Head forming method

Details Head forming method Head forming method

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

Affiliated with

Also associated with

Rating

Head forming method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Head forming method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Head forming method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-568975