Патент USA US2109489код для вставки
March 1, 1938. J. D. LE FRANK 2,109,489 LIQUID FILLING MACHINE Filed Sept.. 19, 1935 3 Sheets-Sheet l Lg s 4,4 47 4f ¿à f I áY rrá ¿Ä Yi,”INVEN’ToR?vY ¿0. ATroRNEYs March 1, 1938. J_ D, LE FRANK . 2,109,489 LIQUID FILLING MACHINE Filed Sept. 19, 1935 3 Sheets-Sheet? March 1, 1938. J. D. LE FRANK 2,109,489 LIQUID FILLING MACHINE Filed Sept. 19, 1935 OPGaAsRPessuœ-_ëgT-ZÜ . From Source . ` 3 Sheets-Sheet 3 - . A í'/ i l l m/ a ë/ / l Patented Mar. 1, 1938 2,109,489 UNITED STATES PATENT oFFicE 2,109,489 LIQUID FILLING MACHINE John Daniel Le Frank, Maplewood, N. J., assignor to American Can Company, New York, N. Y., a corporation of New Jersey Application September 19, 1935, Serial No. 41,311 7 Claims. (Cl. 228-115) The present invention relates to a machine constant pressure on the liquid remaining in the for filling cans with liquids that have a tendency to- foam and has particular reference to devices which minimize foaming of the liquid passing 5 into a can, passages in the devices being auto matically purged of any foam which may have u which may be carried over into the venting de containing the liquid. This liquid is held under a der pressure which is directed through the vent ing passageways to blow out or purge them of any liquid or foam which may have accumulated during the filling of a preceding can, thereby preventing the trapped liquid or foam from. being injected into the can under fill which action min imizes foaming of the liquid during filling. Another object is the provision in such a filling machine of devices for establishing a direct com munication through the venting passageways be tween the can interior and the reservoir head space'after the can is charged with the pressure fluid so that the liquid or foam purged from the venting passages is carried over into the reser voir, the establishing of the communication ef fecting a conflux of the can and reservoir head space fluids and also effecting a balancing of 35 their pressures so that the liquid will now from the reservoir under the pressure of its hydro static head and with a gentle flowing action as the liquid enters the can, A further object is the provision of a liquid 40 filling machine of this character wherein cans to be filled are vacuumized, before they are charged with the fluid under pressure, to prevent dilution of the pressure ñuid in the reservoir head space, and to further prevent contamina 45 tion of the liquid in the reservoir when corn munication is later established between the res ervoir head space and the can interior. 50 ` vices at such time. Numerous other objects and advantages of the invention will be apparent as it is better under 15 fluid pressure above atmospheric pressure which is created in a head space above the liquid and the can is charged, before iilling, with a fluid un 30 ' accumulated during the filling of a preceding An object of the invention is the provision of 25 ‘ Still another object is the provision, in a filling head for such a machine, of devices for venting the can during its filling and for trapping and retaining against dripping, any liquid or foam can. 10 a liquid filling machine having a filling head adapted to receive a can to be filled with a liquid and also having devices for venting the can, dur ing the filling operation, into a closed reservoir 2 reservoir. Another object is the provision of such a liquid filling machine wherein the pressure fluid pre viously charged into a can to be filled is caused to flow, during the filling operation, from the can directly into the reservoir head space as it is displaced by the filling liquid, this feature con 55 serving the fluid and maintaining a substantially stood from the following description, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof. Referring to the drawings: Fig. 1 is a fragmentary part elevation, part Ver tical sectional view of one unit of a can filling ma chine embodying the instant invention showing the valve in an initial position with all ports closed; Fig. 2 is a fragmentary vertical section of the valve showing it positioned for the vacuumizing step; Fig. 3 is a horizontal section of the valve taken substantially along the line 3-3 in Fig. 2; Fig. 4 is a top plan view of the machine unit shown in Fig. 1, with parts broken away; Fig. 5 is a fragmentary horizontal section taken substantially along the line 5_5 in Fig. 1; Figs. 6, '7 and 8 are fragmentary vertical sec tions of the valve taken substantially along the respective lines A-B, A-'l and A-8 in Fig. 5 as regards the stationary parts of the valve body and sho-wing the movable part of the valve posi tioned in the respective figures for filling the vacuumized can with pressure fluid, for bal ancing off with the reservoir head space, and for the liquid filling step; Figs. 9, l0 and 11 are horizontal sections of the valve taken substantially along the respective lines 9--9, lll-lll, Il-Il in Figs. 6, 7 and 8; and Fig. 12 is an inverted plan section taken sub stantially along the line l2--l2 in Fig. 