Spiral staircase assembly pieces - has vertical step panels engaging with horizontal steps and connected to central column risers through horizontal tie-rods

摘要

The stepladder has a series of risers (1), each fixed to a vertical step panel (4) using a horizontal tie rod (6) which also fixes the base of an exterior handrail support (5). Vertical screws fix each vertical step panel to the step (3) immediately profiled brackets (2). Each vertical step panel has two lateral lugs that engage respective notches in the corresponding riser and support, and top edge of the vertical step panel has a longitudinal tongue that engages in a groove in the underside front edge of the step above.