US1755216A - Dental blowtorch - Google Patents

Description

April 22, 1930. R. l.. HANAU DENTAL BLowToRH Filed Dec. 13. 1927 afm.

l' Paterdzred Apr. 22, 1930 Y Mm wGaelic,E

'ntmo'nrnfr.,` HANAU, or BUFFALO, NEW'YORK, vnssiernonro HANAU ENG"iivnismme COMPANY, 1Nc. or BUFFALO, NEW Yoeri, n, oonronnfrioiv or New Yeni;4

DENTAL Brow'roncn,

l l applicati@ inea December 13, 1927. Yserial 110.239,679., f

- My invention relates to improvements in dental blow torches. u

The primary object of my 4invention is the V'production Yof a simple, inexpensive, and Icompact ,device of thlslnnd, whereinv pro- ,.vision 1s Inadeto secure a sustained or an ir'itermittently projected flame to; be used for various dentaloperations, and wherein means is embodied to regulate the size ofthe projected Haine so that it may bezused to inani-` Vmum advantage under the various/steps em-A ployed inthe production o'r modelinggof dental impressions, and otherdental objects."

Av further object of my. invention is'lthe production ofv a device of this'kind, whichl is easily manipulated, compact insize land there- Y- forealways ready for use, and one whichis adapted `for various kinds ofdentalvoper-l ations.V Y. ,v A still further object of v'my inventionis-to provide a torch'of the kind described-With a pressure-inducing device, an airrnozzle, and an air-storage chamberv between the pressure-` inducingldevice Aand thev air nozzle in which air underv pressure is'maintained so that a continuous or sustained Yame will be pro-` jectedA from thev devicev Withoutther need of continuously-l operating the pressure -indnc4 ingdevice.:' 'w ,Y

With' the above and" other objects inview, the inventionconsists inthe novel features of construction, and in the combinationand' vFig. 1'.

y -Varran'gement'of partsto be hereinafter described and more particularlypointed outfin Referring to the drawings: y Y Fig. 1 is acentral vert`cal Ysections-ofthe device... j` f .Figa 2is a crosss Fig. l. I "Fig 3 is a cross 'F-ig. 4' is a verticalsection .taken through the'upper part of the torchon therplane invdicated line 1f-@Fig 2. Y-

Fig.- 5 4is a vcross sectiontaken on zFig.- 6 isa perspective view of .part ofthe ,device serving to restrict'the a sage npwardly to the znozzle.

pear hereinafter. v Y. Y

.theienlarged'upper end of f sa.k

ction `taken onV line 2&2. 'Y

sectiontakenon line 3443,-

lower ends to forni a head 11v and base 12, rei spectively, the lower end being preferably of i greater diameterthan the upper( The `head 11 and the part 1 3'between said head and the r base may, for convenience be termed'the up, per portion ofjsaid body,1wh'ilethe base may be considered the lower portion. The base 12-is made hollow and the upper portion of the body has avertical-.bore .14 formedfthere# through, which .extends vdownwardly from theL upper endv of thebodyto the interior of the base 12 lthe upper end ,of this lbore being somewhat enlarged and internally screw- `threadedto receive the lower reduced screwis a cross section takenfon line 7 7,

perspective view ofthe f threaded'end 15 v"of aglandlt. This gland has ,itsupprer end Yenlarged and internallv` screw-threaded to' receive an adjustablev sleevejl. l I A wicktubelS is passed through the gland andY tightly fitted int'othe lower reduced por. tion thereof, kwhile the adjustable sleeve 17 is.l

loosely; arranged around the'wicktube-l soV that it 'may be adjusted to' bringthe lupper end thereof any desired distance above'the nppei" end of the wiclgtube 18, for -apurposetol-ape The exterior of the glandl is knurled or otherwise rough-k ened so that it can be easilyv grasped and threaded intothe upperv end of the body l10,

- and the exterior of the'adjustable sleeve :17 is' alsofknurled or otherwiseroughened aboveyits screw-threaded'po'rtion so that it maybe` on 's 'Y `easily adjustedwithin the gland, saidupper.

