a high efficiency, clean-burning and safe appliance.
The component parts form a light--weight, compact package that is r--eadily traps>por-ted.
l-he walls and top of the device are hollow, being assembled in mutual, overlapped relation where their edges ad..ioin.
The device is arranged to achieve e::tremely clean burning, normally without the generatibn of carbon mono:;ide.
'l~he aehi evement of a hi gh thermal gradi ent between the i nner-- and the outer heated s!!rfaces enables the ,~!.!ter~ surface to operate at a safe, substantially lower temper-at~!re than the internal oven temperature. A burner mounting bar in combination with its underl ying heat shield provides a sofa support -For- the gas burner.
The structure ~.~ide walls incli!de supporting foot mear7s, to support the str!_!cture i n stabl a spaced r-el at i an upon a supparti ng surf ace, and to pravi de f ul 1 y ~deq~!ate ai r- access.
l-he de vi ce al so may be used over an e:; i st i ng gas r-i ng .
~Jse with polluting heat sol.!rces such as an open fire is sat recommended, due to probable fa!.!ling of interior passages.
The heating chamber has substantially unrestricted air access below i=he bottom edge of the hallaNa walls far floe unimpeded i ngr-ess of cambusti an ai r-- and ~ecandar~y coal i ng ai r .
A withdrawable closure sheet substantially isolates the head ng chamber- f r~am the oven i nter-i ar-, and when i. nser--ted i. n position serves to guide the hat gases and the induced flaw of secondary, cooling air to the stacked inlets of the interior~
convection -flaw paths, inside the walls.
It appearws prwabable that the hot combustion gases initially flaw upwardly aver the enclaced vertical surfaces of the inner 4aa1 1 s, whi 1 a the i educed f 1 aw of secondary, coal i ng ai r- most 1 y blankets the intervening interior space to the vertical outer wall portions, thereby creating a steep temperatur--e gradient, and mai ntai ns rel ati vel y cool the outer wal 1 s~.!r-f aces.
As a consequence the e;;ternal surface temperat!..!re of the device is normally about one q~!arter that of the interior, oven walls. Th~.!s, at e::tr-eme oven temperatures as highs as ~r!:~!=y F. degrees the e;.teriar s!.!rfaces da not nar-mally e~:reed about t5~~
F.a i.e. it does sat char paper- ar reach a flesh-searing heat;
and at normal oven cooking ternper-at~!r-es, in the ~!Jij F range, the e;;teriar wall temper-atur-e is abo!..!t 1~f:~ F., i.e. it can be briefly touched q at the 1 i mi t of camf art.
l~)hen used as a stove, having the door open and the closure street removed, the hot gases pass directly from the heating chamber- c.!p i nta the oven space, and es; i t through the open door, substantially by-passing the interior--wall passages, and 1 eavi ng the e;~-~.teri nr- surf aces of the devi ce q~.!i to coal. . The provision of e;;cess air- ensures e;;tremely clean burning, normal 1 y wi thaut the gener-at i an of carbon mono;; i de.
Thus there is provided a heating device inc:arparating a heat generat i ng means; a ba:.-1 i k:e enc 1 asur-e havi ng si de, bac hand top hallow walls and a daarR the walls and tnp having internal cannectir~g air vent passages far upward passage of heated gases therethrough, the tap wall outer surface being vented to atmasphere9 a heating chamber ventilated to atmospherwe located beneath the enclas!!re and separated therefrom by a closure sheep; the heating device and vent inlets to the air- vent passages being located within the heating chamber- whereby, in use, substantially balanced, uni-directional canvectianal flaw of hot ai r and cool i ng ai r i s obt ai ned tt-~r-a!.!gh the wal 1 s and tf ie top of the devi ce, to pr-ovi de a steep thermal gr-adi ent , and a rel at i vel y 1 ow outsi de surf ace temperat!.!r-e.
