US2198816A - Ore separator - Google Patents

Description

April 30, 1940.

' H.' c. HEATH 2.l98,816

ORE SEPARATOR Filed June 20, 1958 '7 Sheets-Sheet l INVENTOR. Harry 6'. flea/h BY WM ATTORNEYS.

H. C. HEATH ORE SEPARATOR April 30, 1940.

Filed June 20, 1938 7 Sheets-Sheet 2 m m mm w m Ifi A April 30, 1940. HEATH 2,198,816

ORE SEPARATOR Filed June 20, 1938 7 Sheets-Sheet 3 Ammwzvsi H. C. HEATH ORE SEPARATOR A ril 30, 1940.

7 Sheets-Sheet 4 IN V EN TOR. v

s m m n \A n 1 w H C w 8 H Filed June 20, 1938 H. C. HEATH ORE SEPARATOR April 30, 1940.

- '7 Sheets-Sheet .5

INVENTOR. Harry C. flea/h Filed June 20, 1938 ,4 .W/ YATTORNEYS.

H. C. HEATH ORE S EPARATOR April 30, 1940.

Filed June 20, 1938 7 Sheets-Sheet 7 Jmm m M m H N. m U15 F a Patented Apr..30, 194O UNITED STATES PATENT OFFICE l i 1 2,198,816 Y l i one SEPARATOR Harry 0. Heath, San Francisco, Calif. Application June 20,1938, Serial No. 214,676

16 Claims. (01. 209-455) This invention relates generally to ore separators in which the values are separated from the. ore and has for its objects improved apparatus for efficiently and economically effecting such separation and which apparatus includes improved jigs in which the water and material therein including the ore is subjected to pulsations caused by alternate applications of fluid pressure transmitted to the jigs and the characteristics of which pressure may be varied in a single jig or differently in several or many .l'igs as may be desired, and in which the several j of fluid pressure.

or many jigs are operated from a single source Other objects are the provision of improved means for removing practically values only from. this ore at one point in the separating process and thereafter completing the separation of values from the remainder.

Still further objects and advantages will appear in the specifications and drawings annexed hereto.

In the drawings, Fig. 1 is an elevational diagrammatic view of a dredge to illustrate the general relationship of the jigsto the other ele- .ments of the dredge as well as their relationship to each other. l l Fig. 1A is a semi-diagrammatic end view of the screen and jigs of Fig. 1.

Fig. 2 is a simplified elevational semi-diagrammatic View showing the oil circuit for actuating the jig only one jig being shown, and the remaining elementsbeing illustrated in a simple taken along the line 5-5 thereof.

manner for clearly showing said circuit and the 1 various elements.

Fig. 3 is a semi-diagrammatic plan view of the oil distributing system, indicating the positions of the main jig hutches therein.

Fig. 4 is a part sectional, part elevational view of the oil distributing valve. Fig. 5 is a sectional view of the valve sure relief valve in the oil system.

Fig. 9 is an elevational view of the pair of cleaner jigsindicated at the top of the dredge in Fig. 1. l l i Fig. 1015 an elevational view ofthe jigs of of Fig. 4

,inclined revolving screen I having therebelow the usual stationary pan or housing with a channel-like bottom 2 extending longitudinally of the screen for catching the smaller particles of ore passing through the screen. The ore is fed into the upper end of the screen from a hopper conventional loading means, such as a shovel, bucket, etc., not shown. The coarser material passes out of the lower open end of the screen onto a conveyor 4 by which it is conducted to any desired point for dumping therefrom.

A water pump 5 driven from motor 6 draws water through conduit 1 and forces the same into conduit 8, a portion of which conduit 8 extends into and longitudinally of screen I, said portion being disposed within said screen in a position space-d on appreciable distance above the lower inner side of said screen. The under side of said portion is apertured to discharge the water .thereindownwardly onto the material passing through the screen, and the water thus discharged passes through the screenand onto the channel along opposite sides of the channel 2, so. as to provide a battery of jigs along said oppositesides of said channel. The jigs are filled with water conducted theretoby pipe ,IZwhich is connected with the discharge side of pumps, which pipe is broken in length in Fig. 1 for more clearly showing the jigs along one side of the channel 2, it being understood that a water pipe l2 extends along both rows of jigs. Branch lines (not shown in Fig. 1) extend from said pipe 12 to each jig, each of which lines is suitably valved for regulating the flow of water to each jig.

