Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Reexamination Certificate
2005-08-16
2005-08-16
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by fluid pressure
C175S269000, C175S290000, C175S325200
Reexamination Certificate
active
06929076
ABSTRACT:
A bore hole underreamer is provided having a hollow body with a longitudinal axis, which has an external wall, at least two cylindrical bores provided through the external wall and whose axes are transverse to the longitudinal axis. Each of the bores have a cylindrical widening arm for widening the hole, which is arranged in the bore like a hydraulic piston, so as to be able to slide therein between an active position and an inactive position. The underreamer has a locking member which can occupy a locking position in which this member locks the arms in their inactive position, and which, when it is released, can leave the locking position under a thrust from at least one of the arms subjected to the pressure capable of pushing the arm into its active position.
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Fanuel Philippe
Lassoie Jean-Pierre
Moi Stein Erik
Smith Clint
Baker & Botts L.L.P.
Dang Hoang
Security DBS NV/SA
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