Masonry drill bit
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United States of America Patent
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-
Apr 17, 2012
Grant Date -
Jul 22, 2010
app pub date -
Mar 1, 2007
filing date -
Mar 3, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A masonry drill bit includes a cutting insert which is substantially roof-shaped in sideview and has on each side of its “roof” one lip. Each lip includes a leading cutting surface and a trailing free surface, wherein the mutually abutting free surfaces at the roof ridge define a chisel edge. Each free surface is concave in a sub-zone adjacent to the chisel edge in a manner that the radially outer ends of the chisel edge axially protrude at the end face of the insert relative to the in-between center of the chisel edge. Each lip includes at least one recess and to that extent deviates from the substantially roof-shaped geometry.
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Cited Art Landscape
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