US Patent 8936420 Collapsible retainer

A press-in fastener adapted to join a first component to a second component. The fastener includes a proximal head and a distal base clip portion below the head. The base clip portion includes an axially displaceable post structure and a pair of opposing wings extending in upwardly angled relation away from the travel path defined by the post structure. Collapsible legs engage the wings in operative connection to the post structure. As the fastener is pressed inwardly, upon encountering resistance from the second component, the legs collapse in folded relation as the post structure travels axially between the wings.