| 摘要 |
<p>The funnel has a body of rigid material and is flared between an outlet and an inlet. The body (1) is frusto-conical and the ends (9 to 12) form bending lines. The trunk has a quadrilateral section, almost square when bent. The edge (8) of the entry opening (7) has a notch (13) in the shape of a segment. This notch is situated at the level (9) of a folding edge. The material used is paper and the inside is varnish coated. The funnel is cut from sheet, bent and glued.</p> |
