Rock bit with reaming rows
This patent describes an improved roller cone rock drill bit. It comprises cone cutters; each cone cutter being rotatably mounted on journals with sliding bearing surfaces and being sealed by an elastomeric cone/journal seal; each cone cutter being further adapted to drill the bottom of a borehole; primary and secondary cutting structures being functionally effective to maintain a full gage borehole during rotary drilling; the primary cutting structure comprising a circumferential heel row of wear resistant inserts for cutting the corner of a borehole at substantially gage diameter; a gage surface adjacent to the heel row; the secondary cutting structure comprising a circumferential gage row of wear resistant gage inserts; and a clearance area between the gage surface and the gage inserts being functionally effective for chip formation, chip removal and heat dissipation.
- Assignee:
- Rock Bit International, Inc., Fort Worth, TX (United States)
- Patent Number(s):
- US 5145016; A
- Application Number:
- PPN: US 7-647849
- OSTI ID:
- 6994726
- Country of Publication:
- United States
- Language:
- English
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