Патент USA US2134268код для вставки
Oct. 25, 1938. H.. F. swENsoN 2,134,268 ICE CREAM FREEZER Filed Jan. 22, 195e gmc/nto@ ç HqrvcgyESweïwop ' 2,134,268 Patented Oct. 25, 1938 UNITED STATES . ICE ’f y f - V2,134,268 10E CREAM Finalizan Harvey F. Swenson,` Seattle,> Wash. -. Application January 22, „1936.kk «$0,213> 3 claims.- (ci. 1259-9) My invention relates to ice cream freezers .and particularly to an ice crealm freezer that is adapted for use in ice cream parlors, hotels,- drug stores and restaurants where the ice cream [is ¿7,5 servedl to the trade directly from the freezer. Certain mechanical objects of the invention are first, to provide an ice cream machine having> a freezer drum equipped with a plurality of ñns or splines whereby the area of the freezing: trans .119 fer surface is considerably increased, and av uni form passage is provided for the flow of the re frigerant whereby settling and collection of 1u bricant on metal surfaces in the refrigeration system is eliminated; second, to provide a foot ¿l‘ë pedal for electrical operation and -control .of the freezer whereby ice cream may be discharged directly from the freezer drum into receptacles thus leaving both hands free to handle there ceptacles; third, to provide .a cut-off door for V¿240 the discharge port of the drum which doorr is de signed and shaped in such manner that both large and small receptacles may be equally and read ily ñlled therefrom; fourth, to provide afsimpli~ fied front bearing for the dasher which is trouble ¿2_.5 free, simplifies the opening and closing `of >the drum door, and eliminates expensive replacement cost; and fifth, to provide a leak-proof gasket consisting of a small rubber tube set into an 4an nular groove on the inside of the drum door_whích :.3‘0 is easy to remove, clean or replace. The most important electrical object of the in vention is to provide means whereby the motor of the compressor unit, which unit supplies the compressed refrigerant to the freezer unit, cannot :35 operate without accompanying operation, of the YReferring.in_deijail A to Ltljie Adrawing ~ throughout whichliklerevference >*designate like parts', .the nu' meral 5 indicatesïthe main >frame` of the machine which may have a housing l6 superimposed there >on`ir1 l`any„desirablei manner. i A >freezer> t‘I _.5 is mountedl within thehousi?g _inany suitable' manner, and _ya l'refrigler'atking f8 e envelopes saidfreezer drum vleaving an expansionvchamber 'therebetween A l sheetfmetal casing . 9v surrounds .the.rêflîigeratingfdrum and the space_between is 11_,0 'ñlled'~with 'cork or Í other ` insulative" IriaterialV as shown at, l 0.' The forward-ends" ’of` the casing'and refrigerating ldrum are @closed-byva front lwall’ ,Íllll ~ leavingfthe' forward end> of> the. freezer 'drum' open as most~v clearly _shown inlî‘igj, 3 ofV the’d'rawing. >15 A drum idoorflzis' hinged atlete thejfront " wail Il. Av barili is also connected to the hinge », ' _I¿3..and extends`directly~`across'the' outside ofthe . door with its forked end »|¿5`r arranged tostr'addle ' abolt .i6 which 'is pivot'ally connected to Lthe 20 Lfront wall >`ll anÍd I?iayflie 'swung' outwardly fas yshown'i'ny dotted‘lines'in Fig‘. 1. Saidbolt is‘fpr'o same islscreweclv down_` tightly against the `forked .end -I_.5,Íthe.b,ar I4`Íwill hold the door I2 in a closed 2.5VV ` leaky-‘proof position; An important~ feature of »the invention 1j_esides'„_in.the` small rubber _'tub'e gasket Vided'in the 'rear surface efthedoor ¿|21 `Thus, when .the ¿door is >held lm ‘the‘lciösed A.pòsition' by 30 ì the barkeit. thegas'ket will _’_b'e pressed -against the front -~wall >il 'thereby`.preve`r1tin`g"any leakage from the door. The tube gasketmay be readily _ ' removed for cleaningpurposes.