| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently avoid pressure increasing in an inner section of a cap when the cap is fitted and to provide a cap for writing utensils capable of suppressing reduction of the pinching force of the clip.SOLUTION: A cylinder member 62 of a head cap 6 is inserted into an annular gap between the outer peripheral surface of an inner cylinder part 4 and the inner peripheral surface of an outer cylinder part 3 to extend from a window hole 62a of the head cap 6 to a plate rib 63a. An air passage 7 is arranged between the outer peripheral surface of the cylinder member 62 and the inner peripheral surface of the outer cylinder part 3 of cap main body 2. Simultaneously, the plate rib 63a is inserted into an engaging hole 31 to create an outer hole 3a between the plate rib 63a and broad part 31a of the engaging hole 31. In a situation where a seal part 51 does not block an inner hole 41, the inner section of the cap main body 2 is communicated with outside air via the inner hole 41, the window hole 62a, the air passage 7 and an outer hole. |
