US1171143A - Drier. - Google Patents

Description

w. B. RuGLEs. DRIER. APPLlcTIoN man :un: n, 1909. 1,171,143. Patented Feb. 8,1916.

www fm W. B. RUGGLES.

` DRIER. APPLICATION FILED .IUNE 11,. 1909.

Patented Feb'. s,

3 SHEETS-SHEETZ.

WITNESSES:

- w. BQRUGGLES.

DRIER.

APPLICATION nl .ED :UNE 11. 1909.

[ETS-SHEET 3.

mmm'.

DRIER.

Specification of Letters Patent. v

Application iled June 11, Serial No. 501,453.

To all whom 'it may concer-n;

'Be it known that I, WILLIAM B. RUG` a citizen of the United States, resid- GLEs' 7 in the county of Hudson ing at Bayonne,

and State of New Jersey, have invented certain new and usefullmprovements Driers, of which the followingis a full, clear, and eXact description, such` as will enable others skilled in the artto which it app'ertains to.'

make and use the same. l

This invention relates to driers and with Aregard to the more specific vfeatures to that style of apparatus in which the material to be dried does not come in direct contact with the heating medium.

One of the objects of the invention is to provide a drying apparatus of the above general character which will be practical,y simple inconstruction, comparatively cheap to manufacture and highly eiiicient in operation. y Another objectof the invention is to provide a drying apparatus with suitable, 1m-

-proved means for conveying the heating medium through the apparatus, land means for holding the conveying means in place.'

Another object of the invention is to prol vide a drying apparatus with` suitable means for withdrawing the steam and moisture given off by the material to be dried during the drying operation. l'

Another object of the invention is to provide a vdrier withsuitable means 'for conveying the material to be dried well into the drying chamber, and prevent the same from spilling out the front end thereof.

Another object of the invention .is to provide a drying apparatus'with means for receiving andcollecting the material after the same is dried.

Another object of the invention is to provide a drier of the above character with means whereby a more perfect combustion of the heating medium will take place as the same passes through the drier. n

Other objectswill be in, part obvious and,

in part pointed out hereinafter.

The invention accordingly consists in thev features of construction, combinations of elements and arrangement of `parts which will be exemplified. in the construction hereinafter set forth, and the scope of the application' of which will be indicated in the following claims. A A

In the accompanying drawings wherein is shown two of various possible embodiments ofthe invention; Figure l is a side elevation of one complete form of drying apparatus showing certain details and concealed parts in dotted lines and broken away portions. Fig. 2 is a plan view. of the same. Fig. 3 is a vertical sectional view showing certain details. Fig. 4 is an endview of the drying apparatus taken on the line Fig. 1 or 3. Figs. 5 and 6 are sectional 4and elevation views, respectively, of

Patented Feb. 8,1916.

a detail of lanother form'of apparatus. ,'Fig.

7 is an elevation of a discharging chamber.

modified form of' drying apparatus; and Fig. 9 is a compound transverse and sec. tional view taken on lines Y-Y-Z-Zof Fig. 8.

' Referring 'now in detail to these drawings, and particularly the modification shown in Figs. 1 to 4, inclusive, wherein` similar referencesl refer to similar parts throughout the severalviews of the drawings, 1 denotesthe 'furnace or vsource of heat of any suitable style, having a discharge flue 2 extending into the front end ofthe rotatable drum or drying chamber' 3 to pre-y vent short-circuiting of. hot gases between furnace and fan without passing through the drum. Thisdrum 3 is provided with a central longitudinal -flue 4, through which the heating medium from the furnace passes to the opposite end thereof, where it enters an annular header`5 having arranged about its peripheryl a plurality of .smaller 'tubes or lues 6 adapted to convey the heating medium backlto the front end of the drum where it is vdischarged into an annular hood 7 connected by means of a conduit 8 to an exhaust fan 9 mounted 'over the furnace 1 as shown clearly in Fig'gs.` 1 and 2. The ends Fig. 8 is a longitudinal sectional view of a of the centralv flue 4 and the return ilues 6 are so `connected with vthe header and a front tube plate 10 as to permit a longitudinal expansion and contraction thereof under varying temperatures. The return iiues' are supported fromthe central Hue 4 and also the vwall of the drum 3 by meansof suitable supports (11) which are so connected with the fines as to permit' a longitudinal movement thereof as the same eX- pandor contract. L

Near the rear or4 discharge end of the drum, through the outer wall thereof, are a4 plurality .of openings 12 through whichthe dried material is adapted tofpass as the vdrum rotates. Surrounding .the drum at this point is an annular chamber 13 Fig. 7 having a hopper bottom 14 adapted to collect the dried material. A sliding door 15 is provided at the bottom of the hopper to permit a removal of the material collected therein.

