| 摘要 |
<p>A screw-thread coupling structure is disclosed. The screw-thread coupling structure includes external and internal-thread coupling parts. The external-thread coupling part forms external- thread formed sides and external-thread not formed sides. The internal-thread coupling part forms internal-thread formed sides and internal-thread not formed sides. The external and internal-thread coupling parts can relatively enter each other, in parallel, and then couple to each other, thereby reducing the coupling period of time.</p> |
