US212834A - Improvement in middlings-purifiers - Google Patents

Description

E. S. BARTHOLOMEW.

Mvi'ddlngs-Purifiers. No. 212-,834. Patented Mar. 4,1879.

UNITED STATES` PATENT OEEIGE ESLIS. BARTHOLOMEW, OF MAYSVILLE, ASSIGNOR TO BARRIET T. BARTHOLOMEW, OF AUBURN, NEW YORK.

IMPROVEMENT IN MIDDLINGS-PURIFIERS.

Specification forming part of Letters Patent No. 212,834, dated March 4, 1879; application filed June 27, 1878.

To all whomit may concern:

Be it known that I, ESLI S. BARTI-IOLOMEW, of Maysville, in the county of Chautauqua and State of New York, have invented certain new and useful Improvements in Middlings-Purifiers, of which the following is a specification:

The object of my invention is to provide a simple and effectual machine, arranged within small compass, that will enable me to use the full and effective force ofthe air from the fans to thoroughly winnow the material as it passes through the machine,to facilitate cleaning the screens by means of successive blasts of air, and, furthermore, to feed, convey, and discharge the middlings in an improved manner into, through, and away from the machine, as will hereinafter appear; and the improvement consists, first, in arranging an air-blast port at the head of and above the surface of the screen, and a blast-ch amber beneath the screen, in such manner that the blast up through the screen will raise the lighter particles abovethe material upon the screen, in order that they may be acted upon by the upper blast, which passes in a sheet across the screensurface and carried directly away thereby; second, in combining a screen, an upper draft or blast chamber, a blast-chamber beneath the screen, and an intermittently-operating valve that admits the airin puffs beneath the screen and serves to clear its meshes, and, furthermore, tosses the material above the surface of the screen, which operation materially facilitates the action ofthe upper drafts upon the lighter particles; third, in arranging graded screens one to follow the other at a lower elevation in the same chamber, and providing both screens with separate blast-chambers beneath them, so that the lower screen will catch the tailings of the upper forward screen and be subjected to an independent blast, all these parts being suspended and vibrating together in the same frame, as will hereinafter appear; fourth, in combining the graded screens, arranged one to follow the other, and a suitable distance below its level, the blast-chambers, arranged separately beneath the screens, and separated from each other by a delivery-plate, and provided with spouts beneath the rear end of the screens to deliver the material from ,chamben B, securely attached to its upper members, and at the head of which is arranged a hopper, O, provided with an arrangement for regulating and distributing the feed, as hereinafter described.

The screens D D have blast-chambers E E arranged beneath them, and are secured to a boxing, F, that is suspended by links f f directly beneath the dust-chamber.

A fan-blower, G, and wind-trunk H is arranged at the head of the machine, and is provided with ports I Il, that communicate with the wind-trunks beneath the screens, and

Aalso with a port, I2, that admits the blast into the dust-chamber immediately beneath the feed-hopper and above the head of the screen D, so that as the material falls from the hopper to the head of the screen it is interceptetl by'the blast from the port I2, and freed from a portion of its dust before it falls upon the head of the screen, and thus relieves the screen of unnecessary incumbrance. The port I2 also directs the blast across the surface of the screen, and carries off any impurities that are raised even slightly above the surface of the screen by the blast from beneath it. A valve, J2, is arranged in the port l2, and serves to regulate the force of the blast. This valve may be pla-ced directly over the mouth of thc port, so that its area may'be decreased by closing the valve, and thus project a thinner sheet or sharper blast across the screen when desired. The port I has a valve, J, and the port I1 a valve, J l, to regulate the blast in the chambers E E.

v The valvej is operated by a rod, jl, and bellcrank lever je, with a cam or wiper, jg, secured to the main driving-shaft K, so that at each revolution of the shaft the valve will be opened and closed. A spring, jt, presses upon the crank j, and serves to keep the valve open. By this means an intermittent blast is secured beneath the screen, which will toss the material up and let it fall again upon the screen.