The discharge Hue 2 from the furnace extends slightly into the front end ofthe drum 3, and isV preferably surrounded by an annular sleeve 16 of the central Hue'4 in the drum 3. Between this sleeve and the furnace Hue 2 is a suHicient space, not only to avoid friction between the rotating sleeve and the stationary Hue, but to permit the entrance of a certain amount of air to the Hue 4 to effect a more perfect combustion of the heating medum as it passes through the Hues Within the drum. About this point of connection is provided the stationary hood 7 supported upon suitablelegs 17 restlng on a foundation as shown in Fig. 4, and the walls thereof are adapted to have a sliding contact with the outerperiphery of the drum and sleeve, as shown at 18 and 19, Fig. 3. It will be understood by referring to this ligure that as the drum rotates, the annular sleeve from the central Hue and a partition 20 carried b the drum have a comparatively close or sli ing contact withv the walls ofthe hood.

The annular partition 20 is connected to the front tube plate 10 about midway between the annular sleeve 16 of the Hue 4 and the wall of the hood 7 forming a receiving chamber 21 for the gases and moisture derived from the material as the same is dried andalso a chamber 22 into which the heating medium is discharged. At one side of .this chamber 21 passing through the outer carried along by air currents passing through the drum from the discharge opening 12 to vthe chamber at the front end thereof'. It

will be observed thatthe conveyer 23 is so disposed that the entering material is discharged from the conveyer onto the inner surface of the drum, passing by the adjacent portion of the rotatable Hue 4 without contact therewith. This makes for more eHicient operation than where the material is permitted to contact or fallon the rotatable Hue on entering, as there is then a tendency for some of the material to accumulate and be retained on this portion of the Hue.-

The drum 3 is provided about its outer wall with an annular ring 26 provided with teeth meshing witha pinion 27, 'adapted to be rotated through suitable connecting means by a motor 28, as shown in Fig. 2.

There are also provided suitable annular rings 29 having plain surfaces adapted to rest on the sets of rollers 30 mounted beneath the drum. The sides of one of these rings, or both. if desired, are engaged 'by horizontally disposed rollers 3l adapted to prevent a longitudinal movement of the drum.

By an arrangement of belts 32 and pulleys 33 Fig. 2, the conveyingapparatus 23 and the exhaust fan 9 are driven simultaneously from the same motor.

The operation of this apparatus should be largely obviousfrom the above description, but will, nevertheless, be set forth, in brief, as follows:v Assuming that a suitable Hre has been built within the furnace 1 and the it falls on' the heated return Hues 6 at the side thereof. As these Hues rotate with the drum they carry the material upwardly and 'allow the same to fall by gravity on to the `center Hue 4, from which it again falls to the bottom of the drier. The drum, being slightly inclined with respect to the horizontal, gradually conveys the material the entire length thereof as it rotates until it passes through the openings 12 at the opposite end into the stationary receiving chamber or hopper 14 from which it may be removed when desired. The 'suction fan 9 not only insures a rapid passage of the heating medium through the Hues, but also causes a current of air to pass through the drum from the discharge endthereof in a direction opposite that to which the* material is fed, thereby carrying 0H' all Athe steam and moisture expelled from the-material as the same is dried.

ReferringV now to the modification as shown in Figs. 8 and 9, which illustrates a form of drier similar to that shown in the first modification in general principle and operation, but of a smaller size, the source of heat 'or'furnacev 14 is similar to? Ithat illustrated in connection with the first modification, but the drum,` however, 'instead of being provided with a main central Hue of relatively large diameter, is provided with a plurality of smaller Hues 34 arranged annularly about the interior of the drum. These Hues are connected at one end to a suitable tube plate or baffle plate 35 of vitreous material in amanner adapted to permit a contraction .or expansion of the same under varying degrees o`f temperature.

