US1082960A - Slow-speed chilian mill. - Google Patents

Description

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Patented Dec. 30, 1913.

QW um Patented De@.3o,1913.

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COLUMBIA PLANGGRAPH ce., WASHINGTUN, D. c.

C. C. LANE. i. SLOW SPEED GHILIAN MILL. APPLICATION FILED AUG. 7, 1909.

1,082,960. v Patented Dec. 30, 1913.

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COLUMBIA PLANonRAPl-I co.. w NNNNNNNNNNNN c.

C. C. LANE.

SLOW SPEED GHILIAN MILL.

APPLIOATION FILED AUG. 7, 1909.

1,082,960. A Patented 1390.30, 191s.

6 SHEETS-SHEET 4.

COLUMBIA PLANOGRAPH co.. WASHINGTON. D. c.

G. G. LANE.- -SLOW SED OHILIAN MILL.

APPLIOATIQN FILED AUGJ, 1909.

Patented Dec. 30, 1913.

6 SEEETB-SHBET 5.

COLUMBIA M .ANoanAPl-l Co.. WASHINGTON. D. c.

SC. C. LANE SLOW SPEED HILIAN MILL.

APPLICATION FILED AUG. 7, 1909 1,082,960. f Patented 1390.30, .1913.

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CHARLES C. LANE, `OFA LOSANGELES, CALIFORNIA, ASSIGNOR TO LANE MILL AND MACHINERY COMPANY, 0F LOS ANGELES, CALIFORNIA, A CORPORA- TION OF CALIFORNIA.

SLOW-SPEED CHILIAN MILL.

To all whom t may concern.'

Be it known that. I, CHARLES C. LANE, a citizen of the United States, residing at Los Angeles, in' the county of Los Angeles and State of California, have invented new and useful Improvements in Slow-Speed Chilian Mills, of which the following is a specification.

This invention relates to mills for crushing ore and recovering precious metal therefrom, and it more particularly relates to improvements in that type of ore crushing and treating mills commonly known as the Chilian mill, in which a roller is driven around an annular track inside an annular pan in which the ore, tog-ether wit-h water, is fed. In this class of mills it is desirable that the face of the roller that rests on the track in the bottom of the pan shall have a determined grinding action relative to.

such track, as the roller moves around the center of the pan. This grinding action may be increased or decreased by changing the angle of the axle of the roller relative to t-he track.

l/Jith Chilian mills as at present constructed itl is diilicultto determine just what angle is most desirable for operation upon the ores. It may be possible that with some characters of ore better work will be done with the rollers in one position than in other positions.

The Chilian mill as heretofore constructed, is recognized as having certain features of superiority over other mills for crushing to extreme iineness and as affording superior amalgamation, but it is subject to certain objections, and an object of this invention is to avoid such objections.

An objection to Chilian mills as heretofore constructed is that the tires of the rollers are liable to wear concave or grooved, and very heavy rollers are required to effect the crushing. The excessive weight of such rollers causes a heavy friction against the collars or devices that hold the rollers against the centrifugal pressure.

An object of this invention is to provide for making the rollers comparatively light but strong, and to provide for applying the crushing weight of a mass of rock, scrapiron, or other material in such a manner as to bear down equally on all the rollers.

Specification of Letters Patent.

Application filed August 7 Patented Dec. 30, 1913.

, 1909. Serial No. 511,816.

An objectof this invention is to provide a Chilian mill that is capable of adjustment for experimental purposes to determine the angle at which the rollers should be set with the track, in order to secure the greatest etliciency with any certain ore or with all ores, and to maintain the maximum saving of values and maximum output with minimum power; also to provide a Chilian mill of this character having a minimum weight for the heaviest pieces, and also making provision for readily knocking down the machine and putting the same together, so that the machine can be shipped in knock-down condition and may be carried by mules over mountain-trails.

Another object of the invention is to so construct. the knock-down machine that a maximum strength of machine can be secured with minimum weight of structural parts.