'l and looking up in the direction of the arrows. In the machine unit illustrated in the draw ings as a preferred embodiment of the invention, empty open top cans a are positioned on a verti cally movable support located under a valve con trolled filling head. The filling head is secured to the side wall of a reservoir which contains the liquid to be filled into the cans. This reservoir is designed for holding the liquid under a fluid pressure above atmospheric pressure and is par ticularly adapted for liquids having foam form ing tendencies when agitated, such as beer, ale, 25 0 2 2,109,489 carbonated Waters and any liquids having like characteristics. The can is lifted vertically so as to bring its top flanged edge into engagement with a resil ient sealing ring located in the bottom of the fill ing head (Fig. 1). rI‘his ring seals off the can in terior. While the interior of the can is sealed off a valve in the ñlling head is rotated into certain 10 positions for establishing predetermined com munications with the can interior. The first of these (Fig. 2) opens the can interior to a suitable source of vacuum which vacuumizes or exhausts the air from the can. 'I'he second position of the valve (Fig. 6) causes 15 a fluid under pressure to be introduced into the can which creates a pressure therein above at mospheric pressure and preferably in excess of the pressure in the reservoir head space above 20 the liquid. This fluid may be of any suitable character which will not contaminate the filling liquid. The fluid is preferably the same as that with which the liquid is charged or the same as generated by the liquid. In the case of beer, ale 25 or carbonated waters this fluid is preferably car bon dioxide. y A further rotation of the valve cuts olf the fluid pressure >communication and establishes di rect communication (Fig. '7) between the can 30 interior and the reservoir head space above the liquid. This permits the fluid under pressure in the can to ñow directly into and to mix with the fluid in the reservoir head space until the can pressure and the reservoir pressure become bal 35 anced. This direct communication feature greatly simplifies the construction and operation of the machine and renders unnecessary intri cate pressure equalizing systems and mechanism while at the same time permitting the use of a 40 pressure iluid which beneficially reacts on the liquid being filled. While this equalized pressure condition pre vails the valve is turned to another of its posi tions (Fig. 8) which establishes communication 45 between the can interior and the liquid in the reservoir. At the same time communication be tween the can and the reservoir head space above the liquid is maintained. This causes the liquid in the reservoir under pressure of its hydrostatic 50 head to flow into the can against the iluid pres sure therein. The filling action is quiet and the liquid flows gently and with minimum foaming, the liquid being directed against the interior side wall of the can to assist in this quiet filling. While the filling takes place the liquid rising 55 in the can displaces the fluid and forces it over into the reservoir head space through venting passageways in the ñlling head. In this manner the iluid charge is preserved against loss and is 60 utilized to augment the reservoir pressure above the liquid and to maintain substantially a con stant pressure on the liquid notwithstanding the increasing head space formed by the liquid being drawn out. In order to insure that the can is completely 65 filled the liquid is permitted to rise into the fill ing head and the vent passageway to substantially the level of the liquid in the reservoir. Thus when the valve is closed the liquid in the vent 70 passageway above the valve is trapped and the liquid in the vent below the valve is held captive by capillary attraction in a suitable trap provided in the lower end of the vent. This prevents drip ping of the liquid from the head after a filling 75 operation. When the can is iilled a final step rotation of . the valve (Fig. l) cuts oil the flow of liquid. This completes the valve cycle. The filled can is now removed from the filling head and lowered to its original position by descent of its support and may then be discharged from the machine in any suitable manner. At the next ñlling operation the passageways retaining the residual liquid, left when the final valve position is reached as has just been de 10 scribed, are purged or blown out so that unde sirable liquid or foam will not be introduced into the next can before the actual filling liquid en ters. The lower vent is purged during the vac uumizing of the can interior, the vacuumizing op 15 eration causing the captive liquid to be drawn out with the air. The upper vent is purged by the flow 0f the pressure iluid from the fluid ñlled can before its liquid iilling, the establishment of communica 20 tion between the can and the reservoir head space causing the trapped liquid to be carried over into the reservoir. It is partly for this purpose that the pressure fluid is introduced into a can to be ñlled. 