Hole cutter with multiple fulcrums

Patent metadata

Field	Value
Publication number	US-11103934-B2
Application number	US-201916713221-A
Country	US
Kind code	B2
Filing date	Dec 13, 2019
Priority date	Jan 13, 2010
Publication date	Aug 31, 2021
Grant date	Aug 31, 2021

Abstract

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.

First claim

What is claimed is:

1. A hole cutter comprising:
a substantially cylindrical blade body having a smooth outer wall, a cutting edge at a top end of the blade body and a base portion at a bottom end of the blade body, the blade body defining a longitudinal axis extending from the bottom end to the top end;
a first aperture portion formed through the blade body and spaced from the cutting edge such that a portion of the blade body is disposed between the cutting edge and the first aperture portion, the first aperture portion bounded at least partially by a first curvilinear surface that defines a first fulcrum and wherein the first aperture portion is configured to receive therethrough a lever with the lever engaging the first fulcrum to lever a slug toward the top of the blade body to facilitate removing the slug from the blade body;
a second aperture portion formed through the blade body and spaced from the cutting edge such that a portion of the blade body is disposed between the cutting edge and the second aperture portion, the second aperture portion bounded at least partially by a second curvilinear surface that defines a second fulcrum and wherein the second aperture portion is configured to receive therethrough a lever with the lever engaging the second fulcrum to lever the slug toward the top of the blade body to facilitate removing the slug from the blade body; and
a third aperture portion formed through the blade body and spaced from the cutting edge such that a portion of the blade body is disposed between the cutting edge and the third aperture portion, the third aperture portion bounded at least partially by a third curvilinear surface that defines a third fulcrum and wherein the third aperture portion is configured to receive therethrough a lever with the lever engaging the third fulcrum to lever the slug toward the top of the blade body to facilitate removing the slug from the blade body,
wherein the first fulcrum is axially spaced from the cutting edge by a first distance, the second fulcrum is axially spaced from the cutting edge by a second distance that is greater than the first distance, and the third fulcrum is axially spaced from the cutting edge by a third distance that is greater than the second distance, and
wherein the first fulcrum, the second fulcrum, and the third fulcrum are aligned along an aperture axis at an acute angle to the longitudinal axis.

2. The hole cutter of claim 1 , wherein the first curvilinear surface at least partially bounds a bottom portion of the first aperture portion, the second curvilinear surface at least partially bounds a bottom portion of the second aperture portion, and the third curvilinear surface at least partially bounds a bottom portion of the third aperture portion.

3. The hole cutter of claim 2 , wherein the first aperture portion is also at least partially bounded by a top surface that is generally straight and parallel to the cutting edge.

4. The hole cutter of claim 1 , wherein each of the first curvilinear surface, the second curvilinear surface, and the third curvilinear surface are concave and face toward the top end of the blade body.

5. The hole cutter of claim 1 , wherein the first aperture portion is in communication with the second aperture portion.

6. The hole cutter of claim 5 , wherein the second aperture portion is in communication with the third aperture portion.

7. The hole cutter of claim 1 , wherein the cutting edge defines a direction of rotation that is a cutting direction of the cutting edge.

8. The hole cutter of claim 7 , wherein the first fulcrum is angularly spaced about the circumference of the blade body from the second fulcrum in the cutting direction.

9. The hole cutter of claim 8 , wherein the second fulcrum is angularly spaced about the circumference of the blade body from the third fulcrum in the cutting direction.

10. The hole cutter of claim 1 , wherein the blade body defines a first set that includes the first aperture portion, the second aperture portion, and the third aperture portion, and a second set that includes a fourth aperture portion, a fifth aperture portion, and a sixth aperture portion that are substantially the same as the first aperture portion, the second aperture portion, and the third aperture portion, respectively, the first set and the second set disposed on opposite sides of the blade body.

Assignees

• Black & Decker Inc

Inventors

• Novak Joseph Thomas
• Green Matthew Christopher

Classifications

• B23B51/0453 Primary

  with ejecting devices · CPC title

• B23B2260/082

  Holes · CPC title

• Y10T408/895

  Having axial, core-receiving central portion · CPC title

• B23B2251/428

  Operations & Transport · mapped topic

• B23B51/0406

  Operations & Transport · mapped topic