Patent ID: 9447807
Filing Date: 2016-09-20
CPC Classification: F16B,Y10T

Claim Text:
1. A fastener, for securing a workpiece comprising a plurality of workpiece members, said fastener comprising a shank with a head end and a tail end remote from the head end, and a radially enlarged head at the head end of the shank, and a fastener bore extending throughout the fastener, wherein an external wall of the shank comprises a voided section comprising a plurality of voids separated by a plurality of splines each of which culminates in a crest, the voids and splines being elongated in an axial direction with respect to a longitudinal axis of the fastener bore; wherein the splines are of an approximate trapezoidal cross-section, wherein the voids have a cross-sectional area which is constant along the length of the voided section of the fastener shank, and wherein the shank includes an unvoided solid tail ring between the voided section and the tail end of the shank, the unvoided solid tail ring having an external diameter approximately equal to the external diameter of the shank in the voided section.