| 摘要 |
PROBLEM TO BE SOLVED: To provide a percussion device which is easily placed to an earth auger without burden, does not use oil pressure or pressure air, performs auger work to use continuous precessions jointly, improves work efficiency in press- fitting steel pipes and rails by rotation press-fitting, reduces percussion sound, and performs manufacturing or construction at low cost. SOLUTION: The rotating force of the earth auger is used to elevate and drop a hammer, and the tensile force effect of a coil spring is used to generate a strong percussion force.
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