| 摘要 |
This invention concerns a built-up rail post, by which the steps of spiral stairs and particularly of dismountable spiral stairs, are connected with the hand rail. The invention also covers the components of same rail post, said built-up rail post consists of an allthreaded, load-bearing central rod, made preferably of a metal, and of a plurality of covering tubular elements, slipped on to said load-bearing core, being the connection between each covering element and the load-bearing core ensured by screw sockets fast with the covering element ends and screwed on the threading of load-bearing core, thus stabilizing and stiffening the assembly. |
