US1097113A - Concentrator. - Google Patents

Description

A. R. WILFLEY.

ooNoENTRAToR. APPLICATION EILBD FEB. 3, 1912.

Patented May 19, 1914;

5 SHEETS-SHEET 1.

COLUMBIA PLANOGRAPH co..wAsHlNL`1ToN. DJG.

A. R. WILFLEY.

GONGENTRATOR.

APPLICATION FILED FEB. 3, 1912.

'Patented May y19,1914

5 SHEETS-SHEET 2.

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A. R. WILPLEY.

GONGENTRATOR.

APPLICATION FILED IBB. s, 1912.

1409"?,1 1 3, i Patented May 19, 1914.V

A. R.' WILFLBY.

GONCENTRATOR. APPLI'CATION FILED 1311.3, 1912.

1,0971 13, i Patented May 19, 1914.

5 SHEETS-SHEET 4.

COLUMBIA PLANOGRAPH col. WASHINGTON. D. c.

AfR. WILPLEY.

GONUENTRATOR.

APPLIUATJON FILED rnB.a,1912.

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ARTHUR R. WILFLEY, OF DENVER, COLORADO.

CONCENTRATOR.

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To aZZ 'whom 'it may concern Be it known that l, ARTHUR R. YWinrrnr, citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful improvements in Concentrators; and l do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being` had to the accompanying drawings, and to the characters ot reterence marked thereon, which form a part of this specilication,

My invention relates to improvements in concentrators, of the general construction set forth in my previous application, Serial No. 606,196, led February 2, 1911; now Patent No. 1,021,961, granted April 2, 1912-; and also my application Serial No. 656,318, tiled Ueteber 23, 1911, now Patent No. 1,056,388, granted March 18, 1913.

ln my improved apparatus, tiltable tables are employed, each containing a plurality ot decks. These tables while at their upward limit ot movement are slightly inclined rearwardly, forming a sort of'pocket, whereby the pulp is caused to accumulate upon the decks of the tables during the early part of the treatment of the charge, provision being made for subsequently tilting the tables gradually at first and later more abruptly. The final tilting movement coperates with an additional supply of water to discharge the concentrates from the tables.

ln my improved construction, the downward movement ot the tables, by virtue ofl a suitable connection between a valve and the tables, opens the valve to permit an additional supply of wash water to facilitate the rapid removal of the concentrates while the table is at its downward limit of movement, or at its greatest inclination.

Another feat-ure ot novelty consists in the employment of a deiiector controlled by a cam, which operates in harmony with another cam for controlling` the movement ot the tables. rlllie first named cam serves to actuate the deiector, whereby the pulp Vis directed upon the table as it is raised to its upward limit of movement, and cut ofi' from the other table.

Other features of novelty embraced in my present improvement. will'be fully set forth in the detail description. Y

Having briefly outlined my improved con- Speccaton of Letters Patent.

Application led February 3, 1912.

Patented lliay 19, 1914.

Serial No. 675,302.

struction, I will proceed to describe the same in detail, reference being made to the aecompanying drawing, in which is illustrated an embodiment thereof.

ln this drawing: Figure 1 is a central vertical section taken through the apparatus on the line 1 1, Fig. 7 Fig. 2 is a detail view on a larger scale, illustrating a trough construction for supplying` water to the tables, and showing` one of the automatically operated valves employed in connection therewith. This may be termed a section taken on the line 2 2, Fig. 7, viewed in the direction of the arrow. Fig. 3 is a section taken on the line 8 3, Fig. 7, looking toward the left. Fig. -t is a detail view, illustrating the manner of pivotally mounting the tables. This is a view looking in the direction of arrow e, Fig. 5. Fig. 5 is a section taken on the line 5 5, Fig. 3, the parts being shown on a larger scale. Fig. 6 is a section taken approximately on the line 6 6, Fig. 1. Fig. 7 is a top plan view ot the` apparatus with parts removed. It is also a section taken on the line 7 '7 Fig. 1, looking downwardly. Fig. 8 is a top plan view of t-he construction, partly in section, with parts removed from above for the purpose of more clearly illustrating the manner of pivotally supporting the two table members.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a suitable frame work, which extends upwardly and forms the support forr the mechanism for discharging pulp and wash water upon the tables. This apparatus includes two troughs 6, the said troughs .being supplied with water from a conduit 7, which discharges into a trough member 8 communieating with the troughs 6 by diverging branches 9. Mounted above the water supply, troughs, or launderst, and arranged transversely thereof, are two bars 10, upon which rest the opposite ends kof a pulp detlector 12, which is V-shaped, in cross section and adapted to alternately feed the pulp to the two table members 13, as hereinatter more fully described.

