US2489371A

US2489371A - Machine for spray coating hollow articles

Info

Publication number: US2489371A
Application number: US585520A
Authority: US
Inventors: John H Friden; William A Abrecht
Original assignee: SUN TUBE CORP
Current assignee: SUN TUBE Corp
Priority date: 1945-03-29
Filing date: 1945-03-29
Publication date: 1949-11-29
Anticipated expiration: 1966-11-29

Description

Nov. 29, 1949 J. H. FRlDE N EI'AL 2,489,371

MACHINE FOR SPRAY COATING HOLLOW ARTICLES Filed March 29, 1945 6 Sheets-Sheet 1 OOOO A) EN TORS A! F2925? AMA 13950197 Nov. 29, 1949 J. H. FRIDEN ETAL 2,489,371

MACHINE FOR SPRAY COATING HOLLOW ARTICLES Filed March 29, 1945 6 Sheets-Sheet 2 INVENTORS (75H H/V-WDE/V BY M44 lA WA A3950?- XZ C.

Nov. 29, 1949 J. H. FRIDEN EFAL 2,489,371

MACHINE FOR SPRAY COATING HOLLOW ARTICLES Filed March 29, 1945 s Sheets-Sheet a Ndv. 29, 1949 J. H. FRIDEN ET-AL.

- MACHINE FOR SPRAY COATIN G HOLLOW ARTICLES 6 Sheets-'Sheet 4 Filed March 29, 1945 BY MAL/AMA Jams-car Nov. 29, 1949 J. H. FRIDEN ETAL 2,489,371

I MACHINE FOR SPRAY COATING- HOLLOW ARTICLES Filed March 29, 1945 s Sheets-Sheet 5 INVEN TOR; Jamv /7 FTQ/DEA/ BY M4 MM A AB/PEcv/r AT .T 0511 5) Nov. 29, 1949 J. H. FRIDEN El'AL 2,489,371

MACHINE FOR SPRAY COATING HOLLOW ARTICLES Filed March 29, 1945' 6 Sheets-Sheet 6 ATTaEA/EY Patented Nov. 29, 1949 MACHINE FOR SPRAY COATING HOLLOW ARTICLES John H. Fridn, Maplewood, and William A. Abrecht, Union, N. J., assignors to The Sun Tube Corporation, Hillside, N. J., a corporation of New Jersey Application March 29, 1945, Serial No. 585,520

15 Claims.

This invention relates to a coating machine and more particularly to a machine, mechanisms, and a system of apparatus for coating the interior of tubular bodies.

It is highly desirable and in many cases essential that the inner surface of various tubular bodies be coated with a film of requisite thickness of a suitable substance to prevent undesirable reactions from taking place between the tubular body and compositions that may be deposited therein. For example, many present day tubes for containing medicaments, tooth paste, shaving cream, and the like are made of alloys containing lead. Unless a suitable liner or coatin of a protective film be placed between the inner wall of the tube and the substance stored therein, there is a danger of objectionable reactions taking place between the substance in the tube and the material of the tube itself.

This invention is concerned primarily with an arrangement of mechanisms and devices for quickly and effectively coating the inner surface of tubes, such as those mentioned above. To this end the instant invention includes a mechanism in the nature of a turntable comprising a base that is rotatable about 'an upright hollow shaft. A plurality of spaced upright hollow arms are carried by the base and arranged equidistant from the axis thereof. The rotary mechanism includes a series of passages each of which communicates with the interior of a corresponding hollow arm and is adapted to communicate with the interior of the hollow shaft during a portion of each complete revolution of the base about the shaft. A suitable coating material is supplied to the hollow shaft in a liquid state and flows into each arm during a corresponding predetermined portion of each revolution of the base. The upper end of each hollow arm is provided with a plurality of spaced passages establishing communication between the interior and exterior thereof and preferably arranged in a manner to jet the fluid material at an acute angle upwardly and laterally of corresponding radii of each arm. Each arm is adapted to receive a tubular body in the manner that the fluid jetted by way of the passages therein is sprayed against the inner wall of the tubes. The arrangement of these passages is such that the fluid material jetted therethrough tends to raise each tube slightly above the upper end of its carrying hollow arm and impart a rotary motion to each tube during the spraying operation. This insures complete coating of the inside of each tube.

