Drill screw and die for producing same

Details Drill screw and die for producing same Drill screw and die for producing same

1977-08-22

1979-01-30

Bonck, Rodney H.

10 9, 10 10R, F16B 2500

Patent

active

041365976

ABSTRACT:
A drill screw is produced by a pinch pointing die comprising a pair of substantially identical drill point forming portions each of which includes a half conical recess, a half cylindrical recess and a half truncated conical recess. The drill screw thus produced comprises, therefore, substantially identical two half drill point portions each of which includes a half conical portion, a half cylindrical portion and a half truncated conical portion.

REFERENCES:
patent: 2572647 (1951-10-01), Merwin
patent: 2956470 (1960-10-01), Knohl
patent: 3079831 (1963-03-01), Gutshall
patent: 3207024 (1965-09-01), Sommer
patent: 3463045 (1969-08-01), Prescott
patent: 3710676 (1973-01-01), Ringland
patent: 3937120 (1976-02-01), Munse

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