Boring or penetrating the earth – Boring without earth removal
Patent
1995-06-05
1996-09-10
Bagnell, David J.
Boring or penetrating the earth
Boring without earth removal
1753256, 1753257, 175407, E21B 728
Patent
active
055536760
ABSTRACT:
Several designs of reversible expanders (10, 50, 100, 150) are disclosed for use on an underground boring tool (14) of the type using an air impact hammer. The reversible expanders allow a borehole of larger diameter than the tool to be formed. The reversible expander (10) is interference fit on the outer surface of the boring tool by either pressing the expander onto the tool or by shrink fit. A reversible expander (50) has a split which allows the expander to be slid over the tool and then clamped in place by bolts. A reverse expander (100) is formed of two members (102, 104) which, when bolted together, form a taper lock engagement with the tool. Finally, a reversible expander (150) can be threaded onto threads on the outer surface of the tool.
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Self Kelvin P.
Wilson Dirk A.
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