Locking drive-pin plastic rivet

Abstract From the Canadian patent

Abstract A plastic fastener, for example, a one-piece plastic rivet having a head and a bifurcated oval shank and expander means capable of axial movement within a tapered bore traversing the head and shank. Each portion of the shank has a longitudinally disposed radial relief means that provides a buckle or hinge section having generally uniform radial thickness which opens into the tapered bore to provide pairs of edges falling on the surface of the bore which, when the edges are contacted by the expander means, may cause the shank portions to be moved radially and to be expanded circumferentially as well. Positive locking means are also provided for restricting movement of the expander …