A further object is to devise a cheap and simple construction whereby the mill may be provided with aA solid combined base and launder that may be mainly constructed of materials found on the ground.

Other objects of the invention are to make provision whereby the ore fed to the machine will be automatically sampled; to make provision whereby the copper plates for amalgamation may be taken out and replaced without stopping the mill; to make provision for automatic regulation of the feed.

Another object. is to provide a mill capable of ready adjustment as to height and character of discharge, so that the same mill may be quickly changed from a high overiiow discharge to a low screen discharge, and vice versa.

Other objects and advantages may appear from the subjoined, detailed description.

The accompanying drawings illustrate the invention.

Figure l is a perspective view of a Chilian mill constructed in accordance with this invention. Fig. 2 is a perspective, fraglnental detail illustrating one of the removable amalgamating plates. Fig. 3 is a plan of the mill shown in Fig. l. Parts are broken away for clearness of illustration. Fig. el is a perspective view of the hopper and weight-holder or tank, parts being omitted to expose structural features and portions of the main frame. Fig. 5 is a plan of the portion of the mill below the weight-tank. Fig. 6 is a fragmental plan of the main frame. Fig. 7 is an elevation partly in section on line mT-7, Figs. 3 and 5. Portions are broken away for clearness of illustra tion and to contract the view. Fig. 8 is a fragmental perspective detail of one of the metal stanchions with part of a screen-sill. Fig. 9 is a. fragmental elevation partly in section on line r9-m9, Fig. 10, to illustrate the construction of one of the roller-trucks. Fig. 10 is a plan view of one of the rollertrucks, a fragment of the track being shown. Section taken on line m10, Fig. 9. Fig. 11 is a diametrical section of one of the rollers fixed on its axle, a fragment of which is shown partly in section. Figs. 12, 18 and 14 are diagrammatic views showing different positions of one of the trucks relative to the track. In Fig. 12 the roller is shown adjusted at a position in which the rollers of former mills were capable of being adjusted, and in which adjustment the tire of `the roller is liable to wear concave or to wear into irregular grooves. Fig. 18 shows the roller adjusted for rotation and revolution to the right in the direction of the arrows, the adjustmentbeing such as to avoid the concaving and grooving that is liable to occur when the adjustment is that shown in Fig. 12. Fig. 14 shows three adjustments of thetruck for rotation and revolution to the left in the direction of the arrows; the purpose of the different adjustments being to produce pulp of different grades of lineness without changing the screens or overflow.

The base 1 is a monolith having an upward extension at the center and is constructed of reinforced concrete, the lower reinforcements 2 of which may be circles or a coil of wire-cable or any other suitable metal reinforcement; the upper reinforcements 3 being coils of bent and twisted wire, the reinforcements 4 being upright rods, and the reinforcements 5 coils or circles of bent and twisted wire. Said base is channeled as shown at 6 to form a launder having a discharge-opening 7 at one side of the machine. The inside curbing 8 may be a band of sheet metal, the bottom of which is anchored in concrete and may be bent as shown at 9. Said curbing is reinforced by an upward extension` of the concrete base, and inside the curbing 8 the reinforced concrete is depressed to form a basin 10, at the center of which an upright hollow reinforced concrete center-post 11 is formed of said extension, the same being bound with a metal band 12 which is turned smooth and cylindrical and is set with its axis vert-ical above the center of the base.

Outwardly-inclined stanchions 13 which' may be made of H or I steel, as clearly shown in Fig. 1, are anchored in the concrete and receive between them the frames 14 of the screens 15, said frames being fitted into the grooves 16 in the sides of the H or I beams, thus to form the outer curbing of the mill from which the screen-frames and screens may be removed and replaced at will.

The stanchions are bonded together by cast metal sills a the lower parts of which are embedded in the concrete. Upon these sills the screen-frames rest. Said sills are provided with a lip 5 inside the screen, and with a ledge outside the screen and partly embedded in the concrete so as to avoid leakage.