The finer material from the channel 2, therefrom passes into the water filledjigs, which mate-' rial, and shot beds, are subjected to intermittent pulsations caused by contracting and expanding 3,which hopper may receive the ore from any the lower portions of the jigs by means of flexible diaphragms I3 forming parts of the sides of said portions respectively, the diaphragms themselves being reciprocated by intermittent pulsations in 011 lines l4 operatively connected with the diaphragms, as will later be described. These pulsations that are so transmitted to the water in the jigs causes the lighter oreabove the shot beds to rise, but the heavy values will pass down- 1 wardly through water, shot bed, and screen supporting the latter, to within the lower portions of the jigs from which they are withdrawn through suitably valved openings, or conduits,

The lighter, surplus material, or tailing, and overflow water, passes over the jigs into? a discharge chute l5 and back into the pond l6 that provides the water for pump 5.

The material drawn from theilower ends of the jigs is carried by any suitable means to a bucket conveyor H or any other suitable-"conveyor means, to a de-watering cone I8 wherein the ore, is permitted to settle for drawing off through an same manner as jigs ll, except that it is smaller.

From the finishing cell 29 the surplus ore passes into a secondlarger jig 2|, which I term a 'scavenging cell. The material drawn from the lower discharge opening in the finishing cell 29 is substantially pure'gold free from impurities, but the material drawn from the scavenging cell, while relatively rich in values, does containan appreciable amount of impurities. This mate rial is passed through a conduit 22 (indicated in dotted line) back to the elevator H, or through conduit 22 that has any suitable pump 23, back into the finishing cell, thus maintaining a relatively rich concentrate at all times in the finishing cell, for a purpose later described.

The tailing from the scavenging cell may be conducted by any suitable conduit 24 back to one of the jigs H'for repassage and there passed to completely remove the values therefrom, or they may be received for further treatment as may be desired. 1 s

The foregoing describes the system relatively complete as incorporated in a dredge and it is this combination and method that constitutes a portion of the invention as well as the structure in the individual elements.

In Fig. 2 is a simplified semi-diagrammatic view showing the oil circuit for actuating the diaphragm in the lowerportions of the jigs. Also certain details of the jig are shown. The oil system is as follows:

A tank 25 contains a supply of oil, which oil is drawn therefrom by means of a gear pump 26, or other pump capable of delivering the oil under pressure. The pump 26 is connected with motor 21 for actuation thereby, and said pump is in a pipe line 28 that delivers the oil to a rotary valve 29." A pressure relief valve 30 is connected in line 28 at a point between the valve 29 and the pump 26.

The rotary valve has a plurality of outlets therefrom, each of which is or may be connected by a pipe line I4 with the diaphragm actuating devices 32, that are carried on each of the jigs l l A valve 33 is disposed in each of the pipe lines M for regulating the flow of oil to said devices 32, and ordinarily each jig carries two diaphragms on opposite sides of the jig, each of which diaphragms has its separate device 32, the pipe I4 being divided at one end to provide a branch line leading to each of devices, as seen in Fig. 2. v

The rotary valve, as will later be described more in detail, is adapted'to intermittently open the several lines I4 respectively connecting with the separate jigs, and the devices M are each provided therein with a movable part connected with the flexible diaphragms, which part is responsive to the intermittent pressure in line l4 for causing reciprocation of the diaphragm, as will later be described more in detail.

Fig. 3 is a diagrammatic view showing the various lines extending to the jigs from valve 29, and this arrangement is generally indicated faces toward end 35 is formed withribs 31 that" extend radially outwardly of the central axis of the drum which ribs are radially inwardly cut away longitudinally. thereof from points 38 equally spaced inwardly of their. outer ends thus providing a seat for positioning an annular ring 39 within the housing spaced from end 34 to provide a space 40 between said ring and said end. (Fig. 5). The ring '39 extends across the housing from the ribs to engage at its opposite side with end 35, which end is similarly engaged to support the ring concentric with the central axis of the drum and to seal the engaging surfaces of the ring and end 35 against leakage of oil therepast. The ring 39 is provided with ports therearoundin axial aligmnent with the'ports in the "sides 36 of the valve housing and the pipes l4 are provided with extensions ,4l that pass through the ports in said sides 36 to within the ports in the ring, the outer sides of the ring being spaced at '42 from the inner surfaces of sides 35. Thus, where pipes l4 lead'from the valve, said (pipes extend across the space 42 and a continuous conduit thus leads from the annular inner face'of ring 39 to the jigs respectively.

