US763783A - Concentrating-table. - Google Patents

Description

PATENTED JUNE 28, 1904.

5 SHEETS-SHEET 1.

G. A. ovERsTRoM. GONGBNTRATING TABLE.

APPLICATION FILED DEO. 3. 1900.

Tn: Noam: Pzces cu. pHoro-uma.. wAsNwm-omp c.

, No MODEL.

No. 763,783. PATENTED vJUNE 2a, 1904. G. A. ovBRsTRoM.

CONCENTRATING TABLE,

APPLIOATION FILED Dnc. 3, 1900.

No MODEL. 5 SHEETS-SHEET 2.

E R E MZ? f6? www@ PATENTED JUNE 28, 1904.

G. A. OVERSTROM.

CONGENTRATING TABLE.

APPLIOATION FILED DBO. 3, 1900.

Y KW w Nw N0 MODEL.

PATENTED JUNE 28, 1904.

G. A. VERSTROM. ONGENTRATING TABLE.

APPLIOATION FILED DEO. 3, 1900.

5 SHEETS-SHEET 4.

SZW/62%?? @d N0 MODEL.

No. 763,783. PATBNTED JUNE 28, 1.9.04. G. A. OVERSTROM.

GONGENTRATING TABLE.

. APPLIUATION funn Dnc. a, 1900. No MODEL. e sanne-SHEET 1s.v

Patented June 28, 1904.

, PATENT OFFICE.

GUSTAVEA. OVERSTRGM, F ANACONDA,l l\/ION'l`Al\TA.

CONCENTRATING-TABLE.

SPECIFICATION forming part of Letters Patent ^N0. 763,783, dated June 28, 1904.

Application [ilcr December 3, 1900. Serial No. 38,435. (No model.)

To ((,ZZ wil/0711, t muy concern:

Be it known that I, GUsTAvn A. OvERsTRoM, a citizen of the United States, residing at Anaconda, in the county of Deerlodge and State of Montana, have invented a new and useful Concentrating-Table, of which the following is a speciiication.

This invention relates to concentrating-tables.

The object of the invention is to provide a construction and arrangement of concentrating-tables for ores, minerals, and thelike and operating means therefor which is sim` ple and eHicicnt.

A further object of the invention is to provide a construction of concentrating-table and operating means therefor wherein the motion of the table under the iniiuence of its actuating means is diagonal with respect to the table.

A further objectof the invention is to provide means whereby the movement of the table in one direction consumes less time than its movement in the opposite direction.

A further object of the invention is toprovide an arrangement ofconcentrating-table in which the table is adjustable W'itli reference to its line of movement.

A further object of the invention is to provide means for adjustably regulating the lateral tilt or inclination of the table.

Other objects of the invention will appear more fully hereinafter.

The invention consists, substantially, in the construction, combination, location, and arrangement of parts, all as will be more fully hereinafter set forth, as shown in the accompanying drawings, and finally pointed out in the appended claims.

Referring to the accompanying drawings and to the various views and reference-signs appearing thereon, Figure 1 is a plan view of ancre-concentrating table and its operating mechanism embodying the principles of my invention. Fig. 2 is a front end elevation. Fig. 3 is a rear end elevation. Fig. 41s a side elevation. Fig. 5 is a longitudinal central section. Fig, 6 is a transverse central section. Fig. 7 is a diagrammatic plan view. Fig. 8 is a view similar to Fig. 7. Fig. 9 is a broken detail view in section, showing an arrangement of riffles embodying the principles of my invention. Fig. 10 is a similar view showing a modified arrangement of rif- Hes. Figfll is a view similar to Figs. 9 and 10, illustrating another modified form of rifiies embodying the invention. Fig. 12 is a broken detail view, in horizontal section, showing the means for adjusting the table relative to the line of reciprocation thereof. Fig. 13 is a broken detail view in section, showing a construction of roller bearing or support for the table. Fig. 14 is a broken detail view in section of the actuating mechanism for the table on the line 111 111, Fig. 5. Fig. 15 is a detached detail viewin perspective of the swinging link employed in connection with the actuating mechanism. Fig. 16 is a broken detail view in plan of the upper corner of the table, showing the feed-box. Fig. 17 is a broken detail view in section on the line 17 17, Fig. 1, looking in the direction of the arrows. Fig. 18 is a similar view on the line 18 18, Fig. 1. Fig. 19 is a diagrammatic plan View illustrative of features which are avoided in my invention. Fig. 2O is a broken detail view in section, showing a special arrangerment of bearing-support for the table involving the principles of my invention. Fig. 21 is a View in plan similar to Figs. 7 and 8, but on an enlarged scale, of a concentrating-table embodying my invention. Fig. 22 is a detail view in section on the line t2 a2, Fig. 21. Fig. 23 is a central vertical sectional view `through the operating mechanism, taken longitudinally with respect to the operatingshaft.

