USRE6029E - Improvement in machines for bolting flour - Google Patents

Description

SHeets--Sheetl W. F. CH RAN E.

Maqhines for Bulting Flour..

N0'. 6,029., Reissued Aug. 25,1874.

Iq- |1 l fl N V h 1 N @BS 5 h l @w l g l"l e N N M V i do hereby declare that the following is a full,

UNITED STATES PATENT OFFICE..I

'ILIJIAM F. COCllR-ANE, OF LA FAYETTE, IND., ASSIGNOR, BY MESNE ASSIGN- V MENTS, TO IIIMSELF, BENJAMIN II. WARDER, AND RODNE'Y MASON.v

IMPROVEMENT IN MACHINES FOR BCLTING I'j'LOUR.

Specificationvforming part of Letters Patent No. 37,321,`dated January 6, 1863;'r'eissue No. 6,029, dated August Q5, 1874; application filed August 12, 1874.5r

To all whom it may concern Be it known that I, WILLIAM F. COCH- RANE, of La Fayette, in the county of rlippecanoe and State of Indiana, late of Springiield, in the county of Clarke and Statcbf, Ollio, 'have invented new andusefnl Improvements in Machines for Bolting Flour; and I clear, and exact description ot' the same, reference being,- had to the annexed drawing, making part of this specification, in which- Figure 1 is a perspective view with the panels removed to show the interior struct,- ure, and Fig. .5 is a vertical longitudinal section.

In manufacturing flour heretofore screens or bolts have been employed, consisting of a frame covered with a rccticnlated cloth of wire or threads ot' silk, the latter being cov ered with a gum for the purpose of making the thread firm, and thus maintaining the uniformity ofthe interstices; but, as the heat and vapor evolved in the operation of grindin g the grain into meal tends to softenthis gum, it has been a frequent source of embarrassment to the miller that his cloths become clouded7 by the adhesion of tine particles of the meal, so that resort has been had to brushes and currents of atmapheric air for the purpose of keeping` thc meshes clear.

In the use ot' atmospheric bolts it is obviousthat, it' the air is allowed to escape freely, there will be much ot' the finer portion of the meal carried away by the blast and wasted, and this loss has heretofore prevented the general use ot' such bolts, notwithstanding the obvious advantages attending such a use of the air.

To avoid this difficulty is the main purpose of my invention, as illustrated in this case, and -in other patents 4of even date herewith, founded upon applications simultaneously filed. l

To this .end the invention embraced in this patent consists, irst, iu combining with the bolt` and blast-pipes, and mechanism for allowing the meal to pass Without the air passing therewith at the same time, a collectingchamber placed in the air-educton passages for causing the deposition of the light parti- -eape of the blast through' the valve. Y

cles carried with the current before the final escape of thc air. 1n this case the eductionpipe opens out of the collecting chamber, so that the air, before heilig returned, may be purified by deposition of the heavier particles, which may be returned to the bolting-chest or carried away, according to circumstances, at

element in a combination in another vpatent,

ot' even date, but merely for a deposit-chai ber in which the separation is-made by gravity.

To carry out the objects of my invention in the most perfect manner, I have found it neccssary to remodel almost entirely the bolting-chests heretofore-used. I construct the frame of the bolting-chest of stout timbers,

united by lnortises and tenons, and -held together by screws or bolts in such manner as toadmit L.of their being readily taken apart or put together again. Above the chest I construct a chamber extending the whole length of the frame. This chamber is divided into numerous cellsor compartments by means of transverse partitions, having alternately open spaces at top and bottom. 1

As the air escapes from the reel it enters this chamber and passes througheach of the,

cells, being alternately deflected upward and .downward by the partitions, iu order that the tine flour carried otf from the reel-chamber by the blast may be deposited. A pump or valve iu the bottom of the chamber discharges the line iour thus deposited either directly A into a trough or into the reel-chamber,-with out rin either case permitting the return or es In the accompanying drawings, which represent a convenient arrangement of parts for carrying out the objects of my invention, my improvements are shown as appliedto a bolting-chest consisting of two reels arranged side by side.

As the construction is the same in both, a"

E3 in this instance are open at one end only,

these open ends being inserted into the bellmouth E. The bolting-cloths are secured to ribs E, inserted into slots in the reel-armsE.

