| 摘要 |
A cylinder-shaped automatic MDF(Main Distribution Frame) is provided to pierce holes as many as added households on a cylinder entrance if the added households exist, and to insert electric wires into the pierced holes while inserting system lines by piercing the system lines as adding disks as many as the lines, thereby more easily and conveniently adding the households. Electric wire units of telephone lines and system lines are inserted into a cylinder shape. Columns(gears) are capable of rotating disks. The disks play switch roles. Holes for obtaining spaces into which the gears are inserted are pierced on the center of the cylinder shape, and 2-layer structured tunnels are pierced within surface thickness on the surface so that the system lines and the telephone lines are inserted, to insert each line thereinto. The telephone lines enter the holes pierced from the entrance of the cylinder shape, while the system lines surround the telephone lines to form an oval shape. |