The opposite ends of these tubes discharge into an annular header 36 similar to that illustrated in Fig. 1. Circumferentially arranged about these receiving flues is a second series of return {lues 37' similarly connected with the header 36 and the tube plate 35 at the forward end. Supports 37 are also provided between -the tube plate and the header for holding the iiues in relative position and so connectedl therewith as to permit a sliding or longitudinal movement of 'the flues intheir contraction and expansion to prevent buckling of the same. On the rear face of the bailie plate 35 located at the forward end of the drum 3 is a conical deflecting plate 38' having a plurality of radially projecting partitions 38', as shown clearly in Figs. 5 and 6, adapted to direct the material to be driedfalling thereon well into the drum. A similar plate 39 is arranged at the rear end of the drum for discharging the material from the drum after the same is dried. Suitable means are providedv about the outer periphery of the drum for rotating the same in a manner similar to that illustrated anddescribed in reference. to the first modification. The annular rings 29 co-act with horizontally disposed rollers 31 rotating about vertical pivots to prevent a longitudinal movement of the drum. An annular partitionor plate 40 is provided at the front end of the'drum connected with the front wall of the bail'le plate or tube plate 35, surrounding the flue 2 leading from the furnace. A space is preferably provided-between this partition ,and the flue to admit air to the receiving flues 34 to effect a more perfect combustion of the heating medium as the same passes .through the drum. Surrounding the point Aof connection between the .drum and the flues 2 of the furnace, is provided a stationary hood 41 having a vertical partition 42 dividing the same into two chambers 43-44.

One of these chambers 43l communicates.

with the ends of the return flues while the lother chamber 44 communicates with an .mounted on the drum 3 and rotating therewith, and discharged onto the heated pipes when the lbuckets reach lsubstantially the highest point of their path. v An opening 48 is provided in the partition having a suitable damper arrangement, if desired, whereby the moisture expelled from the material .is drawn off with the heated products of` combustion by the same suction fan 9 mounted on the furnace. v

The operation of the apparatus is, in

, brief, as follows: The heating medium of the furnace passes through Athe receiving allowed to fall over the heated pipes onto the plate 38 from whence it is shot vwell into the drum against the heated pipes at the lower part` thereof. -These pipes scoop up the material, acting thereon as blades, andcarry it around the inside of the drum and gradually toward the discharge end thereof. As it collects at'the rear end of the drum it is scooped up by the pipes .as before, and on reaching approximately the highest point, falls onto the plate 39, from whence it is discharged to the outside of the drier.

As many changes could be made in the above construction and many apparently widely. different embodimentsv of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description -or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. It is also to be understood that the language used in the followlng claims is intended to cover all of the generic and specific features of the invention herein described, and .all statements of the scope of the invention which, as a matter of language, might be between.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an apparatus of the class described, in combination, a source of combustible heating medium, a drum, a flue therein, ro-

table therewith, open at the front .end and communicating with said source of heat,

and a Second flue connected with said first mentioned flue at the rear endthereof adaptedto convey the heating medium back `to the front end of saiddrum whereby the material to be dried may pass through said drum out of contact with the heating mediunifi 2. In an apparatus of the class described, in icombination, a source of combustible heating medium, a drum, a flue therein open at the front end and communicating with said source'of heat, a header at the opposite end into which saidfiue passes, and a second flue parallel with said rst iiue extending from said header yto the front end of said drum whereby material may be dried within said drum without coming in contact with the heating medium.

3. In an apparatus of the class described,` in combination, a source of heat, a rotating drum, a central longitudinal flue in said drum through which the products of comsaid to fall there? v for conveying the products of combustion back to the front end of said apparatus.

i. In a device of the class described, in combination, a source of heat, a rotatable drum, a central longitudinal Hue connecting with said source of heat extending through4 said drum, a header at the opposite end of said drum into which the products of combustion are discharged, a plurality of re- Aturn Hues located about said central Hue connected with said header and with the front end of said apparatus, and supports :for said Hues connegted to the inner periphf ery of saidvdrum.

5.l In anapparatus of the class described,

in combination, a source of heat, a rotatable drum, a central longitudinal Hue connected with said source of heat for conducting a heating medium through said drum, a plurality of return Hues located about said central Hue and connected therewith adapted to convey the heatingmedium back to the front end of said drum, and a tube plate v for holding "said Hues in proper relative position and forming a closure for said drum.

6, In an apparatus of the class described,

in combination, a substantially horizontally disposed rotable drum, a plurality of Hues -withinv said `drum adapted to form a circuitous passage for the heating medium therethrough, means for introducing material to be drled into one end of said drum and l openings provided at the opposite end of said drum to permit the discharge of the material'after the same has been dried, means for collecting said material, and means for rotatingsaid drum.

