Drilling tool especially for the rotary percussion drilling of preferably rock
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
Nov 5, 1998
filing date -
Nov 6, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A drilling tool, especially for the rotary percussion drilling of preferably rock, has a drilling body equipped toward the drilling side preferably with cutting bits, and with an axially arranged bore for receiving an exchangeable centering drill. In order to achieve axial movability and a reliable rotational takeup of the centering drill in the drilling tool, the drilling tool has a transverse bore which is arranged centrally relative to its drill longitudinal axis and into which can be inserted a bar-shaped or tubular holding means which centrally penetrates a corresponding recess on the shank of the centering drill so that the centering drill can be moved in the axial direction.
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