US824623A - Jig or ore-concentrator. - Google Patents

Description

PATENTED TUNE 26, 1906.

A. o. CAMPBELL.

JIG 0R GRE GONGENTRATOR.

APPLICATION FILED SEPT.19, 1903. BENEWED FEB. 17, 1906.

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PATENTED JUNE 26, 1906.

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UNITED sTATEs PATENT oEEIoE.

ALONZO C. CAMPBELL, OF ASHEVILLE, NORTH CAROLINA. ale. on oRE-coNoENTBAi-on.

i Specification of Letters Patent.

Patented June 26, 1906.

Application filed September 19, 1903. Renewed Februaryl '7, 190B. Serial No. 361.683.

To @ZZ whom it may concern:

Be it known that I, ALONZO C. CAMPBELL,

a citizen of the United States, and a resident of Asheville, in the county of Buncombe and Y State ofNorth Carolina, have invented a new and Improved Jig or Ore-Concentrator, of which the following is a full, clear, and exact description. V

This invention relates to improvements in jigs or pneumatic ore-concentrators, an object being to provide a machine of this character that will be simple in its construction, having no parts liable to get out of order, and by means of which the work may be thoroughly done and rapidly carried on.

Other objects of the invention will appear in the eneral description.

I willdescribe ajig or ore-concentrator embodying my invention and then point out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan view of a jig or ore-concentrator embodying my invention. Fig. 2 is a sectional elevation thereof, and Fig. 3 is a fragmentary section showing the arrangement of the es.

The-machine comprises a boX or casing 1, here shown as supported on a frame 2, and arranged in this These riflies practically form the top wall of a lower chamber 4, and it will be noted the said riles are inclined downward toward the outlet lend of the machine, and thus what I term a converging chamber is formed, the object of which will be hereinafter described.

Above the riifles 3 is a chamber or space 5, which has a canvas or similar flexible cover 6. This cover 6 is secured at its edges to frame members 7, extended around the opening in the top of the boX or at the top of the chamber 5. The frame members are channeled on the outer side, and the material of the cover 6 is drawn tightly in the channellby a binder 8, consisting of cord or other suitable material, and thus an air-tight connection is This` cover 6 fits loosely-that is, its area is considerably larger than the opening through the top of the boX.

The chamber 5 communicates with a receiving casing or chamber 9, and through the top wall of this receiving-chamber a feed- `one valve is necessar box is a series of riffles 3.`

and it not only serves as a pipe l0 extends, the said feed-pipe leading from a bin or source of supply from above and terminating slightly above the riffles, as clearly indicated in Fig. 2. This casing or chamber 9 communicates with a compressor 11 through an opening 12, and this opening is controlled by a valve, here shown as a iiapvalve 13. This valve will be closed and opened by air-pressure, as will be hereinafter described. It may be here stated that only as the stu on the jigbox acts as a valve to check the backflow of air-that is, when the stufl" is buoyed by the air from under the riffles all the passages are thoroughly opened; but at the instant of cessation of the blast the stuii" drops and packs, so that the backward flow is practically cut oif. The compressor also communicates with the converging chamber 4 through an opening 14. This Vcompressor is shown in the form of a bellows, and a distending-spring 15 is arranged within it, bearing against its outer or swinging wall and also against its opposite fixed wall. The compressor is operated at intervals by means of a rod 16, passingloosely through an opening 17 in a strap 18, attached to the movable portion of the bellows. The rod 16 is designed to have a lost-motion movement with relation to the bellows, and

for this purpose I provide it with an adjustable collar 19, between which and a nut or collar 20 on the outer end of the rod the lost motlon occurs.

The rod 16 connects with a crank or wrist pin 21 on a large wheel 22, mounted on a shaft 23, on which is a band-wheel 24. As before stated, this wheel 22 is quite heavy, crank-wheel and a balance-.wheel to balance the motion of the machine, but it also serves as a portion of a device for imparting a slight vibratory motion to the whole machine. motion is caused by a spring yielding hook 25, attached to the bottom of the jig-box and engaging with rasping-surfaces 26, arranged at various points on the periphery of the wheel 22, and these rasping surfaces or areas are preferably removable.