Within ring 39 is ahollow rotor 43, which rotor is secured-to the end of a shaft 44, and shaft 44 rotatably extends through a bearing formed in end 34 of the housing. A pulley and belt 45 (Fig. 2) or any other suitable conventional connection between shaft 44 and. motor 21 serves to rotate the shaft and rotor 43. Projecting from the side of rotor 43 (Fig. 5) oppositeshaft 44 and in axial alignment with the shaft, is a tubular extension 46 formed witha passageway opening into the chamber 41 that is formed within the rotor, and the outer open end of said as,

7 2,198,81 wardly extending projection 49 to form a sliding fit between the outer surface of said. projection and the inner side'of the ring. This projection is formed witha through lpassagewaytfl from thechamber 41 to the outside thereof, thelength oflwhich outer open end circumferentially of the rotor, is such as to extendover. at least three of the open ends of the pipe lines M while the re lieved side of the rotor on the opposite side from the passageway will extend over substantially 90 degrees of the circumferenceof the rotor.

hyIn Fig. 4.1 show oneofthe openings in the sidesof the housing closed by a plug 5|, which is ,illustrative of the use of my rotor in the event it isidesired that less than eight jigs beconnected with oil line M. It will be noted that said plug will close off the, communication between the space between the peripheral side of the rotor and the ring;

In operation. of the rotary valve, the oilunder pressure from pipe line 28 entersthe rotor chamber 41 while the rotor is being revolved by the motor connected therewith. As the open end of passageway 5ll comes in registration with the ports in the ring 39tsaid oil passes into the lines is and to the diaphragm actuating devices 32 "that are at the opposite .end of said lines M therebyactuatin-g the diaphragms I3 in one direction. As the rotor continues to revolve, the oil in lines M is permitted to flow into space 3! alongside the ring for passing back into the tank 25through a passageway 52formed on end 34 of the housing. .1 I

Passageway 50 as shown, registers with three ports toulines I4 and discharge recess 50'. opposite thereto registerswith a central port and about half. of each port at opposite sides thereof. When the rotor revolves, the pressure impulse to the leading port comes both fromthe gear pump and from the oil bled back into the rotor from the 1 two ports already passed, since with the exhaustion ofthe inertia supplied by. the initial impulse,

the pressure in lines l4 reverses and the quickest relief is into the latest port registering with passageway 50. This reverse pressure comes from the jigs;

wSince the oil line is completely filled at all times,it.is necessary to provide some relief means i to. relieve any excessive pressure that may be caused by eliminating or restricting the movement of the diaphragm actuating means. This means is the relief valve 38 whichis in line zd between the pump 26 and the rotary valve 29 and which Iwill now describe.

.In .Fig. 8 the relief valve is shown in detail, whichvalve comprises a cylinder 53 secured at f one end to the leg 54 of a T-fitting that is connected in pipe 28 thereby providing a passageway through the leg opening into the one end of the cylinder. A. piston 55 having suitable sealing rings therein, is mounted Within the cylinder and isnormally positioned. at the end thereof adjacent said fitting. A rod 56 secured at one end to said piston extends longitudinally thereof to theopposite end of thecylinder where it is slid ably mounted within a cylindrical recess 5'! in one end of an externally threaded bolt 58,which-bolt is closed at its opposite end and threadedly extends throughthe head 59 of the cylinder. The head. 59 is threaded into the upper end of the cylinder and a cap iii! is threaded onto the outer. end of the head for enclosing the outer end of the bolt and head. .Said bolt is formedwith a square head at its one end for adjusting the boltlongitudinally of the cylinder; and piston rod and the outer endof the piston rod normally spaced an appreciable distance from the closed end of the recess into which it extends to permit movement of the piston and said rod.

Engaging the end of bolt sagwithm the cylinder, is a washer BI, and a relatively stiircoil spring 62 reacts between the piston and washer for forcing the piston to the lower end of the cylinder. The tension of said spring is adjustable by screwing the bolt 58downwardly or upwardly according to the tension deserved.

