Rock drill bit

Details Rock drill bit Rock drill bit

2008-07-01

2008-07-01

Tsay, Frank S (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S417000

Reexamination Certificate

active

07392863

ABSTRACT:
The present invention relates to a rock drill bit for percussive drilling. The drill bit comprises a bit body; a head portion defining a longitudinal center axis. The head portion comprises a front face having an outer surface portion, and an inner surface portion disposed radially inside of the outer surface portion. The inner surface portion is partially recessed by a cavity with respect to the outer surface portion. A plurality of fluid channels extends through the head portion and communicates with the cavity for conducting a flushing medium thereto. The inner surface portion comprises a raised portion carrying a plurality of buttons. An imaginary circle intersects centers of the fluid channels and also intersects an equal number of buttons.

REFERENCES:
patent: 3955635 (1976-05-01), Skidmore
patent: 4299298 (1981-11-01), McEnery et al.
patent: 4598779 (1986-07-01), Liljekvist et al.
patent: 4819756 (1989-04-01), Krude
patent: 4940097 (1990-07-01), Martini
patent: 5029657 (1991-07-01), Mahar et al.
patent: 5595252 (1997-01-01), O'Hanlon
patent: 5794728 (1998-08-01), Palmberg
patent: 5890551 (1999-04-01), Liljebrand et al.
patent: 2004/0065482 (2004-04-01), Larsson
patent: 520036 (2003-05-01), None

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