` " ' îThe upper portiondof. the drum door I2 is pro- _35 - . freezer motor which operates the dasher ofthe .vided :with ka 'down-_spout_entry_portj Z0 which ` freezer unit. communicates -directly:'with’fthe interior ,of the In the drawing: freezer _drum`1 Whenftlíe door i's closed'. The lin Figure 1 is a View in front elevation of the com gredients4 for makingfice cream` areiedw into „the „, 450 plete machine; Fig. 2 is a view in vertical section `.drum through'thisentry port and its top- is pro- ,40 taken substantially on a broken line.2-.2f0fVF_ì.g. kvidedlw'ith a `hingedlid 2l which *excludesdust‘ " 1 and showing certain parts in elevation; Fig. :3 and other foreign matter.r The'lower Afportion'of , is an enlarged fragmentary View> in vvertical sec "the door l2 jis}provided„_wíth' a projectingÍ dis tion of the forward part of the freezer drum and ‘ ` chart-,felv port >.22] fwhlich‘ alsoy ` communicates' , with 45 associated parts; Fig. 4 is an enlargedv'de'tail the‘freezer drum Iwhen ->itsjdoo’r is closed. [Af cut- _4_5 View in rear elevation of the drum door and con toffe door .23 ‘is "pivoted to this port by v`a boli-,.24 nected parts; Fig. 5 is a View in transverse verti , cal section taken on a broken line 5_5 of Fig'.'3; Fig. 6 is an enlarged detail view in longitudinal 50 section of the front dasher bearing; Fig. .'7`isa ' corresponding view showing the connection >of the dasher shaft with the drum stub-shaft; and Fig. 8 is a View in diagram showing both the elec trical and refrigerating elements Yand their ar E*55 rangement. whichfhas a heavy spring 275 interposed between the- hea'd'of the boltand the door for compressing the Vcut-,off >door 'against the open end lof Á thev port 'thusßmaking it leak-proof. `This door -is v5„0 pivotally raised by a` handle 26;'_and lan important'-` ‘ . feature xof thisdoor residesîin `the sonrievvhat'reef- y ltangular recess"21 provided in its lower edgepor tion. This `rectangular recess, withits- rounded "cornersglÍisyso'shaped ~that it lwill vpermit a small’i5?5 n' ` 2 2,134,268 quantity as well as a large quantity of ice cream to be discharged from the port 22, depending upon the distance the door is raised, and thus large as well as small receptacles may be filled with equal facility. When filling receptacles, they are either held in the hands or placed upon the shelf 28 which is secured to the frame 5 or housing 6. Another important feature resides in the small front bearing A29, shown in detail in Fig. 6, which toward the discharge port 22 when the dasher is rotated, say, in a clockwise direction. A foot pedal 48 is fulcrumed to the lower portion of the frame 5, and a rod 49, which is pivotally con nected to said foot pedal, extends upwardly to av foot pedal switch 50.k Pressure of the foot upon said pedal causes the switch to rise and close the >circuit from lead-in wires 5| and 52 to the dasher motor 45, as shown in the diagram View in Fig. 8. This foot switch is provided with a spring 53 10 has a flanged head 30 and a hollow recess 3|. This bearing fits into a hole 32 through the drum which causes it to return to its normally lowered gaged by the bar I4 which _thus Aserves the double `are of prime importance for the reason that an Yattendant may ñll a half dozen receptacles, such position when the foot is removed from the pedal, door l2, between the entry and discharge portsl thus shutting off the dasher motor 45. It will 2| and 22 respectively, and. is centrallydisposed thus be seen that this foot pedal and its switch with respect to the freezer drum '|. VItsA head 3D ` are for momentary use and as a convenience in 15 .filling and serving ice cream receptacles. They bears against the outside of the _door_and is en purpose of retaining both the d'ö'or andthe bear ing in a closed leak-proof position as willbe Aun as saucers or cones carried in both hands, by stepping on the foot pedal thus causing the 20 derstood. The recess 3| in’this bearing receives the reduced end of the'dasher shaft' 33 `which dasher to force the ice' cream within the freezer isïsimple and _inexpensive to install andrenew, drum ‘I into the discharge port 22, and by raising andY lowering the cutfoff door 23 with the wrist V'freely rotatesl therein;j This small front bearing and provides _novel means whereby the freezer or other disengaged part of the hands or arms. drum door |2` may be opened and closed without The foot pedal results in quicker service, the use ofless electrical power, and in a better