Patent ID: 9404524
Filing Date: 2016-08-02
CPC Classification: F16B

Claim Text:
1. A thread rolling fastener, the fastener comprising: a thread profile being defined by three zones; wherein an outer zone profile is defined as having thread profile faces constructed as parabola; wherein a central zone is defined as having profile faces constructed as sides of a trapezium; wherein an inner zone is defined as having profile faces constructed as hyperbola; wherein the profile form being developed around a selected basic pitch diameter, the pitch diameter being a selected nominal basic pitch diameter to which is added a selected fundamental deviation, a height of the sides of the trapezium is spaced equally above and below the pitch diameter; wherein the outer zone parabola is constructed from the upper position of the central trapezium toward the major, outer, diameter of the screw/bolt thread, wherein at the outer diameter there is a tip width at which the parabola terminates, wherein the inner zone hyperbola is constructed from the inner position of the central trapezium and extends toward the minor thread diameter; and wherein the inner hyperbola extends to the centre between the threads at the point where it contacts the thread minor diameter.