| 摘要 |
<p>The specification discloses a filling/discharging structure (10) for a flexitank. The structure (10) comprises a main part (12) and a nut (32). The main part comprises an externally threaded spigot (20) encircled by a disc-like flange (22). The flange and nut have concentric patterns of ribs and grooves. The grooves are designated 38, 40, 42, 44 and the ribs are on the inner face of the flange (22) and not visible in the drawing. When the nut (32) is screwed onto the spigot 20, the ribs enter the grooves (38, 40, 42, 44) and the wall of the flexitank is gripped between the ribs and grooves. The configuration is such that the radially innermost rib and groove pair grip the tank wall most tightly and the grip on the tank wall by the rib and groove pairs outwards of the innermost rib and groove pair decreases with distance from the innermost rib and groove pair.</p> |
