Mounting means for cutting elements in drag type rotary drill bit
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United States of America Patent
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May 16, 1989
Issued Date -
N/A
app pub date -
Jun 12, 1987
filing date -
Feb 18, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A drag type rotary drill bit (10) having mounted on its lower face (22) a rigid integral holder (30) for a plurality of polycrystalline diamond compact (PDC) cutting elements (42) secured to a planar face (60) of the holder (30). An upper projecting tapered end portion (71) of the holder (30) defines tapered surfaces (72, 73) with the lower tapered surface (72) extending at a relatively large clearance angle (B) to provide a relatively small wear flat surface on the holder (30).
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