claim i,s:-' 1. In me@ii-is TOI@ fee(iilll" ])Lllveriz,@,(]. fiiel, ioo tl-ie combinttion -",itli I, soiirce o.T- fitel sill)- t casiri,,, litviii,(), i cl.ostii,e i-)ro@,ide,,'[ -",ii-h a i'iiel oi-itlet pisst(-C, a ilozzle iii i(l.v,,i,nee of tl)e elostii,e, tn aii, siil)pl@T I)ipe ii-i comm-utiii-@-,Titl) the ii(,zzle, ,t i.-otor moil).I)er (lis- lo5 I)oS((1 iT) o-r @titcl ,t(liteeiit the elos-Lire, sai.(] rotoi- niei-iil)er Met.IIS for (@reti,titi" a IT@l,ei-[Ulll to exel.-t-. I, sil,eti,0,1). ii.i)oi-i tli(,, -fiiel wi.t-lii.ri the (t@isiiig. 1-ii mei,iis -f'or @itel, :"lo tle eoiill)ill"l,tio.11, S;oilrc(@ o,f, fi[e] )Ii,, ,i haviiif, ,i, 'i)eicl pronide(i V,,itli I li@ I ]el (Iltlet p'ISS@t(-e., @l iiozzie i,-l of tlio bea(l, ,in tir SILI)I)IV Pil)C ill COII'IM@l-IDiC@ltion -",ith the liozzle, i,"rotoi@ - men)t-)ei-, seelired 115 to lica(l, s,,i,icl. i-otor moi-nbe,,, litaii-igr 11a,@iieti.oll (II)oll tile f(lel ivit[iiii i@-"Ie 'I. Tii irici,iis l'oi,ilIC, COD-ibiiiitioii, A V-tli @-,, sll)ltl."-.e or i'liel sll)-)- L,@ o lile",),Ils to -'t.orill il@ltc@i-i.or el),iiiibei-, ,iji(i ,i@ closiir(, -for LI)e )),itli ,i TIL(li Oiltl,-,t ,I Ilozzle ii) of tj'ie ,tn si,1.1)])INT ('OMIDIT'IicltiO-.'l tl).e liozzte @,,l 125 3.@otoi- nieii-iber cl.i.sl)osed ,tclj,,icen@ the closit're, s,,i,i(i rotoi- inember havin(v imi)el,ler means foi- ere,,ttin- ,t vac-Li.uiii to e,@,-ert I stiction iil)on the fuel withiii the, clsinff 4@ --Iii means for I'eecling ptilyerized fuel 130 ,),ir 1)11)e -Li iiisertc,@[ ill thc, M(@@ilis l'or t 17@l(@(LilTn tO eXCri-I

1,342,135 the conibinatioli. iyitli a source of fuel supplyl a casin(, liii,ing meiiis to forin an interior chamr)er froi-a wfiich the fuel is excluded, tnd ,t closure for the casing provided Al'itli It fliel olitlet-passage aild t p.-tsstge in C(ifinitinieatioii Avitli the iiiterior elt, ,iii-iber ,t iiozzle, an ,iir supply I)ipe iii eollijiiuiiiei.tioit in,itli tli(@ iiozzle, a rotor ineii-iber disposed @idj@i,eeilt the closiii-e, stid rotor iiieiiit)(,@r li,,tviiig io iiiipeller ineails for ere,,ttiii(, t vactium to exert L stictioii upoii the f uel Niitliiii the casina. 5. In iiietils for feediii(, fine eoal, t fuel stipt)ly pil)(@, ',I'll @tir stipply pipe, t casiii(- L@ liavlilg a liead provideci iiitli iiidepeiideia 15 otitlet p,-tssages for f tiel and tir, i nozzle li,,tviiig a comi-iioli cliamber ivitli wliieh the OLLtlets comnlunic,,ite tiiid -t rotary iiiember of the ttirbilie tyl)e hivin-- propeller ind impellor iiieiiis mouiited beyoiid the outlets. 20 6. In means for feeding fine coa,l, the combili,,ttion witli t ftiel supply pipe, ,tn air stipply pipe ,tdapted to supply air to mix Nvitli the coal, t rotor member havinpropeller aiid impeller blades conceiiti-ically ai-r,,tnoed, 25 s,,tid meiiiber motinted in advance of and adjacent to the fuel outlet, and me,,tns for driving said iiiember by aii- tinder hilyli - Dt'essure. 