| 摘要 |
<p>A step has a load-bearing structure (10) and a torus (40) as a means interconnecting a tread (20) and a riser (30) of said step. The torus (40) has on its backside two longitudinal grooves (51, 52) accommodating two portions (55, 56) of a laminar member (SO), which is placed upon the load-bearing structure (10) and constitutes the resting surface for the tread (20). The grooves (51, 52) are perpendicular to each other and spaced from each other by a portion (45) of the rear contour of the torus (40).</p> |
