Multi-shaft drilling unit
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United States of America Patent
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-
Aug 25, 1998
Grant Date -
N/A
app pub date -
Mar 5, 1997
filing date -
Oct 22, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
At least one guide shaft is equipped on one or both sides of a plurality of drilling shafts arranged on a line; and a jet nozzle is equipped with said guide shaft. A multi-shaft drilling unit, equipped with preferably three auger shafts, is used to develop a continuous wall under the ground. In such a unit, a housing for maintaining a pitch between the auger shafts includes a housing comprising: a primary gear rotating around the central auger shaft; a pair of secondary gears engaging with the primary gear; a primary bevel gear integral to the primary gear; a secondary bevel gear engaging with said primary bevel gear and fixed to a rotary shaft which rotary shaft is perpendicular to a straight line connecting the center lines of auger shafts; and cutters fixed at both ends of the rotary shaft.
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