Drilling method and an assembly for performing the method
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United States of America Patent
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Oct 18, 1994
Grant Date -
N/A
app pub date -
Jul 7, 1993
filing date -
Nov 8, 1991
priority date (Note) -
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Abstract
The invention provides a drilling method for drilling a bore-hole in ground or soil, with a percussion drilling device operated directly in the bore-hole and with a rotary percussion drilling device operated from the surface of the ground or soil, both devices being received in a common support member and adapted to be simultaneously operated, and a drilling assembly for preforming this method. In order to avoid a damage of the percussion drilling device, the drilling impact forces and vibrations directed to the rotary percussion drilling device are registered, elastically dampened and absorbed prior to having an effect on the percussion drilling device.
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