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Oct. 11, 1938. - H. T. SCOTT 2,133,214 COATING APPARATUS Original Filed Oct. 16, 1934 5 Sheets-Sheét 1v CRWMWIL oét. '11, 1938. H. "r. SCOTT 2,133,214 COATING APPARATUS Original Filed Oct. 16, 1934 5 Sheets-Sheet_2 Oct. 11, 1938. 2,133,214 H. T. SCOTT COATING APPARATUS Original Filed Oct. 16, 1954 5-5 1 FIJ. ________,._______ l l _|_________________-_____] 5 Sheets-Sheet 5 Oct. 11, 1938. 2,133,214 H. T. scoTT COATING APPARATUS originalriled Oct. 16, 1954 5 Sheets-‘Sheet 4 WWW/mm _ Oct. 11, 1938. H. T. SCOT'II" ’ 2,133,214 COATING APPARATUS Origi?al Filed Oct. 16, 1934 ‘ 5 Sheets-Sheet 5 0/ ................. .0 m Il I, Patented Oct. 11, 1938 ' 2,133,214. UNITED ‘STATES PATENT OFFICE 2,133,214 ' COATING APPARATUS Henry T. Scott, Toledo, Ohio, assignor to The~ ' American Paper Bottle Company, Toledo, Ohio, a corporation of Ohio ' ' Original application October 16, 1934, Serial No. ' 748,563. Divided and this application October 29, 1936, Serial No. 108,258v 12 Claims. (CI. 91-46) , ' . This invention relates to coating apparatus and that all contained air is expelled. After the con particularly to apparatus for applying coatings to tainer has‘ been completely submerged it is car containers primarily intended for the packaging .ried through the pa'ra?ln bath in such manner that all of its surfaces are thoroughly exposed to and dispensing of liquids. In Patent No. 2,047,891, issued July 14, 1936, is ‘the par'aihn, the container not being positively disclosed a paper container which, while well held by any of the carrying mechanism but being adapted to serve as an envelope for commodities so transported in a carrier that it may have of various kinds, is particularly suitable for the limited movements relatively to the carrier in all directions and may freely respond, to a limited ‘ packaging of liquids. It is fabricated of relatively 10 stiff paper and is in the form of a tube of rec tangular cross section with its upper and lower ends sealed. Where liquids are to be charged into the container prior to sealing it is essential that the container in its entirety be given a coat extent, to the surging movements of the para?in 10 bath brought aboutby the operation of the mech anism. Each individual paper ?ber of the con tainer, both upon the outer and inner surfaces thereof is so exposed to the coating substance that ll ing of some substance which will render the same the container as it issues from the bath is com liquid proof so that no leakage may subsequently occur. The coating material which I may employ pletely and thoroughly coated with the impreg nating substance. 20 packaged. Where food products are to be'pack - This application is a division of my copending may vary considerably, or in accordance with the characteristics of the materials which are to be application Serial No. ‘748,563, ?led October 16, 20 ' 1934. aged, particularly milk or milk products, it is highly desirable that the liquid proo?ng coating substance should be of such character as to re main neutral in the presence of the liquid contents of the package while at the same time performing its function of preventing contact with the paper of the liquid contents of the container, thereby preventing softening of the walls of the con tainer and alsodoccupying any minute openings in 30 the paper itself ‘or between the joints of the con tainer and thereby preventing direct leakage. The mechanismv which comprises the subject matter of the present invention has been designed While primarily the coating apparatus which I disclose by way of example is designed for the handling and treating of paper containers of square cross-section, it will be obvious to one skilled in the art that, by making changes in the 25 design and arrangement of the component ele ments of the invention, the apparatus may be readily adapted for the coating of containers‘ which vary widely in shape, size and materials of construction. 30 I In the drawings: I ' especially to receive from a container fabricating machine a container of the'type shown in my Figure 1 is a view of the coating apparatus taken from the ‘side, many of the parts being shown in section and others having‘ been removed for the purpose of more fully disclosing interior patent above referred to, to move this container details; through a bath of molten paraffin to drain the ' excess parailin therefrom after issuing from the bath, and ?nally to eject the container from the 40 para?lning apparatus and to position the same so as to be readily engageable by a conveyor mecha nism for transporting _ to other apparatus for charging, closing and sealing. The container as _ _ Figure 2 is a view of the apparatus as it would be seen from the right (Figure 1) certain of the operating'parts being shown in elevation and certain parts being broken away to show the 40 underlying elements; ' Figure 3 is a" view of theapparatus-as from the left, (Figure 1) certain