US748819A - Concentrator - Google Patents

Description

4leA'rENT-Bn JAN. 5. 1904.

L. R. TULLOGH. GONCBNTRATOR.' A PPLLGAT'ION FILED FEB. 24, 1903.

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`1 ATENTBD JAN. 5, 1904. L. R. TULLooH. CONGBNTRATOR.

APPLIGATION v FILED 1FEI. 24, 1903.-

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No; 748,819. PATENTED JAN. 5, 1904,. L. R. TULLOCH.

CONGENTRATUR.

APPLIGATION FILED PEB. 24. 190s,

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f L. R. TULLOGH.

GONGBNTRATOR.

APPLIGATIQN FILED FEB. 24. .1903.

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i UNITED v STATES Patented January 5, 1904.

PATENT OFFICE.

CONCENTRATOR.

SPECIFICATION forming part Of Letters Patent NO. 748,819, dated January 5, 1904.

' Application file d lielnnary'24I4 1903- Serial No. 144,708. (No model.) n

To all whom it may concern,.-

Be it known that I, LOUIS R. TULLocH, a citizen of the United States, residing at Angels Camp, in the county of Calaveras and State of California, have invented certain new and useful Improvements in Concentrators, of which the following is a specification.

My invention relates to improvements in concentrators, the object of my invention being to provide a concentrator for concentrating precious metals in ore received from stamp-mills, rollermills, or otherwise, which shall be more efficient, of greater capacity, and more economical in the power used thany those heretofore in use.

Y In the accompanying drawings, Figure 1 is a plan view of the concentrator, certain parts being broken away. 'Fig 2 is a side View of the same. Fig. 3 is an enlarged longitudinal section through the rear part of the machine, showing the shaker ,and settlingboxes. A A of Fig. 3. Fig. 5 is an enlarged section on the line B B of Fig. 2. Fig. 6 isa detail perspective View of one of the grip-arms. Fig. 7 is a plan view of the segment gearplate detached. Fig. 8 is a cross-section of the same, broken, on the line C C of Fig. 7.

Referring to the drawings, the base ofthe.

machine comprises the longitudinal sills 1 and the end sills 2. Upon said end sills are erected the posts 3, uponthe upper endsV of whichvare supported the side bars 4 of the frame of the machine, and upon said side bars are secured end bars 5 of said.frame.

The main shaft 6 of thedevice is mounted in` hearings 7, secured rupon the posts on one side of the machine, and is driven Yby a pulley 8 from any suitable source of power. Upon said main lshaft are mounted the usual eccentrics, Working in collars 9, attached byY Fig. 4 is a cross-section on the line preferred, these pillars may be screwed into the sill itself. By screwing the pillars the height of either end of the table can be ad- Vj usted.

By means of the rotary motion of the main shaftY and the eccentrics a lateral rocking "motion .is thus imparted to the belt-frame.

and at their front ends to the side bars of the belt-frame, for Apreventing rearward or downward longitudinal movement of the frame when it is being shaken.

The rear roller 22 is an idle roller; but the front roller 21 is secured upon ashaft 28,

upon which is ixedly secured by a set-screwr 29 a collar 30, having idle arms 31, connected at their ends to a ring 32. Within this ring work the friction-grips, as hereinafter eX- plained. The shaft 28 is continued through said ring, and upon' the end thereof is loosely mounted an eccentricsleeve 33, upon which.

