Earth auger drill

Details Earth auger drill Earth auger drill

1975-06-23

1976-12-07

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175394, 175397, E21B 922

Patent

active

039957063

ABSTRACT:
A drill of the type comprising a pilot point for locating the drill in a medium to be drilled and cutting means extending from the pilot point and having a radially outermost portion which defines the radius of the hole to be drilled and which precedes a radially inner portion into the medium both axially and radially to promote fracture of the medium laterally of the direction of drilling and thereby to facilitate drill penetration into the medium.

REFERENCES:
patent: 715657 (1902-12-01), Griffiths
patent: 1961390 (1934-06-01), Ragsdale
patent: 2736542 (1956-02-01), Cartlidge
patent: 2749104 (1956-06-01), Barrett
patent: 2776123 (1957-01-01), Snyder
patent: 3074703 (1963-01-01), Adams et al.
patent: 3095053 (1963-06-01), Pistole et al.
patent: 3175630 (1965-03-01), Hein et al.
patent: 3235018 (1966-02-01), Troeppl

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