7. Iii means for feeding fine c@oal, in combination with a fuel pipe, ,in ,tir supply pipe, i nozzle, a casiii(y iiitei-mediate said pipe and 30 liozzle,,ind having a head provided with fuel outlet passageways, a ch,,tmber body located in sii.d clsilig and in communicatio'n with a source of liigli presstii-e ,tir and haviiig ,tir oittlets to tlle iiozzle i,iid a con-ibilie(I 35 t@ I)rol)eller @iii(I im])eller meinber ino-Linted iii the ii-zzl.e t)eyojid the filieliiid air outlets aii(L ad@,ipted to receive the pressure of the streain of tir ,iiid to create t VactLilm on the fticl outlets. 40 8. In metns for feeding fiiie coal, ill coiiibiii,,ttion with .t fuel sup ly pipe, an air siipply pil@)e in coliimtiiiieitioli ivith L source of low pressure ,tir a mixing cliin-iber witli ivliieh tlle olitlets'of s,,tid air pipe and - fi-iel 4,m I)ipe coinmunicite, ,t combined propeller tnd impeller inember located adjacent the fliel outlet aiid adapted to cre,,ite a v,,ic-uum to maintain a stiction on the fuel and a source of higli pressure air in communication - iyitli 50 sttid member to drive the same. In testimony wl-iereof I affix my signature iii presence of two witnesses. LAWRENCE S. SCHMIDT. Witnesses: W. G. DOOLITTLE, J. M. GEOHEGAN.

UNITED STATES PATENT OFFI C E O LAWP.ENCE S. SCHMIDT, OF PITTSBURGH, PENNSYLVANIA. PULVERIZED-FUEL FEEDER. 1,342,135. Specification of Letters Patent. Ilateitted Jttite 1, 1920. Application filed May 11, 1917. Serial No. 167,897. l'o all whom it may concern: I Be it kitiown that I, LAwi@r@,NCE S. SCTTAIIDT, citizen of the TJnited States, residing at Pittsbur,,h, in the cotinty of Alleglieny and 0, 6 State of enlisylvania, lian,e invented cert,,tin new and tiseful Impi-ovements in Ptilv(,rized-Puel Feeders, of which the following is ,t specification. The prime objects of the present inventio-n tte to pro de a ew and improved-pulver10 , vi n ized ftiel burner of. siniple and efficient coiistruction nenv and improved fuel feed ineans wherebv a greater feeding force is irnparted to the fi-iel than has heretofore 15 been possible; ,tnd means for effecting a thorouo,h atomization of the f Liel. Witl@these objects and othei-s in view, my invention is embodied in preferable form in the constrtictions and arrtngements h6rein20 after described and illustrated in the aecompanying dra7iligs. In these drawiings, Figure 1 is a vertie,,tl section of the feedino, structure and mechanism of the burner. 25 tig. 2 is a detail section on the line 2-2 of Fig. 1. Fig. 3 is an edge view of the air pressure element illustrated in Fig. 2. Fig. 4 is a section on the line 4-4 of 30 F' I 'fig: 5 is a -vertical section of t modified form of the invention employing a positively dri-@en impeller element in connection with ,t so-Lirce of low pressure air. 35 Fig. 6 is a det-,iil front elevation of the impeller element shown in Fig. 5. I Fig. 7 is a detail edge view of the element shown in Fig. 6., Fig. 8 is a vertical sectioii of ,tnother 40 modified form of the apparattis showing the combination of a source of low pressure air with a combined propeller and impeller element driven by a current of hio,,h pressiire air. 45 Referring to the drawings and first to the constriietion III-Listrated in Figs. 1 to 4 incliisive I is a bin adapted to contain the coal dust, powdered coal or prepared pLilverized coal and which communicates with a 50 substantially Vertical oravity-feed fuel conduit pipe 2 in which is mounted a