| 摘要 |
PROBLEM TO BE SOLVED: To prevent the slacking of a shaft twisted into the barrel of a dart. SOLUTION: The dart (10) has the barrel (20) to be held with fingers, a point (30) mounted at one end part of the barrel (20) to pierce a mark, a shaft (40) which has a screw shaft (41) at one end part to be twisted into a thread hole (for example, shaft mounting hole 22) formed at the other end of the barrel (20) with a flight (50) linked to the other end and an energizing member (60) which is fitted into the thread hole (for example, shaft mounting hole 22) of the barrel (20) to energize the screw shaft (41) of the shaft (40) twisted into the thread hole (for example, shaft mounting hole 22) in the direction of coming off the thread hole (for example, shaft mounting hole 22). COPYRIGHT: (C)2008,JPO&INPIT
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