USRE21827E - Continuous confection freezing apparatus - Google Patents

Description

I June 17, 1941. Q c so ETAL Re. 21,827

CONTINUOUS CONFE CTION FREEZING APPARATUS Original Filed Dec. 20, 1957 s Sheets-Sheet 1 CHARLES ERJCKSON 1w ERICK SPELLMAN INVENTORS ATTORNEY CONTINUOUS CONFECT ION FREEZING APPARATUS Original Filed Dec. 20, 1957 3 Sheets-Sheet 2 LL :3 b

41 N L' i l) 0 a G "-4 1 sill to i? Q; 3) U4 5 3 21+ V {30 g o Eg 53 T I 1 EH"' f 5;

M T- g 1 h iun liillml q i H ,lihirg'm. I, CHARLESERICKSON M ERICK SPELLMAN I INVENTOR. 02

ATTORNEY.

I Re. 21,827

- 3 Sheets-Sheet 3 June 17, 1941. c. ERICKSON ETAL CONTINUOUS CONFEGTION FREEZING APPARATUS Original Filed Dec. 20, 1957 CHARLES ERICKSON AND ERICK SPELLMAN MENTOR TME ENE r zone to the discharging head of said machine;

seamed June n, 1941, o

" OFFICE.

Iriohon and his: snnnmn,

New run-n. y.

on h m. 2,191,344, dated February :0, 1m. SerialNo. IQOJOLDeeeInbes-M, 1,87. Application fol-reissue freezing confection, ice creams and wstards. etc,

in continuous operation, without the use of iceand salt, and particularly that type which is completely self-contained. and automatlc'in operation. The object of our invention is top)- .vide an automatic machine for freezing various types of creams, custards, and the like, in continuou's operation and capable of producing a uniform, smooth product of the highest quality.

Another object is to have a machine'of this character which operates positively without using any pump or-the like, for forcing the fluid starting material through the machine in order to feed the cream or the like, through the freezing a further object is to construct a m of this character in" such direct and simpleman- 'ner thatthe same maybereadilydisassemhled for cleaning and all parts requiring attention are easily accessible. 1

It is also an object of our invention to provide a machine of this type with a special feed shaft p substantial in construction, and economical and highly efficient in operation.

Another object could bementionedsuch as providing not only the main portion of the machine with chilling coils for freezing the product 1, 194., Serial No.

:1 Claims. (or sz-nn upper portion ofthe front end of the machine disclosing the interior construction and the re lations of the parts.

Fla. 3 is a front elevation of the same machine. 4 is a transverse section of the machine upon line IV-IV in Fig. 2.

Fig. 5 is a transverse section of the feedshaft of the machine taken on line V-V in ll 'ig. 2. Fig. 6 is a front elevation of the same feed shaft.

Finally, Fig. 7 is a side elevation of the feed shaft in erect position and showing diiferent angular positions of some of the parts than in Fig, 2; due to partial rotation from the position of said shaft in the latter figure. Throughout the views thesame reference nuv metals indicate the same or like parts.

within a cylinder in which the feed shaft rotates,

l but also providing a receptacle beneath thehead otthe machine with chilling coils to retain the finished product in freezing condition when received in said receptacle from said head;

inherent in the design. construction, principles and operation of our machine will become more apparent in detailed manner as this specification proceeds.

In order to bring out the features of in- -venti0n in a comprehensivemanner, the same is illustrated by way of example in a practical form in the accompanying drawings which form part hereof.

Hence, in Fig. 1, a machine made according to our invention is shown in sideelevation.

Pig. 2 is a longitudinal section through the HenceJn the practice of our invention, atable In the confectionery freezing arthorisontal freezing apparatus has become a vogue and not without reason. It is theoretically attractive to feed cream, or the like through a horizontally peared heretofore for several reasons, the main .reason being that said machines have not been refrigerated by coils but by ice and salt; and another reason being that no practical andpermissible means have until now-been available in view the present invention isintended to place 'theartoffreezingcreamsandcustardsuponan;

entirely new basis and introduce a new standard of mechanical excellence, eiiicienc'y of operation, and quality of product.

generally indicated at I and provided with legs similar to 2 and 3, is provided with .an upper supporting portion or top 4, and the lower shelf or supporting portion upon which a mechanical freezing unit, represented by the rectangle 9, is disposed. This.unit may be electrical and of any suitable type, and in this respect the particular form of such freezing unit is of no consequence as several types are on the market, but in any case such freezing unit has tubes 1, 8, 9 and I9 and circulates a freezing fluid to various parts of the machine as will presently be explained. It might, however, be mentioned that pipes 9 and Ill may be controlled by valves ll and II respectively, while, on the other'hand,

an automatic master control valvemay be connected to both pipes 9 and III in order to control flow through the same, and may even "be arranged to control pipes I and 9 in addition, and for this purpose pipes I and 8, as-well as pipes 9 and I9 may be connected in parallel or they may be connected in series.

