| 摘要 |
PROBLEM TO BE SOLVED: To provide a core vent eliminating troublesomeness of combining two or more parts not only to simplify a structure but also to prevent water accumulated on the rear surface of a mold from penetrating in the mold. SOLUTION: A columnar body 1 becoming the core vent inserted in the through-hole of a mold is formed so as to become longer than the thickness of the mold. One end surface among both end surfaces 2, 3 of the columnar body 1 is positioned on the inner surface side of the mold, and the other end surface 3 is positioned so as to protrude from the outer surface 24 of the mold. The side surface part 5 of the columnar body is partially exposed to the outside of the mold, and passing grooves 4 opened from one end surface 2 on the inner surface side of the mold to the side surface part 5 exposed on the outer surface side of the mold, and having length not reaching the other and surface 3, are formed to the columnar body 1 to allow the inside and outside of the mold to communicate with each other. |
