The present invention is more dense Pay high degree of draft prevention tool by using a curved surface of the roller, and also the opening and closing of the door is the one not interfering by rolling a flop roller. A gap could be the one of the rollers underneath the door mounting at the last minute from the grip of the door width up shame it is assumed that a degree of adhesion by pressing on three springs. By two axes made of thin metal, by utilizing the movement of rotation, when it is not needed to raise the top, it is possible to keep is fixed. .BACKGROUND
展开▼
