| 摘要 |
PROBLEM TO BE SOLVED: To provide a compound knocking ballpoint pen at a low cost, whose case diameter is made narrow to the utmost, and whose case tip is made smart to the utmost, while mounting two kinds of ballpoint pen writing members simple in structure, large in size and non-deformable. SOLUTION: Ink containing pipes are filled with low-viscosity ink and grease- like followers which are disposed at a rear end of each ink and move, following the consumption of ink accompanied by writing. Further, the ink containing pipes are substantially non-deformable and are inserted into a casing 30 without swinging, and each long forward shaft portion 3 capable of being flexibly fictional is provided between a forward end of the ink containing pipe and a writing tip portion. A step is provided in the rear of a top end port of the easing 30, and return springs 39a, 39b for urging respective ballpoint pen wiring members rearwardly are disposed between the step and the forward end of the ink containing pipe. |
