Boring or penetrating the earth – Processes
Patent
1994-06-08
1997-01-07
Dang, Hoang C.
Boring or penetrating the earth
Processes
175292, 175385, 175406, E21B 728
Patent
active
055907245
ABSTRACT:
An underreamer which may be mounted on a core drill to allow single phase underreaming or creation of a bore hole of larger diameter beneath a pilot hole. A plurality of levers are powered by a plurality of corresponding jacks which are adapted to exert pressure on the levers in order to cause them to extend beyond the periphery of the expander body. Each lever contains at least one roller-cutter rotatably mounted to the lever so that when the levers are forced outward, the roller-cutters crush rock beyond the periphery of the expander body and thus underream the bore hole.
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One sheet of drawing comprising FIGS. 1-5, document No. 175-308, Nortensen Christeian Gasper inventor (1874).
Dang Hoang C.
Ewing, IV, Esq. James L.
Russian-American Technology Alliance, Inc.
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