25 The illustrated preferred form or embodiment of the instant invention comprises in part a ver tically movable support or lifter pad I I (Fig. 1) for supporting the can a to be filled with liquid. The lifter pad is mounted on the upper end of 30 a vertical rod I2 which is raised and lowered by any suitable means. The rod is carried in a bearing I3 formed in a bracket Ill which extends laterally from a main frame I5. A can when positioned on the lifter pad II is 35 directly under and in vertical alignment with a ñlling head unit I6 (Fig. l). This head com prises a substantially cylindrical body I 'I (see also Fig. 5) having a rear extension I8 which is secured to one side- of a reservoir I9. The res ervoir is supported by the main frame I5 and is sealed off or closed by a cover plate 2I. The reservoir contains the liquid to be ñlled into the positioned can through the medium of the filling head unit. This liquid is held un der fluid or gas pressure introduced into the head space above the liquid in the reservoir in any suitable manner as through a pipe 22 (Figs. 1 and 4). This pressure minimizes the foaming of the liquid while it is in the reservoir. The positioned can is lifted by its lifter pad Il so as to bring its top ilanged edge into en gagement with the bottom of the filling head I6 as shown in Fig. 1. The top of the can is clamped against a sealing ring 23 of rubber or like resilient material which hermetically and temporarily seals off the can interior. The sealing ring surrounds the lower end of the head body I'I and is held in position by a sleeve 24. The upper end of the sleeve thread edly engages an annular shoulder 25 of the head body. At its lower end the sleeve is formed with 40 45 50 60 an internal annular shoulder 2S which engages against a tapered bottom or can engaging end of the ring 23. 65 While the can is thus held against the ñlling head certain actions attending the filling of the liquid into the can are effected and are controlled by a rotatable valve 32 (Fig. 1) which is carried in the head. The valve is tapered and is verti 70 cally disposed in the head body Il in a tapered seat 33 formed therein. The upper end of th-e valve extends above the head body and is con nected by a tongue and groove connection 34 to an enlarged lower end of a vertical Valve shaft 35. 2,109,489 This shaft is carried in a bearing 36 formed on a bracket 31-which is bolted to the side of the reser voir i9. The valve 32 is intermittently rotated in its seat 33 by an indexing device associated with the valve shaft 35. For this purpose the upper end of the shaft carries a star wheel 4I (Figs. l and 4) hav ing a plurality of equally spaced laterally ex tending iingers 42. These iingers are individual 10 ly engaged for turning the valve through its diiferent positions by corresponding actuating fingers 43 which are secured to a continuously rotating horizontal gear 44. The gear 44 is carried on a vertical shouldered l15 stud 45 which is threadedly Iengaged in the reser voir cover plate 2l. The gear is turned in a clockwise direction as viewed in Fig. 4 by a mesh ing pinion 46 which is pinned to a vertical drive shaft 41. At its lower end this shaft is carried in av'bearing 48 formed in the reservoir cover 2|. The shaft is rotated continuously in any suitable manner. In the first valve position where the vacuum is drawn on the can interior a segmental vertically 25 disposed shallow port 5! (Figs. 2 and 3) formed in a side of the valve, connects one end of a horizontal upper channel 52 with a parallel lower channel 53. The channel 52 (see also Figs. l and 5) is in communication with a short horizontal 30 passageway 54 disposed at right angles and con necting with a pipe 55 threadedly secured in the side of the body extension. This pipe leads to any suitable means for creating a vacuumgsuch as a pump, reservoir or the like. 35 The channel 53 connects with a passageway 56 which extends down through the head body I 1 and opens into the can interior. Thus when the valve is in this ñrst position air trapped in the can and in the filling head passageways exposed 40 to the atmosphere during the placing of the can in the head and liquid and foam retained in the vent passageways below the valve port 5I are all drawn out through the pipe 55. In the second position of the valve the carbon 45 dioxide or other ñuid is introduced under pressure into the vacuumized can. For this purpose a valve port 51 (Figs. 6 and 9) formed in the side of the valve and slightly below the port 5|, con nects the end of the channel 53 with one end of a 50 lower horizontal and parallel channel 58. The opposite end of this latter channel communicates with a short horizontal passageway 59 disposed at right angles and connects with a pipe 66 which is threadedly secured in the side of the body exten sion adjacent the vacuum pipe 55. 