The same part is designated by the same reference-sign wherever it occurs throughout the several views.

In the operation of separating' mineral from ore it is the usual custom to crush the ore to a desirable degree of fineness and then placing the crushed ore, either with or without first subjecting the same to hydraulic or other sizers by which the crushed ore is separated or divided, according to thc size of f the par` ticles thereof, upon a table or other machine for separating the mineral from the gangue or barren rocl. The present invention relates particularly to a machine or table for thus separating and concentrating the crushed ore.

Before entering upon a detailed description of the construction and mode of operation embodying my invention I will first direct attention to different objectionable defects in machines of this character which my invention is designed to overcome, reference being had to the diagrammatic view shown in Fig. 19, which illustrates one of the most successful forms of concentrating-tables at present in use. In this form of concentrating-table the ore is fed-to the table or the ore-box, (indicated at P,)and by reason of the lateral inclination of the table and the force or power employed in the delivery of the ore to the table such ore is carried down a short distance in the direction indicated by the arrow a. A reciprocatory motion is imparted to the table in the direction and along the line indicated by the arrow at By reason of this reciprocatory movement the particles of ore are moved toward the rear end D A of the table, the reciprocatory movement imparted to the table being parallel with the side A B of the table. During this travel of the particles of ore toward the delivery or rear end D A of the table due to the reciprocatory movement of the table such ore is subjected to the action of wash-water supplied from a suitable box or other receptacle or source, (indicated at QJ and which wash-water traverses the table laterally in the direction indicated by the arrows c. This wash-water tends to carry the particles in a direction transverse with respect to the line of reciprocation of the table. Thus the particles of ore, gangue, and the like are subjected to forces operating thereon in intersecting lines, and hence Linder the well-known law of components of forces the particles will be carried in a diagonal direction E F and G H. By reason of' its lightness as compared withthe ore thc rock` 1s carried by the wash-water farther towardl the side A B of the table than the mineral, and by reason of its greater weight the mineral is carried by the reciprocatory movement imparted to the table until such mineral is finally delivered over the end of the table along the line yH A into a receptacle R, and the barren roch or gangue, called tailings, is carried over the side of the table between the points J F. Middlings, so called, but which in this case are mostly free particles of mineral and tailings, are carried over the lower edge of the table between the points A J. It has been the usual custom to p rovide a suitable elevator for the table to return these middlings again to the feed-box for retreatment. I have found that middlings proper and comprising mineral and rock hanging together are also deposited with the middlings, so called, above referred to, and are returned by the elevator for retreatment. It has been my experience in practice that middlings proper, as above defined, and from which the mineral is not separated by retreatment upon the table continue to accumulate by continually returning the same to the table until finally the table is unable to take care of the same, and consequently these middlings proper are finally forced into the tailings and theV valuable mineral contained therein is wasted.

It is one of the purposes of my invention to provide means and an arrangement such that the middlings proper are efficiently separated by the table, so that they may be recrushed instead of merely being returned over and over again to the table, thus effecting a material saving in valuable mineral matter which has heretofore been wasted and lost, the recrushing of the middlings operating to free the particles of'Y mineral from the rock, and thus permitting separation thereof when fed upon the same or another table. Thus I contemplate not only saving and recrushing the middlings, but also propose to avoid the use of the additional machinery necessary for the middling-elevator.

Again referring to the diagram of Fig. 19, it will be seen that the particles of ore and rock or gangue begin their travel or progression toward the rear end of the table at a point diagrammatically indicated at E and then continue such progressive movement at least until they attain the point indicated at F. Consequently thespace E FB of the table is not utilized for any useful purpose, merely the dirty wash water owing thereover. Moreover, the space Gr D H is also wasted so far-as practical purposes are concerned, merely the fresh or clean water flowing thereover,` and the length of table, at the rear end of which the concentrates are carried, is too short for the purpose, hence resulting in an accumulation of more than the necessary amount of middlings, so called. and a material proportion of the concentrates Yare thus deposited in the receptacle which receives such middlings. Thus in the tables at present employed too much floor-space is taken up for the amount of work done, and it is one of the purposes of my invention to provide a construction wherein this objection is avoided and wherein the greatest amount of floor or space on the table is utilized in the performance of the work required of it, and to this end I providea table in whichthe waste space F E B of the tables at present in use is placed at another point (indicated by dotted lines at A K F) and the space H D G, which is vacant space,.as above explained, and not utilized for any useful purpose in the tables of ordinary construction, I place at the point indicated at G L C. Moreover, in the former construction of tables as above indicated and as illustrated in Fig. 19 the reciprocatory movement imparted to the table has been parallel with the IOO lower side of the table. The result of this arrangement, and particularly where the same rate of movement of the table in both directions is maintained, has been that but very little action or tendency is developed to move the mineral faster than the rock or gangue, except so far as the wash-Water acts as a holdback on the rock, which is lighter than the mineral, and not so much as a holdback on the mineral, which is heavier.

