Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1980-02-11
1982-06-08
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175410, E21B 1046
Patent
active
043335403
ABSTRACT:
A fixed cutting tool shape for improved rock drilling performance of drag-type rotary bits includes a cemented tungsten carbide cutter body and a plow-shaped cutter element. In a preferred embodiment, the cutter element is a composite compact of polycrystalline diamond on a cemented tungsten carbide substrate, and defines a generally V-shaped cutter to create a plowing action and direct rock ship flow away from the working surface.
REFERENCES:
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patent: 1544757 (1925-07-01), Hafford et al.
patent: 3743489 (1971-07-01), Wentorf, Jr. et al.
patent: 3745623 (1973-07-01), Wentorf, Jr. et al.
patent: 4076318 (1978-02-01), Haaschopp et al.
patent: 4110084 (1978-08-01), Lee et al.
patent: 4143920 (1979-03-01), Haddock
Cheatham, Jr. John B.
Daniels William H.
Feiler William S.
General Electric Company
Leppink James A.
Little Douglas B.
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