Drill bit

Details Drill bit Drill bit

2007-06-19

2007-06-19

Bates, Zakiya W. (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S395000, C175S430000

Reexamination Certificate

active

11253603

ABSTRACT:
A drill bit has, on its face, a combination of at least one straight cutting edge and at least two curved cutting edges arranged in a Y-shape. The cutting edges on the face of the drill bit are arranged such that they start from the axis of the drill bit or end directly adjacent thereto. The straight cutting edge is symmetrical with respect to the curved cutting edges, which are curved in opposite directions.

REFERENCES:
patent: 3997279 (1976-12-01), Porter
patent: 4185708 (1980-01-01), Janikowska-Pawlik et al.
patent: 5810517 (1998-09-01), Bostic
patent: 001 513 (1997-06-01), None
patent: 918 741 (1954-10-01), None

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