US1919945A - Burner for blow torches and the like - Google Patents

Description

July 25, 1933. H. M. HUFFMAN BURNER FOR BLOW TORCHES AND THE LIKE Filed Jan. 5, 1931 //V VE/VTOR HORACE IV. HUFFMAM v Patented Ja1yl 'g5,i1 3

ff, Home "Brianna FOR eowe a aasnaame LIKE l invention relates toburners foifiblow "cups-is open. to various"objections. Foij eX-:

torches and thelike: and more particularly to "means ior preheating such a aburnerto initiate the" operation thereof; The burner of" a; blow torch as usually constructed, comprises a' flamew tube which is connected by a conduit with atank 'containing liquid fuel under "air ,pressure-,a,the delivery of the fuelfromthe tank to the flame tube being controlled by a valve at'the rear endof the flame tube. a The fuel conduit "is so arranged with relation. to the flame tube that when the burner-is in op'eration the. heat therefrom will heat the: fliel -in the conduit? and vaporize the same -butin'j'order to initiate the'operation ofthe' burner it has been customary to support a l drip cup- .beneath the burner'and to deliverliquid fuel: to that drip cup and there jignitethe same: Thear'npl e, f it not infrequently happens that'jthe again fill; the drip cup andigriite'the fuel of fuel y no h v shee th bPm ZS' lfi cientlyto initiate its" operationit Ewillfn' vertheless have iheatedfthe; flame a to such .an extent thatlthe'operator' -cannotlagain he must findxsome" other-means for; closing the end oftheflame tube: Under rmany con-j ditions of operationno: such": means is availv ience is occasionedwhenj'theburning of the first cupoffuel failsto set the burner :in

operation;- Further -i fgtheoperator wears a glove on the handwhich closes'theflamej" tubethat glovebecomessaturatedwithzfuel 1 In the accompanying drawing Fig.-

. 1 In th l'drawing'I burning of the fuel inthe drip cup will not sufliciently heat "the burner to initiate operation "thereof; a and it isf 'neoessary to therein; While the burning of the firstcup',

place his" hand" against the end thereof,[ a;iid in order ;to fill the drip-cupthe seeondltime able and; much loss offtime 'and inconven'g "Application a e try-@1931; seiiai No. 506,675.1f

and there is serious danger of itsbeing ig-= nitedf by the flame from the drip cup. One object of the-present invention isto, "provide a burner of thiskind 7 having im proved means for filling the drip jcup which will beffree from the fobjections to the pres ent burner.;-:j

Al-further object the invention Y provide a burner -with means for fillinglthe dripcupwhich will be verysimp'le in its construction and operation and which can be embodied in the burnerat a very low'cost.

{Qther objects ofthe' invention will appear as the device is described in detail.

side elevation of a burner embodying my invention, showing the flametub'e-and conduit insection; Fig;- 2is a side elevation, partly M, 3mm, astr ngen -urg tassrenon zro 'ntir'rirn'n; MANUFhc'rnn- V meoonrany, orinmrron, onro, eponronarro t oronro 4 in eeapmo a slightly modified form-of burner; Fig. 3 isa side elevationypartly in section, of afurther modification of the inventi'o'n'; Fig. 4 is' aside elevation, partly in section, of'a portion of a burner illustra't ing another embodiment io'r the invention and Fig. 5;is"a section'taken' on the'line,

5 5 of, Fig. 1

mentsihave been chosen for the purposes 'of p have illustrated certain, embodiments of the-invention but it will be c understood thatthese'particular embodi u I illustrationonly, andthat' the inventionmay 'lustrated in Fig. l the'preheating device -is 'takevarious" forms and may be appliedfto applied to aqWell known type ofburner head.

' inwhiehthe burner proper is in the-form of flame tube 5 a'nd-is connected-with a-source .of fuel supply by a;vein tube or fuel 00ndu'itfformed in the burner head and having-a horizontal portion 6jand'an upright portion 7-, the latter portion communicating with the flame; tube" through an inlet port 8, which is 7 shaped to form a valve seatiwith which c0;- operates a -needle valve 9 havingj-an operat-.. iiig handle or hand wheel 10; The horizon talportionifiofftheconduitis connectedwith i a tubular-I fitting 11 which; forms {a partzof thefuelconduit andis attached to and com- V municates with afueltank l2 and which, in

the present instance, forms a support forthe burner head or structure. The fuel tank 12 is usually provided with" anair pump 13 to subject the-fuel therein to :airipressure. Ar-

ranged beneath the burner and, preferably mounted on the tubular fitting 11, isfadrip cup 14.1 The conduit which deliversthe fuel fromjthe tanlr 12 to the flame tube is pro-- vided in advance ofthe valve 9 with avalve controlled passageway or supplemental con; duit through which fuel may ibe delivered from the conduit to the drip cup. Thisipae i sageway-may take various "forms and inay be arranged in various positions but, as shown:

in Fig. 1, the main fuel conduitis formed in the burner structure, or, head and the burner head is provided with airearwardly extendingpart orbosslfl-having a longitudinal bore or, conduitf16 arrangedinline with thehorizontal portion 6 of themain conduit,-= having an outlet-17 directed, toward the fuel cup 14 and'constituting a supplemental f'uelxconduit. The bore 16 of the supplemental conduit is provided between V the OutletUl-T; and the; main conduit witha valve seat lSwliich is engaged bya valve 19.- As hereishown, the valve 19' is' carried by a stem 20 having screw threaded engagement with the rear portion of the boss Qand is provided with an operating handle or knob 21. To fillthe drip cup it'is only necessary to seefthat the valve 9 is closed and to'then open the valve 19 to per nitthe fuel to flow from the main conduit through the a supple mental conduit. and its outlet into the drip cupgjVVhen thedrip cup has been filled the supplemental valve is closed and the fuel ig nited. vWhen the burner has been heated themain valve 9 :is' gradually opened toipermit the fuel to enterthe flame tube from the main conduit, where fit is ignited. Prefer ably; the boreflG' 0f ifl18 supplemental cone 3 duit is connected with the mainzconduitbyl an orifice 22 .of small capacity sothat the? fuel willbe delivered-to theoutlet 1 7.forv

thesupple nental conduit at a lowered pres:

surewhichwillprevent the splashing of the 1 fuel from the drip cup Further, the pres-t. sure on the fuel within thesupplemental con-.

