Drilling tool for the air-lifting process
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United States of America Patent
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-
Jun 18, 2002
Grant Date -
N/A
app pub date -
Oct 10, 2000
filing date -
Jul 2, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drilling tool for drilling bore holes into the ground and for removing the drilled material using an air-lifting process. The drilling tool has a drilling head equipped at its lower surface with curing elements, whose upper surface is connected to hollow drilling rods having an inner conveying channel and from whose lower surface boring material mixed with a rinsing liquid is removed via the conveying channel. At the lower surface of the drilling tool head, inside a radial channel connected to the conveying channel, a cross-flow of the rinsing liquid, flowing radially inwards and having a high flow velocity, is produced for the purpose of carrying along the boring material.
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