A pulp distributor 14 is mounted above the deflector, the distributer being Stationary. When the detlector is in the position shown at Fig. 1, viz., the farther toward the lett, the pulp from the discharge board, or plate 15, passes to the inclined surface 16 of the deflector, and thence into the subdivider 17, for carrying the pulp to the various decks 18 of the table farther toward the right, the said table being at its upward limit of movement and slightly rearwardly inclined, or tilted toward the longitudinal center of the apparatus, whereby a quantity of pulp will accumulate upon the various decks of the table before any can escape from the forward edges of the said decks. This accumulation of pulp upon the table decks when the table is at its upward limit of movement, is indicated by dotted lines 19, in Fig. 1.

As illustrated in Fig. 1, the table 13, to-

ward the left, is at its downward limit of movement. New, when this table member is raised, the deflector will be shifted from the full line position in Figs. 1 and 2, to the dotted line position in Fig. 3, whereby the pulp from the distributer will fall upon the opposite inclined surface 2O of the deiiector, whereby the pulp will fall into the sub-divider 17 of the table 13 farther to the left in Figs. 1 and 3.

The mechanism for accomplishing the shifting of the deflector, will now be described: An eccentric cam 21 is mounted on a longitudinally disposed shaft 22 journaled at its opposite ends in the lower part of the frame work, as shown at 23. This shaft carries a fast gear 24 which meshes with a pinion 25 fast on a shaft 26, carrying a worm-wheel 27 operated from a worm carried by a shaft 28, the last named shaft being actuated by a cone pulley 29 engaging'- a pulley 30 fast on the sha-ft 28. The cone pulley 29y is fast on a shaft 31, and is initially operated by connecting a pulley 32 thereon with any suitable motor. Upon the shaft 22, and near opposite ends thereof, are located two cams 21, each having a groove 33, which is engaged by a roller 34, pifvoted on the lower extremity of a relatively long lever 35, the latter being fulcrumed intermediate its extremities, as shown at 36, the fulcrum pin passing through the said lever and perforations formed in the bifurcated extremity 37 of a bracket 3S, secured to the frame work, as shown at 39. The upper extremities of the two levers 35 are provided with slots 40, which are engaged by pins 41, with which the opposite extremities of the deflector'12 are equipped. The slots 33 of thev cams 21, are so arranged with reference to the center of motion of the axis of the shaft 22, that when the cam is inthe position shown in Fig. 3, the lower extremities of the levers 35 will be moved toward the left a.- sufli'cient distance to cause the deiector 12 to occupy the full line position in Figs. 1 and 3. This condition will continue while the. cams are making approximately onehalf of a. revolution, after which the Vantifiiictional rollers 34, will enter the other porvter 14 will be caused to fall on the opposite inclined surface 20 of the deflector, and the pulp will be guided to the sub-divider 17 of the table member farther toward the left. (See Figs. l and 3.)

The inclination of the tables is controlled vby levers 42, fulcrumed at 43, and having anti-frictional rollers 44 engaging the irregular peripheral faces of cams 45, fast on the shaft 22. The lower extremities of the levers 42 are curved outwardly from the shaft 22, and are equipped with cups 46,

. adapted to receive the ball extremities 47 of rods 48, whose upper extremities 49 are The rods 48 are each combuckles 51, for convenience of adjustment.

