Freestanding Modular Spiral Staircase

Abstract

A freestanding, adjustable, modular spiral staircase embodied in a unique method of spiral staircase design is provided. The steps of the spiral staircase are arrayed and supported in a circular pattern around a central column with the outside edges or leading or trailing corners of the steps are supported by three peripheral columns, while step posts interconnect adjacent steps. Many parts are interchangeable and the steps adjustable to allow for shortening or lengthening the staircase. The base of the staircase unit is heavy to provide maximum stability and to prevent tipping.

1 . A freestanding spiral staircase, comprising:
 a base;   a top platform;   a center post extending between the base and the top platform;   a plurality of triangular steps, wherein an acute vertex of each triangular step is connected to the center post in such a way as to form a helical configuration along a longitudinal axis of the center post;   a plurality of peripheral posts extending from just inward of a periphery of the base to a corner of one of the plurality of triangular steps; and   each peripheral post is connected to at least one step of the plurality of triangular steps.