US 2526949 A
Abstract available in
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Description (OCR text may contain errors)
Oct. 24, 1950 R. R. HULL 2,526,949
LIQUID AGITATING AND DISPENSING APPARATUS Filed Jan. 15, 194e 4 sheets-sheet 1 Oct. 24, 1950 R. R. HULL 2,526,949
LIQUID AGITATING AND DISPENSINGl APPARATUS Filed Jan. 15, 1946 4 Sheets-Sheet 2 IN VEN TOR.
Oct. 24, 1950 R. R. HULL 2,526,949
LIQUID AGITATING AND DISPENSING APPARATUS Filed.Jan. l5, 1946 4 Sheets-Sheet 5 Oct. 24, 1950 R, R, HULL 2,526,949
LIQUID AGITATING AND DlsPENsING APPARATUS Filed Jan. 15, 194e 4 sheets-sheet 4.
s A 88 los |20 l l2! IN VEN TOR.
Patented Oct. 24, 1950 LIQUID AGITATIN G ANDDISPENSING APPARATUS Y,
Robert R. Hull, Covina, Calif., assigner, by mesne assignments, to California Fruit Growers Exchange, Los Angeles, Calif., a corporation oi' California Application January 15, 1946, Serial N0. 641,267
This invention relates to liquid dispensing apparatus; and it relates more particularly to apparatus for dispensing a beverage liquid, such 'as "a fruit or vegetable juice, characterized by the provision of power driven means capable of functioning both to agitate a supply of said beverage liquid tov a desired extent, more especially continuously, and also, upon appropriate change of driving connection to the source of power, to remove a measured quantity of liquid from said supply into dispensing position.
In dispensing certain kinds of beverage liquids by measuring out and delivering successive portions from a body thereof contained in the'supply reservoir, it is desirable in some cases to main- -tain the body of liquid in such supply reservoir tive, in conjunction with refrigeration, to maintain certain juices, notably citrus 'fruit juice, in good potable condition much longerthan when refrigeration alone is relied upon. Whether this is due to the aeration resulting from such agitation, or to some other cause, it is an established fact that if a refrigerated body of orange juiceffo'r example, vis vmaintained properly agitated, the juice will keep sometimes as much as a week or ten days longer than it'will when left atrest. .r
An important'object of the presentinvention 'is to providefa relatively simple apparatus especially adapted for dispensing beverage liquids of the indicated type, which includes means dependably effective in its operation to maintain a supply body of such liquid adequately agitated and, upon suitable modification of its agitating action, to deliver successive measured -portions from said body of liquid to a place of discharge.
A further important object of the invention is to provide dispensing apparatus of the general lcharacter stated, in which contact of bearings carrying moving parts` with the beverage liquid is eliminated or reduced 'Y to a minimum, and which can be kept in sanitary vcondition and easily recharged with a fresh supply of the vbeverage liquid whenever necessary.
With these and other objects in view, which will become apparent as thedescription proceeds, the invention comprises the. novel features 19 Claims. (Cl. 222-358) of construction and the combinationsv lthereof which Will rst be described in connection'rrwith a practical lform of apparatus constituting an illustrative embodiment of the inventive principles involved, and will then be morefparticularly pointed out in the appended claimsg" Dispensing apparatus constructed in accordancev with the principles of the invention em'- ploys one and the same means operable both to perform the function of agitating the body of beverage liquid contained in the supplyreservoir of the apparatusgand and also, upon suitable supplemental or modied actuation which may or may not be coin-controlled, to convey from said reservoira measured vquantity of said liquid for dispensing delivery to a point outside the reservoir. Most desirably said means takes the form of a dipper-like device having a hollow stem so mounted for oscillatory movement',*and so connected to appropriate driving provision, that the dipper, when'the apparatus is'no't'dispensing, depends intol the supply reservoir or tank andv is swung back and forth close to the bottom thereof, most desirably through a predetermined and positively controlled agitating' arc of swing, either continuously or to such "cire tent intermittently as may be necessary to ensure agitation of the body of beverage liquid in the desired degree. When a measured portion of liquid is to be dispensed, the action of said driving provision is modied in any suitable manner to cause the apparatus lautomatically to go through a dispensing cycle, whereinrthe dipper is caused to swing upwardly beyondits normally limiting position at one end of'its'f'aeitating arc to an elevation such that the measured portion of liquid carried up with it drains from the dipper into and through its hollow stem for delivery outside the reservoir; the dipper being thereupon swung back into the reservoir and continuing to operate in its normal agitating phase until again actuated to go through another dispensing cycle. f
Other novel features Vand advantages of the invention will be apparent from the"`detailed description hereinafter of one typical practical embodiment of the invention shown'in the'afccompanying drawings, wherein Y Y' e Fig. 1 is a iront elevation of the upper portion of the complete apparatus unit, the ap paratus cabinet or housing being shortened vertically and partly broken awayv to show Daft/S immediately behind the same, and the dipper beine indicated in its highest or dispensing Position; i 1 r Fig. 2 is a top plan of the unit shown in Fig. l, with the cabinet cover and beverage tank cover removed;
Fig. 3 is an end elevation, partly in section, viewing the apparatus of Fig. 1 from the right and with the cabinet partly broken away, but with the dipper swung down into its lowest position;
Fig. 4 is a plan, on an enlarged scale, of the. f
power and variable transmission unit forV operating the agitating and measuringA dipperi device, looking in the direction of the arrows 4--4 inFig. 1;
Fig. 5 is a front end elevationcorresponding. to Fig. 4, but showing certain'parts` in slightly later operating phase;
Fig. 6 is a front elevation of the gear constituting the driven member of a clutch device included in the transmission unit;
Fig. '7 is a rear elevation of the rotary cam disk for actuating the-clutch-shifting mechanism;
Fig. 8 is an elevation of part, of the clutchshifting mechanism, showing the mounting of the cam follower in the clutch-actuating frame or crosshead;
Fig. 9 is a side elevation, partly in central longitudinal section, showing on an enlarged scale further details of. how the rotary mounting disk and driving sprocket are assembled and supported for rotation;
Figs. 10 and 11 are, respectively, a rear elevation and a side ofV said mounting disk showing a portion of the dipper-mounting means secured thereto;
Fig. 12 is a detail perspective showing the cooperating portionof said dipper-mounting means,l with the dipper stem secured thereto.
