US1203573A - Mining-machine. - Google Patents

Description

S. P. C. BORSON.

MINING MACHINE; APPLI'CATION FlL ED NOV-27, 1914.

1 203,573. I Patented Nov. 7, 1916.

3 SHEETS-SHEET l- WITNESSES:

S. P. C. BORSON.

MINING MACHINE. I APPLICATION FILED NOV. 27, 1914- 1,203,573. Patented Nov. 7,1916.

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S. PqC. BORSON.

MINING MACHINE. APPL'ICATION men NOV. 27. 1914.

1,203,573. Patented Nov. (,1916.

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with the drive shaft as one integral structure. The concentrating chamber, or con: centrator, consists of a shell or caslng 20, cylindrical or polygonal in cross-section,

3 terminating above in a peripheral or polygonal flange 21, and below in a central hub 22. An upwardly projecting sleeve 24, circular in cross-section, terminates in a guide hearing 25, in which the drive shaft 1, is journaled, and forms the lower face 26, of a thrust bearing of which the separator hub 11, forms the upper face; acircular flange or lip 12, projecting from hub 11, forms the external wall of the said bearing. 'The thrust bearing for the concentrating chamber isformed by the lower face of hub 22, the upper face of step bearing 2 and the circular flange or lip'23, projecting from hub 22. Circular thrust disks 41, and thrust collars 42, or ball bearing43, (Fig. 3) may be provided in the thrust bearings to reduce friction, v

An operating arm or lever 27, provided with hole 28, projects from one side-of hub 22, towhich it is rigidly secured. This arm serves to vibrate the concentrating receptacle about the drive shaft 1, through an angle of less than 180 degrees. Power to vlbrate the concentrator 1s delivered to the operating arm 27, in any convenient n ann'er, in the method indicated in the drawings a bolt-"or pin 29, joins the operating arm 27, to the jaw 30, of a reciproeating connecting rod 31, (Figs. 4, l2 and 13, the jaw 30, is preferably provided with a slotted hole 32, for the pin 29, to vibrate in, and with a shock absorbing or shock reducing medium, as, for instance, rubber blocks or cushions 66. The drawing shows the connecting rod 31, bolted to an eccentric, but the objects of my invention may be accomplished equally well if,"instead of the eccentric, a crank pin is journaled 'in one end of the connecting red. A

A discharge outlet formed by one or more rectangular, elliptical, or oval slots or holes 33, is provided in the bottom ofthe concen trating chamber, preferably at the angle formed by the intersection of the bottom r and side of the bowl or casing 20, diametrically opposite the operating arm 27, as

shown in the drawings. An outlet gate 34, provided with one or more elliptical, or oval slots or holes 35, adapted to register with outlet passages 33, is slidably mounted in any convenient manner on the concentrator casing 20. In the method shown in the drawings a gate seat is formed on one, side by a recess or groove 37, in hub 22, and on the other side by a groovedguide 38, secured to concentrator means of rivets or bolts. and 40,

casing 20, by Pins or stops 39 secured to the bottom of concentrator casing 20, serve to limit the move ment of the gate 34; the outlet being open rectangular,-

or uncovered when the gate 34, is brought to bear againststop 39; and closed when the gate 34, is brought against stop 40, as shown :in Figs. 2 and 15. Gate operating means are furnished by slots or projections 36, shown in outline near the ends of gate 34. g

In connection with the outlet; and gate the following points are to be noted: 1. The number of slotted holes 35, in the gate 34, equals the number of passages 33, in the outlet. 2. In the closed position of the gate 34, the webs connecting and surrounding'the holes 35, completely cover the passages 33, forming watertight joints. In the open position of the gate 34, the holes 35, register with the passages 33, and permit the free discharge of. concentrates or other matter from withinth'econcentrator casing 20. 4. The gate 34, may be opened or closed at will, while the concentrator is in motion or at rest.

