Prefab. narrow cantilevered staircase - has industrially pre-cut and mounted central stringer, spacers and step supports

摘要

The central stringer is for stairs constructed in a cantilevered layout. It has one or more turns, fixture plates for attachment to floor and ceiling, and step carriers, in stairs, esp. for installation in a very confined space, with a prescribed height between floors and a prescribed entrance opening size. Cutting to size of stringer length, and of intermediate pieces (6), and bent sections (7,8), and assembly of stringer (3) take place in the workshop; likewise division of stringer length for step-carrier fitting and attachment of step-carrier to stringer. This set of stairs is very compact, simple and inexpensive, economical in material, and easy built in without-skilled labour.