US1343292A - Non-clogable self-cleaning screen - Google Patents

Description

A. G. TURNER.

NON-CIQOGABLE SELF CLEANING SCREEN. 7

APPLICATION FlLED JAN.19,1918.

1,343,292. I Patented June 15,1920.

2 SHEETSSHEET l.

El mumgmm IIIIimIYI/IYIY/EIK- A.'G. TURNER.

NON-GLOGABLE SELF CLEANING SCREEN.

APPLICATION FILED JAN. I9,-l9l8.

Patented June 15, 1920.

2 SHEETS--SHEET 2.

uuantoz ALONZO G. TURNER, or HANKSVILLE, UTAH.

NON-CLOGABLE SELF-CLEANING SCREEN.

Specification of Letters Patent. Pate t d he 15 1920,

Application filed January 19, 1918. Serial No. 212,727.

My invention relates to sifters and screens for use in the process of grading, assorting and separating gravel, metalliferous minerals, coal, or other substances, preparatory to subsequent treatment or use.

More particularly stated, the invention relates tosifters and self-clearing non-closable screens of the rotary type especially designed and adapted for screening gravel and other detritus taken from a river bed, or any source of supply by agency of suitable dredges or otherwise.

While,therefore, the present invention is adapted for a wide range of usefulness, and for the treatment of various substances and I commodities, the primary object of the present invention is the production of novel and improved mechanism whereby gravel or other metalliferous deposits, recovered from river beds or similar locations, by agency 7 of dredges, may be conducted longitudinally through a rotary cylindrical screen, and properly sifted preparatory to the process of sluicing, or other concentrating processes.

A further object of this invention is to prevent screen clogging by the production of novel and highly efficient means for automatically jarring loose from the interior of the screen detritus under treatment, as also any substances which might become temporarily lodged therein, and, as a consequence, more or less obstruct'the process of screening. a l

A further object is the production of screening apparatus of the character indioated, whichis peculiarly eflicient in opera tion, durable in construction, and not likely to become deranged no matter how heavy the load imposed upon it.

With the foregoing and other objects and I advantages in View, the invention will now be more particularly described, and then pointed out by the following claims.

In the accompanying drawings which form part of this application for Letters Patent, and whereon like numerals refer to.

corresponding parts in the several views Figure -1 is a side elevation of my. invention in position for use including the end of a supply or delivery chute.

F ig: 2 is a transverse sectional view taken on the line 2'2 of Fig. 1, showing the discharge or outlet end of the structure.

Fig. 3 is a .detail fragmentary view taken at the opposite or receiving end of the structure, showing a section of its toothed endring, and one of the screening bars, the latter in side elevation and broken away for economy of space. v

Fig. 4 is also a fragmentary View taken at the discharge end of the structure, corresponding with Fig. 8,6XCGPl) for the fact that it illustrates one'of the relatively movable screening bars.

Fig. 5 is also a detailed fragmentary view in section taken through several alternately fixed and movable screening bars intermetion.

Fig. 7 is a view similar to Fig. 6, but of a-modified form of screen showing a double series of screening bars, and, v

Fig. 8 is a fragmentary detail view showing in side elevation a portion of one of the segmental supporting plates, with suitable openings therein for reception of the ends of screening bars.

Reference being had to the drawings and numerals thereon, -1 indicates suitable foundation piers for supporting the structure, having rotatably mounted therein-flanged guide rollers 2 for supporting the screen proper. As plainly indicated by Fig. 1,the said roller bearings 2 are arrangedin oppositely disposed'pairs, each pair being arranged in different vhorizontal planes in order that the screen'as a whole may be'supported at an angle so as to encourage and necessitate a flow of the materials under treatment from the upper entering to the lower discharge end of the structure.

The structure consists essentially of two end-rings or annuli 3 and 4 connected by tie rods or bolts 5, and a double series of circumferentially arranged relatively fixed and movable screening bars 6 and 7, respectively, interposed between said annuli, as best shown by Fig. 1 of the drawings.

Both the annulus 3 at the upper receiving end of the structure, and the annulus 4 at its lower discharge end are recessed as shown at 8 in Figs. 3 and 4, and within these recesses are positioned segmental plates 9 detachably secured thereto by agency of bolts 10. These plates 9 of suitable thickness and material are punched out as at 11, or otherwise formed, to receive the ends of all bars 6 and 7, the former, 6, fitting closely, and, with relation to its plate, immovably, and the latter fitting loosely so as to permit of slight radial movement as indicated by Fig. 6.

Thelength of these bars 6 and 7 determines the length of the screen, they are preferably of rolled steel having enlarged ends and a relatively fiat connecting web. They may, however, be of any cross sectional area. provided only that the outer edge is of greater cross-sectional area than that of the body or web of the rail.

