US726726A - Beating-engine. - Google Patents

Description

PATENTED APP.. 2-8, '1190s.

M. A. MILLS. BEATING ENGINE.

APPLIGATION FILED AUG. 2, 1901.

N0 MODEL.

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PATENTED APR. 28, 1903.

M. A. MILLS'.

BBATING ENGINE.

APPLICATION FILED AUG, 2, 1901.

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NO MODEL.

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PATENTED APR 28, 1903.

M. A. MILLS.

BEATING ENGINE. AAPPLIGATION FILED AUG. 2, '1901.

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N0 MODEL.

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PATENTED APR. 28, 1903.

M. A. MILLS. BEATINC. ENGINE.

APPLICATION lFILED AUG. 2, 1901.

N0 MODEL.

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NE NORHIS PEYERG CO., PHOTULIYNU.. \V'\SH1N 0N C "UNITED STATES,N

VAT1-IT FFICE.

MnLvIN AfMlLLs, on LAWRENCE, MASSACHUSETTS.

BEATlNe-E'NGINE PECIFICATION`formng part of Letters Patent No. 726,726, dated April 28, 1903-.

y Application led August 2, 1901.l Serial No. 70,637. (No model) To @ZZ wil/071e tammy concern:

Be it known that I, MELVIN A. MILLS, a citizen of the United States, residing at Lawrence, in the county of Essex and State of Massachusetts, have invented an Improvement in `Beating-Engines,of which the following description, in connection with the accompanying drawings, isa specification, like characters on thepdrawings representing like parts.

This invention relates to what are known as beating-engines, which are used for disintegrating and mixing the material for the preparation of paper-stock; and it is the object of my invention to provide an engine which is capable ofv taking care of an in.- creased amount of stock and which requires a less expenditure of power than beating-engines as commonly constructed.

In one familiar type of beating-engines the pulp-tub is divided by a mid-feather into two parallel circulating-channels, and in one of said channels is the beating-roll having disintegrating-blades on its periphery which cooperate with. a bed-plate in the bottom of the channel. These rolls are commonly mounted on shafts which are supported above the pulptub, so that only the lower half of the roll is immersed in the stock, and'to provide for the proper circulation of the stock a backfall is placed in the channel immediately adjacent the delivery Yside of the roll, said backfall coming nearly to the top of the channel. The stock asit is disintegrated between the blades and the bed-plate is carried by the blades and deliveredover the top of the backfall and is then acted on by gravity and carried around the circulating-channel to the feed side of the roll. In this type of engine the friction` between the blades and the bed-plate creates a resistance to the rotation of the roll, which resisting force is applied at the end of the radius of the roll, and because the lroll is of such a large diameter' the lever-arm of this resisting force iscorrespondingly long, and a correspondingly great power is necessary `to overcome the same. Furthermore, added power is necessary to lift the stock over the backfall, such lifting force also being applied at the periphery of the roll. It will be obvious that if the roll were made smaller the lever-arm of the resisting force ledge of the disintegrating-blades.

would be correspondingly shortened, and less power would consequently. be required to drive the roll. Accordingly I propose to embody in a beating-engine of any type-that is, with any practical arrangement of circulating-channels-a beating-roll of comparatively small diameter to replace the large roll heretofore used, thereby obviating all of the objections as to power, friction, dto., which result from the use of a large roll. order to obtain good circulation of the stock, I have omitted the backfall entirely and have provided means wherebyv the stock is delivered horizontally from the bottom' of the roll, said means comprising a hood covering the roll and-forming with the bottom of the channel a substantially horizontal feed-passage, through which the stock is fed to the roll, and a substantially horizontal deliverypassage, through which the stock is delivered from the roll, This construction obviates the necessity of lifting the stock over the backfall by the roll. The hood extends some distance below the center of the roll at the delivery side thereof and comes close to the outer When now the roll is rotated rapidly to acquire the proper surface speed, the stock is drawn through the feeding-mouth by suction and delivered through the diverging delivery The Preferably 1 will employ two rolls, one in each channel, and the shafts supporting Vthe rolls will extend clear across the pulp-tub, the shaft for one roll'passing through the other channel' between the hood and the inclined wing at the delivery side thereof, this' construction serving to prevent-the stock from coming in contact with the shaft.

