| 主权项 |
1. A foldable ladder having multiple ladder segments that fold and unfold relative to each other, each ladder segment including one rung element and multiple side rail sections that unfold for deployment to form box-shaped side rails of the ladder, adjacent ladder segments being connected to each other by hinge joints, the ladder including locking features at the hinge joints for preventing relative pivoting movement of adjacent ladder segments by more than about 180 degrees. |