The stanchions 18 are set in a circle andthe outer curbing thus formed by the stanchions, sills, and screens may be of circular, octago nal, hexagonal or other approximately-circular form. Vithin the outer curbing thus formed is the track 17V bedded in the rein forced-co-ncrete base and composed of steel bars 18 bent in circular form and clamped together by clamps 19 at the bottom; the surface of the track thus formed lying in a horizontal plane and flush with the annular face 20 of the concrete base between the track and the inner curbing 8, said track being elevated above the annular face 21 between the track and the outer curbing so that the pulp will flow from the track toward the outer curbing; the channel outside the track serving to hold a body of quick-silver for amalgamating purposes; an object being to keep the quick-silver as much as possible from under the rollers 22 which are preferably of the same width of tread as the top of the track and are provided with stub axles 23, each axle projecting from both sides of its roller and being mounted in boxes 24 and adjustable endwise in said boxes.

Adjusting screws 25, 25 that engage caps 26, 26 are provided at each end of the axle for the purpose of shifting the axle endwise to shift the wheel, to make the same register with the track. In the form shown, the ends of t-he axles are provided with screw-threaded seats 27, 27 respectively into which the adjusting-screws 25, 25 are screwed, said adjusting-screws being provided with heads 28, 28 to engage the outside o-f the caps 26, 26 and having smooth, cylindrical portions 29, 29 extending through perforations 30, 30 in the caps. The caps are hollow to accommodate the ends of thefshaft 23 to allow said shaft to shift endwise. One of said caps 26 bears against the outer boxing 24, and the inner cap 26 is supported by a ball-bearing thrustplate 31 which is supported by the inner boxing 24. In order to shift the axle and its wheel, the adjusting-screw 25 or 25, as the case may be, on one side may be loosened and the other adjusting-screw 25 or 25, as the case may be, on the other side may be tightened, thus drawing the axle and the wheel in the desired direction. The purpose of the ball-bearing thrust-plate 3l on the inner end o-f the axle is to allow the axle to rotate freely in spite of the strain and friction produced by centrifugal force as the roller revolves. The boxes 24 and 24 are mounted in vertical ways 32, 32 that are connected with a horizontal truck-frame 33 which surrounds the roller and is composed of the horizontal side-beams 34 formed of steelplates reinforced by angle-bars 35, 35 and plates 36, 36 at top and bottom, and connected bystay-bolts 37 and the perforated draw- plates 38, 38. Said draw-plates are fastened to the top angle bars and plates 35, 36 by bolts 39. The ends o-f the side-beams 34 are provided with flat horizontal seats 40 for the draw-plates. The journal-boxes 24 and 24 rest on the axle 23, and each may be provided with a lower member 4l fastened to its box by bolts 42.

The side beams 34 of the truck-frame are adjustably and resiliently supported by the boxes 24 and 24, the springs 43, .43 being mounted on the boxes 24, 24 in the vertical ways beneath the heads 44, 44 which rest on the springs, and into which are screwed supporting- screws 45, 45, the upper ends of which are supported by head-blocks 46, 46 upon which are yokes 47 that form the linings of the upper ends of the ways 32, 32 and that support the top-plates 36 of the side-beams 34. Said yokes or linings 47 are riveted to theplates of theside-beams 34 and fit the undersides of the top-plates 36. Said supporting- screws 45, 45 are provided with perforations 48 to receive a lever by which said screws may be turned respectively, to raise or lower the side of the truck-frame to which the screw appertains, thus to adjust the axles to desired level position so that the rollers will rotate in vertical planes.

Each of the t-ruck-frames 33 is constructed after the manner just described, and by ad'- justing the screws 45, 45 the truck-frames may be raised or lowered in order to level the large driven-gear 49 which forms a part of the main-frame. Said driven-gear is composed of segments 50 having inwardly-extending lugs 51 fastened together by bolts 52; and said segments are provided on the inner side with longitudinal ribs 53 to which angle-plates 54 of the main-frame are secured at intervals by bolts 55. Upon said angle-plates 54 there are secured the outer beams 56 of the main-frame, said outer beams preferably being I-beams to the webs of which the angle-plates 54 are fastened by bolts 57 that also pass through supportingplates 58 that are bolted to the crossbeams 59.