Air is supplied to the reel in the following manner: The end of the reel-shaft nearest the driving-gear is hollow, and forms a close joint with the end of an air-tube, Q, leading from a fan, G; the shaft revolves freely, but the airtube isl stationary. The reel -chamber is divided into two compartments, of unequal size,

by a partition, QE", which encircles the reel, and fits snuglyein a anged wing, e, upon it. The larger of these two compartments is for the reception of the fine flour, which passes through the bolting-cloths, while the smaller one forms a dead-air chamber, E9, into which. the tailings or oiial falls, a portion of the tail end of the reel being left open for that puriose. 1 The collecting-chamber H is divided into a number of compartments or cells by means of the transverse partitions h h'. The partitions h tit closely to the top of the chest, but do not extend quite to Vthe bottom of the chamber, while the others, h', are secured to the bottom, but do not reach the top, their lower edges being inserted into grooves in the valveshaft I. The current of air passes from the bolting-chamber through an opening behind the spout C, which feeds ythe reel and enters the collecting chamber, through which it passes. being alternately deiiected upward and downward by the partitions h h', thus forming eddies, which cause the flour or dust to settle inthe cells upon the valve-shaft I, by which it is discharged. 1 l

Tile valve I, in this instance, consists of 'a rotating shaft, fitting accurately and turning freely in two concave blocks, whose inner sides are curved to suit it. The shaft I has a long slot cut entirely through it, into which a board, il, fits. The width of this board is somewhat less than the diameter of the shaft, and it its closely in the slot, but is free to reciprocate transversely in it.

`Shallow annular channels or groovesi2 are'cut into the shaft at intervals. Brackets a, curved on their under sides,

near their centers, to. correspond with the grooves t7, are secured upon the base-boards or concave blocks, and serve to hold the shaft 'and blocks together, and as a guide or cam to work the reciprocating board or plunger fi. The arrangement of the brackets is such that, when the plunger-board t" is vertical, a cavity or channel, in which the ne iiour is deposited,

Ais left in the upper side of the shaft; but when the shaft revolves the board is pressed down, leaving a similar channel on the upper side, now uppermost, andv forcing out the fine flour into a trough or eonveyer below, through an opening between the concave-blocks. In the present instance, however, for convenience of construct-ion, the fine flour thus collected is dropped by the valve directly into the reelchamber, where it mingles with the other flour.

After passing the whole length of the collecting-chamber the current of blast air may enter the air-trunk J, which leads to the fan G, and again be returned to the reel, or it may be permitted to escape at once to the.'l

open air. l

The meal is supplied to the screen by means of a plunger, (sho-wn at X, Fig. 2,) which takes it from the mouth of the supply-pipe and passes it into the bolting-chest against the pressure of the air by a positive feed. As the feed-pipe above the pump is vertical it will be filled with meal, which will prevent Y the escape of the air, while the reciprocating action of the plunger will cause the meal to be fed into the bolting-cloth without permittingthe air to passat the same time.

It is unnecessary herein more specically to describe the construction of the-pump, as that is fully shown `in and covered by Patent (No.37,319, another division of the original application,) and it forms `no part in itself of the present case.

Another feed-valve is illustrated by the roller I, which is used to feed the ne parl ticles from the collecting-chamber into the chest or into the trough, whence it isI conveyed away air. The meal is'delivered out of the chest by a shaft-valve, Y, in all respects like the valve I, herein fully described, and need not be more particularly referred to, as it is fully shownand broadly covered by Patent No.

37,320, (another division of said original applicatiom) and it forms in itself no part of the present case. Its construction must be such as to permit the escape of the our by a positive discharge without allowing theair to pass at the same time. t

It is'deemedunnecessary to describe in de'- tail the construction and operation of the other parts of the mechanism, as they form no part of the subject-matter herein claimed, and are, moreover, fully described in other applications liled simultaneously with this, and marked, respectively, A, B, G, and D.

What I claim as my invention, and desire to secure by Letters'Patent, is-

without permitting the escape of the 1. In combination with the bolt and air-pipes mid valves for feeding and delivering without allowing the air to pass therewith, the collectingehmnber for simultaneously feeding, scpzu'ztting, and delivering the flour, While the light particles carried with the current are deposited, and the blast continuously maintained, substantially as set forth.

2. In combination with the screen and blast and suction pipes, the collecting or deposit chamber, wherein dead-air spaces are formed for the deposition of the specifically heavier particles carried up, by the atmosphcrieonr-- rents by gravity, lsubstantially as sct forth.

In testimony that I claim the foregoing I have hereunto set my hand this 12th da-y of August, 1874.

WM. oooHRANE.

Witnesses R. MASON, D. P. IIoLLoWAY.

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