Directional drilling tool
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 4, 2002
Grant Date -
N/A
app pub date -
Jun 14, 2000
filing date -
Oct 15, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary-percussion device for directional drilling in rock comprises a substantially cylindrical, rotatable body portion (15) housing a percussion hammer, and a frustroconical head (2) eccentrically mounted on the front of the body portion. The minimum diameter face (3) of the head is adjacent to the body portion. The axis (6) of the head is parallel to but offset from the axis (5) of the body. The front face (4) of the head is chisel-shaped and comprises at least one oblique plane (11) sloping forwardly in the same direction as the offset of the head axis relative to the body axis.
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