In the form shown, the main-frame is hexagonal and the cross-beams 59 are arranged in pairs, the members of each pair being at an angle to each other and fastened together at their inner ends by corner-plates 60. Said corner-plates 60 are bolted to an inner triangular frame composed of three inner beams 61 which are internally supported by the corner-braces 62. Inside the triangular frame and fastened thereto are antifrictionwheels 63 having vertical axes and journaled o-n brackets 64 xed to said frame. Said wheels are arranged in a circle to run on the band 12 of the center-post 11, and the mainframe with the large driven-gear 49 is thus V,journaled on the center-post so that it and the trucks can freely travel therearound. The large driven-gear meshes with a long pinion 65 mounted on an upright shaft 66 which may be driven in any suitable manner, as by the bevel-gears 67, 68.

The tops of the outer-beams 56, crossbeams 59 and inner-beams 61 of the main- `frame may be in a common horizontal plane, and to the cross-beams 59 are secured perforated draw-heads 69 by means of bolts 70. King-bolts 7l are provided, preferably a pair 'for each draw-head, to extend through the perforations in the draw-head and through Itwo of the perforations 72 in the draw-plate 38, so that each truck is fastened by four king-bolts that may be inserted through various perforations 72 of the draw-plates 38. By this means each of the truck-frames may be turned to any angular adjustment desired so as to cause the axles of the rollers 22 to extend radially or tangentially relative to the track, as occasion may require. The trucks can be also moved bodily forward and backward; itbeing understood that the perforations 72 may be arranged in rows to receive the king-bolts in any of the positions found desirable in actual practice. In the drawings, three rows of perforations are shown.

It is a feature of this invention that the crushing roller axle is fastened to its truck by means whereby the tread line of the roller may be adjusted to any desired angle relative to the circular track, so that the wearing of the roller and track may be corrected by adjusting the roller to bring the tread line into different angular relations to the circular track. It is also desirable from time to time that the roller should be adjustable in spacial relation to and fixed in different angular relations to the track and the wall of the pan so that the kick-back of the material at the rear of the roller may be properly directed. That is to say, when the rear side of the roller is close to the wall of the pan the tendency of the upwardly moving rim of the roller is to throw or kick back the pulverized material in an upward and outward direction so as to discharge more positively than .when the rear side of the roller is farther from the outer wall of the pan. Consequently when the rear'side of the roller is near the outer wall of the pan; co-arser material will be discharged over such wall than when said rear side of the roller is farther from the wall of the ian.

l I have discovered that in order to regulate the iineness and coarseness of the output of the mill without the use of screens and also at the same time to provide for correcting the tendency to uneven wearing of the roller and plate, it is necessary that the roller shall be shiftable for adjustment both as to the direction of rotation in angular relation to the track and also as to position of the .rear side of the roller relative to the outer wall of the pan. I have discovered this principle of operation and adjustment and have discovered that appropriate adjustment to provide a mode of operation having the desired efficiency cannot be attained by a mere pivotal mounting of the roller and provision of means in connection therewith to fix the roller axis relative to the wheel or other' element which revolves the roller around the center po-st; and my mill in this respect differs from all other mills of the roller type in that the roller is shiftable both radially and tangentially relative to the circular track and the outer circular wall of the pan and is not merely adjustably secured by a pivotal mounting and fastening means.

Referring now particularly to Figs. 12, 13 and 111 it is to be noted that in Fig. 12 the axle 23 is radially arranged; that in Fig. 18 the axle is shifted bodily forward, so that it is no longer radial but is parallel with a radius of the track; and that whereas in Fig. 12 the outside corners of the wheel are equidistant from the track, that in Fig. 13 the forward outside corner is farther from the track than the rearward outside corner. In Fig. 14 the wheel shown in solid lines is shifted bodily in the direction opposite to that shown in Fig. 18 and the axle is parallel with the radius. These three adjustments are effected by shifting the bolt 71 from t-he central rows of holes in Fig. 12 forward for the adjustments in Fig. 13 and backward for the adjustments in Fig. 1/1.

