Hole digging apparatus and method

Details Hole digging apparatus and method Hole digging apparatus and method

1980-02-25

1982-04-06

Pate, III, William F.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by longitudinally relatively movable...

175173, E21B 1032

Patent

active

043231292

ABSTRACT:
Cables attached to a rotating Kelly nut of a drill rig serve to maintain the vertical level of pivot points of bell-cutting blades while the blades are swung outwardly about these stationary pivot points to cut a bell for a drilled hole. The bell cuttings gravitate to the bottom of the drilled hole which is disposed a predetermined distance below the location of the bell.

REFERENCES:
patent: 964680 (1908-11-01), Burrows
patent: 1970063 (1934-08-01), Steinman
patent: 2836396 (1958-05-01), Rawlinson, Sr.
patent: 3336989 (1967-08-01), Henderson
patent: 3379266 (1968-04-01), Fletcher

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