In the beverage dispensing machineillustrated in the drawings, the novel combination of dispensing parts and operating mechanism with whichy the present invention is primarily concerned is housed as a unit within a cabinet indicated generally at 20. This unit, with its cabinet, is in turn mounted, at a level convenient for beverage dispensing, upon a supporting framework base 2l housed within a cabinet 22. As shown in Fig. 1 more particularly, cabinets 2U and 22- may desirably be so designed and proportioned that they appear, externally, to constitute sections of a single cabinet or housing within which are enclosed not only the main dispensing unit above mentioned, but also any necessary accessories such, for example, as the motor, compressor and condenser of a conventional type of refrigerating unit, indicated. generally at 23, located in the base of the lower section of the combined cabinet. The space within the upper section 2D of Vthe combined cabinet or housing, is divided into two unequal portions, front and rear, by a vertically disposed fianged plate 24 which extends the full height of the chamber parallel tothe front and rear walls of the cabinet between the opposite side or end walls thereof, being secured to said end walls and to the cabinet bottom in any suitable manner, as by welding. This vertical plate is positioned relatively close to the front wall of the cabinet. Besides thus serving as a partition wall, said plate 24 provides means on which to mount certain apparatus parts and operating mechanism, as will appear hereinafter. For a purpose that will also presently appear, the upper part of the upper cabinet section extends forward to provide an overhanging portion 26a. The cabinet has a double-walled cover 25, hinged` as 4 indicated at 26 along the upper edge of its rear wall 21.
Within the much larger space to the rear of mounting plate 24 is the cooling or refrigerating compartment whose side and bottom walls 28 are covered. with a layer of heat-insulating material 29, with which the space between the double walls of cover is also packed. Supported on or adjacent the bottom of the cooling compartment is sealed refrigeration pad 30 containing refrigerant expansion coils (not shown) connected by supply and return pipes 3|, 32, to the aforesaid refrigeration unit in the lower cabinet 22` Nesting within the cooling compartment is the beverageY liquid supply tank 33, supported by its outwardly projecting peripheral rim 34 upon horizontal supporting ledges 35 provided on the inner surface of the front and back Walls of the cooling compartment a substantial distance below the top of the cabinet. The supply tank is thus supported with its'walls and bottom spaced away from the walls and bottom of the cooling compartment. The supply tank is provided with a removable unitary cover comprising a flat main portion 36 and a portion 31 at the front which extends upwardly to provide a housed space within which the dipper device may swing upwardly into dispensing position, as will appear more fully hereinafter. The cover unit 36-31 has a depending peripheral flange 38 fitting snugly within the supply tank rim. The supply tank is provided interiorly with hand grips 39 whereby, after the hinged cabinetV cover 25 has been swung back and cover unit 36--31 removed through the open top of the cooling compartment, the supply tank may then also be lifted out. The front and rear walls of the supply tank, as well as one side or end wall', are plane; while the opposite side wall 40 and that portion 4| of the bottom immediately adjacent the front wall are most desirably cylindrically contoured. Saidportion 4l is therefore depressed, forming a dipper trough or well vertically below the axis and in the plane of dipper swing, and lower than the fiat portion 42 of the tank bottom to the rear, which is sloped gently forward toward the well to cause residual liquid to drain thereinto. That part of the cooling compartment bottom which underlies curved end wall 4Q of the supply tank is sloped to conform roughly therewith, as indicated at 40a.
A dipper device, comprising dipper 43 andv its unitary hollow stem 44 rigid therewith, depends into supply tank 33, at a location closely adjacent the front wall thereof, from supporting means permittingy limited rotational or swinging movement of the dipper device about a horizontal axis perpendicular to the mounting plate 24. The arrangement is such that the dipper device can be swung back and forth to stir the contents of the juice tank, and can also be swung upwardly to elevate said dipper high enough to cause liquid contained therein to flow through its hollow stem 44 and outwardly through the constantly substantially horizontal portion 44a thereof to a convenient exterior point of dispensing delivery. At its delivery end, the hollow dipper stem is provided'with an angular discharge spout 44h removably secured thereto as by the bayonet pin and slot connection shown at 44e. Provision is also made for maintaining adequate thermal insulation of the beverage supply tank at this locality despite the necessary aperturing of its front wall to permit passage of the dipper stem therethrough at some distance from the horizontal axis aforesaid. One practical form which such arrangement may take, as well as typical means for producing the stated swinging m'ovement of the dipper device in the manner and to the extent desired, are shown in the drawings 'and will now be described in detail.
In the upper, overhanging portion a of the cabinet space in front of plate 24, a tube providing a sleeve-bearing support is so mounted that its axis coincides with the horizontal axis,
- perpendicular to plate 24, about which the dipper device is to have rotational movement. Rigidly secured to said tube 45 adjacent its opposite ends, as by welding, are mounting fins or iianges 45a, so spaced apart as to fit closely between and "abut the adjacent faces of bracket 46 secured to and offset from mounting plate 24, and the lower of two front tie strips 41 at the front of the cabinet overhang 20a, when the tube 45 is seated in aligned recesses with which the upper edges of these members are respectively provided. Bracket 46 and tie strips 41, together with vertical transverse flanged bracing plates 48 extending between said strips and plate 24 and secured to both, bracket 46 also being secured to said plates as well as to plate 24, cooperate to provide a stiiT supporting framework for holding said bearing support tube 45 rigidly in proper position. The respective tube flanges are rmly secured to bracket 46 and lower tie strip 41 by machine screws 45D passing through apertures 45e in the fins, most desirably elongated to form slots, and cooperating tapped holes in the bracket and tie strip. This arrangement enables any necessary ne adjustment of the alignment of bearing support tube 45.
