Boring apparatus with coupling for rapid connection of drill string segments
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United States of America Patent
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-
Jul 31, 2001
Grant Date -
N/A
app pub date -
Jun 16, 1998
filing date -
Jun 17, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
In apparatus for producing and expanding earth boreholes and for destroying and replacing underground pipelines or for driving in pipes, a feed drive and a rotary drive having a plug-in coupling comprising a chuck and a locking portion at the end of a string is located in a frame. The string comprises a plurality of sections or lengths having an internal screw thread at one end and an external screw thread on the locking portion at the other end, which at the same time is provided with a key face to hold fast said string section while it is screwed together with the next following string section.
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