Hydro-drill with circular impression

Details Hydro-drill with circular impression Hydro-drill with circular impression

1985-12-12

1987-07-28

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

Plural below-ground drive prime movers

175122, 175391, 175413, E21B 1026

Patent

active

046826602

ABSTRACT:
The invention relates to a device for the production of circular boreholes in soil, of the type incorporating a pair of bits driven in rotation in opposite directions, the said bits being equipped with teeth or similar members for breaking up the soil.
It comprises a first pair of bits (6) which are equipped with teeth, rotating in opposite directions around two parallel axes, each of these bits having the external shape of a volume of revolution the generatrix of which consists of a circular arc corresponding to the circular cross-section of the borehole which it is intended to dig, and a second pair of bits (7) situated above the first, and the bits (14a,14b) of which have the same structural characteristics as the bits of the first pair but whose axes of rotation are offset relative to the latter.

REFERENCES:
patent: 1904522 (1933-04-01), Pippin
patent: 2360088 (1944-10-01), Walker
patent: 3322466 (1967-05-01), Mennekes
patent: 3729057 (1973-04-01), Werner
patent: 3894587 (1975-07-01), Sourice
patent: 4446935 (1984-05-01), Schumacher, Jr.

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