of the~parts being it comes to the para?ining unit has its bottom . shown in section and others partially ‘broken , 45 closed and top open. It is introduced into the ‘away; Figure 4 is a side elevation, partly broken away, bath of paraffin bottom end foremost so that the molten para?in has access to the interior of ‘the of a container receiving unit which forms part I container only after the open end of the container of the apparatus; ‘ I has been moved below the surface -of the paraffin bath. As the container ?lls 'with paramn the air which is contained therein is displaced by the paraf?n, the incoming stream of paraffin running immediately to the bottom of the container and a Figure 51s a section on line 5-5 of Figure 1; Figure 6 is a section on line 6-6 of Figure 1; 66 Figure 7 is a section on line 'I—‘| of Figure 3; Figure 8 is a section on line 8-8 of Figure 6; and e . perspective view of one of Figure 9 is a the level of the liquid rising rapidly from the bot tom toward the open top thereof thus insuring . container carriers. the 2 2,133,214 The apparatus is designed for the rapid han Idling of a continuous series of paper containers, receiving successive containers presented to it, passing these containers through the parai?n bath and effecting the discharge thereof. It is primarily intended to form portion of a rapidly operating automatic machine in which blanks are rapidly detached from a pack, erected into tubu lar form, closed at one end, coated, charged, 10 closed and sealed. 15 v20 25 30 It may of course be made to have any desired capacity and rate of operation. The casing or housing in which the bath of paraffin is enclosed and which also houses the operating ports of the coating mechanism is in dicated at III, the lower portion of this housing being especially designed for the retention of a substantial body of molten para?in while the up per portion may be of lighter construction. A removable bottom plate is indicated at H and this plate may be taken off whenever it is desired to clean the apparatus. The normal para?in level is indicated by the letter L and it will be understood that additional quantities of paraii‘ln will be introduced from time to time to replace that which passes out in the shape of surface coatings upon the containers which pass through the apparatus. A conveyor chain is indicated at |2 this chain being endless and is supported upon three sprockets l3, l4 and I5 one of which, as for instance the sprocket l5, may be intermit tently driven by any suitable mechanism. A guide l6 serves to support the conveyor chain at ' one point where it changes the direction of its travel. Mounted upon certain of the individual 35 links of this chain are container carrying ele ments I8 and there are a relatively large number of these elements, only a few being illustrated. Carriers l8 are closely spaced and the chain isso driven that each carrier is advanced from its 40 container receiving position, indicated at B in Figure 1, to its container discharging position, indicated at D, by a series of step‘ by step move ments. One of the carriers is shown in perspec tive in Figure 9 and it is shown in this ?gure at 45 the angle which it makes with the horizontal when the conveyor chain link to which it is se cured is moving in a vertical path. It comprises end of the carrier and safeguarding these ends against injury from such contact. The carriers shown to the right (Figure 1) de scend in the operation of the device and are emp ty. As each carrier reaches the position of the carrier indicated at B the motionof the conveyor chain is temporarily halted and a container is introduced into the same to occupy the position shown in Figure 9. The means for introducing the container will now be described. 10 A container receiving chute is indicated gener ally at S, this chute being vertically disposed to receive containers successively dropped into the same by mechanism which is not illustrated. The chute includes oppositely facing stationary guide plates 30 and oppositely facing swinging guide plates 3|. Plates 3| are secured at their lower ends to the upstanding side members 32 of a U-shaped‘ frame generally indicated at 33. Frame 33 has integral therewith a laterally ex tending cylindrical bearing member 34 which is rotatably supported upon a cylindrical stud 35 mounted in the end of a supporting frame‘ mem ber 36. The frame, therefore, together with the plates 3|, may swing or oscillate about the axis of stud 35 from the position in which it is shown in Figure 4 to the position in which it is shown in Figure 5. Assuming that a container is dropped into the chute with open end lowermost, as indi cated at C’ in Figure 4, the swinging motion of the movable portion of the chute, including the plates 3| and frame 33, effects the movement of the container. to the position indicated at C2 in Figure 5, the closed bottom of the container being then lowermost and the container occupying