Punch for making recessed screw

Details Punch for making recessed screw Punch for making recessed screw

1975-01-13

1976-08-03

Larson, Lowell A.

10 26, B23G 900, B21K 146

Patent

active

039720837

ABSTRACT:
A tapered punch for producing a recessed screw, the punch having an axially extending recess forming portion of symmetrical cross section and presenting in cross section 8 symmetrically disposed corners in 45.degree. spaced relation with any 4 alternate corners lying on the corners of one square and the remaining 4 alternate corners lying on the corners of another square in 45.degree. angular relation to the first mentioned square, and a method for cold forming the recess by evenly spreading flow of the metal.

REFERENCES:
patent: 1003657 (1911-09-01), Robertson
patent: 2914984 (1959-12-01), Ansingh
patent: 2977838 (1961-04-01), Oestereicher

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