Fluid drilling head with sliding gauging ring
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United States of America Patent
Stats
-
Dec 27, 2016
Grant Date -
Jan 2, 2014
app pub date -
Feb 23, 2012
filing date -
Feb 25, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A fluid drilling head for drilling a bore hole through rock. The fluid drilling head has a rotatable nozzle assembly incorporating a plurality of nozzles arranged to form fluid jets when provided with a supply of drilling fluid under pressure. The fluid jets include pilot jets directed in the general direction of movement of the drilling head and reaming jets directed generally radially and arranged to enlarge the initial hole formed by the pilot jets. A gauging ring is located behind the cutting head and sized to the intended diameter of the bore hole. The gauging ring is arranged to slide axially relative to the rotating cutting head between a rearward position where the reaming jets are exposed, and a forward position where some or all of the reaming jets are shrouded by the gauging ring and inhibited from enlarging the diameter of the bore hole.
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Cited Art Landscape
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