| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-core writing implement capable of preventing surely a seal peel from running off and floating up. SOLUTION: A tip side of a tip hole 3c of a shaft cylinder 3 is diameter-expanded dish-facedly to prevent surely the seal peel 20 from running off and floating up, in this multi-core writing implement of the present invention. Burr is hardly generated further from a front end angled part 23b of a wall face forming the tip hole 3c of the shaft cylinder 3 toward a front side, when injection-molding the shaft cylinder 3, by this constitution. When the burr is generated, not only the appearance of the shaft cylinder 3 gets worse, of course, but also the risk of catching the seal peel 20 by the burr exists when advancing and retreating a refill 2, and that may act as a factor of the running-off and floating-up of the seal peel 20. The full length of the shaft cylinder 3 is easily brought within an allowance range, when injection-molding the shaft cylinder 3, as an effect of restraining the burr from being generated. COPYRIGHT: (C)2009,JPO&INPIT
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