Patent ID: 7293339
Filing Date: 2007-11-13
Classification: B21J,F16B,Y10T

Abstract:
1. A low swage load fastening system for a swage-type fastener structured to secure a plurality of workpieces together, said swage-type fastener including a pin member having an elongated pin shank adapted to be located in aligned openings in the workpieces, said pin member terminating at one end in an enlarged head adapted to engage a surface on one side of the workpieces and at its opposite end in a grooved portion adapted to extend past an opposite surface on the opposite side of the workpieces, said grooved portion comprising a locking portion having a plurality of lock grooves defined by circumferentially extending pin grooves and associated pin shoulders terminating in pin crests, said low swage load fastening system comprising: an installation tool including an anvil member with a swage cavity; and an as-headed collar including a generally straight collar shank adapted to be swaged into said lock grooves on said pin member in response to a relative axial force or swage load applied between said pin member and said as-headed collar by said installation tool, thereby providing a desired magnitude of clamp load on the workpieces which are fastened together to define a fastened joint, said swage cavity of said installation tool being structured to engage said collar shank and to swage it radially inward, said as-headed collar when swaged, having collar grooves and shoulders interlocking said pin grooves and shoulders, said pin member and said as-headed collar being of different materials having ultimate shear stresses of different magnitudes in order that yielding of said pin member is substantially avoided upon swaging said collar to said pin member, wherein said as-headed collar does not require thermal processing, and the generally straight collar shank of said as-headed collar has a wall thickness which is relatively thin thereby reducing the swage load required to swage said as-headed collar, and wherein said as-headed collar has an outer diameter and an inner diameter; and wherein the ratio of the outer diameter to the inner diameter of the collar is between about 1.47 to 1.55.