In carrying out my invention I propose to move the mineral forward or toward the rear end of the table at a greater rate of speed than the rock or gangue, and hence enabling the rock or gangue to remain a longer period of time on the table, and hence is subjected for a longer period of time to the action of the wash-water, thereby enabling the mineral and the rock to be separated more thoroughly and efliciently. To accomplish this result, I propose to employ a table of substantially diagonal or diamond shape in outline or having a concentrating area so defined and to impart a reciprocatory movement to the table about on the line E H of the diagram or parallel therewith or practically on a diagonal line with respect to the table-that is, on a line which is inclined with respect to the lower edge of the table. In this manner I avoid any vacant or waste space in the operating-surface of the table and I secure a longer distance at D Kto accommodate the concentrates.

Again referring to Fig. 19, in the prior construction nothing but waste water and tailings flows over the edge of the table between the points J B. This dirty water and tailings have usually been wasted. I have found, however, that this water and slime frequently contains as high as from two to three per cent., and possibly higher, of certain kinds of ore treated of valuable mineral which it is desirable to save. Therefore in carrying out my invention I propose to arrange a receptacle between the points F E to receive and retain this slime and dirty water and from which this mineral may be collected and saved.

Having now outlined generally some of the important features of improvement of my invention, I will now describe a specific construction and arrangement thereof embodying the principles of my invention, but to which, however, I do not desire to be limited or restricted, as many changes therein and variations therefrom would readily suggest themselves to persons skilled in the art and still fall within the spirit and scope of my invention.

Referring to the drawings, reference-signs 2l 22 designate a suitable frame upon which the operating parts of the machine are mounted. The sills 22 of the framing are arranged to extend parallel with respect to the line of -application of the reciprocatory movement hinged at one end, as at 24, and adjustably supported at its opposite end by a screw-rod 25 or in any other suitable or convenient manner. By suitably adjusting the screw support 25 the beam 23 may be readily adjusted vertically. Upon beam 23 and adjacent to the respective ends thereof are mounted boxes 26 27, in which is arranged to operate a rod or pipe 28, through which reciprocatory motion is imparted to the table. ed to the head endvof this rod is a connectingrod 29, said connecting-rod being pivotally connected at its other end to a sliding block, (indicated at 30, Figs. 2 and 14,) said block being ad justably mounted in a slot 3l in a pitman 32, adapted to be reciprocated from an eccentric or main operating shaft 33. Upon this shaft are mounted the usual fast and loose pulleys 34, adapted to receive rotation from any convenient source of power. In suitable boxes 35 are fulcrumed the crank-arms 36 of a swinging link 37, said link being provided with crank arms or pintles 38, pivotally connected or journaled in the pitman 32 about midway the length of the latter. If desired, the boxes 35, in which the links are fulcrumed, may be vertically adjusted to accommodate for wear or for other purpose by means of the wedge-blocks 39, as most clearly shown in Figs. 4 and 5.

By the construction of operating mechanism above 'described it will be readily seen that I not only provide means for imparting a reciprocatory movement to connecting-rod -29 and to operating-rod 28, but I am also enabled to vary the length of the stroke thereof and to secure a more rapid movement of said rods in one direction than in the other. Thus by adjusting the block 30 to a point in line with the point of pivotal connection of pintles 38 in said pitman I secure the same rate of speed of reciprocation of rods 28 and 29 in one direction as in the other, and by varying the point of adjustment of block 30 relative to the point of pivotal connection of arms 38 in pitman 32 I am enabled to vary the speed of reciprocatory movement of the operatingrods 29 28 in one direction with reference to the speed of movement of said rods in the opposite direction.v Thus I am enabled to readily secure the desired variation to accommodate any particular class or character of ore being treated. It is obvious that other constructions varying in the specific details thereof from the construction above described may be employed for securing the same object. I do not desire, therefore, to be limited to the specific details shown and described. The construction shown, however, I have found to be practical and admirably answering the desired purpose.

