Pop Rivets: Hollow Rivet on a Break-Off Former Shank (Cherry 1939)

A rivet you set from one side. Cherry threaded a hollow rivet onto a shank with a bevelled head, the former, at the far end. Pull the shank while pushing on the rivet head and the former spreads the rivet's tail against the back of the work. A groove in the shank makes it break at a set pull, so every rivet is set to the same tightness. Source: Carl W. Cherry, US 2,183,543 (1939). Unknown: the metal and the dimensions. Cherry gives neither, so both are linked to unknown heads. Turning the parts on a lathe and setting them with a pop rivet gun are ours. Picture: the patent's drawing.