a position inclined to the horizontal. To effect this swinging movement, the frame 33 is operatively connected to a drive shaft'31, the teeth of a segment 33 integral with sleeve 34 meshing with the teeth of a second segment 39 40 pivotally mounted upon a stud 40 and segment 39 being integral with an arm 4| which is con nected by means of a link 42 with the upper end of a‘ lever 43, lever 43 being pivoted to the frame at 44 and carrying a roller 45 which lies within a camway formed within a cam 46 mounted upon shaft 31. Rotation of cam 46 therefore re , essentially a ?ve-sided. box-like member with sults in oscillation of the frame from its upper .somewhat greater interior dimensions than the 50 exterior dimensions of the container, indicated at C in chain lines, which it is to house and to transport through the bath. Any suitable means vertically disposed position to its lower inclined may be utilized for securing the rear wall of the container to a chain link and the rear wall of the 55 carrier, which faces the open side, is also provided 65 70 75 The movements of the container positioning‘ frame just described are coordinated with the movements of the conveyor chain and, when a container has been removed to the position indi cated at C" in Figure 5, it is in register with the ?n may enter the carrier and which also permit carrier B within the housing In, and also in reg the introduction of ejecting rods for effecting ister with an aperture formed in the wall of the the discharge of the container, in a manner to housing. It is therefore in a position to be moved laterally inwardly of the housing and into the be hereinafter more fully described. mouth of carrier B which is positioned to receive The other two larger walls of the carrier, indi cated at 20 and 2|, are imperforate and the wall it. The means for effecting this inward move 20 is also curved or made concave, as shown, ment includes the pusher 40' slidably mounted while the wall 2| is preferably ?at. The end upon the frame for horizontal movement, the walls of the carrier have apertures 22 formed pusher 40' having the same inclination to the horizontal as have the apertures formed in the therein to permit the free entry and escape of housing and also the carrier B. For effecting liquid paraffin. That end of the carrier which sliding movement of the pusher it is connected to is lowermost at the time that the container to be an intermittently oscillating lever 4|’ by means coated is introduced therein, is provided with an of link 42', lever 43’, and link 44', the lever 43' 70 inner central transversely extending rib 23 which . being mounted upon a fixed pivot 45'. acts as a limiting stop for the movement of the The means for oscillating lever 4| ' is not illus container toward that end of the carrier during trated, but it will be understood that any suitable the para?ining operation, thus preventing the means may be employed to operatively'connect end ?aps E of the container from striking the this lever to shaft 31 and to produce oscillations 75 with a series of apertures |9 through which paraf 60 position in timed relation to the other operating parts of the mechanism. 3 2,188,214 Frame member ‘I has a hub“ which is keyed of this lever at properly timed-intervals. Imme diately after oscillating to thrust a container 0 to stud “so as to‘ be rotatable therewith, hub laterally into the carrier B the pusher is retracted . 66 lying intermediate‘ hubs 66 and 6! ,of frame‘ and the frame 33 and blades 3| are swung to ver- - member ii. A springxpressed detent I‘! carried tical position to receive a-following container. by hub it normally hasits outer end projecting The conveyor chain is actuated and as the carrier within shallow recess 68' formed‘ in hub 62 and. just changed moves downwardly, an unloaded hence hubs 62, 63 and 68 wlllnormally rotate in carrier coming into register with the container unison about the axis of stud 04.. Secured to the i ' charging opening formed in" the housing wall and ends of ‘frame members BI and.” respectively '10 ready to receive the next following container. are the guiding and retaining blades ‘II which are 10 The carrier. B within which a container has just container holding members, having inturned outer been placed will be moved downwardly into the ends 10' to insure retention of thecontainer as para?in bath, thence horizontally toward the left the entire frame as an entirety swings’ down ‘ (Figure l) , and ?nally upwardly until it occupies 15 the position D. 1 As may be seen from an inspection of Figure 1, one of the bottom edges of thecontainer C ?rst‘ reaches the level of the upper surface of the '20 paramn and the bottom of the container is lower; most during the time that the container is actually undergoing the process of immersion so that any air originally within the same'is displaced by , molten paraffin, ?owing upwardly and making its escape from the paraf?n bath. Eventually the 25 carrier