Non-blind rivet

A non-blind rivet, adapted to be set by compressive forces, comprising

• a rivet body having an axis and a tubular wall around an axial bore which extends from a tail end portion to a head end portion of the rivet,
• a head flange at the head end portion of the rivet extending outwardly from the body,
• characterized in that the axial bore comprises:
• three portions of different diameters;
• a first cylindrical portion of the bore at a first diameter extending from the tail end portion;
• a second cylindrical portion of the bore at a second diameter less than the first diameter extending from the head end portion;
• an intermediate cylindrical portion of the bore extending between the first and second portions thereof at a diameter less than the second diameter;
• and
• a surface formed at an inboard end of the second portion of the bore which is generally perpendicular to the axis of the bore and which defines a planar cross section of the tubular body whereat an inboard end of an ultimately deformable section of the tubular body is located.

A non-blind rivet, adapted to be set by compressive forces for securance to a workpiece of a first prescribed thickness, comprising

• a rivet body having a tubular wall around an axial bore which extends from a tail end portion to a head end portion of the rivet,
• a head flange of a second prescribed thickness at the head end portion of the rivet extending outwardly from the body,
• characterized in that the axial bore comprises:
• at least two portions of different diameters;
• a first cylindrical portion of the bore at a first diameter extending axially inward from the tail end portion;
• a second cylindrical portion of the bore at a second diameter less than the first diameter extending axially inward from the head end portion;
• the head flange formed with an inboard side which is located for engagement with the workpiece upon assembly therewith such that the head flange when assembled with the workpiece will form a combined thickness generally equal to the sum of the first and second prescribed thicknesses;
• the second portion of the bore extending a prescribed axial length which is greater than the combined thickness;
• a wall section of the tubular body formed adjacent the second portion of the bore extending axially inward the prescribed axial length from an axially outboard end of the second portion and formed with a prescribed wall thickness;
• the wall section formed with a first segment extending axially inward from the outboard end of the second portion of the bore for a distance equal to the combined thickness;
• the wall section formed with a second segment extending axially inward from, and integrally formed with, the first segment thereof for an axial distance equal to the difference between the prescribed axial length of the second portion of the bore and the combined thickness;
• and
• the axial length of the second segment, and the prescribed wall thickness, of the wall section being sufficient to allow the wall section to buckle laterally outward upon the application of opposing axial pressure to the head end portion and the tail end portion.