From the rotary mechanism above discussed the tubes are placed on suitable supports mounted on an endless conveyor that is movable in a tortuous path through an oven or housing. The housing is divided by a perforate partition into an upper and a lower compartment, the path of movement of the endless conveyor and the tubes carried thereby being in the lower compartment. A blower transmits a continuous stream of a heated gaseous medium, such as air, into the upper compartment. The heated gas passes downwardly through the perforate partition and heats the lower compartment, maintaining the tubes at a temperature above the melting point of the coating material. off the individual tubes and is collected in a sump provided in the bottom of the oven. A pumphaving a screened inlet is employed to transmit the thus collected coating material while still in liquid state to the exterior of the housing for reuse or disposal as desired.

The tortuous path of the endless conveyor through the housing and the time required for any portion of the belt to pass through the housing are such that upon emergence of individual tubes from the housing, excess coating material will have drained off leaving a relatively thin film of the same on the inner surface of each tube. A blast of cooling air may be used to cool the tubes after they leave the housing, if desired.

It is an object of this invention to provide mechanisms and devices for readily coating the interior of tubular bodies.

Another object of the invention is to provide a system for placing a relatively thin film of at suitable coating material on the internal surface of a tubular body.

A further object of the invention resides in coating the interior of tubular bodies with a suitable material on a mass production basis.

This invention has for a still further object the provision of apparatus of the character indicated that is simple in design, rugged in construction, and is capable of performing its intended functions in a trouble-free manner.

With the above and other objects in View, the

invention comprises the devices, combinations,

and arrangement of parts set forth in the following detailed description and illustrated in the annexed drawings of a preferred embodiment of the invention, from which the several features of the invention, together with the advantages attainable thereby will be readily understood by' persons skilled in the art.

In the drawings:

-Figure 1 is a plan view of an arrangement of Excess coating material drains- 3 4 devices and mechanisms embodying this invendesired temperature and is then introduced into tion, partly in horizontal cross section and with blower 2'! through inlets 29 and discharged by parts broken away for better illustration; way of blower outlet 38 into upper compartment Figure 2 is a view in vertical longitudinal sec- 24. From upper compartment 24 the heated air tion of the apparatus of thislinventionhtakens passes throughperjorate, partition-22 into lower along line 2'2 of Figure 1; compartment 2% for the purpose oi? maintaining Figure 3 is a vertical transverse sectional view tubular bodies, which will be discussed further taken along line 33 of Figure along, at a predetermined elevated temperature. Figure 4 is an enlarged transverse sectional An endless belt or the like 45 (Figure 1) carview taken along line of F ur );rriesialserieslofrequally spaced upstanding pins 41. Figure 5 is an enlarged fragmentary View offal, Each pin is adapted to receive and support a Portion of g e 1, p y n ho izontal cross sectubular body 48, such as a collapsible ointment tion for better illustration; tube that is to ,be internally coated with a suit- Fi ur 6 s a top p w mar ementora able material, b tl e devices of this invention. tube supporting member; Belt 46 may passdownwardly through an open- Figure 7 is a central cross sectional view taken ing 49 in th flo in th cours of it movement along line 7 l of Figure 6; and. be qlej' bllllflfi-i through a similar opening (not F u 8 s an enlarged P pe e View O a shown), The tubular bodies 28 may be placed on Cylindrical positioning member that is locatedpins'fl at a convenient location before they substantially coaxial with and adjacent to the reach th housing tube supporting member of Figuresfi and 7:; The; apparatustot this; invention embodies; at