turns around the axis of sprocket l3 and assumes a horizontal position. In this movement the open side of the carrier is turned downwardly and, when the carrier has reached a completely horizontal position, as indicated at B’, is facing 30 directly downwardly, the container either resting against that wall of the carrier which has hereto fore been designated the rear wall, and which is as connected‘to the associated chain link, or resting against the curved guide plate 41 and being moved along this plate by the action of the carrier. When the carrier reaches the position indicated at B3- the container which it carries is about to wardly. ' ' - ' As will be seen from Figure 6, a container just 15' discharged from the housing ‘will occupy the posi tion C3, its open end being lowermost. It will be understood of course that as the container is ejected from the housing, the receiving‘ frame just described is in register with the aperture formed in the housing. A rotatory movement is then transmitted to the stud 64 by mechanism which is ‘illustrated in Figure 3 and is seen to include a segment 1| ?xed on stud 64, the teeth of this segment meshing with the teeth of a segment 12 pivotally supported at 13' upon a frame member. Oscillation of segment 12 is ef fected by means 'of link 14 the lower end ‘of which is connected to a lever 15 carryinga roller 16 which is-in engagement with a cam 11 mount ed on shaft 31. Two cushioning springs 18, adapted to be en gaged by one or the other. of abutment 19 respec tively on link 14, dampen shocks incidental to the operation of the ‘mechanism just described, the adjacent ends of these springs bearing against a common central spring abutment 80. By reason of the fact that the hubs of frame emerge from the para?in bath with its closed bot- , members 6| are not positively connected to the tom uppermost so that the para?in will drain rapidly from its interior.‘ Eventually, and after a further series of step-by-step movements of the conveyor, the carrier with its coated container oscillating driving studs 64 but are only releas ably connected to this stud through the inter 40 mediary of the detent 61, it is not possible for reaches the position D (Figure l) , and may then be ejected from the housing. For the purpose of 45 bringing about this ejection, an ejecting mecha nism is provided which includes a plurality of tainer come to rest after having been only par tially introduced into the rocking frame and be tween the container supporting blades 10, por 45 tion of the container‘ for instance still overlying breakage to occur should for‘ instance a con parallel ejecting ?ngers 50 supported at their 'the edge of the discharge aperture formed in the rear ends upona vertically disposed plate 5| the lower end of which is slidably supported upon 50 guide rods, one of which is indicated at 52. Each ?nger 50 is in alignment with an aper , ture formed in a perforated guide plate 53 and also in alignment with the perforations l9 formed in the rear wall of carrier D when thatcarrler has reached the discharge position shown in Figure 1. Slide 5| is operatively connected by means of a link 54, lever 55 and link 56 with the upper end of oscillating lever ll previously referred to and will be reciprocated forwardly and 60 rearwardly when lever 4| is actuated. When re ciprocated forwardly or to the left (Figure 1), the 465 housing. Should the rocking frame, including . members GI and 65, start downwardly with a con tainer in such position as this the opposition to 50 the movement of frame member BI and its as sociated blades 10 offered by the container will ‘he su?iciently great to‘ cause the detent 61 to be cammed into its receiving recess and out of recess 55 68, thus permitting rotation ‘of hub Stand frame member 65 relatively to hubs G2 and 63 and frame ' member 6|. The operator perceiving the sepa-v _ ration of the two elements of the transfer frame will stop the machine and remove the jammed container whereupon the frame member 6| may ?ngers 50 after passing through the perforations :be again swung to its normal relative position in guide plate I3 and through the registering with respect to frame member 65, the detent 61 perforations I! in the rear wall of the carrier D again entering recess 68 and releasably locking 65 will contact with the inner wall of the container " the hubs together. After a container discharged from the housing 0 housed within the carrier and will thrust this container outwardly through an aperture formed in the housing to permit its passage and into a rocking frame 60 which at that instant is posi tioned to receive it. The rocking frame 80 in-4 in a normal manner has been lowered to the posi- . a supporting stud,“ so that this frame member tor 82 which comprises an angular member the lower horizontal end of which is secured to a re tion in which it has been indicated at C4 in Fig urge‘6 it is to be removed from between the arms ‘Ill and moved forwardly into a position to be en . eludes a member 6| one end of which is provided , gaged by a conveyor. This movement from be ' with two hubs 62 and 63 rotatably mounted upon - tween arms ‘lli is effected by means of an extrac may have swinging movement about the axis of 75 stud 64. 