Hole cutter with multiple fulcrums

Patent metadata

Field	Value
Publication number	US-12036617-B2
Application number	US-202117387497-A
Country	US
Kind code	B2
Filing date	Jul 28, 2021
Priority date	Jan 13, 2010
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

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 method of levering a slug out of an interior of a hole cutter that includes a substantially cylindrical blade body extending along a longitudinal axis and including a cutting edge at one end of the blade body, the method comprising:
inserting a lever into an elongated aperture formed through the blade body and spaced from the cutting edge such that a portion of the blade body extends between the cutting edge and the elongated aperture, the elongated aperture including a first portion with a first fulcrum surface axially spaced from the cutting edge by a first distance, a second portion with a second fulcrum surface axially spaced from the cutting edge by a second distance greater than the first distance, and an intermediate portion connecting the first portion and the second portion and oriented at an acute angle to the longitudinal axis of the blade body;
levering the lever against the second fulcrum surface to push the slug at least partially out of the interior of the hole cutter by pushing a bottom of the slug toward the first fulcrum portion; and
levering the lever against the first fulcrum surface to push the slug further out of the interior of the hole cutter by pushing the bottom of the slug further toward the cutting edge.

2. The method of claim 1 , wherein the first fulcrum surface and the second fulcrum surface are angularly spaced around a circumference of the blade body from each other.

3. The method of claim 2 , wherein the hole cutter defines a direction of rotation that is a cutting direction of the cutting edge, and the first fulcrum surface and the second fulcrum surface are angularly spaced around the circumference of the blade body in the direction of rotation in order of decreasing distance from the cutting edge of the fulcrum surfaces.

4. The method of claim 1 , wherein the first portion is located at approximately a first end of the aperture and the second portion is located at approximately a second end of the aperture opposite the first end.

5. The method of claim 1 , wherein the aperture is oriented generally at an acute angle relative to the longitudinal axis of the blade body.

6. The method of claim 1 , wherein each of the first fulcrum surface and the second fulcrum surface include a curvilinear portion engaged by the lever.

7. The method of claim 1 further comprising, prior to levering the lever against the second fulcrum surface, levering the lever against a third fulcrum surface in a third portion of the elongated aperture to push the bottom of the slug toward the second portion, the third fulcrum surface axially spaced from the cutting edge by a third distance greater than the second distance.

8. The method of claim 7 , wherein a second intermediate portion connects the third portion and the second portion.

9. The method of claim 7 , wherein the third fulcrum surface is angularly spaced around a circumference of the blade body from the first fulcrum surface and the second fulcrum surface.

10. The method of claim 7 , wherein each of the first fulcrum surface, the second fulcrum surface, and the third fulcrum surface include a curvilinear portion engaged by the lever.

11. A method of levering a slug out of an interior of a hole cutter that includes a substantially cylindrical blade body extending along a longitudinal axis and including a cutting edge at one end of the blade body, the method comprising:
inserting a lever into a fully enclosed first aperture portion formed through the blade body and spaced from the cutting edge such that a portion of the blade body extends between the cutting edge and the first aperture portion, the first aperture portion at least partially defined by a first bottom edge substantially parallel to the cutting edge and a first side edge at an angle to the cutting edge and including a first fulcrum surface spaced from the cutting edge by a first distance;
levering the lever against the first fulcrum surface to push the slug partially out of the interior of the blade body by pushing the bottom of the slug toward the cutting edge;
inserting the lever into a fully enclosed second aperture portion formed through the blade body and spaced from the cutting edge such that a portion of the blade body extends between the cutting edge and the second aperture portion, the second aperture portion at least partially defined by a second bottom edge substantially parallel to the cutting edge and a second side edge at an angle to the cutting edge and including a second fulcrum surface spaced from the cutting edge by a second distance that is less than the first distance; and
levering the lever against the second fulcrum surface to push the slug partially out of the interior of the blade body by pushing the bottom of the slug toward the cutting edge.

12. The method of claim 11 , wherein the second fulcrum surface is angularly spaced around a circumference of the blade body from the first fulcrum surface.

13. The method of claim 12 , wherein the hole cutter defines a direction of rotation that is a cutting direction of the cutting edge, and the second fulcrum surface is angularly spaced around the circumference of the blade body from the first fulcrum surface in the direction of rotation.

14. The method of claim 11 , wherein the first aperture portion is in communication with the second aperture portion via a slot portion.

15. The method of claim 11 , wherein the first aperture portion includes a first top edge that is generally parallel to the first bottom edge and that is spaced from the cutting edge by a third distance that is less than the first distance and greater than the second distance.

16. The method of claim 15 , wherein the second aperture portion includes a second top edge that is generally parallel to the second bottom edge and that is spaced from the cutting edge by a fourth distance that is less than the second distance.

17. The method of claim 11 , wherein each of the first aperture portion and the second aperture portion defines a minimum width to allow insertion of a number 2 screwdriver therethrough.

18. The method of claim 11 , further comprising:
inserting the lever into a third aperture portion formed through the blade body and spaced from the cutting edge such that a portion of the blade body extends between the cutting edge and the third aperture portion, the third aperture portion at least partially defined by a third bottom edge substantially parallel to the cutting edge and a third side edge at an angle to the cutting edge and including a third fulcrum surface spaced from the cutting edge by a third distance that is less than the second distance;
levering the lever against the third fulcrum surface to push the slug at least partially out of the interior of the blade body by pushing the bottom of the slug toward the cutting edge.

19. The method of claim 18 , wherein the third fulcrum surface is angularly spaced around a circumference of the blade body from the second fulcrum surface and the second fulcrum surface is angularly spaced around a circumference of the blade body from the first fulcrum surface.

20. The method of claim 18 , wherein the first aperture portion is in communication with the second aperture portion via a first slot portion and the second aperture portion is in communication with the third aperture portion via a second slot portion.

Assignees

• Black & Decker Inc

Inventors

• Novak Joseph Thomas
• Green Matthew Christopher

Classifications

• B23B51/0453 Primary

  with ejecting devices · CPC title

• Y10T408/8953

  with lateral outlet · CPC title

• Y10T408/895

  Having axial, core-receiving central portion · CPC title

• B23B2260/082

  Holes · CPC title

• B23B51/0467 Primary

  Details of the tubular body sidewall · CPC title