| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a door for entrance, which can not be broken by any tool in a short time. SOLUTION: The outdoor side face 23a of one vertical frame 23 constituting a door frame is shaped as having a projection from an intra-plane direction inner side part 40 and an intra-plane direction outer side part 41, and a channel- shaped protruding piece 42 is furnished in a single piece with another vertical frame 28 to constitute a door, and a foremost part 42a is positioned confronting the intra-plane direction outer side part 41 in such a way as going beyond the projection. Even if a try is made to bend the piece 42 using any tool, the tool interferes with the wall surface and it is not possible to bend the piece 42 in a short time, so that the door can not easily be broken shortly.</p> |