'I‘his pipe 6B is a supply pip-e from any suit able source of carbon dioxide or other fluid which is introduced under pressure into the can by way of the pipe, the passageway 59, channel 53, port The pressure 60 51, channel 53 and passageway 56. created in the can by the .fl-ow of fluid through these passageways and channels is preferably greater than the fluid pressure in the reservoir above the liquid, a difference of two pounds being usually suñicient in the case of beer. In the third valve position a shallow valve port 6l (Figs. 5, '7 and l0) connects the ends of parallel upper and lower vent channels 62, 63 formed in the valve body extension I8. This establishes di TO rect communication between the can interior and the space above the liquid in the reservoir i9. The channel 62 connects with a similar channel 64 formed in the side wall of the reservoir and this in turn connects with a vertical passageway 65 which at its top leads out into an opening 66, 3 form-ed in the reservoir Wall. This provides com munication with the interior of the reservoir. The channel 63 (Fig. 7) communicates with the upper end of a vent passageway 61 which opens out into the can interior. A grooved plug or trap 68 (see also Fig. 12) is located in the bottom end of the passageway 61 being formed with a plurality of surface grooves or flutes 69 which permit liquid, foam or gas to freely pass into the Vent passageway 61 from the 10 can during a ñlling operation but block return to the can of liquid or foam which may have passed the trap. The iiutes 59 are so small that capil lary attraction holds such liquid or foam in the vent passageway and prevents it dripping back 15 into the can. When communication is established between the can interior and the reservoir, as in the third valve position under considerati-cn, the carbon di oxide from the can, being under a greater ñuid 20 pressure than that in the reservoir above the liq uid, sweeps through the trap flutes 69 and con necting vent channels and valve ports into the reservoir head space. This action carries the trapped liquid or foam 25 back into the reservoir and delivers it on top of the liquid therein. Thus the venting channels are purged before ñlling liquid into the can and at the same time the can and reservoir head space fluids are brought into direct confluent 30 contact which results in a- direct pressure balance between the can and the reservoir. In this way the can is prepared for ñlling. For this filling operation the Valve 32 is turned to bring a port 1l (Figs. 1, 8 and 11) into register 35 with liquid conduits 12,13 located between can and reservoir. These conduits are formed in the head body extension I8, conduit 12 opening into the can and conduit 13 joining with a conduit 14 formed in the reservoir side wall adjacent its 40 bottom. This latter conduit is open to the liquid in the reservoir. The liquid ilows through the conduits and valve port by reason of the pressure of its hydrostatic head. As it passes from the open end of thecon 45 duit 'E2 and into the can it flo-ws against the side wall of the can and this together with the bal anced iiuid pressure in can and reservoir, causes the liquid to flow quietly and gently. During this passage of the liquid into the can the vent channels remain open and ñuid from the can is vented into the reservo-ir as it is displaced by the entering liquid. This is effected by a Valve port 11 which is identical with the port 6I and spaced horizontally from the latter and which was brought into register with the ends of the vent channels 62, 63 when the port 6| was shifted out of register during the last valve movement. 'This venting back causes the fluid as it passes from the can to take the place of a substantially 60 _equal Volume of the liquid as it is withdrawn from the reservoir. Thus the reservoir pressure is maintained substantially constant. When the can is completely ñlled with liquid and the liquid level in the ñlling head has reached its highest level the Valve 32 is turned into its iinal position (Fig. l) completing its cycle. This last valve movement cuts off communication between all the channels and conduits. AThereafter theV iilled can is removed from the iilling head by the lowering of its supporting lifter pad Il and may then be discharged therefrom in any suitable manner. It is thought that the invention and many of its attendant advantages will be understood from 75 4 2,109,489 the foregoing description, and it will -be apparent that various changes may be made in the form, construction and arrangement of the parts with out departing from the spirit and scope of the in vention or sacrificing all of its material advan tages, the form hereinbefore described being merely a preferred embodiment thereof. I claim: l. In a machine for filling liquids into cans, 10 the combination of a sealed reservoir containing a filling liquid which is maintained under pres sure of a gas, a filling head cooperating with said reservoir and adapted to receive a can to be liq uid filled, gassing means for introducing a gas 15 from a source separate from said reservoir into a said can while in said head, said latter mentioned gas being under a pressure greater than the gas pressure in said reservoir, means in said filling head for providing a connection between the gas 20 filled can and the gas space in said reservoir to balance the two pressures, said means being adapted for opening communication through said head for the reservoir liquid to flow gentle into 25 said balanced pressure can. 2. In a machine for filling liquids into cans the combination of a sealed reservoir containing a filling liquid which is maintained. under pres sure of a gas, a ñlling head cooperating with said reservoir and adapted to receive a can to be 30 liquid ñlled, means for vacuumizing a said can while in said head, gassing means for introducing a gas from a source separate from said reservoir into a said can