Fig ire -Q is a horizontal cross sectional view-- leastionerotary rnechani smor turntable device 58'' taken along line 9-9 of Figure 8; for spraying acoat-ing of asuitable material ina Figure lo is an enlarge 0p,-p1an View. of at; fluid state, such as a liquid wax intoindividualy hollowrm-d pic d in u e -3 and i ;.tubu1ar bodiesflfii- Two suchrotary mechanisms F su across sectionaleview aken al e are generally indicatedin Figure land illustrated; staggeredllinenlh-ll of Figure 10. in; detailainrffiguresfi; 4, and 5. Eachrotary Referring now. to the, drawings. wherein-like mechanis n l a o ar ub ta t r ef rence characters denote correspondin p -N upright hollow shaft 5] -secu fed;to a1 cover-plate,- throughoutltheseveralviews,- and more pailtlcu l ao;Sloverflished pan is i 4) An insert 53, 1 411 in ur s-i 1, G e a e s ra ed islocated in the low portion of the hollow oishaft thereina-housingpr.oven 'llllconsisting of a front, 5l,-and--;is provided with a blind passage Fad-that sidewa l- L airear sidewall l2, a dzend wa11sll3', communicates withaconduit 55, which, in turn, and l l, altop wall. I5, andabottoin Wall, in the; communicates witha'supplyof the liquid waxlorriatureoflaadishedipan, l6. It:Wfl1 be observed,35;othercoatin material;(notshown). Concenthatbottom wall lfii isinclined andqformed so as," trio with; shafts-1 a d; th y f b a pair ibt n at a e u 11 Also .bott mwall; (ii-sleeve members ;56-and sl'is a retar liubts. lfi extenciseforwardly of .frontv wall; I I and rear- Also concentric with sfnaftji and rotatable about wa d y f e l A518 ep fi i es f the axis thereof is a sprocket wheel 59. A base-0L, 1 and 3, the housin -1 lBH is assembled into a. turntable 6G issecuredto th lower; end of hub unita y tructure .by' means otvariousanglean M ier-rotation therewith.-- Base is formed hann a andflis maintained in d i with a series r radial passages ct, Awplurality' vated-no i ny. 93 of end ppo r of spaced upstanding hollow arms this arranged: Hi?- and= 9= A "vertical epartition-jlfl that equidistant from the axisof rotation of hub 53; at c e m wallltservesto define a a The-lowerend of each arm 52 extends into base ji a fi o partmentil within housing 10. 60,,is-secured to the base-by a screwplug 33;- and Oii fl f partition ecured to angl communicates witha; corresponding radial pasr ns 3 (Figures 2 and divides t e remainder sage (ii-through; an aperture at. A series .of raof the interior ofthe housing into an upper comdial passages: 65 extend through hub 58- and pertin 24 nd a l we r c nv y r oomparti'-SlB,8Ve 5t. Stationaryshaft 5! is provided with merit- 25.- a portefifii that-communicates with passage 54 in D sp d across end compartment 2| s insert 53..tlirei g a duct S's". As will be observedclinedheating unit sucheasa-steam-rediatorZfi, frqmlain amination ,goi Figures 4 and 5, fluid through vwhichrsteamat predetermined pressure creating material u q by d t tr n is circulated-indie.- usual manner. Positioned ssgmitted by; passage 54; duct 62?; port and pas-M within end compartment iii'aloove steam radiage each radial passage, 61; and thence tor- 25 isalblowerl'l,thatincludes ablowercasing through a ertures ts; into corresponding hollow ZB haV-ingapair. of airiinlets 29,311 l 0111718?) arms; during; a predetermined portion of each communic ting With-upper- COIIIPaItmBHt-M; complete; revolution of base 69.1 With the arl a pair of blower-rotorsil carried on ahorizontal to n ent illustrated the fi f t coating drive shaft; 32. Blower drive shaft 32 extendsmaterial into each tubulaiyarm is preventeddur-- through the front and rear side walls-of the housingth remaining; portion of each complete revoei n s o a h supp e in? r s 3, a lutionofthe base, The upperend oi -each hollow 34 mount-ed n lebracket fifithat'ale arm- 62 is closed but is provided with a plurality attached tofrontancl-rearwal1s H and l2 re- GaLof spaced pa ssa ge 35;. saarranged aim (meat, spectively A-pulleyBlis-affixed-to and rotatable coating material atan acute angle up and with the lrear endpf blower shaft 32lfor impartlaterally of corresponding radii of sash arm, as ing-g rotation to the. blower shaft through the coh in Eigures 10 and ll. In other words, the action or an open -;V-belt 38 and a drive-pulley -39; liquid coati mat rial is jetted through passages c r di h fi i electric motorrfl- ?Q; 10in amanner that-asa resultithereof the, jetted rp o tes o m m n-l r fiuigl -tendsto raise each-tubularhody 48 slightly: tQgl-OWBIT: compartment 25 through openings; 42; a .l ;;1; e its arm '62; and; imultaneously impart a and 43 in front wall H and through openings fil twirling or rotary;moye rnent;thereto, This rel-l and 45 in rear wall 12. This air-oncoming in sults in a thorough spraying and-coating of thecontacti-withisteam radiator 26is heatedto'the 'lfilinner sprfacebi each-,tubular body 3.