7 In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, a source of heat having a suitable stationary Hue, a central longitudinal Hue within said drum and rotatable therewith, adapted to surround the first-mentioned Hue, and means for conveyend of said central longitudinal Hue bacli ing the heating medium discharged at one 'to the front end of said drum.

-8. In an apparatus of the class described,

.in combination, a source of heat having a stationary Hue, a substantially horizontally .disposed rotatable drum having a central longitudinali-lue, an extension on said longitudinal Hue surrounding said Hrst mentioned Hue, a plurality of Hues about said central longitudinal Hue connected therewith at the rear end of said apparatus, a tube plate at the front end of said drum for holding said Hues in relative position, and an annular partition connected with said tube plate forming a chamber adapted toreceive the heating medium after it has passed through said apparatus.

' 9. In an lapparatus of the class described, in combination, a substantially horizontally disposed rotatable drum and central longitudinal Hue, .a plurality of Hues surrounding said first mentioned Hueand connected therewith at one end, and an annular chamber formed at the opposite end of said drum into which the heating medium is discharged after passing through said drum.

10.` In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, a central ,longitudinal Hue, a plurality of Hues surrounding said central Hue and connected therewith at one end of said drum, a tube plate for holding said Hues in relative position and furnishing communication between said Hues, and an annular space in said tube plate to permitthe admission to the interior of said drum ofthe material to be dried.

11.` In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, a central longitudinal Hue, a plurality of smaller Hues surrounding said Hrst-mentioned Hue, a header at'one end of said drum connecting said Hues to form a continuous passage for the heating medium and furnishing communication. between said Hues, and a tube plate at the opposite end of said drum having an annular space between the central and outer Hues to permit the admission to the drum ofthe material to be dried.

l2. In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum having a central longitudinal Hue and a plurality of smaller Hues between said central Hue and the inner wall of said drum, a tube plate at one end of said drum for holding said Hues in relative position, and means to permit an expansion of said Hues in'said tube plate under varying degrees of temperature.

13. In an apparatus of the class described,

vin combination, a rotatable drum, a central longitudinally disposed Hue, a plurality of Hues about said central Hue, a header formin combination, a rotatable drum having a central longitudinally disposed, Hue, a plurality of Hues about said first-mentioned Hue, a tube plate at oneend of said drum, and -a header at the opposite end of said drum forming a connecting passage between said Hues, said Hues being connected with said tube plate and said header in a manner 'to permit an expansion or contraction of eader lat one end of saiddrum connecting said flues adapted to form-a circuitous passage for said heatingl medium through said drum, said drum having a plurality of discharge openings in its outer wall,'and a hopper surrounding said openings tocollect the material as it isdischarged.'

16. In an apparatus of the class described, in' combination, a plurality of lues within said drum adapted to form a circuitous pas-y sage for the heating medium therethrough, a tube plate at one end of said drum having an annular space therein to permit the admission of the material to be dried, an annular partition on said tube plate, and an extension to one of said {lues co-acting with lsaid annular partition to form a chamber through which the material to be -dried is adapted to pass.

1 In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, a plurality of lues withinsaid drum forming a circuitous passage for the heating medium therethrough, a header at one end of. said drum, a tube plate at the opposite end adapted to hold said ues in relative position, said flues being connected with said header and said tube plate in a manner to permit a contraction or expansion of the same under varying degrees of temperature, and intermediate means between said header and said tube plate adapted to hold saidflues in relative position.

18. In an apparatus of the class described,

in combination, a source of heat, a stationary hood, and a' rotatable drum having van extended portion thereof interposed between said source of heat andthe walls of said stationary hood. A

19. In an apparatus of the class described, in combination, a source of heat, a substantially horizontally disposed rotatable drum having an extended portion and a stationary hood, the extended portion .of said rotatable drum interposed between said source of heat and said stationary hood.-

20. In an apparatus of the class described, in combination, a substantially horizontally disposed drum, asource of heat, a station'- ary hood and annularl partitions on said drum co-acting with said hood and said source of heat to form a lchamber within said hood.

