| 摘要 |
PURPOSE: To provide a working method for a lighting fixture fitting portion by which working processes are lessened, and further reliability on strength is heighten in the working method for the lighting fixture fitting portion. CONSTITUTION: A cold or hot plastic deformation working, for instance, a forging working A, a press working B, a spinning working C, or the like is conducted on the tip of a lighting pole 20 made of metal-made tube body. Thereby, the tip portion of the lighting pole 20 is molded into a thin diameter cylinder shape so as to form a lighting fixture fitting portion 22. |
