| 摘要 |
<p>The present utility model relates to collapsible ladder that features a unitary inverted U-shaped body having a rectangular profile that serves as a hand rail and body support, and tiles that solve the problems on safety, rigidity, stability, and weight, among others. The inverted U-shape serves actually as a knee-brace and at the same time as a handrail. The knee brace is used for support and the handrail is used for safety purposes.</p> |
