| 摘要 |
A hammer (90) is supported in a valving sleeve (82) fixed in an internal passageway (27) of a body (25). The sleeve has a cross wall (81) with an orifice (120) closed and opened by the hammer (90) on one side and a tubular reciprocable valve (60). An annular chamber (58) is formed around the reciprocable valve (60). A piston (51) is mounted in the annular chamber forming a pressurized gas chamber (58) on one side and a high pressure hydraulic oil chamber (75) on the other side. When hydraulic oil is introduc ed into the oil chamber (75), the reciprocable valve (60) will close the orific e (120) and as the piston (51) moves to compress the gas in the gas chamber (58), it moves the reciprocable valve (60) away from the orifice (120). The high pressure oil discharges against the hammer (90), which strikes a striki ng tool (102).
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