Drill apparatus having a primary drill and a pilot drill

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore

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Details

175135, 175215, 175320, 175415, 175418, E21B 1026, E21B 1036, E21B 1718

Patent

active

048526720

ABSTRACT:
Drill steel or bit apparatus includes a primary drill bit having a base and a stem, a drill tip, and a bore extending longitudinally through the base, the stem, and the tip, and a pilot drill bit having a base and a stem, and a tip, and the stem and the tip extend through the longitudinal bore in the primary drill bit. The pilot drill bit includes a longitudinally extending bore through which compressed air flows. The base of the pilot drill bit is impacted by a drill piston and the base of the pilot drill bit in turn impacts the primary drill bit. Drilling is accomplished by the tips of both the pilot drill and the primary drill bit.

REFERENCES:
patent: 1746455 (1930-02-01), Woodruff et al.
patent: 2046106 (1936-06-01), Bozeman
patent: 2080526 (1937-05-01), Bedford
patent: 2191699 (1940-02-01), Stephens
patent: 3047082 (1962-07-01), Brown
patent: 3227230 (1966-01-01), Lagerstrom
patent: 3231032 (1966-01-01), Genberg et al.
patent: 3259403 (1966-07-01), Hjalsten et al.
patent: 3613807 (1971-10-01), Gallis
patent: 3682260 (1972-08-01), Klemm

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