Drilling device
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United States of America Patent
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-
Dec 7, 1999
Grant Date -
N/A
app pub date -
Jan 12, 1998
filing date -
Mar 31, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drilling device has a frame (1) with a feed device (2) for carrying a drilling device (3) movable to-and-fro for rotating a drill string (4). The drilling device includes a sensor (6) for sensing an end (7) of a drill string element (8) in the drill string (4), and a register for the position of the end (7) along the feed device (2) and for the displacement of the drilling device (3) along the feed device (2).
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