US2085765A - Method and apparatus for spraying containers - Google Patents

Description

July 6, 1937. J. F. PETERS 2,085,765

' METHOD AND APPARATUS FOR SPRAYING CONTAINERS Filed May 19, 1934 '4 Sheets-Sheet 1 July 6, 1937. J. F.1PETERSI 2,085,765

METHOD AND APPARATUS FOR SPRAYING CONTAINERS 1 vErg m ATTORNEYS.

July 6,1937. JgF. ET RS- 2,085,765

METHOD AND APPARATUS FOR SPRAYI NG CONTAINERS Filed May 19, 1954 4 Sheets-Sheet 4- W. ATTORNEYS Patented July 6, 1937 APPARATUS FOR CONTAINERS METHOD AND PATENT OFFICE srnAYrNq John F; Peters, Leonia, N. J., assignor to American Can Company, New York, 'N. Y., a corporation of New Jersey Application May 19,1934, Serial No. 725,550 9 Claims. (or. 91-45) terial solidifying upon cooling to form a oontinuous lining for the inside of 'the can. The present inventioncontemplatespreheating 10 a can and while in heated condition spraying its interior with paraflinin liquid form, which is maintained as a liquid in .a supply reservoir, and

which is conducted to and discharged from a spray head located inside ,of. the can. During the 15 spraying action the can is preferably moved relative to the spray head and the lining material is thus evenly 'deposited'on' the interior of the can, the paraflin or other coating "material being-maintained in its liquid form during the entire spraying action. I,

The discharge of coating from the spray head is regulated and controlled so that only the-proper amount of pa'rafiln isejected from the spray head and this only when the can is in prop'er'p'osition order to s'et'the coating.

Another object of the invention is the-provision (m of such a method wherein heated air under pressureis introduced into the'coating materi'al and is utilized in a spraying action and this heated air is further use'din maintaining the spraying parts clear during the interim between spraying operations.

Afurther object of the invention is the provision of a method of the character described for' coating a canwherein the can is moved while it is being coated to insure even distributionof the 50 coating material, and is then rotated-while it is being cooledto insure uniform setting of the coating material in an even thickness on the can walls.

A further object of the invention is the pro- 55 vision of a heating system in a spraying and coatto receive it. Following the spraying operation Numerous other objects and advantages of the *inventio'h will 'be"apparent as it is better underof the can holding and can rocking devices;

ing machine for keeping paraflin, or other like substance in heated and liquid condition during its passage from a reservoir in the machine t the point of its, ejection. 1

Another object of the invention is theprovision of a heating system of the character described which heats both coating material. and compressed air which are brought together or mixed and in this form are ejected as a spray.

Yet another object of the invention is the provision of such an apparatus for the coating of theinside of a nozzlecan which has onlya restricted noz' zle opening the coating material being ejected from a spray head extending through the nozzle and positioned within the can there being a relative movement between can and spray head during the coating operation, this feature insuring an even distribution of the coating material upon the can area being coated.

A still further object of the inventionis the provision of a control for the ejection of coating material from the spray head of a coating 1 machine which insures a discharge of the materia'l in time with the positioning of the can for coating.

stood from the following description, which; taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

r Referring to'the drawings; Figure 1 is a side view of a can preheating ove used in carrying out the firststep of the instant invention; v

' Fig. 2 is a side view of a can spraying machine utilized in a further step of theinve'ntion;

Fig. '3 is an end view partly broken awayof an air cooling machine for cooling cans treated by the present invention method;

Fig. 4 is a plan view on an enlarged scale of the can spraying machine of Fig. 2;

Fig. 5 is a sectional view of the machine taken .along the llnei-S in'Fig. 4 and also showing a wiring diagram embodying an electricconnec--,

Fig. 6 is a sectional view of the can holding de-' vice of the same as taken along the-line 6-6 in Fi .5; 4, Figs. '7 and 8 are fragmentary views of certain Fig. 9 is a fragmentary sectional detail of a can and a spray head; I

li'ig.- 10 is a sectional view taken through the can spray head and associated parts showing-on 5r a larger scale and in greater detail a part of the same elements that are shown in Fig, 5; and

