Abstract: This invention relates to a louver shutter with movable louver boards in which a set of adjustable louver boards capable of opening and closing are aligned in one side, the upper part, or lower part of the panel of a louver shutter or door, thereby to permit good ventilation, lighting and shielding of the room, to serve security purpose, and to prevent entry of rain water and harmful insects into the room. This invention provides a very practical and inexpensive louver shutter of simple mechanism which is sturdy in construction, easy to operate, and can be mass-produced, without any disadvantages encountered in conventional ones as disclosed in U.S. Pat. No. 3,991,518.

Abstract: A louver shutter having a louver slat adjusting device provided with a driving member moving up and down along a supporting frame provided intermediate the side frames of the louver shutter so that, when said driving frame is moved up and down relatively with the supporting frame, a supporting shaft for each louver slat may be rocked and also including a mechanism for locking the supporting frame and driving frame.