| 摘要 |
PURPOSE: A top-down evacuation ladder is provided to prevent to be used for a path for an invasion and to be waterproof and soundproof by locking an upper cover. CONSTITUTION: A top-down evacuation ladder comprises a ladder box(100), an upper cover(200), and a lower cover(300), and a cracking confirmation sheet. The ladder box comprises a locking member and a detection sensor. The locking member locks the upper cover for preventing to be used for a path for an invasion. The detection sensor detects whether the upper cover is opened. The upper and lower covers open or close the upper and lower surface of the opened ladder box. The cracking confirmation sheet is combined to the boundary of the opening surface of the ladder box. |
