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US 5,957,226 AGranted
Reverse circulation drilling system with hexagonal pipe coupling
OwnerArdis L. Holteinventor
Life of this patent
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Abstract
A reverse circulation, pneumatic drilling assembly wherein the bit assembly is operatively connected to a dual wall pipe assembly. A supply of compressed air is conducted through the annulus of the dual wall pipe assembly to a down hole pneumatic hammer. Exhaust air from the down hole hammer is directed to the bit assembly for continuous removal of drilling debris through a central evacuation tube of the dual wall pipe assembly. Sections of the dual wall pipe are joined by hex head couplings which are quickly and easily engaged and disengaged.
Claims7
A pneumatic boring apparatus comprising:
- a down-hole pneumatic bit assembly;
- a first section of dual wall pipe connected to the down-hole pneumatic bit assembly;
- a second section of dual wall pipe;
- and
- a coupler joining the first and second dual wall pipe sections, the coupler comprising a first member, a second member, surfaces in each of said first and second members which define first and second bores, and first and second pins disposed in said respective first and second bores.
2 more elements
Dependencies are inferred from the claim text.