Fig. 11 is an enlarged transverse sectional detail of the spray head stem as viewed along the line 'I ll| in Fig.- 10.-

For the purpose of illustrating the carrying out'of the various steps of the instant method on one form of container or can there is illustrated in the drawings a can A of square or oblong shape having a closed bottom and a partially closed top end which carries a nozzle B. In the description that follows this type of can will he carried through the variousoperations of coating which broadly include successively subjecting the can to'the preheating oven, to

the can sprayingmachineand to the can cooling machine,- these three machines being disclosed in the respective Figures 1, 2 and 3 of the drawings.-

Uniformly coating the interior of a can of.

this type is more difficult than would be the coating of theordinary round or more open type of can and therefore by showing how such a can is handled it will be obvious that the more simple types are equally adapted to such treatment.

The can preheating oven of Fig. 1 comprises a table -2l supported by a frame 22 over which the cans A are conveyed by a chain 23 having spaced can propelling lugs 24. The'chain o erates over a drive sprocket 25 and idler -sproc et 26 respectively mounted on a drive shaft 21 and an idler shaft 28, these shafts being journaled in the table frame 22. The drive shaft 21 may be driven in any suitable manner at a speed which will permit the cans to be heated during their passage over the table to about the temperature of the heated coating material which issubsequently applied in the spraying machine of- Fig. 2.

A hood 3| is. mountedon the table 2| and provides a pass for the cans- A moving over .the table. It is this hood which forms the oven proper and its interior is heated in "any suitable-manner as by gas flames discharged through,

' a series of gas jets 33 located below the hood which are connected to a gas'supply line 35. The cans A after being heated are taken-01f of the discharge end of-the table 21' in any suitable manner and are transferred to the spraying or coating machine of Fig. 2 which will next be considered in some detail. a

' .The stationary and operating parts of this machine are mounted on a base housing 4| which supports side'brackets 42, 43 (Figs'; '4, 5 and '6), each bracket at its upper end being formed with "spaced bearings 44, the two bearings of each v.bracket beingin horizontal'alignment and providing a sliding sup'port for-a horizontal slide shaft 45 which extends out in front and to the rear of the brackets.

A can'support cradle 46 is carried on the forward ends of the two slide shafts 45. The can cradle comprises a pair of spaced holding plates 4'|- (Figs. 4 and 6) and a pair of spaced sup-.

-- port saddles 48. Both plates and saddles may be slightly longer than the height of the can A which they support and are shaped and located to receive and hold the can with two of its opposite corners in a vertical line and the other two corners in. a horizontal line as best shown in Fig. 6. x

The plates and saddles closely fit the adjacent walls of the can when the latter isplaced in the cradle of, the spraying machine. Fora can having the shape disclosedthe plates 41 are formed with opposed curved pockets 49 which receive the horizontally disposed corners of the can and the saddles 48 are located at an angle and together form a trough which nicely fits the cans side walls adjacent its lower corner.

'The saddles 48 are mounted on a transverse support rod 5lthe ends of which are threadedly clamped in lower clamp blocks 52. Each block is suspended on the lower end of a vertical rod 53 and each rod is carried in a shift block 54 (Figs. 6 and 7) the two vertical rods 53 depending from the two-shift blocks which are arranged on opposite sides of the can cradle 46.

Each shift block is pivotally mounted on a stud 55 which is carried in and which projects laterally from a support member 56. Each of the latter is threadedly clamped on the forward end of its slide shaft 45.

In a similar manner; each plate 41 is carried on and pinned to the inner end of a short shaft 51, these two shafts extending in toward each other from their threaded-and clamped connections with clamp blocks 58 carried on the vertical support rods 53 midway of their lengths.

