| 摘要 |
<p>The sectional tubular portal frame (1,5,6) has an inverted 'V' shape with an apex curve and is for incorporation in a training frame for runner beans. The portal frames may be mounted transversely at longitudinal intervals, using cruciform components (6) to make a bayonet connection with infill rails (7). The connection may use transverse pins (3) fixed inside the socket ends of the cruciform components. These engage 'L' shape slot holes (4) in the housed ends of the rails etc. (5,7).</p> |
