| 摘要 |
PROBLEM TO BE SOLVED: To prevent the direct flow and back flow of ink, and writing scratch in the case of upward writing, and after impact. SOLUTION: In a ball point pen in which the tip 11 of the pen is fixed at the end, a valve chamber 8 in which a ball valve 10 is engaged loosely is fixed behind the tip 11, water base ink having so-called shear-reduced viscosity which is basically of low viscosity and discharged with the viscosity reduced by the rotation of a tip ball 12 during writing or oil base ink 22 of low viscosity is provided behind the valve chamber 8, and a follower which moves with the consumption of ink associated with writing is fitted behind the ink 22, a spring 16 is inserted into a tip inner hole 13, the rear part of the spring 16 is fixed to the tip 11, the rear end of the spring is formed to project from the rear end of the tip, in front of the spring 16, the tip ball 12 which pushes the rear end of the tip ball 12 which is held freely rotatably at the end part of the tip is contacted closely with the inner fringe of the ball holding part of the tip, the ball valve 10 contacts the rear end of the spring 16 with the tip 11 directed downward. |
