Bit of circular cross-section

Details Bit of circular cross-section Bit of circular cross-section

1977-04-13

1979-07-03

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175410, 299 86, E21B 908

Patent

active

041597460

ABSTRACT:
A cutting bit includes a bit tip and a shaft having a portion tapered toward the tip and having a reduced diameter between the tapered portion and the portion intended to be inserted in a holder. The bit tip has the shape of a body of revolution with convex generatrices.

REFERENCES:
patent: 3258077 (1966-06-01), Phipps
patent: 3493268 (1970-02-01), Bower, Jr.
patent: 3603414 (1972-01-01), Stebley
patent: 3650565 (1972-03-01), Kniff
patent: 3870370 (1975-03-01), Winberg
patent: 3957307 (1976-05-01), Varda

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