Prefabricated staircase assembled on site - has side plates fixing treads into lateral support recesses on side rails

摘要

The top and bottom rail of the staircase (11) are thicker than the side plate or lateral carrying element (5) so that the plate is flush to the rails on the outside leaving a constant depth recess on the inside. The steps are wide enough to penetrate this recess and are held there by shaped plates (12) and counter plates (13) of thickness equal to the recess depth. Risers (8) are fixed to a notch (14) in the back of the step below and to a notch (15) near the front of the step above, so that the treads slightly overhang (16) the risers.