When the. heated can A has been removed from the preheating oven of the preceding machine just described,,it is placed in the spraying machine cradle 46 where it rests in the plates 41 and on the saddle members 48. ,At sucha time the cradle is in a forward position, that is, pulled out in the front of the machine with the slide shafts 45 extended forward totheir extreme sliding limits.

The horizontalslide shafts 45 are held together in the rear by a 'cross head 58 (Figs. 4 and 5) the ends of which are clamped in position by nuts threadedly engaging the shafts.

This insures unit movement ofthe shafts-the can support cradle and all parts carried on the shafts and cradle. can receiving position by sliding of the shafts The cradle 46 is, moved into its and this -shaft movement is cam actuated in synpivotally connected at' 62 to the upper ends of lever arms 63 (see also Fig. 5) which are pinned, one at each side of the machine, to the ends of a horizontal rock shaft 64. Shaft 64 is supported for rocking movement in bearings 55 formed in the side brackets- 42, 43.

An actuating arm is also pinned tothe rock shaft 64 intermediate the bearings and is pivotallyconne'cted at 51 to the end of a yoke 68,

the fork ends- 69 of which extend over and straddle a slide block 10 mounted on a drive shaft 1!. Collars I2 are pinned to the shaft and are located on opposite sides of the block and these prevent side movement of the latter during the rotation of the shaft. I

bearing formed in a bracket 13 which is bolted to the base housing 4|.. This shaft constitutes .the main drive shaft of the machine, and maybe rotated in any suitable manner as 'by the application of rotation to agear I4 mounted on and pinned to oneend of the shaft. eration of a machine 'of this character-may be carried out in many well known and satisfactory ways no further description will be'attempted- 'on this point other than indicating in Fi'g. 2 a

control foot clutch-treadle liby means of'which .Thedrive shaft H is journaled in a stumble Since the opan operator may start the machine for each cycle of its operation.

The drive shaft II also carries a face cam I6 Q The can cradle 46 besides having this forward and back movement with the slide shafts also has a rocking movement during which movement the shift blocks 54 and parts carried thereby are pivoted on the studs 55. This pivoting action takes place on both the forward and rear move-. ment of the shafts. It provides for more even coating as will be again referred to hereinafter. In the rocking movement when the shafts -are slid forward by' the forward travel of the connecting rods 6| these shift blocks are moved clockwise from the position illustrated in Fig. 7 into that shown in Fig. 8. Provision is made for limiting such shifting movement.

For this purpose each support member 56 is formedv with a vertical extension 65 (FigsJ: and

6) in the upper part of which a pin 86 is mounted. The pin 86 projects laterally from the member In the inserted position of a can A within the n can support cradle 46 the nozzle B of the .can

- is in horizontal alignment with a spray head 95 (Figs. 5 and 10). This spray head is held in fixed position and as the cradle is moved back by the sliding of the shafts 45 just described, the can is moved over the spray head.

In this rearward movement the cradle and can are first brought into the level or horizontal position and then the can passes over the outer end of the spray head and into the spraying .position of Figs. 5 and 10. During the entire backward movement of the can'it'remains substantially horizontal with the shift blocks 54in the position shown in Fig. I.

The spray head 95 is a complex unit and is for the most part enclosed within a hollow shell stem or tube 96 (Figs. 10 and 11). The rear end of this tube is tightly confined within a web' 91 formed in the center of a vertical column 98 which mounted on the base frame-4| and located be- The co1umn-98 indirectly supports the res-- ervoir for the paraflln and a rear bracket I (Fig. 5) is also'muunted upon the cover 99 of the tank IIII for this purpose. Column and bracket directly support a tank I 06 which is formed with an opening in its top.

The paraffin is contained within a smaller tank III'I which closes the top opening of the tank I06 and which constitutes the paraflin reservoir. This smaller tank is formed withan upper flange I08 by which it is supported and which rests on is closed at its top by an' airtight cover plate I09 which is bolted to its flange I08. a gasket II6 being interposed between the cover and the flange and forming an airtight seal. a A liquid paraffin may be supplied. to or emptied from the reservoir I0'I through a supply pipe II I controlled by a service valve II2, this pipe passing through a stuifing box I I3 carried in the wall of the tank III6. Orthe solid parafiin maybe first put into the reservoir by removal of the cover plate I09.