In the adjustment of Fig. 18 the grinding action between the roller 22 and the track 17 is increased over that in Fig. 12, and said grinding action may be maximized by turning the axle into angular relation with the radius as indicated by the broken line position in Fig. 13. In Fig. 14 further variations o-f the adjustment are indicated by the broken and dotted line positions. Assuming that the direction of the roller is the same in Figs. 13 and 111 the roller in Fig. 13 would discharge from the pan finer 'material than with the adjustment shown in Fig. 14. By means of the two series of.

symmetrically arranged transverse and longitudinal rows of perforations 72 it is possible to shift the roller bodily outward and inward and also at the same time forward or backward, and furthermore, to swivel the roller on various vertical axes and thereby to change the roller in Vits angular and spacial relations to the pan wall and the track,` so that a great variety of adjust ments may be secured for the purpose hereinbefore outlined. By this means the roller can be adjusted with great accuracy to grind the material to the required fineness. Some ores require to be ground extremely ne and other ores must be ground to a vless degree of fineness in order to obtain the best results of concentration or other treatments; and by the adjustment shown the mill man is able to produce the character of pulp required. The weight of the tank and its load is applied at the front and rear ends of the trucks respectively beyond the front and rear faces of the roller, and in this way the force'to drive the rollers is applied close to the level of the axles 23 of the rollers, thus insuring against displacing the rollersunder the severe strainsto which they and their bearings are subjected. By this means it is made possible to employ light rollers with a heavily loaded weight tank,thus greatly increasing the capacity of the mill.

The cross-beams 59 rest directly upon the draw-plates 88, and on the top of said crossbeams above the ends of the draw-plates are mounted stanchions 73 upon which are mounted frame-sills 74 on top of which are sill-beams 75 that carry'the tank-sills 7G of the floor 77 of the weight-tank. Said weight-tank is formed by said fioor 77 and the outer and inner walls 78, 79 fastened thereto. VThe weight-tank is thus mounted on and carried by the main-frame and the adjustable trucks and their rollers, and revolves therewith.

The inner wall 79 of the weight-tank is annular, and above the same is a funnelshaped sampler 80 having a central opening 81 below which is a distributing-hopper 82 that rests on the sill-beams 7 5 and is provided with downwardly-opening distributing-pipes 83, three in number in the present instance, one for each of the crushing rollers 22.

The distributing-hopper 82 is provided with a conical center 84; that slopes outwardly and downwardly to the mouths of the distributing-pipes 83; and the outer wall of the hopper terminates at its lower end in a hollow cone 85 from which the central cone 84 springs at the mouths of the distributing-pipes 83. Said distributing-pipes extend down through the main-frame and terminate in vertical limbs 86 in front of Q the rollers respectively, there being three such pipes when the machine is provided with three rollers.

The hopper 82 is provided with a flange or with legs 87 that rest on the plates 75, and the weight-tank is removably mounted upon the means that support it, so that when the weight-tank is removed the hopper 82 and the distributing-pipes 83 may be bodily lifted from the apparatus. Said distributing-pipes may be fastened in any suitable manner, as lianging or screwing into the lower portion of the hopper 82. In the drawing, the distributing-pipes are shown `as being screwed into the distributing-hopper.

The sampler S0 is circular and provided near its rim with a. perforation 88 above which is the open funnel-shaped intake 89 that leads into the sampling-pipe 90 which extends radially inward and aslant clownwardly and discharges into a stationary central sampling-pipe 91 that is inside the concret-e center-post and extends thence downwardly through the concrete base 1 to discharge outside the same.

