| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide multi-core writing instruments in which assembling properties and refill replaceability are improved.SOLUTION: Multi-core writing instruments of the present invention are characterized as follows: a tail plug is provided with a front end attached to the rear end of an ink receiving tube and the rear end connected with an operating body or a sliding body; the rear end of the tail plug has at least a hole part with the rear end opened; a connecting part has a shaft part inserted in the hole part and a bulging part provided in the shaft part; the hole part is provided with an opening introduction part having an inner diameter larger than a circumscribed circle diameter of the bulging part, a guide part having the inner diameter larger than the circumscribed circle diameter of the bulging part and having the inner diameter smaller than the inner diameter of the opening introduction part in front of the opening introduction part, and a projection having the inner diameter smaller than the circumscribed circle diameter of the bulging part in front of the guide part; and the tail plug is removably connected with the sliding body by the jump-over fitting between the bulging part and the projection.</p> |