Press-fitted into bearing support 45 is sleeve bearing 48a, within which turns shaft 49 carrying a sprocket 50, whose hub 5| isv fixed thereto as by 'set screw 52, and one face of which is recessed as indicated at 53 to iit snugly over the end of the sleeve'bearing. This arrangement, to-
`gether with retaining flange 54 secured to the opposite end of the shaft by machine screw 55 which is accessible for adjustment or disassemblingY upon removal of closure plug 56 of the bearing support tube, prevents longitudinal movement of the shaft within said bearing:v On the opposite face of the sprocket hub, which is flush with the adjacent end of shaft 49, is mounted for coaxial rotation therewith, within peripherally sealed circular opening 51, which extends through mounting plate or partition 24 and also through rthe front wall of refrigerating compartment and the interposed heat-insulating material 29, a circular disk 58 which, in turn, carries the dipper device aforesaid. This disk, which is most desirably composed of a synthetic plastic or other Vadequately strong and tough heat-insulating mavsaid disk, as indicated at 33a and 33h. N otch or recess 6|, which extends radially inward from the periphery of disk 58 a distance somewhat v,greater than rthe external diameter of the hori- :z'ontal portion 44a of the dipper stem, and the concave semicylindrical base Wall Alila Aof which hasa radius of curvature slightly greater than half' said diameter, is adapted to receive said portion 44a of the dipper stem'. Seated in rectangular recess 62 on the rear face of said disk and secured thereto by machine screws 63 which extend through the disk from its front face and have their heads countersunk therein, is the base 64 of a hanger hook which includes a rearwardly projecting outer portion 65 that is rigid with said base and is broadened to provide circularly curved lateral retaining flanges 66, 66a, which are concentric With the aforesaid cylindrical base Wall 6|a, and which overhang and are spaced from the disk surface as shown (Figs. 10 and 11).
Cooperating with this hanger hook is a dipper bracket and claw member indicated generally at 61 (Fig. 12), which has a flat catch portion 68 slidably seating against portion 65 of the hanger hook, with depending, inwardly directed circularly arcuate lateral flanges B9, 69a, which slidably fit around and under the cooperating arcuate flanges 66, 66a, of the hanger hook. Spot-welded or otherwise rigidly secured to said member 68 is plate 1U which has its end portions bentat right angles to provide two rearwardly extending flat bracket arms 1|, 12. The hollow stem of the swingable dipper device is attached to the outer ends of said bracket arms, said ends being arcuately formed to fit closely the contouring of the dipper stem at the points 13, 14, where they respectively engage the stem and are `firmly united therewith as by welding; the claw anges 69, 69a being coaxial with the forwardly extending, substantially horizontal portion 44a of the dipper stem, which is adapted to seat loosely in the s-emicylindrical inner or base portion of recess or notch 6 I. The parts are so proportioned and disposed relative to one another that, when the parts are properly assembled with portion 44a of the dipper stem so seated, its longitudinal axis coincides with that of said cylindrical base portion; and said claw anges 69, 69a, are interengaged with flanges 66, 66a, of the hanger hook.
In order thus properly to assemble the dipper device with the rotary mounting and insulating disk 58, the horizontal portion 44a, with the deendwise through notch or recess 6| in the disk periphery until portion 69 of the bracket and claw `member carried by the dipper stem is closed to the rear face of said disk. Then, with portion 44a of the dipper stem seated in the base of recess 6|, and lin such angular position that, viewing the parts as seen in Fig. 10, the circularly curved claw ilanges 69, 66a, are somewhat above`hook flanges |35, 66a, and are circularly aligned therewith in coplanar relation, the desired sliding interengagement is eiTected by turning the dipper and mounting claw assemblage counterclockwise about the axis of said portion 44a of the dipper stem, Suitable stop means, such as pin 15, arrests this turning movement when the claw member fully overlies the supporting hook member. At the same time, reverse or clockwise turning movement of said assemblage is prevented by means of a latch device comprising curved spring clip 16 secured at one end 1l to claw flange 69, as by welding, and provided at its free opposite end with a latch pin 18 which works through a hole in said flange and is pressed radially inward by the action yof the spring clip. Just as the claw member isy about to strike and be arrested by stop pin 15, the latch pin registers with and is forced into `a recess-19 provided in the adjacent'face ually operable without deposit of a coin.
ofthe cooperatingnange' of the hook member. thus holding the assembled parts rmly against accidental disengagement. Yet, when it is desired to remove the dipper device, the latch pin is readily moved out of recess 19 by lifting that end of the spring clip; whereupon turning the dipper and mounting claw assemblage clockwise disengages it from the mounting hook and permits removal of the dipper device.
It will be seen that the described arrangement provides a. firm and` rigid mounting of the dipper device on the disk 58, which at the same time can be readily disassembled, when desired, for cleaning or other purposes. Moreover, the offcenter mounting of the clipper device on the disk in the manner described entirely avoids the disadvantages and mechanical dfculties that would be involved in having the hollow dipper'stem pass through the disk axially.
Suitable driving means are provided for continuously oscillating the agitating and dispensing clipper device, mounted as described, at a predetermined rate and through a predetermined angular distance, usually an equal distance (e. g. each side of the vertical or central dipper position; whereby to maintain the beverage liquid, e. g. orange juice, properly agitated. Associated with such driving means is provision whereby, while normally operating in this manner, the driving connections may be altered, either manually or by coin-actuated mechanism, to interrupt the normal agitating action of the dipper and cause the dipper automatically to go through a dispensing or vending cycle wherein it is elevated to dispensing position as shown in dotted lines in Fig. l, and then returned to its lowered position for resumption of its oscillatory agitating movement. 'I his latter then continues indefinitely untl once more interrupted by initiation of another dispensing cycle. While such driving means may take widely differing specific forms within the scope of the invention, the arrangement here illustrated' and now to be described works well and has certain advantages of considerable importance from a practical standpoint.
In the specific form here illustrated by way of example, the invention is embodied in apparatus more particularly suitable for use in locations where, as at a soda fountain, an operator is in attendance to serve purchasers with measured portions of the beverage dispensed by the apparatus. Therefore the means here shown for changing the functioning of the dipper device from its normal operation of stirring the beverage to that of dispensing a measured portion of it are man- In general, such means comprises clutch mechanism shiftable to connect a normally idle dispensing or vending cycle drive shaft temporarily to a source of power which also actuates an agitating drive shaft, such connection being maintained until a predetermined cycle of dispensing movements has been completed, whereupon the connection is automatically broken.
