Core bit having axial conical core breaker

Details Core bit having axial conical core breaker Core bit having axial conical core breaker

1978-03-31

1980-06-17

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175391, 175404, E21B 916

Patent

active

042079543

ABSTRACT:
A drilling tool comprising a body having a leading face with a central recess providing the body with an annular leading cutting edge such that during drilling a central core is formed, and a central cone positioned axially in the recess for breaking up the core.

REFERENCES:
patent: 2731236 (1956-01-01), Bruce
patent: 2738166 (1956-03-01), Koch
patent: 2975849 (1961-03-01), Stuart
patent: 3055443 (1962-09-01), Edwards
patent: 3112800 (1963-12-01), Bobo
patent: 3158216 (1964-11-01), Baron et al.
patent: 3768581 (1973-10-01), Rederon
patent: 3845830 (1974-11-01), Fowler et al.
patent: 3861478 (1975-01-01), Condolios et al.

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