| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of a warp by heat without narrowing a degree of freedom of design, by fixing and connecting an indoor side rail member and an outdoor side rail member opposed to the member on insulation material at the center part of the longitudinal direction respectively, and allowing heat expansion of a part except for each fixing part in both rail members. SOLUTION: A hanging root side rail 1 is provided with an indoor side rail member 2, an outdoor side rail member 3 opposed thereto, and a long heat insulation material 4. The heat insulation material 4 is longitudinally provided with a heat insulation side engagement part slidably engaged with the edge of the hook-like engagement part 3a of the outdoor side rail member 3. Both the rail members 2, 3 longitudinally slidably engage the heat insulation material with the groove-like engagement parts 2a, 2a of the indoor side rail member 2, and the edge of the hook-like engagement part 3a of the outdoor side rail member 3 is engaged with the heat insulation material side engagement part 4a of the heat insulation material 4. The edge is fixed on the heat insulation material 4 by a machine screw penetrating the groove-like engagement part 2a, the heat insulation material 4 and the hook-like engagement part 3a at one part of the longitudinal direction of both the rail members 2, 3 respectively. |
