Mining drill

Details Mining drill Mining drill

1982-02-08

1984-01-24

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175410, 403348, E21B 1062

Patent

active

044270828

ABSTRACT:
In a mine tool of the type having a drive body holding a bit, the bit and drive body include complimentary and mating surfaces wherein one pair of surfaces are adapted to be in overlapping relationship when the bit is twisted in a direction opposite the rotational direction for detachably mounting the bit to the drive body.

REFERENCES:
patent: 1130726 (1915-03-01), Greve
patent: 1171380 (1916-02-01), Arthur
patent: 3032129 (1962-05-01), Fletcher et al.
patent: 3434552 (1969-03-01), Bower, Jr.
patent: 4165790 (1979-08-01), Emmerich

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