while in said head and under a pressure greater than the gas pressure in said res 35 ervoir, a conduit in said filling head for provid ing a connection between the gas filled the gas space in said reservoir to balance pressures, and liquid ñlling means for communication through said head for 49 can and the two opening the res said gas connection between can and i‘eservoir so that gas from the can flows into the reservoir space as it is displaced by the liquid entering the can, 5. In -a machine for ñlling liquids into cans, 10 the combination of a sealed reservoir for con taining a filling liquid which is maintained un der pressure of a gas, a iilling head cooperating with said reservoir and adapted to receive a can to be liquid ñlled, gassing means for introducing 15 a gas from a source separate from said reservoir into a can while in said ñlling head, said latter mentioned gas being introduced under a pressure in excess of the gas pressure in said reservoir, conduits for establishing direct communication 20 through said ñlling head between said gas ñlled can and said reservoir to balance the can and reservoir pressures, and an additional conduit constituting liquid filling means for gently fill ing said can with liquid from said reservoir by way of said ñlling head while venting the can into said reservoir, and means in said filling head for trapping therein liquid and foam entering the venting and filling conduits. 6. In a machine for ñlling liquids into cans, the 30 combination of a sealed reservoir containing a filling liquid which is maintained under pres sure of a gas, -a filling head cooperating with said reservoir and adapted to receive a can to be liquid ñlled, means for vacuumizing a said can while in said head, gassing means for introduc ing from a source separate from said reservoir a gas into said vacuumized can, to create a pres sure in excess of the gas pressure in said resei‘ ervoir liquid to ilow gently into said balanced voir, a conduit in said ñlling head for providing 40 pressure can. a connection between the gas ñlled can and the gas space in said reservoir to balance the two pressures, and anA additional conduit constitut 3. In a machine for filling liquids into cans, the combination of a sealed reservoir for containing a gas charged filling liquid which is maintained 45 under pressure of a gas having the same charac teristics as the gas in the liquid, a ñlling head cooperating with said reservoir and adapted to re ceive a can to be liquid ñlled, gassing m'leans for introducing into a received can from a source 50 separate from said reservoir, a gas having the same characteristics as the gas in the liquid and under a pressure in excess of the gas pressure in said reservoir, a conduit for establishing direct communication through said filling head between 55 said gas ñlled can and said reservoir to balance the can and reservoir pressures, and a second conduit constituting liquid ñlling means for gen tly filling said can with liquid from said reservoir by Way of said ñlling head. 4. In a machine for filling liquids.l into cans, the combination of a sealed reservoir containing a filling liquid which is maintained under pres sure of a gas, a filling head cooperating with said reservoir .and adapted to receive -a can to 65 be liquid filled, gassing means for introducing a gas into a said can from a source separate from said reservoir to create in said can a pressure in excess of the gas pressure in said reservoir, con 70 previous ñll and to also balance the two pres sures, and liquid filling conduits for opening communication through said head for the res ervoir liquid to flow gently into said balanced pressure can while simultaneously maintaining 5 duits in said filling head for permitting gas from said can to sweep from the gas iilled can to the .gas space in- said reservoir to purge said con duits of any liquid and foam remaining from a ing liquid ñlling means for opening communica tion through said head for the res-ervoir liquid to 45 flow gently into said balanced pressure can while simultaneously maintaining said gas connection between can and reservoir so that gas from the can flows into the reservoir space as it is dis placed by the liquid entering the can, which ac tion restores the gas pressure in the said reser voir space to prevent pressure diminution by reason of the removal of the liquid from the 50 reservoir. 7. In a machine for filling beer into cans, the combination of a sealed reservoir containing beer which is maintained under pressure of carbon dioxide gas, a filling head cooperating with said reservoir and adapted to receive a can to be iilled, gassing means for introducing carbon di 60 oxide gas from a source separate from said res ervoir into ra said can while in said head, said latter mentioned gas being introduced under a pressure greater than the gas pressure in said reservoir, a conduit in said ñlling head for pro 65 viding >a connection between the can and the gas space in said reservoir to balance the two pressures, and an »additional conduit constitut ing liquid ñlling means for opening communi cation through said head for the beer to flow 70 gently into said balancedpressure can from said reservoir. JOHN DANIEL LE FRANK.