Surrounding all bars 6 and 7 at points intermediate their ends are endless bands 12 of relatively stiff metal, for the purpose of stiffening the structure to prevent undue flexing or sagging of said bars, and

at intervals these bands 12 are secured in place by set-screws 13 passing therethrough and bearing upon certain of the relatively fixed bars 6, as indicated by Figs. 1 and 5. As a convenient means of slowly rotating the screen about its longitudinal axis, there may be provided at one end of the structure a power shaft 14 drivenby any suitable prime mover or source of power (not shown), and having keyed thereon a beveled spur gear 15, adaptedto mesh with a large driven gear 16, aifixed to the outer face of annulus 3. And obviously a larger or smaller driving gear 15 may readily be substituted for that shown when it may become necessary or desirable to vary the rotary speed of the screen. 7

Referring particularly to Fig. 7 of the drawings representingone modified form of the present invention, it will be observed that the segmental plates 9 are all punched through or otherwise formed with a double series of pockets 11 constituting two concentric series of 7 said pockets, within which are mounted the ends of all bars 6 and 7 being alternately fixed and movable,

and moreover, it will be noted that additional circular serles of screening bars may thus be mounted in'plates such as 9 when desired, for the purpose of insuring a finer gradation ofthe material or materials under treatment. 7

This being a general description of my present invention illustrating one embodi ment thereof, it should be understood that I by no means confine myself to the particular arrangement and combination of parts shown nor to the proportions and materials indicated. On the contrary, the structure may be varied indefinitely in these respects without in the least departing'from the spirit of my invention, and in any event the operation is substantially as follows:

Gravel from any well known form of dredging machine (not shown) is delivered by means of a chute such as A, Fig. 1, into the upper'open end ofthe screen proper through itsannulus 3. This delivery is continuous and serves to constantly charge the screen with a supply of gravel for screening. In the meantime power from any suitable prime mover or source of supply, operating through shaft 14 driving gear 15, and the driven gear 16 serves to rotatev the entire screen about its longitudinal axis, upon its roller bearing supports 2, thoroughly agitating its contents.

The spaces between the upper ends of screening bars 6 and 7 at bottom of screen being determined, permits the escape by "gravity therethrough of gravel of proper size into a suitable sluice box below (not shown), after which it is subjected to the well'known sluicing process, or other means of concentration. In this relation of parts as shown at bottom of Fig. 2, it will be seen that all bars 6 and 7 are concentrically positioned, those numbered 6 being relatively" fixed and immovable in their slotted bearings 11 of the segmental plates 9,'and'those numbered 7 being at their outermost radial positions in their respective elongated slot- -ted bearings 11. As rotation of the screen advances, however, and each of the bars 7 reaches an elevated position oran angle of approximately forty-five degrees the same is dropped forcibly throughout its entire length by gravity, thereby jarring loose and effectually clearing the structure of any obstruction or accumulation of foreign matter which might otherwise'have clogged the screen and .interfered. with its intended functions. i

This operation is repeated indefinitely, each bar 7 of the entire circumferential series automatically dropping by gravity when it reaches the proper elevatedposition, and likewise being returned by gravity to its normal position as it passes down upon the opposite side of the structure, an effectual clearing of the screening bars being thus insured by the jarring or shaking loose action, augmented by the fact that greater clearance spaceisthus obtained between the ends of all bars when so dropped, as clearly shown at theupper portion of Figs. 2, 6 and 7 of the drawings.

Having thus described my invention in one form of embodiment, what I now claim and desire to secure by Letters Patent is:

1. In a rotary screen of the character indicated the combination with suitable end supports provided with radial slots, of .a series of independent screening bars freely mounted in said slots and adapted to gravitate to their lowermost positions as the screen is rotated.

2. In a rotary screen of the character indicated the combination with suitable end supports provided with radial slots, of a circumferential series of spaced apart independent screening bars freely mounted in said slots and adapted to gravitate to their lowermost positions as the screen is rotated.

3. In a rotary screen of the character indicated the combination with suitable end supports provided with radial slots, of a continuous series of alternately fixedand radially movable independent screening bars the latter freely mounted in said slots and adapted to gravitate to their lowermost positions as the screen is rotated.

i. In a rotary screen of the character indicated the combination with annular. end supports provided with radial slots, of a circumferential series of independent screenand a second series of relatively fixed screening bars alternating with the bars aforesaid.

6. In a cylindrical rotary screen of, the character indicated the combination with annular end supports provided with radial slots of a continuous series of independent alternately fixed and movable screening bars the latter freely mounted in said slots to gravitate therein as the screen isrotated,

stifiening bands surrounding all of said bars 7 intermediate the ends thereof, and means for rotating the screen about its longitudinal axis. I

In testimony whereof I ailix my signature in presence of two subscribing witnesses.

V ALONZO G. TURNER. WVitnesses:

E. DYRE, M. D. BALLAUF.

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