Under-reaming pile bore excavator

Details Under-reaming pile bore excavator Under-reaming pile bore excavator

1981-06-26

1983-10-04

Novosad, Stephen J.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

175283, 175284, 175288, E21B 728, E21B 1032

Patent

active

044073763

ABSTRACT:
An under-reaming pile bore excavator by which a straight pile bore is first excavated vertically to a given depth by rotating the main drill bits and the under-reamed bore is next excavated downward and outward into a given shape by rotating the slidable wing bits, allowing a relatively larger diameter ratio of the under-reamed pile bore to the straight pile bore. The under reamed pile bore excavator of the present invention comprises a plurality of guide rails disposed so as to cross the axis of the drill pipe, and a plurality of slidable wing bits mounted on the guide rails which excavate the under-reamed bore, in addition to the conventional main drill bits which can excavate the straight pile bore.

REFERENCES:
patent: 1132062 (1915-03-01), Bardeen
patent: 1621812 (1927-03-01), Ross
patent: 1778442 (1930-10-01), York
patent: 1786484 (1930-12-01), Duda
patent: 2826077 (1958-03-01), Walker
patent: 3680647 (1972-08-01), Dixon et al.

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