Surrounding and enclosing the lower end of said cylinder 53 is a tubular housing 63' providing an annular enclosed chamber63 between the walls of the cylinder and housing andthe cylinder walls enclosedby the said housing are ported at M at points therearound and at points spaced longitudinally of the cylinder and above the piston when the latter is atthe lower end of the housing. S l

, Extendingfrom the lowerend of the housing and openingthereinto, is a pipe line 65 which line opens at its oppositeend into tank 25.

It will be seen from the foregoing, that upon excessive oil pressure 11117116011 beyond the pump 26, such pressure will force piston 55 upwardly in the cylinder until the pressure is relieved, and the piston will then force the oil entering the cylinder back into the oil line 23, but if the pressure is sufiicient to" raise the piston above the lowermost openings M, the oilwill be by-passed back into. the tank throughline 65. Thusmy rotary valve may have any desired number of lines M leadingtherefrom, according to the size of the same, or some may be eliminated, without interferingwith its operation, and. some or more of the lines M may be closed or'rejstricted as devergingly extending downwardly to an apex at their lower ends. In each of twoof the opposite converging sides 66 is provided arelatively circular flexible diaphragm !3, of rubber or the like which may. be reinforced by fabric therein in th usual manner. Said diaphragms are secured at their marginal edges to marginal edges of openings in said sides of the jig, the area of each of the openings is preferably about as large the side-'of the jig having said opening, will permit, thusitmight be said that said two conve ging sides" of each of the main jig hutches an. fiexiblegsince the diaphragms comprise the major portions thereof Each diaphragm is centrally clamped j'between plates El Fig. 7 and the diaphragm actuating rod 68 extends axially ou wardlyof the diaphragm and outwardly of the side of the jigcarrying thediaphragm. A channel bar 659 extends transversely across the outer sideof the diaphragm and spaced. therefrom, and if winch bar is secured at its ends". to the side of the Jiig carrying the diaphragm. The bar 69 is centrally apertured to pass .ZQd t8, and after passing throughthe bar, said rod extends centrally into a'cylinder ill through a head H at one end of the cylinder, which head is secured ,to bar 69. BoltslE connecthead ii to said bar and'extend longitudinally of the cylin-.

1 der to its opposite end where they pass through the outwardly projecting margins of the opposite head I3 of said cylinder, and nuts I4 on the outer ends of the rods thus clamp the heads against the ends of the cylinder and clamp the cylinder and heads to bar 69.

The rod 68 terminates at its outer end within the cylinder and on the rod spaced from said end is secured to a piston I5 that is slidably fitted within the cylinder. The rod extends through said piston and then passes directly from the piston into 'a tubular member I6 that clamps a leather cup washer 11 between the same and piston." The outer end of said member I6 remote from'the piston is recessed to receive nut I8 that clamps the member against the piston and which nut also functions to clamp the piston against a shoulder I9 on the rod. The tubular member I6 slidably extends into a dashpot cylinder 89 that is'closed at one end by a head 8! that carriers an axially outwardly projecting rod-like member 82 thereon, which member threadedly extends through head I3 of the main cylinder. A cap 83 threadedly secured on head .13 covers the outer end of -member 82, which member may be locked at any desired position axially of the head I3 by a lock nut 84 on said member outwardly of said head I3, and byadjusting member 82 in orout, the stroke of diaphragm I3 is controlled. A relatively stiff coil spring 85 reacts'between the piston I5 and head II to normally hold the'diaphragm in outwardly expanded position relative to the inside of the jig hutch. The oil line I4 opens into the outer end of cylinder I8 adjacent the head I3 and outwardly of piston I5.

In operation, upon the oil under pressure from pump '26 being admitted toline- I4 through the rotor valve, said oil will pass into cylinder 19 outwardly of the piston I5 and cup washer II,

thus causing the rod 68 and diaphragm I3 to move axially toward the inside of the jig hutch and compressing spring 85. Immediately upon the oil pressure in line I4 being'released by the passage of the rotor port past the opening to pipe line I4, the spring 85 plus the weight of the water and material in the jig hutch will cause the oil to pass back to tank 25 through provided with two diaphragms in generally opposed relation in opposite tapered lower sides of the hutch, but with their central axes con- .vergently directed upwardly to intersect centrally within the jig hutch. Inthe battery of jigs, some of the diaphragms may be actuated to provide longer strokes than others, as de-- sired to thereby enable a very accurate control of the separation of material fed to the jigs along the sides of the revolving screen s, or to meet varying conditions due to different characteristics of the .ore or material being handled.