Figs. 3 and 4, show a modified design embodying my invention. Here the separator unit has been omitted, and the concentrator unit is designed to receive screened or sited material from a screening device or other proper source of supply, terminating preferably in a spout or chute 65. A; modified guide chamber is shown, having .the peripheral or polygonal flange lflthe apron l7, and the arms or brackets 19, rigidly conall the features previously described in connection with the concentrator shown in Figs. 1 and 2, but owing to the absence of mechanical agitators, :to behereinafter de scribed, the bottom may be made to slope toward the discharge outlet from a point 53, diametrically opposite. V

I Figs. 5 and 6, show another modified design embodying my invention. Here a drive shaft 1, is rotatably mounted in a step bearing 2, and in a guide bearing 3, secured to external framework 4, A feed hopper 6, is suspended above and within thev concentrator, and supported by means of lugs 7, rigidly secured to casing 6, and to the external framework 8 For the sake of clearness of illustration the lugs 7, as they appear in 6, have been rotated through a horizontalangle of 45 degrees from their position in Fig. 5. The concentrator contains the casing 20, flange 21, hub 29, operating arm or lever 27, and the discharge outlet. and gate detail described in connection with Figs. 1 and 2. The hub extension 24, is carried up on the drive shaft sufficiently to insure stiffness and rigidity, and the hub 22, is rigidly mounted on the drive shaft 1, forming a watertight joint with same. This joint may be made by means ofa key, setscrews, screwthreads, or any combination thereof, or the drive shaft 1, may be cast into the concentrator hub 22, in the foundry. Power may be delivered through the operating arm or lever 27, in the manner hereinbefore explained; or the latter may be omitted and replaced by an operating crank 64, shown dotted, rigidly attached to the drive shaft near the top. I

The tailings or waste material may be discharged by gravity by simply erecting the machine with its axis inclined from the vertical, as shown in Figs. 1 and 3, thus causing the tailings to overflow over the lower side; but to facilitate the discharge of tailings or waste material, I prefer to add some positive mechanical discharging device to the machine.

One type of mechanical discharger forming a part of my invention is shown in Figs. 1, 3, 4 and 7 it consists of one or more scoop-like vanes 44, rigidly mounted on the guide casing 17, and revolving with the same. In Figs. 3 and 4, the discharge vanes are shown cast on the apron 17, while in Figs. 1 and 7, they are shown riveted or bolted on the apron 17 the latter method is considered preferable since it permits the vanes to be removed and replaced when worn. Two discharge vanes are shown in the drawings, but the purpose of my invention may be accomplished equally well by using any convenient number of vanes greater or less than two. Another type of discharger, forming a part of my invention, is shown in Figs. 5 and 6; it consists of a discharger 54,'having inlets 55 and 56, outlet 57, a central web or partition 58, enlarged to form a hub 59, provided with a central hole 60. The discharger is supported by a collar 62, on a shaft 61, and is free to slide or rise vertically on said shaft 61, but prevented from rotating about the latter by a key 63. The discharge vanes 44, are best adapted to chine erected with its axis of vibration in clined from the vertical, as shown in Figs. 1 and 3, while the discharger 54, is best adapted to be used on a machine erected with its axis of vibration vertical; but the objects of my invention may be accomplished equally well by using the discharger- 54, in connection with a machine erected with an inclined axis of vibration. The vanes 44, may also be used in a machine erected with a vertical axis, by constructing the concentrator with the casing 20, and flange 21, lowered or depressed on the side where the discharge is desired. This construction is shown in Fig. 11.

To prevent detrimental action due to depositsof sediment on the bottom of the concentrator, particularly 'after the latter has been at rest, I find it necessary to stir or agitate the material in the lower part of the concentrator, while the latter is inmotion.

be used in connection with a ma-- 1 or straps and screws or bolts.

A form of mechanical agitation embodying my invention is shown in Figs. 1 and 2; it consists of one or more metal bars 45, round, square, oval, or rectangular in cross-section, rigidly mounted on the apron 17, of the guide chamber, with their lower ends in close proximity to the bottom of the con-.

centrator. The bars 45, are riveted or bolted on the apron 17, in such manner that they may readily beremoved and replaced when worn. The rotation of the apron 17, and the attached agitating bars 45, causes a local agitation of the material near the bottom of the concentrator where such action is desirable, but leaves the upper strata undisturbed. Similar agitators 45, are shown in Figs. 5 and 6, rigidly mounted on the feed hopper 6. As the said feed hopper and agitators are stationary the agitating action is caused by the vibration of the concentrator casing 20.

