| 摘要 |
PROBLEM TO BE SOLVED: To increase strength of a lifting insert by preventing force from being concentrated on a part of the lifting insert when the concrete product is lifted. SOLUTION: Protrusions (8, 18, 23 and 43), which are provided in a backmost part of the lifting insert, are fitted into recessed holes (9a and 31a) which are provided in a shaft body of the lifting member, so that the force acting at the lifting of the concrete product can be decentralized. Thus, the force is prevented from being concentrated on the part of the lifting insert, and the strength of the lifting insert is increased. COPYRIGHT: (C)2003,JPO
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