| 摘要 |
PROBLEM TO BE SOLVED: To provide a double-headed ball point pen using two ball point pen refills for packing a shear-thinning ink and a grease-like follower in an ink housing cylinder which is inexpensive and suitable for mass production by simplifying its assembled structure. SOLUTION: In a ball point pen, a ball point pen chip 7 holding a ball freely rotatably is arranged at the tip of an ink housing cylinder 4. A shear-thinning ink 9 and a grease-like follower 10 which follows with the consumption of the ink 9 are packed in the cylinder 4. A notch part 11 is formed in the rear end surface of the cylinder 4, and ball point pen refills 2, 3 are arranged in a shaft cylinder to make their rear end surfaces face each other. The notch part 11 is made an air passage part 12 which makes the inside and outside of each cylinder 4 of the refills 2, 3 communicate with each other. |
