DOOR AT LANDING OF ELEVATOR

摘要

PROBLEM TO BE SOLVED: To prevent a door at a landing from curving in being heated on fire, and improve the fireproof performance. SOLUTION: A back board 2 bonded to a rear side of a front board 1 is made of a material having a coefficient of linear expansion higher than that of a material of the front board 1 for reducing the difference in elongation amount between the front board 1 and the back board 2 in being heated.