| 摘要 |
<p>A suspension rail comprises a rail body (18) having slide track means (22,24) extending lengthwise of the rail, said slide track means (22,24) being adapted to slidably support hangers thereon. The slide track means comprises two parallel tracks (22,24) of low friction plastics held in or by the rail body (18) and spaced by the rail body (18), so that a hanger (38) suspended on the rail contacts the rail only at the two tracks (22,24).</p><p>The body (18) is a one piece extrusion of aluminium, and there are two rods (22,24) which form the tracks, these rods (22,24) being in grooves (18A,18B) in the body (18). Rods (22,24) of right angled triangular cross section are preferred as they can be inserted and clamped easier and held more securely than circular rods, and made to project further from the body than circular rods.</p><p>The invention provides an advantageous means (110) of providing jumpers for accommodating rod expansion joints and rail system switches.
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