| 摘要 |
PROBLEM TO BE SOLVED: To provide an entrance door having both measures for prevention of crimes and emergency evacuation. SOLUTION: An opening section 4 is opened in the central part of a door main body. A bar material is mounted to the opening section from an indoor side in a detachable manner, and the width of the opening section 4 can be varied with B (width having enough size for an adult to go in and out) and C(≈B/ 2). An auxiliary door 6 for opening and shutting the opening section 4 from the indoor side is provided. Usually, the auxiliary door 6 is shut in a state to mount the bar material 5. In the case of seeing a visitor, the auxiliary door 6 is opened, and the opening section 4 is opened with width C. The width C is sufficiently enough to receive mails, baggages, etc., and no outside visitor can enter. In the case of emergency evacuation, the auxiliary door 6 is opened to remove the bar material 5, and the opening section 4 is opened with width B. The width B is sufficient enough for the adult to easily go out.
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