Drill arrangement
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United States of America Patent
Stats
-
Nov 4, 1986
Grant Date -
N/A
app pub date -
Sep 12, 1984
filing date -
Sep 23, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to an arrangement for drilling in soil and rock while simultaneously lining the drill hole with a lining tube. The arrangement includes an asymetric guide which is non-rotatably connected to a drill stem or like element, and an eccentric drill bit or crown which is journalled for limited rotation in the guide. The guide is arranged to lie solely against a part of one side of the inner surface of the lining tube during a drilling operation. Advantageously, the guide is supplemented with a guiding portion on the shank part of the drill bit located opposite the first guide. The drill arrangement enables wide adjustments to be made to the eccentric setting of the drill bit, and makes possible an advantageous forming of the cutting geometry of the drill bit.
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Cited Art Landscape
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