US48571A - Improved flour-sifter - Google Patents

Description

`which- UNITED STATES PATENT OFFICE.

HARVEY `LOOKE, OF BOSTON, MASSACHUSETTS.

IMPRovED FLoUR-slF-rEn.

Specication forming part of Letters Patent No. 48,571, dated July 4,1865.

To all whom it may concern:

Be it known that I, HARVEY LOGKE, of Boston, in the county of Suffolk and State of Massachusetts, `have invented a new and useful or Improved Machine for Siftin g Flour, Squashes,

l 811e; and I do hereby declare the same to be fully described in vthe following specification and represented in the accompanying drawings, oi'

Figure l denotes a side elevation, Fig. 2 a top view,and Fig. 3 a transverse and vertical section, of my improved machine, such section being taken through one set of its radial arms.

The nature of my invention consists in so constructingand arranging the wings or curved bars attached to the radial arms that when the driving-sh aft is turned in one direction the said win gs shall simply scrape the concave surface of the sieve and gently force the our or article in such sieve through its meshes, while whenthe shaftlis revolved in the opposite direction the said wings will operate with great power in forcing the article to besifted through the openings of the sieve.

It is a fact well known that inV sifting meal and other powdered articles but very little power is required to eii'ect such object, whilein sifting squashes, pumpkins,turnips, and some other vegetables great forceis requisite to press them through the sieve. 4

To produce a machine which shall combine both these qualities, or be adapted to effect the sifting of both the finer and coarser articles, is the object of my invention.

In the drawings,A denotes a pyramidal box or hopper, (in which the article to be sifted is to be placed,) the same bein g supported upon four legs, B B B B. To the lower end of the said box a curved semi-eylindrical sieve, O, is attached, the same being as shown in Figs. 2 and 3. A drivingshaft, D, formed rectangular in tranverse section, extends longitudinally through the said sieve, and has its journals supported by the leg-frames a a, the said shaft having a crank, E, by which, by power properly applied, it may be putin revolution.

` F F denote two metallic hubs,(arranged upon the shaft D,) from each of which two or any l other suitable number of curved or radial arms,

b b, extend, the same having the form as shown in longitudinal section in Fig. 3.

G Gr are two curved wings, bars, or Scrapers, which are applied to the outer extremities ot' the arms b b b b, the said wings being so constructed and applied to the said arms that while the former may be revolved in one direction the front face of each ot' such win gs shall lightly sweep in contact with the concave su.r. face of the sieve, but while bein g revolved in the opposite direction the forward or front edges oi' the wings will stand at an angle of about fortyve degrees to the lowered ges, whereby spaces Y or chambers will be formed, in which the article to be sifted will be crowded and pressed with great force against and through themeshes of 'the sieve.

It will be evident that four wings or Scrapers might be used instead of two, if desirable.

By giving to the wings the spiralor curved form, as above set forth, the more tenacious matters to be sifted are hetterand more quickly reduced and sifted, and such matters are not so liable to adhere to the wings as if the latter were so constructed and arranged that their paths of revolution were concentric with the curved surface of the sieve.

Amachneconstructedin the above-described improved manner is one of great utility and value for the purpose for which itis intended,

it being not only simple in construction and effective in operation, but little liable to get out of order.

I claim- My improved sifting apparatus, having its wings or serapers G Gr constructed and applied to the arms b b b b and so as to operate with the sieve in the manneras set forth.

HARVEY LOOKE.

Witnesses F. P. HALE, J r., Gr. H. WASHBURNE.

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