| 摘要 |
PROBLEM TO BE SOLVED: To provide a door device which is improved in heat insulation performance at an abutting portion of divided heat insulation doors. SOLUTION: The door device is of a vertically two-divided structure consisting of the heat insulation inner doors 101, 102, and a gasket 103 or 104 is mounted at least on one of a lower end face of the upper heat insulation inner door 101 and an upper end face of the lower heat insulation inner door 102, to thereby block a gap between the doors. The end faces are formed such that the lower end face of the upper heat insulation inner door 101 overlaps the upper end face of the lower heat insulation inner door 102 in a thickness direction. Thus by filling heat insulation materials 101a, 102a to each end face of the heat insulation inner door, no cavity is present in a heat insulation wall, and therefore the heat insulation performance and sealing performance at the abutting portion are improved. COPYRIGHT: (C)2007,JPO&INPIT
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