Drill bit blade for masonry and rock drill

Details Drill bit blade for masonry and rock drill Drill bit blade for masonry and rock drill

1988-04-04

1991-01-15

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

175410, 408227, B23B 5100

Patent

active

049849441

ABSTRACT:
A drill bit blade for masonry and rock drills incudes first and second lateral side surfaces, first and second flank side surfaces, and converging first and second tip face surfaces. A first lateral cutting edge is defined by the intersection of the first tip face surface with the first lateral side surface, and a first lateral trailing edge is defined by the intersection of the first tip face surface with the second lateral side surface. A first lateral cutting edge is defined by the intersection of the first tip face surface with the second lateral side surface, and a second lateral trailing edge is defined by the intersection of the second tip face surface with the first lateral side surface. A chisel edge is defined at the converging intersection of the first and second tip face surfaces. A first notch is formed in the first lateral trailing edge and second lateral cutting edge at one end of the chisel edge, and a second notch is formed in the second lateral trailing edge and first lateral cutting edge at the other end of the chisel edge. In addition, notches are also formed in the first and second lateral cutting edges to divide the lateral cutting edges into cutting edge segments.

REFERENCES:
patent: 1069930 (1913-08-01), Down
patent: 2598459 (1952-05-01), Steffes
patent: 2673714 (1954-03-01), Hargrave
patent: 3460409 (1969-08-01), Stokey
patent: 4047826 (1977-09-01), Bennett
patent: 4356873 (1982-11-01), Dziak

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