Boring tool
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United States of America Patent
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Nov 24, 1998
Issued Date -
N/A
app pub date -
Apr 28, 1997
filing date -
Jun 3, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary boring tool has a body formed relative to a normal forward cutting direction with a main cutting edge extending transversely of the direction, a pair of side cutting edges extending backward in the direction from ends of the main cutting edge, a substantially planar front face extending substantially perpendicular to the direction from the main cutting edge, and a curved cutting face extending backward in the direction from the main cutting edge between the side edges. This curved face is formed in turn with a respective raised side crest at each side edge spaced backward in the direction from the main cutting edge, a depressed central region between the side crests and extending forward generally to the main cutting edge, a respective side flank between and merging smoothly with each of the crests and the central region and extending generally to the main cutting edge, and a twisted land extending along the main cutting edge between same and the crests, central region and side flanks, and forming with the front face an angle that decreases steadily from each side edge toward a center of the main cutting edge.
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