US1848885A - And norman l - Google Patents

Description

Mardi 8,- 1932- c. l.. HowsE ET Al. 1,848,835

BOIIJER CLEANER Original Filed Jan. 18, 1926 3 Sheets-Sheet l ATTORNEYJ c. 1 HoWsE ET AL 1,848,885

BOILER CLEANER y 3 Sheets-Sheet 2 March 8,1932.

original Filed Jan. 18, 1926 /6 /0 /f 53 JV LK l N VEN TOR ATTORNEYJ March 8, 1932-. C, L, HQWSE ET AL 1,848,885

BOILR CLEANER Ioriginal File@ Jan. 18, 1926 3 sheets-sheet 3 ATTORN EYj' Patented Mar. k8, 1932 .UNITED STATES PATENT OFFICE-V Y CURTIS L. HowsE, 0E DETROIT, MICistICfANfAND NCEMAN L.'f sNow, 'or NEW CANAAN, CONNECTICUT, AssIGNoR-s To DIAMOND `POWER SPECIALTY- ConoEATIoN, or

I DESDE-0inMICHIGAN,` A CoEPoEATIoN oE MICHIGAN BC'IDEE CLEANER l. 'Application ieafzranuary 18, 1926, ser1a1 No. 82,181. renewed 111081811111131r 4, 1831.v

" Theinvention' relates to boiler cleaners and has for its obj ect to provide an improved de-v vice for cleaning boilers of the type employing discharge of'aA cleaning iiuid under pressure. Referring to Lthe accompanying drawings iin which like reference characters lindicate along 2 2 of Figure 1;

Corresponding parts; y l

Flgure 1 is va transverse lsectional vlewV through the boiler cleaner showing the same applied to a locomotive boiler;`

Figure 2 is a sectional vlew in elevation Figure 3 is a detail elevational view of the blower body portion or blower head;

e Figure l is an elevational view'at the nozzle end of the body portion; f Figure 5 is an elevation view at theopposite end thereof; f 1

Figure Gis a detail sectional view along G-Gof Figure 1; s

" Figure7 isa view corresponding to Flgure 1 illustrating a modifiedconstruction of V'boiler cleaner; y l

Figure 8 is a sectional elevation view along 8-8 of Figure 7 and Inv the 'drawings vreference characters p10 respectively of a side wallwater leg 12 of a ,locomotive boiler, -13 representing the tube `sheet'and 14 the boiler tubes. 15l is a nipple Vexpanc'led'in the water leg 12 and forming an opening transversely*therethrough. f 16 rep resents a casing rela-tively'stationary Vwith respect to the nipplef15 and' provided with a portion 17 housed Awithin the nipple.v Y 18 represents the blower body' portion or blower head rotatable within the nipplel and pro- 'videdwitli 'the' axial bore`19 receiving the forward end ofthe rod 20.l This rodfis fixed` with the body portion 18 as lby aset screw 2l,y the-rod having a bearing.. in the casingpor-` vtion 22. The forwardly extending portion Y ,17 is provided with an annular shoulderk 23 -Y forming a bearing at 2i 4for the rotatable The casing 16 is providedl with a cleaning [iuid inletk at 25, 26 'being' a passageforcon;

ducting the cleaning fluid fromthe inlet lon-j gitudmally ofthe blower to a. port 27 ,.best shown in Figure 2. 28 is an inlet for a cooling fluid such as air, 29 representing apas-,jA

sage for conductin21 I to a port 30 as shown in Figure' 2.1 v

As best shown -in'F igures 3,:4-and 5,-`the' blower head or body portiony 18 is formed with a plurality of longitudinally spaced radiali ly extending 'walls 81,` adjacent wallsmthus forming cleaning fluid, conducting passages dsuch fluid from the inlet extending longitudinallyfof `the bodyl por.Y tion. As shown in the drawings, sixv of these passages .have beenprovided' andv respec..

