Stressed relieved bit leg for an earth boring bit
Patent
·
OSTI ID:6633440
An earth boring bit has features to reduce stress concentration. The earth boring bit is of the type having three bit legs, each bit leg having a depending bearing pin for rotatably carrying a cutter. An annular fillet is formed at the junction of the bearing pin and the bit leg for receiving a seal ring. To relieve stress above the fillet and on the inside surface of the bit leg, a depression is formed. The depression is formed in the inside surface of the bit leg with a lower edge commencing at the top of the fillet. The depression is curved in vertical cross-section and is located behind the backface of the cutter.
- Assignee:
- Hughes Tool Company
- Patent Number(s):
- US 4431066
- OSTI ID:
- 6633440
- Country of Publication:
- United States
- Language:
- English
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