Annular hole cutter
AssigneeHougen Manufacturing, Inc.
InventorJeffrey Steven Gill
Life of this patent
Estimating the term…
Abstract
An annular hole cutter includes a cutter body having cutting teeth and a plurality of flutes extending from the cutting teeth around a side wall between a first and second end, with the flutes separated from each other by a land. The hole cutter includes side walls defining primary and secondary flutes with each one of the primary flutes defining first and second helix angles, and with each one of the secondary flutes defining a third helix angle and a fourth helix angle, with the second helix angle being greater than the first helix angle.
Claims18
An annular hole cutter for cutting holes in a workpiece, said annular cutter comprising:
- a cutter body having a cylindrical side wall defining an outer periphery with said cutter body extending a length between a first end and a second end, said cutter body including a plurality of cutting teeth spaced circumferentially around said second end, with a centerline extending through a center of said cutter body parallel to said length;
- a plurality of flutes extending from said plurality of cutting teeth around said cylindrical side wall between said first end and said second end, each of said plurality of flutes comprising a flute bottom, a circumferentially leading side wall extending transverse from said flute bottom to define a primary flute, and a circumferentially trailing side wall extending transverse from said flute bottom and spaced from said circumferentially leading side wall to define a secondary flute, said circumferentially leading side wall and said circumferentially trailing side wall of said plurality of flutes each including a cutting flute portion adjacent to said second end and an auger flute portion extending from said cutting flute portion and adjacent to said first end;
- and
- a plurality of lands, with a respective one land of said plurality of lands separating each respective adjacent pair of said plurality of flutes at said outer periphery;
- wherein said cutting flute portion of said circumferentially leading side wall of each of said plurality of flutes defines a first straight line which extends along a length of said circumferentially leading side wall, and wherein said auger flute portion of said circumferentially leading side wall of each of said plurality of flutes defines a second straight line which extends along a length of said circumferentially leading side wall, wherein a first helix angle is defined between said centerline of said cutter body and said first straight line, and wherein a second helix angle is defined between said centerline of said cutter body and said second straight line, and
- wherein said second helix angle is greater than said first helix angle.
Dependencies are inferred from the claim text.