Method for joining frame members

Abstract

A method for joining frame members, wherein frame members are joined without forming the intricate configuration on the end part of the frame members, and without using the joining members. In this method, first, fit the sash 2 into the first fitting groove 11, which is formed on the mold 6. next, fit the side frame 3 into the second fitting grooves 12, and further fit the vertical frame 4 into the third fitting grooves 13. Consequently, the sash 2, the side frame 3 and the vertical frame 4 are arranged to the mold 6. After fitting the sash 2, the side frame 3 and the vertical frame 4 into grooves 11, 12 and 13 respectively. Pour the molten metal into the mold 6 until the sash 2, the side frame and the vertical frame 4 are completely covered with the molten metal. And after the molten metal is poured into the mold 6, cooling the molten metal in a predetermined time. And after the molten metal becomes harden, remove the mold 6. Consequently, the casted joining member 5 is obtained wherein each end pert of the sash 2, the side frame 3 and the vertical frame 4 are joined by wrapped up in cast metal

What is claimed is:  
     
         1 . A method for joining frame members comprising; 
 Fit frame members into a mold; and wrapping up the fitting part of frame members and mold in cast metal.    
     
     
         2 . A method for joining frame members according to  claim 1 , wherein each frame member is made of aluminum alloy.