Located within cabinet 20, therefore, in the space below the sloped portion 40a of the brine tank bottom, is an electric motor 80 of the gear head type, connected by flexible coupling 8| to main driving shaft 82 journaled in suitable bearings on the frame of the transmission gear box or case 83. Shaft 82 drives similarly journaled agitating transmission shaft 84 continuously through meshing gears 85, 86, fast with the respective shafts. In the arrangement here shown,
drive shaft 82 revolves counter-clockwise, as
8 viewed in Fig. 5. Shaft 84 extends through the front wall of the gear case, and to its, projecting end is xed crank disk 81 having crank pin 88. Gear 89, loose on shaft 84 and provided with a hole or holes in its web, constitutes the driven member of a pin clutch, of which the two-part driving member consists of driving collar 9| fixed to said shaft as by set screw 92, and pin-carrying collar 93 longitudinally shiftable on said shaft to move clutch pin 94, which is rigidly mounted on said collar 93, through passage 95 in collar 9| t0- ward or away from gear 89, and the holes 90 therein` any of which said piny is adapted to enter for the purpose of driving said gear. Spring 96, coiled around-shaft 84 and compressed between xed collar9| and longitudinally movable collar 93,
tends to move the latter away from collar 9| into a limiting position such that the clutch pin 94 is just disengaged from gear 89. This limiting position, which is constantly maintained except during a dispensing cycle, is determined by abutment of stop ring 9'1, seated in a circumferential groove at the free end of a shorter pin 98 secured to collar 93, with shoulder 99 in passage |00 through collar 9| in which this pin works.
Also journaled in the gear case frame and projecting through the front wall of said case is dispensing or vending cycle shaft |0|, carrying fast therewith gear |02 which meshes with gear 89 and is desirably of greater diameter.v Also fast with shaft |0| is a circular disk |03 having a rearwardly extending peripheral flange |04, whose rear face is formed as a cam track |04a against which bears roller cam-follower |05 trunnioned in and intermediate the ends of a double cross bar or frame |01, as indicated at |05; the assemblage constituting a clutch-shifting lever device fulcrumed on the cam ange. This lever device is connected at its ends to shafts 84 and |0| in such manner as not to interfere with rotation of said shafts, and as to be movable longitudinally along the same. In the particular construction here shown, one end of said lever device is pivotally secured at |08 to `a squared collar |09 which is loose and slidable on shaft |0|. Its opposite end is similarly pivoted at ||0 to squared collar which is loose and slidable on shaft 84. Coiled compression spring ||2 on shaft |0| is confined between hub ||3 of gear |02 and said collar |09, and at all times acts upon the lever device aforesaid to press collar |09 against the hub |03a of cam disk |03, except as hereinafter noted. Furthermore, with the clutch fully engaged as shown in Fig. 4, which depicts the mechanism as being in dispensing phase and as having nearly completed a dispensing cycle, the cam follower |05 is riding on the highest part ||5 of the cam track |04a. Also, because spring ||2 is stronger or stiffer than clutch-disengaging spring 96, the pressure of collar I against collar 93 holds the clutch engaged, against the opposing thrust of spring 96. Upon slight further rotation of the cam, counterclockwise as seen in Fig. 5, the dispensing cycle is completed and follower |05 is pressed into the relatively deep depression H4 in the cam track, causing immediate disengagement of the clutch and cessation of all movement on the part of shaft |0| and the cam disk fixed thereto. Operation in agitating phase is thus restored and continues until another dispensing cycle is started.
In order to start another dispensing cycle, it is necessary to rotate the cam disk farther in the same direction through a sufficient angle to cause follower I 05 to ride up out ofdepression I I4 on to the high part H5 of the cam track, thus elevating the fulcrum of the clutch-shifting frame |'I. This forces rearwardly the collar |09 and that end of the frame which is pivoted thereto, thereby increasing the compression of spring H2. If at this instant the clutch pin 94 and one of the clutch holes 90 in gear 09 happen to be in alignment, the opposite end of the frame, with collar I|I pivoted thereto, will be simultaneouslyl moved rearwardly a -distance suicient to cause engagement of the clutch; the thrust of the stronger spring H2 overbalancing that of the weaker spring 96 asaforesaid. However, if the rotating composite clutch member 93-95 happens, at the instant the` follower rides up out of the depression H4, not to be in such angular position that the clutch pin 91|`V and one of clutch holes 90 in the then stationary. gear 89 are properly aligned, the clutch pin;is in that event simply thrust `into abutment withthe web of gear 89 and bears thereon until, upon suicient further rotation of the clutch member 93-95, such proper alignmentoccurs and the clutch parts engage. In the specific construction here shown, where the gear 89 ris provided with a plurality-of holesinto any of which the clutch pin may enter, the delay in clutch engagement :clue to initial non-alignment of pin and hole is only momentary. During-such delay, collar |09 on shaft |0| is lifted somewhatout of `contact with the hub of cam disk |03 against the thrust of spring I I2, but upon clutch engagement is again immediately seated on the hub by said thrust. 'Collars |09 and II I are suiliciently loose on their respective shafts to permit the described movements to takefplace.' y
The clutch being engaged, dispensing shaft I0 I is driven, together with dispensing crank H6v xedly secured to the forward end ofsaid shaft which projects through the front wall Yof thei transmission case. When thedispensing shaft andthe camidisk xed thereto' havecoxnpleted substantially one'revolution, follower |05,y drops back into recess `I I4 in the cam track, causingg disengagement of the clutch and restoration oi?- the parts to the agitating phase-position. i
Suitable means are provided-for turning cam disk |03 into proper starting position, wherein` follower |05 is elevated to causelengagement of the described clutch mechanismV and thus initiate the dispensing cycle. In the arrangement here shown, .a tripping device (for thispurpose comprises a bar Hl which is'xedly Ysecured near one end topivot shaft H8 jo'urnaledv inthe transmission case frame and extending throughl the front wall of said case and the front wall of the cabinet; an operating lever handle IISXedto such externally projecting extension; and a pendant latch hook or catch |20, pivoted to said,
bar near its opposite end to swing freely there# from. When dispensing shaft |0I randy the parts associatedftherewith are at rest, said hook lis maintained by gravity in latching'con'tact with a detent', such as peg |2I, carried onthe--front face of cam disk |03.vr For-the sake of -convenience' in explanation, the hook and detent are shown in Fig. 5 as being in thisposition, in which the cam disk has turned counterclockwise slight- -ly'.farth`erth'anv in the position shown'in Fig.- l-, so that-follower |05` rests in depression y|`|4 and the clutch is disengaged.
