Splined fastener
AssigneeInfastech Intellectual Properties Pte. Ltd.
InventorsAnthony Joseph Tyson, Roger Andrew Williams
Life of this patent
Estimating the term…
Abstract
A fastener (2) for securing a workpiece comprising a plurality of workpiece members, said fastener comprising a shank (4) and a radially enlarged head (6), wherein the fastener further comprises axial voids (40) and splines (18) provided on the internal wall of the bore of the fastener, such that when the fastener is installed into a workpiece by a mandrel, breakstem or pin, once the shank of the fastener has contacted with the walls of the workpiece apertures, the crests of the splines are deformed by the mandrel, breakstem or pin, and material of the crests is displaced into the voids.
Claims24
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 bore extending throughout the fastener;
- wherein an internal 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;
- and
- wherein the shank includes an unvoided solid tail ring between the voided section and the tail end of the fastener, the unvoided solid tail ring having an external diameter approximately equal to the external diameter of the shank in the voided section and an internal diameter approximately equal to a minor diameter of the voided section.
Fastening apparatus, for securing a workpiece comprising a plurality of workpiece members, said apparatus comprising a fastener and a mandrel;
- 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 bore extending throughout the fastener;
- wherein an internal 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;
- and
- wherein the shank includes an unvoided solid tail ring between the voided section and the tail end of the fastener, the unvoided solid tail ring having an external diameter approximately equal to the external diameter of the shank in the voided section and an internal diameter approximately equal to a minor diameter of the voided section.
Dependencies are inferred from the claim text.