PDC cutter and bit
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United States of America Patent
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-
Sep 3, 1985
Grant Date -
N/A
app pub date -
Feb 22, 1983
filing date -
Feb 22, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention comprises a drag-type drill bit and a cutting member therefor. Each of the cutting members comprises a stud having a shank adjacent one end mounted in a respective bore in the bit body and a head adjacent the opposite end projecting outwardly from the bit body. The head has a lip formation adjacent the juncture of the head and shank. The lip extends laterally outwardly with respect to the shank to overly the outer surface of the bit body adjacent the respective bore. The cutting face is concave, presenting a plurality of different back rake angles, which angles increase with distance from the lip formation.
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