`When the parts are thus positioned, downward pressure on .the operating lever handle H9 causes the hook to be lifted'to engage peg I2| and ad- Vance the'cam disk counterclockwise through small angle just suiicient to elevate follower |05 and engage the clutch to initiate the dispensing cycle, as above described. Upward movement of tripping or latch bar v| I'I is limited by suitable stop means to an amount just suicient to accomplish this result. Upon release of handle H9, thelatch bar is returned to its original position by gravity, this return movement being expedited by the downward pull of a coil spring |22, if desired, as here-shown.
rvWhen, due to yinitial non-alignment of the clutch pin and a receiving hole in gear 89, completion of clutch engagementismomentarily delayed,:pushing down the operating handle H9 may besaid to fcock the dispensing cycle mechanism;so that when'the proper alignment does occur, the somewhat increased compression of spring; II2 by reason of the temporary lifting of collar I09'from itsnormal seat against hub |03a of the cam disk, enables that spring to complete more expeditiously its slightly delayed action in perfecting' clutch engagement.
lIn order that, under the conditionsA just described,'the bearing of the clutch pin against the gear webmay not vcause more or less premature -drifting movement of gear 89 and the train ofdispensing mechanism arranged to be driven thereby, :prior to positive driving engagement of the clutch parts; itis desirable to provide a sha1- low recess or notch I22,ain the cam track, into which the :follower |05 drops'immediately after riding out of the deep recess H4; Recess |22a is soshallo'w thatthe elevation of followerl |05 is still-Campleto accomplish 4thedesired engaging movement of,v the clutchl parts for rinitiating the dispensing-cycle; but it is deep enough to provide a detent effective to prevent the aforesaid driftingfI movement'fan'd ythereby ensure positive` start cfzsaid cycle at the samer-definitely established point in 'each instance. Since thecam track is ofuniform height except for the said depressions or recesses H4L and |22a., positive clutch engagement is maintained throughout the further counterclockwise movement of the cam disk through's'omewhat less than 360, which is terminated by dropping'of the follower |05 into deep recess H4 andjconsequent disengagement of the driving clutch mechanism.
Just before this return of the dispensing mechanism parts to their normal or inactive position is completed, peg I2I strikes the tail |23' of the latch hook, swings the hook backward about its pivot, and rides over 'its nose |24. The hook then swings back freely into latching position as the cam disk comes to rest, in which position the hookis ready to 4engagethe peg` and re-set the cam for. Aanother vdispensing cycle, vwhen handle I 9 is againdepressed. L @Referring now :to Figs. 1-3 more particularly,
a length of roller. chain |25 trained about sprocket 50 has one end attachedl to crank pin 88'of crank 8l on the continuously'driven agitator shaft 84, and the other end to acoiled'spring |26 which, in turn,V is anchored as at |2'I to plate 24'or other'convenient stationary part of 'the apparatus. At some suitable point |28, intermediate the sprocket and crank -pin 88, another length |29 of roller chain has one end fastened vto chain |25; while its'other endV is secured tov crank pin I 30 of crank I I6 on the normally 'idle dispensing shaft |0|. The respective-throws of said cranks 81 and vH6, as wellfas the respective lengths of chains '|25 and |29; are all'so proportioned and correlated to each other, and the point of attachment atea-949 of chain '|29 to chain 25 is 'so chosen, that whatever 'may be the angular position of either crank, spring I 26 is always under greater or less tension, tending to turn sprocket 50 clockwise as viewed in Fig. 1. Hence the spring at all times tends to draw the chain over sprocket 50 and thereby to produce angular movement of the dipper assembly in a direction opposite to that which can be produced periodically by the outward throw of either ofthe two cranks. Thus, at all times during operation of the machine in the normal agi'tating (non-dispensing) phase or cycle, each outward throw of crank 8'! on the continuously revolving agitator shaft 84 (i.e. in a direction away from sprocket 50) causes sprocket 5D to turn counterclockwise against the pull of spring |26 until, ait the outer dead-center position, corresponding to completion of the outward throw of the crank, the dipper has been swung to the positioiconstituting the predetermined end of its agi'tating swing in that direction (toward the right lin this instance). Its position at the end of the agitating swing may be any desired angularfdstance (e. g. `beyond the mean or central positioniof the dipper in its agitating swing. Infsaid mean position, that part of the dipper most remote from the axis of swing, i. e. Athe common horizontal rotational axis of sprocket 50 and disk -58, lies in the vertical plane passing through said axis. ln the 'present instance such part .o'iy thefdipper is its 'scooping lip |3|, the radial distance 'ofY which from the'axis Aof swing i's` only slightly less than that of the coaxial concave' 'cylindrical bottom surfaces 40, 4|., of the juice supply `tank 33. 'Following completion of the" outward throw of crank V81, its succeeding inward' throw in .rotating through another 180, permits,":s'pringV |25 to turn' sprocket 50 clockwise until the crank has returned to itsinner dead-center point, `at. which point the dipper has been swung back through its mean position to its Apredetermined limit A*of swing (e. g. 30) therebeyond. Byfthe continuous revolution of shaft 84, this alternating to-and-fro vagitating movement of the dippernis made to occur at any desired rate which depends, ofcourse, upon the speed at which shaft Mis driven. A speed of 18 R. P.l M. for shaft 84 istypicallyxgood practice. The direction of rotation of this shaft as viewed in Figs. 1 and 5, is assumed Ito be clockwise in this illustrative embodiment of the invention, as already noted. The sp'eed at which shaft |'0I is rotated should be relatively slower, in order to avoid loss of any ofthe measured amount of liquid from the dipper as it ,is being elevated in the dispensing cycle, and to 'ensure complete emptying of the dipper through its hollow stem during the -period when the dipperris Vata levelhigher than its center of swing. In the present example, the diameter olfffgea-r IIJ2fis twice that of gear 89, so that shaft iflfgrevolves 'one-half as fast as shaft 84. y
. ,During operation `of the machine in strictly agita-ting phaseor cycle, the dispensing'shaft I0| remains at rest, with its crank I6 in such angullar position that connection of its crank pin |30 tn chain |25 'by chain |29 does not interfere with orf-otherwise affect in any way the above described reciprocating movement of chain |25 produced by the Yconjoint action of crank 81 and spring- 1|,28.I`his requirement is met byA so setting crank |15 on shaft |0| that, when follower |05 rests in depression I4 ci the cam track, crank pin |30 is :closest to sprocket 50; which may be called the normal or inactive position of the dispensing crank. Obviously, the effective length ofjch-ain |32 or vother resilient member may be lconnected to an intermediate point of chain |29 and anchored to spring |26 as indicated at |133, to hold the -slack of chain |29 clear of chain |25.
