Hard material bit

Details Hard material bit Hard material bit

2007-04-25

2009-06-23

Neuder, William P (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S435000

Reexamination Certificate

active

07549491

ABSTRACT:
A hard material bit for a rotary-percussion tool (2) includes at least one cutting edge (3), a bottom surface (6) located opposite the at least one cutting edge (3), and at least one attachment surface (8) and at least one free surface (10) both extending transverse to the bottom surface (6) and forming, respectively, a piecewise extending first chamfer (9a) and second chamfer (9b), with the second chamfer (9b) having a width greater than a width of the first chamfer (9a).

REFERENCES:
patent: 5375672 (1994-12-01), Peay et al.
patent: 2001/0013430 (2001-08-01), Hauptmann et al.

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