Fastener construction

Claim 1

A FASTENER CONSTRUCTION ADAPTED TO BE DRIVEN THROUGH AN IMPERFORATE PORTION OF A WORKPIECE BY A POWER ACTUATED DRIVING MEMBER AND ADAPTED TO BE CLINCHED DURING SAID DRIVING OPERATION COMPRISING A FASTENER HAVING BOTH A CROWN PORTION ADAPTED TO BE ENGAGED BY THE DRIVING MEMBER AND A PAIR OF ELONGATED LEGS THAT ARE TO BE DEFLECTED RELATIVE TO EACH OTHER WHEN THE FASTENER IS CLINCHED, EACH OF SAID LEGS HAVING A LONGITUDINAL AXIS AND TERMINATING IN A FREE END, AND A BLUNT POINT STRUCTURE FORMED IN THE FREE END OF EACH OF SAID LEGS, THE TERMINUS OF EACH OF SAID BLUNT POINT STRUCTURES BEING DEFINED BY A FIRST PLANAR SEMICIRCULAR SURFACE, EACH OF SAID POINT STRUCTURES INCLUDING A SECOND GENERALLY PARALLEL AND SEMICIRCULAR SURFACE FORMED IN EACH LEG SPACED LONGITUDINALLY ALONG SAID AXIS FROM SAID FIRST SURFACE, SAID LEG BETWEEN SAID FIRST AND SECOND SURFACES OF EACH LEG BEING DEFINED BY AN AXIALLY EXTENDING PLANAR SURFACE PERPENDICULAR TO SAID FIRST AND SECOND SURFACES, SAID SEMICIRCULAR SURFACES EXTENDING GENERALLY PERPENDICULAR TO SAID AXIS AND BEING SPACED FROM EACH OTHER A DISTANCE SUBSTANTIALLY EQUAL TO THE RADIUS OF ONE OF THE SEMICIRCULAR SURFACES.