Extended across the jig-box at the discharge end of the series of rlfHes is a dam consisting of a sheet of metal 27. The ends of the dam nt in grooves formed in the side portions of the jig-box. Outward of the dam is a space 28, into which the tailings fall and This vibratory IOO from which the tailings discharge through a pipe 29. At suit able places the jig-box is provided with discharge-pipes 30 for the concentrates.

The ritlies 3 are made of galvanized iron or steel, and at the outlet edge of each riffle there is an upward extension 31. The body portions of the riiiles are overlapped, as clearly indicated in Fig. 3, and adjacent riffles are spaced apart by blocks 32 at the ends. lt may be here stated that the spaces between the ritlies are large as compared to the size of a grain of the material to be treated. The body portions of the rifiies are inclined upward toward the outlet end of the machine. 'lien the riflie-surface is loaded, the material will flow into the spaces and form a natural angle in each space of about forty-five degrees. The material cannot flow through by the force of gravity alone; but it may be induced to flow by additional Jforce or action coupled with that of gravity, as will appear.

The passages between the riiles serve a double purpose-namely, for the flow of the concentrates on the lower surface of therifiles, also for the flow of air or water toward the outlet end of the machine. At intervals along the series of riifles there are long projections 33, which act to stop the too rapid ilow down the inclined surfaces of the riliies, the least dense material thus owing in a more or less thin sheet over the tops, while the more dense stuit is somewhat retarded.

The object of the convergent chamber 4 is to afford an equal pressure at all points in the length of the jig-surface.

Connected to the edges of the riitles toward the inlet end of the machine are pliable iiaps 31. These flaps serve substantially as valves to regulate'and provide the impulse of air. It any portion of the material on the working surface should become too thin or scattered, thus giving too free vent to the passage of air or water, these ilaps act as valves or dampers and close in a greater or less degree or, entirely, by the increased pressure against them, thus automatically insuring a more even pressure in allparts of the bed. Again, the ila-ps or valves serve by sudden impact to cut oil" the blasts instantaneously and give individual particles of material a free fall, thus favoring the desired classification of density. The llaps are adjustable to suit any case by their thickness or degree of pliability and by the spaces, so they may be made sensitive to any given impulse of air or water and respond to suit the (iemands. I The rillles rest on strips 35, secured to the opposite sides of the jig-box, and -above the rillles and secured to said sides are strips 36, provided with channels for receiving the upturned portions of the riilies and holding them in place.

Having described the different parts of the mechanism, Iwill now describe the process of -wrist-pin passes lof the spaces.

operation. Supposing it to be ap lied as an air-jig for washing coal. The coa from the storage-bin above flows through the pipe 10 and enters the jig slightly above the riiiies at the upper end, as before mentioned. Mate# rial falling into the pipe piles upon the riflies in a cone-shaped mass. This accumulation will stop the flow of stuff unless it is removed to give place to a continuous flow. The wheel 22 rotates in the direction indicated by the arrow thereon and through its movements operates the rod 16, which gives a maximum and instantaneous motion to the compressor. The crank and rod then take on a retarded motion until the wrist-pin reaches approximately the point indicated by a, when the bellows is at rest. As the from w to 'y the rod takes a reverse motion and the link between the collars 19 20 slides through or wholly in the strap 18 until the collar 19 strikes said strap. Then the bellows begins to o en, if it has not in the meantime been disten ed by the spring 15, which serves also to keep it distended until it is given an instantaneous impulse, when the crank again passes its lowermost position, a like impulse of air passing through the opening 14, whence into the chamber 4, thence through the spacings of the riiiles, and through the bed of material on the riiiies that is being jigged. The dense stuff settles upon the ritfles according to the Well-known law, and it closes up the spaces and flows between the slightly-inclined surfaces of the riflies and forms a fixed angle that is given to that particular kind of material. The more dense stuff having the preference will repose upon the lowest areas, the lighter stuH rising to the top of the spaces, and it is constantly urged back by the very rapid succession of blasts of air that traverse the upper margins This classiiication into heads of density is further augmented by the tremulous or acoustic vibration given the whole machine, and particularly to the metallic rifiles, by the rasping-surfaces 26 engaging with the spring 25. These vibrations serve another and most necessary purpose-namely, to cause the accumulated dense stuff to flow along the extended margins of the riiiles and into the chamber 4. It keeps the individual particles constantly disengaged, thus favoring nicety of assortment of the dense from the less dense. It also insures an uninterrupted flow into and through the pipes 30. The least dense material--that is, the clean coal-lows down the inclined top surfaces and passes over the dam 27 and drops into the space 28 and ilows out through the pipe 29. When the air passes through the bed of stuii, it accumulates in the chamber 5 and casing 9 and inflates the loose cover 6, so that no air is allowed to escape into the open atmosphere to vitiate itwith dust. At this instant a reverse action of the bellows exhausts IOO IIO

