Module for device to permit access between two levels i.e. staircase, of building site, has side stair stringer extending on lower side of steps away from side edges and following axis parallel to and away from another axis

摘要

The module has a side stair stringer (13) parallel with a lower stair stringer, where the stair stringers connect steps (7a, 7b) together. Each step comprises a heel (9) and two side edges (10). Each step is mounted pivotingly on the lower stair stringer at an axis extending along the heel. The side stair stringer extends on a lower side of the steps away from the side edges and follows another axis parallel to and away from the former axis.