Swage type fastener with low swage load

F - Mech Eng,Light,Heat,Weapons – 16 – B

Patent

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F16B 19/05 (2006.01) B21J 15/02 (2006.01)

Patent

CA 2412770

A two piece fastener system for including a pin member (12) and a collar (14) having an optimized strenght with the materials of the pin member (12) and collar (14) having a predetermined shear strength ratio; the collar (14) has a preselected excess volume to provide a desired 'overpacking' condition and is of a size whereby after swage it will define a minimum wall thickness; the collar (14) has an outer surface (70) with a contour which in combination with a preselected excess volume results in a reduction in load required to swage the collar (14) and with a pull type fastener providing a breakneck groove (38) of reduced strength whereby severance of the pintail (40) will occur at a reduced load resulting in a reduction in shock or ghost load applied to workpieces including those of a plastic or composite material.

Système de fixation en deux pièces comprenant une goupille (12) et un collier (14) dont la force est optimisée par un rapport de force de cisaillement prédéterminé des matériaux de la goupille (12) et du collier (14). Ce collier (14) présente un dépassement de volume présélectionné, ce qui produit un état désiré de surdimensionnement, de façon à définir une épaisseur de paroi minimum après le matriçage. Ce collier (14) possède une surface extérieure (70) dont un profil combiné à un dépassement de volume présélectionné permet de diminuer la charge nécessaire pour matricer le collier (14) et qui comporte un élément de fixation de type traction produisant une gorge de rupture (38) de force limitée, ce qui permet au sectionnement de la queue de goupille (40) de s'effectuer à une charge réduite, et d'obtenir une diminution du choc ou de la charge fantôme appliqués à des pièces, y compris des pièces en plastique ou en matériau composite.

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