The present invention thus provides a light-weight hand-par-table, mufti-purpose heating device comprising: a ba:;lik:e enclosed str-uct!.lre having an access door- giving access to an upper oven chamber portion of the device; a heating chamber- beneath the upper- chamber- a the per-i pheral wal 1 s of the heat. i ng chamber havi ng b hollow nipper- wall portions, with apertures providing airw flaw access from within the heating chamber to the interior of the hollow walk, and lower- wall portions giving 4cnimpeded access to ot-~tside atmosphere, to admit excess sir to the heating chamber" a heating means located within the heating chamber-; end ~ closure plate subst~nti~lly separ-~7ting the upper- chamber from the heating chamber and serving in use to deflect hot gas in heating relation and induced ~~ir- flaw in cooling relation into the hallow wal k , to establish a high thermal gradient then--ein, wherein the inner w~11 surfaces of the hollow wells are ~t a high temper~.~tstr-e, end the outer- will s~ ~r-f aces of the hal 1 ow w~l 1 s .~r-e at a substant i ~1 1 y coal er temperature. The L~TIJ rating of the device depends upon the rwated flow capacity of the gas admission orifice, such that by selecting an orifice of unduly large BTU c~p~city the desirahle safe e::ternal temper~atur~es may be e;<ceeded.
For bath safety and comfort the device is best iac~ted to provide acceptable safety clearances, such as ~baut three inches peripheral clear~~nce.
In use, the radiant and canvectional heat gener-~ted by the device will heat the local environment.
Cln grounds of safety, ~n ~dequ2te supply of outside fr~esh ~ir-should always be assured, when using the device in an enclosed space such as i ndaor-s ar i n a trai 1 er--, to pr--avi de about :~6 square inches of opening to outside ~.~tmasphere. Also, a chimney for hot gases is adviseable far indoor- use, due to the i carbon dio:;ide being generated.
The structure has suppar~ting foot means attached to the side walls of the devi ce.
In use as a range, having the doorw in a lowered pa~itiorv gives unhindered access to the interior of the device, and a removable grwill mesh provides support far cao6::ing and heating utensils, such as N::ettles, saucepans and fry--pans in direct contact with the burner flame. In such use, the e:;cess heated air and e~:haust gases tend to leave the interior of the device primarily by way of the open door, togetfnerw with steam and other vapour, so that the temperatLrre of the outer casing surwf ace r ~emai ne camparat i vel y 7. aw, and 1 i tt 1 a ai r f 1 aw occurs in the walls.
Fares use as an oven, the bottom closure sheet is inserted in superposed relation with the burner, in virtual. sealing relatiar~ with the oven, to isolate the head ng chamber beneath the oven. There the available copious supply of secondary airy ensures complete combustion of the fuel within the heating chamber, while promoting the induced flow of cooling air aver the i nteri ores s~.erf aces of the outer wa1 1 .
The closure sheet serves as a batfle and is heated directly by the burner, thereby pr~crvidi~tg radiant heat to the oven.
The hat r_ombustian gases, together with a significant volume of indur_ed secondary air C-~re guided by the closure sheet to the adJaining air passage inlets, which are located high up within the heating chamber.
Tt appears that the hot gases are in substar7tially stratified r~el ati vn wi th the i nduced f 1 aw of outsi de coal ai r , whereby a hi. gh thermal gradient is established.
The gases pass through the respective walls in mutually balanced flow relation to the e::haust vent located in the top outer surface of the oven.
Use of the device in a totally enclosed area, or one with i nadequate f rash ~-ti r suppl y i s not advocated. In such instances, the use of a chimney to conduct away the oven and heater hot e:; i t gases i s strwongl y recommended, to avoi d bui 1 d-up of carbon di a;; i de. Despi to such recommended e;,haust i ng of the hat combustion and secondary air, the device retains a relatively higi-~ efficiency, both as an oven and as a stove.
It will be under-~stvod that the device may be used with piped natural gasp bottled propane ar natural gas, ar other suitable comb~.cstible gas sources, while an electrical heating element may also be used.
In an embodiment featuring the oven, having appro:,imate dimensions of lr-inches width, lay 1:~-inches depth, by 18-i ncl-~es hei ght , and made of 18-gauge ~l umi num sheet i ng , the device weighs 1&-lbs and is readily 1-~and--carried by an average adult.
