Steps formed in recesses wall of vertical shaft may have patterned step tread plates and colored or fluorescent markings are applied for guidance of person using shaft

摘要

The vertical shaft (B) has a series of step elements (S,T) recessed into the profiled plates (W) forming the walls. There is a transverse step (6) with a gripping tread pattern and a riser with colored paint markings (M). The markings may be applied round the edges of the step recess. A locking tongue (8) has an aperture accommodating a fastening bolt (A2).