Drill bit

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United States of America Patent

PATENT NO 8801344
APP PUB NO 20120076597A1
SERIAL NO

13376376

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Abstract

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The invention proposes a drill bit (1) leaving at least one main cutting edge (3, 3′) and at least one center cutting edge (15, 15′), wherein the drill bit (1) comprises a longitudinal axis (13), and wherein the at least one main cutting edge (3, 3′) and the at least one center cutting edge (15, 15′) are each assigned a rake face (7, 7′, 11, 11′). The drill bit (1) is characterized in that the rake face (11, 11′) assigned to the at least one center cutting edge (15, 15′) has at least two part faces (19, 19′; 21, 21′) which—as seen as perpendicular to the longitudinal axis (13) of the drill bit (1)—form an obtuse angle with one another, so that the at least one center cutting edge (15, 15′) comprises at least two part cutting edges (23, 23′; 25, 25′).

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Patent Owner(s)

Patent OwnerAddress
MAPAL FABRIK FUR PRAZISIONSWERKZEUGE DR KRESS KGD-73431 AALEN

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Krenzer, Ulrich Zirndorf, DE 25 384
Marz, Peter Dietenheim, DE 2 51

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