Various other features of myimproved beating-engine will be hereinafter described, and pointed out in the claims.

Figure 1 illustrates a side elevation of my improved engine. Fig. 2 is a longitudinal vertical section thereof through one of the circulatingchannels. Fig. 3 is a top plan View. Fig. 4 shows a slightly-modified form of engine. Fig. 5 illustrates in detail the construction of my improved beatingeroll. Fig. 6 is a vertical section of one side of the pulp-tub and shows the manner of vertically adjusting the rolls. Fig. 7 is a section on the line 7 7, Fig. 6. Figs. 8 and 9 are details showing dierent ways of preventing the stock from leaking around the shaft as it passes through the wall of the pulp-tub, and Fig. 10 is a view of my improved roll.

In Figs. 1 and 2 the pulp-tub is designated by 3, and it may be of any suitable shape or construction and is provided with the usual mid-feather 4, which divides the tub into the two circulating-channels 5 and 5'. Extending transversely across the tub and passing through suitable slots 7' in the side walls of the tub is the shaft 8, carrying the beatingroll 9, saidroll being situated in one of the circulating-channels and having on its periphery blades 10, which cooperate with a bed-plate 1l of any suitable construction, situated in the bottom of the channel. The shaft 8 is supported in suitable bearings 19', which are vertically adjustable, as will be presently described. As seen in Fig. 2, the diameter of the beating-roll 9 is less than the depth of the channel, so that said beating-roll is entirely received by the channel. Extending entirely across the channel, between the mid-feather 4 and the side wall 4', and covering the upper portion of the roll, isa hood or bonnet 15 of a substantially semicircular shape, as shown in Fig. 2, the lower portion 16 of the bonnet at the delivery side of the roll being preferably shaped to fit and situated close to the ends of the blades in the roll, (see Fig. while the lower portion of the bonnet at the feeding side thereof may be situated some distance from the roll. Extending from the lower portion of the roll on either side thereof are upwardly-inclined wings 17 and 18, the wings 17 at the delivery side of the roll being stationary and being connected at its lower end to the lower point of the bonnet at 19. The Wings 17 and 18 form with the bottom of the Achannel a feeding mouth or passage 2O and a delivery mouth or passage 21, the said feeding-passage being converging, as shown,while the delivery-passage is preferably adiverging passage. Vith lhis construction it will be seen that as thc roll is rotated to give the proper surface speed the stock will be freely drawn through the inlet or feed passage 2O by the action of the blades, and because themeeting edge 19, between the wing 17 and the bonnet, is closely adjacent the .blades the stock is deflected from the roll and is delivered into the discharge-mouth 21, the lower portion 16 of the bonnet preventing any amount of stock from being carried over the roll by the blades.

That portion 13 of the bottom of the channel in front of and adjacent the bed-plate I have termed a feed-apron, and the portion 14C of the bottom of the channel directly back of the feed-plate and over which the stock passes as it is delivered from the roll I have termed the delivery-apron.

I will preferably so construct myfeed-apron 13 and the delivery-apron 14 that they extend in a substantially horizontal direction, as shown, thereby omitting entirely the usual backfall, and when the aprons are constructed in this manner the hood and wings will be so shaped that the meeting edges between the hood and wing on each side of the roll are some distance below the center of the roll, whereby the stock is fed to and delivered from the roll in a substantially horizontal direction.

Since the stock does not have to be lifted over the backfall by the roll, as in the ordinary beating-engine, but is instead drawn through the feed-passage 20 and delivered in a straight line through the delivery-pas sage 21 by the rotation of the roll, my construction of beating-engine does not necessitate the expenditure of the power necessary to thus lift the stock over the backfall.

