(57) Abstract Objective The window frame which becomes cause of falling of plate glass at the time of fireThermal deformation of the sash that tries is difficult to occur. Constitution Window frame the inside of the frame where confronts on indoor side of 2 and sash 15 lap structureAdult (inner circumference configuration component) 3 and chambranle inner circumference configuration body (inner circumference componentThe material) 17, namely, in the flame which at the time of fire rises in the interiorAs for the part which is done, su whose heat resistance is higher than the aluminum alloyIt does with the ten less steel. Advantages Window frame and sash in only aluminum alloy connectionWhen it compares with the former skylight which it does, window frame 2 and sash 15With the heat of the flame the deformation to be difficult to occur, plate glass 28 early stageThe fact that it falls inside can be prevented.
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