Drill bit of the twist drill type

Details Drill bit of the twist drill type Drill bit of the twist drill type

1994-01-18

1995-01-10

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

408230, B23B 5102

Patent

active

053801334

ABSTRACT:
Drill bit of the twist drill type with turns which are held together by a drill center web and each issue in a radially extending cutting edge of which one extends to the bit axis and the other is shorter than it. This is characterized by the following features:

REFERENCES:
patent: 321144 (1885-06-01), Soderstrom
patent: 815247 (1906-03-01), Zangerle
patent: 4143723 (1979-03-01), Schmotzer
patent: 4620822 (1986-11-01), Hague

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