In the drawing four agitating bars are shown, but the objects of my invention may be carried but equally well by using a greater or less-number of agitating bars. In Figs. 8, 4 and 14, is shown another agitating device embodyingmy invention. It consists of a system of piping adapted to carry air, water, steam, gas, or any similar fluid, under a pressure higher than atmospheric. As the fluid escapes from a medium of higher to a medium of lower pressure it forces its way up through the material in the concentrator and by this action agitates said material. The said agitating fluid has a further beneficial action in that it subjects the various particles of material in the concentrator to upwardly actingforces, and thereby improves the process of concentration.

The system consists of a flexible tube or hose from a reser- 46, (Figs. 4 and 14'), leading I voir or other source of supply, inlet pipe 47 main supply pipe 48, branch supply pipes 49, distributing pipe 50, discharge pipes 51, and discharge outlets or nozzles 52, formed by holes through the casing 20. The drawings show two branchv supply pipes 49, and

four discharge pipes 51., but the'purpose of my invention may be accomplished equally' well by using a greater or less number of these pipes. The pipes are secured 'to the casing 20, by means of ordinary pipe clamps To avoid a multiplicity of views, all the different combinations of details which itis possible to formwith the matter disclosed have not been shown separately in the drawings; but it is evident that without deviating from the principle of my invention I may combine in operative relation any element shown in one view with the corresponding element or elements shown in another view,

1 as for instance: the concentrators shown in Figs. 1, 2, 3, and '4, may be equipped with the discharging device 54, instead of the dis,-

chargev-anes 4 the concentrators shown in Figs. 1, 2, 5 and 6, may be equipped with fluid agitating means instead of mechanical agitators; the concentrators shown in Figs.

1, 2, 5 and 6, may be constructed with slop-' lng instead of straight bottom; the machines shown in Figs. 1, 2, 3 and 4, maybe erectedwith vertical instead of inclined aXis of rotation; the concentrator shown in Figs. 3 and 4, may be equipped with mechanical instead of fluid agitating means; and the concentrator shown in Figs; 3 and at, may be constructed with straight instead of inclined bottom.

In operation the mixture of'fine and coarse material andwater is delivered by the feed hopper into the bottom of the screening device near the center of the same, the wall of the feed hopper protecting the incoming raw material from contact with the departing screened material. The water serves the double purpose of washing and freeing the oversize material from all fine concentrates, and of preventing clogging of the screening surface. By the centrifugal action developed by the rotation of the separator the oversize material is elevated and discharged over the periphery of the screening device while themixture of fine material and water passes through the screen and enters the concentrator through the guide casing. The latter introducesthe mixture of fine material and water into the bottom of theconcentrator near the center of the same, the wall of the'guide casing protecting the entering material from contact with the departing tailings and gangues. The oscillating motion of the concentrator, combined with the'action of the agitating means, maintains the material in the concentrating receptaclein a state of fluidity and mobility, causing the concentrates to at'once descend and the tailings-and gangues to ascend.

Referring particularly to Figs. 1 and 2, power is delivered at the pulley,- gear, sprocket, or sheave 5, by means of a belt, gear, chain, or rope, not shown, and a revolving motion, in the direction ofth e arrow, Fig. 7, imparted to the drive shaft,

separator, guide chamber, and agitators 45.

At the same time a vibrating motion is imparted to the concentrator, by means of the operating arm 27. Gold-bearing or metalliferous materials or ores are delivered preferably in a continuous manner into the feed hopper 6,and by the latter distributed over the bottom of the separator. WVater is also introduced into the feed hopper 6, through a water connection 67, leading from a source of supply. When the material, saturated with water, comes in contact with the revolving screen 13, it is whirled outward and upward by centrifugal force. Rock gravel and particles above a specified size are carried up over the screening surface, finally discharging over the lowest point of the flange l6, into-a hopper, tailings conveyer, of other arrangement provided, for the dispo'salof oversize material, while thesmaller particles,- or fines, are washed through the said screen 13, and by centrifugal force carried along the interior surfaceofthe casing 9, and up over the flange 10. Here the tendency'of the said fines is to leave the separator at a tangent, but this is prevented by the wall 15, of the guide chamber. The particles of material are for a moment poised in space while their potential energy is beingrconverted intokinetic energy, and then the particles of material, guided by the apron 17 are;precipitated'into the concentrator. During the latter operation a certain momentum is imparted to the particles of'materialthe intensity of which is proportional to the respective specific gravities of the various particles; hence, the particles having the higher specific gravities are carried to a greater depth than those having lo-werspec-ific gravities. The vibratory motion of the concentrator serves to separate the fines into strata whose positions above the bottom-vary with their respective specific gravities. Theconcentrates having the higher specific gravity collect on the eX- treme bot-tom of the concentrating chamber, and as the lowest point ofthe latter communicates directly with the outlet passages 33, the concentrates may be drawn off continuously or intermittently by opening the outlet gate 3 1. The tailings, or; particles having the lower specific gravities, gradually ascend in the concentrating receptacle, partly by the centrifugal impulses imparted to them by the motion of the latter, and partly by being displaced by the incoming material; hence the said tailings are discharged in a. continuous series of impulses over the flange 21, into a hopper, tailings conveyer, orother arrangementprovided for the discharge'of tailings.

