US807355A - Grain-riddle. - Google Patents

Description

No. 807,355. PATENTBD 1150.12,.1905.

w. E. CAMPBELL.

GRAIN RIDDLE.

APPLICATION TILED MAY 15.1905.

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UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Dec. 12, 1905.

Application filed May 18, 1905. Serial No. 260,923-

To aZl whom it may concern:

Be it known that 1. WILLIAM E. CAMPBELL, a subject of the King of Great Britain, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Grain-Riddles; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to grain-riddles for assorting corn.

It has for its object an improved form of the perforated sheet which comprises the main part of the riddle.

In the drawings, Figure 1 shows a portion of a perforated sheet. Fig. 2 is a plan of the same sheet. Fig. 3 is a portion of the side bar which forms the frame of the riddle. Fig. 4 is a perspective of a portion of the perforated sheet or screen and its frame.

The effective part of the riddle is made from sheet metal bent to produce a series of sharp angular corrugations or grooves running across the face of the sheet and with perforations through the walls of each groove, a perforation of one wall being near the angle bottoming thegroove and the perforation of the other sheet between near the apex angle between two grooves. The sheet of metal is secured in a grooved side bar 2, of wood, and the side bars are held together by cross-bars 3, which complete a frame holding the bent and grooved perforated metal of the riddle. The corrugations serve to turn the kernels properly to cause them to pass through the holes. It should be noted that the sides of each corrugation are of unequal length and that each side is at approximately right angles to its companion side and to the adjacent side of the adjoining corrugation, the short side of each corrugation being nearly perpendicular to the plane of the sheet as a whole.

In operation this riddle is given a sharp vertical jerking rising-and-falling motion and a short to-and-fro motion, which causes the kernels of grain to bound vertically and to advance over the riddle because of the to-andfro motion of the riddle itself. In the performance of this movement the screen is tilted lengthwise to an angle of about thirty degrees from horizontal and with the short sides of the corrugation facing the direction in which the longitudinal jerking motion is imparted. Some few of thekernels of grain fall directly through the holes on either side of the corrugations. Others fall upon the comparatively long incline afforded by the side 4 and if of the proper size pass through the holes 5, whose lower edge is flush with the lower edge of the inclined side 4. If a kernel is too large, the nearly-vertical position of the side 6, combined with the next forward jerk of the screen, serves to advance it toward the upper or delivery end of the screen. The smaller grains or kernels of corn, which are to be sorted from the larger ones, strike sidewise on the inclined surface 4 and slip through the perforations 5, whose size is made a matter of very careful regulation. Occasionally a kernel which strikes on the apex 6 between two grooves is worked forward through the upper hole 7. The larger irregular kernels, which are to be rejected, pass over the end of the riddle. The smaller thin and regular kernels, which are selected for seed, pass through and are caught in the receptacles underneath the riddle. This serves to select the thin regular kernels which grow at the middle of the car from the roundish and thicker, kernels at the tip and from the regular and irregular kernels at the base of the ear.

What I claim is 1. A sorting-riddle for corn, having in combination with a frame, a sheet of metal whose surface is sharply corrugated the sides of each corrugation being of unequal length and provided with perforations for the passage of grain-kernels therethrough, said perforations lying near the base of one slanting side of each corrugation and near the apex of the other side, substantially as described.

2. A sorting-riddle for corn having, in combination with a frame, a sheet of metal angularly corrugated, the sides of each corrugation being of unequal length and diversely angular to the plane of the sheet as a whole, the shorter of each of said sides having a series of perforations whose lower edges lie in the line of union with the adjacent long side, and the long sides of each corrugation having similar perforations near the apex, substantially as described.

3. A sorting-riddle for corn, consisting of a sheet of angularly-corrugated metal provided with perforations on each face of each corrugation, the perforations in one of the corresponding faces of each corrugation lying near the bottom and reaching to the line of union with aside of the adjoining corrugation, and the perforations on the other face of each corrugation lying near the apex thereof,

- substantially as described.

4:. A sorting-riddle for corn, consisting of a sheet of metal angularly corrugated, the sides of each corrugation being of unequal length. the shorter of each side having a plurality of perforations adjacent to its line of union with a side of the next corrugation and

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