| 摘要 |
<p>The base (12) and cover (13), both of semi-rigid plastic, are extruded together, and, opt., the longitudinal hinge strip (16), of more flexible, e.g. elastomeric material, is co-extruded with them. Opt., the hinge strip is a flat band separately manufactured and attached by adhesive so as to connect the side (20) of the base channel to that (24) of the cover, along the hinge position (15). The end (29) of this side of the cover is angled inwards, to rest on the lip (30) of a groove (31), at the top of the base channel side (20), when the cover is tilted about 45 degrees. to the channel base (18). To close the trunking from this stable, half-open position, the cover is rotated about the hinge till the turned-on rim (26) of the opposite cover side (23), passing over the tip of the corresponding side of the base (19), snaps into a groove (21) provided on the outer face of that side. At the same time, the angled end at the hinged side of the cover snaps into the adjacent groove (30) in the base side, completing the closure. Several variants, employing similar hinges, are described.</p> |
