Spiral staircase with fixed central tube - has fastening elements, each consisting of half-shell, fitted radially inwards on each step and landing

摘要

The central tube (1) is secured to a support face in a vertical position. Steps and/or landings are connectable to it via fastening elements, which also define the step height spacing. Banister bars are fitted parallel to the central tube, radially outside the steps etc. to prevent step etc. rotary motion. Each fastening element consists of a half-shell (4), fitted radially inwards on each step (3), or landing for securing to the central tube. On the latter are inserted rings (5) on either side of a step etc. The rings grip over half-shell edges parallel to central tube axis. ADVANTAGE - Easy assembly even for very high staircase.