US1417682A - Ore-concentrating table - Google Patents

Description

G. A. OVERSTROM.

' ORE CONCENTRATING TABLE.

Z 2.. .9... ,1T E 0M 3% ym ai. Mm s d2 m m D1 APPLICATION FILED JULY 17.1918. LALGS G. A. OVERSTROM. ORE CONCENTRATING TABLE.

APPLICATION f lLED JULY 17.1918.

Patented May 30, 1922.

2 SHEETS-SHEET 2.

Fig.' l, looking in the GUSTVE A. OVERSTROM, O1? PASADENA, CALIFORNIA.

onE-coNcErrTaArrnG TABLE Musea type which is simple in construction and elficient in operation.

A further object of the invention is to provide an ore concentrating table of ymore or less universal application capable of handling without alteration, except possibly in the' riiiiing, various sizes of material even down to the condition of. slimes.

A further object of the invention is to provide a concentrating table-of the type referred to which is practicallymoiseless in operation. J

A further object is to provide a concentrating table of the vibratory type wherein the vibrations are imparted in an arcuate or circular direction generally lengthwise of the table. y

A further object is to provide an ore concntratorof the percussion type inlwhich t e where the percussion bump is taken.

Other'objects of the invention will appear more yfully'hereinafter- The invention consists substantially in the construction, combination, location andl rel- 'ative" 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.

eferring to the accompanying drawings and to' the various views and reference signs appearing thereon Fig. 1 is a View in top plan of a concentrating table embodying the principles of my invention.

Fig. 2 is a View in longitudinal section on the line 2, 2, Fig. 1, looking in the direction of the arrows. Y

Fig. 3 is a viewfin end elevation.

Fig. 4 is a view in section on the line t, 4, direction of the arrows.

Fig. 5 is a view in longitudinal section on the'line 5, 5, Fig f1, looking in the direction of the arrows.

Specification of Letters Patent. application fue@ July 17,

throughout 1918. elial No. 245,309.

Fig. 6 is a view in top plan of the lower frame of the-supporting framework.

' Fig. 7 is a detail view in diagrammatic top plan illustrating the circular arc motion impartedto the table surface.

Fig. 8 is a broken view gram illustrating the concentrating action.

Figs. 9 and 10 are detached detail'view's respectively in side end elevations of the spring supports.

Fig. 11 is a diagram illustrating the arcuate motion imparted to the table.

Patented May 30, 1922. l

in top plan dia F 12 is a broken view in elevation illustrating the manner of attaching the spring su ports.,

i ig. '18 is a detached detail view of the unbalanced wheel :for imparting the vibratoII'y motion to the table.

ig. 14 is a view'in section on the line 14, 14:, Fig. 13, looking in the direction of the arrows.

Fig. 15 is a broken detail view in transversefsection through the table surface and t'he riflies thereof.

rllhe same part is designated by the same reference numeral wherever the same occurs the several views.

1n its general structure the ore concentrating table embodying the principles of my inventionconsists enerally of a transversely inclined rifiled tab e surface which is hinged along the tailings ydischarge edge thereof to ashaking frame structure and supported along its feed and wash water supply edge for adjustment to vary the transverse inclination thereof. vThe shaking frame is supported upon a floor framework by means of fiexible supporting legs rigidly secured to the Hoor frame and to the shaking framefbut so constructed and disposed as to impart to the table surface an arcuate motion in the general direction of length of the table and in a manner after more fully set forth, the motion being given to ,the table through the action of an unbalanced pulley. The rilles on the table surface are arranged to extend substantially in the direction of the circular arc motion imparted to the table. f

Referring more particularly to Fig. 6 the floor frame is of generally rectangular outline and includes parallel vside stringers 16, 17, spaced apart from each other by trans versely disposed girts 18. The blocks 19 are mounted u on the outside surfaces of the stringers 16, 1 and are bolted and doweled and for a purpose herein? .brace 20 abuts at to said stringers.

the head motion end of the floor frame af spring post 23 is hinged to the inside surface of one of the stringers, as Stringer 17, and a rod 24 connects the upper end of the spring post with the corbel 21. Through the rod 24 the post 23 may be adjusted upon its hinge to vary the pressure exerted by the spring 53 against the shaking frame.