The sampling-hopper 80 may be constructed of sheet-metal or other suitable ma.- terial, and comprises an outer cylindrical wall 92 and a sloping floor 93, the latter of which terminates in an annular central lip 94 to lit inside the distributing-hopper 82.

The floor of the weight-tank may be made of wedge shapedl segmental pieces 95 which rest at their outer ends fon the internal iiange 96 of the outer wall78 of the weighttank, and at their inner ends rest on the hexagonal frame formed by the inner tanksills 76. i Q

Above the level of the mouth 89 of the sampling-pipe 90is provided a spout 97 of.

the automatic ore-feeder 98 of a common type, the same being operated by a connecting-rod 994 that is pivoted to a verticallymoving slide 100 that is mounted on a standard 101 and normally raised by a spring 102 and adapted to be depressed by a roller 103 that is arranged in the path of cams 1041 that are adjustably fastened to the outer circular wall 7 8 of the weight-tank by pivots 105 and clamp-bolts 106 which extend through slotst 107 ini the cams so that said ,cams may be adjusted down or up to move the roller 103 downward more or less, as it is desired to increase or decrease the amount of feed.

In practical operation, when the shaft 66 is appropriately rotated, the main frame with the large driven-gear 419 will be rotated in the direction of the larger curved arrows in Fig. 5, thus moving the rollers in the directions indicated by the arrows thereon. By providing between the weight frame and the roller axles horizontal truck frames that surround the'rollers and through which the rollers extend upward through the rotary frame, the power to revolve the rollers may be applied nearer the plane of the roller axles than with former constructions and the liability of racking the frame is minimized thereby greatly increasing the life of the apparatus.

Since the thrust rollers 63 are mounted on vertical axes and engage the outer face of the circular track formed by the metal band 12, the tendency of the operating power to displace the rotary frame is counter-acted without interference with the descent of the rotary frame as the track 17 and rotary tires wear away.

In practice, the weights 108 may be rocks, scrap-iron, or other suitable material conveniently available to give the required pressure to the rollers 22. rlhe rollers 22 are `constructed for convenient knocking down and reassembling so that they may be transported over mountain-trails by pack-animals. For this purpose there are provided for each roller two ianged thimbles 109, 110, the combined length of the sleeves 111, 112 of which is less than the tread of the roller. The flanges 113 of the thimbles are perforated to receive bolts 114, and the sleeves 111 are arranged to tightly fit the stub-'axle 23. The inside thimble 110 is fixed to the stub-axle 23 by suitable means as a bolt or pin 115. The outer thimble 109 is adjustable along the stub-axle which has a feather 116 that extends into a groove 117 in the sleeve of the outer thimble. A key 118 in the key-way 119 in the stub-axle 23 and the inner thimble 110 rinly fixes Vthe thimble 110 to the stub-axle.

Between the flanges 113 are tted together a plurality of segments 120 which may be of wood or other suitable material to form the body of the roller, said roller being incased at its sides by annularmetallic sideplates 121 fastened to said body by bolts 122 that pass through the side-plates 121.

The tire ofthe roller is formed in a plurality of rings 123, 124C, 125, each of which may at irst be made in the manner of constructing the tires of locomotive-drivers, and when turned perfectly true may be cut with a hack-saw into a number of segments suitable for packing for carrying over a trail.

The tire-rings before being cut into segments are fastened together, and dovetail ways 126 are cut transversely across the same to receive dovetail keys 127. Then the rings may be separated and each out into segments which will lap joints with the segments of the rings when the rings and the keys are again assembled. 1n mills not required to be packed, the rings need not be cut, and each tire may be made in a single piece.

The tire is fitted onto the wooden body of t-he wheel and tightened by wedge- like shims 128, 129, which may be driven in from op-y 109 will be brought into position and slid into the hole 130 with its groove 117 over the feather 116. This thimble slides on the shaft 23 and the feather 116, and when the bolts 114 are inserted through the flanges of both thimbles and the nuts of said bolts are tightened, the outer thimble will be drawn toward the inner thimble, thus Y clamping the wooden segments of the Wheel tightly together.

