Step drill bit
AssigneeMilwaukee Electric Tool Corporation
InventorsDouglas W. Allen, Courtney D. McCool, Smith C. Theiler, Richard Hohnl, Jr.
Life of this patent
Estimating the term…
Abstract
A drill bit includes a shank, a transition portion, and a body portion defining a plurality of axially stacked, progressively sized steps. The steps include a first step and a terminal step coupled to the transition portion. The first step defines two tip flutes each disposed at a tip flute angle. The body portion defines a body flute extending from the first step to the transition portion. 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.
Claims18
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, the body portion further defining a body flute extending from the first step to the transition portion;
- a first indicator band formed on a portion of the body flute and a portion of an outer surface of one of the plurality of steps;
- and
- a second indicator band formed on another portion of the body flute and a portion of an outer surface of another one of the plurality of steps that is non-adjacent the one of the plurality of steps;
- wherein at least one step of the body portion positioned between the one of the plurality of steps having the first indicator band and the another one of the plurality of steps having the second indicator band is without an indicator band.
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, the body portion further defining a body flute having a flute surface extending from the first step to the transition portion;
- and
- indicia on the flute surface, the indicia corresponding to axial depths of the plurality of steps, wherein less than half of the indicia include markings to differentiate the corresponding indicia from the other indicia.
Dependencies are inferred from the claim text.