Folding safety ladder with U=shaped folding stringer

摘要

The stringer (2) has a covering strip and evens out bumps on the building. The rungs (3) are made of profiled square-sectioned tubing. Reinforcement tubes (18) or bevelled profiles form connectors for the ladder. A pivot bar (5) is joined to the rung and linked in a pivot bearing (6). The ladder is fixed to the building by brackets (7). Part (9) of the folding stringer is screwed to the upright stringer.