Under ordinary conditions the machine will be erected with its drive shaft and the axis of rotation of its chambers inclined from the vertical at an angle sufiiciently greatto effect'the discharge of tailings in the manner just described, but the displacement and discharge of tailings may be greatly accelerated by the addition of the discharge vanes 44:, and it is therefore my intention, under ordinary conditions, to equip my machine with one or more of these discharge vanes. Referring to Fig. 1, the horizontal line F F, represents the level at which the oversize material is discharged over the flange 16, of the separating chamber; the horizontal line HH, represents the waterlevel in the separator casing 9. and also the level at-which the fines passing through the screening device are discharged into the guide chamber; and the horizontal line JJ, indicates the level at which the tailings are discharged over the flange 21, of the concentrator casing; the line J-J, may coincide with the water level in chamber 20, or the latter may be slightly lower. One discharge vane 44, is shown submerged, and the other above the surface of the material. After a rotation of 90 degrees in the direc tion of the arrow, Fig. 7, one vane will be at the point of leaving and the other at the point of entering the material. Under certain conditions, as for instance when dealing with concentrates of comparatively low specific gravity, it is preferable to erectthe machine with its drive shaft and its axis of vibration vertical, or nearly vertical; and in order to insure the discharge of tailings at a given point on the periphery, it becomes necessary to construct the concentrator with the casing 20, and flange 21, depressed on the discharge side, as shown in Fig. 11, or to equip the machine with a discharger of the type shown in Figs. 5 and 6. The vibrating motion of the. concentrator produces powerful centrifugal impulses in the therein contained tailings. An impulse in the direction of the clockwise arrow, Fig. 6, hurls the tailings into the discharge inlet 55, whence it is deflected by the rib 58, into the discharge outlet 57, while an impulse in the direction of the anti-clockwise arrow, forces the tailings into the discharge inlet 56, against the rib 58, and into discharge outlet 57. Normally the vibrating impulses are delivered suiiiciently rapidly to produce a nearly uniform flow of tailings from the discharger outlet.

WVhen the concentrator is constructed without the separator, as shown in Figs. 3 and 5, the material for concentration is received screened or sized from an external sourceterminating in the spout or chute 65, and delivered into the guide chamber 17, Fig. 3, or the feed hopper 6, Fig. 5; water is delivered through the connection 67; and the process of concentration from this point is identical with that just described.

A detailed description of the process of concentration on which my invention is based, and a statement of the considerations governing the design of the machine for diiferent classes of material follow: Let it be assumed that the concentrator is partly or wholly filled with a saturated or semiliquid mixture of material to be concentrated, and that the concentrator is set in motion and vibrated through a horizontal angle of less than 180 degrees. For the purpose of illustration the machine is assumed to be divided into four types.

