| 摘要 |
PURPOSE:To eliminate lack of ink and to improve resetting properties of the ink by partitioning a metal pipe to a ballpoint holder and an ink guide core container by a predetermined crest-shaped protrusion protruding toward an axial central direction. CONSTITUTION:In order to form a ballpoint pen tip, a thick pipe 1 is used, and a recess 2 is pressed and shaped in an axial central direction from three positions of an outer surface near its end. A crest-shaped protrusion 5 for partitioning the pipe into a ballpoint holder 3 and an ink guide core container 4 protruding toward an axial central direction is formed via the recess 2 in the pipe, and an end side face 5a of each protrusion 5 is formed as a ballpoint seat 3a. In this case, it is formed in a longitudinal sectional asymmetrical shape of b>a of an angle (a) of the face 5a of the holder 3 side to an angle (b) of a rear side face 5b of the container 4 side, and a weak capillary tube central ink passage 6 and a strong capillary tube slit 7 are formed oppositely via the protrusion 5. |