knurled' or f Otherwise' Toughened portion of the adjnsting sleeveextendingenpwardly a distance above theupper end of-tlie gland 16; The upper portion of the-bodyis also hollow to forni a crescentj-shaped,l compressed-air i storage-chamber 19 therein which,l in the -s form thebody is cast, opens at itslowerfend into thefhollow. basey and whichlhas its' upper reo The lower end of the base is closed by means of a closure plate 2l, which is forced against a gasket 22 firmly seated against a shoulder 23 formed in the base 12, this closure plate being therefore liquid-tight. The lower end of the crescent-shaped air chamber 19 is also closed by a` 'plate 1 24 'in :airtight manner. The hollow base is therefore converted into a liquid fuel chamber, which I designate by the nume-@125, 'and into which a wick 2'6'e'xtends; this wick being passed downwardly ithrough the wick tube 18 and through the bore 14 formed in the body lO. The upper end of this wick extends thedesired distance above the wick tube to provide a flame which is to be projected 'under intermittent for v'sustained air currents, in a manner to be described herleinafter. L

Fitted onto the body 10, between the 'base 12 'and the head 11, is `=a -con'ipre-ssible'rubber bulb 27 ,the :bulb being substantia'lly.spherical` and having openings 28, 29 at its upper and lower endsqfT-he body .portion is provided Y with -a-n Koutstaiiding flange I3() a distance -beneath the head l1 'to provide an annular" groove or seat -310'11 the body 10 ldirectly v'beneath the head,v andit also has a second outstanding iiange 32 a :distance 'afbove the hollow'base l2 to forni a'n annular-.groove or seat 33 vdirectly above said base. -The rubber bulb, fbeing elastic, is passed downwardly over the head l1 onto the Lp'f'rrtion of the body between said .head 4and the ibase sotha't the upper and lowerpo'rtionsoff the'bulb, or 'indre particularly 'thewalls of theopenings 28 fand 29 in -sa-id bulb, are vseated against vthe annu lar seats 31 and 33 provided =on 5the bcdy i0.

mary iaircharnber, whichis incomniunication Y with the compressed-arr storage-chamber 2119 the bul'b 'thus having body.

Formed in the body and extending downwardlyfr'oin the upper 1end"tlfiereoffis'a pocket 34, the-lower portion iofwhi'ch is reduced in diameter to form 'a valve chamber 35, and the `upper portion of which Y'is screwe'tlueaded to receiveanexternallythreaded armrest-ricrin'g 'sleeve 36 which extends upwardly be yo'nd the *bodyflfl The enlarged fu-pzper pertion of this pocket is in communicationwith the reduced 'upper lend 2Q tof the lair chamber 1'9 through ythe medium :of a portf. An angular air ipassa'ge SiS-connects theiriteriorr ofthe bulb- '27 with the fvalve chamber 85. The'air passage B8 [opens lateral-1y into said bulb and upwardly laxially into'said vaflve chamber toffo'rm valve seatf) and 'it Ais closed by algravity or ball vailve'40 V'whichhas v limited movement yerticallywithin' said valve "chamber, v'as-will appear; hereinafter.

By reducing the diameter `of the lowerfend of 'the pocket 34, 1an 'upwardlyefacing shoulder 41-isprovided in f'saidpocket. The lower endl ofthe ai'rrestricting sleev'el "is spacedA trom said' shoulder, as at '42, to form a .pr'-` sure an air-tight .joint at this point.

through the medium of the port '37. Fitted into'the lower end of saidV sleeve 36 is a plug 43,'which has a longitudinal groove 44 in its peripheral face and an axial depending stop-` pin 45 which extends into the valve chamberV 35. The interior of the sleeve 36 is in connection with the pril-nary air chamber 42 through the medium of the groove 44, which may be referred to as an air-restricting passage, and therefore this primaryMa'ir chainber is in 'connection with the interior of said sleeve,' asnwell as with the interior of the compressed-air storage-chamber i9, and it is to be 'noted'. that the port 37 between this primary air chamber is considerably larger than thefairres-tricting passage 44. 2 Itis,fof course,