The table proper (indicated at 40) may bc constructed of the usual or any convenient or suitable material. Upon the under side of the table and at a point approximately at thc Pivotally connect- IOO IOS

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geometric center thereof is formed or secured a socket 4l, adapted to receive a pin or projection 42, formed with or attached to a sleeve 43, mounted upon rod 28 and held between collars 44. The pin or stud 42 forms a swivel connection between rod 28 and the table, whereby the table is permitted a swinging movement laterally or in a horizontal plane, and by reason of the sleeve 43 being mounted on rod 28 the table is permitted of a lateral tilting to secure the desired adjustments thereof, as will presently be explained more fully, while at the same time said pin-and-soclret connection affords means of attachment of the table to the rod 28, whereby reciprocations are imparted to the table when the rod 28 is reciprocated. If desired, a spring 45 may be interposed between guide-box 26 and a collar 46 on rod 28 to take up any lost motion or wear.

The table 40 may be held in any position of horizontal or swinging adjustment in any suitable or convenient manner, as by means of the screw-rod 47, and the object of this swinging or horizontal adjustment of the table about stud 42 as a pivot or axis is to properly adjust the inclination of the table relative to the line of reciprocation thereof, or rather to adjust the inclination of the lower edge of the table to such line of reciprocation, according to the quality or character of the ore being treated.

It is desirable to provide means for laterally adjusting or tilting the table. This lateral tilt or adjustment may be effected in many specifically diiferent ways. I have shown a simple and eflicient construction and arrangement for securing the desired result, but to which I do not desire my invention to be limited or restricted. In the construction shown I arrange the table to be supported at the upper and lower diagonally opposite cornersv thereof upon bearings (indicated at 48) carried by a support upon cam-sleeves 49, the cam-surfaces of which rest upon coperating cam surfaces or sleeves 50. The cam-sleeves 49 50 at the diagonally opposite corners of the table are adjustable relatively to each other and are arranged for independent or for cooperating or coincident adjustment. The independent adjustment at either corner of the table may be secured by means of a crankarm 51, connected to one of the cam-sleeves. These cam-arms operate over segment-plates 52. The crank-arms 5l may be held in any desired position of adjustment by means of the set-screw 53. rIhus by loosening the setscrew for one or the other of the crank-arms 52 and rocking said arm the desired independent adjustment of the diagonally opposite corners of the table may be effected. The coincident or simultaneous adjustment of the diagonally opposite corners of the table may be effected by means of crank-arms 54, respectively connected to the cam-sleeves 49 of supports 48, said crank-arms being connected together by connecting-bars 55, so that when said connecting bars are shifted the camsleeves 49 are simultaneously actuated, thus simultaneously adjusting the diagonally opposite corners of the table. It is obvious that the adjustment of one corner of the table may be an elevating adjustment and of the other corner a lowering adjustment, thereby quickly securing the desired tilt or angle of inclination of the working surface of the table.

The ore to be treated may be delivered upon the table from any suitable source of supply and in any suitable manner. I/Vhere such ore is delivered to the table from hydraulic sizers, I employ a feed-box 56 at the eXtreme upper corner of the table, said feedbox delivering to the surface of the table. I have shown said feed-box provided with short sections of delivery-pipes 57 through the bottom thereof and which extend nearly to the surface of the table, as most clearly shown in Fig. 17, for a purpose presently to be explained. I provide a rib or ange 58 to extend several inches above the top surface of the table along the upper edge thereof and the head end and to a point about midway the length of the lower edge, as most clearly shown in Fig. l, and adjacent to the feed-box I place one or more stops, (indicated at 59.) The purpose of this construction is to enable some of the tine mineral associated with the crushed ore and which is carried in suspension in the feed-water to settle upon the surface of the table by reason of the first rush of the water through the feed-box being arrested by the stop or stops 59 and the flange 58, thus permitting such fine mineral, which would otherwise be carried on into the waste or tailings of the ordinary construction, to become deposited or settle upon the surface of the table and to be carried by the combined action of the reciprocations of the table and of the wash-water. These are features of my invention which coperate with the arrangement shown and described, wherein the lower side of the table is diagonal or oblique to the line of reciprocation of the table, as provision of the stop or stops 59, and especially of the rib or flange 58, would be of no special utility if the lower side or edge of the table were parallel with the line of reciprocation of the table. This is an important and valuable feature of my invention, as thereby I am enabled to successfully treat ores of finer mesh than is possible otherwise. The wash-water may be supplied to the table-surface vin any suitable or convenient manner or from any convenient source. I have shown a receptacle or launder 60, loosely suspended in stirrups 61, carried by the gooseneck-supports 62, said gooseneck-supports being fastened to supporting-blocks 63,adjustably secured by means of lag-screws 64, operating through slots 65 in said blocks 63, whereby said blocks are se- IOO cured to a supporting-beam 21 of the frame of the machine. By this construction the wash launder or receptacle 60 may be readily moved or shifted endwise to conform to the requirements of the ore, and by adjustably supporting the gooseneck 62 upon the sills 21 said goosenecks may be suitably adjusted to accommodate the swinging or horizontal adjustment of the table, the loose suspension of the launder avoiding binding thereof during such swinging adjustment.