Theliquid parafiin for the spray drawn from the reservoir through a vertically disposed tube I I4 which extends down from the reservoir tank inside of the column 98. The lower 'end of the tube is threadedly engaged in the web 91 (see Fig. 10) as shown at II 5.

A vertical passageway II6 cut through the upper part of the web 91 communicates at its top with the lower end ofthe tube and provides a further fpassage forthe paraffin. The part of the tube or shell 96 of the spray head which extends into the column web is'pe'rforated ontop as at III and this opening, communicating with the passagewayl I6,'permits-an unrestricted flow of the liquid paraffin into the spray head.

The tube 96 (Figs. 10 and 11).is divided into an upper and lower chamber bya horizontal partition I2I which extends nearly the length of the tube but this partition terminates just short of the forward end.

The rear end of the tube is closed by a disc I 22 and an inclined partition I23 joins with or is an integral part of the horizontal partition I2I. These partitions cooperating with the, walls of the tube close off an upper rear chamber I-24 in the rear of the spray head. This chamber receives the paraffin passing from the tube H4 and'passing through the passage I I6 and the opening I I'I.'-

Anupper horizontal parafiin pipe I3I is'disposed within the upper partof the sp'ray head and rests upon the partition I2 I. The rear open end .of this pipe passes through the inclined partition I23 and extends into the chamber I24. By

sleeve I32 and is preferably formedasa double spherical terminal formed in two sections. Both sectionsare hollow and enclose a spray chamber I35. Perforations I36 are formed-,in thesphe'rical tip and through these perforations the coating material mixed with air .is atomized and ejected for the spraying operation. 5

' The spray chamber I35 is connected by a passageway I31 to a mixing chamber I38 formed in the sleeve I32. The forward open end of the paramn pipe. I3I extends into this chamber. I The 'paramn pipe 'I3I functions not only as a pas- 10 the top of thetank I06. The paraflin reservoir tube.

sage for the paraflln but its forward end coopcrates with a bulb-like valve I45 which is secured to the forward end of a valve stem I46 which extends through the pipe. The rear end'of the valve stem passes through the rear chamber I24 and out through the disc I22 in the end of the The valve stem further extends through a body I41 and a gland I48 of a stufling box which is secured on the rear face of the disc I22.

When the valve stem is drawn back the bulb parafiin pipe I3I and this closes oft flow of paraffin into the mixing chamber I38. The operation of this valve and the shutting off of the paraffin supply is associated with an electric actuating device which synchronizes the spraying operation with the movement of the can.

The valve stem is moved back to close the valve I45 under a spring action and the valve isopened by the energizing of a solenoid I49 (Figs. and which is electrically associated with the drive shaft II. A collet screw I5I connects the rear end of the valve stem to a link I52 which is carried on the end of a solenoid core I53.

Solenoid I49 is mounted in a bracket I55 which is secured on the side of the column 98. The solenoid .core projects beyond the end of the solenoid and an expansion spring I56, located on the core, is confined between a core head I51 and the solenoid. As long as the solenoid is de-' energized the spring I56 holds the valve I45 closed. Energizing of the solenoid overcomes the spring action and draws the core toward the left (Fig. 10) opening the valve.

The winding of the solenoid I49 is connected to a source of electric energy by a wire I58 (Fig. 5). This electric energy is diagrammatically indicated as a generator I59 and the other side of the generator is connected by a wire I6I to a switch I62. This switch is electrically connected to the other winding of the solenoid by a wire I63 and may be mounted, as shown, in a stationary position on the bearing bracket I3.

