Spade-type drill bit having helical configuration

Details Spade-type drill bit having helical configuration Spade-type drill bit having helical configuration

2006-11-28

2006-11-28

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

C408S225000, C408S213000

Reexamination Certificate

active

07140814

ABSTRACT:
A spade bit including a longitudinally extending shaft having a cutting member located at a distal end thereof. The cutting member comprises a pair of helically shaped, opposed blades joined along the longitudinal axis of the shaft and an axially extending pilot spur. The pilot spur defines a pair of cutting edges, and each of the blades defines a forward cutting edge joined with a respective cutting edge of the pilot spur.

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