Hole saw

Patent metadata

Field	Value
Publication number	US-11084108-B2
Application number	US-201916672258-A
Country	US
Kind code	B2
Filing date	Nov 1, 2019
Priority date	Jul 18, 2012
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A hole saw includes a substantially cylindrical body defining a cutting end and an axis of rotation. The hole saw also includes first and second apertures formed through the body and spaced from the cutting end such that a portion of the body extends between the cutting end and both the first and second apertures. The first and second apertures are both configured to receive a tool for removing work piece plugs from within the cylindrical body. The first aperture is axially spaced from the cutting end a first distance. The second aperture is axially spaced from the cutting end a second distance that is greater than the first distance. The first aperture and the second aperture are separated by a portion of the body.

First claim

What is claimed is:

1. A hole cutter comprising:
a substantially cylindrical blade body having a smooth outer wall, the blade body defining a cutting edge and a longitudinal axis;
a first 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 first aperture, the first aperture configured to receive therethrough a lever for removing a work piece slug from an interior of the blade body and defining a first fulcrum configured for engaging the lever and for levering the slug out of the interior of the blade body by applying a sufficient levering force against the first fulcrum to lever the slug towards the cutting edge;
a second distinct 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 second aperture, the second aperture configured to receive therethrough a lever for removing a work piece slug from an interior of the blade body and defining a second fulcrum configured for engaging the lever and for levering the slug out of the interior of the blade body by applying a sufficient levering force against the second fulcrum to lever the slug towards the cutting edge;
wherein the first fulcrum is axially spaced from the cutting edge a first distance, the second fulcrum is axially spaced from the cutting edge a second distance that is greater than the first distance,
wherein the first fulcrum is defined by a substantially straight edge of the first aperture that is substantially parallel to the cutting edge,
wherein at least a portion of the first aperture and at least a portion of the second aperture are aligned along a line substantially parallel to the longitudinal axis and the first fulcrum and the second fulcrum are aligned along the line substantially parallel to the longitudinal axis, and
wherein at least one of the first aperture and the second aperture is bounded by a bottom edge axially spaced a third distance from the cutting edge, a top edge spaced a fourth distance from the cutting edge greater than the third distance, and a side edge connecting the bottom edge to the top edge and oriented at an acute angle to the longitudinal axis of the blade body.

2. The hole cutter of claim 1 , wherein the second fulcrum is defined by a substantially straight edge of the second aperture that is substantially parallel to the cutting edge.

3. The hole cutter of claim 2 , wherein the top edge is substantially parallel to the bottom edge.

4. The hole cutter of claim 1 , wherein the top edge is a substantially straight edge that is substantially parallel to the cutting edge and that defines at least one of the first fulcrum and the second fulcrum, and the bottom edge is a substantially straight edge that is substantially parallel to the top edge.

5. The hole cutter of claim 1 , wherein each of the first aperture and the second aperture defines a minimum width to allow insertion of a plug-removing tool therethrough.

6. The hole cutter of claim 1 , wherein the second aperture is axially elongated.

7. The hole cutter of claim 1 , wherein the first and second fulcrums are defined by first and second edges of the first and second apertures that are curved, curvilinear, rectilinear, or a combination thereof.

8. The hole cutter of claim 1 , wherein the top edge comprises:
a substantially straight edge comprising a first end and a distal second end;
a first curved corner at the first end; and
a second curved corner at the second end.

9. The hole cutter of claim 1 , wherein the cutting edge comprises a plurality of teeth disposed continuously around a circumference of the cutting edge.

10. The hole cutter of claim 1 , wherein the second aperture has a geometric shape that is distinct from that of the first aperture.

11. The hole cutter of claim 1 , wherein all of the first aperture and all of the second aperture are arranged on a same side of at least one plane that contains the longitudinal axis.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Piller Geoffrey R
• Thom Jason M
• Malloy Ryan J
• Taylor Todd A

Classifications

• B23B51/044

  with core holding devices · CPC title

• B23B51/04 Primary

  {Drills} for trepanning · CPC title

• Y10T408/895

  Having axial, core-receiving central portion · CPC title

• B23B2260/082

  Holes · CPC title

• B23B2260/072

  Grooves · CPC title