Patent ID: 8484898

Claim:
A natural ventilation apparatus comprising: a window frame which is installed in a building; a framed panel disposed in an opening portion defined by said window frame; and an opening and closing means for allowing the framed panel to open and close the opening portion on the basis of an air current, wherein said opening and closing means includes a first supporting mechanism for supporting one portion of said framed panel liftably in a vertical direction and a second supporting mechanism for supporting another portion of said framed panel, which is located below said one portion of said framed panel in the vertical direction, movably in a direction toward an interior or exterior of the building and wherein the direction is perpendicular to the vertical direction, said first supporting mechanism includes a portion of a slot that has a longitudinal axis extending to parallel to the vertical direction, said second supporting mechanism having a shaft body which is fitted to said another portion of said framed panel; a support member having a supporting surface for movably supporting said shaft body in the direction toward the interior or exterior of the building, a longitudinal axis of the support member being parallel to a horizontal direction in a state where said framed panel is in an open position the horizontal direction extending substantially 90 degrees to the vertical direction, said supporting surface being inclined upward from a building exterior side toward a building interior side with respect to the horizontal direction, an angle of inclination of said supporting surface with respect to the horizontal direction increasing from the building exterior side toward the building interior side.