US400621A

US400621A - winkler

Info

Publication number: US400621A
Authority: US
Publication date: 1889-04-02
Anticipated expiration: 1906-04-02

Description

2 R. E K N Tl. W HUH. F...

(No Model.)

SIPTING MAGHINE. No; 400,621.

Patented Apr. 2, .1889.

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2 Sheets-Sheet 2.

(No Model.)

F. Gr. WINKLBR.

SIPTING MACHINE.

Patented Apr. 2. 1889.

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UNITED STATES PATENT OFFICE.

FRIEDRICH GEORG VINKLER, OF ZSCHOPPA, SAX ONY, GERMANY, ASSIGNOR TO ROBERT E. LESTER, OF NENV YORK, N. Y.

su-'TING-MACHINE.

SPECIFICATION' forming part of Letterslatent No. 400,621, dated April 2, 1889. Application filed November 22, 1888. Serial No. 291,597. (No model.)

referred to, first, of a single-wave generator as distinguished from the multiple-wave generators described in another pending rapplication for a patent, whereby the diameter necessary for the rotating structure is diminishedand the size of the machine as a whole is .correspondingly reduced; secondly, of a deflecting-grate composed of a cylindricallyarranged system of bars, the spaces between which bars are approximately diagonal relatively to the radii of the rotating structure,

and the width of which at the outer surface of the grate doesnot exceed their width at the inner surface of the grate; thirdly, of a spiral scraper affixed to the shaft of the rotating Wave-generator and operating to prevent the collection of flolur-dust or other material in the annular spaces between the said shaft and the hollow hubs of the rotating deflecting-grate.

The accompanying drawings of a flour-bolting machine containing the-improvements are a rotating cylindrical sieve, B, mounted upon vided with bearings C5 and C6 at the ends of the machine. Vithin the cylindrical deflecting-grate is a rotating wave-generator, D, which is mounted upon the swift-running 'shaft E, journaled at its opposite ends, respectively, in the bearings e e', and provided with the fast and loose pulleys E and E2 for engaging the belt by which the Wave-generator is rotated. The hollow hub C4 of the rotating deflecting-grate is provided with the driving-pulley O7. The hollow hub b of the sieve is provided with the driving-pulley B2. The portions of the shaft E which are contained within the hollow hubs C3 and C4 are y upon its outer side with a radially-projecting Y strip, i. The space between the outer portions of the slat t' and the radially-proj ecting strip c" may be filled up solid, in which case the outer portion of the slat will have the 'form of the prism i3, (shown in Fig. 3;) or it may'be left unfilled, in which case it will constitute the recess 4. (Shown'in Fig. 3.)

The single-wave generator is composed of two parallel disks, D D', aflixed to acentral shaft, D2, and united to each other by a fan extending longitudinally across the generator from one disk to the other. Like the doublewave generators described in pending application, No. 291,549, filed November 22, 1888, the fans of the single-wave generators may be arranged in a great variety of ways. One of the more simple forms is illustrated in Fig. 2, inwhich, as will be seen, a fan consisting of a partition, d, extending radially inward from the periphery of the generator part way to the shaft, and having its inner edge, d', united to orformed in one piece with a sheet of metal, d2, so curved that its cross-section has a scroll shape, as represented in Fig. 2, and which has its edge d3 united to the outer edge ofthe radial partition d.

