| 摘要 |
<p>A ladder made of composite material comprises a plurality of rungs having an elongated body (19) provided with at least one connecting portion (3) adapted to engage an upright (4) of a ladder. Engagement means (5) locks the rung (2) to the upright (4); this means comprises a coupling element (6) made by co-moulding on the connecting portion (3) of the elongated body (19) or, alternatively, on the connecting seating (20) of the upright (4), a mechanical fastener (9) operatively acting in an installation housing (8) of the coupling element (6) and a locking element (10) adapted to prevent disengagement of the mechanical fastener (9). The ladder (1) is made through the following steps: arranging the rungs (2), simultaneously arranging a pair of uprights (4), associating the coupling elements (6) either with the connecting portions (3) of the rungs or with the connecting housings (20) on the uprights and finally rigidly linking rungs (2) and uprights (4) together by screws (9) provided with locking screw anchors (10) fitted in the installation housings (8). <IMAGE></p> |