The main jigs themselves, are described in detail, as follows, the construction being best illustrated in Figs 2, 6, and 6a. v

Two of the converging sides '66 of the jigs have been generally described, and at right angles to these sides are similar sides 66'. The

, opposite end opens into a chute or conduit 88 leading .to. the lower end of anelevator I! (Fig. 1);

The upper ends of the jigs are of generally box-like form comprising a frame of vertical sides 89'two opposed sides of which are provided with upwardly projecting plates 90, which plates provide partitions that are co-extensive ina general horizontal direction with partitions 9[ or guide plates on the chutes 92 leadingfrom the channel 2 below the revolving-screen I to said jigs. See Fig. 1A. The sides 89 form the sides of a shot bed in which there is a screen 93- adapted to support a'bed of shot 94 and spaced vertical partition plates 95 extending between the sides that carry extension99 rest at'their lower edges on the screen, thus preventing the shot from shifting, since the flow of material over the bed is transversely ofthe plates 95, passing over their upper'edges. The partition plates 95, also catch and hold a certain amount of the ore above the shot. The tailing, or lighter waste materials and surplus water passes over the shot bed and into an inclined chute or channel I5 from which it may be carried to any desired point for dumping.

Below the screen 93 is a substantially square, open-ended frame 91 inwhich the four sides are vertical andmembers 98 connect between two' opposed corners of the frame and the upper ends of sides 66', which members position'and support the frame in a horizontal plane centrally within passing water to within the jigs and each water inlet to each jig is positioned at a level just below the frame 91, and one of the plates 98. These frames serve as baflies permitting free lifting of the water body within the jigs under the influence of the diaphragm while evenly distributing the incoming water to prevent greater lifting force at one point within the jig than at another by the water due to the dynamic pressure of the water entering the jig. This is a highly important feature.

Valves 99 on each of pipes l2 serve to'control' the flow of water to the. jigs.

The cleaner jigs, shown on top of the apparatus in Fig. 1 and illustrated more in detail in Figs} 9 to 11 comprise what I termed the finishing cell 28 and scavenging cell 2|. These cells respectively have only one diaphragm on one of the converging lower sides ofthe cells. 4 The diaphragms re spectively vary in size in proportion to the sizes of the cells, the cell so having a smaller diaphragm than cell 2 I, but the construction of the diaphragm actuating devices 32 are identicalwith those described for the jigs II. Each cell 28, 2| has a water inlet I98 that enters the side opposite the diaphragmand the tailings from the scavenging cell passes back to jigs II. All of the value bearing material drawn from the jigs II is fed from the de-watering cone I8 into the cell 20 by way of the nugget box I9 at the side of cell 20 opposite cell 2I and valve IUI at the lower end of, cell 20is for drawing off the values from cell 28.

The screens and shot beds within cells 28, 2| are similar to those in jigs II and the path of ipure .by r'eason of the "fact thattheopeningsin retain the material in the cells;

, aioasic i j the ore from nugget box, to cell .i 20, then ito cell 2 I, then totlie tailing box I03 isindicatedbythe arrows inl 'ig. 12, the side plates 102 The values drawn from cell 20 are practically the screcncarryingthe shot bed are practically filledwith values to theexclusion ofawaste due to the extreme richness of the material fed to cell -20. 1 This material is kept upto itshigh degree of values by returning to said cell the rich con 1 centrate that are permitted to pass over into cell 2|. "Were the concentrates to become sparse in cell 20, obviously the opportunity for lighter par-.

ticles to become arranged next to the screen in saidcell and to pass through the screen, would become greater than where a heavy bed of values is retained therein. It is immaterial in my process how much of the heavier values pass to the scavenging cell so long as there is a good bed of Values against the screen inthe cell 28, and the actionof the cells can be varied, as desired, to

produce this result. U

The general process and means has already been described earlier in the description, but it will be apparent from the description, as a whole,

thatby the very accurate control of the means operative on the valuebearing material, a high efiiciency is possible in the use of the apparatus.

It is, of course, obvious that the conduit 22 and pump 23 may be substituted by a downwardly inclined conduit 22' (indicated in dotted line) leading to the elevator for continuously feeding l the material by gravity into the elevator for re- 3r:

turning the material including values back tocell20. g

'I'ne use of the word ore in the foregoing description and in the claims, refers principally to placer sands and all mineralized sands where it isdesirable to separate the values from value bearing earth.

