Drill bit
AssigneeMilwaukee Electric Tool Corporation
InventorsEdward S. Lau, Douglas W. Allen, Marc S. D'Antuono, Courtney McCool, Smith C. Theiler
Life of this patent
Estimating the term…
Abstract
A drill bit configured for use with a rotary power tool including a chuck. The drill bit includes a shank including a first end and a second end, and a paddle that extends from the second end of the shank. The paddle includes a first face including a concave portion, a second face opposite the first face and the second face including a convex portion opposite the concave portion, a cutting surface, a cutting edge located at an end of the cutting surface, a relief angle defined by the cutting surface, and an angled rake face adjacent the cutting surface that defines a rake angle that is between about 5 degrees and about 45 degrees.
Claims19
A drill bit configured for use with a rotary power tool including a chuck, the drill bit comprising:
- a shank including a first end and a second end, the first end configured to be received in the chuck of the rotatory power tool;
- and
- a paddle that extends from the second end of the shank, the paddle including,
- a first face including a concave portion,
- a second face opposite the first face and the second face including a convex portion opposite the concave portion,
- a cutting surface,
- a cutting edge located at an end of the cutting surface, a relief angle defined by the cutting surface, and
- an angled rake face adjacent the cutting surface that defines a rake angle that is between 5 degrees and 45 degrees,
- a spur adjacent the cutting surface,
- an inset surface disposed on the spur,
- a first side generally normal to the first face,
- a second side generally normal to the first face and opposite the first side, and wherein the first side includes a semi-circular recess between the second end of the shank and the cutting surface to reduce drag during a cutting operation.
A drill bit configured for use with a rotary power tool including a chuck, the drill bit comprising:
- a shank including a first end and a second end, the first end configured to be received in the chuck of the rotatory power tool;
- a rotational axis coaxially aligned with the shank and extending between the first end of the shank and the second end of the shank;
- and
- a paddle that extends from the second end of the shank, the paddle including,
- a first face,
- a second face opposite the first face,
- a cutting surface,
- a cutting edge located at an end of the cutting surface,
- a relief angle defined by the cutting surface,
- an angled rake face adjacent the cutting surface that defines a rake angle that is between 5 degrees and 45 degrees,
- a spur adjacent the cutting surface,
- a first side generally normal to the first face, and
- a second side generally normal to the first face and opposite the first side, and wherein the first side includes a semi-circular recess between the second end of the shank and the cutting surface to reduce drag during a cutting operation,
- an inset surface disposed on the spur, the inset surface is adjacent the first side and is angled inwardly toward the rotational axis such that a tip of the spur is radially inset relative to the first side.
Dependencies are inferred from the claim text.