tively designated by reference charactersiM", M2, M3, M4, M5 and Me'and their outerends form ports. These passages are of a tortuous character Vand may be formed in concentric spirals longitudinally of the blowerhead'184v lN', N2, N3, N4, N5 and'N6V are cleaningflu'id discharge nozzles respectively Vcommunicatingwith the passagesM7zM-9', M3, M4., Maand Mthe nozzles v`being directed for discharg' Vinggets ofk cleaningv fluid towardV the* tubes sheet13 and boiler tubes 14,'the nozzles varying in angularitywith respectvto the axis :of Y

the blower head asl'shown inl Figures 1 and 4 so that'as the blower head is rotated thefnoz` zles will successively direct jets of' Cleaning fluid across the tube sheet 13.'V -Intliisfmanner any desired portion of the tube -(sheet canV be cleaned for a predetermined amount of-rotation of theblower head.' 1 I i i V,The nozzles and walls 31 are preferably cast Y integrally' to formy the blower Vhead 18. ln

order to provide an inclosure radiallyofthe spiral passages, a sleeve 32 'is'provided which in assembling thev blower head may be moved intothe' position 'showninFigure 1' by slide ing the same lon-gitudinallyof the blower head in `contact with the outer extremities of lthe walls 31.", ,Y

For rotating the blower-'head 18 awo-rm,VV

Y onv ashaft 36 whichmayzbe extended-to any convenient point off/operationY fsuch- "as the l wheel "33 `is provided fixedV to. the-.rearendgof I the rod 2() and rotatable within the worm gear boiler tubes 14and- Hue sheet 13/'cleaning'fluid is admitted'to the inlet 25-and passage '26 whence it passes to the inlet port 27. ln order to rotate the blower head 18 to successively register the spiral passages and'nozzles communicating therewith with this port 27, the rod 36 is rotated, which through the l vWorniL v and wornrwhee'l 33 produces rota-'f stiony of rod 2O iandiblo'werhead 18. lVith the f-"parts' positioned asl shown in Figure 1, the-V ypassage" M4t is Ain' communication 'with the port 27'soasV to supply cleaning fluid from th'evpassage 2,6 through passage M4 to noz-y` zle N4 whichis directed toward the tube sheet 13. As thefadjacentpassage lv/ 5 is brought .jto register with port 27 by rotation of the -blmver-head 18=the corresponding nozzle 'N5 Vwillb'e directedtoward the tube sheet 13 and V will-dischargev a jet of cleaning fluid at an angle varying 'slightly withthe angle of distheport 27 and the supply of cleaning-fluid charge of thenozzle N4. yThe latter nozzle will then have its'passage/M4 rotated beyond f' will in this mannerbe cut off. By varying the; circumferential length ofthe port 27 any numberfof the nozzles may-be supplied with cleaning Vfluid from passage '26 at the-same f )time and in thissame manner the sweep A.of

f the cleaning fiuidjets maybe readily determined. As the"ipassagesv are rotated out' Aofgitn'dinally `outwardly von the blower head registration with lthe port 27 they are successively' brought into registration 'with theport30, thus admitting the cooling fluidfrom f the inlet 28. The cooling fluid will be con-. '.'ducted ,through the passages and will be discharged from the respective nozzlesthus serving to maintain the passages and nozzles at a` relati'velyflow temperature.4

- The' rod 20 ma`y be` provided with an aXialjV `bore 38 terminating rearwardly in a nipple 39, the latter passingoutwardly through a I suitableopening in the worm casing 34. `Threaded on thismpple 1s a lubricant containing cup 40, the latter being` liXedto the ynipple 39by a setscrew 41.` 42 is a cap forv the cup 4() permitting replenis'hing of the latter with a suitable lubricant. 43 is a pist0n4 fitting :closely-Vin the cup 40 and providedgwith a threaded rod 44 integral therewith. This rod is formed with a T-'head' 45 )which -operates in fthel guidesf46` for1ned in reasjon ofthe T-headf45 and threaded connection 50 between thejrod 44 vand cover 427; will i from the nozbe fed axially and inwardly of the cup 40 to force the lubricant from the cup into the passage 38. The rod 44 isA provided with an unthreaded portion 51 of relatively small diameter so that the rod 44 will free itself .fromengagernent withtheY cover '-42 as the piston 43 approaches the bottom of the cup 40. From the passage 38 the lubricant may be distributedthrough the; radialpassages '52 for lubricating the `bearing between the portion 22 of the casing land the rod 2O. 53 is a passage for conducting lubricant from the passage 38 to the anti-friction thrust bearing 37. In order to supply lubricant to the bearing 24 between the blower head 18 and the annular shoulder' 23, the mainlubricant supplyH passage 38 is Vprovided with Va'radially extending'passage for supplying lubricant `to the passage'QGat a point adjacentthe port 27. The passage of the cleaning lfluid along "passage @Gand through'portf27 will piclr up the'ilubricant from passage A54 and conduct the same to the bearing'24. A

