Self-attaching female fasteners, method for forming same and...

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 53/24 (2006.01) B21J 13/02 (2006.01) B21K 1/44 (2006.01) B21K 1/64 (2006.01) F16B 37/04 (2006.01)

Patent

CA 2626561

A method of forming pierce and clinch nuts (74,174,274) by rolling a section (20) having the desired cross-section, punching equally spaced bores (50) through the central pilot portion (22) and then punching configured openings (56) through the central pilot portion (22) having convex arcuate surfaces (72) and eliminating sharp corners. The strip of interconnected self-attaching fasteners (82) may be installed directly from the strip (82) in a panel, fed in bulk or separate fasteners interconnected by frangible connectors (70). The resultant self-attaching nut (74,174,274) includes a central pilot portion (22) having a bore (50) through the top face (24), integral flange portions (26) extending from opposed sides and the pilot portion (22) includes convex arcuate faces (72) reducing or eliminating stress cracking and propagation of stress cracks.

La présente invention concerne un procédé permettant de former des écrous autopoinçonneurs et des écrous-rivets par laminage d~une section possédant la section transversale désirée, par perforation d~alésages espacés à intervalles réguliers à travers la partie pilote centrale, puis par perforation d~ouvertures configurées à travers la partie pilote centrale possédant des surfaces arquées convexes et par élimination des angles pointus. La bande d~éléments de fixation autofixants interconnectés peut être installée directement à partir de la bande dans un panneau, alimentée en vrac ou peut séparer des éléments de fixation interconnectés par des raccords cassants. L~écrou autofixant ainsi obtenu comprend une partie pilote centrale possédant un alésage traversant la face supérieure, des parties rebord intégrées s~étendant depuis les côtés opposés, et la partie pilote comprend des faces arquées convexes réduisant ou éliminant les fissurations sous contrainte et la propagation de fissures sous contrainte.

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