| 摘要 |
<p>A pipe or cable ducting 10 is formed from two groups of interconnectible semitubular plastics sections, 12 each group of sections forming approximately one half of the ducting and is provided with releasable connection means comprising a plurality of circular cross-section bosses 28 and a plurality of identically-spaced recesses (30). The recesses (30) are elongated in the longitudinal direction of the elongate section, thereby providing a slight amount of freedom in that direction and increasing the longitudinal flexibility of the ducting. When two semitubular sections (12) are placed with their concave surfaces facing each other, the bosses (28) along one edge of the sections are adapted to be seated in the recesses (30) in the corresponding edge of the other section. <IMAGE></p> |
