Drilling tool

Details Drilling tool Drilling tool

1981-03-12

1983-10-18

Pate, III, William F.

Boring or penetrating the earth

With tool drive prime mover or above-ground mechanical...

With diversely operated shafts extending into bore

175285, E21B 728

Patent

active

044100558

ABSTRACT:
A drilling tool for drilling a cylindrical borehole of relatively great depth in a soft material and then forming a conical enlargement adjacent the bottom of the borehole includes an axially elongated tool shank with a first drill at one end for cutting the cylindrical borehole and a second drill adjacent the first drill for cutting the conical enlargement. The second drill is formed of bit holders pivotally connected to a flattened part of the tool shank. An adjustable stop is provided on the tool shank for determining the depth of the borehole. A connecting link guide located within the tool shank interengages the bit holders and the tool shank. When the desired depth is reached, due to relative axial displacement between the tool shank and the connecting link guide, the bit holders are pivoted outwardly so that the second drill can cut the conical enlargement.

REFERENCES:
patent: 1908227 (1933-05-01), Dodds
patent: 4105081 (1978-08-01), Perraud

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