The shaking frame in the particular form shown is of light cross braced structure with longitudinally extending outside stringers 25. spaced apart by spreader girts 26 (see Fig. 5.). The spreader girt 26 at the head motion end of the shaking gframe bears against theV ends of reinforcing pieces l27 which are bolted and doweled to the inside surfaces of the stringers 25 in order to secure an efficient backing for said girt. Leg receiving and clamping blocks 28, corresponding and similar to the blocks 19 of the floor frame, are bolted or otherwise suitably secured to the shaking frame stringers 25. The shaking frame, if desired', and as indicated, may be'fstill further braced by diagonal struts29. A shaft 3() is clamped at its ends in the stringers 25 atthe head motion end of the shaking frame and extends transversely of said frame, said shaft moving with said frame in 'the shaking movements thereof. The shaking frame Stringer 25 on the feed side of the table is longer than the Stringer on the tailings discharge side,

the excess length occurring at the concenf trates end of the table. Upon this extension is mounted a bracket 31 (see Fig. 5) which carries the adjusting screw 32. This screw engages the wedge member 33 which is mounted upon the upper surface of the ex- -tended Stringer 25 and is retained in place thereon by means of side cleats 34. The

wedge member 33 is formed with a plurality of inclined or wedge surfaces 35. At the tailings discharge side of the shaking frame standards 36 are bolted to the Stringer 25 on that side, and to these lstandards are hinged the deck beams 37 of the table. A transverse deck beam 37 of the table 38 rests at the feed side of the table upon an inclined or wedge portion 35 of wedge member'33 so that by suitably adjusting the screw 32 the angle of transverse inclination of the table 38 may be varied.

The shaking frame is supported upon and carried by the floor frame through supporting legs indicated generally at 39 which are not only of special structure -to render them fiexible, but are also specially disposed and arranged in order'fto secure the circular arc motion of the table. In the' particular form shown (see Figs. 9, 10 and 12) the flexible supporting legs 39 are made up of flat strips of suitable flexible material. In practice I have found selected hickory to be suitable for this purpose, but, of course, I do not desire to be limited or restricted in respect to the particular material employed. I have indicated in Figs. 10 and 12 a flexible le'g structure consisting of two flat strips 40, 41 placed flatwise against each other, and reinforced at the lower ends thereof on the head motion si'de and up to `approximately the inidlength point thereof by extra strips or'leaves of successively varying lengths as indicated at 42,` and similarly their upper ends on the concentrates side by extra or auxiliary leaves or strips also of successively'varying lengths as indicated at 43. All of the leaves, strips or plates constituting a flexible leg structure are bound together by suitable clamps indicated at 44. These flexible legs 39 are clamped at rtheir lower ends in the clamp blocks 19 on the sides ofthefloor frame stringers 16, 17, and at their upper ends in the clamp blocks 28 applied to the stringers 25 of tlie sliakino` frame, and said flexible legs are so disposed that their edges present in a direction generally transverse to the lengths of the floor and shaking frames, and their flat'surfaces present generally in the direction of Vthe lengths of said frames. However, instead of the edges of the flexible legs presenting squarely in lines ,transverse to thel floor and shaking frames, said legs aie so set' that their reinforced at planes instead of being parallel toeach other f i and at right angles to the lengths of the frames, are inclined towards a vertical plane containing the axis of the head motionshaft 30. This inclination of the legs 39 is clearly indicated in Figs. 6 and 11 by the diagram lines 45, 46. In Fig. 11 the diagram line 47 indicates the vertical plane of the axis of shaft 30, and it will be seen ythat the vertical planes of the flat sides 'or surfaces of the flexible legs 39 are. in planes which are slightly inclined to the plane 47, and so inclined with reference to the plane 47 as to converge at a point 48, which should be in practice approximately fiftyfeet away fr rn the side of the table. I have found in practice that this arrangement and disposition of the flexible legs is important in securing the objects and purposes of xriy invention, and therefore such arrangement constitutes a valuable yfeature of my invention. With such arrangement under the infiuence of the head motion reciprocatory movements are impartedto the table in aV direction generally From this description it will beseen that the movements imparted to the table are substantially parallel with or in the direction of the length of the table at the feed end thereof and hence at substantially rightv angles tothe flowof feed water in the region of the table surface where the feed is supplied, where it settles, and Where 1t initially stratifies. Towards the concentrates discharge end of the table, however, the re ciprocatory movements imparted to the table by the head motion depart from parallel relation to the table length and become more l and more transverse thereto and at'a de# reciprocatory movements, moves in a cir-l cular arc, the arc of movementv having its center lying a substantial distance away from the feed side or edge of' t-he table and substantially in the vertical plane of the head motion end of the table, as above describe This peculiar motion imparted to the table I call an arcuate or circular are` t from workingloose. Reciprocations are 1mmotion. .f

