Staircase e.g. spiral staircase, for e.g. house, has eight spacer pillars and three caissons with steps, where two caissons are identical and structure of staircase rests on base plate that has four casters with brake

摘要

The staircase has a base structure made of standard units such as 8 spacer pillars (5) with double tongue, and three caissons (10) comprising steps (7), where two of the caissons are identical. The structure of the staircase rests on a base plate (1) forming the base of the staircase and the first step (4) is attached on the plate. The plate has four casters with brake to respond to specific applications.