Asymmetrical drill bit

Details Asymmetrical drill bit Asymmetrical drill bit

1983-06-20

1986-02-04

Briggs, William R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

408227, B23B 5100

Patent

active

045682275

ABSTRACT:
An asymmetrical drill bit. A masonry-type bit having diametrically opposed, oppositely inclined top walls converging at an apex and having upstanding sidewalls is broken so that diametrically opposed, hollow ground, dished surfaces are formed such that the respective lengths of the top and sidewalls are diminished. The dished portions so formed are asymmetrical to the axis of rotation of the bit, and the structure exhibits a durability that substantially exceeds the durability of symmetrically ground bits.

REFERENCES:
patent: 2276532 (1942-03-01), Welty
patent: 2576664 (1951-11-01), Berlien
patent: 3014386 (1961-12-01), Kallio
patent: 3138043 (1964-06-01), Greuner
patent: 4047826 (1977-09-01), Bennett
patent: 4143723 (1979-03-01), Schmotzer
patent: 4400119 (1983-08-01), Clement

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