Carrier string e.g. flat inner string, for use in balanced half-turning staircase in building, has fixation units provided on end surface between fixing surfaces and rail, where fixing units are connected with complementary fixing unit
摘要
<p>The string (1) has a tubular and helicoid shaped panel made of a single piece with a corresponding protection rail comprising fixation surfaces (2) of steps (3). The panel comprises fixation units provided on an end surface between the fixing surfaces of steps and the protection rail, where the fixing units are connected with a complementary fixing unit. The fixation surfaces of the steps are provided on an internal surface of the string.</p>
