Downhole drill bit and bit coupling
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 16, 1990
Grant Date -
N/A
app pub date -
Dec 15, 1989
filing date -
Dec 15, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A downhole impact drill having a drill bit head with a drill bit sector for drilling an enlarge hole upon rotation of the drill. The bit is mounted within a chuck for movement between a retracted, working position in which the bit is coaxially mounted for drilling and an extended, non-working position in which the bit is loosely mounted within the chuck to permit the bit to swing laterally to reduce the diameter of the drill bit head envelope. In its extended, non-working position, the bit is supported on the chuck at a 3.degree. angle at which the drill bit sector is positioned inwardly to facilitate installation and withdrawal of the drill.
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