By the'construction, mounting, clamping, and disposition of the flexible legs as above explained the bending strains imposed thereon during the shaking movements of the table are uniformly distributed, and consequently the flexible legs with reasonable care are practically indestructible. In lpractice, and in order to insure durability of the flex- .ible legs, I prefer after the leaves or strips Y' are assembled, to soak the legs for a considerable period of time, say, for a week or ten days, in crude oil or pine tar. -V

In addition to the slightlyangular disposition of the planes of the flat sides or faces? of the flexible legs, as above explained, Ialso prefer to slightly incline the legs vertically and towards the head motion end of the table as clearly indicated in Figs. 2, 5 and 12. By reason of such vertical inclination away from the concentrates discharge end of the table a slight vertical movement is imparted to the table during its shaking movementswhich I have found in practice to be beneficial lin efliciently settling the mineral particles'out of the mass of ores under treatment, and in ,advancingy such particles towards the concentrates discharge end of the table.

Anotherand la most important and'valuable resultattained by the vertical inclination of the flexible legs will be comprehended when it is remembered that the head motion is not connected lrigidly to a station- Consversely, if the table is heavilyloaded the legs will bend more towards the head motion end than ifthe table were lightly loaded. The result is that when the table is overloaded the stroke becomes longer because of the greater degree of bending of the legs towards the head motion end, and consequently the load is lworked off faster. Similarly, when the table has no load, or a lighter load, the vertical inclination' of the legs is less andA consequently the'strokeiof arcuate movement of the table is shorter. Consequently with the arrangement above described thestroke of the table, that is, the extent of its arcuate movement, is automaticallyv controlled by the load of ores to be treated the table is called upon to handle.

In practice, and in order to secure the best results, I prefer to key the legs fast at their endsy to their respective stringer blocks 19, 28, and precaution should be takenl byv means of clamps or otherwise as indicated at 49 (see Figs. 2 and 12) to prevent the keys parted to the table by means of an unbalanced pulley 50 (see Figs. 1, 13 and 14),

mountedy to revolve upon shaft 30, the latter,

as above explained, .being mounted in the shaking frame and moving with it. A balanced pulley 51 is also mounted to revolve upon L.the shaft 30. When the power transmission belt is applied to the balancedpulley 51 no motion is imparted to the shaking frame and table. When, however, theI transmission belt is shifted tothe unbalanced pulley the shaking frame and table carried thereby receive their vibratory, arcuate or circular arc movement. In practice I prefer to employ an excess of counterweight in the unbalanced pulley over the amount required to handle the usual or average load of. ores on the table, so that should an overload'occur at any time surplus of power is available to handle the same properly. In practice the unbalanced effect and counterweight of the pulley 50 is'attained by bolting on to said pulley auxiliary blocks or pieces as inizo shown, I prefer to place this counterbalauc? i ing spring 53 at the head motion end of the form shown such adjustmentis secured by l means of ,the adjusting rod 24' which is connected to the upper end yof the pivoted arm j 23 and to the corbel 21.

The counteracting spring wherever mounted should preferably be disposed in such manf ner as. to exert its tension at its point of application in a direction with the line of motion of the shaking frame at such point of connection. The function of the spring tension in addition to counteracting the action of the unbalanced pulley is to secure steadiness of the motion imparted to the shaking frame and the table carried thereby and also to prevent undue bending of the flexible supporting legs 39 due to their inclination in a vertical plane ,towards the head motion end of the table.

The differential or bumping action is secured by means of a pad 54 carried by the girt 26 at the head motion end of the shale ing table striking the end of the bumping brace 20. By thus substantially arresting the motion of the shaking frame and table in their movement towards the concentrates discharge yend ofthe table the particles of concentrates or values advance very rapidly over the table surface and towards the concentrates discharge end, and the operation isrendered practically noiseless by suitably constructing the pad 54. I have found that a piece of felt clamped between the pieces of belting Well answers the purpose.'