TWhen the cam 45 is in the position illusti'ated in F ig. 1*, the table at the left is at its downward limit of movement, and the table at the right is at its upward limit of movement. .ln this event, the roller 44 of the lever 42 farther toward the left engages a recess, or depression, 52, formed in the face of the cam, the bottom of this depression being the point on the face of the cam nearest the axis of the shaft 22. In describing this operation, it is assumed that the cam 45 is traveling in the direction of the arrow in Fig. 1. From an inspection of the cain it will be understood that the roller 44 of the said lever, no sooner reaches the bottom of the recess 52, which recess occupies but a small part of the face of the cam, than it begins to leave said recess, being quickly forced outwardly to a part of the cam considerably farther from the center of motion. 7h-ile the said roller is traveling from the bottom of the recess 52 to a point 53 on the face of the cam, the table 13 on the left (see Fig. 1) will. be raised to its limit of upward movement, and will remain in this position while the cam is making approximately three-fourths of a revolution. In the meantime, however, the recess 52 of the cam, after having made approximately one-half ofr a revolution from the position illustrated in Fig. 1, will be in position to allow t-he roller 44 of the opposite lever to enter the said recess, thus allowing the table toward the right to assume its greatest position of inclinatien. It will thus be seen that both tables are fora considerable time simultaneously at their upward limit of movement.

. Vhen each table is at its upward limit of movement it receives water from one of the troughs, or launders, 6 only, and this wash water mingles with the pulp during the period of stratification, so to speak, or while the separation of the concentrates is taking place, by settling to the bottom of the quantity of pulp which has accumulated on the table. During the time that the pulp is being fed to a table, when the latter is at its upward limit of movementthe wash water from the conduit 7 is cut olf from the table by means of an oscillating gate 54, pivoted at 55, its outer extremity at 56 being adapted to alternately engage the opposite side walls of the receptacle 8. The opposite end of this gate is slotted, as shown at 57, to receive an extension 58.0f one of the pins 41 of the deflector 12, the said pin having an upwardly projecting portion entering the bifurcated extremity 57 of the gate, hence, as the dellector is shifted toward the left, (see Fig. 1) to cause. the pulp to enter the sub-divider 17 of the right hand table, the gate 54 is shifted to out off wash water from the right hand launder 6, which supplies the right hand table, allowing all of the water from the conduit 7 to pass to the launder 6 which supplies the left hand table. At the same time, the left hand table, which is in the lowermost position, receives an additional supply of wash water from an aux.

iliary launder 59, which is composed of two members 60, arranged parallel with the launders 6, but farther from the longitudinal center of the machine, the two launder mem bers 60 being connected at one end by a transverse member 61. This auxiliary launder 59 is constantly supplied with wash water from a conduit 62 arranged at one end of one of the launder members 60. Each of the launder members 60 is provided with two valves 63 which control openings 64, forming communication between the launder members 60 and the launders 6. These valves close by gravity, being of sufficient mass for the purpose. Each valve is connected by means cfa link 65 with a lever 66, fulcrumed at G7, the arm of the lever remote from the valve, being connected with one extremity of a chain 68, the opposite extremity of the chain being connected with a table member, Vas shown at 69. Normally, or when the table are at their upward limit of movement, these valves are closed, whereby the water from the auxiliary launder 59 is cut olf from the launders G. TWhen, however, either table is tilted, these valves 93 of the launder member 60 on the side where the tilted table is located, are opened to allow the water from the launder 69 to enter the launder 6, whereby an increased amount of wash water is discharged upon the decks of the tilted table to facilitate the removal ofthe concentrates therefrom. However, as soon as Ythe table has moved upwardly a short distance, the chains G8 slacken, and the valves 63 seat themselves by gravity, and cut olf the excess supply of wash water to the launder 6.

