Varied pitch rotary rock bit

Details Varied pitch rotary rock bit Varied pitch rotary rock bit

1978-05-12

1980-02-12

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175376, 175378, 175410, E21C 1302

Patent

active

041879228

ABSTRACT:
A rotary rock bit is constructed having rolling cutter members for forming a borehole in the earth. Each rolling cutter member includes an annular row of cutting elements for cutting portions of the borehole. The cutting elements comprise cutting teeth or cutting inserts. Varied pitches are provided between the inserts/teeth. The pitches between pairs of inserts/teeth are varied so that the pitches between no two pairs of inserts/teeth in a row or group are the same. Since no two pairs of inserts/teeth have the same pitch, the probability of tracking will be remote. This increases the rate at which the bit penetrates the formation and generally decreases the probability of insert/tooth breakage therein. The present invention reduces or eliminates tracking and stumbling encountered in prior art earth boring bits.

REFERENCES:
patent: 1896251 (1933-02-01), Scott
patent: 2626128 (1953-01-01), Boke
patent: 3429390 (1969-02-01), Bennett
patent: 3955635 (1976-05-01), Skidmore
patent: 4096917 (1978-06-01), Harris

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