| 摘要 |
PURPOSE:To provide a low-cost threaded component of synthetic resin having female threads on an inner periphery. CONSTITUTION:Molten resin is injected in a cavity 3 between a lower mold 1 and an upper mold 2, cooled.solidified to obtain a molded form 4, the mold 2 is then slightly raised to form a clearance around a female threaded part 4a of the form 4, a threaded core 9 is rotted by a motor through rotary force transmitting means 12 arid a gear 10 in this state to unloose male threaded part 17 of the core 9 from the part 4a of the form 4. Accordingly, a drive force required for rotating the core 9 of the mold 2 can be reduced. |
