Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1977-04-01
1978-08-22
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175376, 175410, E21B 936
Patent
active
041082605
ABSTRACT:
A specially shaped insert of the type used for the cutter teeth of rock bits used in drilling soft and medium formations of the earth. The insert is generally chisel-shaped with flanks converging to a crest. The flanks are asymmetrical with respect to each other. The leading flank is scoop-shaped and the trailing flank is rounded outwardly.
REFERENCES:
patent: 1859717 (1932-05-01), Rutrle
patent: 3388757 (1968-06-01), Fittinger
patent: 3743038 (1973-07-01), Bennett
patent: 4006788 (1977-02-01), Garner
Felsman Robert A.
Hughes Tool Company
Pate III William F.
Purser Ernest R.
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