Disposed above base '60 is a'support H that is secured to the upper end of hub 58 and rotatable therewith. Pivotally connected to support II by means of pins I2 is a plurality of generally L- shaped levers I3 angularly spaced from each other and corresponding in number to the number of hollow arms 62. A hood I4 is fastened to each lever 13 by means of a strap I5 and screw I6. Each lever I3 also carries a hook-like element 1! for engaging a single helical spring I8 that is joined at its ends (not shown) to form a ring. Spring I8 is always in tension and tends to urge each lever I3 upwardly with respect to support II about its pivot end I2. A circular plate I9 is secured to the upper end of stationary shaft 5| and is provided with an integral depending cam member 80 which urges and maintains each lever I3 downwardly about its pivot pin I2 during a predetermined portion of each complete revolution of hub 58. And is best shown in Figure 4, cam member 80 permits spring I8 to maintain hood I4 at the left in raised position, that is to say, away from the upper end hollow arm 62. Cam member 80 simultaneously maintains hood 'I4'at the right in a position over the upper end of hollow arm 62 and tubular body 48 against the action of spring I8. In other words cam member 80 urges and maintains each hood I4 over its corresponding hollow arm 62 during a predetermined portion of each complete revolution of base 60 against the action of spring I8 and permits spring I8 to move each hood I4 away from the upper end of each arm 62 during the remainder of each complete revolution of the base. Cam member 80 is so constructed and arranged as to urge and maintain each hood I4 over its corresponding arm for at least the portion of each complete revolution of the base that the coating material is flowing upwardly through the arm and discharge passages I thereof. It is recommended that the design of cam member 80, lever I3, and hood I4 be such that the hood is spaced from tubular body 48 when it is in position over the tubular body, as shown at the right in Figure 4. This permits the fluid jetted through passages !0 to raise the tubular body and impart rotary movement thereto as indicated above.

Disposed within hollow shaft is an electrical heating cartridge 8| having a pair of electric leads 82 for connection to a suitable source of electricity (not shown).

Base 60 is normally and yieldingly coupled to sprocket wheels 59 by a spring detent arrangement 65 consisting of a section of vertical tubing 86 that carries a compression spring 81, which bears at its lower end agansit an adjusting screw plug 89 and at its upper end against a steel ball 88 for urging the ball into a recess or notch 90 in the under side of base 60.

An endless chain conveyor 9| is moved through lower compartment of housing I9 along the tortuous path indicated by the arrows by means of a series of sprocket wheels 92 and 93. An elec-- tric motor 94 (Figure 3) drives endless conveyor 9| and rotary mechanisms 50 through suitable devices that will now be described. These devices include a vertical shaft 95 that is actuated by motor 94 through sprocket wheels 96 and 91 and a chain drive 98. Shaft 95 extends through an opening 99 in top wall I5 and has its lower end disposed in a bearing I00. One of the sprocket wheels 93 is afl'ixed to the lower end portion of shaft 95 (Figure 2) and serves to actuate endless conveyor 9| upon rotation of shaft 95. The remaining sprocket wheels. 93,. as well as sprocket wheels 92, are rotatably supported in any desired manner on stub shafts I0 I. A sprocket pinion I02: is afiixed to each sprocket wheel 92, by welding:

or the like, for rotation therewith, and drives the corresponding sprocket wheel 59 through a chain in rotary mechanism 50 are placed over and adapted to be supported along their lower edges by supports I04. Radial slots I05 and I06 prevent the formation of beads of coating material on the interior of tubular bodies 48 as they serve to drain excess of the coating material by capil-. lary action. A hollow cylindrical guard I01 (Fig-r ures 8 and 9), flared at its upper end, is disposed concentric with and spaced from each support I 04 and is maintained in this position by legs I08 that are soldered or otherwise attached to endless conveyor 9|. Each guard I0! is provided with a number of indentations or teats I09 which contact the outer surface of tubular bodies 48 should any of them tend to topple over in the course of their passage through housing I0.

During the operation of the above described devices, an operator stands in front of each rotary mechanism 50 and as endless belt passes by removes uncoated tubular bodies 48 from pins 41'- and places them over the upper end of hollow arms 62. With the apparatus arranged, as illus-.

trated and described, rotary mechanisms 50 will rotate in a clockwise direction as viewed in Figthe course of rotation of mechanism 50 a quantity of the coating material, for example, waxin a liquid state, is sprayed into each tubular body 48 during a predetermined portion of each complete revolution of the base 60. Simultaneous with the injection of the liquid wax into an individual tubular body, the corresponding hood I4 will be positioned thereover. tubular bodies from being forced upwardly and oif their arms during the coating operation. Additionally, should the operator fail to place a tubular body on one of the arms, the corresponding hood will be placed over the upper end of the arm and thus confine the sprayed wax, prevent the wax from being deposited on the exterior of adjacent tubes, and eliminate the possibility of injury to the operator. After the liquid wax is sprayed into a tubular body, the operator removes it from its supporting arm with his right hand and places it on a support I04 carried by an adjacent portion of endless conveyor 9|. The conveyor then passes through lower compartment 25 where the heated air supplied through blower 21. maintains the wax above its melting point to insure excess being drained off by gravity and through the capillary action afforded by slots I05 and I06. As the endless belt emerges through the rear wall of housing I0 another operator removes each tubular body.

Hoods I4 prevent aeconcluit; I IE- to a :strainer 1" l l whichi includes a; cylindrical screen; i I [8. Strainer H i attached to; -the lower end of a rod H9 that is slidable through an. opening i-2il' in aremovableclosure ir'l'l and that carriesan operating handle. i22gat its upper end to permit of, its-,.'ready insertion and removal asrequired:through ail-opening.- I23 inyperforate partition 22;; Connected-to rotary pump ,1 i5 is a: combined hollow; drive, shaft and discharge conduit that'is actuated: bypagmoton 1,25 The liquid wax, that collectsain sump-J'lqis transmittedupwardly-by pump H5 and through conduit H24 from whenceit may. be returned; to thdsource of supply of liquid wax,,or;disposed ctr-as desired.

An exhaust pipe- I28 having a butterfly type Qfiaicontrol valve I29, is carried-.by-housing top wall; [5 Also, a hood I3 0-is; disposed over the portion of endless conveyors! that, is exterion the-rear wall l2, This hood has a fiuel 3-1 for remeving undesirable fumes:v that maybe evolved,

When themachine of our invention isoutgof, service-forany considerable period, of time, the devices embodying rotarymechanism 5i tend to cool, and the wax therein may become hardened. Electrical heating cartridge Si serves to; supply heat to the various partsof; rotary mechanism Ell which are preferably metallic and thereby; melt any wax that may have become solidified therein prior to placing the, machine in service again, 7

From the foregoing, it is believed that the COD: struction,- operation and advantages of our .pres.-, ent invention will be readilycomprehended "by: persons skilled in the art. It is to be clearly understood, however, that various changes in theapparatus set forth above may be madeiwithout departingfrom the scope of the invention, it:

being intended that all matter contained in the description, or shown in the drawings shall be interpreted as, illustrative only and not in: a lim iting sense.