IOO

The direction of rotation is indicated by the concentrically-curved arrow (Z5. vAs the fan rotates, the air gathered within the graduallynarrowing space between the deHecting-grate and sieve and the advancing eccentrieallycurved surface d of the fan is ejected in a radially-outward direction, as indicated by the group of radially-arranged outwardly-pointing arrows. The fan may be considered a-s composed of the radial partition d and of the adjoining portion d3 of the curved partition. In front of the advancing fan the air is compressed, and in the rear of the advancing fan a partial vacuum is established. A certain quantity of air is ejected radially from the generator through the detlecting-grate and the portion of the sieve between a line radially opposite the apex of the fan and a parallel line at a distance of, say, forty-five degrees therefrom, more or less. A quantity of air equal to that thus ejected is at the same time admitted through the remaining three-quarters of the sieve and through the deflectinggrate into the generator, as indicated by the inwardly-pointed arrows. It will therefore be seen that the rotation of the fan propagates around the entire sieve a single wave coinposed of vibrations or outward currents of air of high pressure ejected through a comparatively small portion of the sieve and inward currents of low pressure which concurrently flow inward through a relatively large portion of the sieve.

By means of deiectingbars the outward currents are deflected radially toward the sieve witlrsuihcient force to press the linerA particles of material operated upon directly through the meshes, while the. coarser materials which, having been thrown against the interior of the sieve, may have lodged thereon, are dislodged by the inward currents of air, and are caught upon the outer surfaces of the deflecting grate-bars.

The direction of rotation of the deliectinggrate is preferably opposite that of the wavegenerator. The particles which, being thus driven inward, catch upon the grate-bars, are immediately thrown outwardly therefrom toward the sieve and are again thrown inward by the internal pressure of the external air. The inward currents of air therefore prevent the interior surface of the sieve from becoming clogged by progressively clearing from obstructions the part of the sieve which is about to be subjected to the action of the outgoing currents.

The uniform clearance of all portions of the interiorsurface of the sieve is insured by the establishment within the sieve of a continuous air-current in a path concentric with and extending around the greater portion of the interior surface. The establishment of this concentric current is permitted by the use of the single-wave generator, which leaves nearly the whole of the interior of the sieve-cylinder unobstructed. It results that, in addition to the radially-inward pressure of the external air tending to dislodge the bran or coarscr particles fromthe inner surface of the sieve, there exists another important factor in effecting the clearing of the sieve-to wit, the interior concentric air-current, which tends to sweep the bran from the inner surface of the sieve.

It will be perceived that for the successful operation of sifting apparatus of the type herein referred to it is necessary that there shall be continuously supplied to the interior of the wave-generator the quantity of air required to furnish the outgoing current, and, as the inward current is of comparatively low pressure, a relatively considerable area of the sieve must be devoted to the purpose of admitting it; but by the employment of a single wave generator and the resulting larger proportion of the sieve which is thereby left available for admitting the inward current of air of low pressure, the diameter of the rotating structure can be diminished, and the size of the machine as a whole, therefore, be correspondingly reduced.

The single-wave generator can be rotated more rapidly than a double-wave generator of like diameter, and still a sufficient quantity of air be supplied to the interior of the generator to furnish the amount required for the outgoing current. It therefore follows that by the use of a single-wave generator the machine, as a whole, can be reduced in size wit-hout impairing its sifting capacity.

l claiml. The combination, with a cylindrical sieve, of a single rotating wave-generator for continuously propagating a single wave of air around the entire circumference of said cylindrical sieve, the said generator consisting, essentially, of two parallel disks affixed to a central shaft and of a fan extending inwardly from one side of the periphery of the generator, and extending longitudinally across the generator from one of said disks to the other.

2. In combination with a cylindrical sieve and means for establishing outward and inward currents of air through said sieve, a hollow cylindrical detlecting-grate composed of a system of slats inclined diagonally with relation to the radial lines, which centrally intersect them, respectively, and shaped in cross section, substantially as described, whereby the widths of the outer ends of the spaces between the slats are prevented from exceeding-the widths of the inner ends of the said spaces.

3. The combination, as herein set forth, of the hollow hubs C3 and C4, of the cylindrical defiecting-grate and the spiral blades e2 and c3, affixed to the portion of the fan-shaft E IOO IIO

which is surrounded by the said hubs, re-

spectively.

FRIEDRICH GEORG WINKLER.

\Vitnesses:

J. I-I. WHITELEGGE, A. M. JONES.