At the rear end of the table I arrange a suitable receptacle 66 to receive the concentrates, and along the lower portion of the lower edge of the table I arrange a suitable receptacle 67 to receive the wash and feed water and tailings, it being understood that the tailings are lighter than the mineral, and hence are carried farther by the action of the wash-water transversely across the table, and hence are delivered from the table over the lower edge thereof, while the mineral, being heavier, is carried farther and faster by the reciprocations of the table and is carried over the rear end of the table and delivered into the receptacle 66 as concentrates. The middlings, properly called, being heavier in weight than the tailings and lighter in weight than the mineral, are carried more nearly in a diagonal line and are delivered from the table at a point adjacent to the lower corner thereof, and hence at this point I arrange a receptacle 68 to receive the same and from which such middlings may be collected and recrushed before further treatment.

I have found in practice that it is desirable to build up a bed of ore on the surface of the table, which bed will serve the purpose of permitting some of the iine mineral to be covered by the gangue or tailings, thereby decreasing the liability of such iine mineral being carried over the lower edge of the table by the wash-water. To accomplish this result, I adjustably attach a strip 69 at the lower edge of the table and extending from the termination of Harige 58 to the lower corner of the table, as clearly shown, said strip projecting a decreasing extent above the top surface of -the table from the end of flange 58 to the corner. In this manner I am enabled to regulate the depth of the bed of ore on the table as desired, the depth of said bed being nothing at the extreme corners of the table and increasing in depth toward the head of the table, and by so providing and adjustably'regulating the depth of bed of ore on the table I am able to run the feed of material from the feed-box underneath such bed, and this is the purpose of the short pipe-sections 57, extending through the bottom of the feed-box 56 to a point in proximity to the top surface of the table. Thus the feed material carrying fine particles of mineral is delivered to the table underneath the bed of previously-introduced ore, the overiiowing bed of ore serving to hold or retain such line particles until they settle or become deposited upon the surface of the table. This feature of my iu- Vention is a most important and valuable one in the practical operation in devices of this character, as it results in eiecting a saving of a material proportion of mineral which is not saved by the ordinary construction.

In addition to the supports for the table afforded at 48, as above explained, said table may also be supported at other points-as, for instance, upon bearings 70. These bearings may be similar to the bearings 48, and, if desired, and as shown in Figs. l, 4, and 5, said bearings may consist of balls resting in seats provided therefor on the top of guide-boxes 26 27, thus not only forming bearing-supports for the table, but permitting the move'- rnents of the table above described.

In Fig. 13 I have shown a modified arrangement of bearing-support for the table and comprising a bracket 7l, suitably supported and having a seat to receive a ball or bearing 7 2 upon the table.

In Fig. 20 I have shown another form of bearing-support for the table which I have found effective and wherein is employed a rocking support 7 3, loosely journaled or stepped in a sleeve or case 74 and provided with a seat to receive a bearing or roller support 75, upon which the table rests. If desired, the step-sleeves 74 may contain a lubricant, as clearly indicated.

It is obvious that the construction shown in Figs. 13 and 2O may be employed at any desired point as a support for the table. The construction illustrated in Fig. 13 is shown as applied to the bearing for the table in the line of beam 23 and in thevicinity of a bearing-box for the operating-rod 28, the bracket 71 being arranged to straddle said box, while in Fig. 2O I have shown the bearing-support as applied at the diagonal corners of the table and wherein the adj Listing cam-sleeve 49 forms a support for the bearingsleeve 74. There roller-bearings are provided for thc table, said bearings should be curved on a radius struck from the axis of horizontal rotation or adjustment of the table, as indicated in dotted lines at 76 77, Fig. 7.