21. In an apparatus of the class described, in combination, a rotatable drum, a source of heat, a stationary hood and a plurality of annular partitions surroundingv said source of heat co-acting with the walls of said hood to form therein.

a plurality of chambers 22. In an apparatus ofthe class described,

in combination, a substantially horizontally disposed rotatable drum, a source of heat, a stationary hood, a' partition, said drum, said partition and said hood co-acting to form a plurality of annular chambers, a suction fan, and means connecting one of said cham-- bers with said fan.

23. In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, asource of heat, ,a

stationary hood, a partition, said drum, said partition and said hood co-acting to form a plurality of annular chambers, a suction fan and means connecting said chambers with said fan.

24. In an apparatus of the class described, in combination, a rotatable drum, a source of heat, a stationary hood, a partition, said drum, said partition and said hood arranged to form a plurality of annular chambers, a suction fan and means connecting said suction fan with one of said chambers for removing the products of combustion discharged thereunto. l

25. In an apparatus of theclass described, in combination, a rotatable drum, a source of heat, a stationary hood, a partition, said drum,fsaid partitionand said hood arranged to form a plurality of annular'chambers, a

:suction fan and means connecting said suc- 26. Inan apparatus of the class described,

incombination, -a stationary hood, a partition, a rotatable drum, said hood, said partition and said drum co-acting to form a plurality. of annular chambers, one of said chambers being adapted to receive the products of` combustion after having -passed through said drum, theA other of said chambers communicating with the interior of said drum, and means connected with said cham' bers for'removing the products of combustion andthe moisturegiven oil' by the material as thesame is dried.

' 27. In an apparatus of the class described, in combination, a stationary hood, a partition, a rotatable drum, said Idrum, said partition and said hood co-actmg to form a plurality of annular chambers, communicating openings between one of said chambers and the interior of the drum,'a suction fan', means connecting said suction fan with said second-mentioned chamber to' draw olf the moisture given off by thematerial as the same is dried, and means for In an apparatus of the class described,

acting to form a plurality of annular chambers about said source of heat, means for discharging the roducts of combustion through one of .said chambers, the other of said chambers communicating with the interior of the drum to receive .the moisture given off by the material as the same is dried, a suction fan, means connecting said suction fan with said chambers, and means for regulating the amount of air drawn throu h said chambers. i

29. n an apparatus of the class described, in combination, ya stationary hood, a substantially horizontally disposed rotatable drum, an annular partition connected therewith, the walls of said hood being in a general vertical direction, the walls of said drum and partition being in a general horizontal' direction, said Walls being in contact and arranged to permit a longitudinal expansion or contraction of the walls of the A drum under` varying degrees of temperasaid furnace adapted to remove the productsl ture.

30. In an' apparatus of the class described, jin combination, a source of heat having a stationary flue, said source adapted to supply combustible gas, a drum having a central longitudinal Hue surrounding said first-mentioned flue, thereby vproviding a space communicating with the atmosphere surroundin said stationary, iue to permit the admisslon of air to said second-mentioned Hue to complete the combustion of the gases as they pass through the apparatus.

31. In an apparatus of the class described, in combination, a-y ,rotatable substantially horizontally disposed drum having a central longitudinal flue, a source of heat, adapted to supply combustible gas and having a stationary iue projecting into said iirst-mentioiied flue, said llues providing a space therebetween to permit the admission of air'into said first-mentioned flue to complete combustion of the gases as they pass through the apparatus, and means for 4creating a draft throughsaid Hue.

V32. In .an apparatus of thev class described, in combination, a substantially horizontally disposed rotatablev drum, a stationary hood, al furnace, a flue, a flue-passing longitudinally through said rotatable drum, a ue from the furnace communieating therewith, a plurality of return Huss about said central flue for conveying the heating medium back to the front end of the drum and a` suction fan mounted :on

of combustion after having, passed through said drum.

33. In an apparatus of the class described,

in combination, a substantially horizontally dis osed rotatable drum, a stationary hood,

a urnace, a flue .from the furnace communicating therewlth,` a plurality of Areturn iues about Asaid central flue for conveying the heating medium back to the front end of the drum, a suction fan mounted on said furnace adapted to remove the products of combustion after having passed through said drum, and a branch pipe connected with said suction fan adapted to remove the moisture expelled by the material as the same is dried.

34. In an apparatus ofv the class described, in combination, a rotatable drum, a stationary hood, va source of heat, a flue connected with said source of heat projecting into said drum, a plurality of fiues within said drum connected with the iirst mentioned iue furnishing a circuitous passage for the heating 'medium through said drum, and means mounted on said source of heat for drawing the heating medium through said apparatus.