It is obvious, of course, that theconstruction above described permits a variable number of pieces of felt and belting to be employed for the bumper pad 54.

The deck or table frame consists, as above explained. of cross beams 37 which in practice I prefer to place in comparatively close proximity as to each other and suitably jointed to the side pieces= 55. Upon these cross beams the deck boarding forming the table surface 38 are carried, the deck board ing preferably extending inpractice in the direction of the line of motion imparted to the table, thereby securing the maximum degree of bracing effect. The deck of the table is preferably and as usual covered with linoleum. As above explained, the cross beams 37, or certain of them, are. hin ed at the tailings discharge edge of the tab e to the hinge brackets 36 carried by the shaking frame, while at their other ends the deck beams 37 are supported upon the adjusting wedge or inclined surfaces 35 of the adjusting bar through which the angle of transverse inclination of the table may be adjusted. By providing an adjusting wedge or inclined surface 35 for'each table deck cross beam 37 warping of the table deck is prevented. A bracket 56 attached to the head' motion end of the table at the feed side thereof slidingly receives a bracket or arm 57 carried by the shaking frame. By this construction the feed side of the table is elicien'tly held to the shaking frame so asto partake of the reciprocatory movements ,thereof While at the same time permitted to be elevated or depressed through the action of the adjustin wedgebar to vary the transverse inclinat1on of the table. The table surface is provided with ritlies 58 as in standard practice. rililes 58 are of hard wood, and, according to common practice in the art they may be of equal height at the head'motion end of the table and for an appreciable distance from said end, after which they ytaper towards their opposite ends and terminate in Preferably the a diagonal line', `leaving'an unriflled portion j of the table surface of generally triangular shape at the concentrates discharge end of the table. Y j

I have found in ractice that the arrangement of riiiles sliould vary somewhat according to the size of the material handled thereon. In the case of very coarse large sized materials the rillles should extend practically in line with the direction Vof motion imparted to the table. With medium sized material the riflling should be somewhat out of line with the direction of movement of thetable surface, and with finer material and for slimes the riiiiing should l be still less in the direction of the motion and since the direction of motion imparted -to the table is in the-curve of an anc it will of course be understood that when I com,

the material being handled, the curvaturebeing greatest for the coarser sizes of ore.

By thus curving the riiles in the direction of their length and in the general direction of the circular arc motion imparted to the table and more or less in parallel relation to such direction of circular arc motion it will be seen that at their concentrates discharge ends the rilles are disposed up hill, so to speak, by reason of the transverse inclination of the table. it will also be seen from the construction above described that the longitudinal .inclination of the table as here-V tofore ordinarily requiredis dispensed with, the table though transversely inclined remaining level, that is, the tailings discharge edge of the table as well as the feed and wash water edge remaining" in horizontal planes although moving in the circular arc path as above described. The'riifles', however, being curved more or less`towards the concentrates discharge end and towardsthe higher or feed and wash 'water side of the table have their concentrates discharge ends disposed somewhat transversely of the table surface and hence may be said to extend up hill as the table is transversely inclined. The result is that withrthis arrangement of riiies Acombined with the arc movements imparted to the table the concentrates are forced away from the upper sides of the rif- Hes and towards the lower sides of adjacent riffles as indicated at 60 in Figs. 8 and 15 whilethe gangue or tailings indicated at 61 wash over the upper edges of the riflles. Since the tailings discharge side or edge of the table is horizontally level and the ritlles run uphill somewhat transversely across the .table surface and toward the feed side and concentrates discharge end, the flow of the wash water is more or less in a direction op` posite to the direction of travel of the ganguev or material' under treatment. This action permits of an unimpeded progress of the concentrates towards the concentrates end of the table, and at the same time increases the rapidity of travel of the concentrates towards the concentrates end of the machine, whereas in prior concentrating tables the progress of the concentrates is moreor less impeded and the travel thereof is less rapid.

Moreover, the combined action ofthe rilex,

arrangementv and circular arcfmotion imparted to the table quickly produces a veryl thin bed of material on the table surface, thereby permitting a more perfect separation.