Above the freezing unit 6 upon the table top 4 is a horizontally disposed cylinder I3 around which pipe coils similar to l4 are closely =wound from practically one endof said cylinder to the other, said coils connecting with pipes l and Bpreviously mentioned, so that freezing fluid from the freezing unit 6 may circulate about the cylinder and chill the wall thereof from end to -end. The cylinder-is provided at the forward end with a heavy supporting plate and at the rear with a similar supporting plate It, both of which rest upon the table top 4 and are rigidly secured to the same. Aboutthe pipe coils l4 upon the cylinder is a heavylayerof insulating mineral wool H, or the like and. a sheet metal cover I9 is arched over the whole between the end plate It and ii and secured down upon or adjacent to the table top 4 so that the mentioned wool orflbrous insulating material about they pipe coils will be kept in place and concealed from view. Within the cylinder i3, is an axially disposed feed shaft H which passes through a bearing in the rear plate l6, and is connected by a reducing gear mechanism 2| to a motor or -other drive 22, the details of these last mentioned parts being superfluous to illustration as forming no essential part of the novelty of the present invention and being merely conventional.

, The front end of the shaft is carriedin a hear-- ing formed in a discharging head 23 removably secured upon the front plate i5 bymeans of hand screws 24, 24, etc., this discharging head having an interior flange 25 which effectively centers said head and thereby the bearing portion 29 of shaft l9. The features and operation of the feed shaft will be presently explained.

At a higher level than that of the cylinder l3,

preferably at the rear of the machine, is a removable tank or supply container 21, having a top opening 29, through-which to introduce. a liquid mixture afterward intended to be frozen in the machine. said supply container being sup,- ported upon a pair of brackets-similar to 29 having upright portions 39. secured upon the table top 4, and, if desired, also steadied by means of a bolt It or the like, secured to rear plate It.

The supply tankv or container 21 may have acylindrical form or any other form that is found convenient, and is providedat the lower portion with outlet control valve 32 and a feed pipe 33 which terminates approximately above the center of a funnel or receiving cup 34 which is screwed or otherwise attached to the upper part of the freezing zone of the cylinder but also in a meas-' container placed into position uponbrackets 29,

it .is obvious that upon opening valve 32 to the proper degree a continuous stream of fluid will descend from pipe 33 into the receiving cup 34, and said fluid will then descend at a predetermined rate through bottom aperture 35 of said cup into the interior of the cylinder to be beaten and frozen and also propelled forwardly to the front and expelled as will be immediately explained.

The'sald shaft I9 is provided near its rear end within cylinder 13, with a group of beaters 36, 31,

39, each of which may be perforated as-at 39.

The beaters or paddles serve to beat or churn the fluid custard in the rear portion of the cylinder as the mix enters and said mix is subjected to a predetermined chilling or initial freezing, and in V order to make certain that the beating is effective and no accumulation of material occurs upon any portion of the interior wall of cylinder H, a very slightly curved scraper 49 is arranged upon the shaft, being fixed or supported thereon by means. of radial arms 4|, 4|, etc., each arm being secured upon the shaft by means of a ring or member 40'. The sphere of operation of the above mentioned paddles and scraper may be termed the first or chilling zone in as much as two other zones follow in the center and forward portions of the cylinder. The second zone forms the sphere of operation of a smooth, spirally shaped or curved scraper 42 which is mounted on arms 43, 43', etc., each secured to a collar or member 42' rigidly fastened to the shaft i9, and serves not only to scrape the sides in the first actual ure to propel the frozen material forwardly toward the front of the machine. It is to be noted that the arm 4| supporting scraper 49 is secured to the same member 40. as arm 43 which supports scraper 42 and is disposed at an angle thereto which maybe a right angle, approximately as shown in Figs. 2, 4 and 7.

