US17995A

US17995A - Winnowing-mill

Info

Publication number: US17995A
Authority: US
Publication date: 1857-08-11
Anticipated expiration: 1874-08-11

Description

l STAES OFFICE.

MANASSEH GROVER, OF CLYDE, OHIO, ASSIGNOR TO HIMSELF, AND I-I. H. SEELY, OF

HUDSON, MICHIGAN.

WINNOWING-MILL.

Specification of Letters Patent No. 17,995, datedAugust 11, 185'?.

To all whom t may concern Be it known that I, MANAssEH GRovER, of Clyde, Sandusky county, Ohio, have invented a certain new and useful Improvement in Winnowing-Machines; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the annexed drawings of the same, making part of this specification, and in which- Figure l represents a vertical section of a winnowing machine embracingV my improvement, and Fig. 2, a top view of the same.

In both these views the hopper is removed.

In all grain cleaning machines which I have seen one defect was most prominent, viz, the failure of the fan to impart to the screens and grain, not more than about onehalf of the air created by it; for, it is well known that not much more than. that proportion is forced by the fan out of the case, but kept within it and carried around and around with the fan-blades. An attempt has been made to obviate this defect by placing the blades of the fan obliquely in such manner as to tend constantly to force the air fromA the center; but I have found that even this arrangement does not force i j r out the air it creates (for the lack of compression). Knowing therefore, that the full volume of the blast of the fan would greatly facilitate the cleaning of the grain, I endeavored to obtain it, and by actual experiment I found that by simply arranging in the throat or opening (a) of the fan case (b) a series of air troughs or scoops (c) which extend from the case (b), that they would catch the air from the blades so as to cause it to pass freely from the case, and thus prevent a large portion (as in other machines) from passing back and following the rotary motion of the fan, which it certainly would do if these troughs were not thus arranged, or if they were Hat boa-rds, as in the other machines. And to act in connection with the scoops (c) in effecting this desirable result, I have constructed the blades (d) of the fan, so that the plane of` v screens.

,philosophy of it is that the fan-blades in their rotary motion throw the air off from the center nearly downward at the air passage of the fan case, and strike the scoops or troughs nearly in a downward direction (therefore the philosophy of the scoopshaped boards is quite obvious) and down very near to the scoops or troughs before the air becomes compressed sufficient to produce an air current having its required velocity; and, to accomplish this compression mostl effectually the air must have two directions, outward and inward; the outward motion is toA place the air where it can be thrown upon the scoops or troughs for compression by the obtuse angle (e) of the fan blades. The mere outward direction from the fan case throws the current of air againsttoo large a volume of air to produce an air current having the required velocity; consequently this shape or arrangement of the fan blades is exceedingly obvious and indispensable, and does not require the scoop boards to stand as far apart as it would be supposed.

The bottoms of the scoops at their open side are made flat and extend a short distance from the fan case, for the purpose of directing the air upon the screens of the shoe. It will therefore be seen that it is not the purpose of these troughs to divide the air into more currents, but only to act in conjunction with the obtuse angle of the fan blades to increase the blast or to obtain the benefit of the full volume and force, which is created by the surface of each fan blade, by which the cleaning of the rain will not only be facilitated, but the labor of turning the machine is also much reduced, inasmuch as the fan does not require to be turned near as rapidly as with those in general use.

The obtuse angles (e) of the blades (d) are formed near the outer edges thereof by making a portion (about 'one-fifth) of the oblique blade radiate from the shaft upon which their arms (g) are mounted, and the oblique part (d) forms a tangent to a circle about half the diameter of the case, (b) and the tendency of the part (d) is to force the air from the center. Yet, on trying it Without the obtuse angle (e) I found that it did not give out as inueh blast or with as much force as it did when operating with the angular form seen in the drawings. f

I/Vhat I claim as my invention and desire to secure by Letters Patent, is-

Arranging in the throat or opening of the fan case a series of troughs or scoops (c) in combination with the obtuse angles 10 (e) of the fan blades, in the manner and for the purpose herein fully described.

In testimony whereof, I have hereunto set my. hand and seal.

MANASSEH GROVER. [11. s] Attest:

WILLIAM GRISHAM, JOI-1N S. HOLLINGSHEAD.