Cutting by use of rotating axially moving tool – Tool or tool with support – Having axial – core-receiving central portion
Reexamination Certificate
2011-06-28
2011-06-28
Howell, Daniel W (Department: 3726)
Cutting by use of rotating axially moving tool
Tool or tool with support
Having axial, core-receiving central portion
C408S068000
Reexamination Certificate
active
07967535
ABSTRACT:
A hole saw having a tubular cutting portion, a pilot drill bit, an ejection plate disposed within the tubular cutting portion and a compression spring cooperating with the plate further includes a guide structure fixed to the ejection plate and slidingly cooperating with a helical flute of the pilot drill bit. The compression spring and cooperating guide structure provide a combination of linear and rotational ejection of a waste plug from the hole saw. A duel set screw feature facilitates waste plug removal if needed and includes a first set screw frictionally engaged with a flat surface of the drill bit and a second set screw cooperating with a circular groove running about the drill bit.
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Brunscher David
Eiserer Cecil
Howell Daniel W
McMahon John C.
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