The throw of crank )IIfB is greater 'than 'that of crank '811 by an amount such that, when the mechanism perfor-ms a `dispensing cycle, disL pensing crank |'6 will take over actuation -of the clipper device at ya suitable point in the normal or fagitating swing of the dipper; and, from'that point on, will cause the clipper eventually to travel beyond one -lim'it of its normal 0r =agitating 'swing and rise, Vat progressively diminishing speed, to a predetermined maximum height -above its axis of swing and discharge its measured content of liquid through its hollow stem. In the specific illustrative embodiment of the invention herein described by way of example, the dipper attains a maximum elevation, at `the extreme'foutward throw of the dispensing crank, such that it then n I has an effective-liquid discharge angle or slope in Vthe neighborhood of 20 degrees vto the horizontal. Accordingly the dipper will be in -liquiddischarging position, i. e. higher than its a'xis of swing, long enough to ensure adequately complete emptying and drainage of the measured juice 'from Athe dipp'e'r to the point of Y*ultimate delivery; especially 'so b'ec'ause lof 'the virtual vdwell characterizing its simple harmonic motion while it is higher than its axis of swing.
It will be notedthat, in'the construction illustrated, the mounting plate 2'4 is -apertured at |34 to vaccommodate the forward vend of th'e gear box or case 83, thefou'ter frontwall of which is flush'wi'th 'said mounting plate'and is suitably held in position as by mounting straps |35 'fastened both to the plate and-to the frame 'of the gear case lby cap screws |3521. `At the rear, the gear box iis 'sirx'iilarly secured by cap screws |36 to verticalv supporting plate |131 which has an integral base flange anchored to the floor of the cabinet asindicated at |38.
The front upanel of the cabinet is removable, by turning'out `screws |39 which hold `it in place, for inspection and adjustment of the operating parts housed in thefo'rward compartment between said panel, and mounting plate 24. An opening closed by removable cover Y|40 is provided in the end wall adjacentl the motor and gear box for ready access to these parts. It is to `be understood thatsuitable means (not shown) may be provided for Vpreventing unauthorized access to the interior of the cabinet in any manner. whether by removal of the removable cabinet portions mentioned, or otherwise.
The operation of the apparatus here shown will-be readily understood from the foregoing description, but will be briefly summarized, as follows: Assuming the Vsupply tank 33 to be lled with orange juice, Yfor example, and themotor 80, as well as `the 'motor -of the refrigerating unit 23, to 1`be-connectedto 'a suitable electric .-power line, and further assuming the 4transmission mechanism to be in the position illustrated in Fig. 4, the dispensing cycle is nearly concluded and follower |05 is about to drop into cam de-y I3v pression ||4 and render shaft |0| idle. The continuous rotation of shaft 84 thereupon causes dipper 43, which is in its depending or lowered position, to resume its back-and-forth swinging movement through a limited angular distance on either side of the vertical, whereby to maintain the juice in the supply tank continuously agitated. Crank pin |30 being at the extreme inward end of its throw, that is, the minimum possible distance from sprocket 50, chain |29 is now loose, while the entire length of chain |25 is constantly taut and therefore reciprocated by rotation of crank 81 against the resisting tension of spring |26. When it is desired to dispense a measured portion of the juice, lever handle 9 is depressed to shift cam |03 into starting position, thereby causing engagement of the transmission clutch and rotation of shaft IDI and cam disk |03 through one dispensing cycle as previously described. Due to the relative proportioning of the respective throws of cranks 6 and 81, and of the lengths of the respective chain sections described, the continuous rotation of agitatingr crank 81 ceases to have any effect upon or control over the movements of the dipper shortly after commencement of the dispensing cycle, because the angular movement of crank ||6 thereupon causes chain section |29, and that section of chain |25 between point |23 and the spring |26, to be tensioned directly by crank H6, the reg maining loose section of chain |25 remaining idle during the dispensing cycle despite the uninterrupted rotation of crank 81. The oscillatory movement ofthe dipper is thus discontinued at a predetermined angular position of crank H6. Bythe further action of crank H6, the dipper isvfirst raised to its position of maximum elevation as Yshown in Fig. l, wherein it discharges its measured content of juice through the dipper stem 44-44a and removable angular discharge nozzle 441) downwardly through stationary delivery funnel |4| into a paper cup or the like |42 standing on shelf |43. Then, as crank ||6 passes its point of maximum outward throw and returns to its normal position of rest, the action of spring |26 rotates sprocket 50 'and'. mounting disk 58 clockwise until the dipper is again in its lowermost position and, from then on is again continuously oscillated back and forth by the resumed action vof crank 81, the agitation phase being thus re-established.
All parts of the apparatus coming in contact with the beverage to be dispensed should most desirably be made of stainless steel or other material suitably resistant to corrosion or discoloration. Such parts include, for example, the bevery in the supply tank, it may also, at all times when a dispensing or vending cycle is being performed, measure out and dispense approximately the same amount of liquid from said tank, whether the` level of the liquid in the tank is relatively high or relatively low. The specific form of clipper 43 here illustrated has important practical advantagesin this connection. As shown, it rcomprises a receptacle that is generally rectangular in plan` and open on the side that is uppermost in dispensing position of the dipper. A tapered tubular adapter or funnel connection |44 unites the i4 dipper with its hollow stem 44. Viewed in 'side elevation, the dipper is seen to consist of two angularly disposed sections, one of which has its side walls |45 and bottom |46 extending parallel with the axis of dipper stem 44; while the side walls |41 and bottom |148 of the other sections extend at right angles thereto. open at its outer end, thus constituting in effect a scoop whose lip 3| clears the curved bottom of dipper trough or well 4| by a relatively 'small' Further-r the agitation produced by the rest of `thedippe'r structure, is especially eiective in preventing settlement of suspended solids and in helping to maintain the entire body of liquid in the supply tank turbulent to the extent desired.
Moreover, even Athough the level of the liquid in the supply tank may be relatively low,- the :deg`
scribed dipper construction and its mode of operation are such as to ensure that, in a dispensing or vending cycle, more liquid will 'be scooped up and momentarily carried above the liquid level by the dipper than thepredetermined quantity,-
In order that this predetermined desired quantity may be auto which it is desired to dispense.
matically measured out with reasonable accuracy in each dispensing voperation of the dipper, the.
freeedge of, each side wall |45 of the dipper section nearest the hollow dipperstem is provided with an overflow notch |49, which is most desirably located substantially at the junction of said wall with wall |41 of the scoop section. After the ascending dipper emerges from the body of liquid inrthe tank, and before the dipper stem 44 has attained a horizontal position, excess liquid spills out through the overow notches |49, the.
thus measured remainder being thereafter dispensed when the dipper, in its further ascent, has
attained the necessary elevation.
