Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent
1991-08-02
1992-09-08
Britts, Ramon S.
Boring or penetrating the earth
Bit or bit element
Bit with leading portion forming smaller diameter initial bore
D15139, E21B 1026
Patent
active
051450186
ABSTRACT:
A drill bit for drilling holes around the corner of a workpiece is provided with a single rounded continuous cutting edge with radiused upper and lower corners to permit free rotation of the cutting head as it is urged along an arcuate path. The bit is of a unique two piece construction permitting selective materials to be utilized in the shank an cutting head portions.
REFERENCES:
patent: 2689131 (1954-09-01), Priest
patent: 2786218 (1957-03-01), Yousem
patent: 3409965 (1968-11-01), Fisher
patent: 4131116 (1978-12-01), Hedrick
McCord, Jr. Wilfred M.
Schimke Thomas O.
Britts Ramon S.
Schoeppel Roger J.
Vermont American Corporation
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