Means for mounting a roller cutter on a drill bit
US4991671A · kind A · utility
49Cited by
9References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1990 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Mar 13, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2352/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rotary drill bit (10) having a roller cutter (28) retained on a journal (24) by an externally threaded retainer ring (52) mounted within an annular groove (48) in the journal (24). The radii (R1, R2) formed at the inner and outer corners of the groove (48) are designed by suitable formulas to provide adequate strength for the journal (24) including the flange (50) adjacent the groove (48).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.