Drill bit

Details Drill bit Drill bit

1978-03-10

1980-09-30

Vlachos, Leonidas

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408199, 407 61, 144219, B23B 5108, B23B 5110

Patent

active

042252750

ABSTRACT:
A drill bit comprising a shank having three cutting blades extending radially therefrom with the longitudinal cutting edges of the blades defining a right circular cylinder coaxial with the axis of the shank. At the working end of the shank a countersink cutting point is formed by the cutting edges of the blades sloping together to a common point on the axis of the shank and defining a right circular cone.

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patent: 2482535 (1949-09-01), Bayless
patent: 2640379 (1953-06-01), Graves
patent: 2715772 (1955-08-01), Fritz
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patent: 2795979 (1957-06-01), Zerwick
patent: 3564945 (1971-02-01), Bradley
patent: 3997279 (1976-12-01), Porter

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