When it is tossed up it is met by the current of air passing over the screen and freed from fiber, and then falls upon the screen, and after a moments lapse of time, during which the granules may pass through the sieve, another puft'ofair from beneath the screen will raise the lighter material again from the screen, and so on until it reaches the tail of the'machine and is discharged. at intervals, a constant draft may pass through the screen to prevent light particles of dust from passing through with the purified middlings, and an intermittent puff or increased lblast may serve to toss the middlin gs up from the screen, as above described. This putting blast will serve to clear the meshes of the screen, so that they will rarely require brush- 1n g.

The screens D Dl are arranged one following the other, and in such manner that the head of the screen Dl adjoins and is a suitable distance below the level of the tail end of the screen D. The blast-chambers E E are sepa-- rated by the delivery-plate e, which is raised on the sides at the discharge end to form a concave or trough that will direct the purified middlings to the spout L, which deposits them lupon the lower delivery-plate, c', ot' the blastchamber E', and whichis of similar construction to the plate e, and is also provided with a spout, L', by which the middlings are nall y discharged from the machine.

By means ot' the graded screens, arranged as described, with separate blast-chambers and a common dust-chamber, a simple construction and economy of space are obtained, giving an increased areaof unobstructed space at the rear end of the machine for the discharge of dust.

The riserD2, arranged between the screens D D, is perforated or slotted, and may be provided with a valve to regulate the opening, and thus serves to admit a sheet or blast of air from the chamber E across the material fallin g from screen D to screen D1, and also across the surface ofthe screen D, in the same manner and for the same purpose described with the port I2.

The boxing F, with its screens, air-chainbers, and spouts, suspended, as above described, from the frame, is vibrated back and forth by means of pitmen -M M, operated by cams mm, secured to a counter-shaft, N, driven from a pulley, K, on the drivin g-shaft K. All of the material, both upon the screens and in the draftehambers, is thus kept in motion and fed along from the head to the tail ends Instead of shutting of entirely of the screens and chambersin a simple and effectual manner.

The vibrating boxing can be easily removed by disconnecting the links f f, so that the screen may be repaired, or other portions of the machinereached, without difficulty. A belt, O, passes from the pulley K of the driving-shaft, and over the pulley N on the counter-shaft and G on the fan-blower shaft, and serves to operate them.

The feed-hopper C is provided with a side flap, C1, hinged at its upper edge and adjusted by means of a set-screw, so that the opening between the lower edge of the iap Cl and the opposite side of the hopper may be increased or diminished.

A scouring-brush, G2, on the shaft K its closely in a concave, C3, within which it revolves, and serves to partly disintegrate and evenly distribute the material upon the cantboard C4; and by means of the valve or hinged flap GI the feed can be readily a-nd nicely adjusted.

l hereby disclaim as my invention the interfering matter contained in the application of William L. Teter now pending before this office.

I claim as my invention and desire to secure by Let-ters Patent- 1. The combination of a shaking screen and a fan having blast-ports above and below the screen, the upper of said ports bein arranged to direct the blast over the surface of the 'screen and operate upon the material lifted by the lower blast, as set forth.

2. The combination of the screen, a blastchamber above the screen, a blast-chamber below the screen, and an. inter1nittently-oper ating valve to close the lower blast, substantially as described.

3. The combination of the graded screens, arranged one below and to follow the other, and provided with separate blast-chambers, all supported and moving in the same frame.

4. The graded screens arranged one to follow the other below its level, the blast-chambers arranged separately beneath the screens, the grani-delivery plate forming the floor of the irst chamber, and provided with a spout beneath t-he rear end of the screen to deliver the material from the tail end of the `upper chamber to the iloor at the head of the lower chamber, substantially as described.

5. The combination and arrangement of the graded screens, one following the other, and a riser connecting them provided with blast openings to permit the blast to sweep the lower screen, as setfforth.

ESLIAS. BARTHOLOMEW.

Vitnesses:

(). .Ll/VILLARD, RINALDO ADAMS.

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