As usual in ore concentrating tables the material to be treated is fed onto thetable surface from ther` feed box 52 which is disposed along the upper edge ofthe table from the head motion end thereof.4 The wash water is supplied from thelbox 63 which like- Wise is disposed alo'ng the upper yedge of the table and extends from the termination of the feed boX to the concentrates discharge end of the table. The concentrates are disposed over theconcentrates end of the table into the concentrates receiving 100x611.

Referring to the diagram. Fig. 7, and from the foregoing description, it will be understood. that in the area A, B, C, D, the tailings have practically no progression toward the concentrates discharge end of the table. The circular arc motion imparted to the table tends to move the tailings in this area toward the concentrates discharge end of the i the direction of the arc movements imparted to the table, the table surface moves rather more uphill and in a direction away from the rifiles. The` result is the concentrates are thrown more towards the lower sides of the riftles as above explained, where the water accumulation is less, and consequently are carried o-ut upon the relatively smoother unriflled triangular portion D, C, G, of the table surface without being washed over the riflles along with the tailings. Thebulk of the concentrates' are delivered over the concentrates discharge end of the table, or ,that

portion thereof extending from G to H,-and.

`but very little of the concentrates are discharged over the portion of the concentrates discharge `end of the table from H to C. The bulk ofthe tailings are' discharged from the tailings discharge edge of the table from F to B and; very little of the tailings are discharged at 'that portion of the tailings discharge edge from B to C. Infact, in the area J, B, C, K, there is very little of either y concentrates or tailings since the'separation of the bulk of the concentrates takes placenearer to the upper edge of the table, only a lvery small part ofthe tailings being progressed beyond'the riflled area from D to K,

and this portionof tailings moves of course under the influence of wash water', in the direction K, B.

In prior structures of' concentrating tables reaudjustment of the inclination of the table is necessitated incase of any sudden overfeed Ior underfeedof vmaterial tol the table surface.` This is particularly true in the case of sudden overfeed of material, whichevent is in practice of rather frequent happening. In such case in the tables heretofore employed theV transverse inclination of the` table is decreased in order to prevent the concentrates from delivering into the middlings or being`carried into the tailings. In case ofA an overfeed of material with the table above described read-justment of the inclination is not required. The concentrates are eiiiciently separated and simply are delivered higher up on the table surface without any disturbance of the transverse inclination ofthe table. Should a condition of overfeed be prolonged, then with thel table 'above described a greater degree of inclinay and thereupon an even better separation of concentrates will take place and at a portion From the foregoing description it will be seen that I provide an extremely simple structure'of table and an extremely simple means for imparting a clrcular arc mot1on` thereto through a differential motion applied to the same, which circular arc motion while substantially parallel to the discharge side of the table. at the head motion end becomes more and more angular in an uphill direction from the discharge side of the table progressively towards the concentratesv end of the table, the rifHes being similarly disposed, that is, extending in the `general direction of the motion, but curved `into more or less inclined relation with respect to the motion towards the concentrates discharge ends of the riiles. It will be also seen that by arranging the fiat flexible supporting legs with the planes of their flat faces so inclined relatively to each other as to intersect in the plane of the axis of the unbalanced pulley I am enabled to secure the peculiar circular'arc motion which forms an important feature of utility and effectiveness in the operation of 'the table.

It will also be seen that I provide a table of the bumping or percussionptype where the material travelsaway frompthe point where the bump is taken, wherein a spring counteracts the surplus or excess of pqwer of the revolving unbalanced pulley, and wherein the spring acts to accelerate the bump, that is, the forward stroke of the table, but opposes theJ back stroke.

It'will also be seen that I provide a table of the character referred to which automatically varies its stroketo accommodate variations in load .of material supplied thereto'.-

While I have shown and described a specific structure of table embodying the principles of my invention, I wish it tobe understood that variations therefrom in the details thereof might readil occur to persons skilled in the art and sti l fall within the spirit and scope of my invention. I

do not desire therefore to be limited or re stricted to the exact details shown and described.

Having now set forth the 'object and nature of my invention, and a structure embodying the principles thereof. what I claim as new and useful and of my own invendescribed by said table being at one side thereof, but in the vertical plane of the head movements longitudinally thereof at the head end, and means for deflecting lsaid movements transversely towards the tail end thereof on an` arc of a circle.

