| 摘要 |
A ballpoint pen ( 1 ) nib ( 2 ) housing the ball ( 3 ) and having a stem ( 6 ), at least one part of which is inserted coaxially into a hole ( 5 ) in the lower end ( 4 f) of a hollow barrel ( 4 ) forming part of the ballpoint pen ( 1 ). On the outer surface of the at least one part of the stem are formed one or more flutes ( 7 i) that extend parallel to the longitudinal axis (Z-Z) of the stem ( 6 ) for a length (L) equal to or greater than the axial length (H) of the hole ( 5 ) in such a way that the opposite ends (D, E) of the abovementioned flutes ( 7 i) are outside of it and on opposite sides with respect to it.
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