| 摘要 |
PROBLEM TO BE SOLVED: To provide an ejection-type ball-point pen with a rotary cam-actuated refill feed mechanism with such features that two different kinds of ball-point pen refills with different outside diameter sizes, housing ink reservoir tubes of the same overall length can be arranged and the lop-sized wear of a ball-point pen tip is prevented from occurring and further, an ink leakage and an ink supply failure hardly occur. SOLUTION: In this ejection-type ball-point pen equipped with a rotary cam-actuated refill feed mechanism, the rotary cam is formed in a cylindrical shape with an open apex and a bottomed rear end and also has a protrusion extending toward the opening, formed on the inner wall face of the bottom. In addition, a ball-point pen refill is retained by forcing the rear end of the first ball-point pen refill into the rotary cam and bringing the rear end face into contact with the inner wall face of the bottom of the rotary cam. Further, a second ball-point pen refill is retained by forcibly fitting the protrusion into the rear end of the second ball-point refill and bringing the rear end face into contact with the inner wall face of the bottom of the rotary cam. Thus, the two different kinds of the ball-point pen refills are rotated by an intermeshing action with the rotary cam. |
