| 摘要 |
PROBLEM TO BE SOLVED: To reduce heat conduction by separating a resin frame member constituting an upper frame material into an outdoor resin frame member attached to the outdoor internal circumferential part of a metal frame member and an indoor resin frame member attached to the indoor internal circumferential part, and integrally connecting the metal frame member constituting a lower frame material thereto via a heat insulating material. SOLUTION: A resin frame member 3 for an upper frame material 1A is separated into an outdoor frame member 3A attached toward the outdoor side of a metal frame member 2A than an attachment wall A1, and an indoor frame member 3a attached toward the indoor side than the attachment wall A1. A metal frame member 2 of a lower material 1B is integrally connected thereto via an heat insulating material 8 in such a state as separating the outdoor side metal frame member 2B from the indoor side metal frame member 2b at an appropriate interval. The both metal frame members 2B, 2b have dovetail grooves 21, 31 bored opposedly in opposite walls B2, b2 and a heat insulating material 8 is fitted in across the respective opposed dovetail grooves 21, 31. The resin frame member 3 of the lower frame material 1B is separated into an indoor side resin frame member 3b fitted in across the inner/outer rails B5, B6 and an indoor side resin frame member 3B fitted in toward the indoor side than the outer rail B6. |