oluityis reducedto such an extent that there is little likelihood f leakage; about Qthe' threaded valve stem 20, thus avoiding ,the nece ity a p n l nd a a fpe It will be understood, however, that there? strioted: orifice between the supplemental conduit and the main conduit is not ,essen tiallto the operation of the device. [When the'burner head is arranged in an inclined position as shown. in Fig.1, it is desirable. that: it should; be PIT-()Vided with a hollow boss surrounding theoutlet openingnfrom the vconduit and; forming a continuation ofl hewjo t, t pr ve he iq i .fr mfiow ing rearwardly- 'alongthe outside of 'theQpart .1 to'fth burner head-11: Ali a In the arrangement, is much the same as that shownin Fig. 1 but the supplemental conduitis formed in a separate part,

thus making it possible to apply the inventionto a burner of the present type without substantial change in the construction thereof. As there shown, the'supplem'ental conduit is formed in atubular member 23 having atits forward end a threadedprojection ,24tiiadapted to rbe "screwed into a threaded opening at the rear "end of th'e horizontal portion .6 of the main conduit. In some burners lthis 'horizontal portion of the coniduit isxbored from the rear end of the burner structure and the rear end thereof closed by a'pluglf Inisuch a caserthe plug may be re- .movedand the" tubular ,member 23 substi tutedf therefor; JIf the main conduit was not bored throughthe'rear. end, of the burner structure it is only nece'ssaryto provide a threaded openingu'at this, point; The supplemental conduit in the tubular member 23 is similar to that shown in Fig. 1 and isoconnected withtlie'mainconduit by a restricted orifice 25 and has an outletl26 arranged above the drip cupld. 'A valve 27 engages a 'valveseati at the rear end of the restricted orifice '25 tolcontrolthe flow of fuel to the outlet and this valve is, carried by stem 28which is-screw threaded into the rear end ofthe tubularzmember and operatinghandlef29.

. In'- Fig. 3 eave shown the-invention a appliedto a burner of a slightly different through'which the jf fuel may; enter the lflame tube." In this construction the burner i "structure 1 extends rearwardly to such a point that itis' notzfeasible to further extend the same for the purpose, of providing a supple mental "conduit; I have therefore provided thelower part of the structure with an enlargementBG, arranged below the horizontal portion 30fof the main conduitfand-have formed the supplemental conduit 37 iuthis enlarged portion ofthe structure." The forward end of the supplemental c'onduitis conv nected by a restricted orifice 38 with-a passageway 39 leading to the main conduit. Thesuppleniental conduit also has-an outlet 40 directed toward'the fuel cu 14: and: has

between the outlet '40. and the orifice 38 a which is carried by a] stem 42 extending rearwardly beyond the; burner structure.

L That embqdimen of the, v es d n provided with an 7 valve seat which is 'enga'gedby a valve 41 secure by'Letters Patent, is: ,o

1. In a blow torch, a burner head hav-' in Figs. .4 and '5 is applied to a burner v similar to that shown in Fig.- 3 and the supplemental conduit comprises an inclined pas-' sageway 43 formed in the burner structure,

communicating with the-main fuel conduit near the upper end of the tubular member 11 and having its outerend arranged-to discharge into the drip cup 14;. ,A valve 44 controls the flow of fuel through the supplemental conduit or passageway.-

While I have shownand described certain embodiments of my invention I wish it to bev understood that I do not "desire to be limited to the details thereof as various modifications may occur to a person skilled in the art.

Having now fully described my in'ven tion, what I claim as new :and desireto ing a flame 2, a main conduit to connect said flame tube with a source of supply for fuel 'under" pressure, a supplemental conduit having a downwardly directed outlet, and an orifice connecting said supplemental conduit with'said main conduit, said orifice being of less capacitythan said outlet, a valve to control the 1 flow of fuel through said orifice, a drip cup arranged beneath said outlet to receive fuel therefrom, and a valve to controlthe delivery offuel fromsaid main conduit to said flame tube.

2. In a blow torch, aburner head having a flame tube, a main conduit to connect said flame tube with asource of supply of fuel under pressure, a supplemental conlengthwise of said burner head and com an'orifice connecting saidsupplemental conduit with said main conduit, said orifice being of less capacity than said outlet, and i a valve seat interposed between said orifice duitghaving a downwardly directed/outlet,

and said outlet, said burner head also havmember connected with'said stem and mov-" able thereby into and out of engagement with said valve seat,= a drip cup supported i beneath} said outlet to receive fuel therefrom, and a valve to control the delivery of fuelfrom said. main conduit to said flame tube." v

3. In 'a blow torch, a burner head having a flame tube,'a main. conduit extending municating'with a source of supply for fuel under pressure, valve controlled means to connect said conduit with said flame tube, a supplemental conduit substantially in line "withsaid main conduit and having a downwardly directed outlet, an orifice connecting said main conduit-with said supplemental.

conduit, and a valve seat at that end ofsaid orifice; adjacent to said, supplemental ,conduit,.said orifice "being of less capacity than ng a screwthreaded opening. leading to 3 said supplemental conduit, a screw. threaded valvestem mounted in said opening, a valve

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