Switch I62 is formed with an'actuatihg spring lever which carries a roller I64, this being a' common form of electric switch. The roller I64 rides on the periphery of the cam I6 which is mounted on and turns with the drive shaft II. As long as the roller I64 holds the switch lever in the position shown in Fig. 5 current flows through the circuit and energizes the solenoid. At such a time the valve I45 is held open and the paraffin is discharging from the spray head. r

A cam segment I65 is carried on the periphery of the cam I6 and when rotation of the latter brings this cam segment under the switch roller I64, roller and spring lever are lifted and the current is broken. This allows the spring I56 to close the valve I45 and shut off the flow of paraffin from the spray head.

When the machine stops after each cycle of operation the cam segment I65 is directly under and remains in engagement with the switch roll'-,

' er so that no spraying takes place while a sprayed bottom of the tank IN. This chamber is enclosed in a cylindrical wall I13 which may be an ,integral part of the bottom of 'the'tank. The

The chamber I12 communicates with the lower end of a pipe coil "5 which is disposed within the tank IOI and the upper end of this coil is connected by a pipe II6 to a passageway III formed in the rear wall of the column 98. Passageway Ill communicates with the lower end of a vertical pipe or tube II8 (see also Fig. 10) and the upper end of the latter is threadedly secured in the web 91.

A passageway I19 is formed .in the web and communicates with the upper endof the tube "8. An opening I8I is cut through the lower rear part of the spray head tube 96 and provides a communication between the passageway I19 and a chamber I82 disposed in the lower part of the tube-below its partition I2I. Spaced inclined partitions I83, I84 are also joined to or are an integral part of the horizontal partition and these extend down and connect with the wall of the spray head tube, thus making the chamber I82 airtight.

A second horizontal pipe I88 (Figs. 10 and 11) is disposed inside of the tube 96 just beneath the partition I2I and this tube extends through the spray head in the same manner as the upper pipe I3I. The rear end of the pipe I88 passes through the partition I83 and extends into the chamber I82. Its forward end terminates in the spray head sleeve I32. A passageway I89 formed in the sleeve provides a communication between the interior of the forward end of the pipe and the mixing chamber I38.

By means of these connections the compressed air coming into the apparatus and passing through the various passageways is delivered into reservoir Compressed air may be introduced through a supply pipe I9I (Fig. 5) which is threadedly secured into the reservoir tank wall, the inner end of the pipe communicating with a port I92 formed in the flange I88 of the reservoir and communicating with a head space I93 confined below the tightly seaied cover plate I89.

Provision is made for maintaining a constant heat for the paraflin'from the time it leaves the reservoir I81 and until it leaves the pipe I3I.

This heating is efiected by the circulation'of water or other suitable fluid which passes around and along the path of travel of the paraflin so that the liquid condition ,of the coating material is maintained at all times while in the apparatus. In addition to this the compressed air passing through the coils I15 is also subjected to the heating influence of this circulating heating fluid and these features will now be considered in detail. a

The circulation of the heating fluid may be assumed to begin in the tank IIII (Fig. 5) which is completely filled with the water or other fluid. This water may be supplied through a pipe I95 (Fig. 5) containing a service valve I96, the pipe passing through the cover 99 and discharging directly into the tank.

The water is continually heated in the tank as by gas flames issuing from gas burners I 91 located under the "tank. To retain the heat within the tank its side walls are insulated at I98, this insulation being suitably held in place by an outer lining I99. a

The water fills the column 98 and when the heated currentsmeet with the web 91 they circulate through a curved passageway 20I (Fig. 10) which is cut through the lower part of the web. The upper part of this passageway communicates with an opening 202 out in-the lower wall of the spray tube 96. and water fills the lower part of the latter in front of the partition I83 and below the partition I2I this space constituting a lower chamber 203 in the spray head tube.

It will be observed by reference to Fig. 5 that the compressed air coil H5 is completely surrounded by the water within-thetank I0'I. This heats the-coil and also the .air flowing therethrough; The tube I18 and pipe I88 containing the compressed air are also surrounded by the water which thusmaintains and further heats the air up to the time it enters the mixing chamber I38.