Type 1: Figs. 5 and 6, show a concentangent until restrained by the casing 20. Each vibration of the concentrator produces a corresponding motion of the particle, causing the latter to move in a path forming an arc of a circle. A particle of matter having a high specific gravity will describe adescending series 'of circular arcs, with constantly decreasing radii; while a particle of matter having a low specific gravity will describe an ascending series of circular arcs, with constantly increasing radii. Actually,

the particle will collide with other particles,-

and its path will be more or less erratic, but 1ts tendency will be to describe circular arcs. Type 2.: The concentrator casing shown in Figs. 1, 2, 3, and 4, is identical in con struction with that described under Type 1, but is erected with its axis of vibration inclined from the vertical. Theoretically, a particle of matter entering the concentrator tends to fiy'oif at a tangent until restrained by casing 20. Each vibration of the con centrator causes the particle to move in a parabolic path, owing to the constantly varying radius of vibration in any given horizontal plane, due ,to the inclination of the axis of vibration. A particle of matter having a high specific gravity willdescribe a descending series of. parabolas; while a particle of matter .having a low gravity will describe an ascending series of parabolas. Actually, the effect produced by a great number of particles moving in intersecting parabolic paths is in the nature of a tremor in each. horizontal stratum, which effect is intensified by collisions of the particles. 1

Type 3: In Fig. 8, is shown, in outline, a

concentrator having a polygonal cross-section. An octagonal casing isshown, but in actual construction the concentrator *may have any convenient number of sides greater or less than eight. A' particle of matter starting at the point a, Fig. 8, will move to the point I), in a path similar to that indicated by the dotted curve 69. The path in any horizontal plane follows the general direction of a circular arc composed'of a number of reverse curves; that is, a curve plotted through. the center of gravity of L each element of the dotted curve 69,- Fig. 8, would be a circle. The reverse curves are produced by the constantly changing radius of vibration; said radius being maximum at the angles, and minimum at the sides of the casing 20. The ascending and descending paths are governed. by the laws stated in connection with Typesl and 2.

Type 1: If the concentrator shown in outline in 8, is assumed to be erected g with its axis of vibration inclined from the trator having a circular cross-section, and vertical, a particle of matterwill-move 1n erected with its axis of vibration verticalg z.

a path represented-by a number of connecting reverse curves; but a line plotted through the center of gravity of each ele- .the structure 7 5.

ment of the dotted curve, from a to b, Fig. 8, would be a parabola.

Fig. 9, shows in-outline a horizontal section of a concentrator having a casing similar to that shown in Figs. 2, 4 and 6, but provided with a plurality ofribs or flanges 68, rigidly secured to the casing20. The object of these ribs or flanges is to cause a variation in the radius of vibration, and to produce a motion within the concentrator similar to that described under Type 3, when the machine shown inFig. 9, is erected with a vertical axis of vibration; and similar to that described under Type 4, when :the machine shownin Fig. 9, is erected with an inclined axis of vibration.

t comparison of the types of concentrator just described discloses the fact that the four types produce concentrating motions varying from gentle to intense. Type 1, for instance, is particularly adapted to the concentration of relatively non-cohesive materials of comparatively :low specific gravity; Type 2, to relatively non-cohesive materials of higher specific gi'avity;"Type 3, to relatively cohesive materials of coinparatively low specific gravity; and Type 4, to relatively cohesive materials of'higher specific gravity. It will thus be evident that although the principle underlying my invention does not inany case vary, .the actual design and construction of the machine is subject to variation'and modification to meet working conditions. The same is true of the agitators; experience has convinced ine that agitation of the lower strata is necessary. In localities where a fluid under pressure, such as air, water, gas, .etc., is available the machine may be designed and equipped with a system .of fluid agitation, while in localities where such agitating fluid is notecenomically obtainable, themachine will. preferably be-designed and equipped with mechanical agitators. Under certain conditions the concentrator maybe equipped with both systems of agitation.

To obtain capacity in excess of the -capac ity .ofa single machine,'I propose to operate .twoor more machines in battery. This is .shown in .Fig. 10, where two machines are erected on a platform 74., and supported by Power is deliveredto the two separators by the countershaft 76, .and to the two concentrators by the line shaft 77, operatively connected to shaft 76, by a':bel.ti78.. A'feeder 69, provided with discharge .chutes .and means for controlling and i regulating @thedischar-ge (therefrom, receives raw material from .an external source and discha-rges'the same into the feed hoppers 6. Oversize material is discharged from the separators into the hopper 71, and tailings .aredischarged from :the concentrators into the hopper '7 2. Hoppers 71 and 2'72, communicate, and the lower sectrating receptacle tion 73, of hopper 72, contains, or communicates with, a tailings co-nveyer or similar device for the removal of tailings and oversize material. The removal of concentrates is preferably effected by having the concentrators discharge into amalgamating or similar devices 70. Where no gravity supply of water is available a pump (38, provided with suction 79, and discharge 80, furnishes water to the feeders through valve-regulated nozzles on the conduit 67, and to the fluid agitators through valveregulated conduits 81, connecting with the flexible conduit 46, (Fig. 14). V] hen the machine isused for cyaniding or similarprocesses the pulp passes from the feeders 6, to the screens, the oversizes flowing into the hopper 71, and to apparatus for regrind- 'ing; the fines pass through the guide chamrangement shown in Fig. 10, also serves .to illustrate .the erection, 1n mult1ple, of the concentrator shown in Figs. 0 and i. The hoppers 6 and 71, would be omitted; the feeder 69, would/dischargedirectly into the guide chambers 17, of the concentrators, and the machine would be erected and operated in'the manner above described.

