| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an automatic hammer capable of restraining a damage onto a mold, even when used for a concrete compaction, to prevent the mold from being broken. Ž<P>SOLUTION: This automatic hammer includes a hammer body 1 built in with a vibration source driven electrically or by compressed air, and a bit 2 attached to the hammer body 1, vibrated by the vibration source, and for bringing a distal end into contact with an object to apply an impact, and is provided with a cushioning material 24 for moderating the impact in a bit distal end 22. The impact applied onto the mold is moderated by the cushioning material 24, when the distal end of the bit 2 is brought into contact with the mold, for the compaction of concrete, and the mold is thereby prevented from being broken by an excessive impact. The mold is prevented from being broken, to enhance the quality of the concrete for reuse the mold. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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