Plug cutter with radial relief
AssigneeWoodworker's Supply, Inc.
InventorsJohn Wirth, Jr., Jay L. Sanger, Mark K. McCool
Life of this patent
Estimating the term…
Abstract
A plug cutter has a main body portion having a longitudinal axis, shank portion extending axially from one end of the main body, and a plurality of blades extending axially from an opposite end of the main body. The blades are formed so that at least a portion of the inner surfaces thereof have a measure of radial relief with respect to the leading edges of the blades. A radial distance from the axis of rotation of the plug cutter to the leading edge of each blade is always less than the radial distance from the axis of rotation to any other portion of the inner surface. Accordingly, when a plug is being cut with the plug cutter, a gap is defined between an outer surface of the plug and the radially relieved portion of the inner surfaces.
Claims21
A plug cutter rotatable about an axis of rotation comprising:
- a main body having a longitudinal axis coinciding with said axis of rotation
- a shank extending axially from one end of said main body concentrically with said axis of rotation;
- and
- a plurality of cutting blades extending axially from an opposite end of said main body and terminating in a distal end, each of said blades having an inner surface facing generally radially inwardly, said plurality of blades being adapted to cut a plug in a piece of stock as said plug cutter is rotated about said axis of rotation and advanced axially into the piece of stock, at least a portion of said inner surface of each said blade being radially relieved with respect to a leading edge thereof so that as said plug cutter is cutting the plug, a gap is defined between an outer surface of the plug being cut and said radially relieved portion, wherein said plurality of cutting blades are constructed and arranged so that when said plug cutter is rotated, said plurality of blades define a bore that is tapered along an extent thereof such that a radial distance between said leading edge and said axis of rotation is greater at said distal ends than adjacent said main body.
A plug cutter rotatable about an axis of rotation comprising:
- a main body having a longitudinal axis coinciding with said axis of rotation
- a shank extending axially from one end of said main body concentrically with said axis of rotation;
- and
- a plurality of cutting blades extending axially from an opposite end of said main body and terminating at a distal end, each of said blades having an inner surface facing generally radially inwardly, said plurality of blades being adapted to cut a plug in a piece of stock as said plug cutter is rotated about said axis of rotation and advanced axially into the piece of stock, each blade being formed so that, at a given axial position along each said blade, a radial distance from said axis of rotation to said inner surface is smallest at a leading edge thereof so that as said plug cutter is cutting the plug, substantially only said leading edge of each said blade is in contact with an outer surface of the plug, wherein said plurality of cutting blades are constructed and arranged so that when said plug cutter is rotated, said plurality of blades define a bore that is tapered along an extent thereof such that a radial distance between said leading edge and said axis of rotation is greater at said distal ends than adjacent said main body.
A plug cutter rotatable about an axis of rotation comprising:
- a main body having a longitudinal axis coinciding with said axis of rotation
- a shank extending axially from one end of said main body concentrically with said axis of rotation;
- and
- a plurality of cutting blades extending axially from an opposite end of said main body and terminating in a distal end, each of said blades having an inner surface facing generally radially inwardly, said plurality of blades being adapted to cut a plug in a piece of stock as said plug cutter is rotated about said axis of rotation and advanced axially into the piece of stock,
- said main body, shank, and plurality of cutting blades each being formed of stainless steel.
Dependencies are inferred from the claim text.