Stressed relieved bit leg for an earth boring bit

Details Stressed relieved bit leg for an earth boring bit Stressed relieved bit leg for an earth boring bit

1981-02-18

1984-02-14

Pate, III, William F.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175331, E21B 1008

Patent

active

044310668

ABSTRACT:
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.

REFERENCES:
patent: 3739864 (1973-06-01), Cason, Jr.
patent: 4077428 (1978-03-01), Ioannesian

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