70 ciproeable member II and the vertical portion of 76 4 2,188,214 which lies parallel to the housing wall and, in its rearmost position, lies within a recess formed within the housing wall. Member 83 is guided in its reciprocating movements by means of paral lel guides one of which is indicated at 84 and to the under side of this member is secured a rack 85 the teeth of which mesh with the teeth of a gear 86 ?xed upon a shaft 81. Shaft 81 is rotatably supported in a bearing 88 and carries at its outer 10 end a pinion 89 the teeth of this ‘pinion meshing with the teeth of a rack 90 slidably supported for longitudinal movements and carrying a roller 9| which lies within a camway formed in the rev oluble cam 82 also ?xed on shaft 31. Revolu 15 tion of cam 82 therefore results in reciprocating movement of slide 83 and hence causes the ex tractor ?nger to move outwardly between blades 18 at the proper time and to remove a container which may be standing between these blades. 20 As mentioned previously, the container will then pass on to a suitable conveyor which is not il— lustrated. The transfer frame including frame members GI and 65 is enclosed save for a con tainer outlet port formed in the forward wall 25 thereof and within this housing is located a heat into the para?in bath, to the horizontal position, the sides of the container which were previous ly vertical,‘ become horizontal and the air and moisture locked in the pores of the paper may escape more easily from these sides. Further movement of the container through the para?in bath is accompanied by rotation thereof so that the two remaining sides are in an approximately horizontal position facilitating the escape of the air and moisture. The movement of the con zontal or at least causes them to assume substan tial angles to the vertical. This is desirablelinas much as the moisture content of the paper, as well as the minute quantities of air caught in the interstices of the ?bers, are more readily dis the lower portion of a vertically disposed paper sheet will tend to re-attach themselves as they move upwardly or downwardly, as the case may be, along the surfaces of the sheet. When the sheet is horizontally disposed, or disposed at a a heating medium such as steam, as it'is desired to maintain the paraffin upon the container walls in liquid condition at this point. Also mounted 30 upon this housing is a steam chamber 94 for main of moisture or air once discharged will rapidly at the proper point‘. ' The various mechanisms described are of course actuated in a desired timed relationship, 35 a container to be coated being inserted into an empty carrier at the same time that a coated container is being ejected from the housing. I find it to be» preferable, in fabricating con tainers to be subsequently coated vwith a coating 40 substance such as paraffin, to utilize a paper which is porous in order that the paraffin may 15 lodged from horizontally disposed paper surfaces than from vertically disposed paper surfaces. Thus particles of‘ moisture and air expelled from 20 ing unit, in this case including the conduit 93, for taining the interior temperature of the housing 10 tainer through the bath is such that the container is rolled within the bath to present the several sides of the container successively to the hori substantial angle to the vertical, any particles separate themselves from the sheet by moving vertically upwardly or downwardly and will not 30 have opportunity for 'such re-attachment. It is important, therefore, that the mechanism be'of such character that the container as it passes through the bath causes each of the ?at sides thereof, at one time or another, to be disposed either horizontally or at a substantial angle to the- vertical. It will be appreciated that, due to the fact that the container has parallel opposing side walls, when it is disposed in a truly horizontal position, air expelled from the upper surface of the lower 40 penetrate into the interstices thereof. Hard ' side wall, and some air expelled from the vertical side walls may, upon rising, be intercepted by the upper horizontally disposed side wall and trapped against the lower surface thereof. Like 45 uniform over the surface of the article made papers can be rendered liquid-proof only with great di?iculty and the coating is often non therefrom. To insure that the paper used has the necessary mechanical strength and stiffness, ' and at the same time the necessary porosity, a somewhat thicker sheet is used than would be 50 necessary were the paper harder. A paper of the solid bleached sulphite type having a weight wise water expelled from the upper side wall and vertical walls