| 摘要 |
PROBLEM TO BE SOLVED: To provide a door-derail-prevention device with which an engagement part of a door with a doorsill can be exchange without removing the door when replacing the engagement part.SOLUTION: The width of an engagement part 11 is made wider than that of a groove part 6b of a doorsill 6, and the thickness of the engagement part 11 is made thinner than the width of the groove part 6b of the doorsill. The width of the engagement part 11 is made smaller than the width of a space part 6a so that the engagement part 11 can rotate centering around a thin shaft part 12b in the space part 6a. The height of the engaging part 11 is made lower than the height of the space part 6a so that the engagement part 11 can rotate centering around the thin shaft part 12b in the space part 6a. The width of a hole part 3b formed into the bottom part of a landing-area door 3 is made larger than the thickness of the engagement part 11. When replacing the engagement part 11, the engagement part 11 and the guide part 12 are dropped in the space part 6b, the engaging part 11 is rotated so as to be parallel to the guide part 12, and the engaging part 11 and the guide part 12 are taken out from the doorsill 6b through the groove part 6b and the hole part 3b. |
