Sifting device

(57) The equipment (10) for sifting the material (12) in which summary sieving is possible is equipped with the tray (20) made into at least three nests. The above-mentioned tray (20) is accumulated so that the arrangement repeated perpendicularly may be formed. While it permits that the above-mentioned material (12) passes each tray (20), it has the base (22) with two or more ribs which define two or more openings (26) by which a size setup was carried out so that passage of a large subject might be barred. The above-mentioned opening (26) of each tray (20) is arranged at the pattern defined beforehand, the above-mentioned opening (26) of one tray is a mode closed with the above-mentioned rib of the tray of another side, and the pair of a tray (20) is mutually made into a nest. A tray (20) may be the same about the opening (26) arranged asymmetrically in the base of each tray, and, as a result, a required interference or blockade is obtained by rotating each tray to the adjoining tray. Or the above-mentioned opening may be symmetrically arranged about two given different trays with a complementary pattern of an opening. The arrangement on which the above-mentioned tray was accumulated is used in order to be constituted as a bedding container of a cat or to sift various materials.