| 摘要 |
PROBLEM TO BE SOLVED: To prevent the backlash in a block body. SOLUTION: A mounting piece 3 is inserted into a fitting section 9 of a block body 1, an engagement section 18 is engaged to an engagement projection 15, and a block body 1 is mounted. The engagement section 18 is engaged to the engagement projection 15 at least at two places on a straight line that is extended along the longitudinal direction of the block body 1, thus preventing the backlash in the longitudinal direction of the block body 1. Additionally, the engagement section 18 is engaged to the engagement projection 15 at one or two places that are alienated from the straight line, thus preventing the backlash in the widthwise direction that nearly orthogonally crosses the longitudinal direction of the block body 1.
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