to close'the lowerend of the -sleevefthis sleeve may l:be otherwiseclosed at this point, and the restricting lair passage provided `-bea tween the interior thereofand the primary air chamber `42befoririedin any other ap'- proved manner. Y f Y h n thetolp of the body 10 around the 'projecting portion yof the external'lyfthlreaded sleeve 86, a depression 46 is formed, in which a gasket 47 is'disposed,and lontothe projecting portion of said sleeve a nozzle 4holder or carrier 4'8i's threaded, the lower end of which is in irm con-tact with said :gasket 47 to as bore 49v throughV this nozzle fholder 'or carrier is restricted fat 'its upper end, and threaded into the restricted portion of said bore from the side of said nozzle'holder'or carrier, is a nozzle 50 :having a y-compara'tively small exit openingr5l. The restricted portion ofthe borer49 extends to the upper end of said nozzle helder V-`and-fthe upper :portion `thereof'is threaded 1to receive the threaded shank 52 of apressure-'relief scire'w v53 which has V.an enlarged knurled head, between which andthe upper end ofvsaid nozzle holder orgcarrier, a gasket 54 is arranged.V The threaded-shank 52 `of this pressurerelief'screw is cut away atone side along its Yfull'length,as at 55, forming anair-relief pressure -or vThy-pass 56 along 'said shank, which, however, is closed in an airftight man-ner by the gasket 54 when the screw is tightened into the upper reduced end of the bore in said 'nozzle holder ior carrier. This airltight condition is'1festablished,due to the fact that thehead of said pressure-V relief screw bears ytightlyV against said gasket.

W'hen slightly unthreading said pressure-relief screw, the reliefpassageror by-pass 56 The Y will be opened to the outerL air so as to allow 'the escape ofv a quantity of air passing npwardly through the nozzle holder lor carrier, as will be hereinafter described. The nozzle 50 is-disposed to direct -za current offair across the lighted end of the wick 26.

'F or conveniencefin manufacturing, a transy verse lbore 57 is formed through the ,nozzle holder or carrier `seas-to -intersect'the reduced 'V49 lt is to be understood that this ball valve does upper end of the bore 49 extending vlongitudinally therethrough,iand this transverse bore isthreaded at one side of the reducedupper end of said bore to receive the reduced inner 'end 58of the nozzle 50, while that portion of the transverse bore at the opposite side of said gcduced upper end is closed by a screwlplug- One or more air-inlet passages 60 are provided in the bo-dy 10, each of which include a vertical branch 61. extending downwardly from the upper end of the body 10, `a horizon-V tal branch v62 extending from the lower 'end of saidvertical branch to the interior'of the branch a distance from its upper end outfrom' opposite sides lof the body, but are A'not' compressible .bulb 27, branch 63 extending from said vertical wardly to the exterior air, thisl arrangement being provided for. 'convenience in manufacture.. The upper end of the vertical'branch of each air-inlet passage 6() isl slightly en larged and screw-threaded to receive a screw Yplug 64 .thus eachairvinlet passage has an air inletat one end and an airfoutlet at its endend is otherwise closed. v

The horizontal branchk 63y o f each other vair-inlet ypassage isreduced in diameter at its inner branch 62 between its? sleeve 68 and the re-v ducedinner end 65 thereof serves as the valve chamber 66, referred to, and arranged ,therein is a ball valve 69 adapted toY close against the valve seatat the inner end of the sleeve 68;

not at any time close the reducedinnerend 65 of the branch63 in an air-tight 'mannen These air-tight passages lie at opposite sides'yof a vplane .passing 'vertically through the wlclrtube andthe airjr'estricting ,tu be"36.` The device is ordinarily. used by slightly tiltingit so that the nozzle isinclined down-v wardly, which results `in the-'ballvalves 69,

arranged intlielair-inlet passages-60, rolling against` their valve seats'at theinner` endsl ofthe sleeves 68,.. ,y Y

