Earth boring auger

Details Earth boring auger Earth boring auger

1975-12-15

1976-12-21

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175351, 175394, E21B 924

Patent

active

039982823

ABSTRACT:
An earth boring auger having a shaft and helical flights thereon and a plurality of disc cutters mounted below the flights and behind the leading edge thereof to engage the formation before it is engaged by the flights.

REFERENCES:
patent: 850533 (1907-04-01), Litaker
patent: 893950 (1908-07-01), Thomas
patent: 1136203 (1915-04-01), Bardeen
patent: 1640644 (1927-08-01), Bullum
patent: 1719546 (1929-07-01), Hallett
patent: 2380112 (1945-07-01), Kinnear
patent: 2823025 (1958-02-01), Biedess
patent: 3094179 (1963-06-01), Lines
patent: 3905432 (1975-09-01), Mullins

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