" In this manner lubricant is supplied to any desired point, thesupply being automatically controlled and fed byoperation of the boiler Referring to Figures 7, 8 and 9, aslightly *modified construction*of'boiler cleaner is shown in 'which 'the rodA 2O is provided with apiston 55 operablein a cylinder 56.' 57 is a conduit for supplying cleaning fluid from "the-inlet Q5 to actv `on the `piston 55 whenever the cleaning fluid is being:v supplied to lthe blower head. Thus,` the blower head isfbalanced with respect to forces acting longitudinally ofthe blower head since the thrust'lonthe-blower' head against longitudinal thrusts.

The thrust bearing 37 shown in Figure 7 may be entirely dispensed )with in this construction, but may be provided for action in' the event of failure of the'piston 55. The lubricant cup 40 may be associated' with this modified form of blower element by extending the lubricant conduit through the piston 53 and the chamber56 as' clearly shown in Figure 9 of the drawings.

In' both ofthe boiler cleaner constructions shown in Figures 1 and 7 the' discharge of cleaning fluid from the nozzles will result in aV reaction force which may be resolved into two components, 'one longitudinal'4 of the blower head and the Vother transverse there- Y of. The reaction component.wh'ich'acts longitudinally of the blower head'may be 'balanced'byV the piston 55 asshow'n inhFigure 7, or absorbed by the thrustjbearings 37 'as yshown in Figures-1 and 7. Referring to Figure 7, I haveillustrated the other olf-theseV components, namely, the reaction component which acts transversely off the longitudinal axis of the yblower head by reference characf terR., Since the blower head 18 hasits bearing at 24, the moment acting on the blower head by reason of the force R may be represented by R V D. The blower head illus-l trated in Figures 1 and 7 is adapted to be. balanced against this moment by reason of v"having a cleaning fluid inlet and av cleaning lfluid supply port, a blower headv having a the force of the cleaning fluid entering the spiral passages'from theport 27, this force acting longitudinally of the blower head be-y ing represented by F. The force Fis determined bythe product of the cleaning fluid pressure times the area ofthe port 27, .the pressure against areal of the Vport 27 being effective because of the fact that the passages are not extended in a straight line longitudif nally of the blowerV head, but are arranged tortuously or spirally as shown in the draw- Y ings.` Thus the blower `head is sub]ected vto a momentV by reason of the forceF, this momentbeing represented by F X L (in which `Lis the distance ofthe point V of application of force F to the center of movements) which acts in opposition to the moment R X D and to substantially counter balance this moment. Thus by properly proportioning theseaparts the blower head. may be balanced against forces acting transversely of the blower head., f

lWhat we claim as our invention is l. A boiler cleaner. comprisinga casing having a cleaning fluid inlet and a Vclear'iing fluid supply port, a blower head having'ra plurality of ports, means for moving the` blower head relative tothe casing for successively supplying cleaningfiuid from said supply port to saidblower head ports, .and

a plurality of nozzles communicating through e tortuous passages with said blower head ports respectively, the said passages, being soar ranged as to conduct the cleaning fluidin such a course that the latter resiststhereaction of the cleaning fluid escaping from the nozzles.

2. A boiler cleaner comprising a fluid supply port,a blower head havinga plurality of ports', means for moving the blower head relative to the casing for successively supplying cleaning fluid from said supplyr port to said blower head ports, and a plu-y blower head relative tothe Vcasing'for suc-vv vrcessively supplying cleaning fluid fromsaid casing having a cleaning fluid inlet anda cleaning'` supply port tousaidblower head ports,y and a plurality of nozzles communicating through passages spirally Yformed around the axis of 'said rotationfwith 'said blower head ports respectively, the said passages being so ar-v rangedas to conduct the cleaning fluid -in such ,af course that the latter 'resiststhe r-e'- nozzles. f v Y 4. A boiler cleaner comprising a casing 4action of the cleanin `fluid esca in@ from the plurality of ports', means for moving the Y -liaving a cleaning fluid Ainlet and a cleaning fluid supply port, a blowerhead having a-pluerv rality ofports, means forv rotating'the blower Y head relative te theA casingfor successively y supplying cleaning fluidv from said supplyv port tojsaid blowerhead portspand a plus ra-lityv of nozzles comniuiiicating through passages spirally formed around the axis of saidrotation'with said blower head ports re-k respectively, said'passages being so arranged as to conduct the cleaning fluid in suoli a course that the latter-resists V'the reaction of 1 the cleaningfluid escaping` from the nozzles,

