Step tube rod, and drilling machine
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United States of America Patent
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N/A
Issued Date -
Jul 17, 2003
app pub date -
Nov 19, 2002
filing date -
Apr 26, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In the present invention, in a drill rod for a boring machine, a rod outside diameter is large so as to be approximately equal to a bore diameter, external threads are provided at one end and internal threads are provided at the other end, and at least one small-diameter portion is formed near an internally threaded portion. This step tube rod can reduce a bore bend. Also, for the boring machine using this step tube rod, the drill rod can be positioned easily, so that the connection and recovery work can be performed efficiently and safely.
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