Each table is provided on each side with a plate 70, which is secured to the table by means of bolts or other suitable fastening devices 71. Each of these plates carries a conical journal 72, which engages a bearing 7 3 of counter-part shape, adjustably mounted on one extremity of a bar 74, the said bar connecting the two tables, there being one of these connecting bars at each end of the table structure. The bearing member 7 3, includes a plate member 75, which is connected with the bar 74 by bolts 76, the said bolts passing through slots 77 formed in the bar; the bearing member 73 passes through a relatively large opening 7 S formed in the bar. By virtue of this construction, the bearings for the journals 72 are adjustable longitudinally of the bar 74, which is necessary or highly advantageous in assembling the structure.

A rod 79 passes between the two tables in a lengthwise direction and passes through openings 80 formed in the centers of the two bars 71. At one extremity, this rod is connectedwith the bar by a nut S1, while at its other extremity, the rod is threaded, as shown at V82, and extends beyond the bar, where it is connected vwith a ball cup member 83, cooperating with a similar member Sli, the two members 'being secured together by bolts S5 and forming a bearing for the ball extremity 86 of a pitman 87 connected with a strap' 88 of 'an eccentric 89 mounted on the shaft 81, which imparts the transverse vibration of reciprocatory movement to the two table members. This movement is simultaneously impartedr to both tables through the agency kof the rod 79. In order to make the bars 71 connecting the two tables, as aforesaid, substantially rigid, the tables are reinforced on opposite sides of the tables at the center of each bar by blocks 90, which'iill the space between the bars and the tables, since the bars are held at some distance from the tables by virtue of the bearing construction for their journals 72. a

The tables are movablysupported from underneath by elongated bearings 91, formed on the frame work, the said bearings having grooves length-wise of the bearings, in which are located removable blocks 92, secured in placevby bolts or other suitable fastening devices, 93; these blocks are grooved to receive wearing members 94, which are semi-cylindrical in shape andvopen at the top to receive elongated projections 95, which are formed integral with plates 95, secured to the under surface of the lowermost Ydeck of each table, as shown at 97. The ywearing parts 94 are closed at their ends,

and the projections 95 fit closely therein, so that during the longitudinal reciprocation of the tables, the wearing parts move with the pro-jections. Attention is called to the fact that this construction for supplying the tables, acts in harmony with the journal bearing construction arranged at the ends of the tables, as heretofore described. 1n other words, the axis of the journal 7 2, is coincident with the center of motion of the tables on the supporting structure underneath, as heretofore described.

As illustrated in the drawing, provision is made for receiving the discharge of the gangue and concentrates when the tables are tilted. This construction includes two troughs, or receptacles, arranged on opposite sides of the structure. The outer trough 98, on each side, is arranged to receive the concentrates, while the inner trough 99, is adapted to receive the gangue. rlhese two troughs virtually compose a receptacle divided into two compartments by a partition 100. Supported by upwardly extending parts 101 and 102, is a stationary receptacle 103, provided at its bottom with a discharge nozzle 104:, upon which is pivotally mounted, as shown at 10G, a member 105, which is arranged to oscillate so as to discharge into either of the compartments 9S or 99, as may be desired. Each oscillating member 105, is pivotally connected, as shown at 107, with a relatively long arm 108, vwhich extends inwardly toward the center of the machine, and is pivotally connected at itsinner extremity, as shown at 109, with a lever arm, 110,V carrying a roller 112 engaging an eccentric groove 113 in a cam 114, fast Von the shaft 22. The upper extremity of the lever arm 110, is pivotally mounted on thek frame work, as shown at 115.

The construction of the cam 114 is such that during the operation of the machine, the oscillating member 105 is shifted to discharge the concentrates from each tableinto the compartment 98, and to discharge the gangue into compartment 99 on each side of the structure.

From the foregoing description, the use and operation of my improved construction will be readily understood.