will descend and be intercepted by the lower horizontal side wall. Because of the further rolling motion imparted to the container, however, any such intercepted water or air is not permitted to remain upon or cover any'spot of approximately .028 pound per .001 inch thick upon which it is originally deposited, but will be ness per square yard has been found to be satis factory. Kraft paper may also be used and also caused to flow laterally so that at one time or another every portion of the entire area of each combinations of kraft and sulphite papers. In any event, paper of the desired porosity will have a considerable nap comprising projecting '?bers or ?laments and it is desired that all of wall of the container is fully exposed to the bath. My invention. contemplates the provision of any suitable‘ means for‘ passing paper articles successively through a bath of para?'ln and by these projecting ?bers be thoroughly coated dmw ing the coating operation As the container enters the pra?in bath, the moisture and air between the ?bers of the paper is expelled by the action of the para?in. It is es sential that the spaces left vacant by the ex a clusion of moisture and air be ?lled with coating materlal so that a continuous leakproof coating is provided. As the container enters the para?in bath, its lowermost side wall is ?rst presented to the liquid paraffin in such a position that the air and moisture in the pores of the ‘paper may pass freely upward. Following, this, the then upper most side wall will be-so presented and immersed. The bottom also is disposed at such angle that the discharge of moisture and air therefrom is 75 facilitated.‘ As the container progresses further means of which the positions of the articles are so changed during their progress through the paraf?n that each of .the several sides of each 60 article are at one time or another disposed either horizontally or at an angle which so departs from the vertical that the moisture andv air particles may freely rise or fall therefrom,,depending upon the speci?c gravity thereof as compared with that of the bath. ' The carriers which I employ for the purpose of immersing the containers are sumciently large interiorly to permit limited axial and transverse movements of any container housed therein dur 70 ing the coating operation. The containers will,’v to a considerable extent, oscillate within their re spective housings in passing through the bath due to the surging of the para?in bath itself, produced by the action of the carriers which are 5 . 2433,2914 successively entering the bath upon one side and conveniently regulated by varying the depth of successively leaving it upon the other side of the the paraffin bath, lowering the level of the upper machine. The loose retention of the containers within the carriers permits the para?in to reach all surfaces of each container, both. the interior and the exterior surfaces, and the slight move surface of the bath resulting in a decreased time of immersion, and raising of the level of the upper surface resulting in an increased time of immer~> ments which each container mayhave within As each container emerges from the para?in bath it is disposed with its closed bottom end up permost, permitting the coating to flow out of the interior of the container and off of its outside sur faces. The lowermost surface of the container. its carrier are suf?cient to insure the complete and thorough coating of all the projecting ?bers. 10 It is highly important that these ?bers be coated as, in the absence of such protective coating upon a ?ber, it will absorb moisture from the air or moisture with which it comes in direct contact and'will transmit this moisture to the wall of 15 the container, thereby softening the same and decreasing, its mechanical strength. It is, of course, of equal importance that the air and moisture between‘ the interstices of the paper ?ber of the container walls themselves be ex 20 pelled and :replaced by para?in. Complete im pregnation of. the ?bers themselves by parai?n is not desired, but thorough continuous coating is essential. With containers fabricated of paper such as 25 have been described, it has been found that an immersion of substantially ten seconds produces the desired effect upon the walls thereof, the air and moisture being expelled and the projecting ?laments or ?bers being completely coated while 30 at the same time mechanical strength is main tained. Longer immersion oftentimes results in production -of containers of decreased strength due to impregnation of the ?bers. When the paper is immersed for approximately ten seconds, 35 as aforesaid, the temperature of the para?in is preferably maintained at approximately 165 175° F. It will be appreciated that with dif ferent weights and types of paper the time of im mersion will'vary and also that the temperature 40 to which the para?in has been heated will have a bearing. ‘In any case, the object will be to im merse the paper for a sufficient time to insure that its moisture'and air content is expelled, the pro jecting ?bers thereof coated, and the interstices .45 of the paper wall ?lled with paraffin. Continued immersion after these results have been achieved is detrimental. ' _ For the purpose of maintaining the paraffin at the desired temperature, suitable heating ele ments are incorporated within the housing l0. 