Having described my inventionl claim: 1. In combination, a guide casing-mounted .ii'or-rotation upon an inclined axis, a concentrating receptacle mountedupon an inclined axis below and concentric with said guide casing and adapted to receive material for concentration therefrom. said concen- A partly inclosing said guide casing, meansat-tachedto said guide casingadapted to elevate anddischarge tailings and gangues from said concentrating receptacle, means for rotating said guide casing about its axis, and means for oscillating said concentrating receptacle about its laxis, substantially as shown and described.

2. In combination,a-guide casingmounted for rotation upon an inclined axis, a concentrating receptacle mounted upon an inclined axis below and concentric with said 39'."

receptacle, controllable means for discharg ing concentrates at the "bottom of said concentrating receptacle, means for rotating said guide casing about its axis, and means i for oscillating said concentrating receptacle za-bout its :axis, substantially as shown and described.

3. In comb1=nat1on,.a guidecasingmounted for rotation upon anmclmed axis, a conforoscillating said concentrating receptacle about its axis, substantially as shown and described. 7

4. In combination, agconcentrating receptacle open at the top and converging from top to bottom mounted upon-an-inclined axis, said receptacle having its bottom pierced to form a plurality-of concentrates discharge outlets, controllable means for covering and uncovering sa1d discharge outlets, a guide casing mounted -forrotation upon an inclined axis within and partly above said concentratingpreceptacle, said guide casing being adapted todischargematerial for concentration centrally. above the bottom of said concentratingreceptacle in a manner to prevent contact between entering unconcentrated material and departing treated material, means attached-to said guide casing adapted to elevate and discharge tailings and ganguesl fromsaidconcentrating receptacle, means for rotating said guide casing about its axis-and meanscfor vibrating said concentrating receptacle about itsaxis, substantially'as shown and described.

5. In combination, a concentrating receptacle 'open'at the top and converging 'from top to bottom mounted upon an inclined axis, said receptacle .having its bottom pierced to'form'a pluralitvof concentrates discharge outlets, controllable gmeans for covering and uncovering said-discharge outlets, a guide casing mounted fOPTOtEItlOH uponan inclined axis within and partly above said concentrating receptacle, said guide casing being'adapted to discharge material for concentration centrally above the bottom of said concentrating receptacle in a manner to prevent contact between entering unconcentrated material and departing treated material, flanged vanes attached to and rotatable with said guide casing and adapted to elevate and discharge tailings and gangues from said concentrating receptacle, means for rotating said guide casing about its axis, agitating means to prevent the formation of sediment in said concentrating receptacle, and means for oscillating said concentrating receptacle about its axis, substantially as shown and described.

lets,

'6. In combination, a concentrating receptacle open at the top and converging from top to bottom mounted upon an inclined axis, said receptacle being apertured to'form a plurality of concentrates discharge outcontrollable means for coveringand uncovering said discharge outlets, a guide casing mounted for rotation upon an inclined axis within and partly above said concentrating receptacle, said guide casing being adapted to discharge material for concentration centrally above the bottom ofsaid concentrating receptacle in a manner to prevent contact between descending unconcentrated materialand ascending treated, material, scoops-attached to and rotatable with said guide casing and adapted to elevate and discharge tailings and gangues from said concentrating receptacle, means for rotating said guide casing about its axis, agitating means to prevent the formation of sediment in said concentrating receptacle, and means for oscillating said concentrating receptacle about-its'axis, substantially as shown and described.