said nozzles varying in angularity with re- I spect to the axis of the blowerhead.l Y GLA boiler .cleaner comprising ac'asing having acleaning fiuidinlet and a supply port,fa blower head havinga plurality offdischarge nozzles and spirally extending cleaning duid supply passages therefor, and means for rotating the blower head for causing successive registration of the said cleaning fluid supply passages with said' supply port, said spiral passages beingfornied concentrically withrespect tothe axis of rotation of the blowerhead.,` e y 7, blowerconiprising a plurality of nozzles adapted to discharge cleaninglfluid 'ad--` Vjacentuparts of a boiler'to be cleaned and havingpassages respectively V:corninunieating 5F? with said nozzles for conducting cleaning fluid[thereto froma source ofsu'pply, Asaid 1 passages being vformed;spirally aboiitlacom mon axis` 812A. rotatableblower rcomprisinga plurality of nozzles adapted tc scliargeY cleaning fluid Vadiaceiitparts ofa boileivto be cleaned A andliaving passages respectively communi-j catingwithsaidnozzles for conducting clean-v j fluid the-retoffrom asouice; of si'ipply said passages being formed spirally around the aXis of rotation of the blower.

9.` A rotatable blower comprising a iplurality of nozzles adapted to discharge cleaning fluid adjacent parts of a` boiler to be cleaned and having passages respectively communieating with said nozzles for conducting cleaning fluid thereto from a source of supply, said passages being formed spirally around `the axis of rotation of the blower, said nozzles varying in angularity with respect to said axis of rotation. Y

l0. A blower comprising a nozzle adapted to discharge cleaning fluid adjacent parts of a boiler to be cleaned and having Ia passage communicating with the nozzle for conducting cleaning fluid thereto from a. source of supply, said passage being formedspirally and being so arranged that the-cleaning fluid as it flows through the passage creates a force which tends toA balance the reaction of the cleaning fluid escaping from said nozzle.

ll. A boiler cleaner comprising a casing havinO a cleaning fluid inlet and a supply port, a blower head having a plurality of ports, means for rotating he blower head for successively supplying cleaning fluid from said supply port to said blower head port-s, a plurality of nozzles carried by the blower head adapted upon rotation of the blower head to supply jets of cleaning fluid successively toward predetermined parts of the boiler to be cleaned, said blower head having a plurality of spirally arranged cleaning fluid conductingv passages respectively connecting the said nozzles and blower head ports, each of said passages being so arranged that the cleaning fluid as it flows through the passage creates a. force which .tends to resist the reaction of the cleaning fluidy escaping from the nozzle of the passage and means for automatically preventing the supply of cleaning fluid to such nozzles as are not directed to a predetermined portion of theboiler.

l2. A boiler cleaner comprising'al casing having a cleaning fluid inlet and a cleaning fluid supply port, a blower head having a plurality of ports, means for moving the blower head relative to the casing for successively supplying cleaning fluid from said supply port to said blower head ports, a plurality of nozzles communicating through tortuous passages with said blower head ports respective ly, vand means for introducin a cooling fluid to at least one of the said tortuous passages when their respective blower head ports are not in registration with said supply port;

13. A boiler cleaner comprising a casing having a cleaning fluid inlet and a cleaning fluid supply port, a blow-er head lhaving a plurality of ports, means for moving the blower head relative to the casing for successively supplying cleaning fluid from said supply port to said blower head ports, a plu-` rality of nozzles communicating through spiral passages with said blower head ports respectively, and means for introducing a cool-y ing fluid to at least one of the said spiral passageswhen their respective blower head ports are not in registration withl said supply port.

la. -A boiler cleaner comprising a casing having a cleaning fluid inlet and a. cleaning fluid supply port, a blower head having a plus rality of ports, means for rotating the blower head relative to the vcasing for successively supplying cleaning fluid from said supply portv to said blower head ports, a plurality of nozzles communicating through passages spirally'fo'ri around the axis of said relative rotation, and means for introducing a cooling fluid to at least one ofthe said spiral passages when their respective blower head ports'are not in registration'with said supply port.

l5. A boiler cleaner comprising a casing having a cleaning fluid inlet and a cleaning fluid supply port, a blower head having aphirality of discharge nozzles and spirally formed cleaning fluid conducting passages for said nozzles,` and means 'for moving the blower head relative tothe casing 'for successively supplying cleaning fluid from, said supply port through said passages to said discharge nozzles, and means for introducing a` cooling fluid to atleast one of the said spiral passages when theirv respective blower head ports are not in registration with said supply port.