The third freezing zone'within the cylinder is scraped by a scraper 44 having a curvature which is more pronounced than that of scraper 42 so that it will have not merely a scraping effect but an inclining shaving effect with respect to the direction of rotation, and will also tend to propel frozen custard or the like in a forward direction. It is thus evident that'the scraper 49 which is but slightly curved out of parallel with shaft I9, is succeeded by a scraper42 which is more curved, while scraper 44 is given a greater curvature than either of the previous scrapers because the frozen material as it advances through the cylinder tends to be frozen to the walls of said cylinder in a condition of increasing 7 the arm 45 being secured to the same mounting member 42' as arm 43' supporting scraper 42 and disposed at an angle thereto, which may be less'than or about the first arm supporting each scraper being disposed in advance of the last arm supporting the preceding scraper in the series.

Upon the forward end'of the shaft is fixed an expelling device somewhat resembling a screw propeller generally indicated at 46 and provided The general profile of with spiral blades 41, 41. the forward portion of the expelling device is preferably conical and registers just short of contact with the conical interior of the discharging head 23 immediately within the bearing portion 26 which supports the outer end 43 of the shaft. The discharging head is formed with a downwardly extending portion 43 through which a discharging channel ill communicates with the interior of said head in order to allow the frozen custard or other material to issue from said discharging headunder the propelling action of the feeding shaft 19. In this description, it has of course, been taken for granted that the pipe coils l4 surrounding the cylinder and having connected thereto pipes l and 8 with the freezing unit 6 have been in full operation so that the freezing fluid has been circulating through said pipe coils so as to chill the cylinder.

charging head 23, the same is preferably allowed I to fall into container 5| while the frozen custard freezing unit 6, while said holder and its cooling coils are wrapped with mineral wool, felt or other heat insulating material 55 which is retainedin frozen condition for an indefinite period of time by reason of the cooling of said vessel by means of chilling coils 54.

Nevertheless, it may be observed that the length of shaft I9 is quite considerable between the bearings and 26 thereof, so that the strain 1 upon the shaft, intermediate the ends, caused by the scraping action particularly of scrapers 42 20 when, however, the frozen material issues from the channel 50 in projection 43 upon the disor medium through the pipe coils l4 surroimding cylinder [3 and the coils 54 about the receiving vessel 5| with the result that said cylinder, said holder, and the vessel are chilled to a suflicient and predetermined extent causing successful operation of the machine. ready been mentioned the freezing unit 6 may be electrically operated or operated fromany source of power, although this is not illustrated as being too conventional to require showing.

when the shaft I3 is in place and the discharging head 23 in position, it is but necessary to start the motor 22 or other drive to operate mechanism 2| and its shaft 64 which willthen cause shaft IS in cylinder l3 to rotate in continuous manner. Ifthen the freezing unit 6 is caused to start operation with the freezing medium circulating thru pipes I, 8, 3 and I0 and the supply tank 21 is in position upon brackets 23 with a sufficient supply of liquid custard or the like, it will merely be necessary to open control valve 32 to a predetermined extent to allow a measured, flow of liquid custard or the like from pipe 33 to descend into cup 34 and then thru aperture 35 into the interior of cylinder l3 where it will be beaten by the paddles 36, 31, 38,

and initially scraped by the scraper 40 and propelled forwardly and frozen upon the walls in the path of scraper 42 and scraped and propelled forwa'rdly by scraper 42 and to some extent also by bearing vanes 59, 60, BI, and further propelled and scraped forwardly by scraper 44 after which the frozen material will be urged out and expelled from discharging channel in discharging head 23 by the expelling device 46 so as to accumulate in the receiving vessel 5|. The operation if allowed'to proceed as just described,

' will be entirely continuous as long as a supply of and 44, will be considerable and to some extent unbalanced. In order to compensate for the wide draft and in order to center the shaft and prevent bending thereof and render the opera- 7 rear to the reducing gear mechanism 2 I, is preferably provided with a spider or other locking structure 82 adapted to positively engage with projections 63 of a short shaft 84 which actually extends beyond the rear bearing 20 into. the mechanism 2| so that it will be possible to withdraw shaft l3 forwardly from within the cylinder when the discharging head 23 has been released from the front of the machine by unscrewing the hand screws 24, 24 for the purpose of cleaning the interior of the cylinder and shaft. Although no mechanism is illustrated forthe freezing unit 6 in as much as the details are ,well known and form no part of the present invention per se, it is understood that the same may be of any type as long as it suffices to supfluid is flowing into the receiving cup 34 through the pipe 33 from supply tank ,21. When the requisite amount of frozen confection has been accumulated, it may be preferable to have'a plate or apron 52 above the holder 53, which might be 0 terminated then within the vessel 5|, or may simply terminate at its edge as preferred.

