US Patent No. 9,579,732

HOLE SAW


Patent No. 9,579,732
Issue Date February 28, 2017
Title Hole Saw
Inventorship Geoffrey R. Piller, Whitefish Bay, WI (US)
Jason M. Thom, Wauwatosa, WI (US)
Ryan J. Malloy, Milwaukee, WI (US)
Todd A. Taylor, West Bend, WI (US)
Assignee MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)

Claim of US Patent No. 9,579,732

13. A hole saw comprising:
a cylindrical body disposed along an axis of rotation and having a side wall extending axially from a cap end to a cutting
end, the cutting end including a plurality of cutting teeth; and

a cap including a rim portion seated on the cap end and an axially extending portion extending into the cylindrical body from
the cap end;

wherein the side wall defines an aperture comprising:
a first slot portion oriented substantially perpendicular to the axis;
a second slot portion oriented substantially perpendicular to the axis and disposed closer to the cap end than the first slot
portion, the second slot portion including a first wall oriented substantially perpendicular to the axis and a second wall
oriented substantially perpendicular to the axis, the second slot portion being circumferentially offset from the first slot
portion, the first wall of the second slot portion nearest the cap end being between approximately 0.010 inches and approximately
0.120 inches axially offset from the axially extending portion of the cap; and

a connecting slot portion connecting the first slot portion and the second slot portion; and
wherein the first slot portion includes an upper wall and a lower wall, each oriented substantially perpendicular to the axis,
the lower wall of the first slot portion being closer to the cutting end; and

wherein the aperture has a first side and a second side, the first side including the first wall, the second wall, and the
upper wall, the second side being non-linear and generally matching a contour of the first side, the second side including
a bump curved toward the first side and a radial wall that provides a smooth transition from the first wall of the second
slot portion to the bump with no undercut.