Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent
1988-04-22
1989-09-12
Dang, Hoang C.
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by fluid pressure
175228, 175368, 175370, 175371, 384 95, E21B 1034, E21B 1022
Patent
active
048651370
ABSTRACT:
An underreamer including a body having a bore therethrough, an arm mounted at its upper end to the body, a sleeve member detachably secured to the lower end of each arm and adapted to receive the frictional wear caused by the rotation of the conical cutter mounted thereto. Bearings and seals disposed between the cutter and the sleeve member provide smooth rotation of the cutter. In addition, locking pins and bearings extending between the arm and the sleeve member secure the sleeve on the arm. The arms are pivotally mounted in slots in the body and mechanical structure is provided for moving the arms to their cutting position with their lower ends positioned radially outward from the body.
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Bailey Thomas F.
Campbell John
Dang Hoang C.
Drilex Systems, Inc.
Sutherland Malcolm L.
Zarins Edgar A.
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