Assuming that the tables are in the relative position illustrated in Figs. 1 and 3, the operation may be described as follows: The concentrates have just been discharged from the left hand table, since the latter is at its downward limit of movement, the said concentrates passing into the concentrate compartment 98 while the table on the right, which is at its upward limit of movement has its rear side, or that nearer the center of the structure, slightly below its outer or discharge side, and by virtue of this .ar-

rangement, the pulp will accumulate on each Y deck of the table, as indicated by the dotted lines 19, until the depth is sufficient to permit an overflow at the discharge side of the decks. During this accumulation, the metallic values under the inliuence of the vibration to which the table is subjected, as heretofore described, will settle on the upper surface of the decks, while the gangue, or worthless material, will remain in suspension in the water, and as soon as the overflow commences, the gangue only, will be discharged. This gangue discharge will continue during the first or initial tilting movements of the tables; the gangue, however, is quickly discharged, since it is held in suspension by the water, and as the table continues its tilting action, the valves 63 in the auxiliary launder will be opened, whereby the water from the auxiliary launder is allowed to enter the launder 6 on the correspending side of the machine, whereby an additional quantity of water will be discharged through the outlet pipes or chutes 116, which lead from the perforations 117 in the bottom of each launder 6. This excess of water cooperates with the inclination of the table to quickly remove the concentrates from the decks of the latter, after which the table by virtue of the cams 15 and the connections between the cams and the table, as heretofore described, will be quickly raised to the normal position, or that shown at the right in Figs. 1 and 3, whereby the accumulation of pulp upon the various decks commences. Simultaneously .with the elevation of the table to its upward limit of movement, the deflector 12 is automatically shifted through the instrumentality of the lever 35 and the cam 21, whereby the discharge of pulp from the distributer will be cut olf from one table and discharged upon the other. Furthermore, as soon as the deflector is shifted from the full line position to the dotted line position (see Fig. 3), whereby, the pulp is caused to discharge upon the left hand table, the gate 54 is automatically actuated to cut olf the supply of water to the table on the left, and direct the wash water to the table on the right, whereby, this water is utilized for separating the concentrates from the gangue, and inally in conjunction with the additional supply received from the auxiliary launder, serves to facilitate the discharge of the concentrates from the table when the latter is tilted to the'desired inclination, as heretofore explained. Y

1n further explanation of the operation of my improved construction, it may be stated that the tables may be said to occupy three positions, viz., a rearward inclination and two forward inclinations. The rearward inclination is occupied by the table during the greater portion of the time, be-

ing the time during which the pulp is fed to the table, and while the stratiiicationof the material is taking place upon the table,

whereby the metallic values are caused to settle upon the concentration faces of the decks. During the rearward inclination of the table, or the position of the latter when its side adjacent the center of the machine is lowermost, the mineral values under the influence of the longitudinal reciprocation, or vibratory movement of the table, not only settle upon the faces of thedecks, but also travel rearwardly thereon, whereby when the table is given its initial forward inclination for the purpose of removing the gangue, the mineral values are so far in the rear that they are prevented from escaping with the gangue.

Attention is called to the fact that the rear side of the table is closed against the escape of either gangue or concentrates. After the material has been stratified upon the table during its rearward inclination, as heretofore explained, and the feed of the pulp to the table has been cut off, the table assumes its first position of forward inclinat-ion, viz., during the time that the cam 45 is traveling from the po-int A to the point o B in contact with one of the rollers 44 of a lever 42.A During this time the gangue is discharged from the table, sinceit is held in suspension by the water and readily escapes from the concentrates which are heaviest and form an approximately solid mass in direct contact with the faces of the decks. After this discharge of the gangue, and during the time that the cam 45 is traveling from the point B to the bottom of the recess 52 on the face of the cam in contact with one of the rollers 44, the table drops to its downward limit of movement, whereby it assumes its position of greatest inclination. It is during this time that the excess of wash water, due to the opening of the valves 63 of the launder members 60, occurs, the increase of wash water coperating with the increased inclination of the table to facilitate the discharge of the concentrates, the concentrate discharge being completed while the table is in its lowermost position, or its position of greatest inclination. As the cam 45 continues its movement in the direction of the arrow (see Fig. 1), it quickly travels in contact with o-ne of the rollers; 44 from the bottom of the recess 52 to the oint 53 on the face of the cam, during which time the movement of the table just described has been reversed, and thelatter is returned to its position of rearward inclination, whichV position it retains while the cam 45 is traveling from the point 53 to the point A in contact with the roller 44 of the lever 42, which regulates the position of the table in question. When 'the rod 79 is applied to the bars 74,`and fastened by the nut 81, the said bars are placed under tension by the Vapplication nof the nut.