3'. In anore concentrator, the combination 0f `a table and means for imparting vibratory movements to the same, said movements being initiated in the direction of the length of ythe table and progressively deflected transversely thereof towards the discharge end of the table, and means for causing a sudden stop of said movements.

i 4.- In an ore concentrator, a transversely inclined table, means for imparting vibratory circular arc movements thereto in the direction of the length of the table, the center of the are described by said table being at one side thereof but in the vertical plane of the head motion end of said table, and which plane is at right angles-thereto.

5. The combination, in an ore concentraiongaudinaily of Said table at the head end Y thereof, and progressively deflected transversely towards the discharge end of said table, thereby `discharging ore waste tangentially of said riflles.

7. The combination in an ore concentrator, of a table and means for imparting vibratory are motion to said table at one thereof only, but in the general direction of the length of said table, riifles on said table, said riiiles being curved` and extending longitudinally along the table whereby, when said table is in motion, ore waste is discharged tangentially of said riiles.

8. The combination in an ore concentrator, of a table, and means for imparting vibratory arc motion to said table in the general direction of the length of said table, said motionpartaking the path of the arc of a circle at one end of said table,l while retaining a longitudinally reciprocable movement at the other end thereof, ritlles on said table` said riflles being curved and extending longitudinally along the table, whereby` when said tableis in motion. ore waste is discharged at angles to said riflles, said angles increasing near the discharge end of the table.

for initiating rectilinear movements to'said ores, means for separating saiduores, and means for deflecting one end of said concentrator on an are of al circle..

11. In an ore concentrator, a vibratoryI -table and supporting legs therefor, saidlegs being transversely flexible, the axes of flexibility 0f said legs being disposed atv progressiigly increasing angles to the length of the ta e.

l12. In an ore concentrator, a vibratory table and supporting legs therefor, said legs being transversely flexible, the axes of flexibility of said legs intersecting in a commonl point removed laterally from the table.

13. In an ore concentrator, a vibratory table and supporting legs therefor, said legs being transversely flexible, the axes of flexi-l bility of said legs intersecting in a common point located at right angles to one end of the table and removed laterally therefrom.

14. In an ore concentrator, a vibratory table, and flat transversely flexible supporting legs therefor, the planes ofsaid legs disosed at progressively increasing angles to the len th of the table.

15. n an ore concentrator, a shaking frame, a table carried thereby, a shaft mounted transversely in said frame, an unbalanced pulley mounted to rotate on said shaft, and transversely flexible legs to sup port said frame, the axes of flexibility of said legs intersecting the axis of said shaft in a common point.

16. In an ore concentrator, a shaking frame having longitudinal side stringers, a girt connecting said stringers at the head end of said stringers, a shaft having its ends carried by said stringers, an unbalanced pulley mounted to rotate on said shaft, a spring acting against one side yof said girt, a statonary bumping brace arranged opposite the other side of said girt, and a table carriedbv said frame.

17. In an ore concentrator, a shaking frame, a table on said frame, an Aunbalanced lrotary pulley carried by the frame to vibrate the same, a bumping brace to arrest thevibratory movement of the table in one direction, a counteracting spring to .oppose the vibratory movement of the table in the other direction, and flexible supports for the frame and table. n

18. In an ore concentrator, a shaking frame, an unbalanced rotary pulley carried by the frame to vibrate the same, a bumping brace to arrest the vibratory movement of the table in one direction, a spring'to oppose the vibratory movement of the table in the other direction, means to adjust the tension of said spring, and a table carried by said frame.' A

19. vIn an ore concentrator, a shaking frame carried by flexible supports, an unbalanced rotary pulley carried byv said frame,

a stationary bumping.bracetdarrest the frame in one direction of its movement, a spring arranged to exert its .tension to oppose the same in the other direction of its movement, a cushion pad to receive the inipact of said brace anda table carried by said frame. l

20. In an ore concentrator, a vibratory table, and means to' automatically vary the period and .the course of vibrationthereof proportionallyto the load imposed thereon. 21. In an ore concentrator, a table, flexible 'supporting legs therefor, and means connected to said table to vibrate said table on said legs., said legs being vertically inclined to an increasingly greater degree lfrom head to 'transversely of saidframe, transversely flexible supporting legs for said frame, said legs having their bending axes disposed angularly to the axis of said pulley, and a table carried by said frame.