E~Fv 1 EE DE~CFv I F'T I 01~ OF THE DRAW T hff~~
~erwtain embodiments of the invention are described by way of illustration, without limitation of the invention thereto other than as set forth in the accompanying claims, reference r.w., bei 'ng made to the ~acampanying dra!~aings, wherein;
Figure 1 is ~ perspective view from above of a Beating device ~coor-di ng to the present i nventi an , the door- bei ng omi i~ted;
Fig!-!r-e ~ is a front perspective view from off-centerw of the subaect device, having the elements thereof in e;;pladed r-elatiana Fi g~_!r--e 3 i s a f rant perspect i ve vi ew of the f rant panel ~~nd daor of the device;
Figure ~ is ~.n inside view in perspective of the tap of the s~,!b jec i~ devices Fig!-!re ~ is an inside view, in perspective of ~. side w~17. tthe gas inlet side) of the device; and, Fi gore 6 i s ~ per sped i ve vi ew of the i nsi de of ti- a rear- w~l 1 of the devi ce.
DETi-'~ 1 t_E~I7 DE:SCF T ~'T 1 Olvl QF 1-HE I NVENT 1 C?N
Fiefer-ri ng to Fi gore 1 , the "cube-1 i k:e" head ng devi ce 12 i s Shawn i n i is ~ssembl ed state, h~-!v~. ng the door- thereof r-wmoved f or ease of i 11!-!s'~r~tian.
Fief err--i ng to both F i gl.!r-e 1 and Fi gG!re ", the i 1 1 ustr-wted devi ce 1~
comprises left-side w~11 pardon 14g right-side wall portion ib;
r--e~r- w~-!11 portion 18; fror5t wall portion ~y!-3 end door portion ~;
tap portion "'4~: b!!rner support bar- ~b; b!!rner 2~3 and control valve '~c~~. ~l gas batt 1 a tnat Shawn ) ~~yay be connected to the control v~l ve :3!?. The door- pard on ~~ his ~ hand l a ~' .
The device 1~ is elevated upon feet 19, depending from side walls 14 and ib.
l-he si de w~l 1 s 14, 16 each his ~ recess '~1 , ~3 ad j~.~.cent thei r 1!i 5.....5~~..
front edges tsee F=ig!~r~es ~. and ~i7 into which arwe inserted the protruding end portions ~5 of the franc wall porwtian ~r~~. The side walls 1~., 1.b also have veri_ical recesses 41 e:;tending the full length of their rear edges, which receive the ad~laining edges of the rear wall portion it3 in inserted relation therein. In the i 1 1 castrated embad i ment si :; p i votal l atches 1. i , of wh i ch f our can be readily seen, and theirw associated headed latch pinss 1i', secure the tap and the front wall portions :~'~, ~r~~ respectively to the si de wal 1 s 14, 1b.
The frar7t wall par~tian 'i3 has a viewirrg apertc.cre ~9 through which the Flame setting of the burner ~8 can be viewed.
A pivotally mounted cover plate ~9'precludes blow-out.
The burner suppar-t bar ~~ fiis within rectangular blind r-~ecesses ~E~ ' 1 acated i n mutual. 1. y al i gned rel at i on ad jai n i ng the bottoms of the respective rear wall 1~3 and the front wall 2<a. The burwnerw support bar "~'6 has a ref 1 ectarlshi el d pl ate '~1 secured therebeneath, e:,tending beneath the burner ~~~ to shield from any undue heating the surface upon which the device 1? may stand. The plate '~1 may be of significantly larger area.
A withdrawable closure-sheet ~~ is shown in F=ig!rre i, being inserted, as illustrated to close--off the underlying combustion chamberw gone 3:~ tpartially indicated by a Batted line in Figure ~:') when the device 1'~ is in use as an oven or space heater.
F,ef err i ng to Fi gores i and Vii, the si de wal 1 port i ons I ~, 1 fa each t-,ar~ a lower rack: support 3~ of U-section, and an upper rack:
support 3i of L-section.
1-he 1 awes 1 egs of supports 3~ s!..lpport the c 1 osure-sheet ~, when it is slid~bly inserted far use of the device 1~ ~s an oven ar ~s sp ce he~.ter~; the upper legs of supports 35 support a grill rack:
(not sl-~own > of the usual gadded type, when the devi ce 1 ~ i s used as c~ stove.