quality of expensive and complicated structure. The finsior splines 34, which are interposed in >the expansion chamber between the freezer and refrigerator 'drums 1 and 8- respectively, form still another important feature of the invention. _These fins are rectangular in cross section and are preferably, though " not necessarily, an in~ tegral part of the refrigerator drum`8. They‘ex `tend longitudinally of the drums,_each alternate ‘ one terminating shortof the rear end of the drum 'and withthe other intermediate ones terminating short of the frontend of the> drum, as shown at '35, so as to form a continuous and circuitous p_as ice cream. , ' A refrigerating unit, comprising a compressor 54,`a"motor 55 for operating the compressor, a pressure tank 56, and a pressure control switch 51, is mounted on the lower part of the frame 5. It is understood that no claim of novelty is made for the compressor except insofar as it may en_ter into novelcombination with the elements of the ice cream freezer. The small pipe 36 conveys the compressed refrigerant from the pressure tank 56 tothe expansion chamber between thefreezer and refrigerator drums 'l and 8 respectively sage back and forth allaround the drum'. Thus, wherein the refrigerant expands, creating the „ the refrigerant, whichl Venters the expansion chamber under pressure inthe form of liquid necessary frigidity, and then returns through the larger pipe 31 to the compressor 54 and tank 56 through a small pipe 36„divides itse1f,.h'alf flow vthus completing its cycle. I prefer to use methyl Vchloride as the refrigerant by reason ofits non explosive nature, although any desired refriger- ., ying around one sideofthedrurn' and half going ‘around the other side, and passes‘joutthrough a -larger Ypipe 3l. These splines ‘or fins provide a vant may,Y of course, be used. A pressure'jof from uniform -passage for-the flow ~ofthe refrigerant >eighty to one hundred vand twenty pounds is . -'around >the drum whereby lubricating oil,v which -is v>carried ‘in- suspension> bythe refrigerant, is maintained by the compressor depending upon conditions of operation, and the pressure- switch ,1. vpreventedjiîrorrfA settling and collecting von, the 50A metal surfaces in the` refrigerating system, and materially increase the area ofthe freezing trans fer surface, and `thus increase the efficiency of the Y ' machine. The rear end of the‘dasher shaft 33 is enlarged by a flange head 38 whichis' Vcentrally provided 51'is`conn'ected to the compressor and interposed „ . in the circuit for reasons presently set forth. A to thermostatic expansion valve 58 is interposed in the small high pressure pipe 36, and theV entire portion of the pipe between said expansion valve 'andthe compressor tank 5S, being normally at a ,., partialk vacuum or under low pressure, the pres with a recess and groove or slot v39'diametrically Ysure within said pipe portion will increasev upon operation of the compressor and extend into the across the rear end ofthe head which `recess re ceives the inner end of arstub shaft 40, and a pin expansion chamber between the drums 'l and 8 60 forms’ a detachable connection'for the rear 'end where it will rapidly expand thus absorbing high , ’temperature and creating low temperature which of the dasher as'shown in Fig.V 7. Thestub shaft ¿freezes the ice cream mix within the freezer drum . f4| passing therethrough andiseated in the groove " 65 40 isfjournaled through the reaïr end of the freez .1." A magnetic valve switchv 59 is also interposed ing and refrigerating drums, and "its outer end is in thehighÍ pressure pipe 36 for reasons presently providedY with a large pulley 42 >having belts 43 Íset forth. extending to a small _pulley 44 keyed to the shaft , A thermal bulb 60 is connected to the low pres of a dasher motorv 45. The dasher shaftv 33 has a 'pair of oppositely curved blades 46 secured to or integral with each of its ends'which blades rotate finjuxtaposition with the inner wall of the freezer 'drum"|, and aplurality of oppositely disposed iiat "spacedëapart‘paddles‘or ñngers 4T'integrally con `>nected to the dasher shaft,_terminate