We claim: -1. In apparatus of the character described, a

stationary substantially upright hollow shaft, 2.

base rotatable about the axis of said shaft, means for imparting rotation to said-base, a plurality: of spaced upstanding hollow arms carried by said base and disposed substantially equidistant from theaxis of saidshaft, and means communicating with the interior of said shaft for selectively and successively transmitting iiuid material into the interior of each of said arms during a correspondingpredetermined portion of each complete revolution of said base about said shaft, each of said-arms having a plurality of'passages establishing communication between the interior and ex terior thereof and extending in a direction generally upward and at an acute angle to corre-- sponding radii of said arms.

. 2. In apparatus of the character described, a stationary substantially upright shaft, a base rotatable about the axis of said shaft, means for imparting rotation to said base, a plurality of spaced upstanding hollow arms carried by said base and disposed substantially equidistant fromthe axis of said shaft, and means for selectively and successively transmitting fluid material into the interior of each of said arms during a corresponding predetermined portion of each complete revolution of said base about said shaft, said last mentioned means comprising a passag in said shaft, a plurality of passages in said base, each of; said plurality of passages in said base com- Jul municating with the .interiorsota-correspon'ding arm, and, I means for V successively placing said passage in said shaftqincandoutwof fluid com: munication with each: of ,said passages in said base during correspondingportions of-eachcomn plete revolution of: saidgbase.

3. In appara-tus of the character described; a stationary substantially upnightxshaft; abase rotatable about. the-axis oisaidfshaft, means for imparting rotationto said base, a plurality; of spaced upstandinghollowaarms. carried by said base and disposed substantiallyequidistant from the; axis of said shaft, and meanscfor, selectively and successively transmittingfiuid material into the interior of: each;:of vsa-idsarlms;duri a 0 1- responding predetermined; portion of each complete revolution of: said; base about'saidzshaft; said last mentionedmeans comprising a passage in said shaft, a plurality oftpassages in-saidbase, each ofsaid-pluralityof; passages in, said-base communicating withitheyintcrior of acorresponde ing -arm,; and means for successively placing said passage insaid shaft-,1 in and: out of; fluidcom: munication with-each of said passages in said base duringcorrespondingportions of each complete revolution of saidabase eachof said arms having a pluralityof ports =for discharging fluid material admitted thereto; by said second mentioned means.

4. In apparatus of the;- character descr-ibecha stationary substantially upright shaft, a base rotatable about the axis ofvsaid shaft; means for imparting rotation, to said base, a plurality of spaced upstanding; hollowarms carried by said base anddisposed substantiallyequidistant from the axis of said shaft, and/means for selectively and successively transmitting fluid-material into the interior of, eachlof saidr-arms during acorre-. sponding predetermined; portion. of each complete revolution of said-base about said shaft, said last mentioned means comprisinga passage in said shaft, a plurality .of passages in: said base, each of said plurality of passagesinisaid base communis. eating with the interior ofsa corresponding arm, and means for successiyelyeplacing said passage in, said; shaft inand:-outof -1-fiuid; communication with each of said passages in-' saids base during correspondin portions of each complete revolution of said base, eachlof said -armshaving a plus. rality ofports for-discharging-fiuid material" admitted thereto by said second mentioned means, said-ports havingtheirouter ends spaced peripherallyand being formed in a mannerto dischargesaid fluid material atyan acute-angle upwardly and laterallyof corresponding radii of' saidarm.

5. Inapparatus of-the. character'described; an upright hollow shaft, a rotary-base rotatable about the axis-ofsaid shaft, a plurality of' spaced'upstanding hollow arms carrieduby said base and (ill disposed substantially equidistant from the axis 65, of said arms into and out of communication with the interior of said hollow'shaft during a corresponding predetermined portion of each complete revolution of said base,-rotary-driving means, and means normally and yieldinglycoupling said driv- 7;; ing means to said base;

6; In apparatus of' the character described; anupright hollow shaft, a rotary base=rotatableabout the axis oi said shaft, a plurality. of spaced upstanding hollow-arms carried'eby said-base and- La; disposed;substantially equidistant from the axls of rotation thereof, a plurality of discharge ports in each arm establishing communication between the interior and the exterior thereof, means selectively and successively placing the interior of each of said arms into and out of communication with the interior of said hollow shaft during a corresponding predetermined portion of each complete revolution of said base, rotary driving means, and means comprising a spring-pressed detent for normally and yieldingly coupling said driving means to said base.