The material of which the various parts are made may be varied to suit circumstances; for example, the freezing coil l4 and 54 may be of copper or bronze, or the cylinder may be of steel or white bronze, or any other metal or allay, and the frame and main parts of the apparatus' may be of iron, or steel, or more or less conventional, except as otherwise specifically set forth herein. It is obvious that the shaft I9 and its appurtenances should be of steel in order to be suiliciently strong, due to the heavy strain imposed upon it. It may be noted that it is not always essential that the scrapers shall have a definite pitch or inclination with respect to the shaft, but it is important that they are at least out of line. l

Manifestly, variations of our invention may be resorted to within a wide scope, and parts ply a sufficient circulation of the freezing fluid may be modified or used without others,'as long as the machine conforms to the principles involved. i Having now fully described our invention, we claim,

1. An apparatus for continuously freezing ice creams, fluid custards and the like, comprising a fixed hollow cylinder, means for exteriorly cooling said cylinder to freeze the contents thereof, said cylinder having one end closed and being provided in the upper portion of the same As has alwith a receiving cup connected with the interior 'of said cylinder and also having at the other end a removable discharging head, a feed shaft rotatably disposed within the cylinder and connected through the closed end of the latter with an exterior power-drive, there being a bearing in said closed end for said shaft and said shaft having a hearing at the other end in said discharging head, at least one agitating means secured upon the feed shaft below the general position of said receiving cup for agitating fluid entering the cylindenfrom said cup, a scraper secured on said feed shaft in approximately the "same portion of the cylinder as said agitating means and having greater longitudinal extension than said latter means, and being further disposed at a different angular position with respect to the axis of the shaft than said means, there being also an opening in the discharging head allowing the rotation of the shaft to cause feeding of frozen mixture scraped by saidscraper from the walls of said cylinder out through said opening in said head to the exterior of the apparatus, there being also means for supplying liquid creams, custards and the like to said receiving cup, and at least one additional scraper secured on the feed shaft intermediate said first scraper and the discharging head and formedwith a definite screw'pitch in order to feed the frozen mixture forward from said agitating means and said first mentioned scraper toward the discharging head, and further means secured upon the shaft extending into said head for forcing the frozen material received from said additional scraper through the opening in said head.

2. An apparatus according to claim 1, wherein a further scraper having screw pitch is disposed intermediate the one additional scraper and the discharging head, each of the scrapers scraping an individual portion of the interior wall of the' cylinder and contributing to the feeding of the frozen material toward the discharging head.

aired on the feed sum intermediate said first I scraper and the discharging head and at a different angular position with respect to said axis than that of the first mentioned scraper so as to be out of line therewith for the purpose of feeding the frozen mixture forward from said agitating means and said first mentioned scraper toward the discharging head, and further means secured upon the shaft extending into said head for forcing the frozen material received from said additional scraper through the opening in said head.

4. An apparatus according to claim 3, wherein a further scraper is disposed intermediate the one additional scraper and the discharging head out of line with the first and additional scrapers each of said scrapers scraping upon an individual portion of the interior wall of the cylinder and contributing to the feeding of the frozen material toward the discharging head.

5. An apparatus for continuously freezing ice creams, fiuid custards and the like, comprising a fixed hollow cylinder, means for exteriorly cooling said cylinder to freeze the contents thereof, said cylinder having one end closed and being provided in the upper portion thereof with a receiving cup connected with the interior of said cylinder and also having at the other end a removablerdischarging head, a feed shaft rotatably disposed in said cylinder and connected through the closed end of the latter with an exterior power drive, there being a bearing in said closed end for said shaft and said shaft having a bearing at the other end in said discharging head, a plurality of radially disposed beating paddles secured upon the feed shaft below the general position of said receiving cup for agitating fiuid entering the cylinder from said cup, 'a scraper secured on said feed shaft in approximately the same portion of the cylinder as said beating paddles and having greater longitudinal extension than said paddles and also 3. An apparatus for continuously freezing ice creams, fluid custards and the like, comprising a fixed hollow cylinder, means for exterior]! cooling said cylinder to freeze the contents thereof. said cylinder having one end closed and being provided in the upper portion of the same with a receiving cup connected with the interior ,of said cylinder and also having at the other.

