Spiral staircase steps fixture - with screw-bolts through treads and carriers' cover and support plates

摘要

The steps, arranged round a central tubular column, comprise treads with a carrier incorporating a bottom support plate and a top cover plate for the tread. The screw-bolt passes through all three components, and is firmly tightened against both plates. Each step's support may be firmly braced downwards against the centre column; or both cover and support may be joined to it by a combined welding and screw connection. This system is attractive, stable and adaptable.