Dies for forming drilling screws
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United States of America Patent
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Jul 7, 1987
Issued Date -
N/A
app pub date -
Mar 7, 1986
filing date -
Jan 12, 1981
priority date (Note) -
Expired
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Abstract
Dies for manufacturing drilling screws and drill sections thereof comprise respectively a cavity formed by all flat faces, two straight longitudinal parallel side edges and two straight oblique front edges formed at the same height as the side edges on the top portion, a top flat elongate face adjacent to the cavity and between one of the side edges and the cavity, inclined faces adjacent to all said edges, and a top flat base face positioned on the same height as the top elongate face and the parallel side edges. The two parallel side edges form cutting edges on flat vertical walls of the drill section of the screw, and the cavities form protruding blocks formed respectively by three flat inclined faces and a relief face. A method of manufacturing a drill section of a drilling screw comprises providing a pair of dies having cavities formed by all flat faces, and being symmetrical, positioning a workpiece between the pair of dies, and closing the pair of dies to form a drill section of a drilling screw therebetween.
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