| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-core type writing utensil which makes the jamming phenomenon of writing-cores hard to occur when a writing-core to use is altered. SOLUTION: The inner circumference surface of a point tube 5 includes a tapered part 43, a Shoulder 44 extending from a tapered part 43 rear end, and a large diameter part 45 linearly extending from a shoulder 44 to an axial rear end side. The shoulder 44 elongates toward the outside in the radial direction of the point tube 5 from the tapered part rear end, the rear end is located outside of a refill 7 in the radial direction. The boundary line 47 of a tapered part 43 and a shoulder 44 is located on the taper surface 49 of a chip 23 in the radial direction of a point tube 5. COPYRIGHT: (C)2008,JPO&INPIT
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