Emhart Inc.

Robert Volnhals

Dieter Mauer

Reinhold Opper

A punch rivet ( ) has a cutting edge ( ) which is arranged on the end face of its rivet shank ( ) and is formed in the cutting region by an outer face ( ) extending parallel to the axis and a conical inner face ( ) of the rivet shank ( ). The outer face ( ) extends continuously parallel to the axis over the entire rivet shank ( ) and the punch rivet ( ) is provided with the same cutting edges ( ) on either side in an axially symmetrical design in the form of a tube.

Punch rivet, riveted joints produced with it, riveting tool and method of producing a riveted joint

Electric welding device (5) for welding a fastening element (4), in particular a weld stud, on a workpiece with a stud holding means (1) comprising a conveying duct (2) which is connected at one end to a supply duct (3) and holds a fastening element (4) in its other end during the welding process and including a loading pin (6) which is displaceable to and fro along the axis of the longitudinal direction of the conveying duct. The pin has a shank part (13) and a head part (12) which can be brought to bear on a fastening element (4). At least the head part (12) of the loading pin (6) is an electrically insulating surface.

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Ingolstadt, Germany

Robert Volnhals