US985809A - Gravel or ore screen. - Google Patents

Description

F. J. HOYT.

GBAVEL 0R -ORB SCREEN. APPLICATION FILED JULY 7, 190s.`

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l fr@ ven/Zar F. J. HOYT. GRAVEL 0R ORE SCREEN. APPLICATION FILED JULY 7, 1908.

Patented Mar. 7, 1911.V

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F. J. HOYT.

GRAVEL 0B. ORE SCREEN. APPLICATION FILED JULY 7, 1903A 985,809. Patented Mar. 7, 1911.

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FREDERICK J'. HOYT, OF' REDLANDS, CALIFORNIA.

GRAVEL OR ORE SCREEN.

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To uli' 'whom it may concern:

Be it known that l, Fminnmox J. lilorr, of the city of Redlands, in the county of San Bernardino and State of California, have invented Improvements in Gravel or Ore Screens, of which the following is a full, clear, and exact specification, reference being had to the annexed drawings and to the letters and ligures marked thereon.

My invention pertains to the construction of gravel or ore screens, in which the gravel or ore is separated in the order of their sizes, and it provides a frame having thereon horizontallydisposed, transverselymovable endless screens which are carried by rollers, and the rollers have grooves to receive sprocket chains to carry the screens, so that the screens may be kept taut by suitable means, as will now be set forth in detail.

ln the annexed drawing, Figure 1 is a side elevation of my improved gravel or ore screen, showing three screens in operative relationship. Fig'. 2, is an end elevation corresponding to Fig 1, looked at in the direction of the arrow X, Fig. 1. Fig. 3, is a plan corresponding to Figs. 1, and 2, and hereinafter described.

Upon the annexed drawings the parts marked 1, constitute the framing wherein the screens and the driving` gear for operating the rollers and sprocket chains and traveling screens are carried. In the lower part of this framing and carried in bearings 2, is the shaft 3. The shaft 3, is driven by a belt acting upon the driving pulley 4. Upon the shaft 3, there are carried three belt driving pulleys 5, 6, and 7, respectively, all of the same diameter, and these driving pulleys actuate the driving belts 8, 9, and 10, whose upper ends pass over corresponding pulleys upon the screen driving shafts 11, 12, and 13. Upon the driving shafts 11, 12, and 13, as shown at Figs. 2, and 3, but more especially at Fig. 2, and as near the ends of the shafts 11, 12, and 13, as may be conveniently arranged within the framing 1, is a driving sprocket wheel 14, upon each of said shafts. These driving sprocket wheels 14, engage with the driving sprocket chains 15, more especially shown in Fig. 8, and positive motion is thereby transmitted from each of the sprocket wheels 14, to the tension rollers 16, and grooved idler carrying wheels 17, by the continuous motion of the Specification of Letters latent.

Application filed July l', 1908.

Fatented Mar. '7, 1911.

serial no. 442,615.

sprocket chains in operating in the grooves or channels in each of the tension rollers and in each of the idler carrying rollers.

The sluiee 1S, is that from which the mixed gravel and sand, or mixed gravel or ore with water, flows on to the flat upper part of the first screen 19, and as this flat part of the upper screen 19, travels in the direction indicated by the arrows in Figs. 2, and 3, it necessarily follows that while permitting of the liner material and .water dripping through the meshes of the upper flat part of the screen 19, that the coarser portions of the gravel or ore which cannot pass through the meshes of the screen 19, are delivered over the end of the screen as it passes around the sprocket wheels 14. This coarser or firstseparated gravel or ore. then falls, as shown at Fig. 2, on to the chute 20, and thence is discharged on to the traveling belt 21, by which it is deposited into receptaeles, railway cars, or other vehicles, all of the same grade or size.

