Cutting by use of rotating axially moving tool – Tool or tool with support – Having inversely angled cutting edge
Patent
1975-10-20
1977-04-12
Britts, Ramon S.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having inversely angled cutting edge
10 10R, 408228, F16B 2500
Patent
active
040167950
ABSTRACT:
A self-drilling and self-tapping fastener, particularly suitable for use in relatively thick metal, which is made from a headed blank by a method including pressing into the cylindrical free end of the blank a pair of straight flutes, by dies which are closed together on a line which is acutely angled to both the leading and trailing walls of the flutes. The flutes are inclined in opposite directions relative to the screw axis and are positioned on opposite sides of the screw. The tip is machined off to a V-form, to provide a ridge angularly advanced about the axis of the screw relative to the cutting edges of the flutes. Further machining may remove metal from the sides of the drill point between the flutes to provide flats and the drill point may be turned to a circular cross-section to provide sharp well-supported cutting edges for improved wear resistance. The drill point may taper overall, being of smallest diameter adjacent the threaded fastener shank.
REFERENCES:
patent: 2507882 (1950-05-01), Berman
patent: 3125923 (1964-03-01), Hanneman
patent: 3318182 (1967-05-01), Carlson
patent: 3517542 (1970-06-01), Skierski
patent: 3517581 (1970-06-01), Stokes et al.
Britts Ramon S.
GKN Screws & Fasteners Limited
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