Twist drill with reverse flutes

Details Twist drill with reverse flutes Twist drill with reverse flutes

1996-04-02

1997-11-11

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

606 80, 606180, B23B 5102

Patent

active

056856733

ABSTRACT:
A twist drill comprising a shank section at a top of the drill and a body section at a bottom of the drill, the body section having two or more flutes which spiral downwardly in a first direction and terminate proximate a point, the drill having cutting lips formed by the flutes and operatively arranged to cut material when the drill is rotated in a second direction opposite that of the orientation of the spiral flutes.

REFERENCES:
patent: 3049018 (1962-08-01), Lusskin et al.
patent: 3577808 (1971-05-01), Visser
patent: 4111208 (1978-09-01), Leuenberger
patent: 4436091 (1984-03-01), Banko
patent: 4597697 (1986-07-01), Shaffer
patent: 4655650 (1987-04-01), Crawford et al.
patent: 5065647 (1991-11-01), Johnson
patent: 5078554 (1992-01-01), Kubota
patent: 5273380 (1993-12-01), Musacchia
patent: 5405155 (1995-04-01), Kanaan et al.

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