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the air from the chamber, causing the iniiated cover to collapse. The same air is thus used over and over again.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a concentrator, a jig-box', overlappinriilies arran ed therein, the series of rifes eing incline downward toward the outlet end of the box, and a wheel having rasping-surfaces for engaging with a part attached i to the box.

2. In a concentrator, a jig-box, and overlapping riies arranged therein, the lsaid riiles having upward extensions at their outlet sides.

3. In a concentratoi", a jig-box, overla ping and spaced riflies arran ed therein, t e series of rifHes being inclined downward toward the outlet end of the box, and a loose covering for the box arranged over the riies.

In a concentrator, a jig-box, overlapping rilles arranged therein, the saidriiiles aving u turned extensions at their'outlet a wheel having rasping-surfaces for en aging with a part attached to the box.

5. a concentrator, a ji -box having an opening in the top rovided with a flexible cover, a series of ri es arranged in the box, and a compressor having communication with the box above and below the riiies.

6. Aconcentrator, or washer, com rising a jig-box, a series of riiiles arrangedp therein and overla ping, and flaps on the under edges of sai I'i es.

7. An ore-concentrator, com rising a jigbox, ries'arranged therein, a exible cover for the box, a compressor having communication with the box above and below the rifiles, a crank-wheel, and a rod connecting with said crank-wheel and having lost-motion connection with the movable part of the compressor. i

8. A concentrator or washer com rising a jig-box, a series of riflles arranged t erein, a flexible cover for the'box, a compressor communicating with the box above and below the riflies, a valve for the upper opening or communication, a crank-wheel, and .a r'od having connection with' said crank-wheel,

.and a lost-motion connection with the movable part ofthe compressor.

9. A concentrator or washer com rising a jig-box, a series of riflies arranged t erein at a downward inclination toward the outlet end of the box, a flexible cover above the rifles, a dam at the lower end of the riffles, a receiver for material passing over the am, a discharge leading from said receiver, discharging devices leading from the box, and means for causing the circulation of air through the box.

l0. In a concentrator, a jig-box, overlapping riiifles arranged at a downward inclination therein and s aced a tensions on the disc arge e certain of said extensions height than the others, flaps on the lower edges of the riflies, and means for causing a art, upward exges of said. riiiies,

A circulation of ail-.through the box.

1 1. A concentrator com rising a jig-box, a series of riles arran ed therein, a com ressor for causin a circu ation of air throng the box, a wheel Ier operating the said compressor at intervals, -rasping devices on said lwheel, and a spring-hook attached to the'under side of the box for en rasping devices, the said w as a balance-wheel.

12. A concentrator comprising a ji -box, a series of riHes arranged therein and orming the up, er wall of the lower chamberin the box an the bottom wall of theupper chamber in the box, a feed-casingwith whichlthe upper end of the upper chamber communicates, a feed-pipe extended into said casing and terminating slightly above the riiiles, a compressoror causing a circulation of air through the box, and means for operatingsaid pneuaging with said eel also serving Imatic. l

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

I ALONZO o. CAMPBELL Witnesses i D. T. JANErT. KATE B. HAoxNEY.

having a greater

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