inside or 'short of the dasher blades; "j " ’ ‘ ` ` ‘i ‘ 58, which valve is'so adjusted that, when frost is on the-low pressure pipe, the bulb causes the said ’ Aexpansion valve to close, thus operating the ex pansion valve in direct relation and proportion to the- temperature or amount of frost ron-«the low >The'paddles or fingers> 41j' aresofslanted as to 'pressure return pipe.H The'frost line does not ` cause’the >semi-'frozen ice cream' to move forward 65 ure'return pipe 31 and a capillary tube connects ¿said bulb with the thermostatic expansion valve reach the thermal bulb until the latterstages‘of a 2,134,268 3 freezing takes place when Vthere isV less expansion out of circuit. This willfprevent current> from ofV the refrigerant and a consequent overflow` of » passing over the wirep68 through the compressor the same, in the compressed liquidstate, into the hand switch 63'and to thecompressor motor 55 low pressure pipe 31, whose continued expansion over. the Wire‘ 69, vthus stopping said compressor causes low temperature and frost to a point on motor. ‘u This featureis important Afor the reason the return pipe whereby the thermal bulb will be that it'preventsthe ice cream mixture within ' caused to operate and shut off the expansion ' the freezer: druma‘l .from being frozen solid while l Valve 55, thus enabling the compressor1 54 to func in a static conditioncaused by non-operation of tion more rapidly and increasing the speed of the the dasher as will be understood. 10 freezing process. 'I‘he dasher motor 45 may beV operated by the In the operation of the system, assuming that foot 'pedal switch 50 without closing the Acom 10 ice cream mix at a temperature of from forty pressor hand switch 63, and the circuitisso ar to seventy degrees Fahrenheit is placed in the ranged that the dasher motor may be operated freezer drum 1, the freezer hand switch desig by the foot pedal switch independently of the nated by the numeral 6| is manually closed pressure switch 51 or any of the other controls whereby the circuit wire 62 is also closed. The on the machine except the thermal switch 61. 15 current will ñow through the magnetic valve 59, In the operation of the foot pedal switch, the opening same and allowing liquid high pressure current flows through same in its normally low- ' refrigerant to pass into the thermostatic ex 20 pansion valve 58 which allows a measured ered position only when the pressure switch 51 is closed, and in this position the dasher motor 20 amount to pass on into the expansion chamber cannot be operated by said foot pedal switch. between the drums 1 and 8. It being understood However, when pressure is applied tothe foot that the double pole compressor hand switch 63 pedal and said foot pedal switch is raised to is closed at all times, and inasmuch as the pres 25 sure switch 51 is connected to the magnetic complete the circuit through the wire 5I, which is connected directly to the outside source of valve 59, by wires 64 and 65, and said pressure power and is alive at all times, the dasher motor switch being set to close at a pressure of substan will be set in motion. Inasmuch as the com tially ñve pounds, this switch will close and pressor motor is wired in ahead of the foot pedal allow the current to flow through a wire 66, switch at the point designated by the numeral 30 through the foot pedal switch 50 in its normally 1I, the operation of the foot pedal switch does 30. lowered position, through the wire 5l and a not effect the operation of the compressor motor. thermal coil operated dasher motor switch 61, This independent feature of operating the to the dasher motor` 45, operating same and com dasher motor is particularly useful in serving iceA pleting its circuit by returning over the wire V52. cream as hereinbefore mentioned. 