It may,for certain purposes, be found -rdesirable to have the horizontal branches 63 open into the vertical branches 61 of the aire inlet passages from the .opposite silde'of the bodydlO, and forY this purpose,when-die-castngthis body, all ofthese horizontal branches are only partly formed inthe body, asindcated atvthe right in1 ,Figs.,2 and 3. Thus formed, `and ydesignatedby the numeral 163,

theyfa're directed toward the vertical'branc'hes in communicationtherewith. The reduced portions of the horizontal-branches62 of and a horizontal.vv`

the air-inlet passages are'therefore provided by Vmachining a connection between'the selected partly-formed branches '63 and the vertical branches 6l; thus forming the coinpleted horizontalbranches 63 shown at the left iniFigs. 2 and 3. Therefore, one or both "of theppartly-formed branches 63a at either side of the vertical passages 6l may be completed and the ball valves and their seats inserted into them. When the device is mainly used in a; position in which thenozzleis in# clinedvdownwardly duringuse, the branches 63 will-beat the left, as shown in Figs. 2

and 3; whereas, when the device is used'in Y directing the llame upwardly, due to the ail" nozzlewbeing` so' disposed, the branches. atthe Y Iightin Figs. 2 and-3 will lbe utilized. "In either case, the tendency' is for the ball valves togroll against their seats, and thus-closesaid l n air-inlet passages. 1 1 Y f Broadly considered, theair passage 38, .the valve chamber 35,'the primary air chamber. 34, the-sleeve 36 withits restricted passage 44, andthe nozzle holder or carrie-r. 48 with its ,.iiozzler, serve as an airsoutlet passage which.

extends from the Vbulb tothe vexit opening' 5l of the nozzle; and in theV claims, Aunless parts of this air-outlet passage are lspecifically set out, all of said parts?,` orrparts serving the same purpose, are unit.

lto bej construed as such The liquid fuel within'the chamber 25 is drawnupwardly to the upper end ofthe wick 26 by capillary attraction, and after lighting theupper'end of this wick, the flame there. from may be regulated by the adjusting' sleeve 17, the upper end of. which ismoved'outwardi ly over the free end of the wick tube 18 to the desired extent. Upon compressing the bulb` 27, the air therein and in thelower portion A of the air outletpassage is compressed, the

f ball valve40 in said Apassage becomes unseated andpart of the compressed-air passes into v the air storage-.chamber yand a smaller part ythrough the air restricting passage 44 in the sleeve 36; Y The expansion orw recovering movement of the bulbv draws the ball valve 40 back into Vthe bulb ,at the same time, the ballvalves in the air inletjpassages 60 become uniic rvtoits seat" and preyents the return of compressedfair from the air I storage-chamber v seated yfrom the ends of the sleeves 68, thus providing aicontinuous passage foradmission of atmospheric air to the interior of the' bulb. Further compression ofv thebulb results in the the lower portion of fthe air outlet passa-ge,v

ing out throughthe restricted airrpassage44. Thisaction is continued until suflicient pres- 12eairdrawnthereintobeing forced out through A, j

'Part there@ Ventering, the compressed-air,V stora gechamber 19 and .a smaller' part pass-VV n j sure is created within f the /compresse'd-jairjz.

storagefchamber,after'which slight intermity tentpressure on the bulb with intervening VeX- panding or recovering movements will pro-- vide :al-l the :air .that 4can possibly escape through the :aiirestricting passage 44., the air through said passage being provided .bot-lr from the bulb and the .compressed-air storagechaiii'ber and lescapingouft through the nozzle, where itis directed against the .flame and causes the ifizanie 'to be directed` laterally .from the end ofthe wick. The successive compressions and .expansion movements of the bulb'results in .a yconsiderable amount of air being stored in the compressed-air storagech'aniber 1:9., and therefore a continuous flow of -air is provided from the nozzle so that a constant or sustained flame may be directed laterally from .the wick. lVhen, however, Ian in teiiiiittentlyprojected flame is desired, 'the relief screw 53 at the top of the device is slightly unthreaded so as to unseat the head thereof from the upper end of the nozzle holder or carrier, thus uncovering the relief air passage '56 at the flatside of said relief screwand. .allowing a portion `ofthe lair directed to the nozzle to esca-pe through said relief passage.

When the relief passage 56 is opened, it willf being worked 1upon,rcontrolled according tol need.