50 Such a heating element is indicated generally at I00 and is seen to comprise a suitable tortuous conduit through which steam or other heated ?uid may be passed. Gas heated or electrically 55 heated elements may, of course, be substituted for that shown. Also, and for the purpose of heating the upper portion of the mechanism en closed within the housing, a second heating unit m is provided, this unit in the present instance 60 also comprising a tortuous conduit for the circu lation of steam. All parts of the conveyor, all of sion. ., rests on a convex surface of the carrier so that there is a comparatively small area of contact of the container with the carrier, permitting the para?in to have maximum opportunity to escape 15 between the lower wall of the container and the convex inner surface of the then bottom support ing Wall of the carrier. The duration of the drain ing of the containers may be approximately eighteen seconds, but at any ratesuf?cientliy long 20 to permit the ‘flowing off of all free ?owing para?in. . - When a freshly immersed container reaches the discharge position, in which position the carrier in which it is housed occupies the'position indi 25 cated at D in Figure 1, its walls are substantially free of excess paraffin, the draining operation‘ being substantially completed. A slight further drainage occurs, however, after ejection of the container from the carrier and during inversion 30. of the container by the mechanism previously de scribed and which is illustrated in Figure 6. Thus, after the container has been again positioned vertically ‘with closed end lowermost, as indicated at C4 in Figure 6, there is a slight downward 35 drainage along the vertical walls and this para?in when later solidi?ed, stiffens, reinforces and renders entirely leakproof the bottom section of the container, where the pressure of any liquid later introduced is naturally the greatest. ' 40' Having thus described the invention, what is claimed as new and desired to be secured by Let ters Patent is: -1. An apparatus for coating tubular ?at sided paper containers comprising a closed compart 45' ment the lower portion of which constitutes a re ceptacle for a bath of molten coating material, heating means in said compartment above the surface of the paraffin, for maintaining the tem perature of the atmosphere within the compart ment higher than that at which the coating ma 50' terial solidi?es, an endless chain within the com partmcnt and guided to have an elongated ver tical reach, and article carriers mounted on the chain and adapted to be submerged in the bath, carriers emerging from the bath being carried upwardly along said vertical reach of the chain and through a heated atmosphere to a point of discharge, whereby perfect drainage of the con 60 tainers is realized. 2. In 'a coating apparatus, in combination, a the carriers, and in fact, all parts enclosed within ' carrier member substantially rectangular in the housing, are maintained at all times at a transverse section and having an open side for temperature above that of the melting point of the introduction of articles to be retained there paramn so that any paraffin which is carried up wardly out of the bath upon the conveyors will remain liquid and fall again to the bath without by, the side wall opposite said opening having av 65 instance, the speed of the conveyor. Inasmuch minor aperture for the insertion of apusher ele~ ment to eject any article within the carrier, and a conveyor upon which‘ the carrier is mounted. 3. In a coating apparatus, in combination, a carrier member comprising an elongated box-like structure for the reception of a ?at walled tubular as the coating unit may comprise a portion of a container having opposed parallel flaps project congealing and thereby clogging the machine. The time of immersion of the containers may be varied in various ways, as by regulating for complete automatic machine, however, it is not desirable to vary its operating speed and hence 75 the time of immersion of the containers may be ing from one end thereof, said carrier having a part projecting inwardly from one end wall there of to engage a container intermediate the end 6 2,188,214 ?aps thereof and thereby prevent the flaps from engaging said end wall. 4. Coating apparatus comprising in combina , tion, a receptacle for a bath of liquid coating ma terial, an elongated boxlike carrier member polyg onal in transverse section and adapted to en velop and retain a container of similar polygonal cross-section but having a