| 摘要 |
PROBLEM TO BE SOLVED: To provide a cap of a writing implement of which the total length is shortened for usability. SOLUTION: In a cap wherein seal rubber 21 is retained by a top cap screw 9 fitted to a cap main body 1 and by an inner cap 22 disposed inside the cap main body 1 and the tip end 35 of a ball-point pen B is sealed with the seal rubber 21 in a state wherein the cap is fitted to the tip end 35 side of the ball- point pen B, the top cap screw 9 is provided with a recess 14 for holding the spherical seal rubber 21 and this recess 14 is constituted of a cylindrical recess 15 and a conical recess 16 which is provided in continuity to the bottom of this cylindrical recess 15. |
