Patent ID: 9676041
Date: 2017-06-13
CPC Classifications: B23B,Y10T

Claim:
1. A power tool accessory comprising: a shank member including a shank portion and an accessory drive portion, the shank member having a first hardness; a conically-shaped body coupled to the shank member and including a series of stepped shoulders that increase in diameter from a tip portion to a base portion, a flute extending substantially from the tip portion to the base portion, with cutting edges defined at the intersection of the flute and the shoulders, and a drive socket defined in the base portion, wherein the body is separately formed from the shank member and has a second hardness greater than the first hardness; wherein the first hardness is between approximately 50 HRc and approximately 54 HRc, wherein the accessory drive portion of the shank member has a substantially square cross section and is received within the drive socket of the body, and wherein the body includes a detent aperture extending from the flute to the drive socket, and wherein the accessory drive portion of the shank member supports a detent ball arrangement that engages the detent aperture.