From the above it will be seen that my beating-roll is of such a size and so situated in the channel as to be substantiallysubmerged in the stock. This feature of employing a submerged beating-roll, which is situated entirely within the channel in which it operates, and the omission of the usual backfall, thus obviating the necessity of lifting the stock by the roller, I consider as one of theilnportant features of my invention, for the reason that l am enabled to obtain perfect circulation and disintegration of `the stock with a minimum expenditure of power.

Since the stock is delivered from the roll in a substantially horizontal direction near the bottom of the channel, the stock is kept agitated and is prevented from becoming clogged, as it frequently does where it is delivered over the backiall and at the top of the channel instead of the bottom thereof. This agitation of the stock may be augmented by providing the channel at the delivery side of the roll with the scalloped port-ions or rifties 23, such scallops or concavities as the stock is delivered thereover serving to give the same a sort of boiling action. These rif fies may be placed either in the end of the apron 14 or partially in the apron and partially in the bed of the channel, as deemed best.

Preferably the delivery-passage 21 is provided with a parting-blade GO, the point of which comes, as shown, close to the periphery of the roll, such parting-blade dividing the delivery-passage into two channels and serving to part the stock delivered, whereby it is still further agitated and mixed. The parting-blade 60, however, may be omitted, if desired.

IOO

I will preferably make the feed-apron 13 convex at its end and slightly concave as it approaches the bed-plate 11, as seen best in Fig. 2, and will give to the curved side 18' of the wing 18 such ashape that the central line of the converging feed-passage 2O is slightly inclined to the horizontal, this construction being found advantageous, because it allows the stock to be fed with greater facility, the converging shape of the feed-passage allowing the stock to be delivered to the roll without any clogging.

To regulate the amount of stock fed to the roll, I may, if desired, make my wing 18 at the` feeding side of the roll in the form of a vertically-adjustable gate, which may be raised or lowered to admit more -or less stock, as' de# sired. I have illustrated in Fig. 2 one convenient form of gate, which is shown as be# ing hollow and as having the curved side 18', which forms with the feeding-apron the delivery-mouth. The back side of the gate may be mounted to slide in suitable ways 24: on the mid-feather 4 and the side walls of the tub, respectively, and any suitable means may be employed for holding the gate inits adjusted position. be provided with suitable handles 25, by means of which it may be raised or lowered. By making the gate hollow, as illustrated, it is sufficiently buoyant so that even though it is made of iron it may be of substantially the same specific gravity as the stock in the channel, thus obviating the necessity of any counterbalancing means therefor.

My roll is preferably constructed as shown in Figs. 5 and 10, it presenting a solid core of metal havingintegral therewith the shaft ceived, and said blade being held in place'by any suitable means, such as tapering pins 29, which Aare driven through inclined aperi tures through the rib and blade, as seen inblades.

do away with the necessityof employing wooden bars, between which theblades are clamped, as is the common construction, and Iam enabled to use a blade of less width than can commonly be employed. Moreover, the metal ribs 27 form firm supports'forthe The roll will have any suitable number of blades, and between the ribs which support the blades the surfaceV of the roll is grooved, as at l28, said grooves being substantially U shape in cross section. This construction not only-affordsameans for firmly holding the blades in position, but

Preferably the gate will ing the blades as long as would be the case I if the periphery of the roll were not grooved.

Since the blades I employ may be narrower than is commonly used, I may make them also thinner without in anyway rendering them less rigid or inflexible, thereby reducing the cost of the blades, which is .quite an item iu a machine of this type. the blades are of a uniform thickness, as illustrated.

I The purpose in making t-he grooves 28 substantially U-shaped is to'avoid the presence of any sharpcorners between the blades, into which the stock may become lodged.

One convenient way to make my rollis to make a casting of the proper shape, said casting including the cylindrical portion for the shaft 8 and the large'cylindrical portion for the roll 9, and then planing out the grooves 28A in a surface of the roll, to thereby leave the ribs 27. The ribs may then b e grooved and bored for the reception of the disintegrating-blades. To prevent the blades from chattering they are preferably inclined somewhat to the radial line, as show-nin Fig. 5,-su'ch inclination being accomplished yby making each blade parallel to a radial linea slightdis# tance back of the blade', as seen in Fig. 5, the bla'de ot in said figure, for instance, being parallel to the dotted radial line b.'