Having thus described my invention, what I claim is l. A dental blow torch, comprising a body having a. fuel supply .and a wick Aextendiiig from .said fuel supply and projecting out war'dly therefrom, :said body having lan air storage chamber tlierein, `a nozzle carried by said body v*and disposed at an angle to ithe projecting end fof said wick, v'and .an air preissur'e-iiiduci-ng device carried by said body and having -aii air inlet and an fair outlet, said lair voutlet having'communication with said air storage chamber and said nozzle.

2. `AJ-de'iital 4blow torch, comprising a body having aliquid fuel chamber at its lowerend,

a wick boreexteiidiiig from the upper yend :of said body to said liquid Vfuel chamber and a compressed-air storagecham'ber adjacent said wick bore, a wiclrextendingthrough 'said wick bore and entered into said liquid fuel chambensaid wick projectingfrom said bore at the upper end of said body, a coiiipressible bulb surrounding said body, 'said body, having Aa valve-controlled air inlet passage leading to 'the' interi'or of said bulb. 'and 'a `valve- Vcontrolled Y air outlet passage extending through said bodyand opening irrto saidbulb, said valve-'controlled outlet passage having communication with .said compressed-air storage chambenandan airno'zzle the upf pereii'd of said body y'and cl-isposed an .angle sesame said 'liquid :fuel chamber upwardly through sai-d body and projecting from the upperend thereof, :a valve-controlled air .inlet passage lleading to the interior of said bulb, :an V@ai-i' nozzle .mountedo-ii said body at right-angles .to sai-d wickso as Lto :discharge a currentozl air across .the projecting end .ofsaidwiclr, and a. valve-.controlled air Voutlet passage leading from the. iiiter-ior of .said bulby to ,said nozzle, said valve-controlled air outletpas- Ysagehaving communicatioi-i'witli said compi'essedsair Storage-c'haiiuberl between said nozzleand the controlling valve in :said air outlet passage.

' e.. A dental blow torch, 'comprising a body reduced in diameter between .its ends to forni ahead .at its upper end an'd a baseat its lower erich-.said -body having .annular danges 'on .its reduced, portion spaced, respectively., from 'saidhead .and said base to formzgroo-ves, La

lconilpressifble bulb -.surrounding lsaid reduced portion yand beiiigffitted into said grooves, said base bei'ififg hollow andservinglas a liquid fuel fcharriberand the rei'nainde'r of said body b'einfg hol-low and 'divided longitudinally to servev as a compressed-air 4storageschamber and ya wiclrbore, a wick in said bore 'extending -i-nto said .liquid fuel chamber and projecting from the upperend fof' said bore, an air nozzle Emounted on .said body and disposed 'to direct la current of :air across the upper projecting ieiid thereof, means to 1coii trol ythe admission of air to .said bulb, and means to Vcontrol the discharge of `air from said bulb under pressure, saidslasteinentioned `means leading 'to said airfn'o'zzle and lto said compressed-'air storagef'tanh.

5. a .rientri .biow .tOi-ch, comprising .a iwi- 'low body having afliqufid fuel chamber and a compressedair storage-chamber, a compressible bulb surrounding said body,V a wick leading 'from said li pi.idfiielv cham-ber and Vextending upwardly through said" body V'to in said fai-r outlet passage disposed betweenfr,

the connection thereof with said air storage c cli-'amber andsaid nozzle.l v Y i 6.1A dent-al blow'torch, comprising a hollow body having a liquid fuel chamber at its L*lowerendl and a compressed-fair storage.-`

chamber aboveqsaid liquid'fuel 4chamber,ja

i. wick leading from said liquid fuel chamber Vand eXtendingA-upwardly Aalong said compressed-airl storage-chamber andl 'being sepa- Vratedv therefrom by a wall," said wic j jecting from-the upper end'of said hollow k pro! body, lanair nozzle mounted on said vbody anddisposed to cause acurrent of air to intersectf-the'iiame at the :projecting end ofl said vwick,I a compressible lbulb Surrounding said bodyQyan air inletmpassage' for said bulb,-and

an. air nozzle `mounted on said body and disposed to cause'a current of air to intersect the an vair outlet passage leading from said bulb to saidfnozzle' and having iiieansvto restrict the current of air passing to said nozzle, said air-outlet passage having also Vunrestricted 'connect-ion with a compre'ssible bulb. surrounding saidbody, c