Irrthe particularembodiment of the invention shown in the drawings and hereinabove described in detail by way of illustrative example, the web of gear 89, constituting the driven-member of the clutch transmission for actuating the dispensing or vending shaft ||l| has a plurality of apertures adapted to be entered by the clutch pin of the driving member; in this way providing vfor more rapid response to depression of the vending cycle starting lever I9 than would usually be realized if there were only one such aperture. arrangement is entirely satisfactory where the dipper and dipper sump are of such ample size that, even when the liquid level in the supply tank approaches the operative minimum, the dipper will fill suiiiciently regardless of the posi-` tion within its agitating arc of swing from which it starts its vending cycle movement. However, where space is a critical factor necessitating use of a smaller dipper and dipper sump, it is of advantage to provide against the dippershaving.
to commence to move in dispensing cycle at a point'within its agitating arc too close to that endA ofsaid arc which is nearest the point of dispensing delivery. To this end, the arrangement may be such, for example, `that the dipper can start; to move in dispensing cycle only from substantial-v lythat end of its agitatingarc which is farthest,
The latter section is Such an 15,. from the point of dispensing delivery. This maybe accomplished by providing only a single aperture 90 in the web of gear 89 for clutch pin 94 to enter; and by so adjusting the angular setting of gear 89 on shaft 84 that the clutch pin can enter said aperture only at an instant when the crankl has just completed its inward throw relati-ve to sprocket D. Obviously, thestart of the dispensing movement of the dipper` can befixed at any other selected point within its agitating arc of swing by suitably varying the described timing adjustment.
What is claimediis:
1. Liquid dispensing apparatus comprising, in combination, a liquid supply container, a dipper device mounted to swing therewithin about a substantially horizontal axis, a source of power, driving means, including variable transmission mechanism, connecting said source of power with said dipper device, adapted and arranged normally to osoillate the same continuously through a limited arc ofswing, normally idle means operable in a dispensing cycle to varysaid transmission mechanism and thereby cause the dipper device to swing beyond said arc and upwardly into dispensing position higher than said axis and then to return to said limited arc of swing, and means to actuate said normally idle means.
v2.Liquid dispensing apparatus as defined in claim 1, wherein said transmission mechanism comprises aicontinuously driven shaft for producingv the oscillatory movement of said dipper device,za normally idle shaft for producing the dispensing movement, means including engageable lclutch members for connecting the two shafts, :and means for effecting engagement of saidclutch members.
n.3.zlsi'quid dispensing apparatus as defined in claim V1, wherein said `transmission mechanism comprises a continuously driven shaft for producing Athe oscillatory movement of said dipper device, a normally idle shaft for producing the dispensing movement, means including engageable clutch members for connecting the two shafts, and cam means rotatable with the normally idle shaft and operable to effect engagement and disengagement of said clutch members.
4. Liquid dispensing apparatus as dened in claim l, wherein said transmission mechanism comprises a continuously driven shaft for producing'the oscillatory movement of said dipper device, a normally idle shaft for producing the dispensingmovement, means including engageable clutch members for connecting the two shaftsgand cam means rotatable with the normally idle shaft and operable to effect engagement and disengagement of said clutch members, the active cam surface being so formed as to maintain the clutch members engaged except during a smallV part of one revolution of the normally idle shaft.
,.5. Liquid dispensing apparatus comprising a liquid supply container, a dipper device including a dipper having a hollow stem, means mounting said dipper device for swinging movement about a horizontal axis, with the dipper and an adjacent'poition of .said-stem .normally depending into said container, means continuously urging thel dipper toward one limit of normal swing, power means operable continuously to move the dipper periodically toward the other limit of Ynormal swing against the opposition of the rst means, andffuither means, connectable at will to said power mears `wherery, for a cycle yof vpredetermined dzu'aticn, said power means is operable to 16 swing vsaid dipper beyond said other limit 'and into liquid-dispensing position.
6. Liquid dispensing apparatus comprising a liquid supply reservoir, a dipper device includingV a dipper having a hollow stem, a mounting member supported for rotational movement about ahorizontal axis, means securing said dipper device to said mounting member with the dipper and .an adjacent portion of said stem depending into said reservoir, a driving sprocket secured to said mounting member, a chain trained around said sprocket and secured at one end to a tension spring which constantly exerts a pull thereon, a
motor, a crank shaft arranged to be continuouslyl driven by said motor, ga crank on said shaft to which the chain is connected, the rotation of said crank normally causing, in conjunction with said spring, oscillatory movement of said sprocket and said dipper device through a limited angle.; a vnormally Aidle shaft, a crank thereon to which said chain is also connected and which has a'` 7. Liquid dispensing apparatus :as set forth in; claim `6, which includes speed reduction gearing;
between Vsaid shafts, whereby said normally idle shaft when driven, revolves more slcwlythan the continuously driven shaft.
vS. Liquid dispensing apparatus as defined .in claim 1, wherein said transmission mechanism comprises a continuously driven shaft for producing the oscillatory movement of said dipperv device, a normally idle shaft for producing the dispensing movement, means including engageable clutch members for connecting the two shafts, cam means rotatable with the normally idle shaft and operable to effect engagement and disengagement of said clutch members, vand means for rotating said cam andthe idle shaft from clutch disengagingA position into clutch engaging position yand thereby` initiating a dispensing cycle.
9. Liquid dispensing apparatus as defined in claim 1, wherein said transmission mechanism comprises a continuously driven shaft for producing the oscillatory movement of said dipper` device, a normally idle shaft for producing the dispensing movement, means including engageable clutch members for connecting the two shafts, cam means rotatable with the normally idle shaft and operable to effect engagement and disengagement of said clutch members, vthe ac tive cam surface being so formed as to maintain the clutch members engaged except during a small part of one revolution of the normally idle shaft, and means for rotating said cam and the idle Ashaft from clutch disengaging position into clutch engaging position and thereby initiating 'a dispensing cycle.
