| 摘要 |
PROBLEM TO BE SOLVED: To increase an ensurance about the maintenance of an air circulation through a safety cap under a simple structural design. SOLUTION: This cap 1 with a clip for a writing instrument consists of a bottomed annular groove (3) or a caved-in with a bottom formed from the closed top part centered around the center of s shaft in the axial lien direction, and an air hole 7 communicating with the annular groove (3) which is open running through the wall face of the main body of the cap 1 below a position for installing a clip 7. Thus it is possible to secure an air passage reaching the lower face of the clip from the annular groove 3 through an air hole 7 without fear about the possible blocking of the air passage and enhance the safety against an air circulation failure. Thus it is possible to prevent a molding die from becoming qualitatively deteriorated during a molding operation. |