' The partition I 2I terminates short of the rear end of the spray sleeve I32 and this provides a space 205 (Fig. 10) at the center of the tube 96 which allows communication between the lower chamber 203 of the tube and an upperchamber 206 located above the partition. The heated water thus circulates through and fills the chamber 206. Y 4

The top wall of thev tube 96 is cut through in an opening 201 which is adjacentthe partition I 23 and this opening registers with a curved passageway 208 formed in the web 91 of the column 98, its upper end opening into the upper part of c the column. The water completely fills the passageway and the column and the rising heat currents follow such apath. The upper end of the hollow column communicates with an opening 209 which is cut in the bottom wall of the tank I09 and which opensthe interior of the column to the interior of the tank. Further circulation of the heated liquid thus continues and includes water which fills the tank I 06.

It will be observed that the tube I I4 conducting the paraflin from its reservoir I01 is surrounded with this circulating heated water within the upper part of the column 98 and also that the pipe I3I- is immersed in heated'water within the upper head chamber 206. This maintains a proper heat in the liquid paraflln during its passage into the mixing chamber I30. The heated water completely fills the tank I06 and surrounds the reservoir tank I01 and this imparts its heat to the paraffin within the reservoir. A return pipe 2II'-. joins the tank I06 'with the tank IOI and. completes the-circulatory system of the heating medium. i

In this manner as heat is applied to the water are transmitted through the var. .ius passages to the variouspartspf the spray head 95 and to the tank I09. In thii way the desired temperature is imparted to the paraflin and also to the comp essed air so that the heated mixture of the two issues from the spray head in the coating operae tion. During the time the paraffin discharge isshut off the-heated air still issues from the spray head and this cleans out and keeps the perforations I36 heated and free of foreign materials..

- .The various perforations I36 (Fig. 10) are so located in the spherical tip I33 of the spray head that jets of coating material may be directed as I required and ejectedwith some force to all portions of the interior walls of the can during its movement over the spray head 95 and during the reversed movement as it is being withdrawn from. the spray head.

In addition to this back and forth movement a slight flowing action of the parafiin while it is still sufliciently warm and sufliciently liquid. The paraflin discharge from the spray head consumes a. major portion of the time cycle of operation of the machine.

This time of spraying is determined by the extent and the position of the cam'segment I65 (Fig. 5) relative to the cam I6 and may be so arranged as to start the spraying action as soon as the tip of the spray head 95 first ehte'rsinto the nozzle B of .the can. Spraying continues throughout the entire moving of the can over the spray head and also in the reverse movement until the can is about ready to leave the spray head. This latter position is about that shown in Fig. 9. Such a setting insures coating of the inside of the nozzle as well as the interior of the can.

The interiorly sprayed can may then be re-" moved from the spraying machine for subsequent cooling. Figure 3 of the drawings illustrates one form of cooling .machine which not only cools the projected from openings 2I6 formed in spaced air conducting pipes 2" arranged on opposite sides of the can. o

The rotatable frame 2I5 includes a rear flange 2I9 and a spaced front flange 2I9, the two flanges being separated by spacer tubes 22I. Flanges and tubes are held together in a rigid frame by tie rods 222 passed through the tubes. The cans are inserted endwise into this frame, the front flange having an opening for that purpose.

The rotatable frame 2I5 of the cooling machine is located in a housing 223 which also carries rollers 224 mounted on shafts 225 journaled in v bearings 226 carried by the housing. These rollers are properly grooved to retain the rotatable. frame against longitudinal displacement, the flanges 2 I8, 2I9 resting directly on and being supported by the rollers;

The rollers are also rotated in any suitable manner and their rotation is' imparted, to the rotating frame 2I5. It will be understood that the frame is stopped during the insertion and the removal of a can. The starting and stopping of the rollers 224 and with them the rotating frame 2I5 may be controlled by the operator in any suitable manner as by actua ion' of asuitable clutch treadle 22'I. Inasmuc as many well known types of driving mechanism and treadle clutch devices may be satisfactorily used on the cooling machine it is believed that further details and further description of these features are un-'- necessary for the purposes of the present invention.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form,

construction, and arrangement of parts of the chine, the combination of a heated reservoir for containing liquid coating material which is solid at normal room temperatures, a spray head for directing said heated and liquefied coating material onto a container, means for conducting said coating material in fluid condition to said spray head, pressure means for ejecting said material from said spray head onto said container, means for imparting relative axial movement to said container and spray head during the spraying operation, and means for oscillating said container on a transverse axis thereof to insure uniform distribution of the sprayed coating thereon.