end a removable discharging head, a feed shaft rotatably disposed within the cylinder and connected through the closed end of the latter with an exterior power drive, there being a bearing in said closed end for said shaft and said shaft having a bearing at the other end in said discharging head, at least one agitating means 812-- cured upon the feed shaft below the general position of said receiving cup for agitating fluid entering the cylinder from said cup, a scraper secured on said feed shaft in approximately the same portion of the cylinder as said agitating means and having a greater longitudinal extension than said latter meals, and being further disposed at a diiferent angular position with respect to the axis of the shaft than said means, there being also an opening in the discharging headallowing the rotation of the shaft to cause feeding of frozen mixture scraped by said scraper from the walls of said cylinder out-through said opening in said head to the exterior of the appadisposed at a different angular position with. respect to the axis of the shaft than any of the paddles, a second scraper secured upon said shaft intermediate the ends. thereof and out of line .with the first mentioned scraper, a third scraper secured upon a forward portion of the same shaft out of line with the first and second scrapers. there being also a discharge opening in said discharging head, means for supplying liquid creams. custards and the like to said receiving cup, and a discharging feed screw mounted upon the forward portion of the feed shaft forwardly of the third scraper and extending into the discharging head for forcing the frozen material 'from the three scrapers out through the discharge opening in said discharging head upon rotation of said feed shaft.

6. An apparatus according to claim 5, wherein the discharging head is interiorly concave in the direction facing the interior of the cylinder so as to accommodate the feed, screw, and the said feed screw has a generally convex profile lathe forward direction to correspond to the concavity of said discharging head.

'1. 'An apparatus according to claim 5, wherein a plurality of radially disposed bearing members are secured to the feed shaft intermediate the ends thereof and which tend to bear against the inner wallof the cylinder in order to support said shaft and resist. the strain imposed thereon ratus, there being also-means for supplying liquid creams, custards and the like to said receivin; cup. and at least oneadditional scraper by operation of the scrapers.

8. An apparatus according to claim 5, wherein a plurality of radially bearing plates are secured to the feed shaft intermediate the ends thereof and generally pitched in the same feeding direction as the discharging feed screw, said bearing plates tending .to bear against the inner wall of the cylinder so as to resist the strain imposed upon said shaft by the operation of the scrapers and to assist in propelling the frozen -m aterial within the cylinder due to their forward pitch.

9. An apparatus according to claim 5, wherein the first mentioned scraper upon the feed shaft is slightly pitched in the forward feeding direction so as to be nearly perpendicular with the axis of the shaft, and wherein the second scraper is provided with an increased pitch in the same feeding direction as that of the discharging feed screw and wherein. the thirdscraper has an even greater and more emphasized pitch in the same v feeding forward direction.

10. An' apparatus according to claim 5, wherein the three scrapers are located in three continuous and successive freezing zones in the cylinder, the first zone being .a preliminary chilling zone in which the first scraper operate adjacent to the receiving cup, the second zone being a positive freezing zone in which the second scraper operates, and the third zone being a'hard freezing andfflnishing zone in which the third scraper. operates in proximity to the forward end of the cylinder, said zones being disposed in, line and forrriing continuous portions of the interior of the cylinder and'having the same general diameter throughout.

11. An apparatus according to claim 3, wherein a further scraper is disposed intermediate the one additional scraper and the discharging head, and the three scrapers are disposed out-of line with respect to each other and individually in different'angular positions with respect to the axis of theshaft, each of the scrapers scraping upon an individual portion of the interior wall of the cylinder and contributing to the feeding of the frozen material toward the discharging head, and by virtue of the individual radial position thereof also distributing the strains imposed upon said shaft by the scraping action of each scraper, and wherein the shaft has a discharging feed screw at the forward end cooperating with one agitating means mounted upon the feed shaft in proximity to the general location of said receiving cup for agitating fluid entering the cylinder from said ,cup, a scraper, a scraper arm mounting fixed upon and surrounding the shaft between the driven end thereof adjacent the power drive and the agitating means and rigidly carrying a scraper arm for supporting one end portion of said scraper, a second scraper arm mounting fixed upon and surrounding said shaft between the agitating means and the discharging head or forward end of said shaft and rigidly carrying a second scraper arm for supporting the other end of said scraper, a second scraper, a third scraper arm rigidly carried by said second scraper arm mounting for supporting one end portion of said second scraper, said third scraper arm being disposed at an angle to the second scraper arm, and a third scraper arm mounting fixed upon and surrounding said shaft between the second scraper arm mounting and said forward end of the shaft and rigidly carrying a fourth scraper arm for supporting the other end portion of said second scraper, said th'irdand fourth scraper arms supporting said second scraper out of line with respect to said first scraper.

