Hole cutter with multiple fulcrums

Patent metadata

Field	Value
Publication number	US-10137507-B2
Application number	US-201715608428-A
Country	US
Kind code	B2
Filing date	May 30, 2017
Priority date	Jan 13, 2010
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A hole cutter can include a cylindrical blade body with a cutting edge and one or more axially-elongated apertures. Each axially-elongated aperture can include a first fulcrum axially spaced from the cutting edge, and a second fulcrum axially spaced further away from the cutting edge than the first fulcrum. The blade body can also include a third fulcrum defined by a second aperture different from the one or more axially-elongated apertures. The third fulcrum may be spaced closer to the cutting than the first and second fulcrums. A lever, such as a screw driver, can be inserted into the apertures and placed against each of the fulcrums to lever slugs out of the interior of the blade body. The third fulcrum may alternatively be defined by another axially-elongated aperture that is located a different distance from the cutting edge than the axially-elongated aperture containing the first and second fulcrums.

First claim

What is claimed is:

1. A hole cutter comprising:
a substantially cylindrical blade body defining a cutting edge;
at least one first elongated aperture formed through the blade body and spaced from the cutting edge; and
at least one second aperture formed through the blade body, wherein the second aperture is separate from the first aperture and is spaced from the first aperture and from the cutting edge such that a portion of the blade body extends between the second aperture and the first aperture and a portion of the blade body extends between the second aperture and the cutting edge;
wherein each of the first and second apertures is configured to receive therethrough a lever for removing a work piece slug from an interior of the blade body, and the blade body defines (i) within the first aperture, a first fulcrum axially spaced a first distance from the cutting edge and a second fulcrum axially spaced a second distance from the cutting edge that is different from the first distance, and (ii) within the second aperture, a third fulcrum axially spaced from the cutting edge a third distance that is different from the first distance and the second distance, wherein each of the first, second and third fulcrums is configured for engaging the lever and levering slugs out of the interior of the blade body.

2. The hole cutter of claim 1 , wherein the second aperture and the first fulcrum are substantially axially-aligned relative to an axis of the hole cutter.

3. The hole cutter of claim 1 , wherein the second aperture is angularly spaced around the circumference of the blade body relative to the first and second fulcrums.

4. The hole cutter of claim 3 , wherein the cutting edge defines a direction of rotation of the hole cutter, and wherein the second aperture is angularly spaced relative to the first and second fulcrums in the direction of rotation.

5. A hole cutter comprising:
a substantially cylindrical blade body comprising a first end defining a cutting edge;
at least one elongated aperture formed through the blade body, wherein the elongated aperture is configured to receive therethrough a lever for removing a work piece slug from the interior of the blade body, and the blade body defines within the elongated aperture a plurality of fulcrums comprising:
a first fulcrum axially spaced a first distance from the cutting edge; and
a second fulcrum axially spaced a second distance from the cutting edge and greater than the first distance; and

a second aperture separate from the at least one elongated aperture, wherein material of the blade body is located between the second aperture and the at least one elongated aperture, wherein the second aperture is configured to receive therethrough the lever for removing the work piece slug from the interior of the blade body, and the blade body defines within the second aperture a third fulcrum spaced a third distance from the cutting edge for engaging the lever and levering the work piece slug out of the interior of the blade body.

6. The hole cutter of claim 5 , wherein the second aperture has a top end that is spaced a fourth distance from the cutting edge, wherein the fourth distance is different than the first distance and the second distance.

7. The hole cutter of claim 6 , wherein the fourth distance is less than the first distance and the second distance.

8. The hole cutter of claim 6 , wherein the fourth distance is at least approximately 0.15 inches.

9. The hole cutter of claim 5 , wherein the second aperture and the first aperture are substantially axially-aligned relative to an axis of rotation of the hole cutter.

10. The hole cutter of claim 5 , wherein the second aperture is angularly spaced around a circumference of the blade body relative to the first and second fulcrums.

11. The hole cutter of claim 10 , wherein the cutting edge defines a direction of rotation of the hole cutter, and wherein the second aperture is angularly spaced relative to the first and second fulcrums in the direction of rotation.

12. A hole cutter comprising:
a substantially cylindrical blade body comprising a first end and a distal second end, the first end defining a cutting edge and the second end defining a non-working end;
a first elongated aperture formed through the blade body, wherein the blade body defines within the first elongated aperture a first plurality of fulcrums comprising:
a first fulcrum axially spaced a first distance from the cutting edge; and
a second fulcrum axially spaced a second distance from the cutting edge greater than the first distance; and

a second elongated aperture formed through the blade body, wherein the blade body defines within the second elongated aperture a second plurality of fulcrums comprising:
a third fulcrum axially spaced a third distance from the cutting edge; and
a fourth fulcrum axially spaced a fourth distance from the cutting edge greater than the third distance,

wherein the first distance of the first fulcrum to the cutting edge is different than the third distance of the third fulcrum to the cutting edge.

13. The hole cutter of claim 12 , wherein a shape of the first elongated aperture is substantially the same as a shape of the second elongated aperture.

14. The hole cutter of claim 12 , wherein a shape of the first elongated aperture is different than a shape of the second elongated aperture.

15. The hole cutter of claim 12 , wherein the first and second elongated apertures are each oriented at an acute angle relative to an axis of rotation of the blade body.

16. The hole cutter of claim 15 , wherein the cutting edge defines a direction of rotation of the hole cutter, and wherein the first fulcrum of the first elongated aperture is angularly spaced on the blade body relative the third fulcrum of the second aperture in the direction of rotation.

Assignees

• Irwin Ind Tool Co

Inventors

• Novak Joseph
• Beach Justin
• Korb William

Classifications

• Y10T408/895

  Having axial, core-receiving central portion · CPC title

• B23B2260/082

  Holes · CPC title

• B23B51/0453 Primary

  with ejecting devices · CPC title

• B23B51/0406

  Operations & Transport · mapped topic

• B23B51/04

  {Drills} for trepanning · CPC title