| 摘要 |
PROBLEM TO BE SOLVED: To ensure an emergency refuge exit automatically opened for rapid refuge when pressing force is applied by torsion and distortion generated to a wall and a door due to an earthquake in the door closed state of an entrance. SOLUTION: This normal entrance door common to an emergency exit is so constituted that both joint side peripheral edges of outer rails 7 of a normal entrance door 5 closably provided at a building entrance 2, and an emergency escape plate 6 fittingly mounted in the outer stiles 7 are made to butt in skew angle end face shape opened onto the predetermined emergency refuge direction and that a V-shape scraped opening is provided on one side of both joint side peripheral end face, while a freely protruding/receding engaging protrusion of arcuate head shape entering the V-shape scraped opening is provided on the other side.
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