| 摘要 |
PROBLEM TO BE SOLVED: To obtain the entitled pipe smoothly reeling up a film by connecting and integrating the materials for plural pipes through respectively prescribed inner/outer fitting parts so as to make it difficult to deform though a rotation torque is made to reach, to surely transmit rotating force. SOLUTION: Synthetic resin coated metallic pipe material 11, whose cross sections are nearly circular, are plurally connected. Then the tip part of one connected pipe material 1 is deformed to be nearly in the shape of a diamond at its cross section to make the inner fitting part 2 and the tip part of the other connected pipe material 1 is deformed to be nearly in the shape of a diamond at its cross section to make the outer fitting part 3 to connect-integrate the material of the plural pipes 1 through these parts 2 and 3. In addition, it is desirable that the synthetic resin layer 12 of the part 3 is projected from the tip part of the metallic pipe 11 to form a coated cylindrical part 4. |
