Impact bit having circumferential inserts of differing combinati

Details Impact bit having circumferential inserts of differing combinati Impact bit having circumferential inserts of differing combinati

1978-10-17

1980-05-13

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175374, 175393, 175415, E21C 1306

Patent

active

042024218

ABSTRACT:
A hammer drill bit has an axis, a shaft and a crown and a plurality of hard metal circumferential studs carried by the crown and distributed along a circumference thereof. Each circumferential stud has an axis inclined at an acute angle with respect to the bit axis and a conical cutting tip oriented obliquely away from the bit axis. The acute angles of the axes of consecutively viewed circumferential studs alternate between a relatively large magnitude and a relatively small magnitude differing by 10.degree. to 25.degree. from one another.

REFERENCES:
patent: 3357507 (1967-12-01), Stewart
patent: 3385385 (1968-05-01), Kucera et al.
patent: 3583504 (1971-06-01), Aallind
patent: 3726350 (1973-04-01), Pessier
patent: 4106578 (1978-08-01), Beyer

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