v,alve a aqapted to control the supply of fuel. TI-ie pipe 2 communicates with:,t @asing 4 preferably forming part of the main burner struc65 ture and this casing is proloiao-,ed laterall y and horizontally to provide a vacuum chamber 5 adjaceiit the innc@r horizontal end of the ctsing, atid fiie'l passageways 6 are proi,ided between the outer will of this casing aiid the wtill of a conoidal body providino, a 60 chumbel- 7, these walls bein coun(@cted 'by webs S. The passageways 6 lead to the chamber of ,t nozzle 9 Nvhich communicates at its outer end with a burner (not shown) The chamber7 communicates ,tt its outer end 65 with a lonoitudinal passageway 10 in whicli is mol-intet ,t pipe 11 adapted to communicate with a source of higlh pressure air, such as a compressioii tnd impeller pump of the ttirbine type ,ind which is not herein shown. 70 The inner end of the chamber 7 is provided with a head 12 through which extend lon(rittidinally a series of small apertu.res i3, by meaiis of whieh the air passes from the chimber to the nozzle, in parallelism to the 75 fuel throu-h the passa-eiv-.tys Mounted in the ' :no;@@7le just beyond the head of the chamber and over the fuel outlets is a freely rotatably mounted combiiied propeller ,tnd iinpeller member 14 *hich is 80 c,,trried loosely on the bolt 15 fixed to the head 12. This member is preferably of the type shown in Figs. 2 and 3 which illustr,,ttes a rotor h,,tvino,, both propeller and impeller elements tnd operating on the tur- 85 bine priiiciple ,tnd in which 16 is ,in inner series of turbine blades adapted to receive the higli pressure air from the chamber @ ivliereby the member is driven ,tnd which is provided with a,n outer concentric series of 90 t-Lirbine bltdes 1,, which constit-Lite impeller elements ,tnd which ,tet to cre,,tte a vacuum -,idjacent the fuel outlets.and in the space 5 of the casing 4 and thereb produce a suetion on the ftiel of greater force than th,%t 96 which wo-Lild be prodticed by the mere draft of the current of air past the fuel. In the operation of the device shown in Fio,,s. 1 to 4 inclusive, the ftiel is fed down the pipe 2 and .ti.r iin(ier 1-tigh pressure is 100 aclmlttec.1 to the ch,.Imber 7, ivhence it pass eg through the . smtll pass,,tgew,,tys 1 13 and strilces ,txi,,illy ,tgainst the in'ner blades 16 of the air pressiire member t4 revolvino, said member in -,i high r,,tte of speed and creat- 105 ing ,t vlicuum in the chiniber 5 immediately ,tcll@iceTit said member which will have the eff , @et of sucking in the I.-uel wiih gre,,tt violence through the ppening 6 into The chamber of the n'ozzle in which the,,I,ir and fiiel 110 will be thorou(,hly commingled and the fuel plilverized int; Ge particles which will be

