US1213322A - Portable coal-screening rig. - Google Patents

Description

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Ira/@2211072 C. S. WILLIAMSON. PORTABLE coAL SCREENING me. APPLlcmou FILED Nov. a. 19,11.

Patented Jan. 23,1917.

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- C. S. WILLIAMSON.

PORTABLE coAL SCREENING RIG.

AP*PLICATION FILED -NOV. 3. ISI l.

Patented Jan. 23,1917.

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CHARLES s. WILLIAMSON, or CHICAGO, ILLINOIS.

PORTABLE COAL-SCREENING RIG.

Application filed November 3, 1911.

To all whom t may concern:

Be it known that l, CHARLES S. 1WILLIAM- soN, a citizen of the United States, residing at Chicago, county of Cook, and State of illinois, have invented new and useful Improvements in Portable 'Coal-Screening Rigs, of which the following is a specication. v

It is the object of the present invention to provide a screening plant whereby run of pile7 coal, as it is unloaded from a ship at a dock, may be screened and sorted into a plurality of sizes and delivered direct to cars with a minimum of handling and deterioration; to provide a screening plant adapted for loading a. plurality of cars simultaneously with different grades of coal, all properly screened, this plant being movable along the dock front so that it may be placed in convenient working position at the side of a boat and under the traveling bridge and grab bucket whereby the boat is being unloaded; to provide a special arrangement of hoppers, screens and conveyers whereby run of pile coal delivered to the main receiving hopper of the plant may be distributed, screened and ultimately delivered to loading hoppers, from which delivery to the cars may be made through car loaders of standard construction; to provide chutes and other adjuncts for taking care of the slack coal and delivering it to the dock, or in other ways suitably disposing of it; and to provide electrically operated motive devices whereby the plant may be moved along its track at the water front and whereby the conveyers and other movable elements of the plant may be economically driven.

The objects above enumerated and others of a similar nature are accomplished by the embodiment disclosed in the accompanying drawings and hereinafter described in detail.

Figure 1 is a side elevational view of the screening device of my invention. Fig. Q is an elevation on the line 2 2 of Fig. 1, showing one of the assorting coal bins with its loading spout in operation. Fig. 3 is an end elevation of the loading apparatus shown in Fig. l, and Fig. 4l shows the structure from the other end.

In the construction shown, the entire plant or rig is mounted on wheels and is movable over rails 1 and 2 which may be laid along the water front of a dock, between the Specification of Letters Patent.

Patented Jan. 23, 1917.

Serial No. 658,301.

slip and the front leg of the unloading bridge. `This trackage may have a gage of twelve (12) feet. Between this trackage and water front is a railway of standard gage, on which box cars 3 and 4 may be pushed in at the side of the screening plant for receiving their loads of Coal simultaneously withthe unloading of the coal from the boat subject matter of the present specication isV well adapted for use on a water front and in conjunction with a traveling unloading bridge, it may be used in other relations, as will be readily apparent to those skilled in the art.

The screening plant is mounted on sixteen (16 track wheels 5, located four at each corner 1n compensating tandem trucks. These wheels are compensated by pin connec-v tions 6 to the main posts of the structure. A motor 7 may be mounted on one of the trucks and connected to drive the supporting wheels with a speed of travel appropriate for shifting the plant along itstrackage as the unloading of the boat progresses. The framework of the plant is of structural steel, including four corner members 8 stifened by diagonal bracing members 9, 10 and 11 and stiifened laterally by cross-braces 12 and 12 (Fig.

Run of pile coal is delivered from a grab bucket, or other suitable source, toa fiftyton hopper 38 located at the top of the plant. This hopper is preferably built of steel, suitably stiffened and braced by structural shapes, and has a top opening wide enough to enable the operator to discharge the bucket without spillage and without undue loss of time. At the base of the hopper is a feeder mechanism (not shown) which delivers the coal to a bar screen 13, having various sizes of bar spacing. The feeder mechanism just mentioned may be a measuring feeder of the plunger type or other approved design well known in the art, and is mounted beneath the hopper 38 for the purpose of delivering the coal to the screen 13 .at as nearly a uniform rate as is practicable.

The speed of feed of the coal is made variable so as to provide for different conditions of loading. The feeder may be driven by a small motor housed in the cab 39k at the base of the hopper, said motor heilig also used for other purposes as hereinafter set forth.

The lump coal delivered to screen 13 passes off the end of the screen into a spiral spout 14, from which it enters a box-car loader 15 and is thereby distributed in the car in the well known manner.

Beneath the screen 13 there is suspended a 25-ton hopper 16 for receiving the simili coal which has passed through the screen bars. This small coal hopper 16 inrturn delivers its coal to a flieht conve 7er` which carries it to an elevator, as hereinafter set forth.

The bar screen 13 is made up in two sections, the upper section being approximately twice as long as the lower section and `with the bars spaced three-quarters of an inch apart.

The exact spacing of the screens is optional with the user and, as a material for forming the screens, either bars, wire mesh or perforated lplates may be used.

