Self-attaching female fastener elements and method of...

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 53/24 (2006.01) B21B 1/00 (2006.01) B21H 3/02 (2006.01) B21K 1/64 (2006.01) F16B 37/04 (2006.01)

Patent

CA 2502213

The method of forming self-attaching female fasteners (26) by rolling a continuous metal strip (20) including a central pilot portion (28) having parallel sides and flange portions (32) on opposed sides, severing at least the pilot portion (28) and cold forming the rectangular pilot portion (28) into a cylindrical end portion (38). Wing-shaped radial portions (40) are formed in the pilot portion (28) which may be severed or remain for anti- rotation features. The strip may remain continuous, wherein the severed pilot portions (28) are spread and the flange portions (32) are thinned or the strip may be severed into discreet fasteners. The female fasteners thus include generally cylindrical pilot portions (28) and rectangular flange portions (32) which may include rolled grooves.

La présente invention concerne la réalisation d'éléments de fixation femelle automatiques, par laminage d'une lame de métal continue comprenant une partie principale centrale présentant des côtés parallèles et des parties latérales disposées sur des côtés opposés, comprenant la séparation d'au moins la partie principale et le formage à froid de la partie principale rectangulaire pour obtenir une partie d'extrémité cylindrique. Des parties radiales en forme d'ailettes sont formées dans la partie principale et peuvent être séparées ou être conservées pour leurs propriétés anti-rotatives. La lame de métal peut conserver sa continuité, les parties principales séparées étant écartées et les parties latérales étant amincies, ou la lame de métal peut être séparée en éléments de fixation discrets. Les éléments de fixation femelle comprennent ainsi des parties principales généralement cylindriques et des parties latérales rectangulaires qui peuvent présenter des rainures laminées.

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