| 摘要 |
PURPOSE:To suspend an apparatus with a heavy weight by winding up a wire, providing a female screw section to the inside circumferential surface and, at the same time, by providing an under cut section to the upper part thereof. CONSTITUTION:A wire 1 having a rhombic cross section and provided with plane sections of narrow width respectively on up and down surfaces thereof is formed. Among several paths from the lower end to about the center, the plane sections of the wire 1 rising and falling each other are adhered, and the wire 1 is wound up spirally. Among several paths from the lower end to the upper end, the wire 1 is deviated outward from a regular spiral winding course only in a specific interphase along the circumferential direction, and the plane sections are adhered to wind up spirally so that a deviation amount increases as it directs to the upper end, then an insert body provided with an under cut section 10 and a female screw section 10b is formed. |