'7'.- In combination, a concentrating receptacleconvergingfrom top to bottom mount- 7 ,ed' for oscillation upon an inclined axis,i.a

guide-casing mounted upon an inclined axis above and partly within said concentratingreceptacle and concentric therewith, said guide casing being adapted to discharge material for concentration centrally above the bottom of said'concentrating receptacle but below thedischarge leveluof the tailings and gangues therein, controllablemeans'for discharging concentrates from the] bottom v of said receptacle, and means for vibrating said concentrating receptacle about-itsax-is, substantially as shown and described.

-8. In'combination, a concentratingreceptacle converging from top to bottom mounte'd for oscillation upon aninclinedaxis,-a

guide casing mounted above and partly "within said concentrating receptacle concentric therewith and upon-an inclinedv axis, saidguide casing being adapted to discharge material for concentration central-ly above the bottomof said concentrating receptacle l but below the discharge l'evelof the't'a'il-ings and gangues therein, controllable means for discharging concentratesfrom the bottom of said receptacle, agitating means to prevent the formation of sediment in said concentrating receptacle, and means for vibrating, said concentrating receptacle about its axis, substantially as shown and described.

9. In combination, a sizing means mounted for rotation upon an inclined axis, a guide casing attached to and rotatable with said sizing means, a concentrating receptacle mounted concentric with said sizing means and its guide casing and upon an inclined axis, said receptacle partly inclosing said guide casing, means for oscillating said con centrating receptacle about its axis, and means attached to said guide casing adapted to elevate and discharge tailings and gangues from said concentrating receptacle,substan tially as shown and described.

10. In combination, a sizing means mounted for rotation upon an inclined axis, a con centrating receptacle mounted concentric with said sizing means and upon an inclined axis, a guide casing attached to and rotatable vith said sizing means and adapted to transfer material for concentration from said sizing means into said concentrating receptacle, means attached to said guide casing adapted to elevate and discharge tailings and gangues from said concentrating receptacle, means for rotating said sizing means and guide casing about their axis, and means for oscillating said concentrating receptacle about its axis, substantially as shown and described. I

11. In combination, a sizing means mounted. for rotation upon an inclined axis, a guide casing attached to and rotatable with said sizing means, a concentrating receptacle mounted concentric with said sizing means and its guide casing and upon an inclined axis, said receptacle partly inclosing said guide casing, means for oscillating said concentrating receptacle about its axis, means for rotating said sizing means and guide casing about their common axis, means attached to said guide casing adapted to e1e vate and discharge tailings and gangues from said concentrating receptacle, and controllable means for discharging concentrates at the bottom of the concentrating receptacle, substantially as shown and described.

12. In combination, a sizing-means 1nounted for rotation upon an inclined axis, a guide casing attached to and rotatable with said sizing means, a concentrating receptacle mounted concentric with said sizing means and its guide casing and upon an inclined axis, said receptacle partly inclosing said guide casing, means for oscillating said concentrating receptacle about its axis, means for rotating said sizing means and guide casing about their common axis, means attached to the said guide casing adapted to elevate. and discharge tailings and gangucs from said concentrating receptacle, controllable means for discharging concentrates at the bottom or" said concentrating receptacle, and agitating means to prevent the formation of sediment in said concentrating receptacle, substantially as shown and described.

13. In combination, a concentrating receptacle mounted for oscillation upon an inclined axis and having its bottom pierced to form a plurality of concentrates discharge outlets, a guide casing mounted concentrically above and partly within said concentrating receptacle and upon an inclined axis, said guide casing being adapted to deliv into said concentrating receptacle, a sizing means mounted for rotation upon an inclined axis concentrically within-said guide casing and attached thereto, said sizing means being constructed to wash and dis sociate coarse and fine material, a feed hopper mounted upon an inclined axis above and partly within said sizing means and adapted to deliver Water and material for separation thereinto, meansattached to said guide casing adapted to elevate and discharge tailings and gangues from said concentrating receptacle, controllable means for discharging concentrates at the bottom of said concentrating receptacle, agitating means to prevent the formation of sediment in said concentrating receptacle, means for rotating said sizing means and guide casing about their common axis, and means for oscillating said concentrating receptacle about its axis, substantially as shown and described.

In testimony whereof I have signed my name in the presence of two subscribing wit nesses.

U. M. Benson, M. W. MEADOWS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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