16. A boilercleaner comprising a casing having a cleaning fluid inletand a supply port, a blowerhe'ad having a plurality of ports, means forrotatingl the blower head for successively supplying cleaning fluid from said supply port to said blower head port-s, a plurality of nozzles carried bythe blower head adapted upon rotationV of the blower head to supply jets of cleaning fluid successively toward predetermined parts of the boiler to be cleaned, said blower head having a plurality of spirally arranged cleaning fluid conducting passages respectively connecting the said nozzles and blower head ports, means for automatically preventing the supply of cleaning fluid to suoli nozzles are not directed to a predetermined portion of the boiler, and means for introducing a cooling fluid to at least one'of the said spiral passages when their respective blower head ports are not in registration with said supply port.

j 17. A boiler cleaner comprisinga body portion provided with a cleaning fluid conducting passage extending longitudinally thereof, a cleaning fluid discharge nozzle communi-cating with'said 'passage and arranged to discharge a jet of` cleaning fluid transversely of said body portion,` said V.j aassage being constructed so that when the cleaning tfluid is admitte'd'theretothe saidfbody portion will be subjected to a `force substantially'balanc-l ing with said passage and arranged to dis-- ing the thrust resulting from saidV transverse discharge. 18. A boiler cleaner comprising a body portion provided witha cleaning fluid conducting passage extending longitudinally thereof,

a cleaning iiuid discharge nozzle communicat` charge a jet of cleaning fluidy transverselyci*l said body portion, said passage being formed spirally and being so arranged that when the cleaning fluid is admitted thereto, the Said body portion will be subjected to a force opposing the transverse thrust incident tc said transverse discharge.

19. A boiler cleaner comprising body por-l tion provided Awith a plurality of cleaning lluid conducting passages extending longitudinally thereof, cleaning fluid discharge nezzles communicating with said passages respectively and arranged to discharge jets of cleaning fluidtransverselyof said body portion, said nozzles varying in angularity relative to the axis of said body portion and said passagesbeing constructed so that when the cleaning fluid is admitted thereto, said'body portion will be subjected to a force opposing the transverse thrust incident to said: transplurality of ports, means for moving the blower head relative to the ,casing for' successively supplying cleaning iiuid from said supply port to said blower vhead ports, a plurality of nozzles communicating through passages with said blower-head ports respectively, said nozzles varying in angularity rela- V tive to the axis of the blower head and -being arranged to discharge transversely of the blower head, and said passages being constructed so that when the cleaning fluid is ad- ,initted thereto the said blower head will be u subjected to a force opposing thetransvers'e thrust, incident to said transverse discharge.

22. A boiler cleaner provided with a body portion having a cleaning fluid discharge nozzle arranged to discharge 'transversely of said body portion, and means for supplying cleaning fluid to'said nozzle,`said means befv ing adapted upon supply of cleaning iiuid to the nozzle to substantially balance the reaction thrusts incident to said transverse discharge. g

23. A boiler cleaner provided with a body portion having av cleaning fluid discharge nozzle arranged to discharge obliquely to the axis o'fsaid body portion, said bodyportion having v'a i cleaning fluid conducting passage 'arranged'to substantially balance 'the trans' verse vthrust incident to #said oblique discharge'upon passage ofcleaning fluid therei through, said `body portion being construct,VV ed with? a piston, and :means for supplying cleaning fluid toact on said-piston 'to substantially 'balancethei longitudinal thrust incident to said oblique discharge.