Where the stock isv caused to circulate by suction, as in this device', more or less of 'a vacuum is created between the blades in drawingstock through the feeding-passage, and unless said vacuum is destroyed it would be inclined to hold the'stock between the blades, and thus carry the same over the roll. To prevent this, I may, if desired, provide some means for admitting air between Nthe blades of the roll, one convenient means for accomplishing this being to make the shaft hollow, as seen inFig. 4,'and`to provide a series of radial air-ducts 80,'extending from said hollow shaft to the'grooves 28 between the blades, such air-ducts admitting the air to the grooves 28, and thus destroying any vacuum which may beformed. vIl have three or more such air-ducts leading to each groove,

Preferably TIO accordingto the length of the roll. As'w'ear occurs between the roll and the bed-plate it isnecessary to adjust the'roll `closer to the bed-plate, and I therefore mount my shaft y8 in vertically-adjustable bearings 19', which'f suspended from the yoke. fThe bearing at each end of the shaft is supported in' a similar manner, and to adjust the same simultaneously, so as to always maintain the rollin horizontal position, a shaft 34 extends across the tub and has thereon at each end bevelgears 35, meshing with the bevel-gears 32, said shaft being supported in suitable bearings 37 and being operated by a suitable handwheel 36. By turning the hand-wheel 3G in either direction both ends of the shaft 8 will be simultaneously raised or lowered, as will be obvious. Since the shaft projects through the slot 7 in the side walls of the tub, it is necessary to provide some means to prevent the stock from leaking around the shaft, and this may bel conveniently accomplished as illustrated in Figs. 8 and 9, wherein the stuffing-box 40, through which the shaft S passes and which is slidably mounted in the slot 7', is provided with the extended iiange 4l,which is seated in asuitable recess in the side walls of the tub. If the side walls of the tub are of iron, I may provide a vertically-extending recess 42 on the. inner face thereof, said recess being provided with vertically-extending grooves which tit corresponding verticallyextending ribs 43 on the flange 4l. This construction allows the stuffing-box 40 to be raised or lowered; but the zigzag line of contact between the iiange 4l and the inside of the box prevents any stock from leaking through, for owing to the consistency of the stock it cannot work past the ribs and grooves.

Where the ilangeel is on the inside of the wall of the tub, as in Fig. 8, I rely upon the pressure of the pulp to hold it in place; but I may, if desired, tap the holding-bolts 44 into the ange 4l, said bolts passing through a suitable slot elin the side walls of the tub, and provide said bolts with a suitable spring 4G, which bears against the head of the same and against the tub, said springs and bolts operating to yieldingly hold the stui'iing-box in place, but to allow it to be vertically adjusted.

In Fig. 9 I have shown a modified construction wherein the stufiing-box 40 is provided with the extended wings 4l', .which set in grooves centrally arranged in the side walls of the tub, the said flanges and grooves being ribbed, as in the other construction.

It will be understood, of course, that when the construction shown in Fig. 9 is employed the slot 7' in the side of the pulp-tub, through which the stuffing-box for the shaft projects, will extend clear to the top of the tub.

In one embodiment of my invention I will employ two disintegrating-rolls, there being one such roll in each of the circulating-channels, and, as illustrated in Figs. 2 and 3, the shafts for the rolls will be situated in the same horizontal plane and will be so placed that the shaft 8 of the roll in the channel 5 will pass through the channel 5 between the hood and the wing 17, as seen in Fig. 2. By this construction the stock is prevented from contacting with the shaft of the roll.

Preferably the two rolls will be driven from the same driving mechanism and each shaft will have on the end thereof suitable gears 48, which mesh with each other, one of said gears being connected to and driven bya suiti able driving-pulley 49. By this system of gears the shafts are rotated in opposite directions, but in the appropriate directions to cause the stock to circulate, as indicated by the arrows in Fig. 3.

