| 摘要 |
It comprises a striking plunger 13, a point or boring tool 14 pushed by said striking plunger 13, a plurality of sleeves 10, 11, 12 mounted, also, inside the body 9 for the sliding of the plunger 13 and of the point or boring tool 14, a gas cushion 15 located in the rear part of the plunger 13 and a hydraulic distributor device 16 so that the hydraulic fluid generates withdrawal of the plunger 1, 13, the plunger 13 acting on the point or boring tool 14 through the action of the cushion 15 which has previously been compressed by the hydraulic fluid. It is characterized in that the body 9 which contains the plurality of sleeves 10, 11, 12 comprises a single piece 9a for supporting the sleeves 10, 11, 12 and a rear cover 9b. Defects of alignment are avoided and accidental breakages reduced. <IMAGE>
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