Spade bit with fluted shoulders

Details Spade bit with fluted shoulders Spade bit with fluted shoulders

1986-01-24

1987-07-28

Bilinsky, Z. R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

408225, 408229, B23B 5100

Patent

active

046829172

ABSTRACT:
The cutting rate of a spade bit is greatly improved by the provision of radial flutes on the lateral shoulders of the bit, extending transversely to the bit axis. Further improvements are obtained if the shoulder flutes are stopped by spurs positioned at the outer ends of the shoulders.

REFERENCES:
patent: 2600286 (1952-06-01), Weiland
patent: 2613710 (1952-10-01), Emmons
patent: 2627292 (1953-02-01), Kronwall
patent: 2782824 (1957-02-01), Robinson
patent: 3920350 (1975-11-01), Southall et al.
patent: 3966350 (1976-06-01), Benjamin
patent: 4120601 (1978-10-01), Benjamin

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