Cutting by use of rotating axially moving tool – Tool or tool with support – Having inversely angled cutting edge
Patent
1978-07-17
1980-03-11
Britts, Ramon S.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having inversely angled cutting edge
408228, F16B 2500
Patent
active
041922174
ABSTRACT:
A self-drilling screw having an elongated threaded shank with a driving head at one end and a drilling body portion at its other end formed with longitudinally extending flutes located substantially on opposite sides of the body, these flutes defining rectilinear tip and side cutting edges positioned along opposite sides of the body, the tip-cutting edges being forwardly offset and angularly diverging from the ends of a transverse cutting edge, formed on a tip web, to diametral opposite points on the body providing a transverse width at least equal to the root diameter of the threads on the shank, and at which points the tip-cutting edges connect with the side-cutting edges which are angularly inclined towards their outer ends in a rearward direction circumferentially of the body. Narrow inwardly inclined relief planar surfaces parallel the respective cutting edges, and are augmented by a plurality of additional contiguous back relief planar surfaces of greater angular inclination than the relief surfaces extending immediately along the cutting edges. One of the walls of each flute adjacent each end of the transverse cutting edge of the tip web is notched to provide salient cutting edge portions at the ends of the tip web, these salient cutting edges being so conformed as to effect a clawing cutting action.
REFERENCES:
patent: 2401307 (1946-06-01), Manewich
patent: 2889725 (1959-06-01), Turton et al.
patent: 3085453 (1963-04-01), Mossberg
patent: 3395603 (1968-08-01), Skierski
patent: 4125050 (1978-11-01), Schwartzman et al.
Britts Ramon S.
J. Schwartzman Manufacturing & Supply Co.
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