c,f-rectlvc,ly c@,,rri(,ct ,tloiig by the strei:iii oL' ,i.ir throti(yh the tiozzle iiici toA),ard. tlie bi,iri-ier. Tli(, rot,,Lry iiiei-iiber l@L AA,Ill also S("rve to iiiechaiilcftlly C-lisii-iteo-i@@ite iii(I sea-Lter the fi-iel. @lt 'I 'u'j I i LI II t.loll of 'clie @Fee@l I)it)e tile llozzl(", AvIlerolo bv ,t I)owe-ii'ti-i. stielloii iii(I "Icuioii .1,,, exei-ted L,,])oii tlio ir tri(I rtiel. ;is i'ioili iii ii@ 1)1.essltr(@ clevice Iocate(t @Lt @i rroiit 15 Sli(I jliiictioll of tll(' l'itel ',Ill(l is 1)1.-o),ide(l. Ili. Fl,ys. 5 to @T is S110AY'n Ili @i,liieli the elemelit s SI oinn as tised 1.11 A@T'th @, soii-ce 20 oF lo)v 1)resstire ,iir. '@ii tli,@s -Lrriii(,Yemeiy@L the sii(I eloineiit is pro,,,i,,Ied A@,ith iii - 1)1,tcles oiii-@r and is to be, dria,cii bv iiiechani(@@il ine,,ii-is froii,). extern,,il sotre(@, of 1)oA-\,er, iii or(ler to 2 5 th@, necessirA7 i-)ressui-o foi, tl-ic@ (,re.,,itioi-L o-(' 'Iii -the :,dia(,etit ',-lie ehamber. Referrlnv to this coiastriie[ioi,,. 1.8 is tli-, co@-iclliilufor the low i:,i@esstii@e itir froiii the a@- 30 be condiicted bv iiat n-iospl-iere or from a@r licAtt@i-iE@ or @i non-eomLpressin(,r fiii. This lo", pre,;siir(, ,tir le, ids clirectly into the iiozzle tl)toiigb fi, co.i-inectin,-@ elboii, pi.,,)o se(,tion 19. 20 is tile 35 nozzle. Formecl iii flie elbo-NA, fittii-i2@ 19 is @-L fi,iel receiving 21 -wit]-i -",hi-el, (@ornmtinic:-Ltes the lo\yer en(,I. o!' @, l@tiel j)il-)e 1),3 lea,]. frt)m tli(,, cli@i;,,-,I)el, 21. into th(,, - tiozzle. A I-)oc]N, '-)4 corre40 to tl)(, ii-i the, oi' Fiffs. I to 4:. is 21@ iii(I ifi 1-.Iiis 1)0(lv @iiicl i,-i tll(" tit(, ig ill,@)ILlite(i '@q; (iriviTi@Z si),,ft 25 Ai-Iii(@li i@; to 45 siiitil)lv (-olipe(tt(@(I t( @it ii-s oii"(,r 011(l IAIlich ,,.t itS illlle,,Icent the ftiel 23 ll()Iicie(l iv@itil ,i, (Ii.-iven rneiiil,)er iiiii-)ell(,r o'c.1 50 iii.etits 27. Tii i-,Iie oivritiol) oi@ the o-rinto tli,,@ nozzl(@ ii)(11 iii(, i,,@ l'o@l 55 floANr) ttle i)it)e ti Tli(,, from the soiirce of (@Xtel-li@ll 1)("-\"Tel. in tlte lylli(tll -kvill t)rod,llce -L Stro-@lQ7 siictioli -feeci oil 'Llie fii(@T 60 ,i,Tid i, powerflil ill!2: ,Ietion tl-iercon. Tt -will be seeii tliit the @l'@orm o-ftb,e strlicturg! i-)"Irts of the o-i@ Fip-,q. 5 to 7 incli-lqil,e, 65 of the apparatlis of ri igg.. tO, 4-@ Th-Lis @or the Iiigli OI)G'Ilill!-Y 1(1' -ii-i t,lie (@,tsliig of tlio !,.tttcr consEructi@@i, tlic, sli@ti@'t 25 oT Figs. 5 to 'i iiielusive is eml)loye(I iii coliii,c(.,t'Lon Y,@ith tlic@, siitie sti-ii(@tiire of @,asiii@,-. To SOI:110 OXteilt, tllerc70 lileirlt)el. of I is il,ltisill (@,o.1-1111(@tioll Ai'l,ull 75 i,ii([ 'ii \Yh@ iticiyiber i@s to I)e 1)", I)rest, I)V @l, [)ostti,@,-e frot)@i till so@,11-ee of iiie@is ill i@ Ill this 0 -)S i's tlie, :ftic,,t i)li)e@ 29 tite ftiol (@liii-nber @iii the fOV-IlAiji,(-)- j)art of I-,lie @O ,ili ,iir iA"t]-i I)ressiire t)ii)e @31 ,iiid ,2 i,,,, ,i lo-x presstirc@ i,)i@)e (toiai- 85 iiiiiiiicating )-vitli th(@, ,iozzle At tlic, (@l' llie clianibei, 29 ,,iict o@,er 'Llic fiiol op(@iiiti(-s 34 iiict tll,c @ill@ ol-)elllll(.s 3,-) Is i rol)eller @iii(I in-i11 u L the (,oii-ibi-n(,([ -) -E til I)eller ,ilr iiiejul@)er 36 is cloill).!e go tilrijiT!(, t@r ) I 0 lia@-iiio, t-\,,To series of bl,,tde, T-neiit,,,, is illi@isirtted iii 9- ,tnd 3. This is ,tda,p(e(I to b@o, c-[I'ilTei@ by t-tie lii(,Il ir,-,SStlre Iir eoinii-i- tliroiiz'Li the ]-)il)e to tlierel)v create It s tioii oii tl-if,, cliaiilib(,r to 95 \YIii-ch 'Uhe fue'j. is fecl. The i-i'llin body o :Lir siil)plv for n-iixin,@@ A@,itli the T-Liel is obI t,,iiiied throli. ,-)-h the JoAi, 1)ressLire ,tir pi-[,)e. -YN7-hit T