A thr--e~ded r-ecept~cl a :~sz' secured to the si de ib recei ves the control valve :~f~ in hind-tightened secured rel~~tion. The supply pi pe of burner ?8 i s s1 i d i nto the r-ecept~cl a :~~'~' i n connected relation with the control valve The upper- r-~ck: supports ~i may be used with the grill rack: ~s an !_!pper shelf far- purposes of b~k:ing in the oven. Fief erring also to Figures 4, ~ end b, the side walls 14, ib end the r-e~r- wall 18 h~~ve inlet apertures ~4, 36, ~8, which lie within i=he cambusti an ch~mber~ one :~~. These i nl et ~per-tures connect wi th the hallow interiors of the respective walls 14, ib and 18.
The walls 14, ib, end 18 have upper outlet apertures The tap -~4 tFigure 4) his a per-ipher-c~l skirt portion 40, farming with the hollow central portion 4~' a channel ~3 into which the upper portions of -the side z-~nd rear- walls 14, ib and 18 e;;tend.
The i nner surfaces of the b~c:k: and si des of channel ~~ have i nl et openings 44, 4b that are in registry with the outlet apertures :~9 of the wills 14, ib end 18.
-The tap :'4 (Fi gure 1 7 has ~n out 1 et vent ~ catnpri si ng a number of small ~pertur-es in its upper- surface.
Tn Figure '~ there is illustrated a protective saver 5!0, to prevent accidental (or deliberate? covering of the cutlet vent ~.'~, which s~~.~. ;' 3E.
might result in incomplete combustion, and possibly, in the generati on of carbon mono:; i de.
l'he device 1~ is assembled, with the rear wall i8 enterwed into the slots 4i of the two side walls 14, ib. The front end of the bur~r~ter~ support bares ~f~ i s 1 orated i n the bl i nd aperture ~6' 1 orated on the inside fbottorn) of the front wall The rear end of the burner support bares r.~6 i s l orated i n the aperture ~6' located on the inside (bottom) of the rear wall 18, and the front wa1 1 ~Ca has i is end porwti ons ':"5 1. orated wi ti-~i n the recesses ~1. The top ~~ sits in encompassing relation with the walls 14, ib and the back: 1~, so that the interwnal convection passages thereof are in registry.
The components are held by latches ii, to secure the assembly.
Tt is evident that the assembly may be riveted. In use, with the closure sheet :~~ positioned on rack: support :~5, thereby cl.osi.ng of f the combusti on chamber one ~:~, wherei n are 1 orated the ci reul ati on i nl et apertures 34, ~~r, .'38, the operwat i on of burwner ~W
causes floe upward passage of combustion gases through the !tpper~
row of the inlet apertures 34,3b, ~8 upwardly along the inner wall interior surface, to heat the adjoining oven space, by radiation and convection. The lower rows of aper~tur°~es 34, 3~, '~B admit an induced flow of cool secondary and e:;cess air into the interior of the walls, to blanket the hot gases, thereby estab).ishing a steep thermal gradient across the thick:nes of the walls, between the inside and the outside of the hollow walls, to maintain relatively coal the outer oven surfaces. The rising gases pass laterally through the interconnecting apertures ~9, 44 end 46, into the hol 1 ow central porti an 4~ of the tap ~4, to er, i t to ~-~tmaspher-e by way of the outlet vent 25.
in addition to the use of gas in battled ar other- farm as fuel, the use of a n~.~phtha gas generator- of the well-known Coleman (Tr-wdemar-v: ) type i s a1 sa passi b1 e.
A thermometer may be readily set in the front face of the char '~.
The use of a si rnp 1 a chi mney secured aver- the vent ~~.r by way of simple siat-and-tag provisions is contemplated. The protective b~r~r-ier ~to which m~.y be provided, ~s spawn in Figure : only, to prey 1 ude acc i dental b 1 ac k: i ng of f of the vent ~~, may be p~r-f orated and str-~dd1 ed by such ehi mney, or atl-ier-wi se removed to f ~-~c i 1 i tote chimney attachment. However, retention of barrier ~t~~ is preferred an grounds of safety. It ie contemplC~ted that the subject walls and back:: portions of the device may be e:: tended downw~r~dly to form storm skirt, for- use outdoor--s under windy car~ditians. E~y ampl y perforating such sk:ir-t to ensure fully adequate, e:;cess air ventilation, the skirt may taN::e the place of the feet i.9.
