US 11,883,931 B2
Tool bit
James J. Van Essen, Hales Corners, WI (US); and Michael J. Zimmermann, New Berlin, WI (US)
Assigned to MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Aug. 12, 2022, as Appl. No. 17/886,856.
Application 17/886,856 is a continuation of application No. 16/542,509, filed on Aug. 16, 2019, granted, now 11,413,729.
Claims priority of provisional application 62/820,354, filed on Mar. 19, 2019.
Claims priority of provisional application 62/719,852, filed on Aug. 20, 2018.
Prior Publication US 2022/0379442 A1, Dec. 1, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B25B 15/00 (2006.01); B23K 26/356 (2014.01); B24C 1/10 (2006.01); B25B 23/00 (2006.01); B25B 21/00 (2006.01)
CPC B25B 15/002 (2013.01) [B23K 26/356 (2015.10); B24C 1/10 (2013.01); B25B 15/005 (2013.01); B25B 23/0035 (2013.01); B25B 15/007 (2013.01); B25B 15/008 (2013.01); B25B 21/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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.