This feature, together `with the blocks 90, causes thev tabl/esto be reciprocated inperfect unison, since the force employed in impart-ing the reciprocating movement is distributed throughout the entire length of the bars 74, the said bars being connected with the tables with reference to the center of gravityV of Vthe lat-ter, whose rear sides, or the sides adjacent the center of the machine, are heaviest.

VBy virtue of the construction described, for imparting the longitudinal reciprocation to the tables, the latter are maintained at all timesin their normal operative positions, whereby all tendency to torsional strain, which would result from applying the power, in a less advantageous manner is overcome.

Having thus described my invention, what l claim, is:

l. The combination of a tiltable concentrating table, closed at its rear side and open at its opposite side for discharge purposes, and means for automatically tilting the table for two positions of successively greater inclination in a forward direction for t-he purpose of discharging the gangue and concentrates, respectively, and in the order named, and then reversing the tables movement, and finally tilting it rearwardly to permit the accumulation thereon of a charge of pulp, and means for supplying pulp to the table during the period of rearward inclination, substantially as described.

2. The combination of a tiltable concentrating table, closed at its rearward side and open at its opposite side for purposes of gangue and concentrates discharge, means for automatically tilting the table to two positions of successively greater inclination in a forward direction and then reversing the tables movement, and finally tilting itv rearwardly to permit the accumulation of a 'charge of pulp thereon, means for supplying pulp during the period o-f rearward inclination, and means for cutting olf the pulp during the period of forward inclination, substantially as described.

3. The combination of a tilt-able concentrating table, closed at its rear side and open at its opposite side for purposes of gangue and concentrates discharge, means for automatically tilting the tableto two positions of successively greater inclination in a forward direction, and then reversing the tables movement, and nally tilting it rearwardly to permit the accumulation of a charge of pulp thereon, means for supplying pulp during the period of rearward inclination, means for cutting olf the pulp during the period of forward inclination, and meansffor supplying wash water during the period of forward inclination.

4. The combination of a tiltable concentrating table, closed at its rear side and open at its opposite side for purposes of gangue and concentrates discharge, means for automatically tilting the table to two positions of successively greater inclination in a. forward direction, and then reversing the tables movement, and finally tilting it rearwardly to permit t-he accumulation of 4a charge of pulp thereon, m-eans for supplying pulp during the period of rearward inclination, means forY cutting` off the pulp during the period of forward inclination, means for supplying wash water during the period of forward inclination, and means for cutting olf wash water during the period of rearward inclination.

5. The combination of a tiltable concentrating table, closed at its rear side and open at its opposite side for discharge purposes, means for tilting the table to two positions of successively greater inclination in a forwarddirection for discharging the gangue and concentrates, respectively, in the order named, and then reversing the tables movement, and finally tilting it rearwardly to permit the accumulation thereon of a charge of pulp, means for supplying pulp during the period of rearward inclination, means for cutting off the pulp during the period of forward inclination, means for supplying wash water during both periods of forward inclination, and means for supplying an additional volume of wash water during the period of greatest inclination.

