US1956613A - Heat transfer facilities in ice-cream freezers - Google Patents

Description

May 1, 1934. J. -l. CORN El AL HEAT TRANSFER FACILITIES IN ICE CREAM FREEZERS 3 Sheets-Sheet 1 Original Filed Feb. 29, 1932 Uo/"n/ y 1934 J. I. CORN ET AL HEAT TRANSFER FACILITIES IN ICE CREAM FREEZERS- Original Filed Feb. 29. 1932 3 Sheets-Sheet -2 69 Z nvezaio/ts Corvz/ May 1, 1934. Jqmom ETAL- 1.956. 13

HIM} TRANSFER FACILITIES IN ICE CREAM FREEZERS ori inal Filed Feb. 29, 1932 I 3 Sheets-Sheet 3 Patented May 1, 1934 PATENT OFFICE HEAT TRANSFER FACILITIES IN ICE-CREAM FREEZER Julius 1. Corn and Ralph E. Hyatt, Chicago, Ill.,

assignors to Ice-Cream Freezer Corporation, Chicago, 111., a corporation of Illinois Original application February 29,

Divided and this application July 30,

595,700. i932, Serial No. 627,160

1932, Serial No.

1 Claim. (c1. 257-10 This application is a division of our application for United States Letters Patent freezers, Serial No.

for Ice-cream 595,700.

in ice-cream freezers, and has for its principal object the provision of an ice-cream freezer of such neat appearance and compact form as to be suitable for mounting on a store counter, such, for instance, as the counter generally provided in front of a soda water fountain.

As will hereafter be seen,

freezing compartment is statype wherein the our freezer is of the tionary and scrapers and heaters are mounted to rotate within the Ice-cream freezers are freezing compartment.

devices in which occur changes of te perature through relatively wide ranges becaus domestic, making of hot fluids, especially in the commercial, and also in the ice-cream relatively warm or in the cleansing of the apparatus, are frequently introduced into the freezing' chamber. The

\ placing of material in the freezer subjects hot or'even warm the freezer to the wide range of change of temperature above noted,

and, for this reason, in the development expansion of the g ployed for absorbing that the introduction of warm little progress has been made of apparatus in which direct ases in the freezer are emthe heat, it being understood or hot materials into a freezer employing a direct expansion cooling system will inevitably produce relatively high pressures in the exp It has ice-cream freezer in anding gas.

been one of our objects, to produce an which the owner may employ for cooling purposes either the circulation of a cool brine or direct expansion of gases as he may desire, or may be equipped to use, and that in the event that he desires to use the direct expansion method of cooling, he

secure cons'derably increased eflity and thereby can do so with perfect safeciency and quicker freezing of the product.

For accomplishing the above object we have increased the effectiveness of our apparatus by encircling the tank forming the freezing compartment with a constrictive coil of tubing and tinned the tubing directly to the exterior of thetank,

whereby the conduction of heat from the freez-- ing compartment is facilitated.

to the refrigerant in the coil As will hereafter be seen the coil of tubing hasver the tically which insures a quick refrigerant throughout the coil as well as a" complete drainage from the coil of such oil or lubricant asmay be employed with the refrigerant. The use of such a coil not only permits the satisfactory use of a cool brine as a terials are introduced into freezing compartment easily be made sufliciently strong to insure against expansion is employed and warm or heated-mathe freezer. In our freezer we have also designed the base and freezing compartment, which ismounted on the base, so that the freezing compartment may be positioned with respect to the base to bring the discharge port upon any desired side of the installation.

We have attained the foregoing objects by means of the structure illustrated in the accompanying drawings, in which- Fig. 1 is a vertical elevation of an ice-cream freezer embocitying our invention. 7 Fig. 2 is a op plan of the structure shown in Fig. 1.

Fig. 3 is a se tion on line 3-3 of Fig. 1.

Fig. 4 is an elevation, the exterior walls bein partially broken away and the, interior beaterdrive mechanism sectioned on line 4-4 of Fig. 3.

Fig. 5 is a section on,line 5-5 of Fig. 3.

Similar reference characters refer to similar parts throughout the respective views.

The base is generally cylindrical in form and consists of a lowermost, intermediate and upper section, 10a, 10b and 100. Journaled transversely and eccentrically of the intermediate section 10b of the base is a shaft 11, one end whereof extends out of the base for coupling with the shaft of a motor not Upon the portion shown; of the shaft 11 within the base is provided a worm 12 which meshes with a worm wheel 13 fixed to a shaft 14 journaled vertically in and centrally of the base. The top of the shaft 14 is associated with a Cool: seal 15, an apparatus to be obtained upon the market and which is no portion of our present invention. The ,Cook seal terminates upwardly in a shaft 16 provided with a vertical, centralslotl']. a The top member of the base is provided with a. laterally extending flange 18 through which extends stud bolts 19 for securing the upon the base. The 10- cations of the stud bolts 19 and the apertures 100 in the flanges 18for their reception are equally spaced about'the circumference of the flange 18 so that the freezing compartment may be assembled with the base in different positions. The freezing compartment consists of a suitable bottom casting'20 of disk form and a top casting 21 of the form of an annulus, between which top of metal walls of the tom casting 20 is a central depending tubular development 23 for the accommodation of the Cook seal, and adjacent the edge of the bottom casting 20 is a tubular development 24 providing a discharge passageway from the freezing compartment? The outer end of the development 24 is closed by a gate valve 25.

