Methods and apparatus for making screws having a drill section a

Details Methods and apparatus for making screws having a drill section a Methods and apparatus for making screws having a drill section a

1986-06-23

1988-02-02

Combs, E. Michael

10 10R, B21H 302, B23G 900

Patent

active

047221070

ABSTRACT:
Method and apparatus for making screw having a drill section and a reamer section, the drill section and the reamer section being shaped at one step of the process, wherein the upper portions of the reamer edges are crushed so as to be aligned with an equal thickness and length, thereby imparting equal fragility to the reamer edges.

REFERENCES:
patent: 1913143 (1933-06-01), Robertson
patent: 3395603 (1968-08-01), Skierski
patent: 3747143 (1973-07-01), Eager
patent: 3827331 (1974-08-01), Muenchinger
patent: 4147088 (1979-04-01), Whittaker
patent: 4347027 (1982-08-01), Brindle
patent: 4407620 (1983-10-01), Shinjo

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