'is xedly secured by a set-screw 34 a collar 35, having a crank-arm v36, adjustably connected, as shown at 37, with a pitman 38, the rear end of4 which .is connected to a wristpin 39 upon the end of acrank 40, extending from the counter-shaft 41. Said countershaft-is driven by means of--a pulley 42 and belt 43 from a pulley 44 upon the rear end of themain shaft.` The crank 36 being consid- Aerably longer than-the crank 40, it results that the rotation of the counter-shaftimparts a rocking motion to said crank 36 and also to the eccentricsleeve 33. Upon the inner end of said eccentric-sleeve is secured to rock l therewith the hub of a plate 45, having formed thereon diametricallyopposite segment-gears 46. These gears rock with the eccentric loosely within the inner surface of the ring 3 2. The rocking motion of said plate and segment-gears is communicated to said ,ring by means of grips, consisting each of a shoe IOC 47, secured to a grip-plate 48. Mounted in I nions of a nut 50. Within said nut Works a bearings 49 on each grip-plate are the trunscrew 51, formed on a stem 52, the inner end of which is revolubly mounted in a radial arm 53. The inner ends of these arms are carried by collars 54, which surround the eccentric, one of said collars being single and the other bifurcated, as shown. The rocking of the eccentric in one direction thus has a tendency to move said arms in and out, one arm always moving inward while the other moves outward. Upon said stems 52 are revolubly carried pinions 55, which engage the teeth of the segmental gears, and said pinions have segmental hubs or extensions 56, which contact with lugs 57, formed upon the stems of the screws, and impart rotation thereto. It will readily be seen that a rotation imparted to one of said screws in one direction will by turning the screw into the nut 50 withdraw the shoe from the inner surface of the ring and permit'said shoe to move freely within said inner surface independently of the ring, while by turning the screw in the other direction the nut will move outwardly from said screw, thus forcing the surface of the shoe against the inner surface of the ring and causing it to firmly grip the same. The shoe is thus caused to grip said ring from two causes: rst, the outward motion of the arm as a whole, due to the rotation of the eccentric within the collar, and, secondly, on account of the turning of the screw, thus causing the nuts to move outwardly.

For the better understanding of the operation of this part of the machine it will be preferable to consider first the action of each arm by itself, and it may be first stated that the operation of the rear arm is to impart to the belt an intermittent forward movement, while the action of the front arm is to impart to the belt an intermittent backward movement; vfurthermore, that each of `these arms may be thrown out of. operation at will or both may be operated. In the latter case they transmit their motion to the ring alternately and a reciprocating movement is given to the belt. Considering first the movement of the rear arm and supposing that the crank is in its lowestposition and is raised rearwardly, the effect is, first, by means of the eccentric to move the rear` arm rearwardly away from the center of the shaft, thus causing the shoe 47 to come closerto the inner surface of the ring. Next, the rear segmentgear will ascend with the crank and in its ascent will cause the pinion gearing therewith to rotate, and by the extension from the pinion striking the lug upon the screw-stem the rotation of the pinion will be imparted to the screw-stem, and since the screw is a righthanded screw and by the rotation of the pinion is revolved in a left-handed direction this will have the effect of drawing the screw out of the nut or, in other words, forcing the nut out upon the screw and pressing the shoe of the grip against the surface of the ring. This will cause said shoe to grip said ring with great pressure and will immediately clamp the same, so that the ring will be carried upward with the segment-gear and a movement in a forward direction will be imparted to the belt. As soon as the crank-arm stops and begins to return the eccentric begins to draw the arm inwardly and also the segmentgear begins to return. It then immediately imparts a right-handed rotary movement to the pinion, which causes the screw to screw into the nut or the nut to be drawn onto the screw, thus withdrawing the shoe from its pressure upon the inner surface of the ring and allowing the arm to drop freely by gravity, so that the backward movement of the cran k-arm is not accompanied by a backward movement of the belt. In like manner the upward and rearward movement of the front segment-gear will cause the corresponding shoe to engage the ring and move it backward, while upon its return movement the shoe will be released from the ring, so that no corresponding forward movement of the belt will take place. Since the operative movement of each segment-gear is its movement in an upward direction and since when the rear segment-gear is moving upward the front one is moving downward, and vvice versa, it follows that these opposing movements cannot act simultaneously, but they must necessarily act alternately. When both arms are operating, the belt will move forward and backward alternately. To limit the amount of either movement, I provide a stop 60, preferably formed of two rubber blocks supported upon an arm 6l, pivotally mounted around the eccentric 33 and having another arm 62 extending to the opposite side of the ring and then bent across the face of a curved rack 64, said bent portion having a spring-actuated dog 65, which can be arranged to engage any of the teeth of said rack, thus adjusting the angular position of the stop. When the stop is placed in its lowest position, the corresponding arm is given its greatest amplitude of motion and the maximum movement is imparted to the ring, and when the stop is raised to its highest position the motion of the arm is not suficient to close the grip upon the ring. In the latter case the arm is rendered inoperative to turn said ring or to move the belt.