35. An apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, a source of heat having a flue rojecting into said drum, a stationary hood) surrounding the connection between said luefand said drum, a plurality .of flues Within said drum connected with said first-mentioned flue to form a circuitous passagev for the heating medium therethrough, means mounted on said source of heat for creating a draft through said apparatus, and means connected with said last mentioned means communicating with the interior of said drumfor withdrawing the moisture given off of the material as the same is dried.

36. In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, a source .of heat, a vplurality of flues Within said drum, a flue connected with said source lof heat communicating with said first-mentioned lues to form a circuitous passage for the heating medium through said apparatus, means mounted on said source of heat and communicating with the interior of the drum for withdrawing the moisture given ol' the material as the same is dried.

. 37 In an apparatus of the class described, in combination, a'source of heat, .a substantially horizontally disposed rotatable drum, means for rotating said drum, a plurality of flues for conveying the heating medium circuitously` through the drum out of contact with the material to be dried, means for introducing the materialto be dried at 4one en d thereof, suction means for creating a draft for the heating medium through said drum and connections whereby all of said Ibefore mentioned means are operated simultaneously.

38. In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, means for rotating said drum, a conveyel. means for introducing the material, 4to -be driedinto said ing the naterial to be dried into said drum a suction means for creating a draft to the heating medium through said drum and separately withdrawing' the moisture given off by the material to be dried, means for regulating said draft, and connecting means `between all of said. above-mentioned means whereby the same are operated simultaneously.

40.' In an apparatus of the class described,

in combination, a substantially horizontally disposed rotatable drum, means for rotating.

said drum, 'means for introducing the material to be dried through saidvdrum, a plurality of flues within the drum for convey; ing the heating medium therethrough back and forth out of contact with the material to be dried,`and means connecting said rotating means and said introducing means whereby the same 'maybe operated simultaneously.

41. In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum', a source of heat Y connected therewith, va stationary hood surrounding said connection, a plurality of {iues within said drumcominunicating with said source of heat for conveying the heating medium circuitously and out of contact with the material to be dried through said drum, suction means for creatinga draft for the heating medium and conveyer means at one end of said drum for introducing the material to be dried thereinto.

42. In an apparatus of the class described,

in'combination, a substantially horizontally disposed rotatable drum, a source of heat connected therewith, a stationary hood surrounding said connection, means co-acting with the walls of said drum and said hood to form a plurality of annular chambers about said connection, means for introducing the material to be dried through vone of said chambers, and means for withdraw-y ing the heating medium through another of said chambers. 7

43. In an apparatus of the class described, in combination, a substantially horizontally disposed ,rotatable drum, a source of heat connected therewith, a stationary hood surrounding said point of connection, a plurality of annular partitions co-acting with -the walls of said hood and said drum to form a plurality of annular chambers,

means for conveying the material to be dried through one of said chambers, means for withdrawing the moisture given off by the material as the same is dried .connected with said same chamber, and means connected with another of said chambers for with drawing the heating medium after the same has passed through the drum.

44. In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, a source lof heat connected therewith, a stationary hood surrounding said'point of connectiornan annular chamber lformed bythe walls of said hood and said drum, means for conveying the material to be dried through saidv chamber, and means communicating therewith vfor withdrawing the moisture given oil by the material as the same is dried.

45. In an apparatusof the class described, in combination, a substantially horizontally disposed rotatable drum provided with discharge openings at one end thereof, a hood surrounding the opposite end of said drum having walls co-acting with the walls of said drum to form an "annular chamber, means for introducing the. material to be dried throu h said chamber, suction means connecte with said chamber for withdrawing the moisture given offv by the material to-be dried and for creating a draft through said drum from said discharge opening in a d1- rection opposite that to which saidmaterial is passed.

46. In an apparatus of the class' described, in combination, a substantially hori-` zontally disposed rotatable drum, means for rotating said drum, a plurality of connected ues'within said drum, a source of heat connected with sai'd fiues, a statlonary hood and partitions co-acting w1th the walls of said `hood and `Said drum to form a pluralityl of chambers about the connection between said source of heat and saidlues, one of said chambers communicating with said flues into which the heating medium is discharged after passing through the drum,

and another of said chambers communicat ing with the interiorof said drum adapted to receive the moisture given off from the material as the same is dried.