6. The combination of a tiltable concentrating t-able, closed on its rear side and open at its opposite side for discharge purposes, means for automatically tilting the table to positions of successively greater inclination in a forward direction for the purpose of discharging the gangue and concentrates therefrom, in the order named, and then reversing the tables tilting movement, and finally tilting it rearwardly to permit the accumulation thereon of a charge of pulp, means for supplying' pulp to the table during its period of rearward inclination, means for cutting off the supply of pulp from the table during the periods of forward inclination, means for supplying wash water to the table simultaneously with the cutting off of t-he pulp therefrom, and means for automatically increasing the supply of wash water during the last period of forward inclination, for the purpose set forth.

7. The combination of a -tiltable concentrating table, closed at its rear side and open at its opposite side for discharge purposes, meansl for tilting the table longitudinally to positions of successively greater inclination in a forward direction, and then reversing the tables movement, and finally tilt-ing it longitudinally rearwardly to permit the accumulation thereon of a charge of pulp, and means for imparting a transverse reciprocating movement to the table.

8. The combination of a longitudinally tiltab-le concentrating table, closed at its rear side and open at its opposite side for purposes of gangue and concentrates discharge, means connected with the table to tilt the latter to a posit-ion of rearward inclination and to two positions of successively forward inclination and maintain the inclinations for predetermined periods, means for supplying pulp during the period of rearward inclination and for cutting off of pulp during the period of forward inclination, and means for supplying wash water during the two periods of forward inclination.

9. The combination of a tiltable concentrating table, al cam having three faces, means connected with the table and bearing upon said cam, the faces of the cam being proportioned to tilt the table to a position of rearward inclination, and two positions of successively greater forward inclination and maintain the inclinations for predetermined periods, means for supplying pulp during the period of rearward inclination and for cutting off the supply of pulp during the periods of forward inclination, and means for supplying wash water during the two periods of forward inclination.

10. The combination of a tiltable concentrating table, a cam having three faces, means connected to the table and bearing upon said cam, the faces of the cam being proportioned to tilt the table to a position of rearward inclination and two positions of successively greater forward inclination and maintain the inclinations for predetermined periods, means for supplying pulp during the period of rearward inclination and for cutting olf the supply of pulp during the two periods of forward inclination, and means for supplying water during the two periods of greater inclination, the relative lengths of the three faces being such that the time during which the table is maintained in the position of rearward inclination is relatively long, while the times during which it is maintained in the two positions of forward inclinations are relatively short.` and approximately equal.

ll. The combination of a tiltable concentrating table, V'means connected with the table to tilt the latter to a position of rearward inclination and two positions of successively greater forward inclination, and maintain the inclinations for predetermined periods, means for supplying the pulp during the period of rearward inclination and for cutting off the supply during the period of forward inclination, means for supplying the table with wash water during the two periods of forward inclination, and means connected with the table and acted on by the latter during its last position of forward inclination for automatically increasing the supply of wash water to the table, substan tially as described.

l2. The combination of a tiltable concentrating table, a cam having three faces, means connected with the table and bearing upon said cam, the faces of the cam being proportioned to tilt the table to a position of rearward inclination and two positions of successively greater forward inclination, the faces of the cam varying in length, and their relative lengths being such that the table is maintained in the first position relatively long, and in the second and lthird positions relatively short, lmeans for supplying pulp during the period of rearward inclination, means for cutting off the supply during the periods of greater inclination and means for supplying water during two periods of forward inclination.

13. The combination of a tiltable concentrating table, closed at its rear side and open at its opposite side for purposes of gangue and concentrates discharge, a cam having three faces, a connection between the cam and the table, the faces of the cam being proportioned to tilt the table to a position of rearward inclination and two positions of successively greater inclination and main tain the inclinations for predetermined periods, and having actuating means timed to harmonize with the tilting means for supplying pulp to the table .during the period of rearward inclination, and for cutting off the supply during the periods of forward inclination, and means for supplying wash water during the periods of forward inclination.

In testimony whereof I aHiX my signature in presence of two witnesses.

ARTHUR R. WILFLE Y.

lVitnesses:

A. J. OBRIEN, A. EBERT OBRIEN.

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

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