Boring tool
AssigneeApex Brands, Inc.
InventorLaverne Royal Durfee
Life of this patent
Estimating the term…
Abstract
A boring tool includes a coupling portion, a shank, and a cutting portion. The shank further includes a torsion release neck, having a smaller diameter cross section than a first end of the shank and a second end of the shank, a first transition to the first end of the shank, and a second transition to the second end of the shank. A torsion release neck has a lower polar moment of inertia than other portions of the boring tool so that it may guide torsional loading and shear stresses in the boring tool away from the cutting and coupling portions to improve the durability of the boring tool as a whole.
Claims20
A boring tool comprising:
- a coupling portion;
- a shank;
- and
- a cutting portion,
- wherein the shank further comprises:
- a first end proximate to the coupling portion,
- a second end proximate to the cutting portion,
- a torsion release neck disposed between the first end and the second end,
- a first transition between the first end and the torsion release neck, and
- a second transition between the second end and the torsion release neck, and
- wherein the coupling portion is configured to be operably coupled to a driving device to rotate the boring tool.
A method of making a boring tool, the method comprising:
- machining the boring tool from a metallic bar stock such that the boring tool includes a coupling portion, a shank, and a cutting portion;
- and
- machining the shank to define a first end proximate to the coupling portion, a second end proximate to the cutting portion, and a torsion release neck disposed between the first end and the second end;
- and
- machining a first transition between the first end and the torsion release neck, and a second transition between the second end and the torsion release neck,
- wherein the coupling portion is configured to be operably coupled to a driving device to rotate the boring tool.
Dependencies are inferred from the claim text.