47.' In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, a plurality offlues therein having sliding connections with the walls of said drum to permit a con-4 traction and expansion of the parts under varyingl degrees of temperature, a source of heat connectedwith said iues, a hood surrounding the point of connection between the flues and the source of heat, an annular chamber formed by the walls of said drum Aand said hood through which thev material to be dried is passed, a conveyer for introdu'cing the material, means for rotating thev drum, andA connecting means between said rotating means and said conveyer means whereby the same operate simultaneously.

` 48. In an apparatus of the class described, in combination, a substantially horizontally disposed rotatable drum, a source of heat connected with said drum, afhood surrounding the point of connection between saidl parts, a tube plate located at one end of said drum and a header at the opposite end, a plurality of Hues supported by said tube plate and said header arranged to have a sliding connection therewith permitting they contraction and expansion of the Hues under varying degrees of temperature, an annular partition connected with said tube plate'dividing said hood into a plurality of chambers, one of said chambers communicating with said Hues, another of. said chambers communicating with the interior ofthe.

heat.

50. In apparatus of the class described, in

combination, a source of heat, a drum, a Hue associated therewith and connected with the source of heat, and means providing for combustion in the Hue.

51..In an apparatus of the character described,'in combination, a drum, a source of heat having a Hue projecting into said drum for conveying the heating medium thereto, and a Hue within said drum having a portion thereof Surroundingthe Hue from said source of heat, said Hues being suiiiciently spaced to permit the admission of air to effect a more perfect combustion of the heating medium as the same passes through the drum. l 52. In an apparatus of the character described, in combination, a horizontally disposed, rotatable drum, a source of heat having a Hue projecting into said drum, and a longitudinal Hue within said drum and rotatable therewith, a portion of which sur- .rounds the Hue connected with said source of heat and being of larger diameter than the body portionkof said Hue, said rotatable Hue being so disposed with respect to the stationary Hue as to permit a longitudinal expansionand contraction thereof underl varying degrees of temperature.

53. In an apparatus of the character described, in combination, a rotatable drum l having a longitudinal Hue, a source of heat,

a Hue connected therewith and projecting into said first mentioned Hue forming a space between" lthe same for the admission of air toJsaid first-mentioned Hue, a hood surrounding the point of connection between said Hues, and means for conveying the material to be dried into said drum at one side of said point of connection. l

554:; In an apparatus of the character described, in combination, a 'source of heat, a rotatable drum,` a central longitudinal Hue therein, a Hue connecting said source of heat to said drum and projecting into said central flue, the portion of said Hrst mentioned Hue surrounding the second mentioned Hue being of larger diameter than the body portion thereof.`

55. In an apparatus of the character described, in combination, a drum, a source of combustible heating medium, and a Hue construction having a portion for conveying said combustible'heating medium from one end to the `other end of said drum' and another portion for returning said, heating medium toward said first-mentionedl end.

, 56. In an apparatus of the class described, in combination, ay hood, a rotatable drying drum, one end of which communicates with said hood, a Hue mounted in said drum and communicatingwith said hood, and a second Hue in said drum communicating with said first Hue and out of direct communication with said hood.

57. In an apparatus of the class described, in combination, a hood, a rotatable drying drum, one end of which communicates with said hood, aHue mounted in said drum and communicating with said hood, a second flue in said drum communicating with said first Hue and lout of direct communication with said hood, and a pipe adapted tolead a heated current to said second Hue.

58.' In an apparatus of the class described, in combination, a hood, a rotatable drying drum, one end of which communicates with said hood, a Hue mounted in said drum and communicating with said hood, a second Hue in said drum communicating with said Hrst Hue and out of direct communication with said hood, and a .pipe comprising a portion within and transversely spaced from said second Hue adapted to lead a heated current thereto:

59. In an apparatus ofthe class described, in combination, a hood, a rotatable drying drum, one end of which communicates with said hood, a Hue mounted in'said drum and communicating with said hood, a second Hue in said drum communicating with said first Hue', said second Hue having a concentrlc vportion of different diameter passing through said hood, and a pipe comprising a portion within said ortion'of d1H`erent diameter and spaced ongitudinally from llt the shoulder formed by the dierent sized portions of said second flue.

60. In an apparatus of the class described, in combination, a hood, a rotatable drying drum, one end of lWhich communicates with said hood, a flue mounted in said drum and communicating with said hood, a second iiue in said drum communicating With said iii-st flue at a point adjacentthe opposite end of said drum and out of direct communication With said hood, drat-producin means, and passageways connecting'I said draft-producing means with said hood and the interior ofsaid drum, respectively.

