Drill blades for drill bit

Details Drill blades for drill bit Drill blades for drill bit

2005-11-29

2005-11-29

Tsay, Frank S (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S427000, C175S430000

Reexamination Certificate

active

06968912

ABSTRACT:
A drill bit consists of a bit body having a forward end and a slot in the forward end to hold a hardened cutting blade. The blade has a central slot extending into the forward end thereof such that the slot defines inner side wails and a bridge extending between the inner side walls. A protrusion along the leading face of each of the cutting sides of the blade with each protrusion extending to the forward edge extends the length of the cutting edges and by distributing the load along a greater length reduces the stress to the cutting edge. Protrusions along the trailing face of the blade also extern to the cutting edge and increase the strength of the blade.

REFERENCES:
patent: 3878905 (1975-04-01), Schaumann
patent: 5025873 (1991-06-01), Cerkovnik
patent: 5287937 (1994-02-01), Sollami et al.
patent: 5458210 (1995-10-01), Sollami
patent: 6401844 (2002-06-01), Doster et al.
patent: 6547017 (2003-04-01), Vail, III

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