Percussion drill bit having centrally projecting insert

Details Percussion drill bit having centrally projecting insert Percussion drill bit having centrally projecting insert

1980-01-11

1981-12-08

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Nonsymmetrical bit

175410, E21B 1308

Patent

active

043043127

ABSTRACT:
A percussion drill bit comprises a bit body including a shaft having a conical mounting portion to be mated with a conical mounting portion of a drill rod by means of substantially longitudinal friction forces. An annular row of circumferentially spaced button inserts extend from a front face of the body. A central button insert is disposed centrally of the other inserts and extends axially from the front face of the body beyond the other inserts to define a pilot insert. The outer inserts are inclined at an angle relative to the longitudinal axis of the body. A centrally located flushing channel is provided in the drill rod.

REFERENCES:
patent: 2725216 (1955-11-01), Brown
patent: 2759705 (1956-08-01), Bjorkman
patent: 3004767 (1961-10-01), Greene et al.
patent: 3100545 (1963-08-01), Zimmerman
patent: 3185228 (1965-05-01), Kelly, Jr.
patent: 3258077 (1966-06-01), Phipps
patent: 3357507 (1967-12-01), Stewart
patent: 3519092 (1970-07-01), Miller
patent: 3800892 (1974-04-01), Fischer
patent: 3997011 (1976-12-01), Staroba

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