PROBLEM TO BE SOLVED: To provide a projected insersion window excellent in weight balance characteristic in the case of inversion, making inverting operation of a ventilator smoothly without requiring power and, at the same time, preventing the ventilator from being suddenly slipped off even if hands are released by mistake. ;SOLUTION: A projected inversion window is constituted of a window frame 2B and a ventilator 3 mounted to an opening of the window frame and opened and closed while sliding with the upper end edge side as the rotary center. In that case, first link 13 and second link 14 having every one end of them connected respectively to each of both insides of the window frame 2B in a turnable manner are arranged up and down to provide, at the same time, an oscillation arm 15 havning one end connected respectively to both sides of the ventilator 3 in a turnable manner is provided, and the other end of each of the first link 13 and second link 14 is connected to the other end of the oscillation arm 15 in a turnable manner.;COPYRIGHT: (C)1999,JPO
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