Cutting elements for rotary drill bits

Details Cutting elements for rotary drill bits Cutting elements for rotary drill bits

1987-11-05

1990-05-29

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175410, 407118, E21B 1046

Patent

active

049287770

ABSTRACT:
A cutting element, for a rotary drill bit, comprises a tablet having a front face, a rear face and a peripheral edge, at least the front face of the tablet being provided by a layer of superhard material, such as polycrystalline diamond. The peripheral edge of the tablet is formed with one or more re-entrant portions so as to define projecting cutting portions to the sides of the re-entrant portions. The element may be cut from a blank which is initially circular.

REFERENCES:
patent: 744763 (1903-11-01), Karns
patent: 1077772 (1913-11-01), Weathersby
patent: 1923488 (1933-08-01), Howard et al.
patent: 3145790 (1964-08-01), Bridwell et al.
patent: 3301339 (1967-01-01), Pennebaker, Jr.
patent: 4156329 (1979-05-01), Daniels et al.
patent: 4373593 (1983-02-01), Phaal et al.
patent: 4481016 (1984-11-01), Campbell et al.
patent: 4572713 (1986-02-01), Schmidt
"Stratapax Drill Blanks", General Electric Co., Oct. 18, 1982, 2 pages.

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