Boring tool
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 9, 1998
Grant Date -
N/A
app pub date -
Apr 1, 1996
filing date -
Apr 1, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
A boring tool with two driving heads which are used to sink a casing string and a borer string includes a controllable coupling mechanism fitted between the two driving heads. A mechanism is also provided for the lower driving head, such that the driving head is subjected to an additional downwards acting force. When both driving heads are coupled, the upper driving head is also subjected to an additional, downwards acting vertical force. In order to free the top end of the casing string, the coupling mechanism can be released so that the upper driving head can be fully raised, whilst the lower driving head remains in position adjacent to the ground.
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