Hole cutter with multiple fulcrums

Patent metadata

Field	Value
Publication number	US-9884374-B2
Application number	US-201615254926-A
Country	US
Kind code	B2
Filing date	Sep 1, 2016
Priority date	Sep 3, 2015
Publication date	Feb 6, 2018
Grant date	Feb 6, 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 and a longitudinal axis; a first elongated aperture formed through the blade body, elongated along an aperture axis at an acute angle to the longitudinal axis and spaced from the cutting edge; a second aperture formed through the blade body, wherein the second aperture (i) is separate from the first aperture, (ii) is axially spaced between the first aperture and the cutting edge such that a portion of the blade body extends between the second aperture and the first elongated aperture, (iii) is angularly spaced around the circumference of the blade body from the first elongated aperture such that a portion of the blade body that is parallel to the longitudinal axis extends from the cutting edge towards a rim of the blade body and between the entirety of the second aperture and the first elongated aperture, (iv) is aligned with the aperture axis, and (iv) is spaced from the cutting edge such that 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 elongated aperture, a first fulcrum and a second fulcrum axially spaced relative to the first fulcrum, and (ii) within the second aperture, a third fulcrum axially spaced between the first fulcrum and the cutting edge, 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 is substantially circular.

3. The hole cutter of claim 1 , wherein the second aperture is oval, square, square with rounded corners, or rectangular.

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

5. 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.

6. The hole cutter of claim 1 , wherein the portion of the blade body that is parallel to the longitudinal axis extends from the cutting edge to the rim of the blade body.

7. A hole cutter comprising: a substantially cylindrical blade body comprising a first end defining a cutting edge, a distal second end, and defining a longitudinal axis; a first elongated aperture formed through the blade body and extending along an aperture axis, wherein the first 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 first 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; a second aperture separate from the first elongated aperture and aligned with the aperture axis, wherein a first portion of the blade body is located between the second aperture and the first elongated aperture in a direction perpendicular to the longitudinal axis, wherein a second portion of the blade body extends from the first end of the blade body towards the second end of the blade body in a direction parallel to the longitudinal axis and between the entirety of the second aperture and the first elongated aperture in the direction parallel to the longitudinal axis, 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 one of a substantially circular aperture and a single fulcrum for engaging the lever and levering the work piece slug out of the interior of the blade body.

8. The hole cutter of claim 7 , wherein the second aperture is spaced a first distance from the cutting edge, wherein the first fulcrum is spaced a second distance from the cutting edge, wherein the second fulcrum is spaced a third distance from the cutting edge, and wherein the first distance is different than the second distance and the third distance.

9. The hole cutter of claim 8 , wherein the first distance is less than the second distance and the third distance.

10. The hole cutter of claim 7 , wherein the second aperture and the first fulcrum are substantially aligned relative to the aperture axis.

11. The hole cutter of claim 7 , wherein the second aperture is substantially circular.

12. The hole cutter of claim 11 , wherein the second aperture is angularly spaced around a circumference of the blade body relative to the first and second fulcrums.

13. The hole cutter of claim 12 , 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.

14. The hole cutter of claim 7 , wherein the second aperture is oval, square, square with rounded corners, rectangular, radiused or curved, or a combination thereof.

15. The hole cutter of claim 7 , wherein the second portion extends from the first end of the blade body to the second end of the blade body.

16. 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 axially-elongated aperture formed through the blade body and extending along its entire axial extent from a top edge spaced from the cutting edge by a first height to a bottom edge spaced from the cutting edge by a second height that is greater than the first height, wherein the blade body defines within the first axially-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;

a second axially-elongated aperture formed through the blade body and extending along its entire axial extent from a top edge spaced from the cutting edge by a third height to a bottom edge spaced from the cutting edge by a fourth height that is greater than the third height, wherein the blade body defines within the second axially-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, the first height is different from the third height, and the second height is different from the fourth height.

17. The hole cutter of claim 16 , wherein a shape of the first axially-elongated aperture is substantially the same as a shape of the second axially-elongated aperture.

18. The hole cutter of claim 16 , wherein a shape of the first axially-elongated aperture is different than a shape of the second axially-elongated aperture.

19. The hole cutter of claim 16 , wherein the first and second axially-elongated apertures are each oriented at an acute angle relative to an axis or rotation of the blade body.

20. The hole cutter of claim 19 , wherein th

Assignees

• Irwin Ind Tool Co

Inventors

• Novak Joseph
• Korb William
• Beach Justin

Classifications

• Y10T408/895

  Having axial, core-receiving central portion · CPC title

• B23B2270/28

  Cleaning · CPC title

• B23B51/0453 Primary

  with ejecting devices · CPC title

• B23B2251/428

  Operations & Transport · mapped topic

• B23B51/044

  with core holding devices · CPC title