Black Decker Inc.

Abhijeet P Joshi

David N Johnson

Aland Santamarina

Michael P Peters

Rickey James Thomas

Francesco Butera

Thomas J Quinn

Florian Probst

Luca Fumagalli

Alfons K Wetzl

Albert Leidl

Hans Peter Paulus

Matthias Mertmann

A combination drill bit for use in both hand held drills and stationary drill presses has a shanking end, a working end and a helical flute portion between the shanking and working ends. The helical portion has a helix length (L) of The drill bit has a core that is tapered from the working end to the shanking end. A web thickness length at the working end is 10% to 35% of the diameter and the thickness length at the junction of the shanking end is 70% to 90% of the diameter. The drill bit is manufactured from a high speed steel including at least 5% by weight of cobalt.

Metal cutting drill bit

An impact resistant tool or tool bit holder has an active end for driving a fastener and a shanking end for securing to a power tool. The active end includes a body with a bore to receive the shank and a pocket to receive a damping mechanism. The shank includes an end to engage the bore in the body, and a pocket to receive the damping mechanism. The shank is received in the bore in the body for limited rotation with respect to the body. A damping mechanism is positioned in the pockets to provide damping between the body and the shank during torque loading.

Impact resistant tool bit and tool bit holder

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Baltimore, MD, United States of America

Abhijeet P Joshi