Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Reexamination Certificate
2007-01-30
2007-01-30
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
C175S418000, C175S427000
Reexamination Certificate
active
10949978
ABSTRACT:
A rotary drill bit insert that includes an elongate body that is rotatable about a central axis wherein the elongate body has a pair of symmetrical halves symmetrical about the central axis. The elongate body contains a central notch disposed between the symmetric halves of the elongate body. Each symmetrical half includes a leading face and a top surface that has a leading surface and a trailing relief surface wherein the leading surface and the trailing relief surface are contiguous and non-coplanar. Each half also has a leading cutting edge at the intersection of the leading face and the leading surface of the top surface. The leading surface is inclined at a constant angle of inclination in a radial direction with respect to a first radial line projecting from the central axis, and the leading surface being inclined downwardly and rearwardly from the leading cutting edge.
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Kennametal Catalog, “Cutting And Drilling Systems . . . For Underground and Surface Mining,” B00-023(10)JO.
Alcorn Lynn A.
Woods Gerald L.
Kennametal Inc.
Smith Matthew W.
Tsay Frank
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