| 摘要 |
PROBLEM TO BE SOLVED: To improve heat insulation performance by preventing fixing means to be exposed to an indoor side while fixing a resin frame to a metal frame from the indoor side by the fixing means.SOLUTION: A heat insulation sash comprises a window frame which is made by installing a resin frame on an indoor side of a metal frame, and a sash which is openably and closably installed in the window frame. The resin frame comprises a main resin frame which is installed on the metal frame from an inner peripheral side by connection means, and a sub-resin frame which is engaged on the indoor side of the main resin frame. The sub-resin frame has a hollow part. The hollow part which stores a fitting section of the main resin frame to the metal frame of the main resin frame, is formed by engaging the sub-resin frame to the main resin frame fit on the metal frame.SELECTED DRAWING: Figure 3 |
