Transparent plastic staircase - with a central column and spiral treads

摘要

The staircase is fabricated entirely of transparent or translucent plastic and consists of a central load bearing column with successive cylindrical elements between the stair treads whose inside edges are seated in the column and a hand rail of curved sheet forming a cylinder with the same axis as the column, the hand rail being attached to the outer ends of the treads. A prefd. material is polymethylmethacrylate. The cylindrical column is buried in the ground and pref. attached to the flooring by a steel collar surrounding the bottom cylindrical element. Each tread may enclose a cylindrical element of reduced diameter embedded in the successive sections of the column. Previous plastic staircases have used a conventional load bearing column. The use of a transparent plastic column gives the visual advantage of a staircase totally in plastic material.