| 摘要 |
The step (1) has a metal sheet having a constant cross-section, where the metal sheet includes a planar upper surface (4) extending to front and rear sides, and lower surfaces (8, 14) inclined towards an upright (2). The lower surfaces extend after bending to tangent surfaces (10, 16) fixed at the front and rear of the upright along an axis of the upright. Each tangent surface is provided with a single fixing unit (18) that is independent of that of the other tangent face. Each end of the upper face includes a cutting for passage of the upright. An independent claim is also included for a carrier system. |
