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US 2020/0222994 A1Published application
Step drill bit
AssigneeMilwaukee Electric Tool Corporation
InventorsDouglas W. Allen, Courtney D. McCool, Smith C. Theiler, Richard Hohnl, JR.
Life of this patent
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Abstract
A drill bit includes a shank and a body portion defining a plurality of axially stacked, progressively sized steps. The steps include a first step and a terminal step. The first step defines two tip flutes each disposed at a tip flute angle. The body portion defines a body flute extending through the steps. The drill bit also includes an indicator band formed on a portion of the body flute and a portion of an outer surface of one of the plurality of steps.
Claims21
(canceled)
A drill bit comprising:
- a shank extending along a bit axis;
- a transition portion coupled to the shank;
- a body portion having a distal end and defining a plurality of axially stacked, progressively sized steps including a first step at the distal end and a terminal step coupled to the transition portion, each step including an axial relief formed on an upper edge of the step, the body portion further defining a body flute extending from the first step to the transition portion;
- and
- wherein a difference in hole diameters formed by each pair of adjacent steps of the plurality of steps is less than 0.1 inches.
2 more elements
A drill bit comprising:
- a shank extending along a bit axis;
- a body portion coupled to the shank, the body portion having a distal end and defining a plurality of axially stacked, progressively sized steps including a first step at the distal end and a terminal step nearer the shank than the first step, each step including an axial relief formed on an upper edge of the step, the body portion further defining a body flute extending from the first step to the terminal step;
- and
- wherein a difference in hole diameters formed by each pair of adjacent steps of the plurality of steps is less than 0.1 inches.
1 more element
Dependencies are inferred from the claim text.