| 摘要 |
PROBLEM TO BE SOLVED: To satisfy performance of ink direct flow and reverse flow or the like and to reduce a cost by upgrading a ballpoint pen having a relatively large diameter tip ball using a low viscosity ink. SOLUTION: A tip 1 has a step part 4b formed on a rear end bore of a rear barrel 4 of a resin molding. A cutout 4d of a suitable length is formed at a predetermined position from a rear end at the barrel 4. A spring 3 is inserted into the bore of the tip 1 from a rear end of the barrel. A rear end of the spring 3 is locked to the part 4b so as to inhibit its removal. A tip ball 2 rotatably embraced by the tip end is brought into close contact with an inner edge of a ball embracing part 1a of the tip 1 by a pressing force of the spring 3 to prevent ink from being flowed out. |
