Cutting by use of rotating axially moving tool – Tool of specific diverse material
Reexamination Certificate
2007-07-10
2007-07-10
Carter, Monica (Department: 3722)
Cutting by use of rotating axially moving tool
Tool of specific diverse material
C408S230000
Reexamination Certificate
active
10437971
ABSTRACT:
A drill comprises a shaft with chip conveying flutes and a drill head at its forward end with at least two cutting inserts. Each cutting insert is provided with at least one cutting edge which is delimited between a chipbreaking surface and first relief surface and which includes an outer straight edge. In the proximity of the center axis of the shaft, a curved cutting edge section is provided, to which there is connected an adjacent enforcement bevel. The cutting edge is in direct proximity to a center axis, and is terminated by a chisel edge between the cutting inserts to serve as a centering core portion. The curved cutting edge section is inwardly followed by a primary straight portion without an adjacent enforcement bevel in a direction that is oriented at an angle of between approximately 40–50° in relation to a horizontal line that extends through the center axis of the drill.
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Carter Monica
Drinker Biddle & Reath LLP
Sandvik Intellectual Property AB
Talbot Michael W.
LandOfFree
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