F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/139
F16B 19/05 (2006.01)
Patent
CA 1255127
ABSTRACT OF THE DISCLOSURE An optimized two piece fastener system and a related method for providing an optimized fastening system including a pin member and a collar having an optimized strength to weight ratio with the materials of the pin member and collar having a predetermined tensile strength ratio. The smooth shank portion of the pin is of a diameter sufficient to provide the necessary shear strength to accept the design shear load. The swaged collar has collar grooves and shoulders interlocking the pin grooves and shoulders, the pin member and the collar being of different materials having ultimate shear stresses of different magnitudes with the ratio of the shear stresses of the pin member to the collar being such that crushing of the pin member in swage is substantially avoided. The axial widths of the pin grooves and shoulders and the collar grooves and shoulders are preselected in accordance with the relative shear strengths of the different materials so that the pin shoulders and the collar shoulders are adapted to fail in shear generally at the design tensile load applied between the pin member and the collar. The collar has a minimum wall thickness and hence weight, such that after swage compressive yielding could occur generally at the design tensile load. The collar is swaged into the pin grooves via a swage anvil having an effective throat swage portion. The collar has a predetermined volume of material which is generally at least around 20% greater than the available volume defined by the effective throat swage portion and the confronting portion of the pin grooves into which the collar is swaged. In one embodiment the pin member prior to swage has a pintail portion connected with the grooved portion by a breakneck groove, the pintail portion being adapted to be gripped by a tool actuable for applying a relative axial force between the pin member and the collar. The breakneck groove is adapted to accept a combined tensile and bending load and to fracture at a preselected axial force after completion of swaging. The breakneck groove has a stress concentration factor provided for fracture at the preselected axial force and further providing for fracture within around 12% from the preselected axial force when the fastener is applied to workpieces having its collar engaging surface at an angle of 7° normal to the axis of the pin member.
399951
Dixon Richard D.
Ruhl John H.
Huck Manufacturing Company
Macrae & Co.
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