Drilling machine for digging trenches in the ground

Details Drilling machine for digging trenches in the ground Drilling machine for digging trenches in the ground

1987-08-05

1989-01-31

Wiecking, David

Boring or penetrating the earth

With below-ground tool drive prime mover

Plural below-ground drive prime movers

37 94, E21B 404

Patent

active

048009679

ABSTRACT:
A drilling machine for digging trenches in the ground of the type comprising at least one substantially vertical support plate (3) on which are mounted two drilling drums (2) one one each side of it for rotation about an axis (4) substantially perpendicular to the plate.
The downwardly facing edge surfaces of said plate have portions (13) inclined relative to the direction perpendicular to said plate.

REFERENCES:
patent: 2750669 (1956-06-01), Hohmann
patent: 2895218 (1959-07-01), Petzoldt
patent: 3681863 (1972-08-01), Solntsev et al.
patent: 3894587 (1975-07-01), Sourice
patent: 4694915 (1987-09-01), Bauer et al.

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