Borehole drilling apparatus

Details Borehole drilling apparatus Borehole drilling apparatus

1976-02-09

1977-06-28

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

With above-ground means

175215, 277119, E21B 106, E21B 2100

Patent

active

040319709

ABSTRACT:
A borehole drilling apparatus having a pneumatically driven hammer mounting a bit, a drill pipe connected to the hammer to supply operating compressed air to drive the hammer and to blow drilling debris therefrom, and a debris conduit in spaced circumscribing relation to the drill pipe having an open end adjacent to the hammer to receive air and debris therefrom and a remote opposite end to discharge said air and debris through the conduit.

REFERENCES:
patent: 1862260 (1932-06-01), Edmunds
patent: 2692152 (1954-10-01), Tremolada
patent: 2764387 (1956-09-01), Dionisotti
patent: 2896980 (1959-07-01), Dicky
patent: 2914306 (1959-11-01), Failing
patent: 3151690 (1964-10-01), Grable
patent: 3297100 (1967-01-01), Crews
patent: 3393740 (1968-07-01), Seese et al.
patent: 3638742 (1972-02-01), Wallace
patent: 3655001 (1972-04-01), Hoffman

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