Boring or penetrating the earth – Processes
Reexamination Certificate
2007-04-03
2007-04-03
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Processes
C175S381000, C175S385000, C175S404000
Reexamination Certificate
active
11306022
ABSTRACT:
In one aspect of the present invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has at least one cutting element and the body portion has at least a portion of a jackleg apparatus. The jackleg apparatus has at least a portion of a shaft disposed within a chamber; the shaft has a distal end. The jackleg apparatus has a hydraulic compartment adapted to displace the distal end of the shaft relative to the working portion. The chamber also has an opening proximate the working portion of the assembly. The hydraulic compartment may be part of a hydraulic circuit which has a pump. The pump may have a first section with is rotationally fixed to the body portion and a second section rotationally isolated from the body portion.
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Dahlgren Scott S.
Hall David R.
Leany Francis E.
Dang Hoang
Wilde Tyson J.
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