For pur-pases of lightness, law cast, ther-m~~l characteristics, nan-a;;id~tian ar c~r--bani:~atian, the use of aluminum sheeting far the m~_iar- sur~f~~ces is preferred. Sheet tin may al sa prove satisfactory.
GC7MMEhG 1 AL UT 1 L 1 TY
t~ widespread m~rk:et far this new product is envisaged, including r-ecr~eatican.~l use such as c~.~mping and coo6::-ants; domestic camplement~ry caok:ing, and emerwgency coaN::ing and supplemental , incidental heating in case of disaster s~.~r_h as earwthquak:es, war etc; Al sa, farwse i n f i r~e-f i ghter~ camps q and far mi 1 i tar~y ~.~se~
i~
,.~';
Claims (11)
1. A light-weight hand-portable, multi-purpose heating device comprising: a boxlike enclosed structure with a carrying handle, the structure having hollow walls, the interior of the side walls thereof connecting with the interior of the top wall; the top wall having a vent to atmosphere; an access door giving access to an upper oven chamber portion of the device a heating chamber beneath the upper chamber the peripheral walls of the heating chamber having hallow upper wall portions connected with said side walls, and having apertures providing air flow access from within the heating chamber to the interior of the hollow walls; and lower wall portions of said heating chamber providing substantially unrestricted access to outside atmosphere, to admit excess air within the heating chamber; a heating means located within the heating chamber;
and a closure plate substantially separating said upper chamber from said heating chamber and serving in use to deflect hat gas in heating relation and induced air flow in cooling relation into said hallow walls, to establish a high thermal gradient therein, wherein the inner wall surfaces of said hollow walls are at a high temperature, and the outer-wall surfaces of said hollow walls are at a substantially lower temperature.
1~
and a closure plate substantially separating said upper chamber from said heating chamber and serving in use to deflect hat gas in heating relation and induced air flow in cooling relation into said hallow walls, to establish a high thermal gradient therein, wherein the inner wall surfaces of said hollow walls are at a high temperature, and the outer-wall surfaces of said hollow walls are at a substantially lower temperature.
1~
2. The heating device as set forth in claim 1, wherein said closure plate is withdrawable, to expose the interior of said upper chamber portion to said heating chamber.
3. The heating device as set forth in claim 1, wherein said heating device is a burner.
4. The heating device as set forth in claim 1, wherein said heating chamber has a reflective floor portion as a heat shield for the device.
5. The heating device as set forth in claim 4, including supporting foot means extending below said reflective floor portion, to raise heated portions of the device clear of a supporting surface.
6. The heating device as set forth in claim 4, said hollow walls having convectional heat flow passages of substantially equal length extending from said heating chamber to said top vent.
7. The device as set forth in claim 1, having a threaded receptacle located below said enclosure, in use to receive fuel supply means in secured relation therewith.
8. The device as set forth in claim 3, wherein said burner is a gas burner.
9.~The device as set forth in claim 1, said door including a thermometer set in the face of the door, in use to indicate the internal temperature of said device, when the door is closed.
10.~The device as set forth in claim 1, in combination with a gas burner.
11.~The device as set forth in claim 1, wherein said respective side walls and said top wall are each of substantially equal size, to provide a structure of substantially cubic form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002162297A CA2162297A1 (en) | 1995-11-07 | 1995-11-07 | Multi-purpose, light-weight heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002162297A CA2162297A1 (en) | 1995-11-07 | 1995-11-07 | Multi-purpose, light-weight heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2162297A1 true CA2162297A1 (en) | 1997-05-08 |
Family
ID=4156917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002162297A Abandoned CA2162297A1 (en) | 1995-11-07 | 1995-11-07 | Multi-purpose, light-weight heating device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2162297A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4124798A1 (en) * | 2021-07-26 | 2023-02-01 | New Direction Tackle Ltd. | Portable oven |
-
1995
- 1995-11-07 CA CA002162297A patent/CA2162297A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4124798A1 (en) * | 2021-07-26 | 2023-02-01 | New Direction Tackle Ltd. | Portable oven |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 19991229 |