110. LiquidaV dispensing apparatus comprising, in combination, a liquid supply reservoir, a mounting member mounted for rotational movement about a horizontal axis and provided with an aperture located at a distance from said axis, a
dipper having a stemv with a portion remote from the dipper bent at right angles and pivotally seating in said aperture, arcuate attaching members, one secured to said mounting member and another to the dipper stem intermediate the dipper and such pivotally seating bent portion and concentric therewith, said arcuate members being formed for sliding interengagement or disengagement upon appropriate pivoting movement of the dipper and, when interengaged, anchoring the dipper structureto said mounting member.
l1. Liquid dispensing apparatus as set forth in claim 6,'.wherein said clutch means comprises a pin-carrying member securedto the-continuously driven shaft and longitudinallymovable thereon, a gear loose on said shaft and apertured to receive the clutch pin, resilient means tending to maintain the pin-carrying member disengaged from said gear, a gear fast with said normally idle shaft and meshing with the first mentioned gear, a clutch-shifting lever .slidably attached to both shafts and adapted, when suitably actuated, to move said pin-carrying member against the opposition of said resilient means into clutching engagement with the loose gear, a cam member fast with said normally idle shaft and having a circular cam track, a roller cam follower trunnioned on said clutch-shifting lever intermediate the ends thereof and bearing against said cam track, resilient means restraining movement, away from said cam member, of that end of said lever which is secured to the normally idle shaft, said cam track having a depression of such depth that, when said cam member is in such angular position that said follower rests in said depression, the clutch parts are disengaged, while at all other angular positions of the cam member, the clutch parts are engaged; and means for turning said cam member in the proper angular direction to cause said follower to ride up out of said depres-f sion and effect clutch engagement for a period corresponding to the remainder of a single revolution of the normally idle shaft.
12. Liquid dispensing apparatus as set forth in claim 11, wherein said cam track is provided with a, shallow depression of slight angular extent, closely adjacent the first mentioned relatively deep depression, into which the cam follower drops upon riding up out of the deeper depression; said shallow depression maintaining the cam follower still sufficiently high to ensure clutch engagement, but serving to prevent drifting movement of the cam in event of temporary non-alignment of the engaging clutch parts.
13. Liquid dispensing apparatus comprising, in combination, a liquid supply container, a dipper device mounted on a transverse axis located directly above said container so as to depend thereinto, power means, a first normally continuously operating means connected between said power means and said dipper device to continuously oscillate the latter through a limited arc passing through a transverse Vertical plane extending through said axis, the extent of oscillation being sufficient to agitate liquid in said container but not sufficient to move said device above a horizontal plane extending through said axis, a second normally idle means connectable between said power means and said dipper device to take over operation of said dipper from said first means and to swing the dipper beyond one end of its normal arc into dispensing position above said horizontal plane whereby a dispensing cycle is performed and then return it for continued normal operation by said first means, and actuating means 18 operable to' connect said' second normally idle means to said power means for performance of one such dispensing cycle. f
14. Liquid dispensing apparatus comprising-in combination, a liquid supply container, a dipper device mounted on a substantially horizontal axis directly above said container to swing therewithin, said dipper device including a dipper having a unitary hollow stem rigid therewith which comprises a portion, remote -from'the dipper, extending substantially at' right angles tothe portion adjacent the dipper, the said horizontal axis being parallel to but spaced from said remote portion of the stem, said dipper passing close to the container bottom at thelowest point of its swing, and means for continuously swinging said dipper about said axis `to an extent suiiicient to agitate liquid in said container and means manually/'initiated at will for elevating said dipper sufficiently to discharge its content of liquid through said hollow stem toa point of delivery outside said container. v'
l5. Liquid dispensing apparatus comprising in combination, a liquid supply reservoir having a bottom and vertical side walls, said bottom being formed with a well adjacent one of said side walls, a mounting member supported for rotational movement about a horizontal axis, a dipper member having 4a hollow unitary stem rigid therewith and having a horizontal right angle portion at a substantial distance from the dipper, means securing the dipper stem to said mounting member with the horizontal portion extending therethrough and with the dipper normally depending into the reservoir well, the horizontal portion of its stem extending away from said reservoir substantially parallel to said horizontal axis but at a distance therefrom.
16. In a liquid dispensing apparatus having a cooling chamber with an apertured heat insulating vertical wall and a liquid supply reservoir therein, a circular diskl of heat insulating material substantially closing the aperture and supported for rotational movement by means wholly outside said chamber, a dipper device mounted upon said disk to swing with the rotational movement thereof and normally depending into said reservoir, and driving means for normally imparting continuous oscillatory rotational movement to said disk between limits suitable to effect agitation of liquid in the reservoir -by said dipper device, but also operable at will through a cycle of predetermined duration to extend rotational movement of said disk beyond one of said limits sufficiently to swing said dipper device into liquid dispensing position.
17. In a liquid dispensing apparatus having a cooling chamber with an apertured heat insulating vertical wall and a liquid sup-ply reservoir, a circular disk of heat insulating material substantially closing the aperture and supported for rotational movement by means wholly outside said chamber, a dipper member having a hollow unitary stem with a right angle portion formed by a rectangular bend at a substantial distance from the dipper, means securing the dipper stem to said disk to swing with the rotational movement thereof, with the dipper normally depending into said reservoir, and with the right angle portion of its stem beyond said bend extending outwardly through an aperture in said disk to a place of liquid delivery, and driving means for normally imparting continuous oscillatory movement to said disk between iimits suitable to effect agitation of liquid inthe reservoir by said dipper member, but also operable at will through a cycle of predetermined duration to extend rotational movement of said disk beyond one of said limits sufficiently to swing said dipper high enough to discharge liquid through its hollow stem to said place of delivery.
18. Liquid dispensing apparatus comprising, in combination, a, liquid supply reservoir, a dipper device including a dipper member and a hollow stem secured thereto, means mounting said dipper device for swinging movement within said reservoir about a horizontal axis and through an arc of suicient extent to include a dipper position higher than said axis for discharge of liquid from said dipper member into and through said hollow stem to a place of delivery; said dipper member comprising angularly disposed sections one having side walls and a bottom parallel with the axis of the stem `and the other having side walls and a bottom `continuous with and at-right angles to the first section, at least one side wall of said first section being formed with an overow notch.
19. Liquid dispensing: apparatus as set forth inA claim 18, wherein at least one overflow notch in the side walls off saidy dipper is located adjacent the junction of thev angularly related portions thereof, to aid in more accurately predetermining the quantity of liquid measured ,out and dispensed by the dipper device.
ROBERT R. HULL.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES. PATENTS Number Name Date 1,513,413 Moron Cct. 28,v 1924 1,863,250.YV Morse et al June 14, 1932 1,929,243 Harper Oct. 3, 1933 2,341,145 Kirkpatrick Feb. 8, 1944 2,378,430 Polsen et al. i June 19, 1945