Drill bit with a fixed cutting structure

Details Drill bit with a fixed cutting structure Drill bit with a fixed cutting structure

2005-02-23

2009-11-24

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

Bit or bit element

With fluid conduit lining or element

C175S426000, C175S430000, C175S431000, C175S432000, C175S434000

Reexamination Certificate

active

07621349

ABSTRACT:
The invention concerns a drill bit (1) with stationary cutting structure, comprising a tool body (2) and several blades (3), which consist of a metal matrix impregnated with abrasive particles, and which are fixed to the tool body while extending forward therefrom, said blades (3) forming jointly a front cutting surface (7), and having radial channels (4) for drilling fluid which mutually separate the blades (3) and are open outwards. The invention is characterized in that it further comprises, through at least one radial fluid channel (2) arranged between two said blades (3), at least one bridge (6, 6′, 6″) which connects said two blades, by being arranged between the tool body (2) and said front cutting surface (7).

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U.S. Appl. No. 60/644,369, filed Jan. 2005, Lapointe, Paul-Philippe.
International Search Report for Application No. PCT/BE2005/000028 (6 pages), Oct. 13, 2005.

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