Tool bit
AssigneeMilwaukee Electric Tool Corporation
InventorsJames J. Van Essen, Michael J. Zimmermann
Life of this patent
Estimating the term…
Abstract
A tool bit includes a drive portion configured to be engaged by a tool, the drive portion including a first maximum outer dimension, a shank extending from the drive portion and including a reduced outer diameter, and a tip coupled to an end of the shank opposite from the drive portion. The tip includes a compressive residual stress layer formed by blasting to increase a wear resistance of the tip relative to the shank. The tip additionally includes a second maximum outer dimension. The reduced outer diameter of the shank is smaller than the first maximum outer dimension of the drive portion and the second maximum outer dimension of the tip.
Claims20
A tool bit comprising:
- a drive portion configured to be engaged by a tool;
- a shank extending from the drive portion;
- a tip coupled to an end of the shank opposite from the drive portion, the tip having a compressive residual stress layer formed by blasting to increase a wear resistance of the tip relative to the shank;
- and
- a rust preventative coating applied to the compressive residual stress layer of the tip.
A method of manufacturing a tool bit, the method comprising:
- providing a piece of stock metal;
- forming a drive portion in the piece of stock metal, the drive portion configured to be engaged by a tool;
- forming a tip in the piece of stock metal;
- forming a shank in the piece of stock metal between the tip and the drive portion;
- and
- blasting the tip to form a compressive residual stress layer that increases a wear resistance of the tip relative to the shank;
- wherein blasting the tip includes
- laser blasting the tip by impacting the tip with a high-energy pulsed laser beam, or
- laser ablating the tip by focusing a laser onto the tip to remove material from an irradiated zone and break down chemical bonds on a surface of the tip.
A tool bit comprising:
- a drive portion configured to be engaged by a tool;
- a shank extending from the drive portion;
- and
- a tip coupled to an end of the shank opposite from the drive portion, the tip having a compressive residual stress layer formed by laser blasting the tip with a high-energy pulsed laser beam to increase a wear resistance of the tip relative to the shank.
Dependencies are inferred from the claim text.