| 摘要 |
A filtering case (1, 30) is comprised of two superimposed parts, respectively an upper one (2, 31) and a lower one (43, 32), which slide telescopically the one within the other. The upper part (2, 31) bounds a slurry receiver chamber (2a, 51) and has an apertured (4, 61) bottom wall (8, 40a); the lower part (3, 32) is guided through the aperture (4, 61) between a first position outside the slurry receiver chamber (2a, 51) and a second position at least partway inserted thereinto. The lower part (3, 32) has filter-forming side walls whereby the overall filtering area of the case (1, 30) increases with the depth of penetration of the lower part (3, 32) into the slurry receiver chamber (2a, 51). |