By using two rolls in the same tub the stock may be disintegrated more rapidly than where one roll is used, and because of my peculiar construction less power is expended in driving the engine. Moreover, because the rolls employed are comparatively small sufficient space is afforded in each of the channels so that, if desired, a washing-cylinder may be placed therein, which construction would not be possible where the rolls are of the large diameter without unduly increasing the size of the pulptub.

Another advantage which I obtain by em ploying two heating-rolls is that my beatingengine becomes a universal engine-e'. e., it may be fed from either direction--and it is not necessary, therefore, to make the engines either righthand or left-hand engines, according to the space in which they are used, as is the case with the present existing styles of engines.

In Fig. 4 I have illustrated a slightly-modified form of engine wherein the mid-feather 4 is horizontally arranged, thus dividing the ICO tub into two circulating-channels 5 and 5b,

which are arranged one above the other. In other respects, however, the apparatus is the same as that in the other views, and I employ the roll of less diameter than the depth of the channel and use a hood device, as in my former modification.

Although I have herein illustrated my comparatively small beating-roll as situated en tirely in the circulatingchannel-that is, with no portion thereof projectingabove the channel-yet I do not desire to be limited to this precise arrangement, as my broad invention would not he departed from if a roll of small diameter were so placed in the channel that a portion thereof extended above the top of the mid-feather or if in conjunction with any roll operating in said channel a hood was used which covered the upper portion of the roll and formed, with the bottom of the channel, a substantially horizontal delivery-passage, so that the stock would be delivered from the bottom of the roll in a substantially horizontal direction, and therefore although I have herein shown the best form now known to me of embodying my invention, yet I wish it understood that the details thereof may be Varied in many particulars without departing from the spirit and scope of my invention as expressed in the following claims.

Having fully described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

l. In abeating-engine, a pulp-tub having a IIO longitudinally extending circulating channel, a disintegrating-roll situated entirely within said channel intermediate its ends, and means to direct the entire quantity of stock beneath the roll, said roll having a horizontal discharge at the bottomof the channel.

2. In a beating-engine, a pulp-tub having a substan tially flat botto ni circulating-channel, a disintegrating roll situated within said channel intermediate its ends, said roll being of such size that its axis is below the normal level'of the stock in the channel, a feed-pasi sage through which the stock is fed to t-he roll, and a delivery-passage through which the stock is delivered from theroll, said deliv ery-passage having a horizontal direction and being situated at the bottom of the channel.'

3. In a beating-engine,a pulp-tub having a vertical mid-feather dividing the tub into two circulating-channels, the bottom of each of said channels being substantially dat, a disintegrating-roll situated entirely within one of said channels intermediate its ends, and a hood covering the upperportion of the roll and forming with the fiat bot-tom of the channel passages to feed the stock to and deliver it from the roll in a substantially horizontal direction. 1

4; In a beating-engine, a pulp-tub having a circulating-channel, aV disintegrating-roll operating in said channel, a hood covering 1the upper portion of the roll and'forming with vthe bottom of the channel a substantially horizontal delivery-passage whereby the stock is delivered from the bottoml of the roll in a substantially horizontal direction. 1`

5. In a beating-engine, a pulp-tub having a substantially flat bottom, and provided with a vertical mid-feather dividing the tub into two circulating-channels, a disintegratingroll situated entirely within one of said channels intermediate its ends, a horizontally-arranged feed-passage'through which the stock is fed to the roll, and a horizontally-arranged delivery-passage through which the stock is delivered from the roll. i

6. In a beating-engine, a pulp-tub having a mid-feather dividing the tub into two circu lating-channels, a disintegrating-roll situated entirely in one of said channels intermediate the ends of the latter, said roll being of such a size as to be below the normal level of the stock in the channel, and a hood covering the upper portion of the roll and forming with the bottom of the channel passages to feed the stock to and deliver it from the bot-- tom of the roll 'in a substantially horizontal direction.

