| 摘要 |
A device (10) for sifting a siftable material (12) comprises at least three nestable trays (20). The trays (20) are stacked to form a vertically stacked array. Each tray (20) has a base (22) having a plurality of ribs defining a plurality of openings (26) sized to permit the material (12) to pass through, while preventing passage of large objects. The openings (26) of each tray (20) are arranged in pre-set pattern so that pairs of trays (20) may be nested together with the openings (26) of one tray blocked by the ribs of the other. The trays (20) may be identical with the openings (26) arranged asymmetrically in the base of each tray, so that the necessary interference or blocking is achieved by rotating each tray relative to the adjacent tray. Alternatively, the openings can be symmetrically located with two different trays being provided, having complementary patterns of openings. The stacked array of trays can be configured as a cat litter container, or used for sifting a variety of the material.
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