rlhe water and the portions of the gravel or ore which pass through the meshes of the screen 19, fall downward as indicated in Fig. 2, upon the second screen 32, which also is moved by its sprocket wheel 14, operated from the driving shaft. 3, as hereinbefore described, and discharges the next coarsest graded portions of the gravel or ore over the screen at the end where the driving sprocket wheel 14, and shaft 12, are situated, and these graded portions of the gravel or ore fall over that part of the screenat this end of the machine into the chute 23, from which they are discharged on to the traveling belt 24, and deposited wherever required as hereinbefore described with reference to the traveling beltl 21. Such further portions of gravel or ore mixed with water which are small enough to pass through the meshes of the screen 22, are deposited upon the top flat portion of the screen 25, and are discharged over the end of the screen where it is driven by the three driving sprocket wheels 14, and is discharged into the chute 26, thence on to the traveling belt 27, from which it. is discharged as hereinbefore described.

1t is here explained that while in the previous part of this specification, consisting of the description of some parts of the drawings, the driving sprocket wheels-14, upon the shafts 11, 12, and 13, are referred to as that hy which motion is positively transferred from the belt pulleys to the several screens, yet there are rollers or cylinders, and other grooved wheels and sprocket chains between the driving' end of the several shafts 11, 12, and 13, and the opposite end of said shafts, where carried in the bearings attached to the framing 1. These other grooved wheels 17, are shown in dotted lines within the screen 19, in the upper part ot Fig. 1, rEhey are also particularly shown in plan in Fig. while in the second screening mechanism next below the screen 19, in Fig. 1, these greoved wheels 17, together with the shafts which they are carried on7 are shown in elevation, being also shown in elevation as part ot' the mechanism of the third screen in Fig. 1.

Between the driving sprocket wheel 11i, of each series of sprocket and grooved wheels 30, there are carried cylindrical rollers 31, 32, and 33, shown in elevation in Fig. 1, with the screen removed in respect of the second and third members of the series, and in plan in Fig. 3. rl'he object of these intermediate rollers 31, 32, and 33, is to provide sullicient transverse traveling bearing surface across the width ot' the screens, each otl which is placed in the condition of tension bv tightening the tension gear 311, of each 'oit' the tension rollers carried upon the shafts 35, 36, and 37, the tightening produced hy which draws each screen taut over the corresponding cylinders 31, 32, and 33, carried upon each of the shafts 11, 12, 13, 35, 36, and 37, as well as upon the outer end shafts 17a of each series.

Any convenient means may be used for tightening the tension of the sha- tts 35, 36, and 37, and the grooved wheels carried thereon, but have shown upon the annexed drawings a bracket piece 38, in the upper part of each of which is a bearing for one end of the shafts 35, 36, and 37, of the tension rollers. A

The water and ne sand admiXed therewith, after passing through the last and lowest screen of a series of screens, is discharged by the chute 39, into the bin 40, and deposited therein.

It will be understood from the preceding description of the mechanism constituting my present invention, that the several sprocket chains in addition to the driving sprocket chain for each screen, as well as the grooved idlers 17, upon the tension shafts 35, 3G, and 37, are provided for the purpose of maintaining each screen fiat, that is to say, without bellying, and that for the purpose of more eilectually insuring this, the screen is fastened by soldering or by an equivalent fastening at one or more parts of its length, to each of the sprocket chains. The particular mode of fastening the screens to the sprocket chains does not, however, constitute any part ot' my present invention.

l claim as my invention.

A. gravel or ore screen, comprising a frame having therein horizontally-disposed, transversely-inovable endless screen, cylinders or rollers at each end to carry said screen, said rollers having` grooves at intervals and sprocket chains in said grooves extending from roller to roller, the screens being secured to said chains at intervals, and means for producing tension on said chains and keeping' said screen taut.

ln testimony whereof, I have hereunto set my hand and seal at the city of Los Angeles, in the presence of two subscribing witnesses.

FREDERICK J. HOYT. [L s] 1V itnesses ST. JOHN DAY,

J. D. Gear.

Copies of this patent :nay be obtained, for five cents each, by addressing the Commissioner of latents, Washington, D. C.

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