发明名称 ROCK DRILL
摘要 <p>A rock drill includes a drill shank with a boring head at one end and laterally enclosed for at least a portion of its length by a tubular shell. A helix extends around the outside of the tubular shell for carrying borings away from the boring head. Supporting members formed of a sound attenuating material are located between the helix and the other parts of the rock drill.</p>
申请公布号 CA1172626(A) 申请公布日期 1984.08.14
申请号 CA19810389952 申请日期 1981.11.12
申请人 HILTI AKTIENGESELLSCHAFT 发明人 LUTZE, UWE;SCHOLZ, DIETER;BRENNSTEINER, ERNST
分类号 B25D17/12;B25D17/11;E21B10/44;E21B17/00;E21B17/22;(IPC1-7):E21B10/44 主分类号 B25D17/12
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