| 摘要 |
PURPOSE:To obtain stable fixing strength with small dispersion by eliminating slip between a rod and beam at the time of hammering by providing recessed and projected shape to the hammering rod and the hammering beam. CONSTITUTION:Conical recessions 13, 14 are provided to both end faces of through holes for bolts 11, 12 at a fixing part 1A for a hammering beam of a hammering rod 1, and a projections 15, 16 fitting to the inside of said recessions are provided simultaneously to the hammering beam 2. By this connecting and fixing structure of the hammering rod to the hammering beam, a stable fixing strength is obtd.
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