I have shown a portion of the table at its head end cut out at 78 in order to accommodate the operating mechanism. This portion of the table is not of material consequence and does not materially reduce the eective operating-surface of the table, inasmuch as the main operations of the table occur diagonally with respect thereto, and by omitting the portion which would otherwise iill the space indicated at 78 to accommodate the gearing I am enabled to shorten the space occupied by the table. If desired, however, this part of the surface of the table may be retained, as indicated in dotted lines at 79. (See Figs. 7 and 8*.)

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It is desirable to provide ample space between adjacent tables erected in the same room in order to permit ready movement of employees therebetween. In order to secure as much space for this purpose as possible, I may, if desired, omit the extreme upper corner of the table, as indicated at 80. If desired, however, t'his portion of the table may be retained, as indicated in dotted lines at 81.

It is usual to form the table of material which is impervious to water. The same result, however, may be obtained by lining or covering the top surface of the table with a suitable impervious material-such, for instance, as linoleum, sheet metal, waterproof, or the lileas indicated at 82. It is sometimes desirable to employ riii'les and arrange the same upon the upper surface of the table. These ril-lies form lags or holding projections for the ore and for the wash-water and aid in effecting the proper separation of the mineral from the gangue or barren rock. In cases where riflies are employed in connection with the table of my invention I prefer to so construct such riflies as to present an inclined upper surface, over which the ore and wash-wa ter may readily pass, and rearwardly-inclined lower surface and diminishing in height toward the tail end of the table. rIhis result maybe secured by suitably grooving or undercutting the top surface of the table 85, as indicated at 83, the top or upper surface 84 being inclined in the direction of liow of the wash-water, while the undercut portion 83 is rearwardly inclined with respect to the direction of flow of the water. (See Fig. 1l.) The same result may be obtained by providing flanged strips 86, suitably secured upon the top surface of the table 40 and inclined in the direction of the lower edge of the table, thus forming rearwardly inclined pockets 87. (See Fig. 10.) Similarly, the same result may be secured by means of strips 88, suitably secured upon the top surface of the table, (see Fig. 9,) said strips being inclined on the surface thereof, as indicated at 89, which is presented toward the direction from which the wash-water liows and are similarly inclined on the opposite side thereof to form similar pockets 90. (See Fig. 9.) If desired, the stops 59 may be similarly inclined, as clearly shown in Fig. 17. By such constructions and arrangements of the riflies the tailings are more readily and easily washed over the rif- Iies, and fine particles of mineral would become deposited or would settle in the pockets 83, 87, or 90, as the case may be, in which pockets the water flowing over the riflies forms an eddy or is not materially agitated by the flow of the wash-water, thereby permitting the particles of mineral to settle upon the surface of the table, and thus materially aiding in the separation of the mineral from the ore and adding to the material effective- 'marsa ness in practical use and operation of a table embodying my invention.

In Fig. 8 I have shown in diagrammatic plan a preferred arrangement of riftles, where such devices are employed, and wherein the riffles (indicated diagrammatically at 91) are arranged to extend from the head end of the table and from the lower edge thereof substantially parallel with the line of reciprocation of the table and said riflles respectively terminating on a diagonal line from the upper and lower corners of the table. By this arrangement of riflies in connection with'a table having its lower edge inclined relative to the line of reciprocation of the table it will be observed that the riliies are shorter in length toward the lower corner of the table.

It is believed that the operation of a concentrating-table embodying the principles of my invention, as above explained, will be readily understood and comprehended by persons skilled in the art when taken in connection with the foregoing description and the accompanying drawings.

It will be obvious that many variations in the details of construction and arrangement would readily suggest themselves to persons skilled in the art and still fall within the spirit and scope of my invention. I do not desire, therefore, to be limited or restricted to the exact details shown and described; but

Vhat I claim as new and useful and of my own invention, and desire to secure by Letters Patent of the United States, is-

1. A concentrating-table, in combination with means for imparting a reciprocatory movement thereto, said table having an unobstructed tailings-delivery edge, said edge being inclined away from the line of reciprocatory movement from the head end of the table toward the opposite end thereof, and riflles arranged in diagonal relation with respect to said table, as and for the purpose set forth.

2. A concentrating-table having parallel upper and lower edges, said lower edge forming the tailingsdischarge edge of the table and being unobstructed, and means for rectilinearly reciprocating said table in a line from the end of one edge to the diagonally opposite end of the other edge, as and for the purpose set forth.

3. A concentrating-table, in combination with means for rectilinearly reciprocating the same, the tailings-delivery edge of said table being unobstructed and throughout the length thereof inclined away from the line of rectilinear movement from the head end of the table toward the opposite end thereof, said reciprocating means operating to move the table faster in one direction than in the other', as and for the purpose set forth.

