Hammer drills for making boreholes

Details Hammer drills for making boreholes Hammer drills for making boreholes

1990-03-01

1992-05-26

Dang, Hoang C.

Boring or penetrating the earth

With below-ground tool drive prime mover

173 78, 173 80, 173136, 173138, 175296, E21B 414

Patent

active

051158752

ABSTRACT:
A valveless-type down-the-hole hammer drill which has an inner tube extending from the upper end of the hammer body into a central opening in a cutter bit reciprocably mounted in a chuck on the opposite end of the hammer body. High pressure fluid is supplied to the interior of the inner tube and a piston surrounding the inner tube has internal surfaces controlling connection of a port to chambers above and below the piston. The external surface of the piston controls connection of these chambers to an exhaust port. A valve sleeve on the chuck coacts with the piston in this respect.

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