| 摘要 |
PURPOSE: A door frame is provided to reduce an error rate by accurately welding a horizontal frame in a vertical frame and to reduce the amount of processes. CONSTITUTION: A door frame comprises vertical frames(10) and horizontal frames(20). The vertical frames are made of steel plates and are vertically positioned in both sides of a door. Both ends(11) of the vertical frames are bent. The horizontal frames are made of steel plates and are welded in the top and bottom of the vertical frames. Assembly pieces(21,22) and insertion grooves(23,24) are formed in the horizontal frames. The insertion grooves are inserted into the vertical frames. |
