1975-11-07
1977-07-05
Combs, E. M.
10 7, 10 26, 10 27R, 85 45, B23G 900, B21K 146
Patent
active
040330036
ABSTRACT:
A method of providing an undercut "bowtie" slot in the head of a fastener such as a screw or bolt, and the resulting interim and final fastener products. The method consists of only two heading steps, starting with either a preform or a simple blank. In the first heading step a forming blow is applied which produces a "bowtie" shaped slot having side walls that are not undercut and a single, continuous ellipsoidal bulge projecting upwardly from the head adjacent to and substantially coextensive with each edge of the slot. In the second heading step a forming blow is applied which compresses the material of the ellipsoidal bulges down into the head to form a radiused undercut slot configuration that is continuous and substantially coextensive with the length of the slot.
REFERENCES:
patent: 2182092 (1939-12-01), O'Leary
patent: 2304704 (1942-12-01), O'Leary
patent: 2676510 (1954-04-01), Hodell
patent: 2953794 (1960-09-01), Klooz
patent: 2954719 (1960-10-01), Vaughn
patent: 3540342 (1970-11-01), Vaughn
Briles Manufacturing
Combs E. M.
Gabriel Albert L.
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