an air inlet passage for saidibulb, and an" airjoutlet passage leading-from said bulb to saidinozzle and having means Ito regulate the current of air passing to theeXit-opening of said nozzle so as to issue an intermittent or a constant f current of lair A therefrom against said flame, said air outlet passageliaving'also unrestricted connection with said' com-'- pressed-air storage-chamber. 8/A dental blow torch, comprising aihollow body having a liquid fuel chamber at its *lower end and a compressed-airfstoragechamber above said liquid' fuel chamber, a ywick leading from said liquid fuel. chamber' :g and extending upwardly along lsaid compressed air storage'cha'mber. and being sepa'- rated therefrom by a wall, said wick projecting from the upper end of said hollowbody,

{iame at theprojecting end of saidwick, a' compressible bulbsurroundingsaid body, an

, air inlet passage for said bulb, an air'outlet passage leading from said bulb to said nozzle Land having means to restrict the current of air passing to said nozzle, said air outlet pasywith said: compressed-airv storage-chamber,

A,outlet passage whereby an intermittent or sa'O'e havin also unrestricted connection and a controlledaair relief passage in said air a consta'ntcurrent of air is caused to escape from said air vnozzle and pass over the v'projecting end of said'wick. i

^ 9. A, dental blow torch, comprising a low body, air pressure-inducing means' supported by saidbody and lhaving a valve-controlled air outlet passage, a wick wit-hin vsaid body. 'and projecting therefrom, a nozzle directed towardtheprojecting end of said j wick to directairvcurrents across the same and to: which said air outlet passage leads and lmeans in said air outlet passage for con'-` r4trolling the passage of air through said noz-V zle so as to cause `intermittent currentsorY al y 1 0 A dental blow torch, comprisinga body constant current of air to issue therefrom.

having a wick projecting therefrom-'and means to feed .said wick by capillary attraction 'with a liquid fuel, a inozzle carrier mounted on said body having an-air nozzle disposed in a plane above the projectingend ofsaid wick so as to direct currents of air over said wick, an air pressure-inducing de- ,vice'cairied by said body, a valve-controlled'` air'inlet vpassage in saidbody leading to said Y air `rpressure-induciin'gf device, a valve-controlled air-outlet passage in said body leading v from said air pressure-inducing device to said` nozzle carrier, andmeansbetween said air outlet passageand said air nozzle y.wherebyall air entering said lnozzle carrier. may n be directed outwardly through said nozzle or a portion of said air be allowed to escape fronifsaid nozzleV carrier, the air escaping fromsaid nozzle being directed across the projecting end of said wick.

rll. In a dental blow torch, `a body having air,"pressure-inducing means and a wick pro- Y jecting therefrom, an air escape nozzleA adapted to direct a current of air across the projecting end of'sa-id wick,A an air passage leading from saidv airr pressure-inducing' meansto said nozzle, an opening in said air passage, and a pressure relief device fitted within V.said Vopening andv adapted to closethe same or open` the same to anyl desired extent within said-'certain limits.

. l2. ln a dental blow torch, a body having air pressure-inducing means and awickprojecting therefrom,v anV Vair escape nozzle.

ico

adapted to direct acurrent of air across the*y projecting end of said wick, anairpassage leading from said` air pressure-inducing l means to said nozzle,a` screw-threaded openyinginsaid air passage adjacent said nozzle,

and anA air relief screw having ahead and y y being cut-away at one side to forman airpassage when the screw'ispartly Unthreaded.

18. A dental blow torch, comprising a hollow bodywhavinga wick projecting there- V from, an airpressure-inducingdevice carried tliereby,an airescape nozzle;disposed- Vto-dire'ct a current ofV air across the projecting end of said wick, a valve-controlled air' l voutlet passage in said body leading lfrom said air pi:'essiiie-'incl\1cing device to said nozzle and an air' inlet passage in said body leadingl l inletv passage beingreducedin diameter at a point along its length to form a shoulder, a sleeve fitted into.y said air passage in spaced relation to said shoulder, and a ball valve within the Vspace lbetween said sleeve and shoulder andadapted to. close against said sleeve to,l prevent the admission of air into s-aidlpassage, said shoulder being formed to pre-vent the complete closure ofVV said ball valve thereagainst.

