| 摘要 |
<p>The invention deals with a folding attic staircase where the rotating upper cover (2) is multi-layered and fire-proof, while the lower rotating cover (3) with a multi-level ladder (5) is attached with the help of a four-folding mechanism (4) on the opposite side like an upper cover (2) connected to the chassis (1) on two sides. The area under the rotating point of the bar (6.1) of the shearing mechanism (6) features a shearing mechanism hub limiter (7).</p> |
