Importance

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Abstract

An assembly unit includes an assembly element having a wall bounding a through hole thereof; and a counterpart back engagement part protruding radially inwardly from the wall and into the through hole. The assembly unit further includes a fastening element to be inserted into the through hole for assuming an initial position and a final assembly position therein, having a head for actuating a fastening of the fastening element; a shaft disposed adjacent the head for resting with radial play in the through hole, the shaft resting entirely in the through hole in the final assembly position of the fastening element; and a back engagement part disposed on the shaft and having a cross section in a plane perpendicular to a longitudinal axis of the shaft which protrudes beyond a cross section of the shaft in the plane. The shaft defines an undercut region between the head and the back engagement part. When the shaft rests in the through hole, the counterpart back engagement protrudes toward the undercut region and cooperates with the back engagement part to captively retain the fastening element in the through hole. The undercut region defines a constriction therein positioned such that, in the final assembly position of the fastening element, the constriction is disposed, in a radial direction, adjacent the counterpart back engagement part.

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First Claim