lli.V A' dent-al blow torch, comprising a body hav-ingr a wicl projecting therefrom, a compressible bulb surround'ino' said body and .secured thereto in an air-tight manner,VV a" valvecontrolled air inlet for said bulb, a slfieveV threaded into said body and having a restricted air passage at its lower end, an air ontletpassage. leading from said sleeve to the interior of said bulb, valve within said`4 Vair outlet passage adapted to prevent i the admission. ofairinto said bulb but periit' the passage"otairftherefrom, a nozzle carriertlireaded-ontesaid sleeve, and a nozzle i projecting laterally from said nozzle carrier and disposed to direct a current of air across the projectingV end of said wick.

15;.; A dental blow torch, comprising; a hollow body having aliquid fuel chamber and awick extending 'from said liquid fuel chamber outwardly to proi ect from the upper end of said bodv. -a compressible bulb surround innl said hollow boidy and secured thereto in an: air-tight 4manner. a sleeve threaded. into said `hollow body from'the upper end and projeeting` outwardly therefrom, a plugY fitted into; the lower end of said sleeve and having' a longitudinal. groove` therein to form an air'- cting passage. sai-d plug having a dependinggstopf nin axially thereon, an air pas sage-leading from said sleeve to the'interior ofsaid bulb and having a reduced portion serving; to vform a valve seat, a valve in said passage between its seat and the end of said Y dependingstoppin, a nozzle carrier threaded fia' onto'the proiectingr'end of said sleeve, and

ia nozzle extending laterally from said nozzle car-rior an'ddisposed to direct a current of air across the projectingr end 'of said wick.

16'. A dental blow torch, comprising a body havingr air pressure-inducing means and a vnozzleconnected with said air pressureeindueine means; said body having a liquid fuel chamber at itsv lower end i andl a wick bore exteiiidinp; from said' liquid fuel chamber to the upper end ofrsaid body', a gland litted into the yupper, end of said bore, 'a wic'k 'tube Y fitted into said `.Orlandand extending upwardlysa distance above the same, an" adjustable adapted toi=have Athe flame thereof, when f lighted, receive a current. ofV air from said nozzle. i g 17. A dental blow torch. comprisinga hollow body hav-ing;F a liquid fuel chamber at its lower end anda wick bore extending upwardly from said liquidV fuel chamber and opening at the upper end ot said body, said bore having its uppfer'end enlarged and screw threaded, an air lescape nozzle atjthe upper end of said body; air pressure-inducing means connected with said'lnozzle, a `,eiland screwthreaded into the screw-threaded npper end of said wick bore and having its upper end internally screw threaded and itslower endprovided with a'smoothl bore, Ya wick tube fitting into: said smooth bore and extending upwardly beyond the upper end VO f said glandfan .adjustable sleeve VsurroundingV said wielr tube' andscrew-threadedinto the upper end of said gland, said adjustableV sleeve being capable of' adjustment to bring the upper end v*,Lheremf above the @Per @Didn of' Said 'wick tube, and a wick fitted into said wick; tube and eXtendingdovanwardl-y therefrom into said liquid fuel chamber, said wick projectingfrom the upperend o'f-sa-id/Wiek tube and said nozzle bei'l disposed to direct a current @fair across the proiectingendv of said wick, l Y c i8. A dentalV blowtorch, compri-'singa body supporting all parts of the torch and having a; fuel supply therein, a' wick therein extendingifromthe upperendthereof and receiving fuel from said supply, an air nozzle supported byV said. body in operative relationV to said wick,- a pressure-inducing device surroundingsaid body, and means interposed between said pressure-inducing device and said air nozzle ineen-duit connection with l both to assure aconstant currentV of air from period of time.

19. A dentalfblow torch, comprising;l a fuel supply, a wiclr receiving fuel from said supv ply. anV air nozzle in operative relation to said wiclr. a :pressuresinducine; device, and means between said pressuresinducinp) device and said air nozzle in connection with both whereby intermittent currents of air. or a constant current of air, is caused to be directed from said air'nozzle over the end of said wick. Y

In testimony whereof I affix my signature RDQLPH L- HANAU. f

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