Twist drill

Details Twist drill Twist drill

1986-11-26

1988-07-12

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408227, B23B 5102

Patent

active

047566507

ABSTRACT:
A twist drill including a body characterized by the outer portion of each of the heels bulging toward the main flute as compared with that of the standard twist drill, the main lips each bulging in a triangular shape in cross section toward the main flute as compared with that of the standard twist drill, and a subflute having a substantially U-shaped cross section and axially formed in the inner portion adjacent to the axis of the twist drill of each of the heels along the main flute for a predetermined distance from the tip.

REFERENCES:
patent: 262588 (1882-08-01), Hartshorn
patent: 472541 (1892-04-01), Johnson
patent: 750537 (1904-01-01), Hanson
patent: 2778252 (1957-01-01), Oxford, Jr.
patent: 3667857 (1972-06-01), Shaver et al.
patent: 4222690 (1980-09-01), Hosoi
patent: 4605347 (1986-08-01), Jodock et al.
patent: 4688972 (1987-08-01), Kubota

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