公开(公告)号：USD892183S1

公开(公告)日：2020-08-04

申请号：US29726559

申请日：2020-03-04

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Designer： Brett A. Parendo ,  Richard Hohnl, Jr. ,  David Hlavac ,  Alexander R. Greenhill ,  Ingolfur Ludviksson

公开(公告)号：US11691203B2

公开(公告)日：2023-07-04

申请号：US17355500

申请日：2021-06-23

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Brett A. Parendo ,  Richard Hohnl, Jr. ,  David Hlavac ,  Alexander R. Greenhill ,  Ingolfur Ludviksson ,  Max R. Sawa ,  James E. Pangerc

IPC: B23B51/02 ,  B23B51/00

CPC classification number: B23B51/009 ,  B23B2251/043

Abstract: A step drill bit includes a shank and a body having a proximal end adjacent the shank and a distal end opposite the proximal end. The body defines a plurality of axially stacked, progressively sized steps including a first step at the distal end, a terminal step at the proximal end, and a plurality of intermediate steps having incrementally increasing diameters disposed between the first and terminal steps. The step drill bit also includes a plurality of cutting edges each disposed along one of the plurality of steps. Each edge defines a helix angle and a radial rake angle. The radial rake angle and the helix angle of the cutting edge at the terminal step is greater than the radial rake angle and the helix angle of the cutting edge at the first step.

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.

公开(公告)号：US20220339715A1

公开(公告)日：2022-10-27

申请号：US17861599

申请日：2022-07-11

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

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

IPC: B23B51/02

Abstract: A method of manufacturing a drill bit includes providing a piece of bar stock having a first end, a second end opposite the first end, and an axis of rotation extending centrally through the bar stock between the first and second ends, cutting the first end of the bar stock to form a first tip angle at an oblique angle measured through the axis of rotation, cutting the first end of the bar stock at a second tip angle measured through the axis of rotation to form first tip surfaces and second tip surfaces. The first tip surfaces have the first tip angle and the second tip surfaces have the second tip angle. The second tip angle is smaller than the first tip angle. Finally forming a flute in the bar stock between the first and second ends and forming a shank at the second end of the bar stock.

公开(公告)号：US11278970B2

公开(公告)日：2022-03-22

申请号：US16594622

申请日：2019-10-07

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Alexander R. Greenhill ,  Brett A. Parendo ,  David Hlavac ,  WeiJie Wu ,  Gang Huang

IPC: B23B51/02

Abstract: A drill bit includes a body having a first end, a second end, and an axis of rotation extending centrally through the body from the first end to the second end. The drill bit also includes a shank adjacent the second end. The drill bit further includes a cutting head adjacent the first end. The cutting head includes a pilot tip and a cutting portion. The cutting portion has first tip surfaces and second tip surfaces on opposite sides of the pilot tip. Each first tip surface extends radially outward from the pilot tip to a corresponding second tip surface. The first tip surfaces define a first tip angle through the axis of rotation that is less than 180 degrees. The second tip surfaces define a second tip angle through the axis of rotation that is smaller than the first tip angle.

公开(公告)号：US20190329331A1

公开(公告)日：2019-10-31

申请号：US16387621

申请日：2019-04-18

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Brett A. Parendo ,  Richard Hohnl, JR. ,  David Hlavac ,  Alexander R. Greenhill ,  Ingolfur Ludviksson

IPC: B23B51/00

Abstract: A drill bit includes a shank extending along a bit axis and a body with a proximal end adjacent the shank and a distal end opposite the proximal end. The body defines a plurality of axially stacked, progressively sized steps including a first step at the distal end and a terminal step at the proximal end. The drill bit also includes a flute in the body. The flute defines an elongated groove that extends from the distal end to the proximal end. The drill bit further includes a plurality of cutting edges formed in the body. Each cutting edge is disposed along one of the plurality of steps and defines a helix angle and a rake angle. The helix angle of the cutting edge at the terminal step is greater than the helix angle of the cutting edge at the first step. A ratio of the helix angle to the rake angle of the cutting edge at the first step is in a range from 0.5 to 2.4, and a ratio of the helix angle to the rake angle of the cutting edge at the terminal step is in a range of 0.9 to 1.7.

公开(公告)号：US20210316375A1

公开(公告)日：2021-10-14

申请号：US17355500

申请日：2021-06-23

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Inventor： Brett A. Parendo ,  Richard Hohnl, JR. ,  David Hlavac ,  Alexander R. Greenhill ,  Ingolfur Ludviksson ,  Max R. Sawa ,  James E. Pangerc

IPC: B23B51/00

Abstract: A step drill bit includes a shank and a body having a proximal end adjacent the shank and a distal end opposite the proximal end. The body defines a plurality of axially stacked, progressively sized steps including a first step at the distal end, a terminal step at the proximal end, and a plurality of intermediate steps having incrementally increasing diameters disposed between the first and terminal steps. The step drill bit also includes a plurality of cutting edges each disposed along one of the plurality of steps. Each edge defines a helix angle and a radial rake angle. The radial rake angle and the helix angle of the cutting edge at the terminal step is greater than the radial rake angle and the helix angle of the cutting edge at the first step.

公开(公告)号：USD872783S1

公开(公告)日：2020-01-14

申请号：US29645681

申请日：2018-04-27

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

Designer： Brett A. Parendo ,  Richard Hohnl, Jr. ,  David Hlavac ,  Alexander R. Greenhill ,  Ingolfur Ludviksson

公开(公告)号：US12296395B2

公开(公告)日：2025-05-13

申请号：US17861599

申请日：2022-07-11

Applicant: MILWAUKEE ELECTRIC TOOL CORPORATION

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

IPC: B23B51/02 ,  B23P15/32

Abstract: A method of manufacturing a drill bit includes providing a piece of bar stock having a first end, a second end opposite the first end, and an axis of rotation extending centrally through the bar stock between the first and second ends, cutting the first end of the bar stock to form a first tip angle at an oblique angle measured through the axis of rotation, cutting the first end of the bar stock at a second tip angle measured through the axis of rotation to form first tip surfaces and second tip surfaces. The first tip surfaces have the first tip angle and the second tip surfaces have the second tip angle. The second tip angle is smaller than the first tip angle. Finally forming a flute in the bar stock between the first and second ends and forming a shank at the second end of the bar stock.