"Twin-impact" double-blow drilling apparatus
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United States of America Patent
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-
Mar 20, 2001
Grant Date -
N/A
app pub date -
Apr 22, 1999
filing date -
Aug 12, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drilling apparatus 1 having a twin-impact system can work continuously with a shank end 5 is provided with a compensation ring 10 on the rotary impact side, which has a material with hardness that is lower than that of the material of the pipe and striker 8 and/or corresponding to the adjacent end portion 11 of the shank end 5 and has a shape and/or surfaces 21, 22 to compensate for the applied forces.
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