61. In an apparatus of the class described, in combination, a hood, a rotatable drying drum, one end of Which communicates With said hood, a flue mounted in'said drum and communicating with said hood, a second flue in said drum communicating with said iirst iiue at a point adjacent the opposite end of said drum and out of direct communication with said hood, draft-'producing means, passageways connecting said draft-producing means with said hood and the interior of saidl drum, respectively, and means adapted to control the draft through the passageway communicating with said drum.

62. In an apparatus of the class described, in combination, a stationary hood having spaced upright walls and inner and outef) concentric chambers, va substantially hori-f zontal rotatable cylindrical drum extending.

Within an upright Wall of said hood and communicating with the inner chamber of said hood, a centrallydisp'osed, longitudinal iue mounted on said drum and extending through said Walls of said hood, anda plurality of longitudinal iues carried by said drum around said central flue, said plurality of flues opening into said outer chamber at one end andcommunicating with said central flue at their opposite ends.

63. In an apparatus of the class described, n combination, a hood comprising a plurality of chambers, a rotatable drying drum, the interior of which communicates with one of -said chambers at one end, a ue mounted in saiddrum and communicating with another of said chambers, a second tlue Iin saiddrum communicating with said first flue ata point adjacent-the opposite end of said drum and out of directcommunication with said hood, and means passing through A one of said chambers adapted to charge-the drum with material to be dried.4

64. In an apparatus of the class described, in 'combination,.a stationary hood Ihaving spaced upright wallslaiid inner and outer concentric chambers, a substantially hori-l zontal rotatable' cylindrical drum extending within an upright wall of said hood' and communicating with the inner chamber of said hood', a centrally disposed longitudinal i'luemounted on said drum and extending through said walls of 'said hood, a plurality of longitudinal ues carried by said drum around said central iiue, said plurality of iues opening into said outer chamber at one end and communicating With said centrali lueat their opposite ends, and means passing throughsaid inner chamber adapted to charge the drumWith material to be dried.

65. In an apparatus of the class described,

in combination, a stationary hood having spaced upright Walls, a substantially horizontal rotatable 'cylindrical drum extending within an upright Wall of said hood-at one end, a central longitudinal iue carried by said drum and extending-I through the Walls of said hood, a plurality of longitudinal4 lues carried by, said drum around said central flue, said plurality oflues opening into said hood, said drum having a central openf ing communicating With-'said hood, anda concentric partition in said hood between spaced upright Walls, a substantially horizontal' rotatable cylindrical drum extending lWithin an upright Wall of said hood at one end, a central longitudinal flue carried by said druni and extending through the Walls 'of said hood, a plurality of longitudinal flues carried by said drum around said central 'lue, said plurality 4or' fiues opening into said hood, said drum having a central opening communicating with said hood, and a concentric extension forming a partition 'in said hood between the central opening ofsaid drum and the adjacent openings of said plurality of iiues.

67. In an apparatus of the class described, in combination, an upright hood, a substantially horizontal rotatable cylindrical metallic drum extending Within a Wall of said hood at one end and closely associated With said Wall, said drum having a concentric partitioning plate extending toward the opposite Wall of said hood and closely associated with said opposite Wall, a flue carried by said drum having a .concentric portion extending into'close contact with said opposite Wall, and a series of lues around said central flue, communicating With said hood on one side'of said plate and With said central iue adjacent the opposite end of said drum.

68. In an apparatus of the character described, in combination, a rotatable substanrtially horizontally disposed drum, a rotaflue adapted to discharge the heating medium into said Vfirst mentioned flue ad]acent ,one end portion of said drum, means adjacent said end ofthe drumadapted to create a draft from said source of heat through said rotatable ilue to the exterior of the drum, said stationary flue and sald rotatable ilue being so disposed ,as to provide an` opening therebetween adapted to communicate with the atmosphere and saidrotatable one end portion of said drum, a feed opening leading to the space between said drum and flue, and means adapted to guide the entering material past said rotatable liuc into said drum without contact with the rotatable Hue adjacent the entering path of said material.

In testimony whereotl I affix my signature in the presence of two witnesses.

VILLIAM B. RUGGLES.

Witnesses APETER P. BECK, PAUL A. BLMR.

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