| 摘要 |
PROBLEM TO BE SOLVED: To improve the strength of the upper part hinge block and the lower part hinge block, and by extension, the strength of a hinge part compared with a conventional cylindrical part by composing the upper part hinge block and the lower hinge block of a semi-circular column part which is connected to a triangular prism part and the triangular prism part. SOLUTION: In a hinge structure, the upper part hinge block h1 and the lower part hinge block h2 comprise triangular prism parts h1b, h2b and semi-circular column parts h1c, h2c which are connected to the triangular prism parts. A hinge pin 5 is mounted through horizontal holes h1a and h2a which are bored in the upper part hinge block and the lower part hinge block.
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