Spade bits with angled sides

Details Spade bits with angled sides Spade bits with angled sides

2005-10-25

2005-10-25

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

C408S213000, C408S225000, C408S228000

Reexamination Certificate

active

06957937

ABSTRACT:
A spade drill bit has a shaft and a spade head portion arranged on the shaft. The head portion has a rearward facing bottom edge, two longitudinal sides and a forward facing cutting edge. The cutting edge has a pointed, generally triangularly shaped tip and outer ends. The longitudinal sides of the head portion are bent along a bend in a direction of rotation of the drill bit during operation, so that the outer ends are bent forwards in the rotating direction. The bend runs from a first position at one of the longitudinal sides, closer to the bottom edge than to the cutting edge, and to a second position at the cutting edge between the outer end and the tip.

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Turbo Bit advertisement, Kennametal, 2000.

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