Drill bit and cutter element having chisel crest with...

Details Drill bit and cutter element having chisel crest with... Drill bit and cutter element having chisel crest with...

2011-05-31

2011-05-31

Wright, Giovanna C (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

C175S374000, C175S378000, C175S398000, C175S420000, C175S431000

Reexamination Certificate

active

07950476

ABSTRACT:
A rolling cone drill bit includes a cutter element having a cutting portion with a chisel crest and a pilot portion extending beyond the chisel crest. The pilot portion includes a cutting surface that may be generally conical, or form a second chisel crest. The cutting tip of the pilot portion is supported by buttress portions which emerge from and extend beyond the flanks of the chisel crest to provide additional strength and support for the material of the pilot portion that extends beyond the height of the chisel crest.

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