4. The combination with an operating-shaft having an eccentric, a pitman operated by said eccentric, swinging bearings for said pitman,

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in combination with a concentrating-table, and a rod directly connecting said table and pitman, whereby less time is consumed in the forward stroke than is consumed in the backward stroke, as and for the purpose set forth.

5. The combination with a drive-shaft, having an eccentric, a pitman operated by said eccentric, swinging bearings for said pitman, a receiving-table, a rod directly connecting said table and pitman, said rod being adjustable with respect to said pitman, whereby a reciprocatory movement is imparted to said table, such movement consuming less time in one direction than in the other, as and for the purpose set forth.

6. rJhe combination with a main drive-shaft having an eccentric, a pitman actuated by said eccentric, a swinging bearing for said pitman, a block mounted on said pitman for adjustment lengthwise thereof, a concentratingtable, and direct connections between said table and block, as and for the purpose set forth.

7. The combination with a main drive-shaft having an eccentric, a pitman actuated byfsaid eccentric, said pitman being longitudinally slotted, a swinging bearing for the free end of said pitman, a block adjustably mounted in the slot in said`pitman, a concentratingtable, and connections between said table and block, as and for the purpose set forth.

8. The combination with a main drive-shaft having an eccentric, a pitman actuated by said eccentric, a fulcrumed link pivotally connected to said pitman, aconnecting-rod adjustably connected to said pitman, a concen trating-table, and connections between said table and connecting-rod, as and for the purpose set forth.

9. The combination with a main drive-shaft having an eccentric, a pitman actuated thereby, a bearing-block, a link fulcrumed in said block and pivotally connected to said pitman, a concentrating-table, and connections independent oi said link between said table and pitman, as and for the purpose set forth.

10. The combination with a main driveshaft having an eccentric, a pitman actuated thereby, a bearing-block, means for adjusting said block, a link fulcrumed in said block and pivotally connected to said pitman, a concentrating-table and connections between said table and pitman, as and for the purpose set forth.

11. A concentrating-table, and means for rectilinearl y reciprocating the same, said table having a tailings-discharge edge inclined with respect to the line of reciprocatory movement of said table, and means for adjusting the position of said table to vary the degree of inclination of said tailings-discharge edge with respect to the line of reciprocation, as and for the purpose set forth.

12. A concentrating-table, and means for rectilinearly reciprocatingthe same, said table having a tailings-discharge edge inclined with respect to the line of reciprocatory movement of said table, in combination with swivel connections between said table and its reciprocating means to permit adjustment of said table to vary the angle of inclination of said tailings-discharge edge with respect to the line of reciprocation of said table, as and for the purpose set forth.

13. A concentrating-tablehaving a tailingsdischarge edge, and means for rectilinearly reciprocating said table on a line inclined with respect to said tailings-discharge edge, said means including a reciprocating rod, and swivel connections between said table and rod to permit the angle of inclination of said tailings-discharge edge relative to the line of reciprocatory movement of said table to be adjustably varied, as and for the purpose set forth.

14. A concentrating-table, and means for rectilinearly reciprocating the same, said table having a tailings-discharge edge inclined with respect to the line of movement of the table, said reciprocating means including a reciprocating rod, a casting carried by said rod and forming a pivotal support Jfor said table to permit of the lateral adjustment of said table to adjustably vary the inclination of said tailings-discharge edge relative to said line or' reciprocation, as and for the purpose set forth.

15. A concentrating-table, and means for rectilinearly reciprocating the same, said table having a tailings-discharge edge inclined with respect tothe line of reciprocatory movement of said table and riiiles upon the upper surface of said table and arranged to extend in the line of operation of said reciprocating means, said means including a reciprocatory rod, a casting carried upon said rod for movement therewith, said casting arranged to pivotally engage said table to permit of the lateral adjustment of said table to vary the inclination of said tailings-discharge edge with respect to the line of reciprocatory movement of said table, as and for the purpose set forth.

16. A concentrating-table having parallel sides and ends, and means for reciprocating said table on a line diagonal with respect to said sides, said means including a reciprocatory rod, a casting loosely sleeved upon said rod and carrying a stud arranged to engage said table, means for laterally tilting said table about said stud to vary the angle of inclination of the sides of said table relative to the diagonal line of reciprocation, as and for the purpose set forth.

17. A concentrating-table having a socket or seat at the axial center thereof, a rectilinearly-reciprocating rod for reciprocating said table, a stud carried by said rod and arranged to be received in said socket or seat, means for adjusting said table about said stud and IOO IIO

means for locking-said table in adjusted position, as and for the purpose set forth.

