HOLE CUTTER WITH AXIALLY-ELONGATED APERTURE DEFINING MULTIPLE FULCRUMS

WIPO Patent Application WO/2011/088269

A8

A hole cutter has a cylindrical blade body including a cutting edge and one or more axially-elongated apertures formed within a side wall of the blade body. The axially-elongated aperture is configured to receive a lever, such as a screwdriver, therethrough. Each axially-elongated aperture includes a first fulcrum axially spaced adjacent to the cutting edge, a second fulcrum axially spaced further away from the cutting edge than the first fulcrum, and optionally a third fulcrum axially spaced between the first and second fulcrums. A lever, such as a screwdriver, can be inserted into the aperture and placed against each of the fulcrums to lever slugs out of the interior of the blade body.

JP2019217600	DRILLING METHOD, DRILLING DEVICE AND DRILLING ATTACHMENT FOR REGENERATION PIPE
WO/1994/027773	TREPANNING TOOL FOR DRILLING MACHINES

NOVAK JOSEPH THOMAS (US)
GREEN MATTHEW CHRISTOPHER (US)

PCT/US2011/021217

November 07, 2019

January 13, 2011

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IRWIN IND TOOL CO (US)
NOVAK JOSEPH THOMAS (US)
GREEN MATTHEW CHRISTOPHER (US)

B23B51/05

GIARRATANA, Mark D. et al. (US)

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