Boring or penetrating the earth – With above-ground means to advance or retract boring means
Patent
1995-07-07
1998-01-20
Tsay, Frank
Boring or penetrating the earth
With above-ground means to advance or retract boring means
175220, 173 38, E21B 1908
Patent
active
057092770
ABSTRACT:
A direction boring machine is disclosed having elongated boom carried on a utility truck along which a drill head in longitudinally moved by a drive chain. The drill head is adapted to receive a plurality of drill stems, the outermost of which carries a drill bit. The boom is split at a predetermined longitudinal point to define first and second boom sections with the first boom section mounted on the utility truck. The second boom section is connected to the first boom section through a mechanical pivot that permits the second boom section to be pivoted between an operating position in which it is co-linear with the first boom section and a transport position in which the second boom section is upwardly pivoted or folded to overlie the first boom section. The mechanical pivot defines a pivot point between the boom sections that is disposed longitudinally inward of the boom split and above the longitudinal axis of the boom.
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