7. In apparatus of the character described, a rotary base, a plurality of spaced upstanding hollow arms carried by and rotatable with said base, means for selectively transmitting fluid material into the interior of each of said arms during a corresponding predetermined portion of each complete revolution of said base, support means associated with and extending upwardly of said base, a hood adjacent each of said arms and pivotally connected to said support means, means comprising a single spring for normally and yieldingly urging each hood about its pivotal connection with said support means in a manner to move the same away from its correspondingarm during a predetermined portion of each complete revolution of said base, and means for urging each hood over the upper part of its corresponding arm against the action of said third mentioned means during the remainder of each complete revolution of said base.

8. In apparatus of the character described, a rotary base, a plurality of spaced upstanding hollow arms carried by and rotatable with said base, means for selectively transmitting fluid material into the interior of each of said arms during a corresponding predetermined portion of each complete revolution of said base, support means associated with and extending upwardly of said base, a hood adjacent each of said arms and pivotally connected to said support means, means comprising a single spring for normally and yieldingly urging each hood about its pivotal connection with said support means in a manner to move the same away from its corresponding arm during a predetermined portion of each complete revolution of said base, and means comprising a single cam for urging each hood over the upper part of its corresponding arm against the action of said third mentioned means during the remainder of each complete revolution of said base.

9. In apparatus of the character described, a substantially upright shaft, a base rotatableabout the axis of said shaft, means for imparting rotation to said base, a plurality of spaced upstanding hollow arms carried by said base and rotatable therewith, means for selectively transmitting fluid material into the interior of each of said arms during a coresponding predetermined portion of each complete revolution of said base, each of said arms having a plurality of passages in its upper part for discharging fluid material admitted thereto by said last mentioned means, support means secured to and rotatable with said base, a hood having an open end adjacent each of said arms, and means for positioning and maintaining each hood over the upper part of its corresponding arm so that the open end thereof extends below said upper part of its corresponding arm during a predetermined portion of each complete revolution of said base and for moving each hood away from the upper part of its corresponding arm during the remainder of each complete revolution of said base.

10. In apparatus of the character described, a stationary substantially upright shaft, a base rotatable about the axis of said shaft, means for imparting rotation to said base, a plurality of spaced upstanding hollow arms carried by said base and disposed substantially equidistant from the axis of said shaft, means for selectively and successively transmitting fluid material into the interior of each of said arms during a corresponding predetermined portion of each complete revolution of said base about said shaft, said last mentioned means comprising a passage in said shaft, a plurality of passages in said base, each of said plurality of passages in said base communicating with the interior of a corresponding arm, and means for successively placing said passage in said shaft in and out of fluid communication with each of said passages in said base during corresponding portions of each complete revolution of said base, each of said arms having a plurality of ports for discharging fluid material admitted thereto by said second mentioned means, support means secured to and rotatable with said base, a hood adjacent each of said arms and pivotally connected to said support means, means for urging each hood about its pivotal connection with said support means in a manner to move the same away from its corresponding arm during a predetermined portion of each complete revolution of said base, and means for urging each hood over the upper part of its corresponding arm during the remainder of each complete revolution of said base.

11. In apparatus of the character described, a stationary substantially upright shaft, a base rotatable about the axis of said shaft, means for imparting rotation to said base, a plurality of spaced upstanding hollow arms carried by said base and disposed substantially equidistant from the axis of said shaft, means for selectively and successively transmitting fluid material into the interior of each of said arms during a corresponding predetermined portion of each complete revolution of said base about said shaft, said last mentioned means comprising a passage in said shaft, a plurality of passages in said base, each of said plurality of passages in said base communicating with the interior of a corresponding arm, and means for successively placing said passage in said shaft in and out of fluid communication with each of said passages in said base during corresponding portions of each complete revolution of said base, each of said arms having a plurality of ports for discharging fluid material admitted thereto by said second mentioned means, a support secured to and rotatable with said base, a hood adjacent each of said arms and pivotally connected tosaid support, means for normally and yieldingly urging each hood about its pivotal connection with said support in a manner to move the same away from its corresponding arm during a predetermined portion of each complete revolution of said base, and means for urging each hood over the upper part of each arm against the action of said last mentioned means during the remainder of each complete revolution of said base.