23. In an ore concentrator, a shaking frame, an unbalanced-.rotary pulley carried thereby, the axis of said pulley extending transversely of said frame, transversely flex` ible supporting legs' for said frame, said legs having-their bending axes disposed angularlyct the axis of said pulley, a table carried by said frame, and means to vary the transverse inclination of said table. f

24. In an. ore concentrator, a shaking frame, an unbalanced rotary pulley carried thereby, the axis of said pulley extending transversely of said frame, transversely flexible legs having their bending axesdisposed `angularly to the axis of said pulley, a 'sta- Vin angle to the vertical axial plane of the table from the head end to the discharge end thereof, and a .plurality of pairs of longitudinally yielding supports mounted in said clamps and supporting the deck.

27. A concentrating table having a deck and a plurality of pairs of vertically extending supports for lthe deck, said supports being flexible to permit the same `to yield in vertical planes, and each pair of supports being arranged at an increase in angle to the vertical axial plane of the table from the head end to the discharge end thereof, and means for reciprocating the deck.

28. A concentrating table including abasc frame, a deck, a plurality I-of-.pairs of support clamps carried upon the base frame,'a plurality of pairs of corresponding support clamps carried upon the deck, and a plurality of pairs of longitudinally yielding supports mounted in said clamps and supporting I the deck, the pairs of yielding supports being arranged at an increase 1n angle to the vertical axial plane of the table from the head end to the discharge end thereof, and means for reciprocating the deck.

29. A concentrating table having a deck, a plurality of pairs of supports for the deck arranged at spaced intervals from the head to the discharge end thereof, each of said supports yielding in a direction approxlmately parallel to the lengths of the deck, each palr of supports being arranged at a different angular relation tothe axis of the deck from any other pair of supports.

30. concentrating table including a reciprocating deck, a plurality of pairs of supports for the deck arrangedat spaced intervals from the head to the ldischarge endof the deck, each of said supports yielding in a direction ,apprximately' parallel to the length of the deck, the supports at the head end yielding in the direction of the deck, and the successlve supports toward the tail end of the ldeck being so arranged that each pair of supports yields in a direction at a greater an -le to the length of the deck than the prece mg paf'r of supports, whereby to secure a gradual y increasing lateral movement of the deck` as the deck is reciprocated.

31. A concentrating table including a reciprocatmg deck, a base frame, and a-plurality of pairs of resilient deck supports rigidly connected at their lower ends to the base frame and at their upper -ends to the deck, said supports yielding in a longitudinal direction, each pair of supports being disposedin divergent relation to the vertical, longitudinal, axial plane ofthe table and at a greater angle to the axis of the) table than the pair immediately preceding.

32. A concentrating table including a deck, and a plurality of longitudinally yielding Supports fixed at their lower ends and to engage with the deck at their upper ends,

` certain of said Isupports being disposed to yield in a direction parallel to the axis of the deck, the supports at the tail end of the table being disposed to yield at an angle to thelongitudinal axis thereof, whereby to give a lateral component to the movement of the table at its discharge end.

33.'The .combination with an element mounted for longitudinal movement, of a shaft, an unbalanced power driven wheel mounted thereon, means for supporting the shaft `for movement parallel to the movement of the element, rods operatively connecting the shaft to the element and transmitting motion thereto, a bumper block carried upon said rods, a fixed bumper with which the bumper block -engageswhen the bumper moves forward, and a spring` cushioning the rearward movement of the element.

34. The combination with an element mounted for longitudinal movement, of a shaft, -an unbalanced power driven wheel mounted thereon, means for supporting the shaft for movement parallel to the movement of the element, rods operatively connecting the shaft to the element and transmitting motion thereto, a bumper block c arried upon 'said rods, a fixed bumper with which the bumper'block engages when the bumper moves forward, a spring cushioning the rearward movement of the element, and means for adjusting the tension of said spring. v

35. A head motion of the character described including a shaft, a power driven unbalancedy wheel mounted upon vthe shaft, a bumper block operatively connected to the unbalanced wheel to reciprocate therewith and operatively connected to the element to be reciprocated, a fixed bumper disposed in the path of movement of said block, and means for supporting layers of cushioning material upon the face of thebumper block,

said means permitting a variable number of layers to be used.

In testimony whereof I have hereunto set my hand on this 8th day of July, A. D. 1918.

` GUSTAVE A. OVERSTROM.

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