Generally it will be necessary that the rear stop shall be lower than the front stop, thus IOC) IZO

giving a greater amplitude of motion to the rear arm than to the front arm, the effect of which will be to give a greater forward than backward motion to the belt, so that there will be resultant progressive movement to the belt. Occasionally, however, it is necessary to move the belt backward-as, for instance, when there is an overflow of sand and water on the sulfurets. In formermachines this has been done by hand, vbut with my apparatus it can be done by throwing out of operation the rear arm, the eect of which will be that there vwill be no forward movement of the belt and thefront arm only will operate, thus moving the belt backward.

An important feature of my invention re,

sides in the fact that in Athe same apparatus considerable preliminary treatment is given to the ore before it is treated by the belt. For this purpose I provide a shaker-box 70,

lhaving rollers 7l mounted upon the ends of Asaid rear bar having adjustably secured thereon a roller 80, which is engaged in succession by a series of cams 81 upon the edge of a roller 82 upon the counter-shaft 41. I have herein shown four such cams; but the number may be varied at pleasure to suit different conditions. A spring 83, coiled around said shakerbar and compressed between the bearing 79 and the connection of said bar with the rear wall of the shaker-box, returns said box' forward when it has been pressed back by one of said cams. Thus the revolution of said counter-shaft imparts a rapid forwardand-backward movement to the shaker-box. Over said box and mounted upon the sides thereof is secured a feed-trough 84, having a series of feed-holes 85, and upon said trough again are mounted hoppers 86, into which the ore is fed. Each hopper is provided with ay series of holes corresponding in number with the number of tables whichgare used in the'shaking box. I have in the present instance shown three such tables; but less or more may be used, as may be desired. One of these holes 87 in each hopper-the one in the present instance nearest the front of the machine-discharges the ore into the trough 84, and from the trough the ore is distributed through the feed-holes 85 upon the upper table 88. The second hole 89 in each trough discharges onto the second or next lower table 90. The third hole 91 in each trough dis` charges onto bottom 77, which forms the third table. Under the first and second tables are provided plates lOl,one corresponding to each discharge opening through said table. The object of these plates is to distribute evenly onto the next lower table the ore which is discharged through the table above. For this purpose each plate is arched or convex upward, so that the material tends to ilow to its sides. The material is intercepted by longitudinal slots 102 and drops through said slots onto the table below it. Any material which fails to drop through the slot nearest to the discharge opening will pass outward and drop through the next slot, thus evenly distributing the material onto the table to which it is intended to be fed. The ore is thus distributed on a plurality of tables, all

of which are being shaken at the same time..

4These tables all slope rearwardly, so that the water and the lighter particles of the material being fed dow ed said tables to the rear, while .the sulfnrets and heavier particles are by their greater specific gravity shaken or moved in a forward direction. They are thus gradually fed forward, the sulfurets and heavier particles from the upper table being fed over the front edge of said upper table onto the next lower table,'

and so on to the third or'lowest table'. From said lowest table all of the particles thus separated by their gravity fall through aslot or opening 92 between the-edge of the bottom 77 and the front side 75 of the box and drop rinto a delivery-trc'mgh` 93, from which they are fed without splashing by means ot' an apron 94 onto the concentrator-belt. The particles which have not been thus separated and delivered directly onto the concentratorbelt pass to the rear and are discharged over the rear edges of the several tables into the rear compartment of a settling-box 94, supported on the belt-frame. Said settling-box is divided by transverse partitions 95 into compartments, as shown, each compartment extending the width of the box. These partitions extend entirely to the top and bot-' tom alternately. Therefore the material fed into the first compartment escapes therefrom underneath the bottom of the first partition; then, the second partition not extending to the full height of the sides ot' the box, the material escapes from the second compartment over the second partition; then under the third partition, and so on. During the whole Aof this time the settling-box, resting upon the belt-frame, has the same motion as said frame-that is to say, a transverse reciprocating motion. This has the effect of causing the heavier particles to settle down in the tlrst compartment, while the lighter particles iiow on to the next compartment. Thus the heavier particles find their way to the bottoms of the several compartments. They escape therefrom through slots 96 in the bottom of the settling-box and are discharged on the concen-trator-belt. These slots may be varied in width to suit the feed by means of an adjustable plate 97, which lies on the bottom of the settling-box and has slots 98 corresponding to the slots in said bottom, and by adjusting the position of said plate forward or backward the openings through which the heavy particles can drop will be enlarged or diminished, as desired. The residue which Hows into the last compartment, the one to the front-of the machine, will iiow into a discharge-trough 99, which discharges at the side of the machine.

