| 摘要 |
PCT No. PCT/SE97/00359 Sec. 371 Date Aug. 25, 1998 Sec. 102(e) Date Aug. 25, 1998 PCT Filed Mar. 4, 1997 PCT Pub. No. WO97/33723 PCT Pub. Date Sep. 18, 1997A compressed-air-operated percussion mechanism includes a housing, a percussion body and a balancing body, which form an operating chamber therebetween. A secondary valve seals the operating chamber during an operating stroke and opens the chamber to evacuate compressed air after the termination of the operating stroke. A primary valve is connected to the compressed air inlet passage and intermittently opens to provide compressed air to the operating chamber.
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