Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1988-05-20
1989-09-19
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 62, 175122, 175203, 175296, 175398, 175415, E21B 414, E21B 420, E21B 708, E21B 1036
Patent
active
048672556
ABSTRACT:
There is disclosed herein an apparatus for providing an underground tunnel utilizing a steerable pneumatically powered, elongated percussive downhole hammer having a forwardmost cutting bit which is asymmetrically configured with respect to the elongation axis of the hammer. This hammer is steered through the ground, that is, made to move along a straight path or a particular curved path, by controlling the way in which it is pneumatically powered and/or the way in which it is urged forward and/or the way in which its cutting bit is rotated.
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Baker Glen O.
Chau Albert W.
Feldman Dmitry
Mercer John E.
Ng Shiu S.
FlowMole Corporation
Novosad Stephen J.
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