Having described my invention, I claim:

1. In apparatus of the character described, a

generally box-like jig hutch open at its upper end, said hutch provided with a generally horizontal are supporting screen adjacent saidupper end, and walls disposed below the screen extending convergently frc-mopposite edges thereof enclosing the space therebelow, at least one of said Walls including a flexible diaphragm and means mounting said diaphragm on the hutch for reciprocating movement inwardly and outwardly relative to the center of said enclosed space, means for causing reciprocation of said diaphragm comprising a liquid pressure linehaving a rotary valve therein, said rotary valve being arranged and adapted to cause intermittent pulsa tions of liquid in said line and means connecting between the liquid pressure lineand diaphragm.

arranged and adapted to transmit saidpulsations to said diaphragm.

2. In a construction as defined in claim 1, means for varying the pulsations in said liquid pressure line independently of the rotary valve to thereby modify the degree of movement of the diaphragm caused by said pulsations.

3. Ina construction as defined in claim, 1; the liquid in said liquid pressure line being oil, and the means connecting between said liquid pressure line and diaphragm comprising a stationary cylinder having a piston movable therein connected with said diaphragm, said liquid pressure line opening into said cylinder at one side of the piston. a

49in apparatus of the character described, a

serving to.

jig hutch open at itsupper end and provided with an oreisupporting screen adjacent said upper end, sides onthe hutch enclosing the space below said screenntwo of which are in generally opposedre- .lation and a flexible diaphragm in each of said two sides disposed in planes extending convergently downwardly from said upper end, means for supplying water to said space and over the generally opposedsides of said diaphragms, means for simultaneously reciprocatingsaiddia- .phragms inwardly and outwardly relative to said spacethereby causing generallyupwardly movement of the water through said screen, and means for controlling the degree of reciprocation of said diaphragms.

5. In a construction as defined in claim 4, the means for reciprocating said diaphragms, including an oil pressureline operatively connected with said diaphragms and means for causing the oil in said line to flow alternately in opposite directions in said line.

6. A jig hutch having an open upper side and an ore-supporting screen extending across said open side, and walls extending from said open side enclosing a water chamber. below said screen; a flexible diaphragm forming a portion of oneof the walls of said chamber; means for reciprocating said diaphragm in a direction inwardly and outwardly of said chamber for cause ing water in said chamber to rise and fall through said screen, said means comprising a cylinder and piston therein arranged for reciprocable movement relatively and operatively connected with said diaphragm for causing reciprocation of the diaphragm upon said movement, adjusting means connecting between said cylinder and diaphragm movable for varying the degree of said movement as desired, said adjusting means being normally 8. In apparatus of the character described, a

jig open at its upper end and provided witha screen adjacent said upper end for supporting value bearing .ore therein, said jig provided with sides enclosing the space belowsaid screen, means for supplying water to said space, two of said sides including flexible diaphragms disposed with sides facing inwardly and upwardly relative to said space arranged and adapted to partially support the water in said space, means for reciproeating said diaphragms for causing general upward movement of the water, and bailies in said .space above said diaphragms and within the water in said space arranged and adapted to modify'the.dir'ectionalmovement of said water.

9. In a construction as defined in claim 8, the

means for reciprocating said diaphragms, including a movable element reciprocably mounted within an enclosed chamber connected to said diaphragm for movement therewith and fiuid pressure means intermittently operative against said element for reciprocating said element and diaphragm.

10. In apparatus ofthe character described, a

, plurality of jig boxes, means for supplying water to within said boxes, adiaphragm mounted'on each box for reciprocation relative theretoyand positioned to provide a support for water in the box, separate hydraulically actuated means connected with each diaphragm for reciprocating the latter upon intermittent admission of liquid under pressure to said hydraulically actuated means, a single source of liquid under pressure,

a liquid conduit communicating with each of said hydraulically actuated means for conducting saidliquid thereto, a rotary valve connecting each conduit with said sourcefor intermittently admitting said liquid to-said'conduits and to'said hydraulically actuatedmeans equal rates per minute, means for rotating said valve, means on each of said hydraulically actuated means for varying the length'of stroke of any diaphragm independently of the others whereby the degree of movement of water in any jig box may be varied relative to the movement of the Water in suchv other while maintaining the number of oscillationsper minute of the diaphragm equal. 10

HARRY C. I-EATI-L,

Images