slightly smaller cross section than the carrier member so as to have 10 limited movement therein, said carrier member being provided with apertures for the in?ow and out?ow of liquid, and means for moving the car rier member into, through and out of the bath. 5. Coating apparatus comprising, in combina 15 tion, a receptacle for a bath of liquid coating material, an elongated box-like carrier member polygonal in transverse section and adapted to envelop and retain a container of similar but smaller polygonal cross-section, said carrier be 20 ing open at one side and having means at its ends to limit longitudinal movement of a con tainer therein, and means for moving the car rier member into, through and out of the bath. 6. In a coating apparatus, in combination, a carrier member comprising an elongated box like structure for the reception of a flat walled tubular container, one wall having a convex inner face upon which a container may rock when the carrier member and container are immersed. 30 7. In an apparatus for coating elongated paper containers, each having an open end and a closed end, comprising a receptacle for a bath of molten paraffin or the like, a casing above the them with their major axes inclined to the ver tical and passing them through said insertion ap erture, a conveyor enclosed by the receptacle and casing for receiving, whileso inclined, contain ers successively inserted through said insertion 5 aperture, lowering them into the bath while so inclined, lifting the coated containers from the bath and presenting the same to the discharge aperture, the conveyor being mounted for move ment in a plane and having means to support 10 the containers received and carried thereby at an angle to said plane, and means within the cas ing for successively ejecting coated containers through said discharge aperture. 9. The combination set forth in claim 8 in 15 which said mechanism includes means for receiv ing containers with axes vertically disposed and bottom end uppermost and revolving the con tainer until the bottom end is lowermost. 10. The combination set forth in claim 8 in 20 which a device is positioned without the casing and adjacent the container discharge port for successively receiving containers and depositing the same, bottom end lowermost, upon a con tainer receiving element. 25 11. In a coating apparatus, in combination, a receptacle for a bath of ?uid coating material, a plurality of article carriers, each being construct ed to retain a tubular ?at sided open ended paper container with the axis of the container at all 30 times in substantial coincidence with the axis of the carrier, and means upon which said carriers are mounted and by which they are successively ' receptacle and having spaced apertures therein 35 for‘ the insertion and discharge of containers, mechanism adjacent the container insertion aperture for successively receiving containers, p0; moved in a plane along the same endless path, a portion of which path lies beneath,'and a por 35 sitioning them with their major axes inclined to the vertical and passing them through said in 40 sertion aperture, and a conveyor enclosed by the receptacle and casing for receiving, while so in clined, containers successively inserted through said insertion aperture, lowering them into the posed that the tubular container carried therein is inclined with its axis at an angle to the hori zontal and inclined to the‘ plane of the endless 40 path in which the carriers are moving, whereby all of its flat surfaces are angularly disposed with respect to the surface of the bath during‘ bath while so inclined, lifting the coated con the immersion thereof. 45 tainers from the bath and presenting the same to the discharge aperture, the‘ conveyor being mounted for movement in a plane and having means to support the containers received and carried thereby at an angle to said plane. 8. In an apparatus for coating elongated paper 50 containers, each having an open end and a closed end, comprising a receptacle for a bath of molten para?in or the like, a-casing above the- recep tacle and having spaced apertures therein for 55 the insertion and discharge of containers, mech anism adjacent the container insertion aperture for successively receiving containers, positioning tion above, the surface of the bath, each carrier, when being lowered into the bath, being so dis- ' ' 12. An apparatus for coating tubular ?at sided 45 paper containers comprising an endless chain, guide means therefor whereby the chain is sup ported for movement in a plane, a plurality of box like open sided container carriers mounted on the chain, each being so formed and so at tached to the chain that a paper container sup 50 ported therein will have its flat sides disposed angularly to the plane in which the chain is sup ported, and stationary means for preventing escape of containers from the carriers during a portion of the travel of each carrier. HENRY T. SCO'I'I‘.