12. In apparatus of the character described, a stationary substantially upright shaft, a base rotatable about the axis of said shaft, means for unparting rotation to said base, a plurality of spaced upstanding hollow arms carried by said base and disposed substantially equidistant from arm,- and means for successively placing said pasl sage in said shaft in and out of fluid communication with each of said passages in said base during corresponding portions of each complete revolution of said base, each of said arms having a plurality of ports for discharging fluid material admitted thereto by said second mentioned means, a support secured to and rotatable with said base, a hood adjacent each of said arms and pivotally connected to said support, means for normally and yieldingly urging each hood about its pivotal connection with said support in a manner to move the same away from its corresponding arm during a predetermined portion of each complete revolution of said base, and means comprising a cam for urging each hood over the upper part of each arm against the action of said last mentioned means during the remainder of each complete revolution of said base.

I 13. In apparatus of the character described, a

stationary substantially upright shaft, a base 39 rotatable about the axis of said shaft, means for imparting rotation to said base, a plurality of spaced upstanding hollow arms carried by said base and disposed substantially equidistant from the axis of said shaft, means for selectively and successively transmitting iiuid material into the interior of each of said arms during a corresponding predetermined portion of each complete revolution of said base about said shaft, said last mentioned means comprising a passage in said shaft, a plurality of passages in said base, each of said plurality of passages in said base communicating with the interior of a corresponding arm, and means. for successively placing said passage in said shaft in and out of fluid communication with each of said passages in said base during corresponding portions of each complete revolution of said base, each of said arms having a plurality of ports for discharging fluid material admitted thereto by said second mentioned means, a support secured to and rotatable with. said base, a hood adjacent each of said arms and pivotally connected to said support, means comprising a single spring for normally and yieldingly urging each hood about its pivotal '55 connection with said support in a manner" to move the same away from its corresponding arm during a predetermined portion of each complete revolution of said base, and means for urging each hood over the upper part of each arm 12 against the action of said last mentioned-means during the remainder of each complete revolution of said base.

1 In apparatus ;of, the character described, *a stationary substantially upright shaft, a base rotatable about the axis of said shaft, means for impartingrotation to, said base, a plurality of spaced upstanding hollow arms carried by said base and disposed substantially equidistant from the axis of said shaft, means for selectively and successively transmitting fluid material into the interior of each of said arms during a corresponding predetermined portion of each complete revolution of said base about said shaft, said last mentioned means comprising a passage in said shaft, a plurality of passages in said base, each of said plurality of passages in said base communicating with the interior of a corresponding arm, and means for successively placing said passage in said shaft in and out of fluid communication with each of said passages in said base during corresponding portions of each completerevolution of said base, each of said arms having a plurality ofports for discharging fluid material admitted thereto by said second mentioned means, asupport secured to and rotatable with said base, a hood adjacent each of said arms and pivotally connected'to said support, means comprising a single spring for normally and yieldingly urging each hood about its pivotal connection with said support in a manner to move the same away from its corresponding arm during a predetermined portion of each complete revolution of said base, and means comprising a single cam for urging each hood over the upper part of each arm against the action of said last-mentioned means during the remainder of each completerevolution of said base.

l 5. In apparatus of the character described, an upstanding hollow arm having a plurality of passages establishing communication between the interior and the exterior thereof, said passages being spaced apart and extending in a direction generally upward and at an acute angle to-a corresponding radius of the arm JOHN H. FRIDEN.

WILLIAM A. ABRECHT.

REFERENCES CITED "Ihe following references are of record in the file'of this patent:

UNITED STATES PATENTS Number Name Date 7 2,077,378 Deren Apr. 20, 1937 2,221,323 Gammeter Nov. 12, 1940 2,229,631 Barker et a]. Jan. 28,1941 2,257,740 Goebel et al. Oct. 7,1941 2,359,838 Gladfelter et a1. Oct. '10, 1944