| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the die removal and the assembly of an internal die which molds a cylindrical concrete product of which one end is closed. SOLUTION: The top board of the internal die is divided into five, a central section, and a first peripheral edge section to a fourth peripheral edge section which surround the central section. The peripheral wall is divided into four peripheral wall divided sections by corresponding to the first peripheral edge section to the fourth peripheral edge section, and a first part to a fourth part are formed by integrating respective corresponding peripheral edge sections and peripheral wall divided sections. When the central section is moved downward, and the corresponding first and second parts are moved inward and downward, the fourth and fifth parts become movable inward, and the diameter of the internal die is contracted. Thus, the cylindrical concrete product can easily be removed from the die. COPYRIGHT: (C)2008,JPO&INPIT
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