7. In a beating-engine, a pulp-tub having substantially fiat-bottomed circulating-chan-4 nels communicating with each other, a disf integrating-roll in each channel between its ends, a hood covering the upper portion of each roll, said hoods forming with the bottoms of the circulating-channelsv substan tially horizontal delivery-passages for the stock, whereby the stock is delivered from the bottom of each roll in a substantially horizontal direction.

8. Inabeating-engine,apulp-tubhavinga 7o said channels and being situated in diiferent channels, a hood covering the upper portion of 'each roll and having an upwardly-inclined i wing extended from the bottom thereof at the delivery side of `the roll, the shafts being S0, situated relative to each other that each kshaft passes throughfthelspace betweenthe'hoo and the wing ot" iheroll on the other shaft, i whereby the shafts are protected from contactr with the stock.

9. In a beating-engine, a pulp-tub having a vertical mid-feather dividing the tub into two circulating-channels, a bed-plate in each channel,A the hott-om'ot' said channels extending back from said bed-plates in a substantially horizontal direction, two shafts extending across the tub below the normal level of the stock in said channels, a disintegratingroll on each shaft, one roll being situated in veach channel, and means to direct all of the stock under each ot' said rolls, said stock being delivered from the rolls in a subst-antially horizont-al direction. I

10. In a beating-engine, a pulp-tub havingI a circulating-channel, a disintegrating-roll situated in said channel, a hood extending across saidchannel and covering the upper vportion of the roll, said hood having inclined win gs extending upwardly from the lowerportion thereof to forin'with the bottom of the channel a converging feed and a horizontal diverging deliverypassage for the stock.

' 11. In a beating-engine, a pulp-tub'having a circulating-channel therein, a'disintegrating-roll situated entirely in said channel, said roll being so situated and being of such a size as to be below the level ot' the stock, a hood 'extending across the channal and covering the upper portion of the roll, the lower portion of said'hood coming close to the periphery ofthe roll on the delivery side thereof and extending below the center of the roll, and an upwardly-inclined wing connectedto the hood to form a diverging delivery-passage for the stock. l l.

l2. vIn, a beating-engine, a pulp-tub having a substantially iiat bottomed circulatingchannel, a disintegrating roll situated entirely in said channel, a hood covering said roll and extending below the center thereof, and an upwardly-inclined Wing connected to the lower portion of the hood on the delivery side ofthe roll, such lower portion of the hood being situated close to the periphery of lthe roll whereby stock is prevented from being` carried over the roll.

13. In a beating-engine, a pulp-tub having a circulating-channel, a disintegrating-roll in said channel, a hood extending across the channel and covering the roll, an upwardly- IOO IOS

inclined wing connected to the hood at the delivery side of the roll and forming a diverging discharge-passage for the stock, and a parting-blade in said dischargepassage.

14. In a beating-engine, a pulp-tub having a flat-bottomed circulating-channel, a disintegrating-roll in said channel, said roll being of such a size and so situated as to be below the level of the stock in the channel, a hood covering the upper portion of said roll, the lower portion of said hood at the delivery side of the roll being situated close to the periphery of the roll, and on the feed side of the roll being spaced from theroll.

15. In a beating-engine, a pulp-tub having a circulating-channel, a disintegrating-roll situated entirely within the said channel, a bed-plate in the bottom of the channel intermediate its ends, the bottom of the channel extending backwardly from the plate in a substantiallyhorizontal direction, and a hood covering the roll and forming with the channel bottom feed and delivery passages for the stock, the roll being of such a size that its axis is situated below the level of the stock.

16. In a beating-engine, a pulp-tub having a circulating-channel, a disintegrating-roll in said channel, a bed-plate in the bottom of the channel intermediate its ends, a deliveryapron forming part of the bottom of the channel and extending back from the bed-plate in a substantially horizontal direction, and a hood covering said roll and forming with the channel bottom feed and delivery passages for the stock, the roll being of such a size that its axis is situated below the level of the stock, and the stock in its circulation all passing beneath the hood.

