Threaded fastener recess forming punch

Details Threaded fastener recess forming punch Threaded fastener recess forming punch

1978-01-18

1978-11-28

Combs, E. M.

10 26, B23G 900, B21K 144

Patent

active

041269080

ABSTRACT:
A screw having a head and a threaded shank and, in the head, a cruciform shaped recess comprising a central cavity and four grooves radiating from the central cavity at 90.degree. angular spacings, the bases of the grooves lying on a conical (or pyramidal) surface and wherein the included angle at the vertex of such cone (or pyramid) has a value within the range 40.degree. - 45.degree., the preferred value being 40.degree..

REFERENCES:
patent: 2082085 (1937-06-01), Tomalis
patent: 2568439 (1951-09-01), Friedman
patent: 3108623 (1963-10-01), Muenchinger

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