Seated upon the casting 20 is a spun metallic container 26 the bottom and side walls of which are integral. The bottom of the container 26 is perforated centrally to permit the passage of the split-shaft l6 and eccentrieally so as to register with the bore of the discharge development 24'. The upper edge of the container 26 fits within an annular channel in the top casting 21. Wrapped about the container 26 is a coil of tubing 27, which is preferably slightly flattened, and after the coil has been put in place the coil 27 and container 26 are dipped in a bath of melted tin, which secures the coil to the container and provides a continuous metallic path 27a therebetween. The coil 27, before its assembly with the container 26, is preferably wound about a mandrel of slightly smaller diameter than the container, whereby, when it is assembled .with the container, it willexert a slightly constrictive pressure upon the container thereby insuring a more intimate relation between the coil and the container and eliminating any relative movements between the coil and container when pressures are developed within the coil.

The lower end of the coil formed of the tubing 27 is sweated into an interiorly threaded port 23 provided in the casting 20, and the upper end of the coil 27 is continued in a downwardly extending piece of tubing 29 which is suitably secured in another interiorly threaded port 30 provided in the casting 20. The space between the ex terior of the coil 27 and the interior face of the cylinder 22 is filled with suitable heat insulating packing 31.

Proportioned to enter the container 26 is the rectangular frame consisting of the bottom member 32, the top member 33 and the vertical side members 34 and 35. Centrally of the bottom member 32 of the frame depends a tubular embossment 36 into which enters the top of the split-shaft 16 and running-diametrically through the tubular embossment 36 is a fixed pin 37 which enters the slot 17 in the top of the shaft 16 so that the rotation of the shaft 16 secures the rotation of the frame. The bottom member 32 of the frame is provided with upwardly curved blades or developments 38 which function to carry the semi-frozen contents of the container 26 to. the discharge port.

Depending from the lower face of the member 32 are bored semi-circular developments 39 which pivotally carry a bottom scraper blade 40.

Vertical scraper blades 41 having bifurcated ends are pivoted by heated bolts 42 between the v upper and lower frame members 32 and 33.

From the central portions of the lower and upper frame members 32 and 33 are developments or extensions '43. In the extensions 43 from the lower frame member are Journaled the lower reduced ends of beater shafts 44. Allgningwith the Journals in the extensions 43 of the lower frame member in the extensions 43 of the upper frame member are mounted removable bushings 45 for accommodating the upper reduced ends of the beater shafts 44. The employment of the removable bushings is for the purpose of permitting us to adjust the relation of the beater blades 46 carried by the respective beater shafts .44 with relation to each other, as we have found that by causing the beater blades 46' on the respective shafts to cross the line joining the two shafts at different times the violence of the action of the heaters may be greatly reduced.

Upon the reduced upper ends of the beater shafts 44 are fixedly secured gears 47. Journalcd in the central portion of the upper frame member 33 between the bushings 45 is a stub shaft 48, to the lower end of which is fixedly secured a gear 49 meshing with the gears 47. The upper end of the stub shaft 48, which extends above the upper frame member 43 extends into an aperture in the cover and is centrally slotted or apertured at 50 to assemble with a driven clutch member hereafter to be described.

Fitting within the central opening of the an' nular upper casting 21 is a top or closure 51. To hold the closure 51in place arms 52are pivotally secured to the annulus 21 by stub bolts 53. The free ends of the arms 52 are bored and tapped for the reception of milled headed screws 54 which 1 are screwed down upon the closure 51 to hold it in place. The center of the closure 51 is perforated and from the under surface of the closure about the perforation is an embossment providing the shoulder 55, which shoulder is adapted to 1 receive and provide a bearing for the shaft 48. Mounted above the shaft 48 in the central aperture in the cover is the conical headed driven clutch member 57, the lower end whereof is reduced and enters the recess or slot 50 in the stub 1 shaft 48. Aboutthe central perforation in the closure 51 is an upwardly extending tubular em- I bossment 58 which is interiorly tapped to receive the knurled and headed bolt 59, the reduced lower end whereof is provided with a conical recess 60 1 to co-opcratc with the driven clutch member 57.

It will .now be seen that by retracting the knurled and headed bolt 59 the driven clutch member 57 will be released to rotate freely, which will permit the gear 49 to rotate with the scraper and heater frame and no axial rotarymotion will; be imparted to the beater shafts 44. Such a nonrotating adjustment is. desirable while the material in the freezer is being chilled and before it commences to freeze. When freezing has commenced the bolt 59 is screwed in which delays the rotation of the driven clutch member 57 and starts the axial rotation of the beater shafts, the rate of rotation of which may be controlled by the extent to which the bolt 59 is screwed in and the rotation of 'the shaft 48 delayed. By such a control'of the rotation of the beater blades we can adapt our mechanism to a wide range of materlals and also produce a product of the desired consistency.

Having described our invention what we claim as new and desire to secure by Letters Patent is:

An ice-cream freezer comprising a base and a freezing compartment mounted upon and supported by said base with its axis disposed vertiinterior metal container about which is coiled tubing, said tubing and container having the interstices therebetween filled with tin.

JULIUS I. CORN. RALPH E. HYATT.

cally, said freezing compartment including an

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