IIO

IZG

In order to prevent the material from packit in a loose condition. Thus, first, by means of the shakingtables, and, secondly, by means of the settling-box, all of the ore is treated before being delivered to the concentrator-belt, so that a great part of the work is already done before the belt begins to operate upon the ore. For this reason a much greater amount of material can be treated and much more economically than with previous forms of concentrators.

In front of the feed-trough 84 is provided a pipe 103 with perforations 104 for the purpose of distributing a supply of clear water to the several tables to assist in separating the sulfurets and other particles from the debris.

105 represents the usual water-box, supported upon the frame over the belt and having the usual perforations 106 for permitting the water to flow onto the belt.

I claim- 1. In aconcentrator,the combination ofthe belt, means for oscillating the same, a percussion-box, means operated with the oscillating means for shaking the box longitudinally of the belt, said box comprising a hopper into which the material is fed, a vertical series of tables onto which the material is successively distributed, and individual longitudinallyslotted plates above said tables for distributing the material evenly over the tables, substantially as described.

2. In a concentrator,the combination of the belt, means for oscillating the same, a percussion-box, means operated with the oscillating means for shaking the box longitudinally of the belt, said box comprising a hopper into which the material is fed, a vertical series of tables onto which the material is successively distributed, and individual longitudinallyslotted arched plates above said tables for distributing the material evenly over the tables, substantially as described.

3. In a concentrator,the combination of the belt, and means for imparting oscillat-ion thereto, of a-percussion-box arranged to feed the material upon the belt, and operated with the oscillating means, said shaker-box comprising afeed-hopper for feeding the material, and a series of tables, said hopper having at its bottom independent chutes leading to the several tables, and slotted plates at the bottom of said chutes for distributing the material onto the tables, substantially as described.

4. In a concentrator, the combination of the belt, and means forl imparting oscillation thereto, of a percussion-box arranged to feed the ore upon the belt, and operated with the.

oscillating means, said percussion-box comprising a feed-hopper for feeding the material, and a vertical series of tables, said hopper having at its bottom independent chutes,

` each leadingr to a corresponding table through the tables, above it, of the series, substantially as described.

5. In aconcentrator,the combination with a belt, and means for oscillating the same, of a shaking settling-box divided by transverse partitions into compartments, said partitions extending entirely to the top and bottom alternately whereby the material is compelled to travel in a vertically-zigzag path through the compartments, said box having slots in its bottom discharging onto the concentratorbelt, and bars in the compartments extending longitudinally of the machine to prevent the material from packing, substantially as described.

6. In a concentrator,the combination ofthe traveling belt,means for advancing the same, means for oscillating the same,a shaking box into which the material is fed, means operated with the oscillating means for imparting alongitudinal movement to said shaking box, said shaking box comprising a series of tables onto which the material is fed from the hoppers, said tables discharging at one end upon the concentrator-belt, and a settlingbox into which the tables discharge at their other end comprising a series of compartments divided by transverse partitions, extending entirely to the top and bottom alternately whereby the material travels through said compartments in a vertically-zigzag path, the bottom of said settling-box having slots for discharging onto the concentrator-belt, substantially as described.

In witness whereot` I have hereunto set my hand in 4the presence of two subscribing witnesses.

LOUIS R. TULLOGH.

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