35 At the same time the current will also ñow ~ through a shunt wire 68, through the double I claim: ` 1. In yan ice cream freezer comprising a freezer pole hand switch 63, then through a Wire 69 to the compressor motor 55, operating same and drum having an openend, a front wall surround- . cause a partial vacuum to be built up in the wall and arranged to close the front end of the ’ returning through a wire 10, through the other ing the open end, a doorr hinged to the front wall 40 pole of the compressor hand switch 63 and thus ` and arranged to bear against the> front wall and completing its circuit through the wire 52. The close the open ydrum end, an outwardly project- 40 thermal switch 61 is provided in case the dasher ing discharge port carried by the door and com becomes stalled by over frozen cream or other municating with the drum, Va cut-off door pivoted flatly to the outer end of the port and arranged cause which would build up an overload of cur Yto open and close the port when it is pivotally 45 rent, this switch will throw out thus breaking the circuit and preventing the dasher motor from swung up and down, and said cut-off door having a rectangular recess in its lower edge portion being burnt out. Provision is also made for oper ating this thermal switch by hand in cases of `ranged to be brought into communication with the port when the door is pivotally moved to reg emergency. v ulate the size of the port opening. When the ice cream mix is frozen to the proper 50 2. In an ice cream freezer comprising a freezer» consistency, the freezer hand switch 6l is opened which closes the magnetic valve 59 and thus- drum having an open front end, a front `wall shuts off all ñow of the refrigerant. This will surrounding the opening, a door hinged to the 55 compressor 54 by suction thus reducing the com pression which causes the pressure switch 51 to open. This pressure switch, being wired in circuit with both the dasher motor 45 and com pressor motor 55, both of said motors will be 60 stopped. Herein lies the most important elec trical feature of the invention, namely, the com pressor motor 55 cannot operate without'running the dasher motor 45 for the reason that the current which operates the compressor motor 65 must iiow through part of the same circuit which operates the dasher motor, namely through the wire 56, it being understood that the foot pedal switch 50 is in its normally lowered position. For, if we assume that the freezer hand switch 6l is open and the compressor hand switch 63 is closed, it is apparent from the foregoing that the said open hand switch will close the magnetic’ valve 59 thus reducing pressure of the com pressor 54 and thereby causing the pressure 75 switch 51 to open and the wire 66 to be thrown drum, said door having a hole therethrough con centric with the drum, a dasher mounted for ro 55 tation within the drum and having a central shaft with a reduced projecting end arranged to register with the hole through the door, a small bearing ‘having a recess and a flange head. insert ed into the hole with its head bearing against 60 the exterior of the door, the recess in the bearing arranged to receive the reduced -end of the dash er shaft, a cross bar hinged to the front wall and arranged to `engage the flange head of the small. 'Y y bearing, and means. for clamping said bar against 65 l the head of said bearing. 3. In an ice cream freezer comprising a freezer drum having an open front end, a front wall surrounding the open end, a door hinged tc' the wall and arranged .to close the front end vvof the drum when the door is swung into engagement with the front wall, said door having a hole there through concentric with the drum, a dasher mounted for rotation within the drum` and hav ing a central shaft with a reduced projecting end 75 4 2,134,268 arranged to register _with the'hole through the' gagement With the 'head'of the bearing, and door, a» small bearing inserted in `the ~ho1e in the door, saídrbearíng havîhga 'recess and a‘flangev head bearing against the-exterior of the door, the reduced .end of the dasher shaft mounted in the recess of the'bearíng, across barrßhînged» to the front wall andrextendíng across‘vthe door’in en means for clamping the cross Ybar against the head vof the bearing whereby same is held in se cure engagement with the door and the door is held; in secure engagement with the front wall. 5 HARVEY F. sWENsoN.