2. In a container spraying and coating machine, the combination of a heated reservoir for containing liquid coating material which is solid at normal room temperatures, a spray head for directing said heated and liquefied coating material onto a container, means for conducting said coating material in fluid condition from said reservoir to said spray head, thermo-syphonic means for heating said coating material while in said reservoir and during its passage through said conducting means to said spray head, and pressure means for ejecting said heated material from said spray head onto said container, and means for imparting axial and oscillatory movement to said container relative to said spray head during the spraying operation.

3. In a container spraying and coating machine, the combination of aheated reservoir for containing liquid coating material which is solid at normal room temperatures, a spray head for directing said heated and liquefied coating material onto a container, means for conducting said coating material in fluid condition to said spray head, means for mixing compressed air with said liquefied material, thermo-syphonic means for heating said coating material while in said reservoir and during its passage through said conducting means to said spray head and for preheating said air before mixing with said coating material, said spray head directing said'mixture onto said container under the pressure supplied by said compressed air, and means for imparting axial and oscillatory movement to said container relative to said spray head during the spraying operation.

4. In a container spraying and coating machine, the combination of a reservoir for containing a coating material which is solid at normal room temperatures, heating means enclosing said reservoirfor liquefyi'ng-said coating ma-. terial, devices for holding a nozzle container in position for coating, a sprayhead for directing said coating material against the interior of the held container, while the spray head extends through the container nozzle, means for conducting said coating material from said reservoir to said spray head while maintaining it in liquid form, pressure smeans for ejecting said coating material from said spray head to.coat the container interior, and means for rocking said container on its transverse axis and relative to said spray head during said coating operation.

5. In a container spraying and coating machine, the combination of a heating reservoir for containing liquid coating material which is solid at normal room temperatures, means for heating said reservoir, a stationary spray head for receivv ing coating material from said reservoir, devices for moving a nozzle container over said spray head and'into spraying position with the latter extending through said nozzle and inside of the container, means for ejecting said coating mate-v rial from said spray head while it is inside of the container, and means for oscillating the container on its transverse axis during the coating operation.

6. In a container spraying and coating machine, the combinationof a heating reservoir for containing liquid' coating material whichis solid at normal room temperatures and which is liquefied by heat while in said reservoir, means for heating said reservoir, a stationary spray head for receiving coating material from said reservoir, devices for moving a nozzle container over said spray head and with the latter extending through said nozzle and insideof the container, means for ejecting and atomizing said coating material from said spray head while it is inside of the container, and means for moving the container during the coating operation and rocking it to insure even coating of all of its interior.

'7. In a container spraying and coatingmachine, the combination of a heating reservoir for containing liquid coating material which is solid at normal room temperatures and which is liquefied by heat while in said reservoir, means for heating said reseryoir, a spray head for receiving coating material from said reservoir, devices for imparting relative movement between a nozzle container and said spray head to the end that the latterzextends through said nozzle and inside of the container, means for ejecting and atomizing said coating material from said spray ers which comprises heating the area to be sprayed, heating'a coating material to liquefy it, spraying said liquefied coating material on said heated area, the while oscillating said container to cause an abrupt change of movement in the area being sprayed while the heated coating material is inliquefied form to permit the deposited material to flow over the coated surface whereby to evenly distribute the same, and cooling said heated and sprayed area tosolidify said coating material.

movement of the area being sprayed to; direct a I flow-of the sprayed material over the coated surface whereby to evenly distribute the thickness of the coating material over the sprayed area, and then cooling the sprayed containers.

- a JOHN F. PETERS.

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