18. A concentrating-table having parallel sides and ends, and means for reciprocating said table in a line diagonal with respect to said parallel sides, in combination with bearing-supports upon which the upper and lower corners of said table rest, said supports being arranged respectively on opposite sides of said reciprocating means, and means for adjusting said bearing-supports to adjustably vary the tilt of the surface of said table, as and for the purpose set forth.

19. A concentrating-table having sides parallel with respect to each other, and means for reciprocating said table on a line diagonal with respect to said parallel sides, said means including an actuating-rod connected to said table, adjustable bearing-supports for the eX- treme upper and lower diagonal corners of said table, said bearing-supports being arranged respectively on opposite sides of said actuating-rod, and connections between said bearing-supports for simultaneously adjusting the same to vary the inclination or tilt of the surface of the table, as and for the purpose set forth. V

20. A concentrating-table, means for rectilinearly reciprocating said table, including an actuating-pitman,bearing-supports for the diagonally opposite corners of said table, said supports arranged on opposite sides of said pitman, `connections between said bearingsupports for simultaneously adjusting the same, and means for independently adjusting said bearing-supports, as and for the purpose set forth.

21. A concentrating-table having parallel sides or edges, means for reciprocating said table on a line diagonal with respect to said parallel sides or edges, and means for adjusting said table laterally with respect to its line of reciprocation to vary the inclination of said edges with reference to the line of reciprocatory movement, in combination with stirrups, means for adjustably supporting the same adjacent to the upper edge of said table, and a wash-water-supply box loosely suspended in said stirrups, as and for the purpose set forth.

22. A concentrating-table having its upper and lower sides or edges substantially parallel with each other, and means for reciprocating said table in a diagonal direction, whereby the lower or tailings-discharge edge of said table is inclined with respect to the line of reciprocation, supports for the extreme upper and lower diagonally opposite corners of said table, said supports arranged respectively on opposite sides of the reciprocating means and comprising cam-sleeves, and means for moving said cam-sleeves for adjustably varying the angle of inclination of the surface of said table, as and for the purpose set forth.

23. A concentrating-table having its upper and lower sides substantially parallel with each other, a rod connected to said table in a line diagonal with respect to said parallel sides, and means for longitudinally reciprocating said rod, in combination with supports for the eX- treme upper and lower diagonally opposite corners of said table and arranged respectively on opposite sides of said rod, each support comprising a pair of cam-sleeves, and means for moving one member of each pair of camsleeves with respect to the other member, whereby the tilt or inclination of the surface of the table may be adj ustably varied, as and for the purpose set forth.

24. A concentrating-table having its upper and lower sides substantially parallel with each other, a rod connected to said table in a line diagonal with respect to said parallel sides, and means for reciprocating said rod longitudinall y, in combination with supports for the extreme diagonally opposite corners of said table, and arranged respectively on opposite sides of said rod, each of said supports comprising a pair of coperating cam-sleeves, the members of each pair of said sleeves being relatively adjustable, as and for the purpose set forth.

25. Aconcentrating-table and means for reciprocating the same. in combination with bearing-supports for said table, said bearingsupports each comprising an upper and lower cam-sleeve, means for independently adjusting said cam-sleeves, and connections between said cam-sleeves whereby said table may be adjusted independently at each bearing-support or coincidently, as and for the purpose set forth.

26. A concentrating-table, means for reciprocating the same, the tailings-discharge edge of said table throughout its length being inclined away from the line of reciprocation from the head end of the table toward the opposite end thereof, and riflles or projections upon and in diagonal relation with respect to the table-surface, said riiiles or projections being arranged in substantially parallel relation to the line of reciprocation of the table, as and for the purpose set forth.

27. A concentrating table having riffles upon the upper surface thereof, the lower or tailings-discharge edge of said table being unobstructed and inclined with respect to said riiiies, and means for imparting a reciprocatory movement to said table in the direction of the length of said riflcles, as and for the purpose set forth.

28. A concentrating-table of substantially diamond shape, in combination with means for imparting reciprocatory movements to said table in a direction diagonal with respect to said table.

29. A concentrating-table of diamond shape in outline, in combination with means for imparting reciprocatory movements to said ta- IOO IIO

IO Hes arranged on said concentrating area and parallel With each other and With the line of reciprocating movement of the table.

In Witness vvhereol I have hereunto set my hand, this 241th day of November, 1900, in the presence of the subscribing witnesses.

GUSTAVE A. OVERSTROM.

Witnesses:

GEO. A. LONG, C. M. SAWYER.

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