| 摘要 |
The apparatus which is the subject of the invention comprises a main body 1, moulded in a single piece, which forms the casing, the helix 2 and the discharge opening 7, on which is engaged and fastened a moulded piece 11 which supplements the helix, closing it at the front, and forms the inlet opening 12, an additional cover 30, which forms the grille 31 via which suction takes place, being coupled to and fastened over the front face of said body in an easily detachable manner by means of a pressure- clamping system 34-39. <IMAGE>
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