公开(公告)号：US20210154749A1

公开(公告)日：2021-05-27

申请号：US16965385

申请日：2019-01-25

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Brett A. Parendo ,  Alexander R. Greenhill ,  David Hlavac ,  Carter A. Gibson

IPC: B23B51/02

Abstract: A drill bit includes a body having a first end, a second end opposite the first end, and an axis of rotation extending centrally though the body from the first end to the second end. The body defining an outer diameter. The drill bit also includes a shank adjacent the second end of the body configured to couple to a tool and a cutting head adjacent the first end. The cutting head includes a plurality of axially stacked, progressively sized steps including a first step and a terminal step positioned between the first step and the first end of the body. The steps increase in diameter from the first step to the terminal step. The terminal step having a diameter that is less than or equal to the outer diameter.

公开(公告)号：US20190232391A1

公开(公告)日：2019-08-01

申请号：US16260226

申请日：2019-01-29

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Brett A. Parendo ,  Alexander R. Greenhill ,  David Hlavac ,  Carter A. Gibson

IPC: B23B51/02

CPC classification number: B23B51/02 ,  B23B2251/046 ,  B23B2251/14 ,  B23B2251/18

Abstract: A drill bit includes a body having a first end, a second end opposite the first end, and an axis of rotation extending centrally through the body. The drill bit includes a cutting head with a cutting tip on the axis of rotation and a cutting portion. The cutting portion includes first tip surfaces on opposite sides of the axis of rotation and second tip surfaces on opposite sides of the axis of rotation. Each first tip surface extends radially outward from the cutting tip to a corresponding second tip surface. Each second tip surface extends from a corresponding first tip surface to an outer periphery of the body. The first tip surfaces define a first tip angle measured through the axis of rotation that is oblique. The second tip surfaces define a second tip angle measured through the axis of rotation that is smaller than the first tip angle.