Drill bit for drilling a hole in layered material of different h

Details Drill bit for drilling a hole in layered material of different h Drill bit for drilling a hole in layered material of different h

1989-05-30

1990-10-30

Bishop, Steven C.

Cutting by use of rotating axially moving tool

With means to apply transient, fluent medium to work or product

Including tool with duct

408 83, 408207, 408229, B23B 5106

Patent

active

049665030

ABSTRACT:
A drill bit for drilling a hole in layered material where the first layer encountered by the bit is softer than the second layer and where the second layer encountered by the bit produces chips capable of abrading the first layer. The drill bit comprises a solid shaft having a cutting tip, an internal bore for conducting flushing fluid to the tip and a flute for conveying the fluid and the chips away from the tip. A collar fixed to the outer surface of the shaft prevents the chips from contacting the bore drilled in the first layer.

REFERENCES:
patent: 111167 (1871-01-01), Bauman et al.
patent: 800894 (1905-10-01), Baldwin
patent: 2780947 (1957-02-01), Willingham
patent: 3304815 (1967-02-01), Faber
patent: 3701606 (1972-10-01), Bogsten
patent: 4268197 (1981-05-01), Burgsmuller
patent: 4605347 (1986-08-01), Jodock et al.

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