| 摘要 |
PURPOSE: To reduce operation mistakes such as the mistake of the stretching of a belt and the falling-off of the belt and the like at the time of the execution of works, to improve workability and to mount a protective cover easily on the belt in a ladder device for a ceiling, which has a folding type ladder housed in a ceiling opening section under the folded state and the rotary type cover opening and closing the ceiling opening section and in which the cover is opened and closed and the ladder is expanded and contracted by winding or delivering the belt, in which a front end is fitted to the cover, by a winder on the ceiling side. CONSTITUTION: A belt 33 is divided into split belts 33a, 33b in the longitudinal direction, and both belts can be connected by a connector. When a ladder device is divided into a ladder unit 76 on the ladder 13 side and a ceiling opening unit 75 consisting of a frame body 5, a cover 10, etc., and executed, the ceiling opening unit 75 is executed, and the ladder unit 76 is fitted to the cover 10. The split belt 33a on the ceiling opening unit 75 side and the split belt 33b on the ladder unit 76 side are coupled by a connector. |
