| 摘要 |
A natural ventilation apparatus for a window is provided to assemble easily and to cut down on the cost with a simple structure. A natural ventilation apparatus for a window is installed between a window glass and a window frame and formed by coupling an outer frame(10), an inner frame(20) and grills(30) using couplers and installing an opening and closing flap(40) to one side of the inner frame rotatively for opening and closing air flow passages of the outer frame and the inner frame. The outer frame is composed of upper and lower frames(12,14) to have an air vent for letting air in and out, the inner frame is provided with a connecting hole(25) to couple the top of the opening and closing flap, an insert(22) and a groove(23) to couple with an insert groove(12a) and a projection(14a) of the upper and lower frames of the outer frame and hollows(21a,21b) having air layers to cut off dew condensation due to a difference in temperature between the outside and indoors, and the grill is provided with upper and lower coupling ribs(32,34) to couple with first and second coupling projections(26,27) of the inner frame and attached with a filter to cut off influent impurities from the outside. In addition, two finishing members(50A,50B) are coupled to the inner frame and the upper and lower frames of the outer frame by fastening members such as screws, bolts, etc. and attached with an opening and closing device for rotating the opening and closing flap, wherein the opening and closing device is composed of an operating switch(51) installed to the two finishing members rotatively, a rotary cam(52) coupled to the end of the operating switch to rotate together with the operating switch and provided with a coupling pin(53) to couple with the opening and closing flap, a stopper projection(52a) projected to the outer circumferential surface of the rotary cam, and an arc-shaped fixing piece(55) coupled to the inside of the two finishing members and provided with a fixing groove(55a) to house the stopper projection selectively when the rotary cam rotates. |