When the rollers are completed they will be assembled in their boxes in the truckframes, and then the main-frame will be mounted on the draw-plates of the truckframe as hereinbefore described.

vWhen the parts have all been properly assembled and adjusted, the ore-feeder 98 will be supplied with ore broken to appropriate size, as for instance, from rock that willgo through a two-inch ring down to any finer size, water being added thereto in the usual manner, as through the pipe 131 leading into the spout 97, so that ore fed into said spout will be carried by the water down into the revolving sampler 80 and will flow down the funnel-shaped floor thereof and be distributed evenly around the central opening 81 through which it will flow into the distributing-hopper 82. The spout is arranged vertically above the pat-h of the intake 89 so thatJ when the intake passes under the spout the material flowing through the spout will flow into the intake of the sampler and will flow down the pipe 90 and out' through the central pipe 91 and through the base to the outside thereof where the samples may be recovered for the purpose of testing. As the main-frame, Weight-tank, etc., revolve, the cams 104 operate the roller 103 and depress it so as to effect the feeding.

If the ore is abnormally hard to crush so that the amount fed into the pan exceeds f that which will flow out through the screens 15, the accumulations on the track will raise the rollers 22 and consequently the cams 104 so that they will not depress the roller 103 to the former extent; thus diminishing the amount fed at each operat-ion until the crushing of the ore is diminished and consequently the discharge through the screens is such as to again reduce the accumulations on the track to the normal. lt is thus seen that the regulation of the feed is made automatic and that by raising or lowering the rear ends of the cams the depth to which material may accumulate on the track may be accurately regulated.

I claim 1. ln a Ohilian mill, the combination with a pan, a circular track in the pan, a crushing roller on the track and means to revolve the crushing roller, of means shiftably connecting the crushingroller with the means for revolving said roller, said connecting means being adapted to allow the roller to be swiveled on various vertical axes and to hold the roller adjusted to and fixed indifferent positions with special and angular relation to the track; said roller being bodily movable toward and from the axis of revolution and the wall of the pan substantially as and for the purpose set forth.

2. An ore-crushing mill comprising a pan, a circular track in the pan, trucks provided with rollers and frames, the rollers resting on the track, a rotary-frame resting on the truck-frames, said truck-frames being adjustable relative to the rotary-frame, means for rotating the rotary-frame, a circular hopper carried by the rotary-frame, a central distributer carried by the frame to receive the material discharged by the hopper, pipes leadingv from the distributer to discharge material on the track between the rollers, a sample-intake located in the hopper, a pipe leading from the sample-intake to the center of the mill, a stand-pipeV at the center of the mill to receive the discharge from the sample-pipe, an outlet communieating from the stand-pipe to the outside of the mill, and a stationary feeding device arranged above the hopper and above the path of the sample-intake.

3. In an ore-crushing mill, the combina- Y tion with a rotary-frame and a circular track, and rollers on said track, of truckframes for said rollers, each being provided at its ends with'perforated plates, the perforations being arranged in series of longitudinal and transverse rows, the rotary-frame being mounted on said plates, and pins carried by the rotary-frame and adapted to be inserted in the holes in saidm plates for the purpose of variously angularly and spacially l means for adjusting the rollers transversely 130 of the trucks, and means to apply power to the rotary frame to drive the rollers,

5. In an ore-crushing mill, a circular base of concrete containing a launder with a 5 launder-channel opening outwardly therefrom, acentral raised portion inclosed by removable screens, a circular track therein, a center post arising therefrom, a conduit inclosed therein, crushing rollers on said 'lo track upholding on their axles a rotatable frame, and aV Weight pan containing inlet and distributing means leading to the said conduit and to the front of said rollers, and means to rotate said frame and rollers.

ln testimony whereof, I have hereunto set 15 my hand at Los Angeles, California, this 31st day of July, 1909.

CHARLES C. LANE.

AIn presence of- JAMES R. ToWNsEND, G. M. LANE.

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

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