17. In a beating-engine, a pulp-tub having a. substantially dat bottomed circulatingchannel, a disin tegrating-roll in said channel, a hood covering the upper portion of the roll and extending below the center thereof, upwardly-inclined wings connected to the lower .portion of the hood at each side thereof, a bed-plate and delivery and feed aprons extending therefrom in an approximately horizontal direction, said aprons and wings forming a converging feed and a diverging delivery passage, and means to rotate the roll whereby the stock is drawn through the roll by suction. v

18. In a beatingengi'ne, a pulp-tub having a circulating-channel, a disintegrating-roll in said channel, a hood covering the upper portion of the roll and extending below the center thereof, upwardly -inclined wings connected to the lower portion of the hood at each side thereof, a bed-plate, and delivery and feed aprons extended therefrom in an approximatel y horizontal direction, said aprons and wings forming a converging feed and a diverging delivery passage, the wing at the feed side of the roll being vertically adjustable to regulate the feed of the stock, and

stnftin g-boxes in said slots and through which the shaft passes, said stufng-boxes each having a ange projecting therefrom which is received in a recess in the walls of the tub, vertical ribs on said anges, and corresponding grooves in said recesses, whereby the stock is prevented from leaking.

21. In a bcating-engine,apulptub having a mid-feather dividing the tub into two circulating-channels having bed-plates, the bottom of said channels extending back from said bed-plates in a substantially horizontal direction, a pair of shafts extending horizontally across the tub and projecting outside thereof, a disintegrating-roll on each shaft, said rolls being in different channels and each of said rolls being of such a size and so situated in its channel as to be below the level of the stock, gearing con necting said shafts together whereby they may be rotated in unison, and means to direct the stock beneath the rolls.

22. In a beating-engine, a pulp-tub having a mid-feather dividing the tub into two circulating-channels, a pair of shafts extending horizontally across the tub and proj ecting ontside thereof, a disintegrating-roll on each shaft, said rolls being in different channels, and gears on said shafts outside the tub and meshing with each other, whereby the rolls may be rotated in unison and in opposite directions.

23. In a beating-engine, a pulp-tub having a mid-feather dividing the tub into two circulating-channels, a pair of shafts extending horizon tallyacross the tub and projecting outside thereof, a disintegrating roll on each shaft, said rolls being situated in dierent channels and each being of a diameter less than the depth of the channel, gears on said shafts outside the tub, said gears meshing with each other, and means to rotate one of said gears whereby the rolls are rotated in unison and in opposite directions.

24. In a beating-engine, a pulp-tub having a circulatingchannel, a disintegrating-roll therein, and means to direct the stock beneath the roll, said roll having blades on its periphery and means to admit air between said blades whereby the stock is freely de livered.

25. In a beating-engine, a pulptub, a disintegratin g-roll,abedplate coperatin g there IOO IIO

IZO

with, a delivery-apron extending from the bed-plate in a substantially horizontal direc` tion, a hood covering said roll and provided with an upwardly-inclined wing to form with the delivery-apron a diverging discharge-passage, and means to admit air between the blades of the roll wherebythe stock is freely delivered.

26. A roll for a beating-engine, presenting a cylindrical body of metal having longitudi-V nal grooved metallic ribs on its periphery, disintegrating-blades set into said grooves, and pins extending diagonally through the ribs and blades and serving to hold said blades in place.

27. A roll for a beating-engine presen-ting a cylindrical metallic body provided on its surface with ribs extending longitudinally thereof, said ribs being grooved and disintegrating-blades secured in said grooves.

28. A roll for a beating-engine, comprising a body portion formed from a single piece of metal, and disintegrating-blades secured to said channel, a diverging delivery-passagethrough which the stock is delivered from the roll and a horizontally-arranged partin g-bl ade extending across the delivery-passageanddividing the same into two channels.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MELVIN A. MILLS.

Witnesses:

LoUIs C. SMITH, JOHN C. EDWARDS.

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