Y '2a- A boi-ler' cleanerv comprising-a casing ll'iaving a' cleaning "fluid-inlet and acleaning fluid;'supply port,ra' blower head having a pluralityV of tports', means for movingfthe blower'relative to the' casing for successive-` ly'supplying cleaningA Huid from said-supiAV ply port to said blower head ports,la plural ity of nozzles communicatingthrough pasly, theV arrangement of said nozzles being such' vsageswith said blower head ports"respective-w v asto produce a 'reaction thruston- .thegblower head longitudinally thereotupon discharge ofcleaning-fluidtherefrom and cleaninglluidY operated means dependent uponthef passage`v` of cleaning tlui'dtosai'dnozzles for siibstanf,

tially'balancingthe blowerhead. 4;i

Y 25; VIn combination, a'boilerfcleanerhavingZV77 a; cleaning fluid discharge nozzle," ,means-in# cluding a movable member for'varyingfthe directionof the Adiseharge'inozzle',='and means dependentiuponthe iirst saidf. means forv sup'v plying f a lubricant zto said `movable member;

z 26. rln lfa boiler; cleaner, a' blower head havf ing.l aclean'ingffluid dischargenozzleeans including a shafty for limparting rotation tol said-blowen head, abearing for-'said"shaft, K

n and ineansactuated by said first named means forz-supplyingga lubricant'ftosaidshaftand bearing.` 4 Y 2.7i In icombinataon; a boiler clean'erehavingl a .cleaningitluidadischarge nozzle, rmeans in-If`l i cluding 'movable member for varying the direction of the .discharge-nozzle; and meanslv dependent upon thefirst. saidmeans 'for supf plying a lubricant lto said' movable member-yV said-last named means including a lubricant containery andgla. i'elatively.movable plunger operating in said containenf 281; iA'zboiler: cleaner comprisingfay casing having a cleaning fluid inlet and a cleaning tluid Vsupply( port,.a` .blower head having a pl'urality'otports," means for moving the blower head relative tothe casing for successively supplying cleaning fluid from said' "d supply port to'said blower head ports,a plu,`

rality of nozzlescommunicating through passages with said blower headl ports respe'ctively,'said blower head having a bearing in said casing,- and means dependent upon thel 'movement ci the blower head relative to the casing lfor lubricating said bearing.

L291A boilercleaner comprising a casing.,

having aA cleaning fluid inlet and a cleaning '5 fluid supply port, azblower head having a plurality' oiports, means for rotating the blowerhead relative to the casing kfor successively supplying cleaningv fluid- -frorn said supply port tosaid blower head ports,` a plurality of nozzles communicating throught passages'spirally formed varound the axis ofV said rotation-with said blower head ports respectivelyysa-id blower headhaving a'bea-ring in said casing,V and means; dependent upon the rotation ofthe. blower headrelative to the casing for lubricating said bearing.

30.y yA boiler cleaner comprising a-no'zzle adapted to discharge a' jet of -cleaning fluid for cleaning'the-tubeisheet of a 'locomotive' boiler, means for moving said nozzle to vary the Ydirection of discharge of said jetofcleaningl fluid, relatively stationary means anfording, a bearing for'saidnioving means,r and Vmeans'dependent' upon 'movement of the nozzleffor forcibly supplying alubricant to said bearing.; l

BLA boiler clea'ner-A comprising a nozzle adaptedfto discharge a jet'of'cleaningfluid7 nieansfor 'moving said: Vnozzle tovary the direction-"of/discharge of said jet of cleaning fluidfrelativelyf stationary means aiiording a `bearing for said ymovable means, land`frnovable meansz' operable' upon `movement of said nozzle for forcibly supplying a lubricant to said bearing. 32.? 'Thecornbination with a blower element having a cleaning Huid dischargenozzle5 of a cleaning fluid-conducting passage for said nozzle5 'the-said' Apassage being so arranged that the cleanin'gliiliuida-s it 'fl'ws through lche passage creates a force whichftends'toires'i'st theereaction' of the cleaning Afluidescaping froinfthe'said nozzle'. v y

\ 83. ;A- boiler cleaner including -in combination a fixed casing, a blower head Inountedat one end on the said casing, the saidblower head being rotatable about its longitudinal axisfnozzles arranged at the free end of Jche blower head,v and spiral passages in the" said head for conducting cleaning fluid to the' said-nozzles, the said spiral passages being arranged'to have their inlets and outletsvon opposite sides of the 'longitudinal axis of the said blower head.

' In testimony whereof we ax'our signatures.

CURTISl L; HOWSE. NORMAN L.` SNOW.

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