14. Apparatus according to claim 13, wherein the second and third scraper arms which are dis- I posed at an angle with each other are also disposed in substantially the same transverse plane with respect to the axis of the shaft, and each scraper arm mounting comprises a ring or collar upon the shaft having the scraper arms substantially integral therewith.

15. Apparatus according to claim 13, wherein each scraper arm mounting comprises a ring or collar upon the shaft, the several collars forming the 'scraper arm mountings being spaced apart in p a series along the shaft.

the discharging head so as to force frozen material out through the of said shaft with its scrapers.

12. An apparatus'according to claim 3., wherein the further means securedupon the shaft ex- Atendin'g into the discharging head comprises a feed screw of generally convex profile, the discharging head having a corresponding concave portion to receive said feed screw, and wherein said discharging head has a flange adjoining said concave portion-for the purpose of fastening onto the open end of the cylinder in order to center said head in position upon said end.

13. An apparatus for continuously freezing ice creams, fluid custards and the like, comprising a fixed hollow cylinder, means for exterioriy cool ing said cylinder to freeze the contents thereof, there being means closing one end of the cylinder discharging opening therein from within the cylinder upon rotation (all and a receiving cup upon the latter communicating with the interior of the cylinder, said cylinder having at the other end thereof a rcmovabledischarging head, a feed shaft adapted to be rotatably disposed within the cylinder and connected through said first one end with for power drive for rotating the same, t e "11+ also a bearing in the same one end for n. r

16. Apparatus according to claim 13, wherein a further or fourth scraper arm mounting is fixed upon and surrounds the feed shaft between the third scraper arm mounting and the forward end of said shaft, and a third scraper is included, while a fifth scraper arm is rigidly carried by the third scraper arm mounting for supporting one end portion of said third scraper in addition to the fourth scraper arm also carried by said scraper arm mounting, and wherein the fourth scraper-arm mounting upon and surrounds the shaft between the third scraper arm mounting and the forward end of said shaft rigidly carries a sixth scraper arm for supporting the other end portion of said third scraper, and said fifth and sixth scraper arms support said thirdscraper out of line with respect to'thesecond scraper,

1'7. An apparatus for continuously freezing ice creams, fluid custards and the like, having a feed shaft or dasher, including a shaft proper, at least three scraper arm mountings fixed upon and surrounding said shaft in a spaced series, an agitating means fixed upon the shaft between the first and second scraper arm mountings, at least two scrapers, .a scraper arm rigidly carried by first and third scraper'arm mountings for sun th third scraper is disposed in advance of the second scraper arm supported on the same member or mounting therewith, so as to cause the second scraper to be disposed anguiarly in advance of the first scraper.

19. Apparatus according to claim 13, including additional scraper arms supported in fixed positions upon the shaft intermediate the first and scraper in common with the two scraper arms second scraper arms on the one hand, and inter'-' mediate the third and fourth scraper arms on the other 'hand, the third and fourth scraper,

arms with the intermediate scraper arm therebetween all being individually disposed angularly in advance of the first and second scraper arms and the scraper arm between the latter two.

20. Apparatus according to claim 13,including additional scraper arms having scraper arm mountings supporting the same and fixed individually in predetermined positions upon the shaft intermediate the first and second scraper arms on the one hand, and intermediate the third and fourth scraper arms on the other hand,

the third and fourth scraper arms with the in termediate scraper arm therebetween all being individually disposed angularly in advance of the firstand second scraper arms and the intermediate scraper arm between the latter two, and the intermediately disposed additional scraper arms serving in each case to support the same between which said additional scraper arms are individually located. t

21. Apparatus according to claim 13, having a further or fourth scraper arm mounting fixedly surrounding the feed shaft between the third scraper arm mounting and the forward end of said feed shaft, a third scraper, a fifth scraper.

' arm also rigidly disposed upon said third scraper. arm mounting in addition to the fourth scraper I arm and serving to support one'end portion of said third scraper, a sixth scraper arm rigidly disposed upon said fourth scraper arm mounting for supporting the other end portion of said thirdscraper, the third scraperarm being disposed angularly in advanceof the second scraper arm supported on the same scraper-arm mounting therewith, whilethe fifth scraper arm I i also disposed angularly in advance of the Q fourth scraper arm supported on the same scraper arm mounting with said fifth scraper arm, so that the third scraper is carried on its supporting arms angula'rly in advance of the sec- I on'd scraper and said second scraper is in'tur'n carried on its supportingarrns angularly in ad- Vance of the first scraper.

ERICK SPELLMAN.

CHARLES? ERICK-SON. g

Images