Abradable cutter protection

Details Abradable cutter protection Abradable cutter protection

1981-06-01

1983-08-09

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175307, 175410, E21B 1204

Patent

active

043973612

ABSTRACT:
A rotary drill bit for drilling earth formations is disclosed having a plurality of cutting elements mounted on the head portion of the bit. The bit further includes a plurality of individual protrusions projecting from the head portion more than the extension of the cutting elements. The protrusions are fabricated of a metal more readily abraded by the earth formation than any of the cutting elements. The protrusions protect the cutting elements during handling of the bit and entry of the bit into a borehole; and, the protectors are abraded away to expose the cutting elements during drilling.

REFERENCES:
patent: 2267833 (1941-12-01), McMahan
patent: 2296939 (1942-09-01), McMahan
patent: 2644672 (1953-07-01), Mathews
patent: 3788407 (1974-01-01), Lorenz et al.
patent: 4006788 (1977-02-01), Garner
patent: 4253533 (1981-03-01), Baker

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