US434246A - Grain-separating screen - Google Patents

Description

4UNITED STATES PATENT OFFICE.

CHARLES CLOSZ, OF STJANSGAR, IOVA.

GRAIN-SEPARATING SCREEN.

SPECIFICATIONAforming part of Letters Patent No. 434,246, dated August 12, 1890. 4

Application filed May 8, 1890. Serial No. 35I.049. (No model.) Y

To 'all whom it may concern:

Be it known that I, CHARLES OLosz, a citizen of the United States, residing at St. Ansgar, in the county of Mitchell and State of Iowa, have invented new and useful Improvements in Grain-Separating Screens, of which the following is a specification.

My improvement is directed to a novel construction ofthe corrugated sheet-metal chaffing screen or riddle for grain-separators, and particularly for eecting a preliminary separation of straw, sticks, weeds, husks, bits of cob, silk, and nails from the grain. My improvement embraces a construction of such sheet-metal separator wherein ridges are inclined upward between approximately heartshaped openings and terminate in spearpoints at the rear edge of each opening to form shallow side inclines between and terminating in the lowest front edges of the said ridges and spear-points in an outward end discharge under the longitudinal]y-reciproeating movement of the platform. The termination of the inclined ridges in spear-points is to give enlarged rounded ends to the openings on each side of the spear-points; to allow for the free passage of air-currents; to more efectually assist in raising the straw as it rides over the inclined ridges, and to cause the grain to pass to the enlarged ends of the openings along the shallow side slopes formed by said ridges.

The accompanying drawings illustrate this construction, and the claims concluding this specification will particularly point out the improvements.

Referring to the drawings, Figure l is a vertical longitudinal section of my improved shaking-screen for separating grain, taken through the inclined ridges of the spearpoints. Fig. 2 is a vertical cross-section of the same, taken through the openings; and Fig. 3 is a top view of the same.

In the drawings, I have only shown the shaking platform-separator, as its illustration in connection with a supply-hopper and other suitable separating appliances is deemed unnecessary to a proper understanding of the improvement and its use in such machines. It will be understood, however, that the grain to be separated is delivered from a suitable hopper or conveyer upon the inner end A of the corrugated platform, and that the latter is connected to a suitable devicel for giving it a longitudinally-reciprocating movement, and for this purpose it may be suspended from fixed parts of the frame or supported upon fixed ways of the frame, and that it is set with a downward inclination toward the discharge end for the passage of the straw and long stuff; or it may be used in a horizontal position.

The separator-platform is of sheet metal and is formed with longitudinal corrugations a, which extend in parallel relation the length of the platform and at such height and distance apart as to form channels, within which approximately heart shaped openings are made so as to stand crosswise therein and to extend from the base of one corrugation to the ba'se of the other. These approximately heart-shaped openings are preferably formed with their forward edges nearly straight and their inner edges rounded into enlarged ends b. Between each of these heart-shaped openings and centrally and longitudinally between the cor-rugations, the channels are formed with ridges c, which are inclined upward toward the discharge end of the platform and terminate in spear-points d at the inner edges of the openings, so as'to form shallow inclines c on each side of the ridges, which slope downward and inward from the spear-points at the highest'curved edge of one opening to the lowest forward straight edge of the next opening. This construction gives two inward slopingsurfaces e between the central ridges and the corrugations and enlarged endsto the openings on each side of the spear-points, which serve to facilitate the separation and discharge of the grain from the straw and other foreign stu which is too long and too large to pass through the openings. The forward straight edges of the openings are beveled downward, and the openings are not only left fully uncovered but are enlarged at each end'. In this separating ac tion the central ridges c serve to separate the mass as it is moved longitudinally over the openings and to cause the grain to slide down IOO into the two enlarged ends of the openings in either direction. For some distance the receiving end of the corrugated platform is made without the openings and the central ridges c are not inclined but stand at aheight on a level with the spear-points for the purpose of causing long stuff in the mass to turn lengthwise before it reaches the first openings, and thereby place such stuff in position to move along over the central ridges the sloping sides and the openings. This platform may be used with any form and arrangement of under-shaking screens and with or without a fan-blast; and I prefer to form it of a single sheet of metal and to secure it to a frame or side bars.

The inclined ridges c serve to give increased stiffness to the platform, and are made by comparatively shallow corrugations, which are about half the height of the unbroken corrugations. sheet-metal separating-surface of unbroken parallel longitudinal corrugations, intermediate interrupted inclined ridges terminating in spear-points, slopes on each side of said ridges, and openings crossing said ridges and extending on each side of the said spearpoints.

It will be seen that the spear-points give the rounded ends to the openings, so that they are thereby made of circular and enlarged form at each end, and the grain is more easily passed through it by reason of the spear-point standing at the middle of the length of the This construction forms a rigid' ends of the latter and extending around each side of the point.

The extent of the space between the openings will be governed by the special use of the screen.

I claim as my improvement- ,y

l. A screen for grain-separators, constructed of a sheet-metal platform corrugated and having approximately heart shaped openings standing crosswise, ridges c, formed between these openings inclining upward from the outer edge of the middle of one opening to the inner edge of the middle of the next opening and terminating in the latter in spearpoints d, whereby to form inclines e which slope from each side of said spear-points toward the inner end of the platform and terminate in said openings, substantially as described, fer the purpose specified.

y 2. A sheet-metal platform-screen for grainseparators, formed with the longitudinal corrugations, intermediate upwardly inclined spear-pointed ridges c (l, and the openings having enlarged rounded ends formed bythe ridge spear-points and extending on each side of the latter7 as shown and described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

CHARLES CLOSZ.

Vitnesses:

A. E. H. JOHNSON, PHILIP F. LARNER,

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