Hole cutter with extruded cap

Patent metadata

Field	Value
Publication number	US-9434033-B2
Application number	US-68710210-A
Country	US
Kind code	B2
Filing date	Jan 13, 2010
Priority date	Jan 13, 2010
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A hole cutter having an extruded plate cap and methods and apparatuses for making such caps and hole cutters. The plate cap has planar opposing external and internal surfaces with an extruded hub extending axially inwardly from the internal surface. An aperture extends axially through the hub from the external surface. At least a portion of the aperture can be threaded for threaded engagement with a driving arbor. The hub is long enough so that the threaded portion contains at least two full threads. A blade body with a cutting edge is attached to the cap to form a hole cutter.

First claim

What is claimed is:

1. A hole cutter for cutting a work piece, comprising:
a plate steel cap defining substantially planar opposing external and internal surfaces, a periphery defining a flange, an extruded hub extending axially inwardly from the internal surface and defining an aperture extending through the plate cap and hub, wherein the aperture has a threaded portion extending along at least a portion of its length, and the hub extends axially inwardly from the internal surface a sufficient distance such that the threaded portion defines at least two full threads;
wherein at least a portion of at least one of the external surface and internal surface is stippled; and
an annular blade body extending axially from the cap, the blade body defining a cutting edge at a distal end from the cap.

2. A hole cutter as defined in claim 1 , further comprising a recess between the opposing surfaces defining a “B” diameter.

3. A hole cutter as defined in claim 2 , wherein the thickness of the cap between the “B” diameter and the hub is at least about 0.134″.

4. A hole cutter as defined in claim 2 , wherein the thickness of the cap between the “B” diameter and the hub is between about 0.134″ and about 0.165″.

5. A hole cutter as defined in claim 1 , wherein the aperture is configured for engagement with an arbor.

6. A hole cutter as defined in claim 1 , wherein the periphery further defines an “A” diameter of the hole cutter that is at least about 3″.

7. A hole cutter as defined in claim 1 , wherein the threaded portion is axially-inwardly offset from the external surface.

8. A hole cutter as defined in claim 1 , wherein a portion of the external surface surrounding the aperture is not stippled.

9. A hole cutter as defined in claim 1 , wherein recesses in the stippled portion define pyramid shapes.

10. A hole cutter as defined in claim 9 , wherein the pyramid shapes define 45° angles.

11. A hole cutter as defined in claim 1 , wherein the threaded portion extends within a portion of the aperture defined by the hub.

12. A hole cutter as defined in claim 1 , wherein at least a portion of the threaded portion extends into a portion of the aperture located axially inwardly from the internal surface.

13. A hole cutter as defined in claim 1 , wherein the threaded portion is axially offset from the external surface.

14. A hole cutter as defined in claim 1 , wherein a portion of the aperture is unthreaded.

15. A hole cutter as defined in claim 1 , wherein the thickness of the plate cap and hub is at least about 0.187 inches.

16. A method of manufacturing a hole cutter, comprising:
forming a cap blank from plate steel defining generally planar external and internal opposing surfaces;
forming a flange at a periphery of the cap blank;
forming an aperture though the cap blank extending from the external surface to the internal surface and defining an axis that is substantially perpendicular to the external and internal surfaces;
extruding the cap blank at the aperture to form a hub extending along the axis inwardly from the external surface and past the internal surface, wherein the aperture extends through the hub; and
threading at least a portion of the aperture to form a threaded portion configured for engagement with an arbor;
stippling at least a portion of at least one of the external and internal surfaces;
attaching an axially-extending annular blade body to the cap blank, wherein the blade body defines a cutting edge at a distal end from the cap blank; and
wherein the extruding step comprises extruding the hub sufficiently past the internal surface such that the threaded portion defines at least two full threads.

17. A method as defined in claim 16 , wherein, after extruding, the hub has a length in a direction of the axis of at least about 0.187″.

18. A method as defined in claim 16 , wherein the threaded portion is formed axially offset from the first surface in a direction toward the internal-sec-end surface.

19. A method as defined in claim 16 , further comprising forming a “B” diameter between the external and internal surfaces.

20. A method as defined in claim 19 , wherein the “B” diameter is formed by coining the cap blank with a die.

21. A method as defined in claim 20 , wherein after the coining step, the thickness of the cap blank between the “B” diameter and the hub is at least about 0.134″.

22. A method as defined in claim 21 , wherein the thickness of the cap blank between the “B” diameter and the hub is between about 0.134″ and about 0.165″.

23. A method as defined in claim 16 , further comprising forming an “A” diameter at the periphery of the cap blank.

24. A method as defined in claim 23 , wherein the “A” diameter is formed by trimming the periphery with a die.

25. A method as defined in claim 16 , wherein a portion of the first surface surrounding the aperture is not stippled.

26. A method as defined in claim 16 , wherein the stippling step comprises forming surface recesses defining pyramid shapes.

27. A method as defined in claim 26 , wherein the pyramid shapes define 45° angles.

28. A method as defined in claim 16 , wherein the stippling is formed using a punch.

29. A hole cutter for cutting a work piece formed by a method comprising the steps of:
forming a cap blank from plate steel defining generally planar external and internal opposing surfaces;
forming a flange at a periphery of the cap blank;
forming an aperture though the cap blank extending from the external surface to the internal surface and defining an axis that is substantially perpendicular to the external and internal surfaces;
extruding the cap blank at the aperture to form a hub extending along the axis inwardly from the external surface and past the internal surface, wherein the aperture extends through the hub;
threading at least a portion of the aperture to form a threaded portion configured for engagement with an arbor;
stippling at least a portion of at least one of the external and internal surfaces;
attaching an axially-extending annular blade body to the cap blank, wherein the blade body defines a cutting edge at a distal end from the cap blank;
wherein the extruding step comprises extruding the hub sufficiently past the internal surface such that the threaded portion defines at least two full threads.

30. A hole cutter as defined in claim 29 , wherein attaching the axially extending annular blade body to the cap blank comprises welding the annular blade body to the cap blank.

31. A hole cutter as defined in claim 29 , wherein the hub has a length in a direction of the axis of at least about 0.187″.

32. A hole cutter as defined in claim 29 , wherein the threaded portion is axially-offset from the external surface in a direction toward the internal surface.

33. A hole cutter as defined in claim 29 , the method further comprising forming a “B” diameter between the external and internal surfaces.

34. A hole cutter as defined in claim 33 , wherein the “B” diameter is formed by coining the cap blank with a die.

35. A hole cutter as defined in claim 33 , wherein the thickness of the cap blank between the “B” diameter and the hub is between about 0.134″ and about 0.165″.

36. A hole cutter as defined in cl

Assignees

• Novak Joseph Thomas
• Zielonka Robert Richard
• Korb William B
• Irwin Ind Tool Co

Inventors

• Novak Joseph Thomas
• Zielonka Robert Richard
• Korb William B

Classifications

• Y10T408/895

  Having axial, core-receiving central portion · CPC title

• B23P15/28 Primary

  cutting tools (sawing tools B23D63/00, B23D65/00; files or rasps B23D73/00) · CPC title

• B23B51/0473

  Details about the connection between the driven shaft and the tubular cutting part; Arbors · CPC title

• B21K25/00

  Uniting components to form integral members, e.g. turbine wheels and shafts, caulks with inserts, with or without shaping of the components (uniting by interference- or press-fitting B23P11/02, B21K19/02) · CPC title

• Y10T29/49

  Method of mechanical manufacture · CPC title