The flight conveyer 17, indicated by the. dotted line Fig. l, is arranged over the bar screen 13 to provide. for a continuous flow of the coal over the screen atas nearly a uniform speed as is consistent with this class of service. The conveyer is made up of two strandsY of steel-roller chain, carrying steel flights or cross-bars approximating six feet in length. The chain travels on rollers in suitable side guides so as to be out of the path of the coal, in accordance with common practice. This flight conveyer preferably runs at approximately four hundred feet per minute and has flights of suflicient height to retard the rush of coal when the coal reaches the lower portion of the screens. The conveyer is carried upward at 1S toward the` end of the screens to permit the lumps to pass out from beneath its strands or side chains. The conveyor then returns underneath the hopper 16 and there serves as a carrying conveyer for the fine coal which has passed through the screen 153 into the hopper 16. This hopper 16 has its bottom fitted with two gates 19 and 20 of sufficient width to providefor the uniform loading of the flight conveyer while it passes beneath. lf this hopper has a capacity of twenty-five tons, it will enable the conveyer to continue. carrying screenings to the elevator `21 at the other end of the plant, even after the boxcar loader 15 has ceased to deliver lump coal to the cars, thereby maintainingT a balance between the screen and the elevator', which will prevent thcelevator from being worn out by running empty during the periods of shifting earsat the loading spout.

The elevator 21, at the extreme end of the enough to admit of a gravity feed from the adjacentend of the flight conveyer.

Coal carried up by elevator 21 is delivered through a hopper 25 to two revolving screens 2G and Q7 of approximately five foot diameter and eighteen feet in length. These revolving screens are each covered with woven wire mesh screening, the upper screen having` a three-quarter inch square mesh and the' lower screen a one and onequarter inch square mesh.. This provides for making three sizes of coal, namely: egg coal over the end of the screen, nut coal through the one and one-quarter inch mesh and slack through the three-quarter inch mesh.

Two bins 28 and :29 are provided beneath the revolving screens for receiving the egg and nut coal as prepared by those screens. Each of these bins may have a capacity of approximately forty tons and they are equipped respectively at their bottoms withV cut-off gates 30 and 31, both of which deliver to a common loading spout 32. This loading spout has a perforated plate screen 33 of about sixteen square foot area, which takes out of the nut and egg coal such deterioration as is made in delivering from the revolving screens to the bins. After the coal passes screen 33 it may be delivered to a Ticknor-Manier box-car loader mounted in the screening plant at an approximate distance of fifty feet from the lump coal loading spout. This will permit a car of egg or nut coal to be loaded simultaneously with the lump coal. The Ticknor-Manier box-car loader may be of standard construction and size and need nothere be described.

Simultaneously with the separation of the los egg yand nut coal at the revolving screens,V

the slack coal iS delivered through screen 26 to a hopper 34 and from there passes to a. spout 35 which returns the slack to the dock, from which point it can be loaded into -open-top cars directly, or can be again lifted up and loaded through the run of mine hopper 12 with veil plates placed over the screens to allow the slack to pass into the box-car loader 15.

The elevator and revolving screens may be driven in any desired manner, but preferably are driven by an electric motor housed in a cab 35@ and connected with the elevator and with the screens through suitable reduction gearing and friction clutches. The drive for the flight conveyer 17 can advantageously be made from a motor sheltered by house 89 and also used to drive the plunger feeder at the base of hopper 38.

Stairways and platforms may be pro? vided to afford easy access to the variousV parts of the plant, as shown in Fig. l.

The box-car loader may be of the Christy type and is mounted on wheels 36 arranged to operate on the twelve foot track of the plant. Electric current for propelling and operating this loader is taken through collectors arranged to make contact with the electrical distributing system on the dock. The electrical distributing system on the dock is of the protected rail type, comprising a row of posts 37 placed at the side of the track of the plant. The feeder system con- 1 sists of one positive and one negative line on the near side of the posts and in position for delivering electrical energy, not only to the box-car loader, but also to the screening plant as a whole.

Although the above description describes in considerable detail the exact arrangement or grouping of the several elements and their relative sizes or capacities, it will be understood that changes may be made in these various features without departing from the spirit of the present invention as defined by the appended claim.

That I claim as new and desire to secure by Letters Patent of the United States is:

In a. portable screening plant, the combination with a receiving hopper, a screen for receiving coal from the said hopper, a spout leading from the lower end of said screen, a hopper for receiving coal which has passed through the screen, an endless conveyer for regulating the movement of the coal over the screen and the conveyer when passing over the lower end of the screen being supported above the same and spaced therefrom Jfor the purpose specified.

In witness whereof, I hereunto subscribe my name to this specification in the presence of two witnesses.

CHARLES s. WILLIAMSON.

wWitnesses:

MYRTLE B. KINNUGAN, (li-IAS. C. BROOKS.

Copies of this patent may ne obtained for ve cents each, by addressing the Commissioner of Patents,

` Washington, D. C.

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